Browsing by Author "Garg, V.K."

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Application of EDTA modified Fe3O4/sawdust carbon nanocomposites to ameliorate methylene blue and brilliant green dye laden water
(Academic Press, 2019) Kataria, N; Garg, V.K.
This work explored the potential of magnetic sawdust carbon nanocomposites for cationic dyes removal from aqueous medium. EDTA modified magnetic sawdust carbon nanocomposites (EDTA@Fe3O4/SC ncs) were prepared by biogenic green reduction and precipitation approach. The surface properties, structure and composition of nanocomposites were characterized by HRTEM, FESEM, XRD, EDX, BET, FTIR etc. The Fe3O4 nanoparticles were 10–20 nm in diameters and having 14 m2/g surface area. Removal of Methylene blue (MB) and Brilliant green (BG) dyes from aqueous medium was studied in batch mode experiments. The maximum removal was achieved at neutral pH 7.0 with in 30 min. Adsorption capacity of EDTA@Fe3O4/SC for MB and BG dyes was 227.3 mg/g and 285.7 mg/g, respectively. Dye adsorption behaviour is well explained by Freundlich model. The rate of cationic dye adsorption is explained by pseudo-second order model. The value of thermodynamic parameters confirmed that adsorption process was spontaneous and favourable. Desorption and reusable efficiency of nanocomposites was also evaluated. © 2019 Elsevier Inc.
Assessment of bio-concentration factor of heavy metals in Indian soil-crop system
(Scientific Publishers, 2017) Yadav, P.; Garg, V.K.; Singh, B.; Mor, S.
Bioaccumulation of heavy metals in different agricultural products in soil-crop systems has fascinated pervasive attention in yester years due to food safety issues. The objectives of this study were to determine the influence of different soil parameters on bio-concentration of heavy metals? from soil to pearl millet grains. For the purpose, heavy metals were quantified in pearl millet grains and corresponding fields? rhizospheric soil samples from different study sites in Haryana, India. The mean concentrations of Cd, Pb, Ni, Zn, Fe and Cu in pearl miller garins were found to be 0.50, 6.74, 3.86, 49.72, 142.0 and 10.17 mg kg?1 respectively. Pearl millet showed capacity to transfer essential metals Zn and Cu from soil to grains while showed a restricting effect to the uptake of Co and Cr. Further multivariate statistical techniques like correlation analysis, principal component analysis and cluster analysis were applied to the data for supplementary and qualitative evaluation of inter-dependences among the studied parameters. Bio-concentration factors of all the studied heavy metals in pearl millet grains showed significant negative correlations with their respective soils? total metal concentrations. The results revealed lesser metal uptake with increasing soil total metal concentrations. Inspite of the variability in the characteristic of investigated soils, significant correlations among soil quality parameters and metal accumulation in grains were recorded. Cluster analysis revealed formation of many primary cluster pairs such as EC-Na, CEC-Ca, BCFNi-Cus, BCFFe-TOC, BCFzn-EC, BCFPb-pH, BCFCu-Na and CdS-Pbs etc. ? 2017, Scientific Publishers. All rights reserved.
Assessment of uranium concentration in the drinking water and associated health risks in Eastern Haryana, India
(Taylor and Francis Inc., 2018) Daulta, R.; Singh, B.; Kataria, N.; Garg, V.K.
Quantification of uranium in drinking water has great significance considering its effects on human health. Drinking water samples collected from different sources, viz., hand pumps, tube-wells, and public water supply from Sonipat and Panipat districts of Haryana, India have been analyzed for uranium and other physico-chemical parameters. Uranium concentration in water samples was measured using Pulsed LED Fluorimeter. Uranium concentration in collected water samples ranges from 9.1 to 155.1 ?g/L in Sonipat district and 14.9 to 123.3 ?g/L in Panipat district. It was inferred from the data that uranium concentration in some water samples was higher than WHO & USEPA recommended limit of 30 ?g/L. The mean cancer risk due to uranium in drinking water in Sonipat and Panipat districts was found to be 1.40 ? 10?4 and 1.63 ? 10?4, respectively, which is lower than the maximum permissible limit (<10?3). Total Dissolve Salts (TDS) in water samples of some villages in Sonipat district was higher than permissible limits for drinking prescribed by WHO & BIS. ? 2018 Taylor & Francis Group, LLC.
