纳米CeO_2晶体的制备及其光催化性能的研究  

PREPARATION AND PHOTOCATALYTIC PROPERTY OF NANOMETER CeO_2 CRYSTAL

作　　者：李小忠[1] 王连军[1] 赵铭[1] 李健生[1] 孙秀云[1] 

机构地区：[1]南京理工大学化工学院,南京210094

出　　处：《环境化学》2006年第2期149-153,共5页Environmental Chemistry

基　　金：教育部博士点基金(B20020288015)资助项目

摘　　要：用离子交换-真空煅烧法合成了晶格缺陷较多的纳米CeO2晶体．用XRD和氧的程序升温脱附曲线 (O2-TPD)分别对纳米CeO2样品的物相组成、晶体粒径、吸附氧的量及其脱附性能进行分析．结果显示, 高真空煅烧制得的CeO2催化剂晶格缺陷较多,吸附氧的量较多,且吸附氧脱附较容易．在自制的反应器中,用40W的紫外灯作为光源,研究了对苯酚的光催化降解效果．结果表明,0．5g·l-1的催化剂对pH值为7．0和浓度为10mg·1-1的苯酚溶液,1h的光催化降解率达到79．6％．Nanometer CeO2 crystal with more lattice lacunas had been synthesized by ion exchange and followed by vacuum calcination. The phase composition, crystal particle diameter, the performance of oxygen absorption and desorption of the sample were characterized by XRD and O2 - TPD technologies. The resuhs show that CeO2 catalyzer prepared by high vacuum calcinations held more lattice lacunas and more oxygen, which was easily desorbed The photodegradation of phenol had been investigated in the homemade reactor with a UV light of 40W as lamp -house. The CeO2 catalyst prepared by high vacuum calcinations exhibited remarkable reactivity in reaction. Photodegradation rate of phenol （ 10mg·l^-1 ） reaches 79.6%, when pH is 7.0, the dose of the catalyzer is 0. 5g·l^-1 and illumination reach 1h.

关 键 词：二氧化铈 光催化 离子交换 苯酚 

分 类 号：X132[环境科学与工程—环境科学]