摘要
为有效缓解我国水资源短缺问题,将水热辅助液相沉积法制备的二氧化钛(H-TiO_(2))与石墨相氮化碳(g-C_(3)N_(4))进行复合,从而有效提高H-TiO_(2)的光催化降解效率。以g-C_(3)N_(4)的添加量为单一变量,采用水热辅助液相沉积法制备H-TiO_(2)/g-C_(3)N_(4)复合光催化剂。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和氮气吸附-脱附仪对样品进行分析,研究g-C_(3)N_(4)的添加量对H-TiO_(2)的物相、微观形貌、比表面积和光催化效率的影响。结果表明,g-C_(3)N_(4)的引入对H-TiO_(2)的微观形貌和光催化降解性能均有显著影响。制备过程中g-C_(3)N_(4)的存在影响H-TiO_(2)的晶体生长,使得H-TiO_(2)颗粒直径增加,表面粗糙度降低。当g-C_(3)N_(4)添加量为300 mg时,复合光催化剂(H-T-CN-300)反应速率最高,其在300 W氙灯照射条件下对罗丹明B(RhB)的降解率速率为H-TiO_(2)降解速率的2.8倍。
Photocatalytic degradation of wastewater can effectively alleviate the shortage of water resources.The photocatalytic degradation efficiency of H-TiO_(2)can be effectively improved by combining with graphite phase carbon nitride(g-C_(3)N_(4)).H-TiO_(2)/g-C_(3)N_(4)composite photocatalyst was prepared by hydrothermal assisted liquid deposition.The samples were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM)and N2 adsorption-desorption.In addition,the effect of the ratio of g-C_(3)N_(4)on H-TiO_(2)composite photocatalysts was also investigated.The results showed that the ratio of g-C_(3)N_(4)could exert strong influence both on the surface morphology and the photocatatlytic performance of the composite materials H-TiO_(2).In the preparation process,the presence of g-C_(3)N_(4)affected the crystal growth of H-TiO_(2),which made the diameter of H-TiO_(2)particles increase and the surface roughness decrease.When the amount of g-C_(3)N_(4)was 300 mg,the as-prepared composite photocatalyst(H-T-CN-300)had the highest reaction rate.And the degradation rate of RhB in the sample of H-T-CN-300 degradation rate was 2.8 times of that of H-TiO_(2)under the illumination by 300 W Xenon lamp.
作者
李超
钟婉菱
刘小明
雷彩霞
LI Chao;ZHONG Wanling;LIU Xiaoming;LEI Caixia(Department of Materials Science and Engineering,School of Resources,Environment and Materials,Guangxi University,Nanning 530004,Guangxi,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2021年第4期194-200,共7页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(51402056)
广西研究生教育创新计划项目(YCSW2019054)。
