Abstract
An efficient and economical material has been developed for the removal of arsenic (III) and (V) from contaminated water using commercially available synthetic graphite (SG) flakes. To enhance adsorption capacity of SG, it was treated with 3-mercaptopropionic acid followed by functionalization with zinc peroxide nanoparticles. Interestingly, the adsorption efficacy of functionalized synthetic graphite (FSG) enhanced several times in comparison to pure SG. The proposed materials efficiently removes arsenic (III) and (V) in the pH range 7.5–8.0 and 3.9–4.5 respectively below detection limits of Atomic Absorption Spectrometer- Hydride Generator. The water purified by FSG can be used for several applications including potability as per described standards of world health organization (WHO) and United State-Environmental Protection Agency (US-EPA). The adsorption data were fitted to kinetics and isotherm models to analyze the adsorption mechanism and it has been found that adsorption data were best fitted with pseudo second order kinetic model and Fruendlich adsorption isotherm, indicating chemisorption and multilayer adsorption on heterogeneous surface respectively.
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