Bioaccumulation and health risks of heavy metals associated with consumption of rice grains from croplands in Northern India
(Taylor and Francis Inc., 2017) Yadav, P.; Singh, B.; Garg, V.K.; Mor, S.; Pulhani, V.
The present study focused on micronutrients and nonessential toxic heavy metals quantification and their bio-concentration in soil?rice system in Haryana, India. Composite samples of rice grains and paddy fields' soil were collected, processed and analyzed for heavy metals. Nutrient and heavy metals' content of paddy fields' soil varied over a wide range, having highest Fe content followed by Cu > Cr > Pb > Ni > Zn > Co > Cd. Most of the metals viz. Fe, Zn, Cu and Co found profusely in rice grains were essential micronutrients. Bio-concentration factors (BCFs) in rice grains were in the following order: Zn (0.11) > Co (0.10) > Cu (0.08) = Cr (0.08) > Ni (0.02) > Pb (0.011) > Cd (0.009) > Fe (0.003), indicating higher accumulation of micronutrients than non-essential toxic heavy metals. Principal component analysis revealed three factors accounting for 70% of the total variance which supported correlation among electrical conductivity (EC)-Na, EC-cation exchange capacity (CEC), CEC-Na, pH-TOC, and BCFCu-BCFZn. Health risk indices anticipated that the grains are safe for consumption as non-carcinogenic hazard quotients were less than unity for all the studied heavy metals. ? 2017 Taylor & Francis Group, LLC.
Biotransformation of bakery industry sludge into valuable product using vermicomposting
(Elsevier, 2019) Yadav, A; Garg, V.K.
The aim of present work was to evaluate periodic changes in bakery industry sludge during vermicomposting. Six different blends of cow dung (CD) and bakery industry sludge (BIS) containing 10 to 50% of BIS were assessed in this study. Changes in physico-chemical parameters were evaluated at 21 days interval up to 105 days. Earthworms significantly increased NPK content and EC, while decreased pH, TOC and C: N ratio of BIS. After vermicomposting, TKN, TAP and TK contents increased 2.0–3.5, 1.2–1.9 and 1.2–1.4 times, respectively as compared to initial blends. A significant reduction (65.4–83.5%) in C: N ratio was observed in all blends. The concentrations of metals were found to be higher in the vermicomposts as compared initial blends. It was inferred that bakery industry sludge spiked with cow dung can be biotransformed into valuable manure employing earthworms. © 2018 Elsevier Ltd
Cadmium removal from water by green synthesized nanobioadsorbent [SiO2@DOPP]: Mechanism, isotherms, kinetics and regeneration studies
(Elsevier B.V., 2020-12-09T00:00:00) Saini, Jyoti; Garg, V.K.; Gupta, R.K.
In this study, dried orange peel powder [DOPP] is chemically modified with nanosilica (SiO2) employing sonication technique to produce nanobioadsorbent [SiO2@DOPP]. [SiO2@DOPP] This nanoadsorbent was evaluated for Cd2+ removal from aqueous systems. Successful functionalization of [DOPP] into nanosilica was confirmed by various analytical techniques like XRD, FTIR, SEM, EDX, TEM, DLS, pHzpc and TGA. XRD, FTIR and EDX confirmed the emergence of new peaks after modification of [DOPP] by nanosilica and adsorption of Cd2+ onto [SiO2@DOPP]. Further, TGA spectrum suggested that [SiO2@DOPP] nanoadsorbent is thermally more stable than [DOPP]. pH plays a major role to Cd2+ adsorption onto [SiO2@DOPP]. The optimum conditions for Cd2+ removal include pH = 6.5 and 0.03g adsorbent dose with 100 min contact time. Different adsorption isotherms models [best fitted-(Langmuir adsorption model)], adsorption kinetics [best fitted�(Pseudo second order and Intraparticle diffusion)] were examined for the removal of Cd2+. The maximum monolayer adsorption capacity [qmax] was 142 mg/g. Thermodynamic evaluation indicates the endothermic and spontaneous nature of Cd2+ adsorption onto [SiO2@DOPP]. Furthermore complexation mechanism of Cd2+ onto [SiO2@DOPP] is discussed in detail. The results indicate involvement of functional group interactions, ?�metal interactions, proton exchange, chelate complexes and electrostatic interactions during adsorption of Cd2+ onto [SiO2@DOPP]. Based on the results it has been inferred that [SiO2@DOPP] is a promising nanobioadsorbent to manage environment burden of Cd2+ from aqueous systems. � 2020 Elsevier B.V.
