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- Title
Bentonite/Sesbania Gum Hydrogel for Effective Removal of Cationic Dyes: Network Structure Construction and the Role of Multiple Hydroxyl and Carboxyl Adsorption Sites.
- Authors
Jiang, Luying; Yu, Sishan; Zhang, Jingwei; Xu, Zisong; Tang, Rui; Wang, Yinlong; Liang, Ke; Zhai, Chen; Tong, Zhangfa; Zhang, Hanbing
- Abstract
Effective hydrogel adsorbents are widely used in toxic dyes removal, but weak toughness and inferior adsorption performance limit their actual application. Herein, a dual-functionalized epoxy and amino groups hyperbranched polysiloxane (HPSi) cross-linker was initially developed, bentonite (BT) was incorporated with sesbania gum (SG), acrylic acid/acrylamide (AA/AAm) was utilized as monomers to synthesize hydrogel adsorbent H-SG/BT(AA/AAm) for the adsorption of methylene blue (MB) and malachite green (MG). Various characterization techniques, adsorption parameters test and mechanism analysis demonstrated that HPSi and BT endowed H-SG/BT(AA/AAm) with enhanced mechanical strength (tentative extensibility of 2645% and elastic recovery was over 90%). The hydroxyl of BT and SG was completely insert into the hydrogel then significantly enhanced the swelling and adsorption capacity. H-SG/BT(AA/AAm) exposed a promising adsorption capacity towards MB and MG with maximum adsorption capacity of 1226 mg/g and 783 mg/g. Kinetic and isotherm studies indicated that the adsorption of MB and MG onto H-SG/BT (AA/AAm) closely followed the pseudo-second-order kinetic model and Langmuir isotherm. The adsorption efficiency of H-SG/BT (AA/AAm) for MB and MG could still reach 80% after five adsorption–desorption cycles. Clearly, H-SG/BT(AA/AAm) composites can be effectively utilized as an eco-friendly adsorbent for dyes adsorption in aqueous environments. Highlights: H-SG/BT(AA/AAm) was successfully synthesized by hyperbranched polysiloxane (HPSi) crosslinker. HPSi and BT enhanced the mechanical properties of H-SG/BT(AA/AAm). SG and BT synergistically enhance the adsorption performance of H-SG/BT(AA/AAm). H-SG/BT(AA/AAm) exhibits high adsorption capacity for MB and MG. The adsorption mechanism of H-SG/BT(AA/AAm) was proposed.
- Subjects
BASIC dyes; SESBANIA; BENTONITE; HYDROGELS; ACRYLIC acid; MALACHITE green
- Publication
International Journal of Environmental Research, 2024, Vol 18, Issue 5, p1
- ISSN
1735-6865
- Publication type
Article
- DOI
10.1007/s41742-024-00624-3