光助类Fenton法降解水中土霉素的研究

Photocatalytic degradation of oxytetracycline in aqueous solutions using Fenton-like system

四环素类抗生素在废水中很难降解处理,由此造成的环境污染已引起广泛关注。本论文选取常见的抗生素土霉素作为研究对象,采用廉价易得的普通铁粉作为催化剂,研究光照、溶液的pH值、土霉素初始浓度、铁粉的投加量、H_2O_2投加量等因素对土霉素的去除效果的影响,发现在紫外光照、铁粉投加量为2.0g·L^(-1)、pH值为6.0、H_2O_2投加量为20mg·L^(-1)的催化条件下,质量浓度为50mg·L^(-1)的土霉素溶液5h内基本完全降解,去除率高达98%。该研究结果表明,紫外光对铁粉的催化降解有协同作用,光催化去除过程符合一级反应动力学模型。紫外光条件下铁粉对水溶液中的土霉素有很好的去除效果。

Tetracycline antibiotics in wastewater are difficult to dispose. The serious tetracycline pollution in the environment has attracted wide attention. In this paper, the removal of the common antibiotic oxytetracycline （OTC） using readily available inexpensive iron powder as a catalyst was investigated. It was found that degradation of OTC was strongly dependent on the light, the pH value of solution, the initial concentration of oxytetracycline, the dosage of iron powder and the dosage of H202. Under UV radiation, pH 6.0, after 5h of reaction, the removal ef- ficiency can reach 98% when the quality of iron powder is 1.0g＂ L-1, H202 is 20mg＂ L-l and the initial concentration of OTC is 50mg＂ L-j. The UV light has a synergistic effect on the catalytic degradation of iron powder in this sys- tem.The kinetics study revealed the photodegradation rate followed first-order kinetics. All these resuhs revealed that iron powder can be applied in the reduction of potential contaminants such as tetracyclines.