摘要
CH3NH2(一甲胺)作为一种重要的工业原料而被大量使用,其嗅阈值低,具有刺鼻的鱼臭味,是一种典型的恶臭气体.选取PS(过二硫酸盐)作为氧化剂,采用湿法吸收氧化去除CH3NH2.在探讨CH3NH2的吸收性能的基础上,比较了4种方式〔Fe2+活化PS、CA(柠檬酸)螯合Fe2+活化PS、Fe0活化PS、CA联合Fe0活化PS〕对CH3NH2湿法氧化去除效果的影响.结果表明:CH3NH2气体在酸性条件下易溶于水;单独用Fe2+或Fe0活化PS处理CH3NH2时,Fe0活化后的去除效果明显优于Fe2+;然而,在联合使用螯合剂CA之后,Fe2+活化的去除效果反而优于Fe0.CA螯合Fe2+的CH3NH2去除率由单独Fe2+活化时的32%升至64%,Fe0活化与CA联合Fe0活化去除率均提升至40%.究其原因,可能是由于不同活化方式下Fe2+释放速率不同所致,释放速率直接影响了Fe2+的存在时间,Fe2+活化PS速率对于氧化去除效果有影响,并最终影响CH3NH2的脱除.
Methylamine（ CH3NH2）,a typical odor with low olfactory threshold and fishlike smell,has been widely used as an important industrial raw material. Persulfate（ PS） was selected as an effective oxidant to remove the odorous gas CH3NH2 in a wet scrubber. The objectives of the present study was to study the absorption of CH3NH2 by water,and compare four different activated methods of PS to oxidatively remove CH3NH2,including Fe2 ＋activated PS,citric acid（ CA） chelating Fe2 ＋activated PS,Fe0 activated PS and CA uniting Fe0 activated PS. The results showed that the CH3NH2 gas could be easily dissolved in water under an acid condition. Different activated ways of PS led to different removal efficiencies of CH3NH2. Fe0 was better than Fe2 ＋when used to activate PS to remove CH3NH2. On the other hand,Fe2 ＋was more efficient than Fe0 when chelating agent CA was introduced. When using Fe2 ＋and CA uniting Fe2 ＋,the CH3NH2 removal ratios were 32% and 64%,respectively. Comparing the system of Fe0 with that of CA uniting Fe0,the ratio of CH3NH2 removal rose 40%. These results might be due to the different release rates of Fe2 ＋,which affected the decomposition of PS,and consequently influenced the CH3NH2 removal efficiency. The test method provided a reference for wet scrubbing oxidation removal of CH3NH2 odorous gas.
出处
《环境科学研究》
EI
CAS
CSSCI
CSCD
北大核心
2015年第9期1459-1465,共7页
Research of Environmental Sciences
基金
国家自然科学基金项目(21107101)
