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Treatment of dyes contaminated water using surfactants modified activated carbon derived from rice husk

Waqas Ahmad,Zakia Amin,Tanzil ur Rehman,F. Hussain,M. Ilyas

Published 2022 in Desalination and Water Treatment

ABSTRACT

In the present work, the surfactant modified activated carbon (AC) was used for the elimination of water soluble dyes, i.e. methylene blue (MB) and crystal violet (CV) dyes from aqueous solutions. The AC was prepared from rice husk by carbonization process, and then activated by treat- ment with zinc chloride (ZnCl 2 ). The AC was further modified by sodium dodecyl sulfate (SDS) and sodium cupryl acetate (SCA) surfactants. The AC, SDS/AC and spent SDS/AC were characterized by SEM, FT-IR, XRD and EDX analysis. Under optimized conditions the adsorption was found to be better as compared to be AC and SCA/AC, under which maximum adsorption of MB and CV over SDS/AC was found to be 90% and 85%, respectively. Kinetic and isotherm studies revealed that adsorption of both dyes over SDS/AC occur through pseudo-second-order kinetics and follow the Freundlich adsorption isotherm model. The various thermodynamic parameters, like Δ G °, Δ H ° and Δ S ° shown that the process of adsorption dyes over SDS/AC was an endothermic and spontaneous process. According to the data analysis that % removal of MB using AC, SCA/AC and SDS/ AC was 75%, 83% and 84.86%, separately, while using same adsorbents the % removal of CV was 31.5%, 79% and 84.94%, respectively. It is clear from these consequences that the adsorption effec- tiveness of the AC was significantly enhanced with the surfactant modification. Findings from this study suggest that SDS/AC could be utilized as a promising adsorbent at the same time eliminating MB and CV from wastewater.

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