太阳能多相光催化法在废水处理中的应用研究评述

概述了光催化反应动力学研究进展和阻碍太阳能多相光催化工业应用的主要问题及其解决途径。现有的规模化应用表明，太阳能多相光催化法比传统方法处理成本低，研制开发高活性光催化剂、优良的载体、高效太阳能反应器是推动其工业化应用的关键。     

A photocatalytic reaction kinetics model based on electrical double layer theory（I）——Surface complexation model at TiO2／water interface

The kinetics of photocatalysis can be usually described by Langmiur-Hinshelwood adsorption expression.The adsorption can be greatly influenced by the surface properties of photocatalyst.Triple layer model(TML) was chosen to describe the surface adsorption of TiO2 based on electrical double layer(EDL theory at the TiO2/water interface.And through the potentiometric titration the parameters of TLM were determined by the extrapolation method and Fiteql3.1 software.The results show that surface complexation dominates the surface charge and the numerical calculation fits the experiment dtat satisfactorily.     

新型Ti／TiO2电极的制备及其光电催化氧化活性

采用电解氧化金属钛网的方法制备新型光电极Ti/TiO2,采用X射线衍射仪,激光拉曼光谱仪与扫描电镜测试电极的表面晶体结构与表面形态,以腐殖酸溶液的总有机炭（TOC）的变化来评价电极的光电催化氧化活性。结果表明,电解电压与电流密度对电极表面的晶体组成,表面 态,孔隙大小与中心电子的结合能影响较大,电极制备的最佳电解电压与电流密度分别为160V,1100A／m^2,光电催化氧化可为给水处理提供一种方便,高效的方法。     

腐殖质/铁氧化物协同促进2,4-D微生物厌氧降解

构建"铁/腐殖质还原菌(Comamonas koreensis,CY01)、腐殖质模式物、铁氧化物、2,4-D"厌氧反应体系,研究2,4-D转化效率与转化途径,探讨2,4-D转化促进机制。结果表明,CY01对2,4-D的直接脱氯效果微弱,蒽醌-2,6-二磺酸钠(AQDS)与针铁矿(α-FeOOH)的加入可有效促进2,4-D厌氧转化,25 d时降解率提高2倍,达33.3%。CY01/AQDS/α-FeOOH/2,4-D体系中,AQDS、Fe(Ⅲ)及2,4-D微生物还原3种过程同时存在,AQDS和Fe(Ⅲ)充当电子穿梭体,加速胞内电子向胞外2,4-D的转移,协同促进2,4-D还原脱氯。本研究可为难降解有机氯农药污染土壤的修复研究提供借鉴。     

表面光催化还原铁对TiO2/SiO2光催化活性的影响

用表面光催化还原铁法对TiO2 /SiO2 复合氧化物进行改性 ,并在改性后用XRD ,TEM进行化学状态、晶体组成与颗粒大小分析。通过对亚甲基蓝的降解揭示表面光还原对催化剂活性的影响。结果表明 :经过表面光催化还原铁法改性的催化剂活性要高于未改性的 ,随着表面还原Fe量的增加 ,催化活性增加。但n(Fe)∶n(Ti) >1.0 %后 ,催化性能急剧下降 ,最佳值为 1.0 %。讨论了Fe杂质对光生载流子分离效率的影响及其影响光催化剂活性的机理。Fe3 + 和Fe2 + 共同存在 ,Fe3 + 是光生电子的捕获阱 ,Fe2 + 是光生空穴的捕获阱 ,在二者的协同作用下 ,载流子得到有效分离 ,催化活性得到提高。     

Photocatalytic degradation of phenol in aqueous solution using TiO_2/Ti thin film photocatalyst

1　INTRODUCTIONHeterogeneousphotocatalysishasbeenwidelyin vestigatedasanalternativemethodfordegradationoforganicpollutantsinrecent 2 0 years .TiO2 isthemostinvestigatedphotocatalystuptodatebecauseitisoftenusedinthetreatmentofpollutantchemicals ,basedonitsremarkableactivity ,chemicalstability ,andalsoonitsnon toxicproperties.Phenolor phenoliccompoundsexistwidelyindailylifeandinindustrialwastewateroriginatingfromcokeovens ,petroleummanufactureorpaintstrippingoperations ,andhavebecomecommonp…     

Adsorption and photocatalytic degradation of phenol over TiO_2/ACF

1　INTRODUCTIONToday ,waterpollutioncausedbyhazardousor ganicchemicalsusedinindustryandagricultureisaveryseriousproblem ,thedeeptreatmentandreuseofwastewaterisveryindispensable[1] .Titaniumdioxideheterogeneousphotocatalysiscandegrademostofor ganicpollutantscompletelyintoCO2 ,H2 Oandinor ganicacid ,andhasshowntremendouspotentialityinthetreatmentofwastewater[2 ] .TiO2 powderhasbeenthemostwidelyusedphotocatalystinthephoto catalyticprocessduetoitsstablechemicalproperties ,easyaccessandcheapc…     

Preparation, Characterization and Photo-Catalytic Behavior of Y_2O_3/TiO_2 Composite Semiconductor Nanopowder

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Effect of surface state properties of modified TiO2 powders on their photo—catalytic activity

With an attempt to investigate the effect of impurity and tungstem oxide on the recombination and separation of electron-hole pairs,and disclose the effect of surface state on the photo-catalytic activity of TiO2,an innovative photo-catalyst 3%WO3/0.5%Au^3 /AiO3 was prepared by means of sol-el method.The photo-oxidation efficiency of photo-catalyst was evaluated by conducting a set of experiments to photo-degraeds methylene blut(MB)in aqueous solution.The surface state properties were examined by means of surface photovoltage spectra(SPS)and electron-field-induced SPS(EFISPS).The experiments demonstrate that the strongest peak is attributed to electron excited from valence band to conduction band and the second strongest peak is attributed to electron excited from valence band to oxygen molecular for all samples,Electron is trapped by O2 absorbed on the surface of TiO2.And the surface state of O2^- forms.For(1%,3%)Au^3 /TiO2 sample,two new peaks that significantly present at 414nm and 400nm respectively should be attributable to gold impurity energy level.And for tungsten oxides doping samples,4 peaks that significantly present in the region of 500-800nm should be attributable to tungstem impurity energy level.The intensity of EFISPS decreases with increasing the content of gold ion or tungsten oxide when its content is no more than their optimal dosage.However,when the content of gold ion or tungsten oxide is more than their optimal dosage,impurity energy level becomes recombination center from separation center and the intensity of all peaks increases for them.     

新型Ti/TiO_2电极的制备及其光电催化氧化活性

采用电解氧化金属钛网的方法制备新型光电极Ti/TiO2 ,采用X射线衍射仪、激光拉曼光谱仪与扫描电镜测试电极的表面晶体结构与表面形态。以腐殖酸溶液的总有机炭 (TOC)的变化来评价电极的光电催化氧化活性。结果表明 ,电解电压与电流密度对电极表面的晶体组成、表面形态、孔隙大小与中心电子的结合能影响较大。电极制备的最佳电解电压与电流密度分别为 16 0V ,110 0A/m2 。光电催化氧化可为给水处理提供一种方便、高效的方法。