Rapid thermally processed hierarchical titania-based hollow fibres with tunable physicochemical and photocatalytic properties

Tianlong Zhang, Muthia Elma, Fengwei Xie, Julius Motuzas, Xiwang Zhang, David K. Wang

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

A series of photocatalytic TiO2–carbon composite hollow fibres (HFs) was prepared in this study by a wet-dry phase inversion spinning method followed by a rapid thermal processing (RTP). The RTP method consists of two stages: (1) calcination at 800 °C for 15 min encased in a quartz tube followed by (2) a short open heating exposure at 800 °C for 0 to 7.5 min in air. The innovative two-stage RTP method led to a time saving of more than 90%. Results revealed that the pyrolysis conditions during the second stage of HF fabrication were essential to the final physical and chemical properties of resultant TiO2-carbon HFs, such as TiO2 crystallinity and carbon content, mechanical, textural and electronic properties, as well as photocatalytic reactivity. The best results show that HFs pyrolysed for a short duration (< 2 min) in the second stage produced a high microporous surface area of 217.8 m2·g−1, a good mechanical strength of 11 MPa and a TiO2 anatase-to-rutile (A/R) ratio of 1.534 on the HF surface. The HFs also achieved a 68% degradation of acid orange 7 dye with a kapp of 0.0147 min−1 based on a Langmuir-Hinshelwood model during the photocatalysis under UV light. Thus, this work provides a new synthesis protocol with significant time and cost savings to produce high-quality HFs for wastewater treatment.

Original languageEnglish
Pages (from-to)99-106
Number of pages8
JournalSeparation and Purification Technology
Volume206
DOIs
Publication statusPublished - 29 Nov 2018

Keywords

  • Carbon char
  • Hollow fibre
  • Photocatalysis
  • Rapid thermal processing
  • Titanium dioxide

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