Presence of arsenic in groundwater, eventually in drinking water, has been recognised as a serious community health problem, due to its high toxic nature. Therefore, its removal is highly essential. Chitosan-based adsorbents have been widely used in water treatment in the present scenario due to their abundance and cost-effectiveness. However, there are some problems hindering its practical use, such as low tensile strength and low solubility in acidic mediums. Thus, in this work, to enhance the adsorption capacity of chitosan for the removal of As (V), it has been modified by grafting with monomer HEMA and SSS using gamma radiation. Modified chitosan was characterised by SEM and FTIR spectroscopy. In grafted and ungrafted chitosan, maximum adsorption capacity was found to be (16.8) mg/g and 1.78 (mg/g) using the 0.1 g of adsorbent dose at pH 3–4 in 35 min, and initial As (V) concentration of 60 mg/L. Isotherm study reveals the adsorption process followed by Langmuir isotherm model for both grafted and ungrafted chitosan. Kinetic study suggested that grafted chitosan followed pseudo second order whereas chitosan followed first order kinetics. The thermodynamics indicated that the adsorption process of modified chitosan for As (V) was endothermic and spontaneous in nature.

Presence of arsenic in groundwater, eventually in drinking water, has been recognised as a serious community health problem, due to its high toxic nature. Therefore, its removal is highly essential. Chitosan-based adsorbents have been widely used in water treatment in the present scenario due to their abundance and cost-effectiveness. However, there are some problems hindering its practical use, such as low tensile strength and low solubility in acidic mediums. Thus, in this work, to enhance the adsorption capacity of chitosan for the removal of As (V), it has been modified by grafting with monomer HEMA and SSS using gamma radiation. Modified chitosan was characterised by SEM and FTIR spectroscopy. In grafted and ungrafted chitosan, maximum adsorption capacity was found to be (16.8) mg/g and 1.78 (mg/g) using the 0.1 g of adsorbent dose at pH 3–4 in 35 min, and initial As (V) concentration of 60 mg/L. Isotherm study reveals the adsorption process followed by Langmuir isotherm model for both grafted and ungrafted chitosan. Kinetic study suggested that grafted chitosan followed pseudo second order whereas chitosan followed first order kinetics. The thermodynamics indicated that the adsorption process of modified chitosan for As (V) was endothermic and spontaneous in nature.

The removal of As (V) from aqueous solution was investigated with the grafted polymeric adsorbent (chitosan-g-HEMA) synthesized by using high energy ⁶⁰Co gamma radiation as well as by conventional chemical method. The swelling behavior of grafted polymer at different pH conditions and their kinetic studies were investigated. Fourier Transform Infrared Spectroscopy (FTIR) was used to characterize the grafted polymer and the morphological structure was analyzed by Scanning Electron Microscope (SEM). As (V) ions uptake capacity of the adsorbent was evaluated in the light of varying pH, contact time, temperature, adsorbent dose, and different arsenate ion concentration. The adsorption data was fitted well in the Langmuir model and various static parameters were calculated. The removal of toxic As (V) ions was carried out by batch method using grafted sorbents synthesized by both gamma radiation and chemical grafting methods and it was observed that the adsorbent synthesized by the use of gamma radiation shows higher adsorption capacity as compared to the chemically grafted polymer.

The removal of As (V) from aqueous solution was investigated with the grafted polymeric adsorbent (chitosan-g-HEMA) synthesized by using high energy ⁶⁰Co gamma radiation as well as by conventional chemical method. The swelling behavior of grafted polymer at different pH conditions and their kinetic studies were investigated. Fourier Transform Infrared Spectroscopy (FTIR) was used to characterize the grafted polymer and the morphological structure was analyzed by Scanning Electron Microscope (SEM). As (V) ions uptake capacity of the adsorbent was evaluated in the light of varying pH, contact time, temperature, adsorbent dose, and different arsenate ion concentration. The adsorption data was fitted well in the Langmuir model and various static parameters were calculated. The removal of toxic As (V) ions was carried out by batch method using grafted sorbents synthesized by both gamma radiation and chemical grafting methods and it was observed that the adsorbent synthesized by the use of gamma radiation shows higher adsorption capacity as compared to the chemically grafted polymer.