期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 24, 期 21, 页码 17626-17641出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-017-9326-5
关键词
Auricularia auricula spent substrate (AASS); Cr(VI); Didodecyldimethylammonium bromide(DDAB) modification; Biosorption condition; Biosorption mechanism
资金
- Natural Science Foundation of Heilongjiang Province, China [D201402, D2016001]
- research project of the Post-doctoral Mobile Station Ecology, Northeast Agricultural University
Auricularia auricula spent substrate (AASS) modified by didodecyldimethylammonium bromide(DDAB) was used as adsorbent to remove Cr(VI) from aqueous solution. Based on a single-factor experiment and response surface methodology, the optimal conditions were adsorbent dosage of 1.5 g/L, pH value of 4.0, initial Cr(VI) concentration of 19 mg/L, temperature of 25 degrees C, biosorption time of 120 min, rotational speed of 150 r/min, respectively, under which biosorption capacity could reach 12.16 mg/g compared with unmodified AASS (6.058 mg/g). DDAB modification could enlarge the specific surface area and porous diameter of the adsorbents, and supply hydrophilic and hydrophobic groups capable of adsorbing at the interfaces. In addition, DDAB increased ionic exchange and complex formation demonstrated by variations of elemental contents, shifts of carboxyl, amine groups, hydroxyl, alkyl chains, and phosphate groups as well as the crystal structure of the Cr-O compounds. Variations of peaks and energy in XPS analysis also testified the reduction of Cr(VI) to Cr(III).The biosorption behavior of modified AASS was in line with Langmuir and Freundlich isotherm equation. The final regeneration efficiency was 62.33% after three biosorption-desorption cycles. Apparently, DDBA is a eximious modifier and DDBA-modified AASS was very efficient for Cr(VI) removal.-.
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