硝酸改性活性炭對滲濾液中小分子有機物的吸附性能

摘要： 以硝酸為改性劑,分別采用浸漬和浸漬-高溫熱處理方法對活性炭進行了改性.低溫氮吸附結(jié)果表明,活性炭表面積和微孔體積在浸漬后都變小,再經(jīng)過高溫熱處理后則都變大.酸堿滴定顯示,改性后活性炭表面酸性都增大,其中浸漬的酸性最大.對填埋場滲濾液中小分子有機物進行了等溫線和動力學吸附實驗,結(jié)果發(fā)現(xiàn)改性后活性炭對有機物的吸附量增加;硝酸浸漬活性炭吸附速率降低,而浸漬-高溫熱處理則使吸附速率明顯加快.針對滲濾液中小分子有機物,硝酸浸漬-高溫熱處理的活性炭吸附效果最好,吸附量最大,吸附速率最快. Abstract： 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 HNO_3-immersionthermal method behaved best, because its adsorption capacity was biggest and the adsorption rate was fastest. 作 者： 宋建剛    岳東北    聶永豐    SONG Jian-gang    YUE Dong-bei    NIE Yong-feng   作者單位： 清華大學環(huán)境科學與工程系,北京,100084  期 刊： 環(huán)境化學  ISTICPKU   Journal： ENVIRONMENTAL CHEMISTRY  年，卷(期)： 2009, 28(6)  分類號： X13  關鍵詞： 活性炭    硝酸改性    吸附    小分子有機物    滲濾液.    Keywords： granular activated carbon    HNO_3 modification    adsorption    low molecular weight organic matter    leachate.   

【硝酸改性活性炭對滲濾液中小分子有機物的吸附性能】相關文章：

《硝酸》教案04-01

硝酸巡檢的主要工作職責是什么11-22

國內(nèi)外滲濾液處理技術的綜述工學論文08-08

人類“性能”的保留作文08-04

活性炭廠試用期工作總結(jié)09-24

技術性能保證書11-27

技術性能保證書02-18

《分子和原子》教案03-05

化學課《硫酸和硝酸的氧化性》教案范文01-01

[品牌]改性塑料項目可行性研究報告04-28