【摘要】 为了去除饮用水中的痕量对氯硝基苯(pCNB),以实验室制备的硅酸锌为催化剂考察催化臭氧氧化对pCNB的去除能力.利用N2吸附,傅里叶转换红外光谱技术对催化剂的比表面积、孔容、孔径分布以及表面官能团进行了表征.探讨了m(O3)/m(pCNB),催化剂投加量和水质因素对催化臭氧氧化去除pCNB的影响.实验结果表明,硅酸锌在蒸馏水和自来水本底中,均表现出显著的催化活性.在去离子水本底条件下,催化臭氧氧化可以使pCNB去除率提高47%;在自来水本底条件下也可提高25%.在去离子水本底条件下臭氧与pCNB的最佳质量比为6,催化剂最佳投量为200 mg.L-1,水中重碳酸盐/碳酸盐碱度和水中腐植酸浓度对硅酸锌催化臭氧氧化去除pCNB有一定的抑制作用.更多还原

【Abstract】 Laboratory synthesized zinc silicate was tested for its activity in catalytic ozonation of trace p-chloronitrobenzene(pCNB) in aqueous solutions.The physicochemical features including specific surface area,total pore volume,distribution of pore size and functional groups of the catalysts were characterized by N2 adsorption and Fourier Transform Infrared(FTIR) spectrum analysis.Effects of the mass ratio of O3 and pCNB,catalyst dose,and concentration of bicarbonate ion and humic acid on pCNB removal were also investigated.The results show that the zinc silicate was activated in catalytic ozonation for degradation of pCNB not only in distilled water,but also in tap water.Compared with the ozone alone,in deionized water conditions,catalyzed ozonation can enhance the removal efficiency of pCNB by 47%;in tap water conditions,catalyzed ozonation can enhance the removal efficiency of pCNB by 25%.In the present experimental conditions,the optimal mass ratio of O3 and pCNB along with the catalyst dosage were 6 and 200 mgL-1,respectively.The concentrations of bicarbonate/carbonate and humic acid in water can significantly reduce the degradation efficiency of pCNB in an aqueous solution.更多还原