LDH/Fe3O4@Cu2O复合材料对盐酸四环素的光催化性能研究

采用液相还原法在制备Cu2O的前驱体中加入LDH/Fe3O4制备出LDH/Fe3O4@Cu2O复合材料，将其对盐酸四环素废水进行光催化降解，研究了催化剂的投加量、光照强度、pH值和共存离子对LDH/Fe3O4@Cu2O复合材料光催化性能的影响，分析了光催化过程中起主要作用的活性基团.结果表明，制备出的LDH/Fe3O4@Cu2O复合材料具有较好的光催化性能，与单纯Cu2O相比，复合材料能够提高光催化降解的速率和效果.光催化降解盐酸四环素的最佳条件：催化剂的投加量为0.1 g·L－1、光照强度为500 W、pH值为10，对50 mg·L－1盐酸四环素的降解效率达到95.2%.溶液中存在阴离子Cl－和HCO时会降低光催化效率，自由基抑制实验证实光催化过程中·O起主要作用.

Research on photocatalytic of tetracycline hydrochloride by LDH/Fe3O4@Cu2O composite material

LDH/Fe3O4@Cu2O composites were prepared by liquid phase reduction in the precursor of preparing Cu2O by adding LDH/Fe3O4， and the photocatalytic degradation of tetracycline hydrochloride wastewater was carried out. The effects of catalyst dosage， light intensity， pH values and coexisting ions on the photocatalytic performance of LDH/Fe3O4@Cu2O composites were investigated. The active groups which played a major role in photocatalysis were analyzed. The results show that the prepared LDH/Fe3O4@Cu2O composites have good photocatalytic properties and the composites can improve the rate and effect of photocatalytic degradation compared with Cu2O alone. The optimum conditions for photocatalytic degradation of tetracycline hydrochloride were as follows the calalyst dosage， the light intensity， pH and the TC degradation efficiency was 0.1 g·L－1,500 W， 10 and 95.2%，respectively. The presence of Cl－ and HCO in the solution reduces the photocatalytic efficiency， and it is confirmed by the free radical inhibition experiment that O plays a major role in the photocatalytic process.