零价铁氧化亚硫酸钠体系降解酸性橙废水的研究

Study on Degradation of Acid Waste Water by Fe^(0)/Sulfite System

采用零价铁-亚硫酸钠(Fe^(0)-Na_(2)SO_(3))相结合的新型氧化体系,以酸性橙7(Acid Orange 7,简称AO7)作为目标污染物,考察零价铁用量、亚硫酸钠浓度,反应初始pH值,以及外加Cl-的浓度对AO7脱色效果的影响。采用紫外可见吸收光谱法来测定底物浓度的变化。结果表明,Fe^(0)-Na_(2)SO_(3)体系在酸性环境下能够有效去除AO7。在水样初始pH=2,c(Na_(2)SO _(3))=0.3 mmol/L,c(Fe^(0))=0.06 g/L时,AO7的去除率最佳,达到78%。在Fe^(0)-Na_(2)SO_(3)体系中,外加Cl^(-)浓度对AO7的降解效果基本上没有影响。本次研究为酸性高盐废水的处理提供一种廉价、有效的研究方向。

A novel advanced oxidation process,combined zero-valent iron and sulfite(Fe^(0)-Na_(2)SO_(3))system was developed to degrade refractory organic contaminants.Azo dye acidOrange 7(AO7)wasselected as a representative organic pollutant.The effects of dosages of Fe^(0),sulfite,the initial pH,and chloride concentration on AO7 decoloration basic research were investigated.Changes in the concentration of AO7 were quantified by UV-Vis spectroscopy.Results showed that Fe^(0)/sulfite system effectively degraded AO7 in acid condition.The degradation efficiency of AO7 was optimal at c(Na_(2)SO_(3))=0.3 mmol/L,c(Fe^(0))=0.06 g/L and pH=2.78%ofAO7 was degraded after 1 h.Besides,chloride had little impact on the degradation of AO7.This study provided a cheap and effective research direction for the treatment of acidic high salt wastewater.