NF/PDMA/MnO2-Co电容电极对低浓度Pb2+的电吸附特性

doi:10.11901/1005.3093.2020.193

材料研究学报

2021, Vol. 35

Issue (2): 115-127 DOI: 10.11901/1005.3093.2020.193

研究论文

本期目录 | 过刊浏览

NF/PDMA/MnO₂-Co电容电极对低浓度Pb²⁺的电吸附特性

唐长斌¹(

), 牛浩², 黄平¹, 王飞², 张玉洁¹, 薛娟琴¹

^1.西安建筑科技大学化学与化工学院西安 710055
^2.西安建筑科技大学冶金工程学院西安 710055

Electrosorption Characteristics of NF/PDMA /MnO₂-Co Capacitor Electrode for Pb²⁺in a Dilute Solution of Lead Ions

TANG Changbin¹(

), NIU Hao², HUANG Ping¹, WANG Fei², ZHANG Yujie¹, XUE Juanqin¹

^1.School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
^2.School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

引用本文:

唐长斌, 牛浩, 黄平, 王飞, 张玉洁, 薛娟琴. NF/PDMA/MnO₂-Co电容电极对低浓度Pb²⁺的电吸附特性[J]. 材料研究学报, 2021, 35(2): 115-127.
Changbin TANG, Hao NIU, Ping HUANG, Fei WANG, Yujie ZHANG, Juanqin XUE. Electrosorption Characteristics of NF/PDMA /MnO₂-Co Capacitor Electrode for Pb²⁺in a Dilute Solution of Lead Ions[J]. Chinese Journal of Materials Research, 2021, 35(2): 115-127.

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摘要:

在泡沫镍基体上进行阳极电沉积制备了NF/PDMA/MnO₂-Co电极，使用FESEM-EDS、XPS和Raman谱、循环伏安和电容吸脱附测试等手段表征了复合电极的结构和评价其电容特性和对Pb²⁺的吸附行为。结果表明，在电流密度为1 mA/cm²、30℃和3 min条件下制备的NF/PDMA/MnO₂-Co复合电极，在Pb²⁺浓度为20 mg/L的模拟废水中有比较高的比电容值(208.8 F/g)，对Pb²⁺有较高的吸附容量(59.9 mg/g)；PDMA底层与Co掺杂MnO₂表层的协同作用提高了MnO₂电极电容和吸附性能；吸附动力学拟合表明，复合电极的吸附过程受物理、化学吸附混合控制，并受离子传质和孔隙内扩散的限制；电极的稳定性好，4次循环吸附后的吸附量仍达到51.7 mg/g。

关键词 ：材料表面与界面, MnO₂电极, 电沉积, Pb²⁺, 电容去离子

Abstract：

NF/PDMA/MnO₂-Co electrode was prepared by anodic electrodeposition on the foam nickel substrate, and which then was characterized by FESEM-EDS, XPS and Raman spectroscopy. The capacitance characteristics and Pb²⁺ adsorption behavior of the composite electrode were evaluated by cyclic voltammetry and capacitance adsorption desorption tests. The results show that the NF/PDMA/MnO₂-Co composite electrode prepared by applied current density of 1 mA/cm² at 30 ℃ for 3min has a higher adsorption capacity (59.9 mg/g) and specific capacitance (208.8 F/g) for the simulated wastewater of 20 mg/L Pb²⁺. The synergistic effect of the bottom layer of PDMA and the top layer of Co doped MnO₂ can effectively improve the capacitance and adsorption performance of the MnO₂ electrode. The adsorption kinetics fitting shows that the adsorption process is controlled by the mixture of physical and chemical adsorption, and is limited by the mass transfer of ions and the diffusion in pores. The stability of the electrode is higher, and its adsorption capacity is 51.7 mg/g after four cycles of adsorption.

Key words： surface and interface in the materials MnO₂ electrode electrodeposition Pb²⁺ capacitive deionization

收稿日期: 2020-05-28

ZTFLH:

TQ174

基金资助:国家自然科学基金(51874227);陕西省自然科学基金(2018JM5131)

作者简介: 唐长斌，男，1973年生，副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.193 或 https://www.cjmr.org/CN/Y2021/V35/I2/115

图1 吸附实验图示

图2 PDMA-3 min电极和MnO2-Co-3min电极的表面形貌

图3 NF/PDMA/MnO2-Co电极的形貌

图4 PDMA聚合膜的XPS谱

图5 NF/PDMA/MnO2-Co电极表面的XPS谱

图6 PDMA底层和NF/PDMA/MnO2-Co电极表面的Raman谱

图7 沉积时间不同的PDMA和MnO2-Co涂层的CV 测试结果

图8 电极的CV曲线

图9 三种电极对Pb2+的电吸附行为

图10 Pb2+吸附的动力学拟合

表1 准一级和准二级动力学拟合Pb2+吸附参数

表2 三种电极吸附Pb2+的Elovich动力学参数

表3 三种电极Pb2+吸附的Weber-Morris参数

图11 三种电极的循环稳定性

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