用化学方法制备了负载金的纳米管钛酸(Au/H2Ti2O4(OH)2)光催化剂,并用TEM,XPS,XRD和DRS等技术对催化剂进行了表征. 结果表明,经573 K处理后,纳米管钛酸表面及管内均有零价的金颗粒存在. 与纳米管钛酸(H2Ti2O4(OH)2)相比,Au/H2Ti2O4(OH)2具有明显的CO光催化氧化活性,但在暗态时无活性. 经分析认为,暗态时Au与纳米管相互接触的周界处不活泼,故催化剂无CO催化氧化活性; 紫外光照射下,纳米管激发产生e--h+对,e-从纳米管转移到Au0上, 使纳米管和Au-在接触周界处产生相互作用,形成活性位,导致CO催化氧化反应发生.
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