Adsorption of methylene blue by waste graphite synthesized graphene aerogel

doi:10.11894/iwt.2019-1133

Industrial Water Treatment ›› 2020, Vol. 40 ›› Issue (10): 99-102, 115. doi: 10.11894/iwt.2019-1133

• Research and Experiment • Previous Articles Next Articles

Adsorption of methylene blue by waste graphite synthesized graphene aerogel

Ying Zheng^1,²(),Xiaoyu Zhou¹,Hai Ling¹,Hanlu Luo¹,Wenting Mo^1,*(),Jiaheng Lei²,Junsheng Li²

1. College of Urban Construction, Wuchang Shouyi University, Wuhan 430064, China
2. School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China

Received:2020-07-09 Online:2020-10-20 Published:2020-10-21
Contact: Wenting Mo E-mail:hustwb_ying@126.com;7732743@qq.com

废石墨制备石墨烯气凝胶对亚甲基蓝的吸附

郑莹^1,²(),周小雨¹,凌海¹,罗涵璐¹,莫文婷^1,*(),雷家珩²,李俊升²

1. 武昌首义学院城市建设学院, 湖北武汉 430064
2. 武汉理工大学化学化工与生命科学学院, 湖北武汉 430070

通讯作者: 莫文婷 E-mail:hustwb_ying@126.com;7732743@qq.com
作者简介:郑莹(1982-),硕士,副教授。电话:18995638159, E-mail:hustwb_ying@126.com

Abstract

Abstract:

The graphene aerogel was prepared by anode graphite obtained from waste lithium cobalt oxide batteries. The adsorption effect and adsorption mechanism of graphene aerogel on methylene blue was studied. The results showed that the prepared graphene aerogel had a large number of pores and soft sheet structure. Under the conditions of adsorbent dosage 2.5 g/L, initial methylene blue concentration 50 mg/L, pH 8, temperature 30℃ and adsorption time 20 min, the adsorption efficiency was up to 98.6%. The isothermal adsorption conformed to the Langmuir model and its maximum adsorption capacity was 41.39 mg/g. The adsorption reaction kinetics could be fitted by pseudo-secondorder kinetic equation. The adsorption process contained chemical and physical adsorption.

Key words: waste graphite, graphene aerogel, methylene blue, adsorption

摘要：

以废旧钴酸锂电池负极石墨为原料制备石墨烯气凝胶，研究了其对亚甲基蓝的吸附效果和吸附机理。结果表明，制备的石墨烯气凝胶具有大量的孔隙和柔软片层结构。当吸附剂投加量为2.5 g/L，亚甲基蓝初始质量浓度为50 mg/L，pH为8，温度为30℃时，20 min即达到吸附平衡，吸附率为98.6%。该吸附剂对亚甲基蓝的吸附符合Langmiur模型，最大吸附量为41.39 mg/g；吸附反应动力学符合准二级动力学方程。吸附过程包含化学吸附和物理吸附。

关键词: 废石墨, 石墨烯气凝胶, 亚甲基蓝, 吸附

CLC Number:

X703

Ying Zheng,Xiaoyu Zhou,Hai Ling,Hanlu Luo,Wenting Mo,Jiaheng Lei,Junsheng Li. Adsorption of methylene blue by waste graphite synthesized graphene aerogel[J]. Industrial Water Treatment, 2020, 40(10): 99-102, 115.

郑莹,周小雨,凌海,罗涵璐,莫文婷,雷家珩,李俊升. 废石墨制备石墨烯气凝胶对亚甲基蓝的吸附[J]. 工业水处理, 2020, 40(10): 99-102, 115.

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URL: https://www.iwt.cn/EN/10.11894/iwt.2019-1133

https://www.iwt.cn/EN/Y2020/V40/I10/99

Figures/Tables 6

References 11

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变量	Langmuir模型			Freundlich模型
变量	q_max/（mg·g^-1）	K_L/（L·mg^-1）	R²	1/n	K_F	R²
石墨烯气凝胶投加量	15.37	0.029	0.972 5	0.915	1 511	0.973 1
初始亚甲基蓝浓度	41.39	5.539	0.999 7	0.393	11.40	0.861 8
初始pH	18.58	18.819	0.999 7	0.031	19.57	0.934 7
温度	18.97	32.143	0.999 9	0.025	19.57	0.971 8
吸附时间	17.32	7.668	0.998 9	0.059	19.61	0.891 1

变量	Langmuir模型			Freundlich模型
变量	q_max/（mg·g^-1）	K_L/（L·mg^-1）	R²	1/n	K_F	R²
石墨烯气凝胶投加量	15.37	0.029	0.972 5	0.915	1 511	0.973 1
初始亚甲基蓝浓度	41.39	5.539	0.999 7	0.393	11.40	0.861 8
初始pH	18.58	18.819	0.999 7	0.031	19.57	0.934 7
温度	18.97	32.143	0.999 9	0.025	19.57	0.971 8
吸附时间	17.32	7.668	0.998 9	0.059	19.61	0.891 1

温度T/K	准一级动力学方程			准二级动力学方程
温度T/K	q_e/（mg·g^-1）	k₁/min-1	R²	q_e/（mg·g^-1）	k₂/（g·mg^-1·min^-1）	R²
293.15	0.99	0.053 5	0.911 4	19.95	0.176 1	0.999 9
298.15	0.81	0.046 7	0.927 6	20.00	0.128 3	0.999 9
303.15	0.98	0.054 1	0.902 0	19.97	0.161 5	0.999 9
308.15	0.67	0.045 2	0.879 4	19.97	0.153 1	0.999 9
313.15	0.82	0.051 3	0.915 1	19.60	0.132 1	0.999 9

温度T/K	准一级动力学方程			准二级动力学方程
温度T/K	q_e/（mg·g^-1）	k₁/min-1	R²	q_e/（mg·g^-1）	k₂/（g·mg^-1·min^-1）	R²
293.15	0.99	0.053 5	0.911 4	19.95	0.176 1	0.999 9
298.15	0.81	0.046 7	0.927 6	20.00	0.128 3	0.999 9
303.15	0.98	0.054 1	0.902 0	19.97	0.161 5	0.999 9
308.15	0.67	0.045 2	0.879 4	19.97	0.153 1	0.999 9
313.15	0.82	0.051 3	0.915 1	19.60	0.132 1	0.999 9

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