B/Fe2O3共掺杂纳米TiO2可见光下催化性能研究

采用溶胶-凝胶法制备了B／Fe2O3共掺杂TiO2复合光催化材料，并用XRD、荧光光谱（FS）和紫外可见漫反射光谱（DRS）对粉体进行了表征。XRD显示催化剂以锐钛矿存在的纳米颗粒，硒显示了颗粒的光谱特征，DRS显示掺杂B能极大提高催化剂可见光响应。以2，4-二氯苯酚（DCP）为降解物质，在紫外和可见光下分别研究了复合催化剂的光催化活性。结果表明，掺杂B能使吸收光谱红移至可见光区，而进一步掺杂Fe203大大提高了催化剂的活性。     

新型可见光响应光催化剂的研究进展

研究开发高活性的可见光响应催化剂对于解决环境污染和能源短缺问题具有重要意义。在阐述反应机理的基础上,介绍了改性Ti O2、多元金属复合氧化物、卤氧化物、铋系化合物等新型可见光响应光催化剂的研究现状,并对未来可见光响应催化剂的机理探讨、催化活性提高、制备新技术等方面的研究进行了展望。     

稀土掺杂纳米TiO2光催化的研究进展

综述了近年来稀土掺杂纳米TiO2的研究进展，对其掺杂机理以及掺杂对TiO2晶型、晶粒、光谱响应范围、光催化活性等方面的影响进行了论述，并对今后的研究方向作了展望。     

TiO2光催化法处理难降解废水的研究进展

以TiO2为催化剂,催化氧化法处理污水是近年来兴起的一种现代水处理技术,本文介绍了提高TiO2光催化剂催化效率,及对催化剂进行改性的方法,主要的手段主要有以下几个方面：减小催化剂尺寸、沉积贵金属、掺杂金属离子、光催化剂负载化、半导体复合等。介绍了国内外近年来有关多相光催化反应中光催化反应器设计与研究的进展情况。     

纳米复合催化剂光催化活性研究进展

综述了国内外关于TiO_2、g-C_3N_4、CdS光催化剂掺杂的研究现状,介绍了这3种光催化剂的制备方法、结构特征以及在水处理领域中的应用等。阐明了掺杂催化剂在催化性能方面与单一催化剂相比有明显提高,并进一步提出光催化剂掺杂是今后的研究方向。     

TiO2光催化氧化的研究进展

概述了TiO2光催化氧化降解水中污染物的原理及TiO2光催化剂的制备，提出了增强其活性的途径。TiO2光催化氧化可应用于印染、农药、造纸等工业废水及饮用水处理中，研制高效的负栽型纳米TiO2光催化剂、解决太阳能利用问题、开发多功能光催化反应器是今后TiO2光催化氧化的发展趋势。     

光催化还原法处理含cr（Ⅵ）废水的研究

采用自制TiO2作为光催化剂,利用光催化-混凝联合处理含Cr（Ⅵ）废水,研究了废水的pH值、催化剂用量、反应时间、有机物和混凝剂种类对含Cr（Ⅵ）废水中Cr（Ⅵ）去除率的影响。结果表明,在添加EDTA,pH值为1,紫外灯120min左右,二氧化钛加入量为0．4g,采用FeCl3和PAM作为混凝剂时,Cr（Ⅵ）的去除效率最好。     

γ-Fe_2O_3/SiO_2/GR/TiO_2复合光催化剂的制备及可见光光催化性能研究

采用溶胶-凝胶法制备了γ-Fe_2O_3/SiO_2/GR/TiO_2复合光催化剂。通过XRD、SEM、DRS、VSM对样品的结构、形貌、吸收光谱、磁性进行表征,并通过在可见光下对亚甲基蓝的降解评价复合光催化剂的光催化性能和稳定性。结果表明,该复合光催化剂在可见光下具有较好的光催化性能。石墨烯可以抑制电子-空穴对的复合,增强TiO_2在可见光区的吸收,提高了TiO_2的光催化性能。复合光催化剂经多次重复利用后仍能保持较高的光催化活性。     

纳米级二氧化钛光催化氧化技术的研究

本文阐述了TiO2光催化剂的光催化机理及其在有机废水处理等方面的研究进展。并提出了TiO2光催化氧化同时脱硫脱氮的研究设想。     

可见光下掺铁二氧化钛薄膜降解室内苯的研究

采用溶胶-凝胶法,以玻璃为载体,以钛酸丁酯为前驱体制备掺铁TiO2薄膜以降解室内空气中的苯。结果表明,TiO2薄膜中掺杂适量的过渡金属离子Fe3+可显著提高其可见光光催化活性,提升苯的降解效果;反应体系中水蒸气的含量会影响苯的光催化降解效果。动力学研究结果表明,苯的光催化降解反应可用Langmuir-Hinshelwood(L-H)准一级动力学方程来描述。     

Photocatalytic activity of tungsten-doped TiO2 with hydrothermal treatment under blue light irradiation

Tungsten doping and hydrothermal treatment were found to significantly improve the visible-light photoactivity of TiO(2) synthesized by the sol-gel method. It was observed that TiO(2) doped with a 0.5% W:Ti mole ratio and treated with 4 h of hydrothermal curing showed photoactivity under blue light irradiation equal to 74% of the commercial Degussa P-25 under UV irradiation, i.e., 0.01 mM 2-chlorophenol was completely removed in 120 and 90 min, respectively. Light absorptivity and photocatalytic activity under blue light irradiation were not dependent on the crystallite structure of the TiO(2). The oxidation kinetics under blue light irradiation can be effectively explained by the Langmuir-Hinshelwood model with an apparent reaction rate constant and a Langmuir constant of 3.60 × 10(-4) mM min(-1) and 206.53 mM(-1), respectively.     

