摘要
以芦苇、小麦秸秆和竹子为原料,利用回流式炭化工艺制备3种生物炭。比较三者对NH_4^+-N、PO_4^(3-)-P的吸附性能,并对三者吸附性能差异的成因进行分析。实验结果表明:3种生物炭对PO_4^(3-)-P的吸附效果整体上优于NH_4^+-N,因为3种生物炭的阳离子交换容量CEC值和Zeta电位绝对值的水平均较低,不利于阳离子的吸附;竹炭Z-C对NH_4^+-N的吸附效果最佳,6 h去除率为3.59%,低的N含量、pH及Zeta电位绝对值对NH_4^+-N的吸附有利;芦苇炭LW-C中的O更多地与K、Mg等结合,形成能够与PO_4^(3-)反应生成磷酸盐沉淀或者晶体物质的金属氧化物,从而具有最好的PO_4^(3-)-P的吸附效果,6 h时去除率达16.91%。
Using reed,wheat straw and bamboo as raw materials,three kinds of biochars were prepared by reflux carbonization process. The adsorption abilities of the 3 biochars to NH4^+-N and PO4^3--P were compared,and the causes of the differences were analyzed. The results showed that:The adsorption abilities of the 3 biochars to PO4^3--P were better than that to NH4 +-N on the whole,because of the low CEC and absolute values of Zeta potential of biochars,which were not conducive to the adsorption of cations;Bamboo charcoal Z-C had the best adsorption ability to NH4^+-N with 3.59% of removal rate at 6 h,because its low TN content,pH and absolute value of Zeta potential were beneficial to NH4^+-N adsorption;Reed charcoal LW-C had the best adsorption ability to PO4^3-P with 16.91% of removal rate at 6 h,because O in LW-C was most combined with K and Mg to form metal oxides which could react with PO4^3- to form phosphate precipitates or crystalline substances.
作者
鲁小娟
田小平
王磊
LU Xiaojuan;TIAN Xiaoping;WANG Lei(State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)
出处
《化工环保》
CAS
CSCD
北大核心
2019年第2期196-201,共6页
Environmental Protection of Chemical Industry
基金
国家重点研发计划项目(2017YFC0506004)
浦东新区科技发展基金项目(PKJ2015-C11)
浦东新区环保局科研课题(2016012)
关键词
芦苇
小麦秸秆
竹子
生物炭
吸附
氨氮
磷酸盐
reed
wheat straw
bamboo
biochar
adsorption
ammonia-nitrogen
phosphate
