School Of Environment And Earth Sciences

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Author: search.filters.author.J, Rajesh Banu

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    Synergistic effect of TiO2 nanostructured cathode in microbial fuel cell for bioelectricity enhancement
    (Elsevier Ltd, 2023-03-30T00:00:00) Jaswal, Vijay; J, Rajesh Banu; N, Yogalakshmi K.
    Nano-bedecking of electrode with nanoparticles is an effective method to improve power generation of microbial fuel cells (MFCs). In this study, different concentrations (0.25 mg cm?2, 0.50 mg cm?2, 0.75 mg cm?2 and 1.0 mg cm?2) of TiO2 nanoparticles of size 10�25 nm were overlaid on the carbon cloth (CC) using spray pyrolysis technique and used as catalytic cathode in a dual-chambered microbial fuel cell treating distillery wastewater. Results evidenced that TiO2 nanoparticles modified cathode increased the power generation and recorded a highest power and current density of 162.5 � 2 mW m?2 and 1.4 � 0.005 A m?2, respectively. Carbon cloth coated with 0.50 mg cm?2 TiO2 nanoparticles showed 2.8 and 7.3 times higher current and power density as compared to uncoated cathode. MFC operated at a hydraulic retention time (HRT) and organic loading rate (OLR) of 72 h and 59.2 g COD L?1 d?1 showed a maximum chemical oxygen demand (COD) removal of 72.3% which was 15.3% higher than the control MFC. Likewise, the coulombic efficiency of control and modified MFC was 33% and 44%, respectively. The maximum NO3?- N, NO2?- N and NH4+- N removal efficiency of 77.3%, 49.9% and 59.4% were observed for TiO2 nanoparticles modified electrode which was 19.3%, 11.4% and 10.5% higher than control. TiO2 modified cathode was effective in enhancing the bioelectricity generation in MFCs. � 2023
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    Lignocellulosic Biorefinery Technologies: A Perception into Recent Advances in Biomass Fractionation, Biorefineries, Economic Hurdles and Market Outlook
    (MDPI, 2023-03-01T00:00:00) K.N, Yogalakshmi; T.M, Mohamed Usman; Kavitha, S.; Sachdeva, Saloni; Thakur, Shivani; Adish Kumar, S.; J, Rajesh Banu
    Lignocellulosic biomasses (LCB) are sustainable and abundantly available feedstocks for the production of biofuel and biochemicals via suitable bioconversion processing. The main aim of this review is to focus on strategies needed for the progression of viable lignocellulosic biomass-based biorefineries (integrated approaches) to generate biofuels and biochemicals. Processing biomass in a sustainable manner is a major challenge that demands the accomplishment of basic requirements relating to cost effectiveness and environmental sustainability. The challenges associated with biomass availability and the bioconversion process have been explained in detail in this review. Limitations associated with biomass structural composition can obstruct the feasibility of biofuel production, especially in mono-process approaches. In such cases, biorefinery approaches and integrated systems certainly lead to improved biofuel conversion. This review paper provides a summary of mono and integrated approaches, their limitations and advantages in LCB bioconversion to biofuel and biochemicals. � 2023 by the authors.
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    Lignocellulosic biomass-based pyrolysis: A comprehensive review
    (Elsevier Ltd, 2021-08-06T00:00:00) K N, Yogalakshmi; T, Poornima Devi; P, Sivashanmugam; S, Kavitha; R, Yukesh Kannah; Varjani, Sunita; AdishKumar, S.; Kumar, Gopalakrishnan; J, Rajesh Banu
    The efficacious application of lignocellulosic biomass for the new valuable chemicals generation curbs the excessive dependency on fossil fuels. Among the various techniques available, pyrolysis has garnered much attention for conversion of lignocellulosic biomass (encompasses cellulose, hemicellulose and lignin components) into product of solid, liquid and gases by thermal decomposition in an efficient manner. Pyrolysis conversion mechanism can be outlined as formation of char, depolymerisation, fragmentation and other secondary reactions. This paper gives a deep insight about the pyrolytic behavior of the lignocellulosic components accompanied by its by-products. Also several parameters such as reaction environment, temperature, residence time and heating rate which has a great impact on the pyrolysis process are also elucidated in a detailed manner. In addition the environmental and economical facet of lignocellulosic biomass pyrolysis for commercialization at industrial scale is critically analyzed. This article also illustrates the prevailing challenges and inhibition in implementing lignocellulosic biomass based pyrolysis with possible solution. � 2021