CeO_(2)/MMT纳米复合材料的制备及其可见光催化氧化性能研究  

Preparation and Photocatalytic Oxidation Performance of CeO_(2)/MMT Nanocomposites

作　　者：李友凤 易睿 方程 商涛 肖菡曦 LI Youfeng;YI Rui;FANG Cheng;SHANG Tao;XIAO Hanxi(School of Chemistry and Chemical Engineering,Zunyi Normal College,Zunyi 563000,China)

机构地区：[1]遵义师范学院化学化工学院,贵州遵义563000

出　　处：《水处理技术》2024年第9期80-84,97,共6页Technology of Water Treatment

基　　金：国家自然科学基金项目(52166008);遵义师院服务地方产业革项目(尊师CXY2021[01]);贵州省教改基金项目(2020179)。

摘　　要：采用沉淀法和水热法合成CeO_(2)/MMT纳米复合材料,利用XRD、SEM、BET和UV-Vis DRS等方法对材料的结构、形貌、织构特性和光吸收性能进行分析。在长弧氙灯照射下,模拟太阳可见光降解四环素,研究降解液pH、CeO_(2)与MMT的质量比、催化剂用量及抗生素初始浓度等参数对CeO_(2)/MMT光催化的降解性能的影响。结果发现,CeO_(2)/MMT光催化氧化性能较CeO_(2)的要好,且催化氧化反应宜在酸性溶液中进行,当CeO_(2)与MMT的质量比为2时,取得良好的催化降解效果;随着催化剂用量的增大,催化降解率增大,最佳催化剂用量宜为2.5 g/L;四环素初始质量浓度在0.02 g/L以下,降解效果较好;在最佳工艺条件下,CeO_(2)/MMT对四环素的降解率达95%左右。自由基捕获实验发现,CeO_(2)/MMT可见光催化氧化降解过程中•O_(2)^(-)和h^(+)两个活性基团起主要作用,其催化性能稳定,重复使用效果较好。The CeO_(2)/MMT nanocomposites were synthesized by precipitation method and hydrothermal method.The structure,morphology,texture characteristics,and light absorption performance of CeO_(2)/MMT nanocomposites were characterized using XRD,SEM,BET,and UV-Vis DRS methods.The photocatalytic degradation antibiotics performance of CeO_(2)/MMT nanocomposites was studied under the irradiation of a long arc xenon lamp.The effects of degradation solution pH value,mass ratio of CeO_(2)to MMT,catalyst dosage,and initial concentration of antibiotics on the photocatalytic degradation performance of CeO_(2)/MMT were studied.The results showed that the catalytic oxidation reaction of CeO_(2)/MMT nanocomposites should be carried out in an acidic solution.When the mass ratio R of CeO_(2)to MMT was 2,a better catalytic degradation effect could be achieved.With the increase of catalyst dosage,the catalytic degradation rate increases,and the optimal catalyst dosage should be 2.5 g/L.The initial concentration of tetracycline was below 0.02 g/L,and it displayed well degradation effect.Under the optimal process conditions,the degradation rate of low-concentration tetracycline by CeO_(2)/MMT reaches about 95%.The•O_(2)^(-)and h^(+)active groups played a major role in the visible light catalytic oxidation degradation process of CeO_(2)/MMT by the free radical capture experiment.

关 键 词：CeO_(2)/MMT 复合材料 可见光 催化氧化 四环素 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]