UV and visible light photocatalytic activity of Au/TiO2 nanoforests with Anatase/Rutile phase junctions and controlled Au locations

Abstract

To magnify anatase/rutile phase junction effects through appropriate Au decorations, a facile solution-based approach was developed to synthesize Au/TiO2 nanoforests with controlled Au locations. The nanoforests cons®isted of anatase nanowires surrounded by radially grown rutile branches, on which Au nanoparticles were deposited with preferred locations controlled by simply altering the order of the fabrication step. The Au-decoration increased the photocatalytic activity under the illumination of either UV or visible light, because of the beneficial effects of either electron trapping or localized surface plasmon resonance (LSPR). Gold nanoparticles located preferably at the interface of anatase/rutile led to a further enhanced photocatalytic activity. The appropriate distributions of Au nanoparticles magnify the beneficial effects arising from the anatase/rutile phase junctions when illuminated by UV light. Under the visible light illumination, the LSPR effect followed by the consecutive electron transfer explains the enhanced photocatalysis. This study provides a facile route to control locations of gold nanoparticles in one-dimensional nanostructured arrays of multiple-phases semiconductors for achieving a further increased photocatalytic activity.

Dual Functionality of TiO2/Biochar Hybrid Materials: Photocatalytic Phenol Degradation in the Liquid Phase and Selective Oxidation of Methanol in the Gas Phase

“…All photocatalytic reactions were carried out in a Pyrex cylindrical double-walled immersion To investigate the effects of active species generated during the photocatalytic reaction using TiO2/SWP700 under UV and Visible illumination, free radicals capture experiments were conducted. [36][37] The three major oxidants involved in photodegradations of organics in water, that is, hydroxyl radical (OH • ), hole (h + ), and superoxide radical (O2 •− ), were trapped by adding 0.5 mL of tert-butanol (t-BuOH), 0.1 mM of ammonium oxalate (AO), and 0.5 mM of 1,4-benzoquinone (BQ), respectively, into the phenol solutions (see Supplementary Information, Fig. S3).…”

Preparation and iodine labeling properties of nanophotosensitizer NaYF<sub>4</sub>:Yb,Tm@NaGdF<sub>4</sub>:Yb@SiO<sub>2</sub>@TiO<sub>2</sub>-Au

“…中电子-空穴对的生成速率 [14,15] , 拓展光催化剂的光响 [16] . 作为一种核医学成像 技术, SPECT具有优异的成像灵敏度, 在精确监测分子 影像探针在肿瘤组织处的富集与代谢变化方面显著优 于CT或MRI技术 [17] .…”

Enhanced and ultrafast dye contaminated wastewater remediation using molybdenum doped bismuth ferrite nanoparticles

“…food, textile, pharmaceuticals. These organics dyes are considered to be one of the most common sources of water pollution due to their non-biodegradability and high toxicity level towards a human being and aquatic creatures [1][2][3]. Therefore, the degradation of these dyes in an ecofriendly and energy efficient manner received widespread attention all over the world.…”