基于纳米零价铁的类芬顿体系降解土霉素的研究

Removal of oxytetracycline from aqueous solutions using Fenton-like system with nanoscale zero valent iron

通过FeSO_4与NaBH_4在碱性条件下反应,制备纳米零价铁颗粒。X射线衍射表明产物是α-Fe^0,扫描电子显微镜得到纳米零价铁的粒径大约为20nm,氮吸附比表面积为19.607m^2·g^(-1),等电点为7.2。研究该纳米零价铁对水溶液中的土霉素的去除作用,发现纳米零价铁的投加量、土霉素初始浓度和溶液的pH值均对其去除效果产生影响。在纳米零价铁投加量为1.0g·L^(-1),pH值为6.5的条件下,在4h内将质量浓度为100mg·L^(-1)的土霉素基本完全降解,去除率为98.8%。该研究结果表明,纳米零价铁对水溶液中的土霉素有很好的去除效果。

Zero-valent iron particles （NZVI） were prepared with a method of reduction in liquid phase by the reaction of FeSO4 and NaBH4. X-ray diffraction analysis indicated the α-Fe^0 characteristic of this NZVI. Scanning electron micrographs （SEM） showed that the mean particle size of NZVI was about 20 nm. The results of BET surface area and Zeta-potential analyses indicated that the surface area of NZVI was of 19.607m^2·g^-1, and the isoelectric point was of 7.2. The removal of oxytetraeycline （OTC） using the prepared NZVI at ambient temperature and pressure were investigated. The results indicated that degradation of OTC was strongly dependent on the dosage of NZVI, reactant concentration and pH value. Under pH 6.5, after 4 h of reaction, the removal efficiency can reach 98.8% when the quality of NZVI is 1.0g·L^-1 and the initial concentration of OTC is 100mg·L^-1. All these results revealed that NZVI can be applied in the reduction of potential contaminants such as tetracyclines.