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The preparation and characterization of CaMg(CO3)2@Ag2CO3/Ag2S/NCQD nanocomposites and their photocatalytic performance in phenol degradation

  • Jian Tian
  • Zhen Liu
  • Debin Zeng
  • Changlin Yu
  • Xingqiang Liu
  • Kai Yang
  • Hong Liu
Research Paper

Abstract

Using CaMg(CO3)2 as hard template, CaMg(CO3)2@Ag2CO3 microspheres were first obtained via a fast cation exchange process. Then, CaMg(CO3)2@Ag2CO3/Ag2S was fabricated by further anion exchange. Finally, trace nitrogen-doped carbon quantum dots (NCQDs) were coupled into CaMg(CO3)2@Ag2CO3/Ag2S and obtained CaMg (CO3)2@Ag2CO3/Ag2S/NCQD nanocomposites (< 380 nm). Different characterization techniques, e.g., XRD, N2 physical adsorption, SEM, TEM, UV-vis, FT-IR, X-ray photoelectron spectroscopy, TPR, photoluminescence, and electrochemical impedance spectroscopy test, were applied to investigate the physicochemical property of the as-prepared samples. The photocatalytic properties were evaluated by phenol degradation under simulated sunlight illumination. The results demonstrated that with a very low content of Ag2CO3 (0.67 wt%) and Ag2S (1.72 wt%) and a trace of NCQDs (0.46 at.%), the CaMg(CO3)2@Ag2CO3/Ag2S/NCQD nanocomposites exhibited excellent activity and stability for phenol degradation. The reasons for the enhancement of photocatalytic activity and stability are due to that the coexistence of trace Ag2S and NCQDs can effectively improve the texture property of photocatalyst and effectively promote the separation of photogenerated electrons and holes, resulting in more radicals (h+ and·O2) to destroy the phenol. This work provided a new method to develop low-cost Ag-based semiconductor photocatalysts for environmental remediation.

Keywords

CaMg(CO3)2 Ag2Ag2CO3 Nitrogen-doped carbon quantum dots Phenol degradation Nanostructured catalysts 

Notes

Funding information

This research work was financially supported by the National Natural Science Foundation of China (21567008, 21607064, 21707055); the Program of 5511 Talents in Scientific and Technological Innovation of Jiangxi Province (20165BCB18014); the Academic and Technical Leaders of the Main Disciplines in Jiangxi Province (20172BCB22018); the Program of Qingjiang Excellent Young Talents, Jiangxi University of Science and Technology, Jiangxi Province Natural Science Foundation (20161BAB203090); the Natural Science Foundation of Fujian Province of China (No. 2015 J01062); and the Program for New Century Excellent Talents in Fujian Province University.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.School of Metallurgy and Chemical EngineeringJiangxi University of Science and TechnologyGanzhouChina
  2. 2.Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and EngineeringGuangzhou UniversityGuangzhouChina
  3. 3.Department of Environmental Science and EngineeringTan Kah Kee College Xiamen UniversityZhangzhouChina

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