摘要
在固定床吸附实验台上对低温等离子改性前后的复合钙基吸附剂进行脱汞实验,深入探究SO_2和O_2对具有较高孔隙率和比表面积的复合钙基吸附剂脱汞性能的影响.并通过多种表征手段和方法分析复合钙基吸附剂对Hg0的吸附机理.实验结果表明,由于等离子改性提高了吸附剂表面的含氧官能团的相对含量,经等离子改性的复合钙基吸附剂的脱汞效率有明显提高.在N2+0.07%SO_2+6%O_2气氛下,吸附剂脱汞效率相比于无氧气氛由23.7%增至91.2%,吸附剂脱汞效率明显提高.此时吸附剂表面的羟基、酯基官能团作为主要反应活性位点,而羰基官能团的作用不明显.O_2的存在促使活性炭表面由碳原子不饱和键形成的活性位增加,促进了Hg0的吸附,同时生成多种汞化合物.随着SO_2浓度升至0.15%,改性复合钙基吸附剂表面活性位再次出现不足,此时SO_2抢夺Hg0的吸附位点,脱汞效率降至23.3%.
The influence of SO2,O2 and non-thermal plasma treated on mercury removal by sorbent of high porosity and high specific surface area was investigated in a fixed bed bench.The mechanism of demercuration was analyzed by different characterization methods.As non-thermal plasma treatment increases relative content of oxygen-containing functional groups on the surface of sorbent,the study showed that the adsorption of mercury removal significant increases.In 0.07%SO2+6%O2atmosphere,the efficiency of mercury removal rose from 23.7%to 91.2%compared with which in the non-oxygen atmosphere.As active sites of the adsorption of Hg0,hydroxyl group and ester group improved the efficiency of demercuration.But the effect of carbonyl group was not obvious.It was due to the presence of O2 that the unsaturated bonds of carbon atoms was increased.With the increase of SO2 concentration to 0.15%,the competitive mechanism was the main effect.The efficiency of mercury removal dropped to 23.3%.
作者
白李一
段钰锋
丁卫科
胡鹏
韦红旗
张君
BAI Li-yi;DUAN Yu-feng;DING Wei-ke;HU Peng;WEI Hong-qi;ZHANG Jun(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China;School of Chemistry and Material Science,Huaibei Normal University,Huaibei 235000,China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第4期1280-1286,共7页
China Environmental Science
基金
国家重点研发计划(2016YFC0201105)
国家自然科学基金项目(51576044
51676041)
江苏省环保科研课题资助(2016030)
关键词
低温等离子
复合钙基吸附剂
脱汞
含氧官能团
non-thermal plasma
calcium-based composite sorbent
mercury removal
oxygen-containing functional groups
