MoO_(3)-Cu_(2)O/CN三相复合光催化剂的制备及其降解四环素性能  

Preparation and tetracycline degradation performance of MoO_(3)-Cu_(2)O/CN ternary photocatalyst

作　　者：崔春丽 郝振华 舒永春 徐继香[3] 王磊[3] CUI Chunli;HAO Zhenhua;SHU Yongchun;XU Jixiang;WANG Lei(School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;Zhongyuan Critical Metals Laboratory,Zhengzhou 450001,China;School of Chemical and Molecular Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]郑州大学材料科学与工程学院,郑州450001 [2]中原关键金属实验室,郑州450001 [3]青岛科技大学化学与分子工程学院,青岛266042

出　　处：《复合材料学报》2025年第3期1361-1374,共14页Acta Materiae Compositae Sinica

基　　金：中原关键实验室项目(GJJSGFYQ202302;GJJSGFZD202303)。

摘　　要：本文通过水热法先在g-C_(3)N_(4)(CN)上原位生长MoO_(3),继而在其表面电沉积Cu_(2)O构建了MoO_(3)-Cu_(2)O/CN三相复合光催化剂。采用XRD、SEM、TEM、XPS和FTIR等手段对催化剂进行表征,证明了复合光催化剂的成功制备。以四环素为目标污染物,探究了所制备光催化剂对四环素的降解效果及光催化剂的作用机制。结果表明,在可见光下,1.5 MoO_(3)-Cu_(2)O-100/CN复合材料对四环素的降解效果最佳,150 min时降解率为97.75%,分别是CN(45.28%)和1.5 MoO_(3)/CN(63.24%)的2.2和1.5倍。采用自由基捕获实验及电子顺磁共振光谱(EPR)对机制进行了探究,证实了羟基自由基(·OH)和超氧自由基(·O_(2)^(-))是光催化过程的主要活性物质。综合各项测试计算CN、MoO_(3)和Cu_(2)O的价带和导带位置,表明三相复合光催化剂形成了双Z型异质结。同时光催化活性的提高主要归因于双Z机制的构建,拓宽了可见光吸收范围,保留了氧化还原能力较高的空穴电子,降低了光生电子与空穴的复合率。稳定性实验结果表明制备的催化剂在经过4次循环后,对四环素的降解率仍达到90%以上,具有优异的稳定性,可循环使用。In this paper,MoO_(3)was in-situ grown on g-C_(3)N_(4)(CN)by hydrothermal method,followed by the electrodeposition of Cu_(2)O to construct a ternary MoO_(3)-Cu_(2)O/CN composite photocatalyst.The catalyst was characterized by XRD,SEM,TEM,XPS and FTIR,which proved the successful preparation of the composite photocatalyst.Taking tetracycline as the target pollutant,the degradation effect of the prepared photocatalyst on tetracycline and the action mechanism of the photocatalyst were investigated.The results showed that 1.5 MoO_(3)-Cu_(2)O-100/CN composite had the best degradation effect of tetracycline at 150 min under visible light,up to 97.75%.They are 2.2 and 1.5 times of CN(45.28%)and 1.5 MoO_(3)/CN(63.24%)respectively.The mechanism was investigated by free radical capture experiment and electron paramagnetic resonance spectroscopy(EPR).It was confirmed that hydroxyl radical(•OH)and superoxide radical(•O_(2)^(−))were the main active substances in the photocatalytic process.The valence band and conduction band positions of CN,MoO_(3),and Cu_(2)O are calculated based on various tests.It is shown that the double Z-type heterojunction is formed by the ternary composite photocatalyst.At the same time,the improvement of photocatalytic activity is mainly due to the construction of double Z mechanism,which widens the visible light absorption range,retains the hole electrons with high REDOX ability,and reduces the recombination rate of photogenerated electrons and holes.The results of stability test show that the catalytic degradation rate of tetracycline is still over 90%after four cycles,which has excellent stability and can be recycled.The results of stability test show that the catalytic degradation rate of tetracycline is still over 90%after four cycles,which has excellent stability and can be recycled.

关 键 词：MoO_(3)-Cu_(2)O/CN 双Z机制 四环素 降解 光催化 

分 类 号：TB331[一般工业技术—材料科学与工程]