Synthesis of a three-dimensional network sodium alginate–poly(acrylic acid)/attapulgite hydrogel with good mechanic property and reusability for efficient adsorption of Cu2+ and Pb2

Water pollution caused by heavy metals has dramatically impacted ecosystems in recent years. For instance, 45.4% of lakes in China are in the category of moderate to high risk of toxic metal pollution, due to excessive mining. There is, therefore, a need for efficient techniques of metal decontamina...

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Bibliographic Details
Published in:Environmental chemistry letters 2018-06, Vol.16 (2), p.653-658
Main Authors: Mao, Xinyou, Wang, Lan, Gu, Shiqing, Duan, Yanyan, Zhu, Yunqing, Wang, Chuanyi, Lichtfouse, Eric
Format: Article
Language:English
Subjects:
Acids
Acrylic acid
Acrylics
Adsorbents
Adsorption
Alginic acid
Analytical Chemistry
Capacity
Chemical Sciences
Chemical synthesis
Compressive properties
Copper
Decontamination
Earth and Environmental Science
Ecosystems
Ecotoxicology
Environment
Environmental Chemistry
Environmental Engineering
Environmental impact
Environmental Sciences
Geochemistry
Heavy metals
Hydrogels
Interpenetrating networks
Lakes
Lead
Mechanical properties
Metals
Original Paper
Pollution
Polymers
Removal
Seaweed meal
Sodium
Sodium alginate
Water pollution
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Summary:Water pollution caused by heavy metals has dramatically impacted ecosystems in recent years. For instance, 45.4% of lakes in China are in the category of moderate to high risk of toxic metal pollution, due to excessive mining. There is, therefore, a need for efficient techniques of metal decontamination. Hydrogels are gaining interest as heavy metal adsorbents because of their easy separation, but hydrogel applications are limited due to their poor mechanical property. Here we solve this problem by introducing natural attapulgite into the sodium alginate–poly(acrylic acid) semi-interpenetrating polymer network of the hydrogel. Results show that the compressive stress of the hydrogel with 10% attapulgite, of 1.230 Mpa, was 4.1 times higher than that of pure hydrogel, of 0.299 MPa. The adsorption capacity of hydrogel with 10% attapulgite was high, of 272.8 mg/g for Cu 2+ and 391.7 mg/g for Pb 2+ . Even after five cycles of adsorption, the hydrogel with 10% attapulgite still adsorbs 261.7 mg/g Cu 2+ and 368.1 mg/g Pb 2+ . Our findings thus reveal that network-structured sodium alginate–poly(acrylic acid)/attapulgite hydrogel holds great potential as an efficient and recyclable adsorbent for heavy metal removal.
ISSN:1610-3653
1610-3661
DOI:10.1007/s10311-018-0708-9