真空吸附水解制备活性炭负载TiO2及其光催化降解间二氯苯

采用直接真空吸附钛酸四丁酯后水解法制备了以活性炭为载体的负载型TiO2光催化剂，以间二氯苯为探针分子研究了催化剂光催化降解反应性能。实验结果表明：随着热处理温度的不同，催化剂的光催化活性有很大的变化，对催化剂多次反复使用，其活性基本不变。     

纳米TiO2／ACF净化材料的制备及影响因素研究

以活性炭纤维（ACF）为载体,纳米TiO2为催化剂,用浸渍法制备了TiO2／ACF净化材料。以甲苯为模拟污染物,研究浸渍时间和负载量对其光催化活性的影响。结果发现：浸渍时间和负载量对TiO2／ACF净化材料的光催化性能有一定的影响,1h为最佳浸渍时间,1．0mg／mL为浸渍液中TiO2的最佳浓度。     

Zn-TiO2／AC复合催化剂的制备及其光催化活性

以硝酸锌、钛酸四丁酯和活性炭为原料，采用真空吸附法制备了不同组成的Zn-TiO2／AC．通过X射线衍射(XRD)和透射电镜(TEM)对催化剂进行了表征．选择较难降解的C13CCOOH作为探针分子考察了其光催化活性．结果表明，掺锌能提高TiO2／AC的催化活性，当Zn的摩尔分数为0．5％(相对TiO2)、处理温度为400℃，溶液的pH值为6时，Zn-TiO2／AC催化剂具有很好的光催化活性．     

以ACF为模板制备掺氮TiO2及其光催化脱氨氮研究

本文采用溶胶-凝胶法制备了以活性炭纤维（ACF）为模板的掺氮TiO2光催化剂，利用XRD、XPS、TEM、SEM和UV-Vis等方法对催化剂进行了表征，测定了催化剂在紫外、日光照射下光催化脱氨氮的活性．ACF作模板掺氮TiO2催化剂具有介孔结构，平均粒径约为10nm，比表面积为64．43m^2/g．紫外、可见光光催化2h氨氮（85mg／L）废水的氨氮去除率分别为68％和47％．结果表明，催化剂中氮的含量是影响催化剂光催化活性的重要因素。     

活性炭纤维负载二氧化钛复合催化剂降解甲基橙性能研究

制备了活性炭纤维负载二氧化钛复合催化剂ACF/TiO2,并在紫外光下降解甲基橙以考察其催化活性。并在同等条件下,对未负载二氧化钛的活性炭纤维空白样品进行了对比实验;同时还考察了ACF/TiO2的循环使用寿命。结果表明,ACF/TiO2降解能力大于未负载的活性炭纤维,其降解能力是吸附性能和光催化性能的协同作用,并拥有较长的循环使用寿命。     

活性炭纤维负载二氧化钛光催化再生处理VOCs中试实验

现在空气质量状况越来越受到人们的重视,尤其是挥发性有机物对的污染很严重。本实验以具有很强吸附能力的活性炭纤维(ACF)为载体,采用浸渍法将TiO2负载于ACF制成TiO2/ACF复合材料,对模拟环己烷废气的吸附及光催化降解效果进行了研究。实验考察了TiO2浓度、煅烧温度及紫外光照时间等因素对环己烷去除率的影响。结果表明,在实验范围内,当TiO2浓度为0.01mol/L,煅烧温度为100℃,紫外光照时间为1.5h,制得的TiO2/ACF的光催化活性最高。     

活性炭纤维负载二氧化钛去除挥发性有机物研究

以活性炭纤维为载体，以TiO2粉末为原料，采用浸渍涂膜法制备TiO2膜。利用TiO2膜作为光催化剂，采用功率15W，波长253．7nm的紫外荧光灯作为光源，在圆筒型光催化反应器中，对模拟甲苯废气的去除效果进行了实验研究。实验考察了甲苯浓度、酯醇比以及光强等因素对甲苯去除率的影响。结果表明，在光照的条件下，TiO2活性炭纤维膜对初始浓度为2920mg／m3甲苯的去除率可达到42％。随着甲苯初始浓度的增大和反应时间的逐渐增加，TiO2活性炭纤维膜对甲苯的光催化降解效果降低，催化剂失活。     

纳米SiO2／TiO2光催化降解空气中甲醛的研究

采用共沉淀方法制备了Si共掺杂的SiO2／TiO2光催化复合粉末,将其负载于活性炭（ACF）上。在流动化床中,考察了煅烧温度、煅烧时间、Si掺杂量、负载次数、光照条件以及甲醛初始浓度对该复合剂光催化降解甲醛效率的影响。结果发现当Si：Ti：1：4、SiO2／TiO2复合催化剂煅烧时间4h、煅烧温度400℃,ACF上负载1次,18w紫外光照射时,甲醛的降解效果最佳,对初始浓度小于0．4mg／L的甲醛气体,降解率可达90％左右。     

