摘要
盐酸四环素(TC)作为一种广谱抗生素,广泛应用于临床医学、畜牧业和水产养殖业,致使大量TC废水排放到水生环境中,并通过食物链危害人类健康。光催化作为一种先进的氧化技术,在处理难降解废水方面具有显著优势。本工作在水热法制备Bi2WO6的基础上,以共沉淀法掺杂适量的CeO_(2)合成复合催化剂CeO_(2)/Bi_(2)WO_(6),并对其晶体结构、形貌特征和光吸收性能等进行表征。结果表明,CeO_(2)/Bi_(2)WO_(6)摩尔比、催化剂投加量、TC初始浓度和溶液初始pH值对可见光催化降解TC有显著的影响,其中,CeO_(2)/Bi_(2)WO_(6)异质结的形成能够有效提高光生电子空穴的分离效率,进而增强光催化效率。当CeO_(2)/Bi_(2)WO_(6)的摩尔比为1:3、溶液初始pH为5、TC浓度为8 mg/L、CeO_(2)/Bi_(2)WO_(6)投加量为0.4 g/L时,TC和溶液总有机碳(TOC)的去除率可分别达90.7%和64.3%。根据自由基捕获实验和催化剂的价带、导带位置,提出CeO_(2)/Bi_(2)WO_(6)异质结光催化降解TC的机理。经过6次循环实验,CeO_(2)/Bi_(2)WO_(6)催化剂对TC去除率仍为86.4%。
Tetracycline hydrochloride(TC),as a broad-spectrum antibiotic,is widely used in clinical medicine,animal husbandry,and aquaculture.It makes a large amount of TC wastewater discharged into the aquatic environment and ultimately endangers human health through the food chain.As an advanced oxidation technology,photocatalysis has significant advantages in refractory wastewater treatment.In this study,CeO_(2)/Bi_(2)WO_(6)was prepared by the hydrothermal method,and the composite CeO_(2)/Bi_(2)WO_(6)was synthesized by doping appropriate CeO_(2)in Bi,WO_(6).The crystal structure,morphological characteristics,and light absorption performance were characterized.The results showed that the CeO_(2)/Bi_(2)WO_(6)ratio,catalyst dosage,initial concentration of TC,and initial pH value of the solution had a significant impact on the catalytic degradation of TC by photocatalysis under visible light.The formation of CeO_(2)/Bi_(2)WO_(6) heterojunction could effectively improve the separation efficiency of photogenerated electron-hole pairs,thereby greatly enhancing photoactivity.When the molar ratio of CeO_(2)/Bi_(2)WO_(6) was 1:3,the initial pH value was 5,the initial concentration of TC was 8 mg/L,and the dosage of CeO_(2)/Bi_(2)WO_(6)was 0.4 g/L,the removal rate of TC and TOC of the solution could reach up 90.7% and 64.3%,respectively.The possible photocatalytic degradation mechanism of TC over CeO_(2)/Bi_(2)WO_(6)was proposed according to the results of the free radical captured experiment and the potential value of the conduction band and valence band of the catalyst.After six cycle experiments,the removal rate of TC by CeO_(2)/Bi_(2)WO_(6).catalyst could still reach 86.4%.
作者
吴平平
孟冠华
杜宇
刘宝河
施绪
周瑞
江用彬
章慧娟
Pingping WU;Guanhua MENG;Yu DU;Baohe LIU;Xu SHI;Rui ZHOU;Yongbin JIANG;Huijuan ZHANG(College of Energy and Environment,Anhui University of Technology,Ma'anshan,Anhui 243002,China;Engineering Research Center of Biofilm Water Purification and Utilization Technology,Ministry of Education,Ma'anshan,Anhui 243002,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2024年第1期117-126,共10页
The Chinese Journal of Process Engineering
基金
安徽省高校自然科学研究项目(编号:KJ2021A0383)
生物膜法水质净化及利用技术教育部工程研究中心开放基金资助项目(编号:BWPU2021ZY02)
安徽工业大学国家级大学生创新创业教育训练计划项目(编号:202110360135)。
