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Adsorption of rare earth ions using carbonized polydopamine nano carbon shells

Journal of Rare Earths 2016年第1期34卷 77-82页

作者：孙晓琦 LUO Huimin Shannon M.Mahurin LIU Rui HOU Xisen DAI Sheng Chemical Sciences Division Oak Ridge National Laboratory Xiamen Institute of Rare Earth Materials Haixi Institute Chinese Academy of Sciences Energy and Transportation Science Division Oak Ridge National Laboratory Department of Chemistry University of Tennessee

Herein we reported the structure effects of carbon nano-shells prepared by the carbonization of polydopamine for the ad- sorption of rare earth elements （REEs） for the first time. Solid carbon spheres, 60 nm carbon shells and 500 nm carbon shells were prepared and evaluated for adsorption and desorption of REEs. The adsorption performance of carbon nano-shells for REEs was far superior to the solid carbon spheres. In addition, the effect of acidity on the adsorption and desorption properties was discussed. The good adsorption performance of the carbon nano-shells could be attributed to their pore structure, specific surface area, and the pres- ence of both amine and carbonyl groups from the grafted dopamine.

关键词： carbon shells rare earths adsorption separation

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Fe-N co-doped coral-like hollow carbon shell toward boosting peroxymonosulfate activation for efficient degradation of tetracycline: Singlet oxygen-dominated non-radical pathway

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Journal of Environmental Sciences 2023年第4期126卷 470-482页

作者： Wenjin Chen Jin Huang Yaqian Shen Ke Zhu Lele Lei Hongmei He Yushi Ai School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China

Fe-N co-doped coral-like hollow carbon shell (Fe-N-CS) was synthesized via a simply impregnation-pyrolysis method.The Fe-N-CS showed an excellent ability for activating peroxymonosulfate (PMS),which could degrade about 93.74%tetracycline (20 mg/L) in 12 min.The Fe-N-CS/PMS system exhibited a good anti-interference capacity of various pH,inorganic anions,HA and different water qualities.More importantly,the Fe nanoparticles were anchored uniformly in the carbon layer,effectively limiting the metal leaching.The quenching tests and electron spin resonance (ESR) manifested that non-radical singlet oxygen (1O_(2))was the main reactive oxygen species (ROS) for TC degradation.The mechanism study showed that Fe nanoparticles,defect and graphite N played a key role in activating PMS to produce ROS.Moreover,three probable degradation pathways were proposed by using LC-MS measurements.Generally,this work had a new insight for the synthesis of heterogeneous Fe-N-C catalysts in the advanced oxidation process based on PMS.

关键词： Fe-N co-doped carbon shells Peroxymonosulfate Tetracycline Singlet oxygen

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