吸附-光催化氧化净化甲醛废气的试验研究

以活性炭纤维为吸附剂,将过渡金属离子掺杂修饰技术制备了高活性TiO2光催化剂,在紫外光照射下对低浓度的甲醛进行吸附——光催化氧化试验研究,分析了催化剂的用量、光照时间、浓度等因素对光催化效果的影响和ACF(活性炭纤维)重复使用的情况。     

活性炭纤维负载纳米TiO2在光反应器中降解空气中微量甲醛的研究

以活性炭纤维为载体,用浸涂法制备了TiO2/ACF(活性炭纤维)光催化剂,设计了栅式光反应器用于空气中微量甲醛的净化,研究了ACF/TiO2的组成和光反应器构造对甲醛净化量的影响。结果表明,TiO2/ACF对空气中微量甲醛有较高的光催化降解活性,催化剂m(TiO2)/m(ACF)=0.082 1,光反应器催化层厚度为2 mm,各催化层间隔为20 mm时,甲醛净化量较大。TiO2/ACF催化剂稳定性好,累计运行45 h,甲醛的净化速率仍保持在0.150μg/(g.m in)左右。     

不同有机化合物在TiO2负载活性炭纤维上的

以环氧树脂为炭质前驱体将TiO₂粉体粘附于ACF表面，然后在N2气氛460 ℃焙烧，树脂热解、逸失使剩余残炭成为二者之间的连接体，获得TiO₂/ACF复合产品。ACF负载TiO₂后，其比表面积降低，但仍很好地维持了ACF的孔隙结构。由SEM可知，纳米级单体TiO₂颗粒以微小团簇结构分布于ACF表面。以对氨基苯酚、亚甲基兰和β-环状糊精三种不同分子尺寸的有机化合物为探针，通过TiO₂/ACF对它们的光催化降解研究发现，化合物自身分子尺寸对其降解程度有重要影响。具有适宜分子尺寸亚甲基兰的去除程度最高，TiO₂/ACF的降解速率高于悬浮态P25，在重复利用过程中未见降低。通过对比三种有机分子在有、无紫外光照下的去除程度，可确认有机分子是被降解而非吸附于TiO₂/ACF上。     

低含量Ni掺杂TiO2光催化剂及其在水溶液体系中的重复使用性能

利用溶胶-凝胶法制备了低含量Ni掺杂的TiO₂光催化剂粉体,考察了催化剂在甲基橙水溶液中的重复使用性能,并用XRD、XPS和N₂吸附-脱附等手段对催化剂进行了表征分析。结果表明,当掺杂Ni物质的量分数为0.3%和焙烧温度400 ℃时,制备的Ni/TiO₂的光催化降解甲基橙水溶液的活性高于纯TiO₂的光催化降解活性。Ni/TiO₂光催化剂在水溶液体系重复使用过程中,催化活性急剧下降,重复使用性能较差。Ni掺杂使TiO₂上产生具有较低结合能的低价钛离子如Ti^3＋,使表面缺陷（或氧空位）增加。比表面积和氧空位增加可能是Ni掺杂提高TiO₂光催化活性的主要原因。Ni流失可能是Ni/TiO₂在水溶液体系中重复使用性能较差的原因。     

Pr3+:Y2SiO5/ZnO-TiO2/ACF复合材料的制备及其光催化性能

采用溶胶-凝胶法将ZnO掺杂进荧光粉/TiO_2体系,并以活性炭纤维(ACF)为载体,制备了Pr~(3+)∶Y_2SiO_5/ZnO-TiO_2/ACF复合材料。采用XRD、SEM、EDS、FS和UV-vis DRS,对材料的结构及性能进行了表征,并以亚甲基蓝为模拟降解物,考察了ZnO掺杂量对复合材料可见光催化性能的影响。结果表明,当ZnO掺杂质量为TiO_2质量的10%时,制得的复合材料光催化性能最强,在500 mL质量浓度为15 mg/L的亚甲基蓝溶液中反应12 h后亚甲基蓝去除率高达98.0%,反应符合拟一级动力学方程,反应速率常数为0.341 3 h~(-1),是未掺杂ZnO的Pr~(3+)∶Y_2SiO_5/TiO_2/ACF的1.75倍,复合材料重复使用4次后亚甲基蓝去除率仍然保持在85%以上。     

光催化再生粘胶基活性炭纤维研究

采用钛酸四正丁酯为原料 ,用溶胶 -凝胶法在粘胶基活性炭纤维 (ACF)毡表面制备了锐钛矿型的二氧化钛粒子 ,并用XRD ,SEM进行了表征。用聚乙烯醇、柠檬酸等不能加热再生的大分子吸附质考察了负载二氧化钛的ACF毡的光催化降解再生性能 ,并与没有负载二氧化钛的ACF毡的吸附性能作了比较。结果表明 ,负载二氧化钛粘胶基的ACF毡具有高效的光催化再生能力和良好的吸附能力。     

