共查询到17条相似文献,搜索用时 78 毫秒
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二氧化钛光催化降解活性染料废水的研究进展 总被引:12,自引:0,他引:12
综述了二氧化钛光催化降解活性染料废水的研究成果,对影响二氧化钛光催化降解活性染料废水的各种因素(如催化剂的形态、溶液的pH值、光源与光照强度和溶液中其它物质等)及光催化降解动力学行为进行了讨论,并提出了今后的研究方向。 相似文献
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活性染料废水的半导体光催化降解研究 总被引:6,自引:0,他引:6
研究了染料活性红X3B,活性黄X6G,活性兰XBR的TiO2光催化降解特性,表明均动力学一级反应,同时研究了比较了ZnS的光催化特性,结果表明ZnS对活性染料也具有一定的脱色效果。 相似文献
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TiO2,WO3对活性染料水溶液的光催化降解 总被引:7,自引:0,他引:7
本文试验研究采用TiO_2、WO_3对活性染料水溶液光催化降解,试验结果表明在光辐照下两种催化剂对活性艳蓝X-BR染料的降解都起作用,而TiO_2比WO_3的作用效果更好。预示了采用该方法处理染料废水的光明前景 相似文献
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甲苯的光催化降解及其动力学研究 总被引:1,自引:0,他引:1
进行了以自制锐钛型Fe3+-TiO2催化降解甲苯的研究,在自制的光催化反应器中,室温下以40 W白炽灯为光源,分析了TiO2的掺Fe3+量、催化剂投放量、甲苯初始浓度和溶液初始pH等因素的影响.结果表明:自制锐钛型Fe3+-TiO2能较有效地催化降解甲苯.在pH为2,TiO2掺Fe3+量为5%(物质的量分数)、催化剂投放量为2.0 g/L时对1.2 g/L甲苯的去除率在5h内可达60%以上.甲苯的降解过程表现为一级反应,表观反应速率常数k为0.0666 h-1,反应可用Langmuir-Hinshelwood动力学方程描述. 相似文献
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水中氯仿的非均相光催化降解反应动力学研究 总被引:6,自引:0,他引:6
应用PCR-RFLP法检测了20例正常大肠粘膜、30例大肠腺瘤、74例大肠腺癌及74例癌旁粘膜ras,P^53基因点突变。结果显示,正常大肠粘膜及癌旁粘膜及癌旁粘膜未检测到基因突变,大肠腺瘤及腺癌ras基因突变率分别为26.7%及41.9%,且ras基因突变率随腺瘤大小及不典型增生程度增高而增高。大肠腺瘤腺癌P^53基因突变率分别为1.3%及14.9%。1例腺瘤、6例腺癌存在ras及P^53两种基 相似文献
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通过使用自制的光催化剂(二氧化钛、三氧化钨)分别负载在玻纤上,对甲醛气体进行光催化降解。以动态法考察了温度、湿度对光催化降解甲醛的影响。实验结果表明:随着温度、湿度的升高,光催化降解甲醛气体的降解率先升高后降低。最佳反应条件为:反应温度38℃,反应湿度40%,以WO3/TiO2/玻纤为光催化剂,甲醛降解率达到76%。并对WO3/TiO2/玻纤光催化降解甲醛的反应动力学进行了初步研究,结果表明:以WO3/TiO2/玻纤为光催化剂,光催化降解甲醛反应符合一级反应动力学规律。 相似文献
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二氧化钛粉体光催化降解印染废水的研究 总被引:15,自引:0,他引:15
采用溶胶-凝胶法制备TiO2粉体,研究TiO2粉体光催化降解印染废水的可行性和影响因素。结果表明,CODC r为268 mg/L的印染废水,用125 W荧光灯照射2 h,脱色率为96%,CODC r去除率为86%。酸度、TiO2用量、光照距离、光照时间等多种因素对光催化降解印染废水效果均有一定影响。同时做了TiO2回收试验,结果表明,TiO2催化性能比较稳定,可重复使用,且脱色率及COD去除率较高。 相似文献
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Wenbing Zhang Taicheng An Mingchao Cui Guoying Sheng Jiamo Fu 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2005,80(2):223-229
The effects of various anions, Cl?, ClO4?, SO42?, NO3?, HCO3?, H2PO4? and C2O42?, on the photocatalytic and photoelectrocatalytic degradation of reactive Brilliant Orange K‐R have been investigated in a packed‐bed photoelectrocatalytic reactor. It was found that the nature and concentrations of these inorganic anions significantly affected the photocatalytic and photoelectrocatalytic degradation performance of the reactive dye. The results indicated that the external electric field was successfully applied to improve the photocatalytic efficiency of reactive Brilliant Orange K‐R in the presence of Cl?, especially at higher concentrations, while other inorganic anions displayed more or less negative effects on the degradation of the dye. The strongest inhibition effect on photocatalytic and photoelectrocatalytic degradation of the dye was observed in the presence of HCO3? ions. Copyright © 2004 Society of Chemical Industry 相似文献
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光催化降解是一种有效的处理环境污染物的方法。氯氧化铋(BiOCl)已成为传统光催化剂的潜在替代品,并显示出优异的性能。采用简单的机械搅拌法合成了BiOCl光催化剂,并通过扫描电镜(SEM)、透射电镜(TEM)、红外光谱(FT-IR)、X射线衍射(XRD)、X射线光电子能谱(XPS)、氮气吸附-脱附和紫外-可见漫反射光谱(UV-Vis DRS)等对其形貌、组成、结构、比表面积以及光学性能进行了表征。结果显示,制备的BiOCl显示出二维纳米薄片状形貌,带隙宽度为3.3 eV。利用光催化降解对硝基苯酚(PNP)为模拟反应评估了BiOCl的光催化活性。受益于BiOCl表面高暴露的(110)晶面,在80 min、BiOCl投加量为0.4 g/L条件下,BiOCl对PNP的去除率高达99.7%。动力学研究表明,该降解过程符合一级动力学方程,动力学常数为0.043 min-1。自由基捕获实验证实,该降解过程中主要的自由基为?O2-和?OH。此外,还分析了BiOCl降解PNP的机理。研究结果为光催化法治理废水提供了有价值的信息和参考。 相似文献
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Dongxiang Zhang Hang Xu Min Xue Wenguo Xu V. Tarasov 《Frontiers of Chemical Engineering in China》2008,2(3):319-324
Ultra-fine zinc oxalate powders were prepared through a precipitation stripping method with bis(2-ethylhexyl) phosphate (HDEHP)
diluted by tetrachloride carbon as the extractant, and oxalic acid ethanol aqueous solution as the re-extractant and precipitator.
Zinc oxide powders were obtained by decomposing zinc oxalate powders at 450uC. The prepared zinc oxide powders were characterized
by transmission electron microscope (TEM), Scanning electron microscope (SEM), Thermogravimetric analysis (TG), X-ray diffraction
(XRD) and Fourier transmission infrared (FT-IR) spectrum. The photocatalytic performance of methylene blue by zinc oxide was
studied based on the Langmuir model and Photo-Layer model. The results show that some zinc oxide powders were micro-multipore
materials with hexagonal crystal. The particle size was around 32 nm. The photocatalytic process was the control step in the
chemical reaction. The photo catalytic process followed pseudo-first order kinetics and •OH concentration inside the photo-layer
in different reaction condition were calculated according to the Photo-Layer model.
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Translated from Transactions of Beijing Institute of Technology, 2007, 27(7): 641–645 [译自: 北京理工大学学报] 相似文献