摘要
采用水热法将TiO_(2)纳米片修饰在中空管状g-C_(3)N_(4)上制备了TiO_(2)/g-C_(3)N_(4)(T-CN)复合催化剂。利用扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(UV-Vis DRS)和光电流响应等对其形貌、结构和光物理性能进行了表征。结果表明,TiO_(2)纳米片均匀地分散在中空管状g-C_(3)N_(4)表面,两者紧密结合形成异质结。TiO_(2)与g-C_(3)N_(4)的质量比为20%时制得的T-CN-20复合催化剂在60 min内对U的去除率为85.64%,是纯相g-C_(3)N_(4)的6.7倍。在10倍高浓度阳离子共存条件下的去除率仍大于69.8%,且具有优良的结构稳定性。对光催化产物分析可知,T-CN将U还原为难溶的U(63.68%)以去除铀,可有效解决含铀核废水中的U污染问题。根据能带理论分析,提出了复合催化剂异质结的Ⅱ型光催化机理。
TiO_(2)/g‑C_(3)N_(4)(T‑CN)composite catalyst was successfully prepared by hydrothermal reaction of hollow tubular g‑C_(3)N_(4) and TiO_(2) nanosheets.Its morphology,structure,and photophysical properties were characterized by scanning electron microscopy(SEM),X‑ray photoelectron spectroscopy(XPS),UV‑visible diffuse reflectance spectrum(UV‑Vis DRS),and photocurrent response.The effect of different amounts of TiO_(2) on the photoreduction and fixation of Uby T‑CN was studied.The results showed that when the mass ratio of TiO_(2) to g‑C_(3)N_(4) was 20%,the removal rate of Uby T‑CN‑20 was 85.64%in 60 min,which was 4.0 times of that of pure phase g‑C_(3)N_(4).The removal rate of Uwas still more than 69.8%under the coexistence of 10 times of high concentration cations,and had excellent structural stability.According to the analysis of photocatalytic products,T‑CN‑20 reduced Uto insoluble U(63.68%)for removal,which can effectively solve the problem of Upollution in uranium‑containing nuclear waste water.Based on the analysis of energy band theory,the type‑Ⅱphotocatalysis mechanism of composite catalyst heterojunction was proposed.
作者
粟阳藩
吴林珍
李依林
李蕊
何攀
张玲
张友魁
雷洁红
段涛
SU Yang‑Fan#;WU Lin‑Zhen;LI Yi‑Lin;LI Rui;HE Pan;ZHANG Ling;ZHANG You‑Kui;LEI Jie‑Hong;DUAN Tao(School of Physics and Astronomy,China West Normal University,Nanchong,Sichuan 637009,China;National Co‑innovation Center for Nuclear Waste Disposal and Environmental Safety,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Sichuan Tianfu New Area Innovation Institute,Southwest University of Science and Technology,Chengdu 610299,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2023年第4期689-698,共10页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21976148,21906133,11905177,21902129)
四川省杰出青年科技人才项目(No.2021JDJQ0016)
西南科技大学大学生创新基金(No.CX22-032)资助。