A comparative analysis of composts and vermicomposts derived from municipal solid waste for the growth and yield of green bean (Phaseolus vulgaris)
(Springer Verlag, 2017) Soobhany, N.; Mohee, R.; Garg, V.K.
This work was conducted to evaluate and compare the responses of Phaseolus vulgaris to three types of composts and vermicomposts derived from municipal solid waste (MSW). Different amendment rates were used and evaluated for their effect on germination, growth, and marketable yield. MSW-derived vermicomposts and composts were substituted into mineral brown-earth soil, applied at rates of 0 (control), 10, 20, 30, 40, 50, and 100% (v/v) in plastic pots of 7.2-L capacity. Green beans which are grown in 40% vermicompost/soil mixtures and compost/soil mixtures yielded 78.3?89.5% higher fruit weights as compared to control. Results showed that MSW vermicomposts consistently outperformed equivalent quantities of composts in terms of fruit yield, shoot, and root dry weights, which can be attributed to the contributions of physicochemical properties and nutrients content (N, P, and K) in the potting experiments. Consequently, it seemed likely that MSW vermicompost provided other biological inputs such as plant growth regulators (PGRs) and plant growth hormones (PGHs), which could have a considerably positive effect on the growth and yields of P. vulgaris as compared to composts. More in-depth scientific investigation is required in order to identify the distinctive effects and the exact mechanisms of these PGRs in MSW vermicomposts which influenced plant growth responses. ? 2017, Springer-Verlag Berlin Heidelberg.
Comparative analysis of vermicompost quality produced from rice straw and paper waste employing earthworm Eisenia fetida (Sav.)
(Elsevier Ltd, 2018) Sharma, K.; Garg, V.K.
Present study was undertaken to investigate the vermicomposting of two different organic wastes (rice straw and paper waste) employing, Eisenia fetida. Nine feedstocks were prepared with different ratios of wastes using cow dung as bulking substrate. After pre-composting, worms were allowed to feed on different feedstocks for 105 days under laboratory conditions. The results showed that NPK content was higher in the vermicompost. Heavy metal content was also higher in the vermicomposts. Whereas total organic carbon and C:N ratio were lower after vermicomposting, by 17.38?58.04% and 19?102% respectively. SEM images revealed changes in the morphology of vermicompost. Earthworm growth and reproduction was significant in different feedstocks except one containing 50% rice straw depicting that this ratio is not suitable for the earthworms. Results further demonstrated that proportion of bulking substrate affect the earthworm growth and reproduction. ? 2017 Elsevier Ltd
A comprehensive physico-chemical quality and heavy metal health risk assessment study for phreatic water sources in Narora Atomic Power Station region, Narora, India
(Springer Science and Business Media Deutschland GmbH, 2022-01-07T00:00:00) Singh, Manbir; Garg, V.K.
