Polydopamine interface encapsulating graphene and immobilizing ultra-small, active Fe3O4 nanoparticles for organic dye adsorption

doi:10.1016/j.ceramint.2020.09.160

	Polydopamine interface encapsulating graphene and immobilizing ultra-small, active Fe3O4 nanoparticles for organic dye adsorption
	Wang, Xiaowen 1; Zhang, Yuyuan 1; Shan, Rui 2; Hu, Huawen 1
刊名	CERAMICS INTERNATIONAL
	2021-02-01
卷号	47 期号:3 页码:3219-3231
关键词	Graphene Polydopamine Fe3O4 nanoparticles Low-coordinated sites Adsorption performance Interactions
ISSN号	0272-8842
DOI	10.1016/j.ceramint.2020.09.160
通讯作者	Hu, Huawen(huawenhu@126.com)
英文摘要	In this study, a combined process of bio-inspired modification and magnetic treatment is presented for the preparation of a polydopamine (Pdop)-modified graphene (Pdop-G)-based adsorbent which incorporates ultra small, active Fe3O4 nanoparticles (with an average size of 6.5 nm). Not only can the nanoparticles impart superparamagnetism to the modified graphene adsorbent but also enhance the adsorption performance. The ultra-small size of Fe3O4 nanoparticles allows the exposure of a high proportion of low-coordinated sites such as corners and edges. Additional active sites can thus be provided to bind methylene blue molecules, in addition to the active Pdop-G surface with catechol and amine groups which induce hydrogen bonding, electrostatic attraction, and x-x stacking interactions. The Pdop interface wraps graphene and immobilizes Fe3O4, endowing the magnetic Pdop-G (MPG) with high adsorption capacity, easy recyclability, and excellent reusability for the organic pollutant removal. In stark contrast, the counterpart without the interfacial Pdop layer suffers from severe Fe3O4 aggregation, causing its adsorption performance inferior to that of MPG. The MPG-based adsorption obeys the pseudo-second-order kinetics, and the intraparticle diffusion model also indicates the complex adsorption pathway, including the external and intraparticle mass transfer. The Langmuir isotherm can better fit the experimental data than the Freundlich isotherm, with the theoretical maximum adsorption capacities estimated to be 131.6, 140.3, and 152.0 mg/g at 30, 40, and 50 degrees C, respectively. The adsorption is endothermic and spontaneous, along with an increase in the randomness at the solid-solution interface. The separation factor (RL) reveals the favorable adsorption process with MPG. The superparamagnetism imparted via the Fe3O4 composition makes MPG easily recyclable. Furthermore, the removal rate can be maintained at about 90% after 5 runs of repeated usage of MPG. This study opens up a new avenue to the magnetization of adsorbents for enhancing adsorption performance in addition to imparting magnetism.
资助项目	National Natural Science Foundation of China[51702050]
WOS关键词	METHYLENE-BLUE DYE ; AQUEOUS-SOLUTION ; EFFICIENT REMOVAL ; OXIDE ; ADSORBENT ; WATER ; REDUCTION ; COMPOSITE ; FUNCTIONALIZATION ; NANOCOMPOSITES
WOS研究方向	Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000602948500004
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/32495]
专题	中国科学院广州能源研究所
通讯作者	Hu, Huawen
作者单位	1.Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Guangdong, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xiaowen,Zhang, Yuyuan,Shan, Rui,et al. Polydopamine interface encapsulating graphene and immobilizing ultra-small, active Fe3O4 nanoparticles for organic dye adsorption[J]. CERAMICS INTERNATIONAL,2021,47(3):3219-3231.
APA	Wang, Xiaowen,Zhang, Yuyuan,Shan, Rui,&Hu, Huawen.(2021).Polydopamine interface encapsulating graphene and immobilizing ultra-small, active Fe3O4 nanoparticles for organic dye adsorption.CERAMICS INTERNATIONAL,47(3),3219-3231.
MLA	Wang, Xiaowen,et al."Polydopamine interface encapsulating graphene and immobilizing ultra-small, active Fe3O4 nanoparticles for organic dye adsorption".CERAMICS INTERNATIONAL 47.3(2021):3219-3231.