Enhanced Treatment of Anionic and Cationic Dyes in Wastewater through Live Bacteria Encapsulation Using Graphene Hydrogel

Liang Shen, Ziheng Jin, Wenhao Xu, Xia Jiang, Yue Xiao Shen, Yuanpeng Wang, Yinghua Lu

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Organic dyes have been considered as persistent pollutants to the water environment and remain a challenge for industrial wastewater treatment. Here we integrated environmental biotechnology and adsorption technique into a highly porous, reactive hydrogel based material composed of live Shewanella xiamenensis BC01 encapsulated within reduced graphene oxide network (BC01-BGH). Because of the synergetic effects of adsorption and biodegradation, BC01-BGH showed exceptional decolorization performance of decomposing model anionic and cationic dyes, i.e., Congo red (CR) and methylene blue (MB), with efficiencies up to 99.8 and 97.3% in 55 h, respectively. Through a series of characterizations along the degradation process, we found that the hydrogel network provided universal adsorption to those dyes via joint electrostatic interaction, chemical interaction and π-πinteraction with the assistance of the immobilized BC01, leading to the enhanced decolorization. The system did not require additional carbon sources and the resulting products, basically benzidine and anilines, were readily oxidized by ClO2 to a COD level below 60 mg/L. These results help bridge the knowledge gap of the bacteria encapsulation as a potential scale-up technology to clean up various dyes in wastewaters.

Original languageEnglish
Pages (from-to)7817-7824
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume58
Issue number19
DOIs
StatePublished - May 15 2019

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