Fabrication of Ag 2 O/TiO 2 composites on nanographene platelets for the removal of organic pollutants: Influence of oxidants and inorganic anions

Rosari Saleh, Ardiansyah Taufik, Suhendro Purbo Prakoso

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Ternary Ag 2 O/TiO 2 /nanographene platelet (Ag 2 O/TiO 2 /NGP) composites containing various amounts of NGP were synthesized using a microwave-assisted method and were used as catalysts for degradation of organic dyes in aqueous solution. The composites were characterized by various methods, and their photocatalytic performance was systematically investigated with respect to degradation of methylene blue. Compared with pure TiO 2 and Ag 2 O nanoparticles as well as Ag 2 O/TiO 2 composites, the Ag 2 O/TiO 2 /NGP composites exhibited superior photocatalytic performance in the UV and visible light range. The results also indicated that Ag 2 O/TiO 2 /NGP composites could be used as efficient broad-spectrum catalysts for the removal of several dye contaminants in aqueous solutions. The correlation between photocatalytic mechanism and physical properties of the catalysts was discussed. The effects of the addition of hydrogen peroxide (H 2 O 2 ) and persulfate on MB degradation were also investigated. Photocatalytic efficiency was noticeable in the presence of both oxidizers. Because inorganic anions are common substances in natural water, their influence was also evaluated. They were found to inhibit the catalytic activity of Ag 2 O/TiO 2 /NGP composites. Their effectiveness in inhibiting photocatalytic degradation of MB was CO 3 2− > NO 3 > HPO 4 > Cl > SO 4 2− .

Original languageEnglish
Pages (from-to)697-708
Number of pages12
JournalApplied Surface Science
Volume480
DOIs
Publication statusPublished - 30 Jun 2019

Keywords

  • Composites
  • Methylene blue
  • Nanographene platelet
  • Photocatalytic degradation
  • Waste purification

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