Catalytic Oxidation Degradation For Aqueous Solution Of 2-chlorophenol And 4-chlorophenol

Chlorophenols, a kind of toxic and hardly biodegraded persistent organic pollutants, have environmental persistence, bioaccumulate, long distance migration ability and biological harmfulness, which easily lead to organisms endocrinopathy, reproductive and immune dysfunction, neurobehavioral and development disorders, as well as carcinogenic, teratogenic and mutagenic. Chlorophenols greatly harm the natural environment during the production and the use process. Effective degradation of chlorophenols is currently an important issue of strategic significance.In the past decade, foreign and domestic studies are more active in the development of the treatment technique of chlorophenols. The processing technologies are constantly updated and combined the mutual penetration methods to create new and unique approaches. Catalytic oxidation technology, an effective method of wastewater treatment, has attracted more and more attentions in recent years. Using the technology, chlorophenols is expected to be mineralized to CO2, water and other pollution-free inorganic by the oxidant, which could obtain the complete degradation of pollutants and non pollution treatment.This paper investigated the catalytic oxidation degradation of 2-chlorophenol (2-CP) and 4-chlorophenol (4-CP) solution with hydrogen peroxide as the oxidant. The catalyst components, catalyst preparation methods and the degradation conditions were optimized. The results showed that CuO/Al2O3 was an effective catalyst for the degradation of 2-CP and 4-CP solution. When CuO loading was 0.9 mmol/g and the catalyst was directly heated to 500℃, then calcined at this temperature for 4 h, the higher dechlorination rates of chlorophenols was obtained. The optimization reaction conditions were: 40℃, stirring speed of 30 r/min, initial pH of 9-10, reaction time of 360 min. Under the above conditions the dechlorination rates of 2-CP and 4-CP solution were 86% and 93% respectively.