摘要
为了去除水中难氧化的有害染料中间体H酸,研究以TIO2、ZnO、CdS和Fe2O3为催化剂,采用低压汞灯为光源,对H酸水溶液进行光催化氧化实验.结果表明:TiO2和CdS的催化效果最好.采用TiO2作催化剂,光催化氧化5h后,H酸分解率可达90%,反应速率遵从Langmuir-Hinshelwood方程,K=12.3L/mmol,k=25.2×10-6mol/h.溶液中投加10mg/L的Fe3+或Ag+,可使反应时间缩短2—3h.研究探讨了pH、TiO2投加量和H酸浓度对催化氧化过程的影响.
Photocatalytic oxidation of H-acid in aqueous solution was investigated by irradiating with a 30watts low pressure mercury lamp and using TiO2,ZnO,CdS,Fe2O3 as catalysts.The results indicated that TiO2 and CdS have higher catalytic activity than ZnO and Fe2O3.H-acid in aqueous solution can be degraded more than 90% during a period of 5 hours irradiation when TiO2 is used as catalyst.The rate of photocatalytic oxidation can be expressed by Langmuir-Hinshelwood Equation,the constants K and k were found by experiment to be K=12.3 L/mmol and k=25.2×10-6 mol/h respectively.The reaction time can be shortened 2-3 hours when 10 mg/L Fe3+ or Ag+ is added in H-acid solution.The effects of dosage of catalyst,pH and concentration of Hacid in the solution on photocatalytic oxidation of H-acid were also studied.
出处
《环境科学》
CAS
CSSCI
CSCD
北大核心
1996年第4期7-10,共4页
Environmental Science
基金
国家"八五"科技攻关项目
关键词
二氧化钛
光催化氧化
H酸
染料
titanium dioxide,photocatalytic oxidation,H-acid.