UV/H_2O_2协同净化丙酮气体的性能及机理

Properties and mechanism of synergistic purification acetone gas by UV/H_2O_2

丙酮气体是制药行业排放的主要污染物之一。选取丙酮气体作为研究对象,系统考察了双氧水在不同工艺条件下及其联合UV对丙酮气体的净化性能,并借助气相色谱-质谱仪对净化后气相和液相产物进行定性分析。研究结果表明:当吸收氧化体系的pH为3左右,氧化还原电位介于400~450 mV之间,丙酮气体进气浓度为650~670 mg·m^(-3)时,丙酮气体的去除效率最高,达85%以上;辅助UV光照,有利于氧化性极强的·OH的产生,可有效提高丙酮气体的去除率近8%。产物相中除未反应的丙酮和少量乙酸外,无其他中间产物被检出。

Acetone gas is one of the main pollutants from the pharmaceutical industry and as such was chosen as the subject of this research. The purification properties of acetone gas by H2O2 and H2O2 combined with UV un- der different process conditions were studied, and the gas and liquid phase products were qualitatively analyzed by gas chromatography-mass spectrometry （GC-MS）. The results showed that when the pH was approximately 3, ox- idation reduction potential was from 400 to 450 mV,and inlet concentration was from 650 to 670 mg · m^-3, the removal efficiency of acetone gas was highest,up to 85%. The removal rate of acetone gas purified by UV/H202 was approximately 8% higher than it was by H2O2 ,because more · OH were created when H2O2 was combined with UV. The remaining acetone and a small amount of acetic acid were detected in the products,but no other materials were.