摘要
以125W(Emax=365nm) Hg灯为中心光源,BDH 粉末TiO2为光催化剂,研究了在圆柱状硼硅玻璃反应器中自然水体腐殖酸的光催化脱色。研究涉及的影响因素有:反应液初始浓度,反应液初始pH和催化剂用量,并对光氧化、光催化和催化过程进行了比较。 结果发现光催化是一行之有效的去除水体颜色的方法。在C0=20 mg· L-1, pH=7, TiO2=1g·L-1 实验条件下,经2.5h 的光催化反应,大于95% 的颜色被脱除。增加催化剂用量,降低初始pH,可增加脱除效果。在研究的浓度范围内(C0≤20mg·L-1),光催化氧化脱色遵循准一级动力学方程。
In order to remove the color of humic acid in natural waters by photocatalysis, a series of experiments were conducted in a cylindrical borosilicon photoreactor with an effective volume of 280mL and a cooling water jacket using TiO2 as photocatalyst. A 125W UV lamp(Emax=365nm)was used as central light source. The effects of initial concentration of humic acid, initial pH of solution and TiO2 dosage on the photocatalytic process were investigated, and the comparison of photolysis, catalysis and photocatalysis was also conducted. The results showed that photocatalytic oxidation is an effective method for decolorization of the natural waters. Based on the following experimental conditions: C0=20mgL-1, pH=7, TiO2=1gL-1, above 95% color was removed under irradiation 2.5h. Increasing TiO2 dosage can increase the removal rate and acidic medium can also improve the efficiency of photocatalytic decolorization. In the range of our research(C0≤20mgL-1), the color removal rate could be described in terms of pseudo-first order kinetics.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2001年第6期591-595,共5页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金资助项目(29776032)
山西省自然科学基金资助项目(20001013)。
