Dyes removal from wastewaters has received much attention from material, chemical, and environmental scientists because of the many environmental issues, and the growing use of dyes in various industries such as textile, dying, rubber, leather, printing, cosmetics, papermaking, food and pharmaceutical coloring. The contamination of water even at very low concentrations of dyes causes a range of environmental and human health problems. In recent years, synthesis and development of chitosan-based hydrogels has gained much attention. Chemically cross-linked hydrogels are able to maintain their mechanical stability while absorb large amounts of water. Here in, we have synthesized (3-chloropropyl) trimethoxysilane functionalized magnetic nanoparticles grafted to chitosan hydrogel cross-linked with 3,3′,4,4′-tetracarboxybenzophenone dianhydride for dye removal applications.(scheme 1) The results showed that the presence of magnetic nanoparticles in hydrogels provided better dye adsorption in comparison to the pure hydrogel.
