Adsorption Removal of Multiple Dyes Using Biogenic Selenium Nanoparticles from an Escherichia coli Strain Overexpressed Selenite Reductase CsrF

被引：30

作者：

Xia, Xian ^{[1
]}

Zhou, Zijie ^{[1
]}

Wu, Shijuan ^{[1
]}

Wang, Dan ^{[1
]}

Zheng, Shixue ^{[1
]}

Wang, Gejiao ^{[1
]}

机构：

[1] Huazhong Agr Univ, Coll Life Sci & Technol, State Key Lab Agr Microbiol, Wuhan 430070, Hubei, Peoples R China

来源：

NANOMATERIALS | 2018年 / 8卷 / 04期

基金：

中国国家自然科学基金;

关键词：

CsrF; Bio-SeNPs; anionic dye; cationic dye; adsorption; AQUEOUS-SOLUTION; ACTIVATED CARBON; SAFRANIN-T; WASTE; VALORISATION; ADSORBENTS; DESORPTION; PROTEINS;

D O I：

10.3390/nano8040234

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Selenite reductase CsrF overexpressed Escherichia coli was used as a microbial factory to produce Se(0) nanoparticles (Bio-SeNPs). The Bio-SeNPs were characterized by transmission electronic microscopy, element mapping, scanning electron microscopy, energy-dispersive X-ray spectrographs, Zeta-potential, dynamic light scattering, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses. The results indicated that Bio-SeNPs are irregular spheres with diameters from 60 to105 nm and mainly consist of Se(0), proteins and lipids. Furthermore, it exhibited maximum adsorption capacity for anionic dye (congo red) at acidic pH and cationic dyes (safranine T and methylene blue) at alkaline pH. To gain more insight, adsorption kinetics, adsorption isotherms and adsorption thermodynamics studies were carried out. These results showed that the adsorption capacities of congo red, safranine T and methylene blue were 1577.7, 1911.0 and 1792.2 mg/g, respectively. These adsorption processes were spontaneous and primarily physical reactions. In addition, Bio-SeNPs can be effectively reused by 200 mmol/L NaCl. To the best of our knowledge, this is the first report of adsorption removal dyes by Bio-SeNPs. The adsorption capacities of Bio-SeNPs for congo red, safranine T and methylene blue were 6.8%, 25.2% and 49.0% higher than that for traditional bio-based materials, respectively.

引用

页数：15

共 48 条

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