Oxide semiconductor tio2 is the common catalyst , but the wide band gap ( 3 . 2ev ) limits its improvement of photocatalytic properties . and other single semiconductor ' s disadvantages also restr ain their applications in the photocatalytic realm 氧化物半导体tio _ 2是使用最多的光催化剂，但由于其较宽的禁带宽度( 3 . 2ev )限制了其光催化效率的提高。
The defects energy levels intensity became smaller , the electrons on the conduction band became more and photocatalysis became better with the heat treatment temperature , the similar conclusion was drawn from experiments 随着热处理温度的升高，试样的缺陷能级密度减小，导带上光生电子的数目相应增大，光催化效率提高，实验中也得出了同样的结论。
Compared with the conventional organic solvents , supercritical carbon dioxide has some advantages including controlling the reaction selectivity and enhancing the reaction rate and efficiency of catalysts 通过与常规有机溶剂中有机反应的对比，著重介绍了超临界二氧化碳作为反庆介质在有机反庆中所显示出的优越性，例如调控反应的选择性，提高反应速度和增加催化剂催化效率等。
In this paper , photocatalytic property and gas - sensitive characterization has been studied , the principle of photocatalysis and preparation has been investigated and the approach of improving the photocatalytic efficiency has been put forward . tio _ 2 films have been prepared by sol - gel method 本文研究了tio _ 2薄膜的光催化性质和气敏特性，研究了光催化反应的原理和制备方法，提出了提高光催化效率的途径。
In the design and fabrication of biosensor , the development of a simple and effective strategy for the construction of sensitive membrane on the electrode is a crucial step . nano - crystalline particles , exhibiting a large surface area with diameter less than 100 nm , high surface - activity , good biocompatibility , strong adsorption and great efficiency of catalysis , might be favorable for constructing biosensor 纳米材料,因其具有大的比表面积、高的表面活性、强吸附力及高催化效率等优异特性,可在增加生物分子(酶、抗原或抗体等)的吸附量和稳定性的同时提高生物分子(酶)的催化活性,使传感器的响应灵敏度得到提高。
A kind of novel composite photocatalysts containing tio2 and tourmaline particles , such as tourmaline / tio2 composite photocatalysts and tourmaline / [ tio2 , sio2 ] composite photocalysts , were fabricated mainly by the sol - gel technique , whose microstructure , photocatalystic activities and spontaneous polarization were investigated by the scanning electron microscope ( sem ) , uv - visible spectro - photometer , etc . the novel porous composite films of tourmaline / tio2 were prepared from alkoxide solutions on the surface of copper by sol - gel method 本工作利用电气石矿物材料的天然电极性、辐射红外线性能和tio _ 2的光催化性能，研制以电气石为载体， tio _ 2薄膜和[ tio _ 2 ， sio _ 2 ]复合薄膜为催化剂的新型复合催化材料。研究材料的制备技术、结构、性能及电气石表面tio _ 2晶体生长机理、电气石增强tio _ 2光催化效率机理。
With the subtrate temperature ' s increasing , the reaction rate increased , the crystal type was transfered from anatase to rutile , the roughness increased , causing the increase in hydropilicity . when substrates " temperature ranged from 450 ~ 550 , the tio2 films were composed with the mixture of rutile and anatase , and the photocatalysed efficiency was the best 随着基板温度的升高，反应速度增加，结晶类型由锐钛矿相逐渐向金红石相转变，粗糙度增大，亲水性逐渐升高，光催化效率在锐钛矿和金红石混合晶型时最佳。
It was still a technical problem on how to add the air to the reactor in so small pressure difference . in addition , the photocatalytic reaction efficiency was very low at the high speed . the reactor will be large , the price will be very high and the electricity will be enormously consumed during the photocatalytic - oxidation of h2s in the methane 主要原因是沼气中不含氧，使用时气体流速大，压差小，而用光催化氧化方法消除h _ 2s需要有相当量的氧参与，在压差很小的情况下，一次空气的加入存在技术困难；在高气体流速条件下，光催化效率低，若用光催化方法消除h _ 2s ，反应设备庞大，耗电量高，价格昂贵，农民难以负担。
The type of photocatalytic reaction was first - degree reaction which was not very typical , and the reaction speed constants could be used to judge the efficiency of photocatalysis . the tio _ ( 2 ) films were prepared on glasses by magnetron sputtering . the influences on the tio _ ( 2 ) films properties of various o _ ( 2 ) partial pressure , various sputtering power , various heat treatment method and n was studied too 加入光催化剂tio _ 2粉末以后，光催化反应速率增幅较大，其过程可以认为是准一级反应，可以用一级反应速率常数来表征光催化效率，降解甲基橙和甲基蓝的反应速率常数分别为0 . 003min ~ ( - 1 )和0 . 35min ~ ( - 1 )左右。
