A multifunctional polyacrylamide/chitosan hydrogel for dyes adsorption and metal ions detection in water.

Removing noxious dyes and detecting excessive metal ions in water are both effective means to prevent damage from contaminants and ensure water safety. The emphasis problems were addressed by preparation a polyacrylamide chitosan (PAAM/CS) hydrogel. Polyacrylamide (PAAM) provides overall mechanical strength to carry loads and facilitate circulation, chitosan (CS) provides adsorption positions with high adsorption capacity. Which made that PAMM/CS hydrogel efficiently performed sorption of xylenol orange (XO). As the functional dye, XO binds to PAAM/CS and confers colorimetric properties on PAAM/CS hydrogels. XO sorbed hydrogel realized fluorescence dual-signal detection of Fe3+ and Al3+ in water. The significant swelling and adsorption potency of the hydrogel, combined with the dual-signal detection capability of XO sorbed hydrogel, make this hydrogel a versatile material for environmental applications. • Polyacrylamide chitosan hydrogel was prepared as adsorbent. • Adsorption mechanism is mainly based on electrostatic attraction. • After five adsorption cycles, the composite hydrogel still achieved 83.29 % removal of xylenol orange. • XO sorbed hydrogel realized fluorescence dual-signal detection of Fe3+ and Al3+ in water. [ABSTRACT FROM AUTHOR]