Photoinduced charge property of nanosized perovskite-type LaFeO3 and its relationships with photocatalytic activity under visible irradiation
Photoinduced charge property of nanosized perovskite-type LaFeO3 and its relationships with photocatalytic activity under visible irradiation
复制标题
可见光照射下纳米钙钛矿型LaFeO3的光生电荷特性及其与光催化活性的关系
DOI：
10.1016/j.materresbull.2006.06.010
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发表时间：
2007-02-15
影响因子：
5.4
通讯作者：
Fu, Honggang
中科院分区：
文献类型：
--
作者：
Li, Shudan;Jing, Liqiang;Fu, Honggang
本文以柠檬酸(HOOCCH2C（OH)(COOH)CH2COOH）为络合剂，以La(NO3)(3)中心点6H(2)O和Fe (NO3)(3)中心点9H(2)O为原料，采用溶胶-凝胶法制备了ABO(3)型钙钛矿LaFeO3纳米光催化剂。采用热重-差热分析（TG-DTA）、x射线粉末衍射（XRD）、Brunauer-Emmett-Teller （BET）、红外光谱（IR）、紫外-可见漫反射光谱（UV-vis DRS）、光致发光光谱（PL）、表面光电压光谱（SPS）和电场诱导表面光电压光谱（EFISPS）等测试技术对制备的样品进行了表征。考察了不同LaFeO3纳米颗粒在可见光照射（λ > 400 nm）下对罗丹明B溶液的降解活性。主要研究了热处理温度对光诱导电荷性质和光催化活性的影响及其相互关系。结果表明，500℃煅烧后的LaFeO3样品具有较高的活性，且活性随煅烧温度的升高而降低，与表征结果吻合较好。PL和SPS信号越弱，光催化活性越高。此外，所有制备的LaFeO3样品在可见光照射下的活性均高于国际P-25 TiO2。(c) 2006 Elsevier Ltd.版权所有。
In this paper, ABO(3)-tYPe perovskite LaFeO3 nanosized photocatalysts were synthesized by a sol-gel method, using citric acid (HOOCCH2C(OH)(COOH)CH2COOH) as complexing reagent and La(NO3)(3)center dot 6H(2)O and Fe (NO3)(3)center dot 9H(2)O as raw materials. The as-prepared samples also were characterized by several testing techniques, such as thermogravimetry-differential thermal analysis (TG-DTA), X-ray powder diffraction (XRD), Brunauer-Emmett-Teller (BET), infrared spectrum (IR), ultraviolet-visible diffuse reflection spectrum (UV-vis DRS), photoluminescence spectrum (PL), surface photovoltage spectroscopy (SPS) and electrical field induced surface photovoltage spectroscopy (EFISPS). The sample activity of different LaFeO3 nanoparticles for degrading Rhodamine B solution under visible irradiation (lambda > 400 nm) was evaluated. The effects of thermal treatment temperature on photoinduced charge property and photocatalytic activity were mainly investigated, together with their relationships. The results show that the LaFeO3 sample calcined at 500 degrees C exhibits higher activity, and the activity decreases with increasing calcination temperature, which is in good agreement with the characterization results. The weaker is the PL and SPS signal, the higher is the photocatalytic activity. Moreover, the activity of all as-prepared LaFeO3 samples is higher than that of international P-25 TiO2 under visible irradiation. (c) 2006 Elsevier Ltd. All rights reserved.