吸附树脂负载铁酞菁光催化降解4-硝基苯酚

Photocatalytic degradation of 4-nitrophenol with iron phthalocyanine supported by polymeric resin

针对铁酞菁在水溶液中易于聚合而降低催化活性的问题,将铁酞菁负载在吸附树脂上,制得多相催化剂,该催化剂在可见光的照射下能有效地催化H2O2降解4-硝基苯酚.考察了可见光强度、催化剂用量、H2O2投加量、pH值、温度等因素对4-硝基苯酚去除效果的影响.结果表明:4-硝基苯酚初始质量浓度为50 mg/L,卤灯功率为50 W,催化剂投加量为2.0 g/L,H2O2用量为50 mmol/L,pH为5.7,温度为40℃时,反应540 min,4-硝基苯酚去除率达到92.2%,TOC去除率达到82.5%,且催化剂具有很好的稳定性,可重复使用.

Since iron phthalocyanine is apt to aggregation in aqueous solution which leads to decrease in catalytic activity, a supported catalyst was prepared by reaction between polymeric resin and iron. phthalocyanine. Under visible light irradiation, this catalyst is found to be highly effective for the degradation of 4-nitrophenol in the presence of H2O2. The effects of light intensity, catalyst amount, H2O2 concentration, pH value and temperature on the catalytic degradation are investigated. The re- suits show that when the initial solute concentration is 50 mg/L, the value of pH is 5.7, the catalyst dosage is 2. 0 g/L and the amount of H2O2 is 50 mmol/L, the removal rate of 4-nitrophenol and TOC are 92.2% and 82.5%, respectively, under irradiation of 50 W halogen lamp at 40 ℃ for 540 min. Furthermore, the catalyst is stable and reusable.