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首页> 外文期刊>RSC Advances >Influence of thermal treatment and Au-loading on the growth of versatile crystal phase composition and photocatalytic activity of sodium titanate nanotubes
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Influence of thermal treatment and Au-loading on the growth of versatile crystal phase composition and photocatalytic activity of sodium titanate nanotubes

机译：热处理和金负载对钛酸钠纳米管多晶相组成生长和光催化活性的影响

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摘要

A coalescence influence of Au-loading followed by calcination at 800 degrees C led to a notable change in crystal-structure, morphology, phase composition and photocatalytic activity of titanate-nanostructures. After calcination at 800 degrees C, bare sodium titanate nanotubes (TNT) having a BET surface area (S-BET) of 176 m(2) g(-1) is transformed into sodium titanate nanorods of S-BET = 21 m(2) g(-1), whereas calcination of Au-loaded (Au+3, Au-0 and Au-nanoparticle (AuNP)) TNT at 800 degrees C led to a variety of fragmented particles having different crystal structures, S-BET (21-39 m(2) g(-1)), shape and sizes (50-75 nm), attributed to strain induced thermal decomposition of TNT after Au-loading, and the oxidation state of Au is determined by XPS analysis. The comparative photocatalytic activity of these as-prepared catalysts to that of P25-TiO2 under UV-light were evaluated for the photooxidation of the insecticide imidacloprid which gradually degraded to various intermediate photoproducts and finally decomposed to CO2. The degradation of imidacloprid follows pseudo-first order kinetics, where 0.5 wt% Au-0-deposited-TNT after calcination exhibits the highest photocatalytic activity (rate constant k = 8.9 x 10(-3) min(-1)), which is comparatively explained on the basis of their crystal phase, surface-area, morphology and the relaxation time of photoexcited electron-hole pairs, as measured by time resolved spectroscopy.
机译：Au负载的聚结影响随后在800℃下煅烧导致钛酸盐-纳米结构的晶体结构，形态，相组成和光催化活性的显着变化。在800摄氏度下煅烧后，BET表面积（S-BET）为176 m（2）g（-1）的裸钛酸钠纳米管（TNT）被转化为S-BET = 21 m（2）的钛酸钠纳米棒）g（-1），而在800摄氏度下煅烧载有Au的（Au + 3，Au-0和Au-纳米颗粒（AuNP））TNT会导致具有不同晶体结构的各种碎片颗粒，S-BET（ 21-39 m（2）g（-1））的形状和大小（50-75 nm），归因于Au加载后TNT的应变诱导热分解，并且通过XPS分析确定了Au的氧化态。评估了这些制备的催化剂与P25-TiO2在紫外光下的比较光催化活性，以评估杀虫剂吡虫啉的光氧化作用，该农药逐渐降解为各种中间光产物并最终分解为CO2。吡虫啉的降解遵循拟一级反应动力学，其中煅烧后0.5 wt％的Au-0沉积的TNT表现出最高的光催化活性（速率常数k = 8.9 x 10（-3）min（-1）），为根据时间分辨光谱法，根据它们的晶相，表面积，形态和光激发电子-空穴对的弛豫时间进行了比较解释。

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