摘要
在300、450、600℃下制备了小麦秸秆生物炭(XM300、XM450、XM600),并进行了表征,研究了生物炭对水中四环素(TC)的吸附机理。结果表明,随热解温度的升高,生物炭比表面积与孔容积增加,孔径变小。准2级动力学方程和Langmuir等温模型更适合描述生物炭对TC的吸附,表明该吸附过程主要是受2种以上因素共同影响的单分子层吸附,生物炭对TC的吸附容量顺序为q(XM600)>q(XM450)>q(XM300)。颗粒内扩散方程拟合发现生物炭对TC的吸附包括快速外扩散与缓慢内扩散2个过程。pH影响了生物炭与TC之间的静电作用及π-π电子供体受体相互作用,导致吸附容量先减小后增大,在pH=9.02时最大。阳离子与TC之间的竞争作用导致生物炭对TC的吸附容量略有减小。
Wheat stalk biochars(XM300, XM450, XM600) were prepared under 300, 450 and 600 ℃ respectively and characterized, the adsorption mechanism of tetracycline(TC) was investigated. The results showed that the specific surface area and pore volume of biochars increased with increasing of pyrolysis temperature, while the pore size as decreased. The second order kinetics equation and the Langmuir isothermal model were more suitable to describe the adsorption of TC on biochars, which indicated that the adsorption process was single layer adsorption and affected by more than one factor.The adsorption capacity order of TC on biochars was q(XM600)>q(XM450)>q(XM300). The results of intra-particle model showed that there were two separate stages in TC adsorption on biochars, which were external diffusion and inter-particle diffusion. The adsorption capacity of TC on biochars decreased firstly and then increased due to the pH affected the electrostatic interaction and π-π electron donor acceptor interaction between biochar and TC. The maximum adsorption capacity of TC on biochars was found at pH was 9.02. The competition between cations and TC results in a slight decrease in the adsorption capacity of TC on biochars.
作者
谭珍珍
张学杨
骆俊鹏
方茹
史娟娟
王昌松
TAN Zhenzhen;ZHANG Xueyang;LUO Junpeng;FANG Ru;SHI Juanjuan;WANG Changsong(College of Environmental Engineering,Xuzhou University of Technology,Xuzhou 221018,China;Jiangsu Key Laboratory of lndustrial Pollution Control and Resource Reuse,Xuzhou 221018,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2019年第2期32-38,共7页
Technology of Water Treatment
基金
江苏省高等学校自然科学研究重大项目(18KJA610003)
徐州市科技计划项目(KC18150)
徐州工程学院培育项目(XKY2017121)
关键词
生物炭
抗生素
四环素
吸附
小麦秸秆
biochar
antibiotic
tetracycline (TC)
adsorption
wheat stalk