PHOTOCATALYTIC DEGRADATION OF GASEOUS AMMONIA AND TRICHLOROETHYLENE OVER TiO 2 ULTRAFINE POWDERS DEPOSITED ON ACTIVATED CARBON PARTICLES

Two kinds of activated carbon (AC) particles, which possess large adsorption capacity for gaseous ammonia and trichloroethylene (TCE), were selected as the carrier of TiO 2 ultrafine powders. Commercially available TiO 2 sol solutions were used as the source of TiO 2 powders. For the sake of comparison, porous glass (PG) particles and alumina (AL) particles were also selected as the carrier. The photocatalytic activity of TiO 2 /AC, TiO 2 /PG, and TiO 2 /AL was examined using a circulation reaction method. The photocatalytic degradation of gaseous ammonia and TCE was found apparently to obey the first-order reaction with respect to ammonia or TCE. The first-order reaction rate constant over TiO 2 /AC was shown apparently to be higher than those over TiO 2 /PG and TiO 2 /AL. The observed relationship between the apparent first-order rate constant and the TiO 2 catalyst loading could be interpreted satisfactorily in terms of a reaction model based on the premise that the degradation rate constant is proportional to the illumination intensity, whose decay obeys the Lambert-Beer law; this is an extension of the reaction model in a three-phase fluidized-bed reactor under illumination proposed in our preceding paper.     

Photodegradation of Methylene Blue in a Batch Fixed Bed Photoreactor Using Activated Carbon Fibers Supported TiO2 Photocatalyst

A batch fixed bed photoreactor, using felt-form activated carbon fibers (ACF) supported TiO2 photocatalyst (TiO2/ACF), was developed to carry out photocatalytic degradation of methylene blue (MB) solution. The effects of TiO2 particle size, loaded TiO2 amount, initial MB concentration, airflow rate and successive run on the decomposition rate were investigated. The results showed that photodegradation process followed a pseudo-first-order reaction kinetic law. The apparent first-order reaction constant kapp was larger than 0.047 min-1 with half reaction time t1/2 shorter than 15 min, which was comparable to reported data using suspended Degussa P-25 TiO2 particles. The high degradation rate was mainly attributed to adsorption of MB molecules onto the surface of TiO2/ACF. The photocatalytic efficiency still remained nearly 90% after 12 successive runs, showing that successive usage of the designed photoreactor was possible. The synergic enhancement effect in combination of adsorption with ACF and photodegradation with TiO2 was proved by comparing MB removal rates in the successive degradation and adsorption runs, respectively.     

CaSO4/TiO2复合粉体的制备及光催化性能研究

以硫酸氧钛、氧化钙为原料,采用沉淀水解法制备CaSO4/TiO2复合材料,通过探讨不同条件如：煅烧温度、催化剂投加量、光照时间及溶液pH等对光催化降解活性大红的影响。结果表明：复合粉体经500℃煅烧后的光催化效果最佳,当催化剂投加量为2 g/L,溶液pH为6,紫外灯照射180 min,降解率可达到83.85%。     

硅藻土负载纳米TiO2光催化剂处理腈纶废水中COD的研究

以纳米二氧化钛和硅藻土为原材料,采用溶胶-凝胶法制备了硅藻土负载纳米TiO2复合光催化剂处理腈纶废水,考察了催化剂用量、废水初始pH、废水初始浓度等对腈纶废水COD去除率的影响。结果表明,所制备的硅藻土负载纳米TiO2复合光催化剂具有较好的光降解性,在反应时间为6 h,投加量为4 g/L,pH为6,稀释倍数为2倍的条件下,COD去除率达到38.71%。     

Preparation of TiO2 Nanoparticles Coated Cotton Fibers at Low Temperature and Their Photocatalytic Activity

TiO_2 nanoparticles coated cotton fiber composite was successfully prepared by using a sol-gel method at low temperature(about 100℃) using tetrabutyl-titanate [Ti(OBu)_4] as raw material.The preparation of the TiO_2 colloid and the composite were described.The properties of resulting materials were characterized by SEM and XRD,the photocatalytic degradation performance was tested using methylene blue(MB) as the target pollutant in aqueous solution.The results showed that the amorphous TiO_2 nanoparticles were distributed evenly on the outer surfaces of cotton fibers,which shows efficient photocatalytic properties when exposed to UV light,the degradation rate of MB reached 95.35% under the conditions of catalyst dosage 2.5 g/L,MB concentration 50 mg/L,irradiation time 120 min,and pH 10,and the photocatalytic activity of TiO_2/cotton fibers remained above 90% of its activity as-prepared after being used four times,the degradation rate of MB could reach 88.78% when irradiation time was 120 min.The photocatalytic degradation of MB could be properly described by the first-order kinetic law.By comparison of the removal rates of MB with and without UV light,it could be affirmed that the disappearance of MB was due to photodegradation rather than adsorption on cotton fibers.