Yulan Weng, 1 Jiulong Li, 1 Xingcheng Ding, 2 Binqiang Wang, 1 Shang Dai, 1 Yulong Zhou, 3 Renjiang Pang, 1 Ye Zhao, 1 Hong Xu, 1 Bing Tian, 1, 3 Yuejin Hua 1

1MOE Key Laboratory of Biosystems Homeostasis & Protection, Zhejiang University, Hangzhou, Peoples Republic of China; 2Zhejiang Runtu Chemical Research Institute, Shaoxing, Peoples Republic of China; 3Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang, Peoples Republic of China

Correspondence: Bing TianZhejiang University Zijingang Campus West Part, A403 Biophysics Building, 866 Yuhangtang Road, Hangzhou 310058, Peoples Republic of ChinaTel/Fax +86-571-86971215Email tianbing@zju.edu.cn

Background: Biodegradation of toxic organic dye using nanomaterial-based microbial biocatalyst is an ecofriendly and promising technique.Materials and Methods: Here, we have investigated the novel properties of functionalized Au-Ag bimetallic nanoparticles using extremophilic Deinococcus radiodurans proteins (Drp-Au-AgNPs) and their degradation efficiency on the toxic triphenylmethane dye malachite green (MG).Results and Discussion: The prepared Drp-Au-AgNPs with an average particle size of 149.8 nm were capped by proteins through groups including hydroxyl and amide. Drp-Au-AgNPs demonstrated greater degradation ability (83.68%) of MG than D. radiodurans cells and monometallic AuNPs. The major degradation product was identified as 4-(dimethylamino) benzophenone, which is less toxic than MG. The degradation of MG was mainly attributed to the capping proteins on Drp-Au-AgNPs. The bimetallic NPs could be reused and maintained MG degradation ability (> 64%) after 2 cycles.Conclusion: These results suggest that the easilyprepared Drp-Au-AgNPs have potential applications as novel nanomedicine for MG detoxification, and nanomaterial for biotreatment of a toxic polyphenyl dye-containing wastewater.

Keywords: bimetallic nanoparticles, Deinococcus radiodurans, biodegradation, toxic triphenylmethane dye, malachite green, detoxification

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Functionalized Gold and Silver Bimetallic Nanoparticles Using Deinococ | IJN - Dove Medical Press