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Synthesis of TiO2NWS@AuNPS Composite Catalyst for Methylene Blue Removal

by Fan Fu 1, Feifei Wang 1, Ting Li 1, Chenlu Jiao 1, Yan Zhang 1,2,* and Yuyue Chen 1,*
1
National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China
2
Nantong Textile & Silk Industrial Technology Research Institute, Nantong 226314, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(6), 1022; https://doi.org/10.3390/ma11061022
Received: 7 May 2018 / Revised: 11 June 2018 / Accepted: 11 June 2018 / Published: 15 June 2018
In this article, HBP-NH2-modified titania nanowire (TiO2NWS)-decorated Au nanoparticles (TiO2NWS@AuNPS) were synthesized by one-step method. The role of HBP-NH2 concentration in the formation of TiO2NWS was investigated. The fineness and uniformity of pure TiO2NWS were enhanced by absorbed amino groups from amino-terminated hyperbranched polymer (HBP-NH2). The morphology and crystal structure of TiO2NWS and TiO2NWS@AuNPS were examined by transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fournier transform infrared (FTIR) spectroscopy. The chemical states of gold, titanium and oxygen were analyzed by X-ray photoelectron spectroscopy (XPS). The results showed that at the concentration of HBP-NH2 100 g/L, the mean diameter of TiO2NWS was nearly 72 nm and Au nanoparticles were uniformly distributed on the surface of TiO2NWS. The presence of AuNPS improved the photocatalytic properties of TiO2NWS under UV light irradiation. The Au load was believed to improve the utilization rate of the photoelectron and activated the adsorbed oxygen. The obtained TiO2NWS@AuNPS decomposed 99.6% methylene blue (MB) after 300 min when subjected to UV light irradiation. After five cycles of the catalyzing process, the TiO2NWS@AuNPS still retained over 90% of its catalytic ability for MB. The Au deposition was found responsible for the high catalytic activity of TiO2NWS@AuNPS. View Full-Text
Keywords: TiO2NWS@AuNPS composite; one step synthesis; catalysis; methylene blue degradation TiO2NWS@AuNPS composite; one step synthesis; catalysis; methylene blue degradation
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Fu, F.; Wang, F.; Li, T.; Jiao, C.; Zhang, Y.; Chen, Y. Synthesis of TiO2NWS@AuNPS Composite Catalyst for Methylene Blue Removal. Materials 2018, 11, 1022.

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