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以硫酸钛为原料,在210 ℃低温下,水热制备TiO2纳米带.通过沉淀法用CdS修饰TiO2纳米带表面,制得TiO2@CdS复合光催化剂,采用XRD、TEM和反射紫外对其结构及光化学特性进行初步表征.以可见光(λ≥450 nm)光催化降解罗丹明B(Rhodamine B,RhB)、水杨酸(Salicylic Acid,SA)及2,4-二氯苯酚(2,4-Dichlorophenol,2,4-DCP)为探针反应,研究反应温度、介质和负载CdS对TiO2@CdS结构性能的影响.结果表明,所制备的TiO2纳米带分散性好.复合粉末由锐钛矿相TiO2和立方相CdS组成.常温25 ℃中性介质中用CdS修饰的TiO2的活性,在可见光照射下,为单纯TiO2纳米带的29倍.同时,TiO2也促进了CdS可见光光催化活性的提高.通过跟踪降解体系紫外-可见光谱(UV-vis)、红外光谱(FTIR)和总有机碳(TOC)测定,结果发现TiO2@CdS/vis体系在pH 7.0时,对SA的降解率较TiO2纳米带有显著地提高,反应15 h和21 h后,RhB和2,4-DCP的矿化率分别可达到47.8%和30.8%.

参考文献

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