摘要
利用硝酸对竹炭进行改性,以提高其吸附能力.研究竹炭投加量、吸附时间、吸附温度、pH等因素对改性竹炭吸附氨氮的影响,并初步探讨竹炭吸附氨氮的机理.实验表明:竹炭的表面化学性质和表面结构特性分别影响其化学吸附能力和物理吸附能力.改性竹炭相对于未改性竹炭,其表面酸性含氧官能团量G、比表面积S、孔比容积Vp明显增大,氨氮的最高吸附去除率由20.1%提高至82.2%,吸附平衡时间由未改性时的6h缩短至4h.氨氮在竹炭上的吸附等温方程可与Freundlich模型较好拟合.竹炭投加量、吸附时间、吸附温度、pH等因素对改性竹炭吸附能力有明显影响.
Bamboo-carbon was modified by nitric acid to enhance its absorption capacity.The effects of various parameters such as absorbent dosage,absorption time,absorption temperature and pH on ammonia nitrogen absorption efficiency of bamboo-carbon were investigated,meanwhile the absorption mechanism of ammonia nitrogen by modified bamboo-carbon was studied.The results showed that the ammonia nitrogen absorption capacity of bamboo-carbon was affected by both chemical and structural properties of the bamboo-carbon surface.Compared with bamboo-carbon,the surface properties of modified bamboo-carbon such as oxygen-containing functional groups,specific surface areas,total pore volume were higher,ammonia nitrogen removal ratio was increased from 20.1% to 82.2%,absorption equilibrium time decreased from 6 h to 4 h.Absorption of ammonia nitrogen by bamboo-carbon could be described by Freundlich equation.Furthermore,the absorption performance of modified bamboo-carbon was obviously affected by such parameters as absorbent dosage,absorption time,absorption temperature and pH.
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2007年第5期584-590,共7页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家自然科学基金重点资助项目(305230250)
浙江省科技厅重大专项资助项目(2006C13036)
浙江省教育厅资助项目(20060650).
关键词
竹炭
改性
吸附
性能
氨氮
bamboo-carbon
modification
absorption
performance
ammonia nitrogen
作者简介
周珊（1968-），女，湖北黄石人，硕士，副教授．硕士生导师．主要从事工农业环境保护及治理方面的研究．Tel：0571—63741360；E—mail：zhoushan1105@163.com．
