School Of Environment And Earth Sciences

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    Development of iron oxide/activated carbon nanoparticle composite for the removal of Cr(VI), Cu(II) and Cd(II) ions from aqueous solution
    (Elsevier B.V., 2018) Jain M.; Yadav M.; Kohout T.; Lahtinen M.; Garg V.K.; Sillanp M.
    Iron oxide (Fe3O4) and iron oxide/activated carbon (Fe3O4/AC) were fabricated by co-precipitation method for the removal of Cr(VI), Cu(II) and Cd(II) ions from aqueous solution in batch mode. These nanoparticles were characterized by BET, FTIR, XRD, SEM/TEM and VSM. The optimum conditions for the removal of ions were pH = 2 for Cr(VI) and 6 for Cu(II) and Cd(II), initial metal ion concentration = 50 mg L−1, nanoparticle dose = 50 mg/10 mL, temperature = 25 ± 1 °C, shaking speed = 180 rpm and contact time = 3 h. The equilibrium data of ions sorption were well described by Langmuir, Freundlich, Redlich-Peterson and Intraparticle Diffusion model. The R2 values obtained by Langmuir model were highest by Fe3O4/AC for Cr(VI) = 0.9994,Cu(II) = 0.9998 and Cd(II)= 0.9750. The temperature dependent study in the range of 288–328 K confirmed that the adsorption process was endothermic in nature. Desorption studies with 0.1 M HCl stated that these nanoparticles can be regenerated effectively and can be used after four adsorption-desorption cycles without any mass loss.
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    Dissolution rate of Basalt
    (Central University of Punjab, 2018) K Panigrahi, Somesh; K Pattanaik, Jitendra
    Physical weathering, Chemical weathering, climate and grain size strongly influences the weathering rate of dissolution. To determine the basalt dissolution rate at various physical-chemical conditions and create an artificial weathering set up by controlling pH, time, grain size in the lab. Three fresh (F.R A1, A2 and Fresh basalt (2/RT12/2)) and one weather (B1) samples of basalt was taken for the defining the rate of weathering. 125-75 and 75-38?m grains size of samples were treated with pH 4, pH 6 continuously agitate for 24, 72, 48 hours and 168 hours at room temperature. Mineral phase identification and geochemical measurements were carried out using XRD and ICP-MS analysis. B1 is less dense compared to other three samples (F.R A1, A2 and Fresh basalt (2/RT12/2)) and A2 shows the high density. Initial pH 4 changed into pH 4.5 and the pH 6 samples changed into pH 7 during dissolution of basalt. In Acidic condition/ low pH the leached elemental concentration is found to be high. Effect of grain size variation in the dissolution rate found to be less. The dissolution rate is higher in the initial stage and reduced with time. Weathered samples shows higher mineral dissolution rate compare to the fresh basalt.
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    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?