Abstract
In the present work iron particles was recovered by dry magnetic separation, from waste steel slag, doped with chitosan for adsorbent prepared, characterized and evaluated for the removal of As(V) from an aqueous solution. The adsorption of As(V) was optimized by using response surface methodology through Box-Behnken design model, which gave high correlation coefficient (R2 = 0.9175), and a predictive model of quadratic polynomial equation. Analysis of variance and Fischer's F-test were used to govern the parameters which interrupt the adsorption of As(V).The adsorbent was characterized by FTIR, XRD and SEM. Optimal conditions, including adsorbent dosage, pH, temperature, initial ion concentration and contact time for the removal of As(V), were found to be 0.8 g, pH 4, 308 K, 10 mg L−1 and 3 h, respectively. Langmuir isotherm model fitted better compared to the Freundlich model having a maximum adsorption capacity of 11.76 mg g−1, a high regression coefficient value of 0.993 and least chi-square value of 0.1959. The process was found to follow monolayer adsorption and pseudo-second-order kinetics. Thermodynamic parameters such as ∆S, ∆H and ∆G indicated the feasibility, spontaneous and endothermic nature of adsorption. Successful regeneration of the adsorbent implies its applicability to the removal of arsenic from real life wastewater.
Highlights
Arsenic is a pervasive element in the environment and has been known as a notorious toxic substance to man and living organisms for centuries [1]
Chitosan (CS, MW = 2.65 × 105 Da) with > 80 % deacetylation degree, Sodium hydrogen arsenate (Na2HAsO4.7H2O), Sodium hydroxide and acetic acid were of analytical grade, acquired from Sigma Aldrich
Morphology study, (Fig. 1 (a), (b) and (c)), shows that the adsorbent is porous in nature and entitles good complexes with adsorbed arsenic ions
Summary
Arsenic is a pervasive element in the environment and has been known as a notorious toxic substance to man and living organisms for centuries [1]. Groundwater arsenic is primarily associated with oxidative weathering and geochemical reactions. Carbon plays a major role in the mobilization of arsenic in the sediments [2]. Over 100 million people in Bangladesh, West Bengal, China, Mexico, Chile, Myanmar, and United states [3] were affected by the arsenic contaminated water. Long term exposure to arsenic in drinking water causes skin diseases (pigmentation, dermal hyperkeratosis, and skin cancer), cardiovascular, neurological, liver, kidney, and prostate cancers [4].
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