摘要
由于BaTiO_(3)(BTO)面临着太阳能利用率低、光生载流子快速重组和稳定性差的问题,严重限制其在可见光下降解有机污染物。以BaTiO_(3)为基体采用简单的水热法在其周围制备了不同物质的量比的Bi_(2)S_(3)/BTO p-n异质结,以改善BaTiO_(3)的光催化性能。分别采用XRD、SEM、EDS、TEM、XPS、PL、UV-Vis DR、EIS、瞬态光电流响应等表征手段对样品的结构、形貌、表面价态以及光电性能进行分析。以RhB为模拟污染物,测试了复合材料的光催化活性和稳定性。结果表明,与单组分催化剂相比,Bi_(2)S_(3)/BTO复合材料的催化性能得到了显著提升。在可见光下照射150 min后,对RhB的降解率高达98.7%;经5个循环,降解率仍为86%。通过对光催化剂的机理研究表明羟基自由基、超氧自由基、光生空穴均在光催化反应中起作用,并提出了一种可能的p-n异质结光催化机理。
BaTiO_(3)(BTO)faces the problems of low solar energy utilization,rapid recombination of photogenerated carriers and poor stability,which seriously limits the degradation of organic pollutants under visible light.To improve the photocatalysis performance of BaTiO_(3),Bi_(2)S_(3)/BTO p-n heterostructures with different material ratios were prepared around BaTiO_(3) in simple hydrothermal method.XRD,SEM,EDS,TEM,XPS,PL,UV-Vis DR,EIS,transient photocurrent response and other characterization methods were used to analyze the structure,morphology,surface valence,and photoelectric properties of the samples.The photocatalytic activity and stability of the composites were tested with RhB as a simulated pollutant.The results showed that the catalytic performance of Bi_(2)S_(3)/BTO composite had been significantly improved compared with the single component catalyst.After irradiation by visible light for 150 min,the degradation rate of RhB reached 98.7%.After 5 cycles,the degradation rate was still 86%.Through the mechanism study of photocatalyst,it was showed that hydroxyl radical,superoxide radical and photogenerated hole all played a role in the photocatalysis reaction,and a possible photocatalysis mechanism of p-n heterojunction was proposed.
作者
董玮
林莉
李向阳
顾怀章
王雷
梁春华
付定梅
DONG Wei;LIN Li;LI Xiang-yang;GU Huai-zhang;WANG Lei;LIANG Chun-hua;FU Ding-mei(College of Science,Carey College,Carey 556011,China;Key Laboratory of Advanced Functional Materials,Carey College,Carey 556011,China;College of Big Health,Carey College,Carey 556011,China)
出处
《化学试剂》
CAS
北大核心
2023年第1期99-107,共9页
Chemical Reagents
基金
国家自然科学基金项目地区基金项目(21966015)
贵州省教育厅青年人才资助项目(黔教合KY字[2020]185)。
