Polysaccharide-derived hydrogel water filter for the rapid and selective removal of arsenic
A low-cost furfuraldehyde-chitosan cross-linked hydrogel (FCH) has been designed and synthesized as a smart bio-adsorbent for selective removal of As(V) from an aqueous solution using solid liquid extraction (SLX) technique. The adsorption behavior of FCH towards As(V) has been thoroughly investigated and optimized the parameters such as pH, amount of cross-linking agent, time of contact and weight of the hydrogel. The adsorption kinetics of the FCH hydrogels for As(V) followed a pseudo-second-order model with initial adsorption rate of 0.1479 g mg-1 min-1. 0.5 M HNO3 used as efficient eluent to desorb As(V) without noticeable loss of adsorption capacity of the FCH hydrogel for As(V) after a few repeated adsorption/desorption cycles. This hydrogel is also effective for economically viable, rapid and selective removal of arsenic from groundwater.