QDs-sized TiO2-x/Bi12O15Cl6/BiOCl photocatalysts with tandem n-n heterojunctions: Facile fabrication and impressive visible-light-induced photocatalytic performances

Jahed-Jaafargolikhanlo M., Habibi-Yangjeh A., Pournemati K., Akınay Y.

Surfaces and Interfaces, vol.41, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 41
  • Publication Date: 2023
  • Doi Number: 10.1016/j.surfin.2023.103215
  • Journal Name: Surfaces and Interfaces
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Photodegradation, Tandem n-n heterojunction, Tetracycline, TiO2-x/Bi12O15Cl6/BiOCl, Visible-light-induced photocatalysis
  • Van Yüzüncü Yıl University Affiliated: Yes


In the present study, we combined brown TiO2 (denoted as TiO2-x) with Bi12O15Cl6 and BiOCl components via a one-pot hydrothermal route preceded by calcination at 500 ○C. The resultant novel photocatalyst was characterized by TEM, SEM, XRD, XPS, EDX, UV–vis DRS, FTIR, Raman, PL, photocurrent density, BET, and EIS analyses. The quantum dots (QDs)-sized TiO2-x/Bi12O15Cl6/BiOCl nanocomposite exhibited a significant photocatalytic ability upon visible light for the photodegradation of tetracycline (TC) with the rate constant of 379 × 10−4 min−1, which was 28.3 and 9.92 times as high as pristine TiO2 and TiO2-x, respectively. Moreover, compared with TiO2, the optimum photocatalyst presented boosted activity of 25.3 and 23.7 times in the degradations of rhodamine B and Fuchsine, and 23.0 folds in the reduction of Cr (IV) to Cr (III). The photoluminescence, electrochemical, and textural analyses showed that the boosted activity of ternary TiO2-x/Bi12O15Cl6/BiOCl photocatalyst is attributed to impressive separation and transfer of the photoinduced charges, and high surface area. The improved charge separation mechanism was devoted to developing tandem n-n heterojunctions amongst TiO2-x, Bi12O15Cl6, and BiOCl counterparts, as well as the construction of a QDs-sized photocatalyst. Moreover, the photocatalyst displayed considerable reusability in the TC degradation reaction. At last, the biocompatibility of the treated solution over the optimum TiO2-x/Bi12O15Cl6/BiOCl nanocomposite was proved by the growth of wheat seeds.