g-C_(3)N_(5)/β-Bi_(2)O_(3)复合材料催化降解盐酸四环素的性能  

Photocatalytic performance of g-C_(3)N_(5)/β-Bi_(2)O_(3)composites on tetracycline hydrochloride degradation

作　　者：漆于辉 王涛 马雪娥 常玥[1,2,3] 查飞[1] QI Yuhui;WANG Tao;MA Xue'e;CHANG Yue;ZHA Fei(College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou 730070,Gansu,China;Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education,Lanzhou 730070,Gansu,China;Key Laboratory of Polymer Materials of Gansu Province,Lanzhou 730070,Gansu,China)

机构地区：[1]西北师范大学化学化工学院,甘肃兰州730070 [2]生态功能高分子材料教育部重点实验室,甘肃兰州730070 [3]甘肃省高分子材料重点实验室,甘肃兰州730070

出　　处：《精细化工》2025年第1期166-175,共10页Fine Chemicals

基　　金：国家自然科学基金项目(21865031)。

摘　　要：以g-C_(3)N_(5)、Bi(NO_(3))_(3)•5H_(2)O和草酸钠(Na_(2)C_(2)O_(4))为原料,通过水热和煅烧方法制备了g-C_(3)N_(5)/β-Bi_(2)O_(3)(CN/BO)复合材料,利用XRD、SEM、TEM、UV-Vis DRS、PL和EIS对CN/BO进行了表征。在模拟自然光条件下,测试了CN/BO对水中盐酸四环素(TC)的光催化降解性能,考察了影响TC降解率的因素及CN/BO的底物普适性和循环使用性能,并对CN/BO光催化降解TC的机理进行了推测。结果表明,CN/BO光催化活性优于单一材料。50CN/BO(即g-C_(3)N_(5)质量为复合材料质量的50%)具有最佳光催化活性,在30 mL TC初始质量浓度为20 mg/L、50CN/BO加入量为20 mg、模拟光光照时间90 min时,TC降解率为94.1%,总有机碳(TOC)去除率为72.5%;光照60 min,其对罗丹明B、孔雀石绿等6种常见水污染物的降解率在81.0%~99.8%之间;溶液中CO_(3)^(2−)可降低TC的降解率,而S_(2)O_(8)^(2−)则可提高TC的降解率;pH=6~12时,50CN/BO光催化性能基本不变;50CN/BO重复使用5次仍保持较高的催化活性;超氧自由基和空穴是CN/BO光催化降解TC反应的主要活性物种。β-Bi_(2)O_(3)与g-C_(3)N_(5)之间形成的S型异质结提高了电荷分离和转移能力,增加了CN/BO参与光降解反应的活性基团数目。g-C_(3)N_(5)/β-Bi_(2)O_(3)(CN/BO)composites were prepared by hydrothermal and calcination method using g-C_(3)N_(5),Bi(NO_(3))_(3)•5H_(2)O and sodium oxalate(Na_(2)C_(2)O_(4))as raw materials,and characterized by XRD,SEM,TEM,UV-Vis DRS,PL and EIS.The photocatalytic performance of CN/BO on tetracycline hydrochloride(TC)degradation in water under simulated natural light was evaluated.The influencing factors on the degradation rate of TC,the substrate universality and recycling performance of CN/BO were further analyzed,and the mechanism of CN/BO photocatalytic degradation on TC was speculated.The results indicated that CN/BO composites showed better photocatalytic activity than single material,with the 50CN/BO(That is,g-C_(3)N_(5)mass fraction is 50%)displayed the best photocatalytic activity.Under the conditions of TC(30 mL)initial mass concentration 20 mg/L,50CN/BO 20 mg and the illumination time 90 min,the degradation rate of TC was 94.1%and the total organic carbon(TOC)removal rate was 72.5%,while under illumination time 60 min,the degradation rate of six common water pollutants,such as Rhodamine B and malachite green,reached 81.0%~99.8%.CO_(3)^(2−)could reduce the degradation rate of TC,while S_(2)O_(8)^(2−)showed the opposite trend.50CN/BO exhibited basically no photocatalytic performance change at pH=6~12,and still maintained high catalytic activity after repeated use for 5 times.Superoxide radicals and holes were the main active species in CN/BO photocatalytic TC degradation.S-type heterojunction formed betweenβ-Bi_(2)O_(3)and g-C_(3)N_(5)improved charge separation and transfer ability,and increased the number of active groups of CN/BO participated in the photodegradation reaction.

关 键 词：g-C_(3)N_(5)/β-Bi_(2)O_(3) 复合材料 光催化降解 盐酸四环素 水处理技术 

分 类 号：X703[环境科学与工程—环境工程] TB333[一般工业技术—材料科学与工程] O643.36[理学—物理化学]