{'fraction_non_alphanumeric': 0.05964912280701754, 'fraction_numerical': 0.04093567251461988, 'mean_word_length': 4.944444444444445, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
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

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.