The catalysis biodecolorization characteristics of novel recyclable insoluble redox mediators onto magnetic nanoparticles

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Journal Article
Desalination and Water Treatment, 2018, 107 pp. 62 - 71
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© 2018 Desalination Publications. All rights reserved. The insoluble redox mediators (RMs) were prepared to overcome limitations of soluble RMs that are eluted with water flow in wastewater treatment process. Magnetic nanoparticles possess good performance, due to their high specific surface area, the absence of internal diffusion resistance and easy separation in presence of an external magnetic field. In this study, insoluble RMs were prepared by immobilizing anthraquinone-2-sulfate (AQS) onto magnetic nanoparticles. AQS modified magnetic nanoparticles (FeSi@AQS) were formed by chemical reaction between the sulfochlorides group of anthraquinone-2-sulfonyl choride and amino-modified magnetic nanoparticles, with formation confirmed by Fourier transform infrared spectra. Results of energy dispersive X-ray and thermal grav-imetric analysis showed that AQS occupied a 21.47 wt.% proportion of the FeSi@AQS complex. FeSi@ AQS was used as insoluble RMs to catalyze biodecolorization of several kinds of azo dyes. When the concentration of FeSi@AQS was as low as 40 mg/L, biodecolorization rate of reactivered K-2BP was increased by 2.18-fold. FeSi@AQ Scan then be separated and gathered from wastewater by magnetic attraction and reused for further catalysis of azo dye decolorization in a modified SBR system. These findings show that the immobilization of RMs on magnetic nanoparticle surfaces, benefits potential industrial applications of RMs.
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