Enhanced visible light photocatalytic activity of alkaline earth metal ions-doped CdSe/rGO photocatalysts synthesized by hydrothermal method

Mingjun Zhou, Donglai Han, Xinlin Liu, Changchang Ma, Huiqin Wang, Yanfeng Tang, Pengwei Huo, Weidong Shi, Yongsheng Yan, Jinghai Yang

Research output: Contribution to journalArticlepeer-review

137 Scopus citations

Abstract

Quantum dots (QDs) CdSe exhibits relatively high photocatalytic abilities for its unique properties, but the aggregation and photocorrosion have blocked its further application. Therefore, for arriving at a solution, alkaline earth metal ions (M=Mg2+, Ca2+, Sr2+ and Ba2+) and reduced graphene oxide (rGO) are chosen to fabricated new QDs CdSe-based photocatalytic systems. In this paper, M@CdSe/rGO composites have been synthesized via a facile one-step hydrothermal approach, during which the formation of M doped CdSe crystallization and GO reduction occur simultaneously. The obtained photocatalysts demonstrates synergistically enhanced visible light photocatalytic activity and stability toward photodegrading tetracycline hydrochloride (TC-HCl) solution, especially the introduction of 6mol% Ca2+ and 5wt% GO on QDs CdSe resulted in 85.6% degradation of 15mg/L TC-HCl in 1h with 0.5g/L catalyst. Furthermore, the photodegradation mechanism was systematically investigated by active species trapping experiment. It revealed that h+ was the major active species in the destructions process. And the possible process of charge transfer for Ca2+@CdSe/rGO nanocomposite was proposed based on the experimental results.

Original languageEnglish
Pages (from-to)174-184
Number of pages11
JournalApplied Catalysis B: Environmental
Volume172-173
DOIs
StatePublished - 1 Aug 2015
Externally publishedYes

Keywords

  • Alkaline earth metal ions
  • Hydrothermal method
  • QDs CdSe
  • Reduced graphene oxide

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