An investigation of water quality and heavy metal distribution in the groundwater samples collected from the vicinity of Narora Atomic Power Station (NAPS), Narora, India, was conducted for the metals including Cu, Zn, Ni, Co, Cd, Pb, and Fe. A total of 16 water quality parameters were measured for all the groundwater samples, and TDS, TH, Mg2+, Ca2+, F?, and turbidity were found to be on the higher side in comparison to the prescribed limits of Indian standards. Geometrical mean concentrations for these heavy metals were found to be 0.049, 0.213, 0.23, 0.135, 0.017, 0.061, and BDL for Cu, Fe, Zn, Pb, Cd, Co, and Ni, respectively. Pb and Cd were more than the permissible limits (0.01�mg/L for Pb and 0.003 for Cd) prescribed for safe drinking water while Cu and Fe were exceeding the permissible limits of 0.05�mg/L and 0.3�mg/L in 32% and 36% samples, respectively. Health risk assessment was done by calculating total hazard quotient (THQ), and the values for all the metals were below the threshold value of 1.0 beyond which they may pose a significant risk. � 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
COVID-19 lockdown: a rare opportunity to establish baseline pollution level of air pollutants in a megacity, India
(Springer Science and Business Media Deutschland GmbH, 2021-02-22T00:00:00) Sahoo, P.K.; Salom�o, G.N.; da Silva Ferreira J�nior, J.; de Lima Farias, D.; Powell, M.A.; Mittal, S.; Garg, V.K.
This paper analyses air quality data from megacity�Delhi, India, during different periods related to the COVID-19, including pre-lockdown, lockdown and unlocked (post-lockdown) (2018�2020) to determine what baseline levels of air pollutants might be and the level of impact that could be anticipated under the�COVID-19 lockdown�emission scenario. The results show that air quality improved significantly during the lockdown phases, with the most significant changes occurring in the transportation and industrially dominated areas. A pronounced decline in PM2.5 and PM10 up to 63% and 58%, respectively, was observed during the lockdown compared to the pre-lockdown period in 2020. When compared to 2018 and 2019, they were lower by up to 51% and 61%, respectively, dropping by 56% during unlock. Some pollutants (NOx and CO) dropped significantly during lockdown, while SO2 and O3 declined only slightly. Moreover, when compared between the different phases of lockdown, the maximum decline for most of the pollutants and air quality index occurred during the�lockdown phase 1; thus, this period was used to report the�COVID-19 baseline threshold values�(CBT; threshold value is the upper limit of baseline variation). Of the various�statistical methods used median + 2 median absolute deviation (mMAD)�was most suitable, indicating CBT values�of 143 and 75 ug/m3 for PM10 and PM2.5, respectively. This results although preliminary, but�it�gives a positive indication that temporary lockdown can be considered as a boon to mitigate the damage we have done to the environment. Also, this baseline levels can be helpful�as a first line of information�to set future�target limits�or to�develop effiective management policies for achieving better air quality in urban centres like Delhi. � 2021, Islamic Azad University (IAU).
COVID-19 pandemic: An outlook on its impact on air quality and its association with environmental variables in major cities of Punjab and Chandigarh, India
(Bellwether Publishing, Ltd., 2020-10-31T00:00:00) Sahoo, Prafulla Kumar; Chauhan, Amit Kumar; Mangla, Sherry; Pathak, Ashok Kumar; Garg, V.K.
The present study aims to evaluate the impact of COVID-19 lockdown on air quality and to explore the association of daily COVID-19 confirmed cases with meteorological parameters and criteria pollutants in the major cities of Punjab and Chandigarh, India during the different phase of pre-lockdown (March 1 to March 24), lockdown (1.0, 2.0, 3.0, 4.0; March 25 to May 31), and unlock (1.0, 2.0; > June 1) in 2020. Our results show that the COVID-19 lockdown has drastically improved the quality of air in major cities of Punjab and Chandigarh. Compared to pre-lockdown, maximum reduction of PM2.5 and PM10 levels (up to ?52 and ?53.5%, respectively) was witnessed during lockdown 1.0, but their levels were rising again during the last phase of lockdown and unlock phases. This is due to more relaxation and traffic returned on the road. Among other pollutants, NO2 also reduced during lockdown 1.0, but remained variable between cities and different phases of lockdown and unlock periods. However, surface-level ozone resulted in an overall increase trend during the lockdown and unlock phases. Regarding the relationship between COVID-19 and meteorological parameters, Spearman correlation test shows that ambient temperature is positively correlated with COVID-19 daily confirmed cases (r < 0.77, p < 0.01). This result indicates that the study region�s hot tropical weather is less effective in controlling the spread of COVID-19. Relative humidity and wind speed are also weakly correlated with COVID-19. Furthermore, among criteria pollutants, PM2.5 and PM10 are positively correlated (r < 0.55, p < 0.01) with COVID-19 pandemic, especially in Jalandhar and Ludhiana, suggesting that these pollutants could lead to the spreading of the virus. However, further in-depth studies are required to validate this finding. The results of this study can contribute to the understanding of the role of environmental factors in the transmission of COVID-19 in tropical and sub-tropical countries like India, Brazil, etc. This study also indicates that the temporarylockdown like COVID-19 can be emerged as an effective way to control environmental imbalancein the study area, as well as in other areas. � 2020 Informa UK Limited, trading as Taylor & Francis Group.
