马缨丹生物炭对水中Pb(Ⅱ)污染的吸附研究  

Preparation of lantana biochar material and its adsorption behavior to Pb in water

作　　者：张杰[1,2] 贺敏婕 陈可欣 张山 黄艺[1,2] 彭书明[1,2] ZHANG Jie;HE Min-jie;CHEN Ke-xin;ZHANG Shan;HUANG Yi;PENG Shu-ming(College of Ecology and Environment,Chengdu University of Technology,Chengdu 610059,China;State Environmental Protection Key Laboratory of Synergistic Control and Joint Remediation for Soil and Water Pollution,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学生态环境学院,四川成都610059 [2]成都理工大学国家环境保护水土污染协同控制与联合修复重点实验室,四川成都610059

出　　处：《现代化工》2021年第7期122-127,共6页Modern Chemical Industry

基　　金：国家自然科学基金面上项目(41977289);四川省科技厅重大科技专项(2018SZDZX0022)。

摘　　要：在450℃的限氧条件下热解一种高风险的入侵植物马缨丹,成功合成了一种生物炭材料(LCB)。通过批量吸附实验探究了p H、吸附剂投加量和初始浓度等因素对LCB吸附重金属Pb^(2+)的影响,并评估了LCB去除铅离子的有效性,利用SEM和EDS等对LCB的相关结构与性质进行表征。结果表明,马缨丹在制备生物炭过程中形成了丰富的孔径结构,且能有效去除水溶液中的Pb^(2+)。通过Langmuir模型和拟二级动力学方程描述生物炭对铅的吸附行为,结果表明,吸附主要发生在单分子层,理论最大吸附量为75.74 mg/g,化学吸附是此过程的主要限速吸附机制。LCB,a new type of biochar material,is successfully synthesized by pyrolyzing Lantana,a high-risk invasive plant under an oxygen-limiting condition at 450℃ . Through batch adsorption experiments,the effects of p H,adsorbent dosage and initial concentration on the adsorption of Pb^(2+)by LCB is studied. The effectiveness of LCB in removing Pb^(2+)is evaluated,and the structure and properties of LCB is analyzed by SEM and EDS.It is shown that during the preparation of biochar,Lantana forms rich pores structure and can effectively remove Pb^(2+)from solutions. Langmuir model and pseudo-second-order kinetic equation can better describe the adsorption behavior of biochar to Pb^(2+),indicating that the adsorption mainly occurs in the monolayer. The theoretical maximum adsorption capacity is 75. 74 mg·g-1,and chemical adsorption is the main rate-limiting adsorption mechanism in this process.

关 键 词：马缨丹 生物炭 吸附 铅 

分 类 号：TB34[一般工业技术—材料科学与工程]