Photocatalytic properties of TiO2-SiO2-coated concrete on toluene gas

Valmiki B. Koli, Shielah Mavengere, Jung Sik Kim

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Air pollution is a major problem in today's modern society. Specifically, volatile organic compounds (VOCs) are one of the main air pollutants in the environment. In the present work, an attempt is made to remove VOCs in the environment by coating TiO2 on concrete samples using a simple spray coating. The anatase phase of TiO2 coated samples was confirmed by XRD analysis. The optical absorbance of the coated sample was investigated using UV-vis DRS, and the morphology was investigated using FE-SEM analysis. In addition, the elemental composition was determined by EDS, and chemical bond formation between SiO2-TiO2 as well presence various function moieties confirmed by FTIR analysis. Photocatalytic activity was examined by degradation of toluene gas under UV light. Photodegradation results confirm that the first layer of SiO2 coated on the concrete sample enhanced the photocatalytic efficiency of TiO2. Stability of sample confirmed through recyclability test. Overall, the experimental results suggest that TiO2-SiO2 coated concrete samples are an efficient photocatalytic surface for removal of VOCs in the environment.

Original languageEnglish
Article number125006
JournalMaterials Research Express
Issue number12
StatePublished - Dec 2018


  • TiO-SiO coated concrete
  • photodegradation
  • reactive oxygen species (ROS)
  • volatile organic compounds


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