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林产化学与工业 ›› 2022, Vol. 42 ›› Issue (3): 41-48.doi: 10.3969/j.issn.0253-2417.2022.03.006

• 研究报告 • 上一篇    下一篇

甘蔗渣基磷掺杂活性炭电极对Cu2+电吸附性能研究

熊永志1(), 刘艳艳1, 王贵龙1, 卢贝丽1, 黄彪1, 林冠烽1,*()   

  1. 1. 福建农林大学 材料工程学院,福建 福州 350002
    2. 福建农林大学 金山学院,福建 福州 350002
  • 收稿日期:2021-08-27 出版日期:2022-06-28 发布日期:2022-07-04
  • 通讯作者: 林冠烽 E-mail:Yongzhi.X@foxmail.com;feton.lin@hotmail.com
  • 作者简介:林冠烽,副教授,硕士生导师,主要从事林产化学与工业的研究;E-mail:feton.lin@hotmail.com
    熊永志(1995—),男,江西南昌人,硕士生,研究方向为生物质能源与碳材料;E-mail:Yongzhi.X@foxmail.com
  • 基金资助:
    南平市资源产业科技创新联合资助项目(N2020Z006);福建省高校新世纪优秀人才支持计划(2017);国家自然科学基金资助项目(32171726)

Electrosorption of Copper Ions on Bagasse-based Phosphorus-doped Activated Carbon Electrode

Yongzhi XIONG1(), Yanyan LIU1, Guilong WANG1, Beili LU1, Biao HUANG1, Guanfeng LIN1,*()   

  1. 1. College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China
    2. Jinshan College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2021-08-27 Online:2022-06-28 Published:2022-07-04
  • Contact: Guanfeng LIN E-mail:Yongzhi.X@foxmail.com;feton.lin@hotmail.com

摘要:

以甘蔗渣为碳源、植酸为磷源和活化剂,制备了甘蔗渣基磷掺杂活性炭(PAC-900),并将其作为电极用于铜离子的电吸附。采用氮气吸附-脱附等温线、XPS和SEM-EDX等对样品的孔隙结构、表面化学性质及元素组成进行表征;通过循环伏安(CV)、恒流充放电(GCD)实验对磷掺杂活性炭的电化学性能进行测试。研究结果表明:当Cu2+初始质量浓度为100 mg/L时,PAC-900对Cu2+的电吸附量高达86.85 mg/g,远高于未掺杂活性炭(C-900)的35.15 mg/g,循环吸附-脱附10次后吸附量仍可达45.38 mg/g。植酸活化可以使制得的磷掺杂活性炭比表面积高达1 671.75 m2/g,总孔容积和微孔容积分别达到1.33和0.09 cm3/g,其电化学性能和亲水性显著提高。磷掺杂活性炭对Cu2+的吸附过程主要受双电层吸附和法拉第吸附的影响,吸附等温线和吸附动力学分析表明吸附过程符合Freundich等温式和准二级动力学过程,说明吸附过程不仅存在单层吸附,也存在多层吸附;XPS和SEM-EDX分析表明P元素主要以C—P—O、C—O—P和C—P=O的形式存在,C—P极少,其中C—P=O对Cu2+的法拉第吸附贡献最大。

关键词: 甘蔗渣, 磷掺杂, 活性炭, 电吸附, 铜离子

Abstract:

Bagasse-based phosphorus-doped activated carbon(PAC-900) was prepared with bagasse as carbon source, phytic acid as phosphorus source and activator, and used as electrode for the electrosorption of Cu2+. The pore structure, surface chemical properties and elemental composition of the samples were characterized by nitrogen adsorption-desorption isotherm, XPS and SEM-EDX. The research results showed that when the initial concentration of Cu2+ was 100 mg/L, the electrosorption of Cu2+ by PAC-900 was as high as 86.85 mg/g, which was much higher than 35.15 mg/g of undoped activated carbon(C-900). After 10 times of desorption, the adsorption capacity could still reach 45.38 mg/g. The activation of phytic acid could produce the activated carbon with the specific surface area as high as 1 671.75 m2/g, and the total pore volume and micropore volume of 1.33 cm3/g and 0.09 cm3/g, respectively, which could significantly improve its electrochemical performance and hydrophilicity. The adsorption process was mainly affected by the electric double layers adsorption and Faraday adsorption. The adsorption isotherm and adsorption kinetic process analysis showed that the adsorption process conformed to the Freundich isotherm and pseudo-second-order kinetic process, it indicated that there was not only single-layer adsorption but also multi-layer adsorption in the adsorption process; XPS and SEM-EDX analysis results showed that the P element mainly existed in the form of C—P—O, C—O—P and C—P=O, and C—P was very rare, among which C—P=O contributed the most to the Faradaic adsorption of Cu2+.

Key words: bagasse, phosphorus-doped, activated carbon, electrosorption, copper ions

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