Cr3+离子掺杂对负载TiO2薄膜光催化活性的影响

以钛酸丁酯和CrCl3·6H2O为原料,采用溶胶-凝胶法在钛片、玻璃、釉面瓷砖、陶瓷、不锈钢和铝片六种载体上制备了Cr3 掺杂TiO2薄膜。讨论了不同Cr3 掺杂浓度下,不同载体表面上制备的TiO2薄膜对甲基橙脱色率的影响。试验结果表明:Cr3 对TiO2薄膜的掺杂效果与载体的类型密切相关,并且不同载体其Cr3 掺杂的最佳浓度也不同。Cr3 掺杂后,TiO2薄膜光催化活性提高最大的是釉面瓷砖,其次是玻璃、钛片、铝片、陶瓷,最差的是负载不锈钢。     

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。     

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。     

负载型TiO2薄膜光催化剂降解亚甲基蓝

采用溶胶-凝胶法制备了玻璃负载的TiO2薄膜光催化剂,研究了该催化剂对亚甲基蓝溶液的光催化降解,考察了反应时间、水样的初始浓度、溶液的pH等对光催化降解效果的影响。     

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。     

La掺杂TiO2/有机改性膨润土对TNT弹药废水的光催化降解性能研究

利用超声强化溶胶-凝胶法制备了La掺杂TiO2/有机改性膨润土复合光催化材料并进行了结构表征;以弹药废水中主要污染物质TNT作为目标物,考察了影响光催化降解性能的因素.结果表明：有机改性后复合材料的吸附性能和光催化性能均有所增加,对TNT的60min的吸附去除率和光催化降解率分别达到9.68％和94.53％;影响TNT光催化降解率的因素有光照时间、催化剂用量、TNT初始浓度、溶液pH值和光照强度.     

负载型纳米TiO2光催化剂的制备及其降解水中微量间二甲苯的研究

采用浸涂-烧结法制备的纳米TiO2光催化剂负载量约为6mg／g载体，催化剂经5次重复使用其催化效果稳定，表明催化剂表面TiO2粉体负载牢固；以高压汞灯为光源，对水中微量间二甲苯的负载型纳米TiO2光催化氧化过程的研究表明：初始浓度在6．68～17．36mg／L的范围内，间二甲苯的光催化反应遵循表现一级反应动力学规律，反应的表现速率常数随溶液初始浓度的增大而减小，半衰期则随初始浓度的增大而增加。     

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。     

TiO2光催化降解阳离子艳红反应动力学研究

本文以沉淀法制备的TiO2为催化剂,紫外杀菌灯为光源,对阳离子艳红染料的光催化降解进行动力学研究.实验结果表明TiO2光催化降解低浓度阳离子艳红的反应为一级反应,反应动力学行为符合Langmuir-Himshelwood方程,其反应速率常数为1.87 mg/L·min.     

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。     

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.     

H2O2／Fe2＋氧化偶合混凝法处理干膜废水的研究

本文研究了H     

Gasification of Inferior Coal with High Ash Content under CO2 and O2/H2O Atmospheres

The gasification reaction of Nantong inferior coal was investigated in a laboratory fixed-bed reactor under CO₂ and O₂/H₂O atmospheres. The effects of the bed temperature and inlet-gas concentration on the yields of CO, H₂, and CH₄ were studied. The effects of coal ash and particle size on the fixed-carbon conversion were also investigated, and kinetic analysis was conducted with a homogeneous model. The product-gas-heating value and fixed-carbon conversion increased when the temperature was increased from 950 °C to 1100 °C under CO₂ atmosphere. When the inlet-CO₂ concentration was increased from 50 to 100 vol.%, the low heating value of the product gas and carbon conversion ratio slightly increased. During the gasification of inferior coal under the O₂/H₂O atmosphere, the CO concentration increased rapidly with increasing temperature. The H₂ and CH₄ concentrations increased initially and then decreased. The maximum gas heating value of 7934 kJ/m³ was obtained under the O₂ concentration of 70 vol.% at a bed temperature of 1050 °C. The cold-gas efficiency increased with increasing temperature and became 40.6% and 86.4% at 1100 °C under the CO₂ and O₂/H₂O atmospheres, respectively. The gasification reaction of the Nantong inferior coal strongly depended on the content of inherent inorganic matter. The gasification rates for both the CO₂ and O₂/H₂O atmospheres were independent of the particle size. The activation energy for the CO₂ and O₂/H₂O gasification reactions were 137 and 81 kJ/mol, respectively. The gasification reactions of the Nantong coal, which was performed under two different atmospheres, were compared and the reaction activity of the gasification reaction under CO₂ atmosphere was found to be much lower than that under the O₂/H₂O atmosphere.     

改性纤维素对电镀废水中Cu2＋，Zn2＋，Ni2＋的捕集

制备并研究了改性纤维素对Cu2 、Zn2 、Ni2 3种重金属离子的捕集效果.研究了反应时间、药剂用量、pH值、反应温度对其效果的影响.结果表明,在pH值为中性或碱性,反应温度为25℃时,改性纤维素对重金属离子具有较好的捕集效果.今后可进一步根据物质结构与性能的关系对天然高分子进行改性,并加强应用的研究.     

重铬酸钾褪色法和硫酸铬显色法直接测定COD_Cr

建立了重铬酸钾褪色法和硫酸铬显色法直接比色测定CODcr的方法,重铬酸钾褪色法测定范围10-700mg／L,检出限7.0mg／L,三次平行测定CODcr值为417mg／L样品,标准差为2.6mg／L,回收率为96.6％;硫酸铬显色法的测定范围30-1200mg／L,检出限为23.0mg／L,三次平行测定CODcr值为987mg／L,标准差为22.3mg／L,回收率为96.3％,两种方法都优于HJ／T399-2007推荐的方法。