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Subject: Environmental Science × Author: Charu × Start date: 2019 × Type: Thesis ×
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    ThesisItemOpen Access
    Development of wheat straw-based adsorbent and its application in anionic dye removal
    (CCSHAU, Hisar, 2021-08-23) Charu; Rahul Kumar
    The present research investigated the adsorption of Congo red dye on wheat straw-based adsorbents. Experiments were performed using modified wheat straws (CTAB and EDA treated wheat straw). Prepared adsorbents were characterized by physico-chemical (pH, EC, PZC), proximate and ultimate analysis, surface morphological (SEM), and energy dispersive spectroscopic (EDS) analysis. Various operational parameters were studied like the effect of pH, the effect of adsorbent dose, the effect of contact time, the effect of dye concentration and temperature. pH and adsorbent dose for the reactions were optimized to 5 and 0.4g/L whereas equilibrium time was found to be 210 min in the case of EWS and 180 min for CWS. The experimental data were studied with the help of Kinetics and isotherm studies. Pseudo-first-order and Pseudo-second-order models were applied to study the kinetics of the reaction. The Pseudo-first-order model was the best fit for CWS whereas the Pseudo-second order model better defined the kinetics results for EWS. Langmuir and Freundlich models were applied for isotherm studies. Langmuir‟s model was the best fit in both cases. The adsorption of dye on CWS was found to be a spontaneous and exothermic process whereas for EWS adsorption process was a spontaneous and endothermic process. The findings suggested that modified wheat straws can be used as adsorbents for the extraction of Congo red dye from an aqueous solution.