矿物负载纳米TiO2光催化复合材料的研究进展

综述了国内外有关矿物负载纳米TiO2光催化复合材料的研究和应用现状,重点介绍了矿物载体以及负载方法的研究进展,评述了各载体及负载方法的特点,并展望了负载型TiO2光催化剂的研究发展方向.     

纳米矿物材料负载TiO_2在污水处理中的研究进展

非金属矿物以其特殊的纳米孔道结构和形态成为纳米TiO2的理想光催化载体,本文系统论述了非金属纳米矿物／纳米TiO2复合光催化剂在污水处理中的研究和应用,重点介绍了非金属纳米矿物载体及其种类、负载工艺和负载趋势的研究现状,并对负载型光催化剂存在的问题进行了简述。     

以玻璃珠为载体的负载型二氧化钛的制备及光催化活性研究

在溶胶-凝胶法制备。TiO2胶体溶液的基础上,用玻璃珠作载体制备了负载型TiO2光催化剂,利用SEM对玻璃珠载体和玻璃珠负载TiO2膜的粒径进行了表征分析;同时对玻璃珠负载TiO2的光催化活性进行了研究。     

负载型TiO2光催化剂研究进展

纳米TiO2 光催化剂的负载化是实现其产业化的关键之一。本文对二氧化钛的光催化机理、负载所用的载体、负载方法等方面作了综合评述 ,分析了载体的分类、特点及其对TiO2 的影响 ,以及负载方法的特点和典型工艺路线 ,并提出了今后的研究方向。     

矿物负载纳米TiO2制备技术的进展

目前制备纳米TiO2粉体的方法很多,本文在总结归纳了典型的制备方法的基础上,分析研究了非金属矿物的特性和环境效应。在比较分析的基础上,提出了采用微波法制备负载型非金属矿物纳米TiO2复合材料的方法。     

负载型TiO2光催化剂的研究进展

TiO2光催化技术是一种节能、高效的绿色环保新技术。TiO2光催化剂在废水处理、空气净化和材料自洁等领域具有诱人的应用前景。将其负载于一定的载体上,并设计出高效的光反应器是其实用化的关键之一。本文综合评述了负载型TiO2光催化剂发展状况,着重介绍了负载型TiO2光催化剂载体类型与作用、固定化方法以及负载对光催化活性的影响,指出目前研究中存在的问题,并展望未来的研究方向。     

多孔矿物负载纳米TiO2光催化材料的研究进展

纳米半导体光催化技术几乎可以矿化所有有机污染物,被认为是一种最为环保的环境污染物深度处理技术.多孔矿物负载纳米TiO2光催化材料是高效、易回收、易于推广的纳米材料复合体系光催化剂,是目前光催化材料领域的研究热点.介绍了多孔矿物负载纳米TiO2光催化材料的制备及应用的研究现状,主要包括多孔矿物/纳米TiO2复合体系、金属...     

TiO_2光催化剂的负载技术

从负载TiO2光催化剂的载体、制备方法以及催化剂的负载机理等三个方面综述了近几年来TiO2光催化剂的负载技术。     

多孔矿物负载纳米TiO_2光催化降解高浓度有机废水的研究进展

详细介绍了纳米TiO2的紫外光与可见光光催化机理,综述了三维孔结构矿物负载纳米光催化材料、二维层状孔结构矿物负载纳米光催化材料、一维管状孔结构矿物负载纳米光催化材料的国内外研究进展,展望了纳米TiO2光催化技术降解高浓度有机废水的应用前景。     

多孔矿物负载纳米TiO2光催化材料的研究进展

纳米半导体光催化技术几乎可以矿化所有有机污染物,被认为是一种最为环保的环境污染物深度处理技术。多孔矿物负载纳米TiO2光催化材料是高效、易回收、易于推广的纳米材料复合体系光催化荆,是目前光催化材料领域的研究热点。介绍了多孔矿物负栽纳米TiO2光催化材料的制备及应用的研究现状,主要包括多孔矿物／纳米TiO2复合体系、金属离子／多孔矿物／纳米TiO2复合体系、金属氧化物／多孔矿物／纳米TiO2复合体系,并对其应用前景进行了展望。     

Photocatalytic decolorization of rhodamine B by immobilized TiO2/UV in a fluidized-bed reactor

The photocatalytic oxidation of Rhodamine B (RhB) was studied by using a newly developed immobilized photocatalyst (TiO₂ immobilized by support consisting of a perlite and silicone sealant) and a fluidized-bed reactor. Three 8W germicidal lamps were used as the light source and the reactor volume was 2.8l. When this photocatalyst was employed in a batch process, a total decolorization of the RhB in reaction times lower than 60 min was observed. The optimum dosage of photocatalyst was 33.8 g/l. The initial RhB decolorization rate of the immobilized TiO₂ was higher than that of the suspended TiO₂ and this did not agree with pseudo first-order kinetics because of the adsorption onto the surface of the immobilized TiO₂. This result indicated that the adsorption capacity of the immobilized photocatalyst is very important in photocatalysis.     