Distribution and concentration pathway of particulate pollution during pandemic-induced lockdown in metropolitan cities in India
(Institute for Ionics, 2023-06-12T00:00:00) Anand, A.; Garg, V.K.; Agrawal, A.; Mangla, S.; Pathak, A.
To characterize the pollutant dispersal across major metropolitan cities in India, daily particulate matter (PM10 and PM2.5) data for the study areas were collected from the National Air Quality Monitoring stations database provided by the Central Pollution Control Board (CPCB) of India. The data were analysed for three temporal ranges, i.e. before the pandemic-induced lockdown, during the lockdown, and after the upliftment of lockdown restrictions. For the purpose, the time scale ranged from 1st April to 31st May for the years 2019 (pre), 2020, and 2021 (post). Statistical distributions (lognormal, Weibull, and Gamma), aerosol optical thickness, and back trajectories were assessed for all three time periods. Most cities followed the lognormal distribution for PM2.5 during the lockdown period except Mumbai and Hyderabad. For PM10, all the regions followed the lognormal distribution. Delhi and Kolkata observed a maximum decline in particulate pollution of 41% and 52% for PM2.5 and 49% and 53% for PM10, respectively. Air mass back trajectory suggests local transmission of air mass during the lockdown period, and an undeniable decline in aerosol optical thickness was observed from the MODIS sensor. It can be concluded that statistical distribution analysis coupled with pollution models can be a counterpart in studying the dispersal and developing pollution abatement policies for specific sites. Moreover, incorporating remote sensing in pollution study can enhance the knowledge about the origin and movement of air parcels and can be helpful in taking decisions beforehand. � 2023, The Author(s) under exclusive licence to Iranian Society of Environmentalists (IRSEN) and Science and Research Branch, Islamic Azad University.
Estimation of Mineral and Trace Element Profile in Bubaline Milk Affected with Subclinical Mastitis
(Humana Press Inc., 2017) Singh, M.; Yadav, P.; Sharma, A.; Garg, V.K.; Mittal, D.
The milk samples from buffaloes of Murrah breed at mid lactation stage, reared at an organised dairy farm, were screened for subclinical mastitis based on bacteriological examination and somatic cell count following International Dairy Federation criteria. Milk samples from subclinical mastitis infected and healthy buffaloes were analysed to evaluate physicochemical alterations in terms of protein, fat, pH, electrical conductivity, chloride, minerals (sodium, potassium and calcium) and trace elements (iron, zinc, copper and selenium). In the present study, protein, fat, zinc, iron, calcium and selenium content was significantly lower (P?
Inactivation of bacterial pathogenic load in compost against vermicompost of organic solid waste aiming to achieve sanitation goals: A review
(Elsevier Ltd, 2017) Soobhany, N.; Mohee, R.; Garg, V.K.
