Research on the electrosorption removal of low concentration cadmium ions by graphene based materials

doi:10.11894/iwt.2019-0989

Industrial Water Treatment ›› 2020, Vol. 40 ›› Issue (10): 34-38. doi: 10.11894/iwt.2019-0989

• Research and Experiment • Previous Articles Next Articles

Research on the electrosorption removal of low concentration cadmium ions by graphene based materials

Bin Xu¹(),Xiaofei Zhang¹,Fei He¹,Hailing Gao¹,Ranran Wang²,Wenqian Wu¹,Wenzhong Yang²,Yimin Zhang^1,*()

1. Nanjing Institute of Environmental Science, Ministry of Ecology and Environmental of the People's Republic of China, Nanjing 210042, China
2. College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210037, China

Received:2020-06-11 Online:2020-10-20 Published:2020-10-21
Contact: Yimin Zhang E-mail:xubinnies@163.com;zymnies@163.com

石墨烯基材料对低浓度镉离子的电吸附研究

徐斌¹(),张孝飞¹,何斐¹,皋海岭¹,王冉冉²,吴文倩¹,杨文忠²,张毅敏^1,*()

1. 生态环境部南京环境科学研究所, 江苏南京 210042
2. 南京工业大学化学与分子工程学院, 江苏南京 210037

通讯作者: 张毅敏 E-mail:xubinnies@163.com;zymnies@163.com
作者简介:徐斌(1988-),博士,助理研究员。电话:13952048509, E-mail:xubinnies@163.com
基金资助:
江苏省自然科学基金青年科学基金资助项目(BK20170111);国家自然科学基金青年科学基金资助项目(51808251);水体污染控制与治理科技重大专项项目(2017ZX07203-004);江苏省科协青年科技人才托举工程项目

Abstract

Abstract:

The graphene based materials(RGO/TiO₂) modified by titanium dioxide was prepared by hydrothermal synthesis method and assembled into CDI electrode. The removal effect of low concentration Cd²⁺ by electrosorption was investigated and compared with that of RGO electrode. The results showed that the adsorption capacity of Cd²⁺ of the two electrodes increased with the increase in working voltage and initial concentration of Cd²⁺, but decreased with the increase in temperature. The effect of circulating flow rate on the adsorption of Cd²⁺ was not obvious. In addition, the CDI removal performance of Cd²⁺ for RGO/TiO₂ electrode was better than that for RGO electrode. The electrosorption process met the pseudo-first order kinetic model and Freundlich model.

Key words: capacitance deionization, graphene, water treatment, cadmium ion

摘要：

采用水热合成法制备了二氧化钛改性的石墨烯基材料（RGO/TiO₂），将其组装成CDI电极，探究了电吸附去除低浓度Cd²⁺的效果，并与RGO电极进行了比较。结果表明，2种电极对Cd²⁺的电吸附量随工作电压的升高、Cd²⁺初始浓度的增大而增大，随温度的升高而减小；循环流速对Cd²⁺的吸附效果影响不明显。RGO/TiO₂电极CDI除Cd²⁺性能优于RGO电极，电吸附过程满足准一级动力学方程和Freundlich等温吸附模型。

关键词: 电容去离子, 石墨烯, 水处理, Cd²⁺

CLC Number:

X703

Bin Xu,Xiaofei Zhang,Fei He,Hailing Gao,Ranran Wang,Wenqian Wu,Wenzhong Yang,Yimin Zhang. Research on the electrosorption removal of low concentration cadmium ions by graphene based materials[J]. Industrial Water Treatment, 2020, 40(10): 34-38.

徐斌,张孝飞,何斐,皋海岭,王冉冉,吴文倩,杨文忠,张毅敏. 石墨烯基材料对低浓度镉离子的电吸附研究[J]. 工业水处理, 2020, 40(10): 34-38.

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URL: https://www.iwt.cn/EN/10.11894/iwt.2019-0989

https://www.iwt.cn/EN/Y2020/V40/I10/34

Figures/Tables 11

References 13

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	参数	1.0 V	1.2 V	1.4 V	1.6 V
准一级动力学	q_e/（mg·g^-1）	0.009 31	0.017 42	0.018 7	0.020 3
	K₁/min^-1	4.43×10^-2	2.58×10^-2	2.68×10^-2	2.58×10^-2
	R²	0.990	0.996	0.996	0.997
准二级动力学	q_e/（mg·g^-1）	0.012 8	0.027 0	0.029 2	0.030 7
	K₂/（g·mg^-1·min^-1）	2.733	0.637	0.608	0.595
	R²	0.942	0.963	0.957	0.979

	参数	1.0 V	1.2 V	1.4 V	1.6 V
准一级动力学	q_e/（mg·g^-1）	0.009 31	0.017 42	0.018 7	0.020 3
	K₁/min^-1	4.43×10^-2	2.58×10^-2	2.68×10^-2	2.58×10^-2
	R²	0.990	0.996	0.996	0.997
准二级动力学	q_e/（mg·g^-1）	0.012 8	0.027 0	0.029 2	0.030 7
	K₂/（g·mg^-1·min^-1）	2.733	0.637	0.608	0.595
	R²	0.942	0.963	0.957	0.979

	参数	1.0 V	1.2 V	1.4 V	1.6 V
准一级动力学	q_e/（mg·g^-1）	0.017 5	0.021 4	0.027 9	0.030 1
	K₁/min^-1	5.62×10^-2	4.72×10^-2	3.52×10^-2	3.81×10^-2
	R²	0.995	0.994	0.992	0.995
准二级动力学	q_e/（mg·g^-1）	0.021 5	0.027 4	0.037 5	0.040 2
	K₂/（g·mg^-1·min^-1）	2.859	1.705	0.838	0.845
	R²	0.995	0.995	0.978	0.989

	参数	1.0 V	1.2 V	1.4 V	1.6 V
准一级动力学	q_e/（mg·g^-1）	0.017 5	0.021 4	0.027 9	0.030 1
	K₁/min^-1	5.62×10^-2	4.72×10^-2	3.52×10^-2	3.81×10^-2
	R²	0.995	0.994	0.992	0.995
准二级动力学	q_e/（mg·g^-1）	0.021 5	0.027 4	0.037 5	0.040 2
	K₂/（g·mg^-1·min^-1）	2.859	1.705	0.838	0.845
	R²	0.995	0.995	0.978	0.989

电极	Langmuir模型			Freundlich模型
电极	q_m/(mg·g^-1)	K_L/(L·mg^-1	R²	K_F	1/n	R²
RGO	0.051 6	8.003	0.956	0.110	0.682	0.972
RGO/TiO₂	0.054 4	48.115	0.922	0.106	0.358	0.961

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