Description:
A B S T R A C T
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 217.8m2·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.