Waste management strategies for organic residues, such as composting and vermicomposting, have been implemented in some developed and developing countries to solve the problem of organic solid waste (OSW). Yet, these biological treatment technologies do not always result in good quality compost or vermicompost with regards to sanitation capacity owing to the presence of bacterial pathogenic substances in objectionable concentrations. The presence of pathogens in soil conditioners poses a potential health hazard and their occurrence is of particular significance in composts and/or vermicomposts produced from organic materials. Past and present researches demonstrated a high-degree of agreement that various pathogens survive after the composting of certain OSW but whether similar changes in bacterial pathogenic loads arise during vermitechnology has not been thoroughly elucidated. This review garners information regarding the status of various pathogenic bacteria which survived or diffused after the composting process compared to the status of these pathogens after the vermicomposting of OSW with the aim of achieving sanitation goals. This work is also indispensable for the specification of compost quality guidelines concerning pathogen loads which would be specific to treatment technology. It was hypothesized that vermicomposting process for OSW can be efficacious in sustaining the existence of pathogenic organisms most specifically; human pathogens under safety levels. In summary, earthworms can be regarded as a way of obliterating pathogenic bacteria from OSW in a manner equivalent to earthworm gut transit mechanism which classifies vermicomposting as a promising sanitation technique in comparison to composting processes. ? 2017 Elsevier Ltd
Influence of stocking density on the vermicomposting of an effluent treatment plant sludge amended with cow dung
(Springer Verlag, 2016) Yadav, A.; Garg, V.K.
This paper reports the effect of earthworm population density on the vermicomposting of effluent treatment plant sludge of a bakery industry. Four waste mixtures containing 0, 10, 20, and 30?% sludge along with cow dung with five different worm population densities were established for 14?weeks under controlled moisture and temperature conditions. The results showed that average worm biomass, growth and cocoon production were lesser at higher population densities. Sexual maturity was attained in 3rd to 5th week in all waste mixtures. Worm growth was inversely related to worm population density in the waste mixture. Results also indicated that lower worm population is favorable to worm biomass production. On the other hand, mineralization and stabilization of the waste mixtures were more at higher worm populations. ? 2016, Springer-Verlag Berlin Heidelberg.
Management of banana crop waste biomass using vermicomposting technology
(Elsevier Ltd, 2021-01-20T00:00:00) Mago, Monika; Yadav, Anoop; Gupta, Renuka; Garg, V.K.
This study reports the vermicomposting of banana crop waste biomass by Eisenia fetida. Cow dung has been used as bulking agent in this study. The experiment was conducted in six vermireactors containing different ratios of banana leaf waste biomass (BL) and cow dung (CD) for 105 days. Earthworm activity significantly reduced pH, TOC, C:N and C:P ratio of the wastes. Whereas macronutrients and micronutrients content increased after vermicomposting. TOC content of wastes reduced by 40�64% and C:N ratio of the vermicomposts was in the range of 8.9�24.3. The benefit ratio for heavy metals (Cu, Fe, Zn, Cd, Pb, Mn and Cr) was in the range of 0.23�3.44. The results indicated that the growth and fecundity of the earthworms was best in the vermireactors having 20�40% BL. Finally, it was concluded that vermicomposting can be included in the overall scheme of banana crop waste management. � 2021 Elsevier Ltd
Management of food and vegetable processing waste spiked with buffalo waste using earthworms (Eisenia fetida)
(Springer Verlag, 2017) Sharma, K.; Garg, V.K.
The present investigation was focused on the vermicomposting of food and vegetable processing waste (VW) mixed with buffalo dung (BW) under laboratory condition employing Eisenia fetida earthworm species. Four different proportions of VW and BW were prepared and subjected to vermicomposting after 3?weeks of pre-composting. After vermicomposting, nitrogen (7.82?20.73?g/kg), total available phosphate (4.80?11.74?g/kg) and total potassium (7.43?12.75?g/kg) content increased significantly as compared to initial feed stocks. Significant reduction was observed in pH (7.56 to 6.55), total organic carbon (48.25?23.54%) and organic matter (83.18?40.68%). Metal content (Fe, Cu, Zn and Ni) was higher in all the vermicomposts than feedstocks. Data on growth and reproduction of earthworm revealed that the highest biomass gain and fecundity of worms were attained in 100% BW followed by [BW75%?+?VW25%]?>?[BW50%?+?VW50%]?>?[BW25%?+?VW75%] feedstocks. Results evidenced the suitability of VW (up to 50%) spiked with BW for increasing earthworm population and in providing potent organic manure for agricultural applications. ? 2017, Springer-Verlag Berlin Heidelberg.
