Effective removal and adsorption mechanism of fluoride from water by biochar-based Ce(III)-La(III)-crosslinked sodium alginate hybrid hydrogel

作     者：Zhou, Xueying Li, Beigang Zhao, Qiange 

作者机构：Inner Mongolia Normal Univ Chem & Environm Sci Coll Hohhot Peoples R China Inner Mongolia Key Lab Environm Chem Hohhot 010022 Peoples R China 

出 版 物：《INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES》 (国际生物大分子杂志)

年 卷 期：2024年第272卷第Part1期

页      面：132925页

核心收录：

学科分类：0710[理学-生物学] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：National Natural Science Foundation of China Natural Science Foundation of Inner Mongolia Autonomous Region, China [2020LH02009] Collab- orative Innovation Center for Water Environment Security of Inner Mongolia Autonomous Region, China [XTCX003] Fundamental Research Funds for the Inner Mongolia Normal University [2022JBTD009] 

主　　题：Biochar Hybrid hydrogel F ions 

摘      要：An eco-friendly macroparticle biochar (BC)-based Ce(III)-La(III) crosslinked sodium alginate (SA) hybrid hydrogel (BC/Ce-SA-La) was synthesized by droplet polymerization and characterized by SEM-EDS, XRD, FTIR, UV-Vis and XPS. The effects of dosage, pH, contact time, temperature and coexisting ions on the F- ions removal by hybrid hydrogel, and the adsorption performance, interaction mechanism and reusability were investigated. The results demonstrate that the composite has a fancy wrinkle structure with a particle size of about 1.8 mm and abundant porosity on the surface. The removal rate of F- ions by BC/Ce-SA-La reached 90.2 % under the conditions of pH 2.0, 200 min of contact time and 298 K. The adsorption behavior was perfectly explained by Langmuir model, and the maximum adsorption capacity reached 129 mg/g. The adsorption process was an endothermic spontaneous reaction and followed Pseudo-second-order rate model. The strong adsorption was attributed to multi-interactions including complexation, hydrogen bonding and electrostatic adsorption between the composite and F- ions. Coexisting ions hardly interfered with the adsorption of F- ions by BC/Ce-SA-La except for a slight effect of phosphate. The composite after F- ion adsorption was easily separated and could be reused at least three times. BC/Ce-SA-La is a cost-effective and promising granular biosorbent.