Synergistic Effects of Organic Ligands and Visible Light on the Reductive Dissolution of CeO2 Nanoparticles: Mechanisms and Implications for the Transformation in Plant Surroundings

Liu，Bei; Han，Zixin; Pan，Yu; Liu，Xun; Zhang，Meng; Wan，Aling; Wang，Zhongying

2023-08-15

10.1021/acs.est.3c03216

Environmental Science and Technology   Impact Factor & Quartile

0013-936X

1520-5851

Cerium oxide (CeO) nanoparticles are one of the most important engineered nanomaterials with demonstrated applications in industry. Although numerous studies have reported the plant uptake of CeO, its fate and transformation pathways and mechanisms in plant-related conditions are still not well understood. This study investigated the stability of CeO in the presence of organic ligands (maleic and citric acid) and light irradiation. For the first time, we found that organic ligands and visible light had a synergistic effect on the reductive dissolution of CeO with up to 30% Ce releases after 3 days, which is the highest release reported so far under environmental conditions. Moreover, the photoinduced dissolution of CeO in the presence of citrate was much higher than that in maleate, which are adsorbed on the surface of CeO through inner-sphere and outer-sphere complexation, respectively. A novel ligand-dependent photodissolution mechanism was proposed and highlighted: upon electron-hole separation under light irradiation, the inner-sphere complexed citrate is more capable of consuming the hole, prolonging the life of electrons for the reduction of Ce(IV) to Ce(III). Finally, reoxidation of Ce(III) by oxygen was observed and discussed. This comprehensive work advances our knowledge of the fate and transformation of CeO in plant surroundings.

complexation engineered nanomaterials organic acid transformation visible light

SCI

English

NI Journal Papers

First ; Corresponding

National Natural Science Foundation of China[22076075];

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:001040351600001

AMER CHEMICAL SOC

ENVIRONMENT/ECOLOGY

2-s2.0-85168222127

Scopus

School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Liu，Bei,Han，Zixin,Pan，Yu,et al. Synergistic Effects of Organic Ligands and Visible Light on the Reductive Dissolution of CeO2 Nanoparticles: Mechanisms and Implications for the Transformation in Plant Surroundings[J]. Environmental Science and Technology,2023,57(32):11999-12009.

Liu，Bei.,Han，Zixin.,Pan，Yu.,Liu，Xun.,Zhang，Meng.,...&Wang，Zhongying.(2023).Synergistic Effects of Organic Ligands and Visible Light on the Reductive Dissolution of CeO2 Nanoparticles: Mechanisms and Implications for the Transformation in Plant Surroundings.Environmental Science and Technology,57(32),11999-12009.

Liu，Bei,et al."Synergistic Effects of Organic Ligands and Visible Light on the Reductive Dissolution of CeO2 Nanoparticles: Mechanisms and Implications for the Transformation in Plant Surroundings".Environmental Science and Technology 57.32(2023):11999-12009.