摘要
以小麦秸秆和活性污泥为原料,在3种温度下热解制备生物炭,使用傅立叶红外光谱(FTIR)和扫描电镜(SEM)对其结构和性能进行表征,探究了以不同生物炭为载体,以解磷菌为固定化菌株制备的固定化微生物对Pb^(2+)的吸附能力,同时研究了吸附时间和热解温度对固定化微生物吸附Pb^(2+)的影响。结果表明:小麦秸秆生物炭较活性污泥生物炭的表面官能团更为丰富,且小麦秸秆生物炭的芳香化程度随热解温度升高而增加;随着热解温度的升高,小麦秸秆生物炭的微孔逐渐发展,孔壁变薄,孔隙结构更为发达;以700℃热解的小麦秸秆生物炭为载体制备的固定化微生物(IBWS700)对Pb^(2+)的吸附量最高,对Pb^(2+)的吸附量可达89.39mg/g;IBWS700对Pb^(2+)的吸附动力学符合准二级动力学方程;IBWS700对Pb^(2+)的吸附可以用Langmuir模型较好地拟合。
Biochar was prepared by pyrolysis of activated sludge and wheat straw at three different temperatures in this study.The surface morphology and properties of the biochar were characterized by SEM and FTIR.The adsorption capacity of immobilized microorganisms prepared by different biochar as carrier and phosphate-solubilizing bacteria as immobilized strains for Pb^2+was investigated.The effects of the contact time and pyrolysis temperature on the adsorption process of Pb^2+were studied.The results showed that wheat straw biochar had more surface functional groups compared with activated sludge biochar.With the increase of pyrolysis temperature,the aromaticity of wheat straw biochar increased,the micropores of wheat straw biochar gradually increased,the pore wall became thinner and the pore structure was developed well.The immobilized microorganism prepared by wheat straw biochar which was prepared at 700℃(IBWS700)had the highest adsorption capacity of Pb^2+,and its adsorption capacity could reach 89.39 mg/g.Adsorption kinetics showed that the experimental data were fitted well by the pseudo-second-order kinetic equation.The adsorption of Pb^2+by IBWS700 could be well fitted with the Langmuir model.
作者
张杰
朱晓丽
尚小清
王军强
杨乃成
严亚娟
ZHANG Jie;ZHU Xiaoli;SHANG Xiaoqing;WANG Junqiang;YANG Naicheng;YAN Yajuan(College of Urban and Environmental Science,Northwest University,Xi’an Shaanxi 710127;Xi’an Jinborui Ecological Technology Co.,Ltd.,Xi’an Shaanxi 710065)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2019年第4期387-392,共6页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.3120083)
科技惠民计划项目(No.2012GS610203-2)
陕西省科技计划项目(No.2011JY015)
关键词
生物炭
热解温度
固定化微生物
PB^2+
吸附
吸附动力学
biochar
pyrolysis temperatures
immobilized microorganisms
Pb^2+
adsorption
adsorption kinetics
