水热反应温度对ZnIn_(2)S_(4)/Bi_(2)WO_(6)复合催化剂的影响研究

Effect of hydrothermal reaction temperature on ZnIn_(2)S_(4)/Bi_(2)WO_(6) composite catalyst

为解决传统半导体光催化剂可见光响应能力弱、光生电子空穴复合快、能带结构导致载流子氧化还原能力弱等问题,采用水热法制备ZnIn_(2)S_(4)/Bi_(2)WO_(6)(ZlS@BW)复合催化剂并系统研究水热反应温度对其结构性能的影响。当水热温度从80℃升高到160℃,ZlS@BW复合光催化剂结晶度提高,形貌转变为致密核壳结构,比表面积和光电性能先降低再升高,氟伐他汀去除率逐步上升。而当温度升高到200℃时,核壳结构遭到了破坏,比表面积和光电性能变差,氟伐他汀的降解效果降低,光催化性能下降。结果表明,水热温度为160℃时,制备的ZlS@BW复合光催化剂晶型结晶程度较高,且形貌致密,比表面积最大,产生的瞬态光电流最大,阻抗半径最小,具有最优光催化性能。对污染物氟伐他汀降的降解效率最高,可达到75.47%。

The ZnIn_(2)S_(4)/Bi_(2)WO_(6)(ZlS@BW)composite photocatalyst was prepared by hydrothermal method with different temperature to solve the problems of traditional semiconductor photocatalysts,such as weak response to visible light,fast recombination of photogenerated electron-hole and weak redox ability of carrier caused by energy band structure.When the hydrothermal temperature increased from 80℃ to 160℃,the crystallization of ZlS@BW composite photocatalyst increased,the morphology became denser core-shell structure,the specific surface area and photoelectric property first decreased and then increased and the removal rate of fluvastatin gradually increased.When the temperature increased to 200℃,the core-shell structure was destroyed,the specific surface area and photoelectric properties decreased,the degradation of fluvastatin was inhibited.The results showed that the ZlS@BW composite photocatalyst prepared at hydrothermal temperature of 160℃ with high crystallization,compact morphology,maximum specific surface area,maximum transient photocurrent and minimum impedance radius.The excellent photocatalytic performance was also observed and 75.47%of fluvastatin was degraded.