摘要
为了使以牛粪生物炭为吸附剂在去除水体中的氨氮得到应用,进行了牛粪生物炭去除氨氮的影响因素及吸附特性研究.结果显示:当牛粪裂解温度为500℃时,在碱性条件下,牛粪生物炭的添加量大于20g/L时,NH+4初始质量浓度为50mg/L时,对水中氨氮的去除率最佳.但随着投加量的增加,单位吸附量呈减小趋势,而随着NH+4初始质量浓度增加,单位吸附量从增加速率显著到趋于减缓.牛粪生物炭吸附平衡时间为80min.朗缪尔方程比弗罗因德利希方程能更好地拟合牛粪生物炭吸附水中氨氮等温过程,为自发的吸热、单分子层吸附;其吸附过程符合准二级动力学方程,主要为化学吸附,并伴随着物理吸附过程.
To enable the application of biochar,which is derived from dairy manure as raw material,on removing ammonia nitrogen from aqueous solutions,the influential factors and adsorption properties of dairy manure biochar in the removal of ammonia nitrogen from aqueous solution are studied.The result shows that,when the temperature of dairy manure biochar pyrolysis is 500 ℃,the solution is alkaline solution,the amount of dairy manure biochar is more than 20g/L,and the initial ammonia nitrogen mass concentration is 50mg/L,the adsorbing effectiveness of dairy manure biochar on ammonia nitrogen is optimal. However,under the same initial mass concentration conditions,the acceleration rate of adsorbing ammonia nitrogen increases significantly at first,but diminishes as the dosage of manure biochar increases.The adsorption equilibrium time of manure biochar is about 80 minutes.The Langmuir isotherm equation can better describe the isothermal adsorption behavior than the Freundlich sotherm equation.The adsorption behavior of biochar on ammonia nitrogen is monolayer adsorption and pertains to spontaneous endothermic process.The adsorbing process conforms to the Quasi Secondary Dynamics Equation,and the adsorption is mainly chemical adsorption accompanied by physical adsorption process.
出处
《沈阳大学学报（自然科学版）》
CAS
2016年第3期186-190,共5页
Journal of Shenyang University：Natural Science
基金
科技部中德科技合作项目(S2012ZR01912)
国家重点基础研究发展计划项目[973项目](2014CB441106)
沈阳科技计划项目(F14-133-9-00)
关键词
生物炭
牛粪
吸附
氨氮
biochar
dairy manure
adsorption
ammonium
