摘要
以硝酸为改性剂,分别采用浸渍和浸渍-高温热处理方法对活性炭进行了改性.低温氮吸附结果表明,活性炭表面积和微孔体积在浸渍后都变小,再经过高温热处理后则都变大.酸碱滴定显示,改性后活性炭表面酸性都增大,其中浸渍的酸性最大.对填埋场渗滤液中小分子有机物进行了等温线和动力学吸附实验,结果发现改性后活性炭对有机物的吸附量增加;硝酸浸渍活性炭吸附速率降低,而浸渍-高温热处理则使吸附速率明显加快.针对渗滤液中小分子有机物,硝酸浸渍-高温热处理的活性炭吸附效果最好,吸附量最大,吸附速率最快.
Granular activated carbons （GAC） were treated with nitric acid as modifier by immersion and immersionthermal method, respectively. The results of low temperature nitrogen adsorption indicated surface areas and micropore volumes of GAC decreased after immersion while increased after the subsequent thermal treatment. Acid/base titrations showed GAC surface acidities were raised after modification, and the acidity by immersion was stronger. The adsorption isotherm and kinetics studies were carried out with low molecular weight organic matter （LMWOM） in municipal solid waste landfill leachates. It was found the adsorption capacities were raised after modification, and the adsorption rate was decreased by immersion while obviously increased by immersion-thermal treatment. For adsorption of LMWOM in leachates, GAC modified by HNO3-immersionthermal method behaved best, because its adsorption capacity was biggest and the adsorption rate was fastest.
出处
《环境化学》
CAS
CSCD
北大核心
2009年第6期788-792,共5页
Environmental Chemistry
基金
"十一五"国家科技支撑计划重点项目(2006BAC06B05
2006BAC06B01)
北京市科技计划项目(D08040600350804)资助
关键词
活性炭
硝酸改性
吸附
小分子有机物
渗滤液
granular activated carbon
HNO3 modification
adsorption
low molecular weight organic matter
leachate
