Interactions of CeO2 nanoparticles with natural colloids and electrolytes impact their aggregation kinetics and colloidal stability

Li, Xing1; He, Erkai2; Zhang, Miaoyue2; Peijnenburg, Willie J.G.M.3; Liu, Yang4; Song, Lan5; Cao, Xinde1; Zhao, Ling1; Qiu, Hao1

2020

10.1016/j.jhazmat.2019.121973

Journal of Hazardous Materials   影响因子和分区

18733336

1873-3336

The aggregation kinetics and colloidal stability of CeO2-NPs in the presence of monovalent or divalent electrolytes, as well as inorganic (kaolin and goethite) and organic (humic acid, HA) colloids were evaluated using time-resolved dynamic light scattering, advanced spectroscopic tools, and theoretical calculations. Critical coagulation concentrations for CeO2-NPs were generally lower in CaCl2 than that in NaCl electrolyte. The negatively charged kaolin accelerated CeO2-NPs aggregation due to electrostatic attraction, whilst opposite phenomenon was observed for the positively charged goethite in NaCl solution. In CaCl2 solution, goethite destabilized CeO2-NPs because of its well-crystal structure and specific adsorption of Ca²⁺. The presence of 0.1 mg C/L HA decreased the surface charge of CeO2-NPs, resulting in lower critical coagulation concentrations. Increasing the HA concentration from 0.1 to 1 mg C/L improved CeO2-NPs stability, mainly via electrostatic and steric repulsion. The Ca²⁺-bridging and complexation contributed significantly to CeO2-NPs aggregation. Additional aggregation experiments in seven natural waters revealed that CeO2-NPs remained stable in water types with high contents of organic colloids and low levels of salts, thus having higher transport potential. These findings provided new insights into the interactive influence of naturally occurring colloids and ions on the heteroaggregation behavior and fate of CeO2-NPs.
© 2019 Elsevier B.V.

CeO(2)NPs Kaolin Goethite Humic acid Heteroaggregation

SCI ; EI

英语

其他

[2018YFC1800600] ; [642007] ; National Natural Science Foundation of China[41877500] ; [17Z1170010019]

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:000514748600029

Elsevier B.V.

20195207926174

Agglomeration ; Coagulation ; Crystal structure ; Electrolytes ; Electrostatics ; Kaolin ; Light scattering ; Organic acids ; Sodium chloride ; Sols

Minerals:482.2 ; Electricity: Basic Concepts and Phenomena:701.1 ; Light/Optics:741.1 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Crystal Lattice:933.1.1

ENGINEERING

Web of Science

1.School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China
2.School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou; 510275, China
3.National Institute of Public Health and the Environment, Center for the Safety of Substances and Products, Bilthoven; 3720 BA, Netherlands
4.Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming; 650500, China
5.School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen; 518055, China

Li, Xing,He, Erkai,Zhang, Miaoyue,et al. Interactions of CeO2 nanoparticles with natural colloids and electrolytes impact their aggregation kinetics and colloidal stability[J]. Journal of Hazardous Materials,2020,386.

Li, Xing.,He, Erkai.,Zhang, Miaoyue.,Peijnenburg, Willie J.G.M..,Liu, Yang.,...&Qiu, Hao.(2020).Interactions of CeO2 nanoparticles with natural colloids and electrolytes impact their aggregation kinetics and colloidal stability.Journal of Hazardous Materials,386.

Li, Xing,et al."Interactions of CeO2 nanoparticles with natural colloids and electrolytes impact their aggregation kinetics and colloidal stability".Journal of Hazardous Materials 386(2020).