改性凹凸棒黏土的合成及光催化降解盐酸四环素的研究  

On preparing the modified attapulgite clay and the photocatalytic degradation of tetracycline hydrochloride

作　　者：关卫省[1] 杨茜怡[1] 叶林静[1] 

机构地区：[1]长安大学环境科学与工程学院,西安710064

出　　处：《安全与环境学报》2016年第1期197-201,共5页Journal of Safety and Environment

基　　金：高等学校博士学科点专项科研基金项目(20110205110014)

摘　　要：将具有光催化潜力的金属元素Ti、Zn、Ni引入凹凸棒黏土（ATPs）结构中,采用浸渍法制备了一系列不同配比的Ti-ATPs,Zn/Ti-ATPs及Ni/Ti-ATPs光催化材料。采用扫描电子显微镜（SEM）、X射线衍射仪（XRD）、紫外-可见漫反射吸收光谱（UVVis）等方法对改性ATPs的结构、形貌和组成进行了表征。以氙灯（250~800 nm）为光源,用制备的材料作为光催化剂,进行降解盐酸四环素的试验,考察了Ti的单一加入及双金属（Zn/Ti、Ni/Ti）加入对ATPs的光催化改性效果。结果表明,Zn/Ti物质的量比为3∶1、400℃煅烧条件下制备的Zn/Ti-ATPs具有良好的光催化性能,在可见光照射120 min时,20 mg Zn/Ti-ATPs对20 mg/L盐酸四环素的光催化降解率可达94.64%,并且性能稳定。而同样方法制备的Ni/TiATPs没有光催化性能,表明并不是所有具有光催化性能的氧化物都能通过浸渍法对ATPs进行改性。The article is attempting to make the attapulgite clay （ATPs） perform the photocatalytic function, in which it is necessary to mix the photocatalytic potential metal elements Ti, Zn and Ni into the ATPs structure. For this purpose, we have prepared a series of Ti -ATPs, Zn/Ti - ATPs and Ni/Ti - ATPs with the impregnation method. While considering the research needs, we have defined the characteristics of the products concerned by means of electronis scan- ning microscopy （SEM）, the energy disperse spectroscopy （EDS）, the X-ray diffraction （XRD） and the ultraviolet and visible diffusion reflectance spectra （UV - Vis DRS）. Besides, seeing the great re- search demands, we have carefully analyzed the photocatalytic degra- dation activities of the catalysts we have to use. Under the irradiation of a xenon lamp （ λ= 250 - 800 nm）, we have managed to use the modified attapulgite clay for degrading the tetracycline hydrochloride, in addition to the exploration of the effect of modified attapulgite clay on the single metal element Ti loaded and the double metal elements （Zn/Ti, Ni/Ti） loaded. The experimental results we have gained in-dicate that the metal compounds of Zn/Ti - ATPs have a nice photo- catalytic function on the Zn/Ti molar ratio of 3 ： 1 and at the roasting temperature of 400 ~ . In addition, the experiment has helped us to find that the initial concentration of the tetracycline hydrochloride has to be 20 mg/L in the dosage of Zn/Ti - ATPs being 20 mg. What is more, the photocatalytic degrading strength of the tetracycline hy- drochloride can be made as high as up to 94.64% during the 120 min under the irradiation of the xenon lamp light. Thus, in compared with the composite catalyst TiO2/ZnO, Zn/Ti - ATPs enjoys a better pho- tocatalytic function for its broader specific surface. Besides, it also possesses nice stability, while its degradation rate can be made high up to 77.42% even in the third-time repeated test. It is just due to such a nice degrading power that the Zn/Ti

关 键 词：环境工程学 凹凸棒黏土 改性 复合氧化物 光催化 盐酸四环素 

分 类 号：X131.2[环境科学与工程—环境科学] TQ465.4[化学工程—制药化工]