秸秆生物炭对Pb2+的吸附性能及影响因素研究  

Research on the Adsorption Property and Effect Factors of Pb2+ on Straw Biochar

作　　者：常帅帅 张学杨[2,3] 王洪波 李梅[1] 谭珍珍[2,3] CHANG Shuai-shuai;ZHANG Xue-yang;WANG Hong-bo;LI Mei;TAN Zhen-zhen(School of Municipal and Environmental Engineering,Shandong Jianzhu University,Jinan 250000,China;School of Environmental Engineering,Xuzhou Institute of Technology,Xuzhou 221111,China;Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse,Xuzhou 221018,China)

机构地区：[1]山东建筑大学市政与环境工程学院,山东济南250101 [2]徐州工程学院环境工程学院,江苏徐州221018 [3]江苏省工业污染控制与资源化重点实验室,江苏徐州221018

出　　处：《环境科技》2019年第6期23-28,共6页Environmental Science and Technology

基　　金：国家自然科学基金(51878394);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(KC-18150)

摘　　要：热解制备了秸秆生物炭,表征了生物炭理化性质,研究了其对Pb2+的吸附动力学、等温线及影响因素。结果表明:玉米秸秆生物炭比表面积大于小麦秸秆生物炭,前者对Pb2+吸附容量(47.28~71.80 mg/g)高于后者(42.89~59.49 mg/g),6种生物炭对Pb2+的吸附均符合伪二级动力学方程,表明该吸附受多种因素影响;Freundlich方程对等温吸附结果拟合优于Langmuir,表明生物炭对Pb2+吸附为多分子层物理吸附;生物炭对Pb2+的吸附容量随pH值的提高先增大后减小;溶液中的Na+和K+不利于生物炭对Pb2+的吸附,Ca2+有利于吸附。Straw biochars were pyrolyzed and characterized,then the adsorption kinetics,isotherms and influence factors of Pb2+on those biochars were investigated.The results showed that the specific surface area of corn stalk biochar was higher than that of wheat straw biochar,thus the Pb2+adsorption capacity on the former biochars(47.28~71.80 mg/g)was higher than the latter ones(42.89~59.49 mg/g).Besides,the adsorption of Pb2+on all of the 6 biochars belongs to the pseudo second-order kinetic equation,which indicating the adsorption was affected by more than one factor.Moreover,the Freundlich equations fit the adsorption better than the Langmuir,which suggesting the adsorption was dominated by multi-molecular physical adsorption.The Pb2+adsorption capacity on biochar increased firstly and then decreased with gradually elevating the pH value.Furthermore,Na+and K+had adverse impact on the adsorption,while Ca2+was beneficial for the adsorption.

关 键 词：生物炭 重金属 吸附 PB 秸秆 

分 类 号：X5[环境科学与工程—环境工程]