Dye adsorption and bactericidal properties of TiO2/chitosan coating layer

Published Date

5 September 2016, Vol.148:153–160, doi:10.1016/j.carbpol.2016.04.042

Title 

Dye adsorption and bactericidal properties of TiO₂/chitosan coating layer

• Author 

• Tahseen Kamal ^a,b,,,
• Yasir Anwar ^c
• Sher Bahadar Khan ^a,b
• Muhammad Tariq Saeed Chani^a,b
• Abdullah M. Asiri ^a,b

• aDepartment of Chemistry, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
• bCenter of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
• cDepartment of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia

Received 5 January 2016. Revised 22 March 2016. Accepted 9 April 2016. Available online 11 April 2016.

Highlights

• •
  TiO₂/chitosan coating layer was used for thymol violet dye removal from water.
• •
  The adsorption capacity of TiO₂/chitosan coated cellulose microfibers was 97.51 mg g-1.
• •
  Efficient antibacterial performance by composite coated cellulose against E. coli.

Abstract

A new kind of titanium oxide dispersed in chitosan (TiO₂/CS) nanocomposite adsorbent was prepared and adhered to high surface area substrate, cellulose microfibers mat (CMM). CS-CMM and TiO₂/CS-CMM were used for the thymol violet (TV) dye removal from wastewater. Characterization of materials was carried out by X-ray diffraction, scanning electron microscope and energy dispersive X-ray spectroscopy. The adsorption properties of both the CS-CMM and TiO₂/CS-CMM were investigated as a function of adsorbent dosage, solution pH, and contact time. It was revealed that the composites pretreated in the solution with higher pH value exhibited larger adsorption capacities. Kinetic studies showed that the composites could adsorb TV dye rapidly and reached the equilibrium in 90 min. The adsorption process followed pseudo-second order kinetics and involved particle diffusion mechanism. The calculated maximum adsorption capacities of CS-CMM and TiO₂/CS-CMM were 84.32 and 97.51 mg g⁻¹, respectively. Compare to CS, the TiO₂/CS nanocomposite coated CMM showed higher antibacterial characteristics as tested against Escherichia coli.

Keywords

• Adsorption
• Nanocomposite
• TiO₂
• Chitosan
• Coating layer

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• ⁎ 
  Corresponding author at: Department of Chemistry, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.

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