作　　者： ; ; ;

机构地区： 北京林业大学环境科学与工程学院

出　　处： 《环境科学学报》 2014年第10期2477-2483,共7页

摘　　要： 以一种常见的环境修复材料竹柳为原料来制备竹柳基活性炭(WAC),考察了不同活化温度(400、450、500、550、600℃和650℃)对WAC性质及其除污染性能的影响,同时评估了制备过程中气态和液态副产物的生成规律与利用潜能.结果表明,随着活化温度的升高,WAC产率下降,热解油产率上升,而热解气产率相对稳定.六组WAC均具有较高的比表面积(BET),最高可达1526 m2·g-1,但BET值随活化温度的升高呈下降趋势;WAC的碘吸附值和亚甲基蓝吸附值最高可达1122.25 mg·g-1和415.50 mg·g-1,对重金属Pb2+和硝基苯的最大吸附量分别为9.20mg·g-1和4.21 mmol·g-1.WAC制备过程中热解气主要组分为H2、CH4、CO和CO2,随活化温度升高,H2和CH4含量上升,CO2含量下降,热解气的总燃烧热值升高.热解油的组分较为复杂,杂环类、烷烃类、烯烃类和有机酸类有机物含量较高,且随活化温度变化明显,在活化温度为650℃时,热解油的燃烧热最大. In the present work,willow bamboo based activated carbon(WAC) was prepared from a common phytoremediation materials-willow bamboo.The physical and chemical properties of WACs prepared at different activation temperatures(400 ℃,450 ℃,500 ℃,550 ℃,600 ℃ and 650 ℃) and their abilities to remove pollutants were examined.In the meantime,the compositions and utilization potential of the pyrolysis gases and oils generated during the preparation of WACs were investigated.The results indicated that,with the increase in activation temperature,the yields of WAC decreased,the yield of pyrolysis oils increased,while the yield of pyrolysis gases kept relatively stable.The specific surface areas of the prepared six WACs were all very high,with the highest value of 1526 m2·g-1.Increasing the activation temperatures gradually decreased its specific surface area.The adsorption capacity for iodine,methylene blue,Pb2+,and nitrobenzene of WACs was 1122.25,415.50,9.20 mg·g-1,and 4.21 mmol·g-1,respectively.The primary components of pyrolysis gases were H2,CH4,CO,and CO2.High activation temperature was in favour of the production of H2 and CH4,with the amount of CO2 reduced and the total combustion heat of pyrolysis gases improved.The components of pyrolysis oils were very complex,mainly containing heterocyclic,alkanes,alkenes,and organic acids,etc.The components of pyrolysis oils were significantly influenced by activation temperature,and the maximum combustion heat was obtained at the activation temperature of 650 ℃.

关 键 词： 活化温度 热解油 热解气 燃烧热

领　　域： [化学工程] [环境科学与工程]