期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 607, 期 -, 页码 1963-1972出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.10.014
关键词
Cr(VI); Adsorption; Hydrothermal; In situ polymerization; LDHs
CAL and CAL-PPy were prepared to efficiently remove high concentrations of Cr(VI) wastewater, with CAL-PPy showing improved adsorption performance due to increased specific surface area. The mechanisms involved electrostatic attraction, surface complexation, anion exchange, and reduction to low-toxicity Cr(III).
To efficiently remove high concentrations of hexavalent chromium (Cr(VI)), calcium-aluminum-layered double hydroxide (CaAI-LDH, denoted as CAL), and polypyrrole-modified CAL (CAL-PPy) were prepared by hydrothermal and in situ polymerization methods, respectively. The chemical structure, morphology, and elemental results indicated that the chain-like polypyrrole was decorated with hexagonal CAL. The specific surface area of CAL-PPy increased from 8.746 m(2)/g to 24.24 m(2)/g. The adsorption performances of CAL and CAL-PPy for aqueous Cr(VI) were investigated using batch equilibrium experiments. The decontamination process of aqueous Cr(VI) (100 mg/L) reached the equilibrium state within 50 min, and the kinetic data met the pseudo-second-order kinetic equation. The Langmuir model described the isothermal data properly, and the obtained theoretical adsorption capacity of CAL for Cr(VI) at 318 K was 34.06 mg/g, while that of CAL-PPy was 66.14 mg/g. The removal mechanisms involved electrostatic attraction, surface complexation, anion exchange, and reduction to low-toxicity Cr(III). Therefore, CAL and CAL-PPy have underlying applications in treating real wastewater containing Cr(VI). (C) 2021 Elsevier Inc. All rights reserved.
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