Abstract
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.
Highlights
The constant increase in environmental pollution has raised public concern in recent years.Anthropogenic pollution has so far exceeded the acceptable safety levels to the environment to become dangerous to human health [1,2]
Transmission electron microscopy (TEM), selected area electron diffraction (SAED), high-resolution electron microscopy (HRTEM) and EDS spectra Ti catalysts were performed on a Tecnai G20 microscope (FEI Company, Hillsboro, OR, USA) operating at 200 kV and equipped with both energy dispersive X-ray spectroscopy system and SIS CCD camera for digital imaging
The initial concentration of methylene blue (MB) was set to 10 mg/L, and catalysts were exposed to UV light (20 W black-light-blue lamp)
Summary
The constant increase in environmental pollution has raised public concern in recent years. Printing and dyeing wastewaters and heavy metal wastewaters count for more than 70% of all world annual wastewaters This is far higher in comparison with other pollutions. Other materials such as surface precious metal deposition and semiconductors compounding have been tested [12,13,14]. Precious metal-based catalysts have been the subject of great interest for eliminating pollution due to their high activities and superior stabilities, despite their cost. Our group designed poly amide network polymer (HBP-NH2 ) with reticulated porous cavity, which is promising for excellent nanometer reaction container for controlling morphology and size of nanomaterials This method was applied to the synthesis of silver nanoparticles [26,27]. The effect of exposure to UV light, TiO2 and amount of Au deposited on TiO2 surface on catalyst performance were investigated and the results were discussed
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