Degradation of methyl orange and congo red by using chitosan/polyvinyl alcohol/TiO2 electrospun nanofibrous membrane

Umma Habiba; Jacky Jia Li Lee; Tan Chin Joo; Bee Chin Ang; Amalina M Afifi

doi:10.1016/j.ijbiomac.2019.03.132

Degradation of methyl orange and congo red by using chitosan/polyvinyl alcohol/TiO₂ electrospun nanofibrous membrane

Int J Biol Macromol. 2019 Jun 15:131:821-827. doi: 10.1016/j.ijbiomac.2019.03.132. Epub 2019 Mar 20.

Authors

Umma Habiba¹, Jacky Jia Li Lee¹, Tan Chin Joo¹, Bee Chin Ang², Amalina M Afifi³

Affiliations

¹ Center of Advanced Material, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.
² Center of Advanced Material, Department of Chemical engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.
³ Center of Advanced Material, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.. Electronic address: amalina@um.edu.my.

PMID: 30904531
DOI: 10.1016/j.ijbiomac.2019.03.132

Abstract

In this study, chitosan/polyvinyl alcohol/TiO₂ nanofiber was fabricated via electrospinning at a pump rate of 1.5 mL/h and voltage 6 kV. Field-emission scanning electron microscopic images showed bead free finer nanofiber. Fourier transform infrared spectra proved the formation of strong bond among chitosan, polyvinyl alcohol and TiO₂. X-ray powder diffraction showed that TiO₂ became amorphous in the composite nanofiber. Toughness and thermal stability of the chitosan/PVA nanofibrous membrane was increased with addition TiO₂. The chitosan/PVA/TiO₂ nanofibrous membrane was stable at basic medium. But degraded in acidic and water medium after 93 and 162 h, respectively. The adsorption mechanism of congo red obeyed the Langmuir isotherm model. On the other hand, adsorption characteristic of methyl orange fitted well with both Langmuir and Freundlich isotherm models. The maximum adsorption capacity of the resulting membrane for congo red and methyl orange is 131 and 314 mg/g, respectively. However, a high dose of adsorbent was required for congo red.

Keywords: Chitosan; Electrospinning; TiO(2).

MeSH terms

Adsorption
Azo Compounds / chemistry*
Chitosan / chemistry*
Congo Red / chemistry*
Membranes, Artificial
Nanofibers / chemistry*
Nanofibers / ultrastructure
Polyvinyl Alcohol / chemistry*
Spectrum Analysis
Tensile Strength
Thermodynamics
Titanium / chemistry*
Water Pollutants, Chemical / chemistry
Water Purification

Substances

Azo Compounds
Membranes, Artificial
Water Pollutants, Chemical
titanium dioxide
Congo Red
methyl orange
Polyvinyl Alcohol
Chitosan
Titanium