Al-O_(2)-酸体系降解苯酚的研究

Study of phenol degradation in Al-O_(2)-acid system

研究了Al–O_(2)–酸体系对水中苯酚的降解。实验表明在ρ(Al)=4g/L,ρ(溶解氧)=9.08mg/L,pH=2的条件下,20mg/L苯酚降解5h,去除率可达99.71%。以亚甲基蓝为·OH的捕集剂,采用分光光度法间接测定·OH产生过程,DMP(2,9–二甲基–1,10–菲啰啉)分光光度计测定H_(2)O_(2)浓度。Al–O_(2)–酸体系是一个Al介导的过程,其中Al^(0)(零价铝)诱导·OH,然后氧化苯酚。H_(2)O_(2)的增减趋势与·OH检测浓度和苯酚降解趋势一致。苯酚在Al–O_(2)–酸体系中的降解具有明显的pH依赖性,并遵循伪一级动力学。在实验条件下,苯酚降解的表观活化能为74.49kJ/mol。Al–O_(2)–酸体系在含苯酚废水的降解中效率高、成本低,应用前景良好。

The degradation of phenol in water in Al-O_(2)-acid system was investigated.The experiments showed that under the conditions ofρ(Al)=4 g/L,p(dissolved oxygen)=9.08 mg/L and pH=2,20 mg/L phenol was degraded for 5 h,and the removal rate could reach 99.71%.Methylene blue was used as the trapping agent for-OH,and the production process of-OH was indirectly determined by spectrophotometry,and the concentration of H_(2)O_(2)was determined by DMP(2,9-dimethyl-1,10-phenanthroline)spectrophotometer.Al-O_(2)-acid system is an Al-mediated process,wherein the Al^(0)(zero-valent aluminum)induces-OH,and then oxidizes phenol.The increase and decrease trends of H_(2)O_(2)are consistent with the determined concentration of-OH and the degradation trend of phenol.The degradation of phenol in the Al-O_(2)-acid system was clearly pH-dependent and followed pseudo-first-order kinetics.Under the test conditions,the apparent activation energy of phenol degradation was 74.49 kJ/mol.The Al-O_(2)-acid system is efficient and cost-effective,and has a promising application prospect in the degradation of phenol-containing wastewater.