路面材料负载纳米二氧化钛光催化降解氮氧化物

随着汽车工业的发展,汽车尾气排放的氮氧化物对环境造成了巨大污染。以路面材料为载体,研究了负载型纳米二氧化钛对氮氧化物的降解作用。研究表明：水泥混凝土负载的光催化剂具有优越的光催化功能,而沥青混合料的较差。从载体对气体的吸附能力、吸光性和透光性等方面进一步研究了这两类载体的差异,提出了负载型纳米二氧化钛光催化降解氮氧化物的机理模型。     

非金属矿物负载纳米二氧化钛研究进展

二氧化钛在解决环境污染问题方面有着广阔的应用前景。将二氧化钛负载固定于非金属矿物载体之上,能够更好地提高二氧化钛的催化和应用性能。简单介绍了二氧化钛的催化机理,综述了非金属矿物材料负载二氧化钛的研究进展,并就未来的发展趋势进行了展望。     

Controllable fabrication of cadmium phthalocyanine nanostructures immobilized on electrospun polyacrylonitrile nanofibers with high photocatalytic properties under visible light

A novel photocatalyst of nanostructured cadmium phthalocyanine (CdPc) immobilized on the surface of polyacrylonitrile (PAN) nanofibers had been successfully fabricated by a simple combination of electrospinning technique and the solvent-thermal process. FE-SEM micrographs indicated that the nanostructured CdPc uniformly immobilized on the surface of PAN nanofibers without agglomeration. And the obtained CdPc/PAN composite nanofibers exhibited high visible light photocatalytic activity for the degradation of rhodamine B. Moreover, this photocatalyst could be easily separated for reuse due to the one-dimensional nanostructural property of the CdPc/PAN composite nanofibers.     

Photocatalytic degradation of gaseous trichloroethene using immobilized ZnO/SnO2 coupled oxide in a flow‐through photocatalytic reactor

The photocatalytic degradation of gaseous trichloroethene (TCE) was investigated on immobilized ZnO/SnO₂ coupled oxide in a flow‐through photocatalytic reactor. It was found that gaseous photocatalysis is an efficient method for volatile organic compounds' abatement and air purification. Degradation of ～100% was found for TCE at the concentrations examined, up to 400 ppmv, in a flow‐through dry synthetic gas stream. In our tested conditions, the flow rate had little influence on the photocatalytic degradation efficiencies of TCE, while the relative humidity had a significant influence on the photocatalytic degradation of TCE. The photocatalytic degradation efficiencies of TCE increased slowly below 20% relative humidity and then decreased as the relative humidity increased further. The deactivation of used immobilized photocatalyst was not observed within the 200 h testing period in the present experiment, although the surface of the photocatalyst changed greatly during the use of the photocatalyst. Copyright © 2004 Society of Chemical Industry     

固定化光催化技术及其适用水处理反应器研究进展

光催化技术因其具有较高的催化活性和低廉的价格已经在水处理中被广泛采用,但是粉末催化剂的明显缺点制约了其工业化应用,因此固定化光催化技术应运而生。通过收集国内外资料,对于光催化固定技术应用的两个关键因素——固定方法和适用的反应器的发展进行了介绍。当固定的同时催化剂活性不会大幅下降,且采用适合于该种载体的反应器,固定化光催化技术在水处理领域有着广阔的应用前景。     

光催化还原法制备载Ag光催化剂

采用光催化还原法在大颗粒负载型TiO2表面上制备了负载型Ag/TiO2光催化剂。以对甲基橙溶液的降解活性为研究对象，考察了光催化剂制备过程中AgNO3溶液浓度，还原反应气氛，还原反应时间，反应液pH值，EDTA的加入等反应条件的影响。研究了光催化还原法制备载Ag催化剂的可行性，得出光催化还原法的优化制备条件。     

Dip to Drink: Solar Photocatalytic Reduction of Cr(VI) Using Fibrous Red Phosphorus Immobilized Quartz Sand as “Dip-Catalyst”

Cr(VI) is a highly toxic inorganic water pollutant and shows adverse effects on human health. Photocatalytic treatment is a green and efficient method to reduce the toxic Cr(VI) to non-toxic Cr(III). In general, photocatalysts are used in slurry form, which turns the post purification such as separation and re-use of the catalyst tedious. To overcome this limitation, in this article we describe the immobilization of visible light/sunlight active photocatalyst i.e. fibrous red phosphorus (FRP) on quartz sand (QS). FRP is a crystalline allotrope of red phosphorus with interesting structural features and optimum bandgap i.e.?~?1.9 eV with sunlight/visible light activity. FRP immobilized QS was used as a photocatalyst for the reduction of Cr(VI) at different initial concentrations of Cr(VI) and with different loads of photocatalyst. High rate of Cr(VI) photoreduction was observed with 100 mg of FRP immobilized QS with a rate constant of 0.052 min^?1. Immobilized photocatalyst was loaded in a tea bag and used as a “dip-photocatalyst” for the reduction of Cr(VI). In this process 80% of Cr(VI) reduction occurred in 60 min with a rate constant of 0.034 min^?1. After the photocatalytic process, dip catalyst was dried under ambient conditions and re-used for the 2nd and 3rd cycles. Such immobilization of catalyst and using it in a tea bag as a dip catalyst facilitates the hassle free separation, re-use of the photocatalyst and eliminates the necessity of post purification processes and makes the photocatalytic environmental remediation processes more cost effective.