Adsorption of carbon dots onto Al2O3 in aqueous: Experimental and theoretical studies. (August 2017)

• Record Type: Journal Article
• Authors: Liu, Xia; Li, Jiaxing; Wu, Xiaohua; Zeng, Zhi; Wang, Xianlong; Hayat, Tasawar; Zhang, Xiaodong
• Is Part Of: Environmental pollution. Volume 227(2017)
• Page Start: 31
• Page End: 38
• Publication Date: 2017-08
• Subjects: Carbon dots -- Al2O3 -- Adsorption -- Electrostatic interactions; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2017.04.041
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Increasing interests in carbon dots (CDs) research resulted in the increased production of CDs and the risk to be released into the environment, including surface water and groundwater. To assess the environmental behavior of CDs, the stability of CDs in aqueous solutions were first examined by different environmental conditions, followed by the systematic investigation of the adsorption behaviors of CDs onto Al2 O3 surface. Electrostatic interactions were considered as the dominant forces in CDs adsorption onto Al2 O3 process, which were further confirmed by controlling experiments as compared with other minerals or oxides, such as montmorillonite, kaolinite and SiO2 . Theoretical calculations and characterization of Al2 O3 /CDs revealed chemisorptions exist in the adsorption process. Our investigation results provided fundamental understanding towards the interaction of CDs with Al2 O3 surface, and potential fate of CDs under natural conditions in aquatic environment, as well as in soils and sediments. Graphical abstract: Highlights: The stability of CDs in aqueous solution was investigated on various conditions. The adsorption of CDs onto Al2 O3 surface was investigated by batch experiment. The adsorption mechanism was studied by density functional theory.