UV/Si-FeOOH/H_2O_2氧化降解水中邻苯二甲酸二甲酯

通过Si掺杂方式自制无定型Si-FeOOH催化剂,并将其用于UV/Si-FeOOH/H2O2光解体系降解内分泌干扰物邻苯二甲酸二甲酯(DMP),通过XRD、IR和SEM测试研究了Si-FeOOH的晶相结构,并与普通FeOOH进行铁溶出对比,研究pH值等因素对Si-FeOOH表面吸附和对协同体系降解DMP效能的影响.结果表明,通过Si掺杂所制得的Si-FeOOH为无定型结构,比表面积大,铁溶出率低;在Si/Fe摩尔比为0.2的Si-FeOOH投量为0.5 g/L,pH=5.0,H2O2浓度为2.0 mmol/L,125 W UV365条件下,DMP的降解效果显著,30 min内DMP降解率达到97%.与单一方法相比,UV、Si-FeOOH、H2O2三者的协同作用使得光-类Fenton可有效降解水中DMP,Si-FeOOH经多次循环使用后仍有较好的催化活性.

Degradation of Dimethyl Phthalate (DMP) in Aqueous Solution by UV/Si-FeOOH/H2O2

In this study the new catalyst Si-FeOOH was synthesized by adding Si to the traditional FeOOH and the mechanic strength of this new catalyst could be enhanced greatly. The photo-degradation of dimethyl phthalate (DMP) by UV/Si-FeOOH/H2O2 was investigated. The new catalyst Si-FeOOH was amorphous structure with high surface area and low soluble iron by XRD, IR and SEM. The efficiency of DMP degradation by UV/Si-FeOOH/H2O2 could reach 97% after 30 min reaction time at pH 5, 0.5 g/L dosage of Si-FeOOH, and 2.0 mmol/L of H2O2 under 125W UV365 irradiation. DMP could be degraded effectively by synergistic effect of UV, Si-FeOOH and H2O2. The Si-FeOOH photocatalyst can be very easily recovered and its catalytic activity also remained after several rounds of reaction.