Biosynthesis of gold nanoparticles using fungus Trichoderma sp. WL-Go and their catalysis in degradation of aromatic pollutants

• Published in: IET nanobiotechnology 2019-02, Vol.13 (1), p.12-17
• Main Authors: Qu, Yuanyuan, Li, Xuanying, Lian, Shengyang, Dai, Chunxiao, Jv, Ziyi, Zhao, Bo, Zhou, Hao
• Format: Article
• Language: English
• Subjects: 2‐nitroaniline; 2‐nitrophenol; 3‐nitroaniline; 3‐nitrophenol; 4‐nitrophenol; aromatic pollutants degradation; as‐synthesised AuNPs; azo dye decolourisation; catalysis; catalysts; catalytic activities; catalytic performance; catalytic rate constants; cell‐free extracts; characteristic absorption band; decolourisation efficiency; dyes; efficient catalytic capability; efficient green method; fungus Trichoderma sp. WL‐Go; gold; Gold - chemistry; gold nanoparticles biosynthesis; Green Chemistry Technology; green gentle method; Metal Nanoparticles - chemistry; microorganisms; nanobiotechnology; nanofabrication; nanoparticles; Nitrophenols - chemistry; Nitrophenols - isolation & purification; Nitrophenols - metabolism; nitro‐aromatics; Particle Size; pollution control; protein; proteins; reduction (chemical); Research Article; transmission electron microscopy; transmission electron microscopy images; Trichoderma - chemistry; Trichoderma - metabolism; ultraviolet spectra; UV–Vis spectra; visible spectra; Water Pollutants - chemistry; Water Pollutants - isolation & purification; Water Pollutants - metabolism
• ISSN: 1751-8741; 1751-875X; 1751-875X
• DOI: 10.1049/iet-nbt.2018.5177

An efficient green method of gold nanoparticles (AuNPs) biosynthesis was achieved by cell-free extracts of fungus Trichoderma sp. WL-Go. Based on UV–Vis spectra, AuNPs biosynthesised by cell-free extracts with 90 mg/l protein exhibited a characteristic absorption band at 556 nm and was stable for 7 days. Transmission electron microscopy images revealed that the as-synthesised AuNPs were spherical and pseudo-spherical, and the average size was calculated to be 9.8 nm with a size range of 1–24 nm. The AuNPs illustrated their good catalytic activities for reduction of nitro-aromatics (2-nitrophenol, 3-nitrophenol, 4-nitrophenol, 2-nitroaniline, 3-nitroaniline) with catalytic rate constants of 7.4 × 10−3 s−1, 10.3 × 10−3 s−1, 4.9 × 10−3 s−1, 5.8 × 10−3 s−1, 15.0 × 10−3 s−1, respectively. Meanwhile, the AuNPs also showed excellent catalytic performance in decolourisation of azo dyes with decolourisation efficiency from 82.2 to 97.5%. This study provided a green gentle method for AuNPs synthesis as well as exhibiting efficient catalytic capability for degradation of aromatic pollutants.