Journal
JOURNAL OF CLEANER PRODUCTION
Volume 376, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2022.134253
Keywords
Polymer-MB; Acrylic acid; Sodium carboxymethyl cellulose; Adsorption; Chemical compatibility
Categories
Funding
- National Key Research and Development Program of China [2020YFC1808103]
- Shanghai Municipal Science and Technology Major Project [2021SHZDZX0100]
- Shanghai Municipal Commission of Science and Technology Project [19511132101]
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Modified bentonite (MB) with carboxyl and hydroxyl groups on a coverage film was successfully prepared and used for the removal of Cd2+ and Pb2+. The adsorption mechanism of MB for Cd2+ and Pb2+ was determined by analyzing multiple kinetics and isotherms. Additionally, MB exhibited good permeability control in high-concentration heavy-metal solution.
Modified bentonite (MB) was prepared with acrylic acid and sodium carboxymethyl cellulose as monomers, which was characterized with carboxyl and hydroxyl groups on a coverage film. The adsorption capacities for Cd2+ and Pb2+ were increased to 222.41 mg/g and 397.17 mg/g, respectively, indicating that Cd2+ was less competitive than Pb2+. Multiple adsorption kinetics and isotherms indicated that the Cd2+ adsorption by MB was dominated by ion exchange, while Pb2+ adsorption was a combination of physical adsorption and ion exchange. The positron annihilation lifetime (PAL) further indicated that the adsorption of both Cd2+ and Pb2+occurred in the interlayer micropores of MB. Regarding to the chemical compatibility of MB, its free swelling index (FSI) and the hydraulic conductivity reached 85 mL/2 g and 5.87 x 10-11 m/s in deionized water, respectively. In high -concentration Cd2+ and Pb2+ solutions, MB maintained a lower permeability in the Cd2+ solution. The mech-anism can be speculated that appropriate adsorption capacity of Cd2+ by MB results in higher content of trapped polymers as polymer blockage in MB, which contributed to maintain impermeability under high-concentration heavy-metal solution.
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