中文关键词海藻酸钙生物炭吸附机制Pb (Ⅱ) 英文关键词calcium alginatebiocharadsorptionmechanismlead (Ⅱ)

作者	单位	E-mail
于长江	昆明理工大学环境科学与工程学院, 昆明 650500 海南师范大学化学与化工学院, 水环境污染治理与资源化重点实验室, 海口 571158	313689820@qq.com
董心雨	海南师范大学化学与化工学院, 水环境污染治理与资源化重点实验室, 海口 571158
王苗	海南师范大学化学与化工学院, 水环境污染治理与资源化重点实验室, 海口 571158
林强	昆明理工大学环境科学与工程学院, 昆明 650500 海南师范大学化学与化工学院, 水环境污染治理与资源化重点实验室, 海口 571158	linqianggroup@163.com

中文摘要 利用海藻酸钙（CA）包覆生物炭（BC）制备了一种新型复合材料（CA/BC），用以吸附水溶液中的Pb（Ⅱ）.系统研究了溶液的初始浓度、pH、时间对吸附的影响.BC和CA/BC吸附Pb（Ⅱ）等温热力学数据符合Langmuir模型，在pH=5的条件下对Pb（Ⅱ）的最大吸附量分别为93.20 mg·g^-1和155.04 mg·g^-1.BC吸附Pb（Ⅱ）动力学数据符合准二级动力学模型，化学吸附是速率控制步骤.CA/BC吸附Pb（Ⅱ）动力学数据符合准一级动力学模型，扩散是速率控制步骤.结果表明CA/BC吸附Pb（Ⅱ）的机制主要包括形成配合物，以及Ca（Ⅱ）与Pb（Ⅱ）发生离子交换. 英文摘要 A microsphere (CA/BC) was prepared using biochar (BC) encapsulated with calcium alginate (CA) as a green adsorbent for Pb(Ⅱ) removal from aqueous solution. The effects of the initial Pb(Ⅱ) concentration, initial pH value of the Pb(Ⅱ) solution, and equilibrium contact time were investigated. The isothermal thermodynamic data of the BC and CA/BC conformed to the Langmuir model. The maximum adsorption capacities of the BC and CA/BC from the Langmuir equation were 93.20 mg·g^-1 and 155.04 mg·g^-1 respectively, at pH=5. The adsorption of Pb(Ⅱ) by the BC was in good agreement with the pseudo-second-order equation, indicating that chemisorption was the rate-controlling step. The adsorption of Pb(Ⅱ) by the CA/BC was in good agreement with the pseudo-first-order model, which suggested that the rate-limiting step was governed by diffusion. Mechanism studies for Pb(Ⅱ) removal by the CA/BC showed that the nature of Pb(Ⅱ) abstraction took place through ion exchange between Ca(Ⅱ) and Pb(Ⅱ) as well as via the formation of a coordination complex.

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