银掺杂TiO_(2)的制备及光催化氧化NO_(x)的应用

Preparation of silver doped titanium dioxide and its applicationsin photocatalytic oxidation of nitrogen oxides

为了拓宽TiO_(2)的光响应范围并将其应用于控制环境中NO_(x)的污染,采用一步水热法制备银掺杂的二氧化钛(TiO_(2))光催化剂。通过X射线衍射仪(XRD)、透射电子扫描显微镜(TEM)以及紫外可见分光光度计(UV-Vis)等对制备的样品进行表征分析。结果表明:所制备的银掺杂二氧化钛光催化剂由锐钛矿相组成,其粒径随银摩尔分数的增加而减小,而水热温度的升高会促进晶粒长大,吸收光谱发生红移。0.5%Ag-TiO_(2)在模拟太阳光下表现出优异的光催化氧化能力,对氮氧化物(NO_(x))的脱除率达到82.43%。这可以归因于光催化剂高的可见光吸收能力和窄带隙,有利于电子的传输并促进NO_(x)氧化为HNO_(3)。

In order to enlarge the light response range of TiO_(2) and apply it to the control of NO_(x) pollution in the environment,a one-step hydrothermal method was used to prepare silver-doped titanium dioxide(TiO_(2))photocatalyst.The synthesized samples were analyzed by X-ray diffractometer(XRD),transmission electron scanning microscope(TEM)and ultraviolet-visible spectrometer(UV-Vis).The results indicated that the synthesized silver-doped TiO_(2) photocatalystwas composed of anatase phasesand its particle size reduced with the increasing of Ag doping amount.Increase of hydrothermal temperature induced crystal grown up.The photocatalytic system with 0.5%Ag-TiO_(2) exhibited the best oxidationandadsorptiontonitrogen oxides(NO_(x))under simulated solar irradiation,with 82.43%removal efficiency.This could be attributed to the high visible-light absorption ability and the narrow bandgap of the photocatalysts,which will improve thetransport of electronsand facilitate the oxidation of NO_(x) to HNO_(3).