Synthesis of TiO2NWS@AuNPS Composite Catalyst for Methylene Blue Removal

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.

One-Step Synthesis of Ag@TiO2 Nanoparticles for Enhanced Photocatalytic Performance

“…According to previous standards, 100 mg catalysts were dispersed in beaker containing 100 mL MO (20 mg/L) and the solution was thoroughly mixed for approximately 15 min. Considering the adsorption-desorption between the sample and the dye, the test solution needed to be pretreated in the dark prior to the experiment [25]. Afterwards, the suspension was stirred for 3 h under irradiation and 3 mL of the droplet was uniformly sampled at a given time interval into a tube, centrifuging for testing.…”

Preparation of a Ti0.7W0.3O2/TiO2 nanocomposite interfacial photocatalyst and its photocatalytic degradation of phenol pollutants in wastewater

“…Among oxide semiconductor photocatalysts, TiO 2 nanomaterials have been studied and applied widely in photocatalysis for their high photocatalytic activity, stability, nontoxicity and low cost. A variety of functional TiO 2 nanomaterials have been synthetized, such as nanoparticles (NPs), [4][5][6][7][8][9] nanotubes (NTs), 10,11 nanowires (NWs), [12][13][14][15] nanocrystal lms [16][17][18][19][20] and nanotube arrays, [21][22][23][24][25] which have been widely used in solar energy storage and utilization, photodegradation of pollutants and noble metal recycling.…”

“…As expected, this helped to enhance the photocatalytic efficiency of TiO 2 . [5][6][7][8][9]11,14,15,19,20,22,25,[31][32][33] However, noble metals are scarce and particularly expensive, which may limit their large-scale application. Thus, novel relatively economical photocatalysts are highly desirable.…”

Fabrication of Hybrid Polymeric Micelles Containing AuNPs and Metalloporphyrin in the Core

“…Gold nanoparticles (AuNPs), a classic inorganic nanomaterial, are particularly attractive due to their unexpected electronic and catalytic properties, as well as biocompatible nature [6,7,8]. They are widely used across a wide range of applications in the fields of catalysis, biological medicine, and explorations of new materials.…”