Sorokhaibam Laxmi Gayatri - Activated tea waste as a potential low-cost adsorbent for the removal of p -nitrophenol from wastewater

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      Ahmaruzzaman, M., Gayatri, S. Laxmi Journal of Chemical and   Engineering Data 2010 -

      Abstract: The aim of this work was to determine   the potential of activated tea waste (ATW) as a useful adsorbent   for the removal of p-nitrophenol (p-NP) from aqueous systems. The   study was realized using batch experiments with synthetic   wastewater having a p-NP concentration of 1000 mg·L-1. The   effects of pH, contact time, and presence of anions were   investigated. An increase in the pH to above neutrality resulted   in a decrease in the p-NP adsorption capacity. The adsorption   process reached equilibrium within 5 h of contact time. The   Freundlich, Langmuir, Temkin, Dubunin-Radushkevich, and   Redlich-Peterson adsorption models were used for mathematical   description of the adsorption equilibrium, and it was found that   the experimental data fitted very well to the Langmuir isotherm.   Batch adsorption studies, based on the assumption of a   pseudo-first-order, pseudo-second-order, or intraparticle   diffusion mechanism, showed that the kinetic data followed   closely a pseudo-second-order rather than a pseudo-first-order   mechanism. The adsorption capacity of ATW for the removal of p-NP   was found to be 142.85 mg· g-1. These results clearly indicate   the efficiency of activated tea waste (ATW) as a low-cost   adsorbent for treatment of wastewater containing p-NP.

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