摘要
以酵母为生物模板,通过水热-牺牲模板法制备了花簇状g-C_(3)N_(4)/Bi_(2)MoO_(6)微球。利用XRD、SEM、TEM、FTIR、UV-VisDRS、光电流响应以及氮气吸附-脱附等手段对样品的晶体结构、微观形貌、光吸收和比表面积等性能进行了表征,并对样品可见光催化降解亚甲基蓝(MB)模拟染料废水的性能和机理进行了探讨。结果表明,水热-牺牲模板法可实现g-C_(3)N_(4)与Bi_(2)MoO_(6)在生物模板表面的成功复合,样品分散性良好,微球直径约为8μm,表面呈花簇状,比表面积达11.6007 m^(2)/g。可见光下g-C_(3)N_(4)负载量为10%的g-C_(3)N_(4)/Bi_(2)MoO_(6)(以Bi_(2)MoO_(6)的质量计,记为10CN/BM)微球对MB模拟染料废水表现出较高的光催化降解活性,当10CN/BM添加量为1 g/L、可见光照射140min后,初始质量浓度为15mg/L的MB废水的降解率高达96%以上。机理分析证实,微球表面g-C_(3)N_(4)与Bi_(2)MoO_(6)形成的Z型异质结有效降低了电子-空穴对的复合率,显著提升了对模拟染料废水的可见光催化性能。
Flower-like g-g-C_(3)N_(4)/Bi_(2)MoO_(6) microspheres were prepared via hydrothermal-sacrificial template method using yeast as biological template. The crystal structure, microstructure, light absorption and specific surface area of the as-prepared sample were characterized by XRD, SEM, TEM, FTIR, UV-Vis DRS, photocurrent response and nitrogen adsorption-desorption techniques. The photocatalytic degradation performance and mechanism of g-g-C_(3)N_(4)/Bi_(2)MoO_(6) microspheres for methylene blue(MB) simulated dye wastewater under visible-light irradiation were investigated. The results showed that the hydrothermal-sacrificial template method realized the successful recombination of g-g-C_(3)N_(4) and Bi_(2)MoO_(6) on the surface of biological template. The as-obtained microspheres with a diameter of about 8 μm had good dispersity and exhibited flower-like nano-clusters and a specific surface area of 11.6007 m^(2)/g. The g-g-C_(3)N_(4)/Bi_(2)MoO_(6) microspheres with g-g-C_(3)N_(4) loading amount of 10%(based on the mass of Bi_(2)MoO_(6), the same below, denoted as 10 CN/BM) showed high photocatalytic degradation activity for MB simulated dye wastewater under visible light. When the addition amount of 10 CN/BM was 1 g/L and the initial mass concentration of simulated dye wastewater was 15 mg/L, the degradation rate of MB was over 96% under visible light irradiation for 140 min. Mechanism analysis demonstrated that Z-type heterojunction formed between g-g-C_(3)N_(4) and Bi_(2)MoO_(6) on the flower-like surface of bio-templated microspheres effectively reduced the recombination rate of electronic-hole pairs and significantly enhanced the visible-light driven photocatalytic performance for simulated dye wastewater.
作者
杨莉
李润泽
张黎
姜晓雪
王瑞雪
田彬灿
YANG Li;LI Runze;ZHANG Li;JIANG Xiaoxue;WANG Ruixue;TIAN Bincan(Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas of Ministry of Education,School of Water and Environment,Chang'an University,Xi'an 710054,Shaanxi,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第5期1030-1037,共8页
Fine Chemicals
基金
陕西省自然科学基金(2018JM2030)
长安大学国家级大学生创新创业训练项目(S202010710134)。
