Novel methods of sewage sludge utilization for photocatalytic degradation of tetracycline-containing wastewater

Xuefeng Zhu, Wenyi Yuan, Maoqian Lang, Guangyin Zhen, Xuedong Zhang, Xueqin Lu

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

Two types of novel municipal sewage sludge (SS) combined TiO 2 photocatalysts (ST 1 and ST 2 ) were synthesized through calcination treatment under different atmospheres (air and N 2 ). The morphology, structure, and chemical states of photocatalysts were characterized by SEM, XRD, EDS, FT-IR, Raman UV–Vis, BET, and TG-IR. The results showed that ST 2 consisted of a mesoporous graphene-like structure (20.02 nm) displayed exhibited better visible light photocatalytic performances and the highest BET surface area and pore volume (92.97 m 2 g −1 and 0.46 cm 3 /g). The doping of Carbon and transition metals (Al, Mg) in TiO 2 strengthened visible-light response by lowering the band gap. The photocatalytic ability is evaluated in the degradation of tetracycline, which is a typical antibiotic in the aquatic environment. The ST 2 photocatalytic efficiency under visible light than that of ST 1 and TiO 2 . The enhancement is formed together by porous surface and lower band gap of ST 2 , which could offer more active sites and facilitate faster electron-hole pair separation. In addition, the sludge-TiO 2 calcination in N 2 (ST 2 ) has the potential to reduce CO 2 emission while recovering more energy from the sludge, which turned out to be a more cost-effective way to reutilization of sewage sludge compared with that of calcination in air.

Original languageEnglish
Pages (from-to)148-156
Number of pages9
JournalFuel
Volume252
DOIs
Publication statusPublished - 2019

Keywords

  • Photocatalytic activity
  • Reutilization
  • Sewage sludge
  • Tetracycline
  • TiO photocatalysts

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