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: a short review

In recent years, the application of heterogeneous photocatalytic water purification processes has gained wide attention due to its effectiveness in degrading and mineralizing the recalcitrant organic compounds as well as the possibility of utilizing the solar UV and visible-light spectrum. This paper aims to review and summarize the recent works on the titanium dioxide (TiO(2)) photocatalytic oxidation of pesticides and phenolic compounds, predominant in storm and wastewater effluents. The effects of various operating parameters on the photocatalytic degradation of pesticides and phenols are discussed. Results reported here suggest that the photocatalytic degradation of organic compounds depends on the type and composition of the photocatalyst and, light intensity, initial substrate concentration, amount of catalyst, pH of the reaction medium, ionic components in water, solvent types, oxidizing agents/electron acceptors, catalyst application mode, and calcination temperature in the water environment. A substantial amount of research has focused on the enhancement of TiO(2) photocatalysis by modification with metal, non-metal and ion doping. Recent developments in TiO(2) photocatalysis for the degradation of various pesticides and phenols are also highlighted in this review. It is evident from the literature survey that photocatalysis has good potential to remove a variety of organic pollutants. However, there is still a need to determine the practical utility of this technique on a commercial scale.     

Photocatalytic degradation of disperse blue 1 using UV/TiO2/H2O2 process

The photocatalytic degradation of a dye derivative, C.I. disperse blue 1 (1), has been investigated under UV light irradiation in the presence of TiO2 and H2O2 under a variety of conditions. The degradation was studied by monitoring the change in substrate concentration employing UV spectroscopic technique as a function of irradiation time. The degradation was studied under different conditions such as different types of TiO2, reaction pH, catalyst and substrate concentration containing hydrogen peroxide (H2O2), besides molecular oxygen in the presence of TiO2. The degradation of dye was also investigated under sunlight and the efficiency of degradation was compared with that of the artificial light source. The degradation rates were found to be strongly influenced by all the above parameters. The photocatalyst Degussa P25 was found to be more efficient for the degradation of the dye.     

阳离子艳红染料的光催化降解

本文研究了以沉淀法制备的TiO2为催化剂，紫外杀菌灯为光源，对阳离子艳红染料进行光催化降解的可行性，结果表明，在实验条件下，本系统对阳离子艳红染料有明显的降解效果，浓度为10mg/L的阳离子艳红染料经过30min的处理，其降解率＞88％，此外，还探讨了溶液初始pH值，催化剂的投加量，光照距离和液层高度等因素对光降解反应的影响。     

用二氧化钛光催化氧化法降低丙烯腈污水中的化学需氧量

在开放的光催化反应器中,以紫外(UV)光为光源,以二氧化钛为催化剂,研究了不同水质条件下对模拟丙烯腈(AN)污水中化学需氧量(COD)的控制效果及主要影响因素。结果表明,UV光-TiO2催化体系对AN污水中COD具有良好的去除效果。当在浓度为300mg/L模拟AN污水中投加浓度为20mg/L的二氧化钛及紫外光照射180min时,污水体系中的COD残存率为7.9%。同时,反应过程中不会对环境产生二次污染。     

Removal of the hazardous dye rhodamine B through photocatalytic and adsorption treatments

This paper reports on photocatalytic and adsorptive treatment of a hazardous xanthene dye, Rohdamine B, in wastewater. The photocatalytic degradation was carried out in the presence of the catalyst TiO(2) and the effects of pH, concentration of the dye, amount of TiO(2), temperature and electron acceptor H(2)O(2) on the degradation process were observed. It was found that photocatalytic degradation by TiO(2) is an effective, economical and faster mode of removing Rohdamine B from aqueous solutions. Attempts were also made to utilize activated carbon and rice husk as potential adsorbents to remove Rhodamine B from wastewater. The adsorption studies were carried out at 40, 50 and 60 degrees C, and the effects of pH, temperature, amount of adsorbents, concentration of adsorbate, etc., on the adsorption were measured. On the basis of adsorption data the Langmuir and Freundlich adsorption isotherm models were also confirmed. The adsorption isotherm constants thus obtained were employed to calculate thermodynamic parameters like Gibb's free energy, change in enthalpy and entropy. In order to observe the quality of wastewater COD measurements were also carried out before and after the treatments. A significant decrease in the COD values was observed, which clearly indicates that both photocatalytic and adsorption methods offer good potential to remove Rhodamine B from industrial effluents.     

Advanced oxidation treatment of pulp mill effluent for TOC and toxicity removals

Pulp mill effluent was treated by different advanced oxidation processes (AOPs) consisting of UV, UV/H2O2, TiO2-assisted photo-catalysis (UV/TiO2) and UV/H2O2/TiO2 in lab-scale reactors for total organic carbon (TOC) and toxicity removals. Effects of some operating parameters such as the initial pH, oxidant and catalyst concentrations on TOC and toxicity removals were investigated. Almost every method resulted in some degree of TOC and toxicity removal from the pulp mill effluent. However, the TiO2-assisted photo-catalysis (UV/TiO2) resulted in the highest TOC and toxicity removals under alkaline conditions when compared with the other AOPs tested. Approximately, 79.6% TOC and 94% toxicity removals were obtained by the TiO2-assisted photo-catalysis (UV/TiO2) with a titanium dioxide concentration of 0.75gl(-1) at pH 11 within 60min.