期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 166, 期 -, 页码 390-400出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2018.09.097
关键词
Auricularia auricula spent substrate (AASS); Cetyl trimethyl ammonium bromide (CTAB) modification; Coexisting ions; Competitive adsorption
资金
- National Key Research Project of China [2017YFD0801104]
- research project of Post-doctoral Mobile Station Ecology, Northeast Agricultural University
In this paper, the effect of coexisting cations and anions on Cr(VI)(in the form of Cr2O72-) adsorption onto Auricularia auricula spent substrate (AASS) modified by cetyl trimethyl ammonium bromide (CTAB) was investigated in batch adsorption experiment. The Cr(VI) adsorption capacity of 9.327 mg/g, obtained at pH 3.0, 303 K, adsorbent dosage of 2 g/L, initial Cr(VI) concentration of 20 mg/L, rotational speed of 150 r/min for 120 min, was decreased in the presence of coexisting cations and anions, among which Pb2+ and PO43- affected most by 2L79% and 12.43%, respectively. XRD, XPS and FTIR detection found that coexisting Pb2+ and PO43- would not only interfere Cr(VI) to form crystals and reduce to Cr(III), but also compete with Cr(VI) for oxygen containing and amino groups to form Pb-O and P-NH2, respectively. In addition, the single Cr(VI) adsorption fitted with Langmuir isotherm model, while the competitive adsorption was well described by Freundlich isotherm model. Both single adsorption and competitive adsorption were in line with the pseudo-second-order kinetic model.
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