不同形状TiO2纳米结构的制备、表面结构、zeta电位、表面电荷密度和光催化活性,Applied Surface Science

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不同形状TiO2纳米结构的制备、表面结构、zeta电位、表面电荷密度和光催化活性
Applied Surface Science ( IF 6.3 ) Pub Date : 2013-09-01 , DOI: 10.1016/j.apsusc.2013.04.163
Inderpreet Singh Grover , Satnam Singh , Bonamali Pal

摘要具有优异表面性能的不同形貌的钛酸钠等基于二氧化钛的纳米催化剂在光催化研究中越来越重要。尽管具有钠 (Na) 含量及其高温合成（通常会降低光反应性），但这些钛酸钠通常表现出比 P25-TiO 2 催化剂更好的光活性。因此，这项工作证明了晶体结构、BET 表面积、表面电荷、zeta 电位 (ζ) 和金属负载量对所制备的钛酸钠纳米管 (TNT) 和二氧化钛纳米棒 (TNR) 的光催化活性的影响。稻草状中空正交-TNT (Na 2 Ti 2 O 5 ·H 2 O) 颗粒（W = 9-12 nm 和 L = 82-115 nm）和米粒状纯锐钛矿-TNR 颗粒（W = 8-13 nm 和L = 81–134 nm) 是通过用 NaOH 对 P25-TiO 2 进行水热处理获得的，事实上，这改变了 TNT 和 TNR 颗粒的净表面电荷。观察到的 ζ = -2.82 (P25-TiO 2 )、-13.5 (TNT) 和 -22.5 mV (TNR) 被 Ag 和 Cu 沉积显着改变。此处已发现，TNT 在紫外线照射下对吡虫啉杀虫剂 (C 9 H 10 ClN 5 O 2 ) 降解为 CO 2 的形成显示出最佳光催化活性，因为其最大表面积为 176 m 2 g -1 。

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The preparation, surface structure, zeta potential, surface charge density and photocatalytic activity of TiO2 nanostructures of different shapes

Abstract Titania based nanocatalysts such as sodium titanates of different morphology having superior surface properties are getting wide importance in photocatalysis research. Despite having sodium (Na) contents and its high temperature synthesis (that generally deteriorate the photoreactivity), these Na-titanates often exhibit better photoactivity than P25-TiO 2 catalyst. Hence, this work demonstrated the influence of crystal structure, BET surface area, surface charge, zeta potential (ζ) and metal loading on the photocatalytic activity of as-prepared sodium titanate nanotube (TNT) and titania nanorod (TNR). Straw like hollow orthorhombic-TNT (Na 2 Ti 2 O 5 ·H 2 O) particles (W = 9–12 nm and L = 82–115 nm) and rice like pure anatase-TNR particles (W = 8–13 nm and L = 81–134 nm) are obtained by the hydrothermal treatment of P25-TiO 2 with NaOH, which in fact, altered the net surface charge of TNT and TNR particles. The observed ζ = −2.82 (P25-TiO 2 ), −13.5 (TNT) and −22.5 mV (TNR) are significantly altered by the Ag and Cu deposition. It has been found here that TNT displayed best photocatalytic activity for the imidacloprid insecticide (C 9 H 10 ClN 5 O 2 ) degradation to CO 2 formation under UV irradiation because of its largest surface area 176 m 2 g −1 among the catalysts studied.

更新日期：2013-09-01

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