In-situ deposition of gold nanoparticles onto polydopamine-decorated g-C3 N4 for highly efficient reduction of nitroaromatics in environmental water purification

Journal of Colloid and Interface Science
Lei QinXiaofeng Wen

Abstract

A green synthesized gold-catalyst (PDA-g-C3N4/Au) for highly efficient reduction of nitroaromatics by NaBH4 was proposed. Polydopamine (PDA) served as the reductant and stabilizer for AuNPs reduction, avoiding the use of chemical reductant and stabilizer that may result in secondary contamination. g-C3N4 not only acted as the support but also provided compatibility for AuNPs deposition, enhancing the stability and deposition of AuNPs, which improved the catalytic activity. Different experimental parameters including the amount of Au loading, concentration of NaBH4, and dosage of catalyst were studied. Results showed that PDA-g-C3N4/Au(3) revealed higher catalytic activity with a rate constant of 0.0514 s-1 and TOF of 545.60 h-1 for 4-NP reduction. In addition, the catalyst was highly efficient in reduction of other nitroaromatics and the reduction rates of these compounds were found as the sequence: methyl orange > 2-nitrophenol > 2, 4-dinitrophenol > Erichrome Black T > Congo red. Moreover, the PDA-g-C3N4/Au(3) catalyst kept high stability and excellent conversion efficiency over ten reduction cycles. The practical application on different real water samples suggests that this Au catalyst has promising application in environme...Continue Reading

Citations

Mar 29, 2019·Biotechnology and Applied Biochemistry·Nasim MalekiNahid Shahabadi
Jan 11, 2020·Chemical Society Reviews·Xiao WangHongjie Zhang
Sep 13, 2020·Environmental Science and Pollution Research International·Maojuan BaiJun Wan
Oct 8, 2020·Environmental Science and Pollution Research International·Mohammad HassanpourHossein Safardoust-Hojaghan

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