ZnO/SnO2复合材料的制备及光催化降解印染废水研究  

Preparation of Zn O/SnO2 composites and photocatalytic degradation of printing and dyeing wastewater

作　　者：杜娜[1] DU Na(Shijiazhuang University of Applied Technology, Shijiazhuang 050081, China)

机构地区：[1]石家庄职业技术学院

出　　处：《印染助剂》2019年第7期31-34,共4页Textile Auxiliaries

摘　　要：采用共沉淀法合成了ZnO/SnO2(ZS)纳米复合材料,在氮气气氛下,在管式炉中分别于700、800、900、1 000℃退火1h。利用XRD、SEM、UV-Vis、PL等手段对退火后的样品进行表征,以确定样品的晶相、晶粒尺寸、形貌和载流子寿命等特性。对甲基橙模拟印染废水进行降解,研究其光催化活性。结果表明,在800℃下退火的样品表现出最佳的光催化活性,因为异质结的形成促进了电子-空穴对的分离;进一步升高退火温度,光催化活性下降,在1 000℃下退火的样品几乎没有光催化活性,因为高温退火过程中生成了Zn2SnO4中间相,降低了光催化活性。ZnO/SnO2(ZS) nanocomposites were synthesized by coprecipitation method. The nanocomposites were calcined in a tubular furnace in nitrogen atmosphere for 1 h at 700, 800, 900 and 1 000 ℃, respectively. The calcined samples were characterized by different techniques such as XRD, SEM, UV-Vis and PL to determine the crystal phase, crystal size, morphology and carrier life time analysis. The photocatalytic activity of methyl orange in simulated printing and dyeing wastewater was studied. The results showed that the samples calcined at 800 ℃ exhibited the best photocatalytic activity, because the formation of heterojunctions promoted the separation of electrons and holes. The photocatalytic activity decreased with the increase of calcined temperature, and the samples calcined at 1 000 ℃ had almost no photocatalytic activity, because the intermediate phase of Zn2SnO4 was formed during high temperature annealing, which reduced the photocatalytic activity.

关 键 词：纳米复合材料 煅烧 甲基橙 光催化活性 晶粒尺寸 

分 类 号：X791[环境科学与工程—环境工程]