Browsing by Author "Chitra Devi, Venkatachalam"

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    MODIFICATION OF CELLULOSE ACETATE MEMBRANE BY INTEGRATING MAGNETITE@XANTHAN GUM NANOCOMPOSITE TO ENHANCE PERFORMANCE CHARACTERISTICS
    (Elsevier, 2024) Sathish, Raam Ravichandran; Chitra Devi, Venkatachalam; Mothil, Sengottian; Deenadhayalan, Ramachandran; Asswin, Saminathan; Ananth, Raja; Geetha, Venkatesan; Arunachalam, Chinnathambi; Sabariswaran, Kandasamy
    Membrane technology, a versatile alternative to traditional separation processes in industries and wastewater treatment, was employed in this study. Membranes were fabricated using cellulose acetate (C), dimethyl sulfoxide (D), and glycerol (G) at various weight percentages. To enhance membrane performance, a Magnetite@Xanthan gum nanocomposite (NC) was synthesized in-situ and analysed using FESEM-EDS. Experimental investigations incorporated the doping of the membrane with NC at different percentages (0 wt%, 0.1 wt%, 0.5 wt%, and 1.0 wt%). Increasing NC content resulted in smoother surfaces, improving anti-fouling characteristics, as confirmed by AFM. Integrating NC into the pure membrane reduced the contact angle, with 1.0 wt% Fe3O4@XG recording the lowest angle at 56.18°. Physical property analyses covered viscosity, pH, water uptake percentage, and porosity to assess the impact of NC integration. Under 5 atm pressure, the 1.0 wt% Fe3O4@XG membrane exhibited a substantial pure water flux of 3069.55 lit.m-2 h−1 compared to pure CDG. Furthermore, the 0.5 wt% Fe3O4@XG membrane displayed the highest flux recovery ratio (60.42%) compared to pure CDG (48.18%). A biodegradability test showed that the 1.0 wt% Fe3O4@XG membrane exhibited superior weight loss (43.75%) over 28 days. This research underscores the potential of these membranes for diverse applications, including wastewater treatment and sustainability.
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    A REVIEW ON HYDROTHERMAL LIQUEFACTION OF ALGAL BIOMASS ON PROCESS PARAMETERS, PURIFICATION AND APPLICATIONS
    (Elsevier, 2022-04-01) Sathish Raam, Ravichandran; Chitra Devi, Venkatachalam; Mothil, Sengottian; Sarath, Sekar; Sabariswaran, Kandasamy; Kesav Prasath, Ramasamy Subramanian; Kirubakaran, Purushothaman; Aravindan Lavanya, Chandrasekaran; Mathiyazhagan, Narayanan
    Algae, a potential biomass feedstock with a faster growth rate and capability of greenhouse gas absorption, mitigates the limitations of the first- and second-generation feedstock in bio-oil production. hydrothermal liquefaction (HTL) is known to be an active method capable of producing substantial energy resources. In HTL, biomass undergoes thermal depolymerization in the presence of water, at around 280 °C–350 °C following subcritical and near supercritical conditions to produce chemical compounds such as alkanes, nitrogenates, esters, phenolics, etc. The primary product, “Biocrude/Bio-oil” obtained from the reaction, is identified as the essential fuel source after processing and also as a distinct value-added chemical source, along with biochar and biogas as co-products. This review outlines a range of routes available for thermochemical conversion of the algal biomass. It also provides a better understanding of the reaction mechanism like depolymerization, decomposition, and re-polymerization, operating conditions like temperature, pressure, the quantity of catalyst required, and the solvent used in the process. The review also highlights the yield achieved by altering the aforementioned parameters, comparing and presenting them as a collective result.