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1、Cu2O论文：Cu_2O-氧化物复合光催化薄膜的制备及光催化性能研究【中文摘要】本文采用电化学沉积法和化学法在导电玻璃(ITO)和普通玻璃基底上制备Cu2O-氧化物复合光催化薄膜,在可见光照射下,对活性艳红染料废水、敌百虫等目标降解物进行光催化降解反应的研究。分别采用X射线衍射(XRD),扫描电子显微镜(SEM),拉曼散射对不同方法、不同工艺条件下制备的复合薄膜的相结构,表面形貌和拉曼散射特性进行了分析与测试。系统研究了各工艺参数对其结构和性能的影响。研究结果如下：采用电化学法,以ITO导电玻璃、铂薄片为工作电极,以硫酸铜和乳酸体系沉积Cu2O薄膜,以硝酸锌和硝酸钾体系沉积ZnO薄膜,确定所制
2、备的薄膜是纯Cu2O晶体和纯ZnO晶体,成功合成了Cu2O-ZnO薄膜。通过SEM图片观察,所制Cu2O晶型为粒径均一的立方体结构,ZnO为扁六方柱晶体。电解液pH、沉积电流等对薄膜表面形态都有一定的影响；利用化学法,制备出ZnO-Cu2O复合光催化薄膜,同时制备了Fe2O3-Cu2O、SnO2-Cu2O、SiO2-Cu2O复合光催化薄膜,确定所制备的薄膜是纯ZnO晶体,属于六角铅锌矿结构；通过SEM测定可知,400体系下制备ZnO薄膜结晶性很好,分布均匀,颗粒比表面积大,所得的ZnO-Cu2O复合薄膜平整且界面清晰。随着退火温度提高,ZnO晶粒增大；分别采用电化学法和化学法制备复合光催化薄膜
3、对难降解物活性艳红溶液进行光催化研究,结果表明,电化学法制备的薄膜中Cu2O-ZnO复合薄膜光催化效果最优,相同时间内,10ml浓度为25mg/l的活性艳红降解率达到99.7%；化学法制备的薄膜中ZnO-Cu2O复合膜的光催化效果最优,相同光照时间内,10ml浓度为25mg/l的活性艳红降解率达100%；考察单因素实验得知,最终得出制备Cu2O-ZnO复合薄膜的优化工艺条件为：电解液浓度0.4M,pH为7.88,水浴温度为60,沉积电流为0.025A,沉积时间为30min；制备ZnO-Cu2O的优化工艺：醋酸锌与无水乙醇的摩尔比为1：85,乳酸6ml,热处理温度400,薄膜为5层；通过利用不同
4、方法制备的和同种方法不同条件制备的Cu2O-ZnO、ZnO-Cu2O复合光催化薄膜,对敌百虫进行光催化降解,复合薄膜的降解效果优于单纯薄膜。初始浓度为60mg/l,光照10h,各薄膜光催化对敌百虫COD的去除率分别达到：电化学法制备Cu2O-ZnO 91.2%、ZnO-Cu2O 85.4%、Cu2O 51.1%；化学法制备ZnO-Cu2O88.7%、ZnO 53.6%。说明Cu2O-ZnO复合光催化薄膜降解敌百虫取得较好的效果。Cu2O-ZnO复合光催化薄膜对敌百虫的降解符合一级动力学规律。【英文摘要】In this shudy, Cu2O-Oxide composite photocatal
5、yst thin films were prepared by electrochemical deposition and Chemical method, then some typical wastewater and Organophosphate trichlorfon as the study object was leading research direction.X-ray diffraction(XRD), scanning electron microscopy(SEM),Raman scattering were used to analysis and testing
6、 the phase structure of composite films and the morphology of the surface which were prepar in different ways under different conditions.Systematically studied various process parameters on the structure and properties.The results sa follows:A conventional two-electrode cell was used with an ITO sub
7、strate and a platinum as the working electrode, thin films of Cu2O were electrodeposited in copper sulfate and lactic acid, thin films of ZnO were electrodeposited in zinc nitrate and potassium nitrate, The morphological structure of the photocatalyst particles was characterized by XRD,SEM and so on
8、. The result showed that the product was indeed Cu2O and ZnO which were preparated by electrochemical deposition, the morphology of Cu2O and ZnO particles were uniform cubic structure and hexagonal crystals respectively,successful synthesis of Cu2O-ZnO thin films at the same time. The pH value of el
9、ectrolyte, current of electrochemical deposition and so on have influence on the Surface morphology of the films.Preparation of the ZnO-Cu2O composite films by Sol-gel method, use slide as the carrier, preparation of Fe2O3-Cu2O, SnO2-Cu2O, SiO2-Cu2O composite thin film catalyst, the result showed th
10、at the product was indeed ZnO which were preparated by Sol-gel, and the morphology of ZnO particles was uniform structure of hexagonal zinc, Measured by SEM shows that ZnO thin films prepared at 400system have good crystallinity, distribution uniform, large specific surface area of particles,and the
11、re are flat and clear interface of Composite films. As the annealing temperature increases, ZnO grain size also increases.Use electrochemical and chemical method respectively to preparation of composite photocatalytic films,then research the photocatalytic of degradation refractory materials for act
12、ivity of dye solution. The results show that, preparation Cu20-Zn0 composite film by electrochemical have the best effect in photocatalytic, in the same time,10ml volume concentration of 25mg/1 of the activity red for the degradation rate is 99.7%.However ZnO-Cu2O composite film which was prepared b
13、y chemical method have the best effect of photochemical catalysis, in the same time,10ml volume concentration of 25mg/l of the activity red for the for the degradation rate is 99.7%. The single factor experiments showed that,the concentration was the most important factor on the photocatalytic activ
14、ity,followed by the pH and the temperature.The optimum conditions of the Cu2O-ZnO thin film were:the concentration of electrolyte was 0.4M,pH was 7.88, temperature was 60, deposition current was 0.025A, deposition time was 30min. The single factor experiments showed that,the layers is the most impor
15、tant factor on the photocatalytic activity,followed by the lactic acid and the temperature.The optimum conditions of the ZnO- CU2O thin film were:zinc acetate:ethanol=1:85, lactic acid 6ml, five layers and calcination temperature was 400.The Cu2O-ZnO and ZnO- Cu2O which were preparated by different
16、methods and the different preparation conditions of the different method were used to decompose the trichlorfon. The degradation result of the compound membrane is superior to the simple membrane. The initial density is 60mg/l, illumination 10h, Removal rate to metrifonate COD respectively reach:electroplating Cu2O-ZnO was 91.2%, electroplating ZnO-Cu2O was 85.4%, Sol-gel ZnO-Cu2O was 88.7%, Sol-gel ZnO was 53.6%, electroplating Cu2O was 51.1%, This shows that Cu2O- ZnO compo
