Adsorption-degradation synergetic effects on removal of methylene blue over heterostructured TiO2/Co4S4.23Se 3.77 composites

Jian Yu, Wan Feng Lin, Le Hui Leng, Shao Kui Bao, Jian Ping Zou*, Xu Biao Luo, De Zhi Chen, Sheng Lian Luo, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

14 Citations (Scopus)


Novel heterostructured TiO2/Co4S 4.23Se3.77 composites were synthesized by a combination of solid-state and sol-gel methods, and were characterized by single-crystal X-ray diffraction, powder X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, and photocurrent measurements. The results of photocatalytic degradation of methylene blue over the as-prepared materials indicate that photocatalytic efficiency is closely related to the composition of the materials, and the 30%TiO2/Co4S4.23Se3.77 catalyst exhibits the best adsorption and photodegradation efficiency under sunlight or visible-light irradiation. The adsorption capacity of 30%TiO2/Co 4S4.23Se3.77 for methylene blue is 18.59 mg/g calculated based on the Langmuir adsorption model. Adsorption kinetics studies show that the process fits well with a pseudo-second-order rate mechanism. Recycle experiments confirm that the 30%TiO2/Co4S 4.23Se3.77 catalyst is stable. The present work illustrates a new way for the design and syntheses of stable and high-efficiency catalysts applicable for the degradation of organic pollutants.

Original languageEnglish
Pages (from-to)121-128
Number of pages8
JournalJournal of Molecular Catalysis A: Chemical
Publication statusPublished - 15 Nov 2014

Scopus Subject Areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

User-Defined Keywords

  • Adsorption-degradation
  • Heterostructured
  • Photocatalysis
  • Solid solution
  • Synthetic methods


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