摘要
采用浸渍法在活性炭上负载铁制备催化剂Fe/AC,用于催化臭氧氧化水中内分泌干扰物双酚A(BPA),研究了Fe/AC/O3体系的协同效应,探讨了Fe/AC投加浓度、臭氧浓度和BPA初始浓度等工艺参数的作用规律,并分析了Fe/AC/O3体系在不同pH值下的催化反应机制。结果表明,在Fe/AC/O3体系下,反应60 min后,BPA和COD的去除率分别为97.44%和69.47%,效果明显优于臭氧体系的70.15%、30.89%和活性炭体系的14.69%、7.53%之和,具有明显的协同作用;Fe/AC/O3体系降解BPA符合一级反应动力学,当Fe/AC的投加浓度为5.0 g/L,臭氧浓度为15.0 mg/L,BPA初始浓度为50.0 mg/L时,Fe/AC/O3体系降解BPA的反应速率常数为0.05972 min-1;其反应机制受溶液pH值的影响,在酸性条件下是吸附和臭氧直接氧化共同作用,而在碱性条件下以·OH间接氧化为主,活性炭上负载的Fe3+促进了·OH的生成,大大提高了BPA的反应效率和矿化率。
The degradation of bisphenol A（BPA） in aqueous solution was studied by catalytic ozonation with Fe^3＋ loaded activated carbon（Fe/AC） which was prepared with ferric nitrate supported on activated carbon by impregnation. The synergistic effect of Fe/AC/O3 process was explored by comparing the degradation efficiency of BPA in four processes （ozonation alone, nitrogen integrated with activated carbon, ozonation integrated with activated carbon and ozonation integrated with Fe/AC）. The operational parameters such as catalyst concentration, ozone concentration, and the initial concentration of BPA in the Fe/AC/O3 process were carefully optimized. And the reaction mechanism of Fe/AC/O3 process under different pH value was discussed. The results show that the BPA and COD removal rates can reach to 97.44%, 69.47% at 60 rain respectively in the Fe/AC/O3 system, and are significantly better than the sum of ozonation alone（70.15%, 30.89%） and activated carbon alone（14.69%, 7.53%）, showing the great synergistic effect. The kinetics modeling indicates that the degradation of BPA is the pseudo first-order reaction, and the rate constant is 0.05972 min^-1 under the conditions of the catalyst concentration 5.0 g/L, ozone concentration 15.0 mg/L, and BPA initial concentration 50.0 mg/L. The catalytic reaction mechanism can be influenced by pH values： the organic pollutions can be removed by adsorption and direct ozone oxidation under acidic condition, and mainly by ·OH indirect oxidation under alkaline condition. The reaction rate constant and mineralization rate can be greatly increased by Fe^3＋ loading on activated carbon through accelerating the generation of ·OH.
出处
《辽宁化工》
CAS
2014年第6期664-667,共4页
Liaoning Chemical Industry
基金
四平市科技发展计划项目
项目号:四科合字2012041号
2013年吉林省大学生创新创业训练计划
