In areas in and around Bangladesh, groundwater is contaminated with naturally occurring arsenic, a toxic metalthat causes many negative health effects. Chitosan, the deacetylated derivative of chitin, is an abundant, non-toxic biopolymer that forms hydrogels in aqueous solution. It has previously been used in water treatment for coagulation and metal removal, as its insolubility allows for easy removal post-treatment. Alone, chitosan is an effective sorbent for cationic metals but not for anionic metals, like the arsenic oxyanions that exist in groundwater. TiO2 is a photo-oxidant that has been demonstrated to effectively remove arsenic, but the removal of TiO2 nanoparticles post-treatment has proven difficult. A novel sorbent material, TiO2-impregnated chitosan, that realizes the synergistic benefit of these two materials is under development. In batch experiments with exposure to UV light, this material is an effective arsenic sorbent, competing or exceeding the performance of current approaches but with the important benefit of ready removal post-treatment. Results indicate that both of the predominant arsenic species that exist in groundwater, arsenate and arsenite, are effectively removed. This is unusual because arsenite is uncharged over environmentally relevant pH and generally requires pre-oxidation to arsenate, a charged species, for removal in water treatment processes. Studies to optimize this sorbent for removal of arsenic in natural groundwaters and to develop implementation approaches of these materials as sorbents in the field are underway.