Synthesis of Sodium Alginate Graft Poly (Acrylic Acid-Co-2-Acrylamido-2-Methyl-1-Propane Sulfonic Acid)/Attapulgite Hydrogel Composite and the Study of its Adsorption

Abstract

A new hydrogel composite, sodium alginate graft poly (acrylic acid-co-2-acrylamido-2-methyl-1-propane sulfonic acid)/attapulgite, was prepared and characterized. Adsorption of heavy metal ions onto the composite was studied. Maximum adsorption capacities for Pb²⁺, Cd²⁺, Cu²⁺ and Zn²⁺ were 1016.77, 79.38, 406.71 and 294.86 mg/g, respectively. It revealed that chelation played a prominent part in the adsorption of Pb²⁺, while ion-exchange was dominant for the other three metal ions. The adsorption of Pb²⁺, Cd²⁺ and Cu²⁺ was consistent with Langmuir model, and that of Zn²⁺ was in accordance with both Langmuir and Freundlich models. The composite showed great renewable performances.

Keywords:

• Adsorption
• Hydrogel composite
• Synthesis

ACKNOWLEDGMENTS

The authors are grateful to the supporting by A Project of Shandong Province Higher Educational Science and Technology Program (J13LD07) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (20113718120006).