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Biosynthesis of β-cyclodextrin modified Schwertmannite and the application in heavy metals adsorption

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成果类型:
期刊论文
作者:
ShengjieSun;JianyuZhu;ZhiheZheng;JiayuLi;MinGan
作者机构:
School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China
School of Minerals Processing and Bioengineering, Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
Advanced Water Management Centre, The University of Queensland, St. Lucia, Queensland 4072, Australia
语种:
中文
关键词:
Schwertmannite;β-Cyclodextrin;Adsorption;Heavy metals;Environmental materials
期刊:
Powder Technology
ISSN:
0032-5910
年:
2019
卷:
342
页码:
181-192
机构署名:
本校为第一机构
院系归属:
材料科学与工程学院
资源加工与生物工程学院
摘要:
β-cyclodextrin modified Schwertmannite has been successfully biosynthesized by Acidithiobacillus ferrooxidans in this study. Three main parts in this experiment are as follows: characterisation, adsorption measurements and mechanisms exploration. The stability of micro-sphere structure was reduced with β-cyclodextrin modification, while the functional groups was enhanced by β-cyclodextrin. In addition, the adsorption capabilities of Schwertmannite, formed in oversaturated β-cyclodextrin, were improved by 20.66% for Cu(II) and 14.82% for Cr(VI) respectively. However, the improvement of Cu(II) was associated with decreasing adsorption rates while that of Cr(VI) was companied with increasing rates. Both metal adsorptions can be roughly regarded as two adsorption phases: surface adsorption and the migration of metal ion in channels inside Schwertmannite. In binary metal solutions with high concentration, modified Schwertmannite materials showed distinct affinity to Cr(VI) instead of Cu(II). In terms of mechanisms, Cu(II) adsorption depended on the H+ exchange and Cr(VI) relied on the ligand exchange, such as SO42−.

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