Efficient photocatalytic degradation of methylene blue by using GO/hemin/TiO2 nanocomposite under visible irradiation

Hongming Shang; Liang Chen; Yujie Wang; Hanyu Liu

Efficient photocatalytic degradation of methylene blue by using GO/hemin/TiO₂ nanocomposite under visible irradiation

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Author(s): Hongming Shang¹ ; Liang Chen² ; Yujie Wang³ ; Hanyu Liu³
- Affiliations: 1: Brookline High School , Brookline, MA 02446 , USA ;
  2: Material Science and Engineering , Northeastern University , Shenyang 110004 , People's Republic of China ;
  3: School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072 , People's Republic of China
Source: Volume 13, Issue 5, May 2018, p. 646 – 651
DOI: 10.1049/mnl.2017.0654 , Online ISSN 1750-0443

Received 03/09/2017, Accepted 18/01/2018, Revised 11/01/2018, Published 01/05/2018

A hybrid photocatalyst with high photocatalytic activity under visible light was developed. The photocatalyst – graphene oxide (GO)/hemin/titanium dioxide (TiO₂) nanocomposite was prepared by a simple method via adsorption at room temperature within 3 h, and was characterised using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV–Vis spectroscopy. The results show that TiO₂ nanoparticles were dispersed on the surface of GO sheets uniformly, and the crystal structure remained the same as original anatase TiO₂ phase in the presence of GO and hemin. Extended absorption of the nanocomposite into the visible region is benefit for the novel hybrid photocatalyst to utilise visible light more efficiently in the photocatalytic reaction. The photocatalytic activity increased about 70% in the presence of GO and hemin (96%) comparing to pure TiO₂ (26%). The nanocomposite catalyst could stably adsorb and degrade methylene blue of different concentration without H₂O₂ or sacrificial electron donor at a relatively wide range of pH values within 3 h. As well as, the prepared GO/hemin/TiO₂ nanocomposite shows good stability and reusability in the photocatalytic reaction, enabling it a potential application in wastewater treatment.

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Efficient photocatalytic degradation of methylene blue by using GO/hemin/TiO₂ nanocomposite under visible irradiation

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