碘氧化铋/铌酸铋复合光催化剂的制备及降解头孢曲松钠性能研究

Study on the preparation of BiOI/BiNbO composite photocatalyst and its photocatalytic degradation of ceftriaxone sodium

采用溶剂热法制备了不同Bi/Nb/I物质的量比的碘氧化铋/铌酸铋(BiOI/BiNbO)光催化剂,探究了其光催化降解头孢曲松钠的性能.同时,利用XRD、SEM、BET及XPS等表征手段对样品的形貌结构和光电化学性能进行了分析,并考察了不同影响因素对可见光降解头孢曲松钠活性的影响.结果表明:BNI-2样品具有降解头孢曲松钠的最高活性,130 min的降解效率达到约83%.4次循环实验证明BNI-2具有较好的稳定性.根据自由基捕获实验和能带结构,发现羟基自由基(·OH)是主要活性物质并提出了光降解可能的机理.本研究为合成铋基复合材料及去除水环境中的有害污染物提供了新的视角和策略.

Bismuth iodide/bismuth niobate(BiOI/BiNbO)photocatalysts with different Bi/Nb/I molar ratios were prepared by solvothermal method to investigate their performance in photocatalytic degradation of ceftriaxone sodium.The morphological structure and photoelectrochemical properties of the samples were analyzed by XRD,SEM,BET and XPS.The effects of different factors on the activity of ceftriaxone sodium degradation under visible light were investigated.The results showed that BNI-2 sample has the highest activity in degrading ceftriaxone sodium,with the degradation efficiency of approximately 83%in 130 min.The four-cycle experiments prove that BNI-2 has good stability.Based on the free radical capture experiment and the energy band structure,hydroxyl radicals(·OH)was found to be the main active substances and a possible photodegradation mechanism was proposed.This work provides a new perspective and strategy for the synthesis of bismuth-based composites for the hazardous pollutant removal in the water environment.