Minerals and trace elements status of blood serum of lactating goats in a semi-arid region of southwest of Haryana State, India
(Springer Science and Business Media Deutschland GmbH, 2022-10-05T00:00:00) Singh, Mahavir; Yadav, Poonam; Garg, V.K.; Sharma, Anshu; Singh, Balvinder
Present study was undertaken to determine Beetal breed goats� serum minerals and trace elements levels which were reared in an organized farm in semi-arid region of south-west of�Haryana State,�India. Ruminants selected�for this study were of 2�6�years�age group in post-calving lactation stage. For the quantification of minerals and trace elements, flame photometry and flame atomic absorption spectrophotometry were used, respectively. The results reported that average minerals (Na, K) concentration in goats� serum was lesser but Ca levels�were higher than the reference values. Average trace elements (Zn and Cu) concentration in serum�was higher than reference values. For the descriptive statistics of the studied variables in goat serum, ORIGIN software package was used. With positive skewness values K, Ca and Zn had distribution towards higher range while Na, Fe and Cu with negative skewness values presented distribution in lower range. Zn represented leptokurtic distribution and also the right clustered scores. Copper with lower inter-quartile range was found to be the sole element which had data points clustered around the mean value. Almost equal arithmetic and geometric mean values of trace elements and minerals in goats� serum suggested lesser spatial variation in the data. � 2022, The Author(s), under exclusive licence to Accademia Nazionale dei Lincei.
A novel CaO nanocomposite cross linked graphene oxide for Cr(VI) removal and sensing from wastewater
(Elsevier Ltd, 2022-04-27T00:00:00) Singh, Simranjeet; Naik, T.S. Sunil Kumar; Anil, Amith G.; Khasnabis, Sutripto; Nath, Bidisha; U, Basavaraju; Kumar, Vineet; Garg, V.K.; Subramanian, S.; Singh, Joginder; Ramamurthy, Praveen C.
A novel green nanocomposite has been prepared by immobilizing CaO nanoparticles (CaO NPs) on the surface of graphene oxide. Biogenic CaO-NPs were synthesized from Lala clamshells. Morphological and structural characterizations of the nanocomposite were studied extensively. The adsorption capacity (qmax) of the nanocomposite for removing Cr(VI) was 38.04 mg g?1. In addition to this, the adsorption data were adequately simulated with Langmuir, Freundlich, Temkin, and pseudo-second-order models, suggesting that the adsorption process was the combination of external mass transfer and chemisorption. Electrostatic interaction was the dominant mechanism for Cr(VI) removal. In addition, the synthesized nanocomposites also serve as an excellent sensor for Cr(VI) sensing, with a limit of detection (LOD) of 0.02 ?M utilizing electrochemical methods. Therefore, this green nanocomposite can simultaneously serve as an adsorbent and sensor for Cr(VI)removal from aqueous solutions. � 2022 Elsevier Ltd
Preparation, characterization and potential use of flower shaped Zinc oxide nanoparticles (ZON) for the adsorption of Victoria Blue B dye from aqueous solution
(Elsevier B.V., 2016) Kataria, N.; Garg, V.K.; Jain, M.; Kadirvelu, K.
In present work, the performance and effectiveness of flower-shaped Zinc oxide nanoparticles (ZON) synthesised by hydrothermal method was evaluated for the adsorption of Victoria Blue B (VB B) dye from aqueous solution. ZON were characterised by using XRD, FTIR, SEM, EDX and DLS. Batch mode adsorption experiments were carried out to optimise the process conditions viz., pH, adsorbent dose, dye concentration, temperature, etc. The adsorption of cationic dye onto ZON surface was illustrated by Langmuir and Temkin isotherm models. The mechanism of dye adsorption onto the nanoparticles was explained by pseudo-second order kinetic model (R2???0.997). The thermodynamic parameters including Gibb's free energy (?G0), enthalpy (?H0), and entropy (?S0) were studied at different temperatures (10?70??C). The maximum adsorption capacity of VB B dye onto ZON was achieved up to 163?mg/g at pH 6.0 and temperature 27???1??C. ? 2016 The Society of Powder Technology Japan