期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 26, 期 5, 页码 5094-5110出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-3989-4
关键词
Heavy metal; Chelation; Electrostatic attraction; Adsorbent; Multi-component; Wastewater treatment
资金
- National Natural Science Foundation of China [41562012]
In this study, the novel adsorbent PVA-TA-beta CD was synthesized via thermal cross-linking between polyvinyl alcohol and beta-cyclodextrin. The characterization methods SEM-EDS, FTIR, and XPS were adopted to characterize the adsorbent. The effect of pH, contact time, initial concentrations, and temperature during the adsorption of Pb(II), Cd(II), and Mn(II) onto the PVA-TA-beta CD was also investigated. In a single-component system, the data fitted well to pseudo-second-order, and film diffusion and intra-particle diffusion both played important roles in the adsorption process. As for isotherm study, it showed a heterogeneous adsorption capacity of 199.11, 116.52, and 90.28 mg g(-1) for the Pb(II), Cd(II), and Mn(II), respectively. Competition between the ions existed in a multi-component system; however, owing to the stronger affinity of the PVA-TA-beta CD for Pb(II) relative to Cd(II) and Mn(II), the Pb(II) adsorption onto the PVA-TA-beta CD was less affected by the addition of the other metals, which could be effectively explained by the hard and soft acid and base theory (HSAB). Furthermore, PVA-TA-beta CD showed good reusability throughout regeneration experiments.
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