Fresh and Uncalcined Solution Blow Spinning - Spun PAN and PVDF Nanofiber Membranes for Methylene Blue Dye Removal in Water

Document Type : Research Paper

Authors

1 Department of Chemical Engineering, University of San Carlos- Talamban

2 Chemical Engineering Department, Xavier University – Ateneo de Cagayan, Cagayan de Oro City, Philippines

3 Chemical Engineering Department, Xavier University – Ateneo de Cagayan, Corrales Avenue, Cagayan de Oro City, 9000 Philippines

Abstract

Freshly produced and uncalcined solution blow spun-poly (acrylonitrile) (PAN) and poly (vinylidene fluoride) (PVDF) nanofiber (NF) membranes were utilized as adsorptive membranes for methylene blue (MB) dye in water under batch adsorption. The effects of various initial dye solution concentrations (3-15 mg/L) and contact time (1-10 minutes) versus its adsorption capabilities of the nanofiber membranes were studied. Furthermore, adsorption isotherm that best fit the experimental data was determined. The equilibrium adsorption capacity, qe , for both nanofiber membranes increased with MB concentration of 3 - 7 mg/L but qe considerably decreased when such MB amounts increased to 15 mg/L. The highest qe obtained was 50.78 and 34.97 mg/g for PAN NF and PVDF NF membranes, respectively. Both NF membranes also showed high MB adsorption with increased contact time until equilibrium was reached. PAN demonstrated better adsorption capacity compared to PVDF at all levels of initial dye concentrations studied. Both nanofiber membranes are proposed to conform to the Dubinin-Radushkevich adsorption isotherm model. Using this model, the predicted values for the highest adsorption capacity, qmax, of PAN and PVDF NF membranes are 55.91 mg/g and 44.06 mg/g, respectively.

Highlights

• Cheap, easy to fabricate and direct use of SBS-spun nanofibers for wastewater MB dye absorption.

• “No pre-treatment” use of PAN and PVDF nanofibers as comparatively effective for MB dye removal.

• Investigation of MB initial concentration and adsorption contact time of SBS-spun PAN and PVDF membranes for MB dye removal.

• Investigation of different adsorption isotherms (i.e., Langmuir, Freundlich, and Dubinin-Radushkevich) in predicting the maximum adsorption capacities of SBS-spun PAN and PVDF membranes for MB dye removal.

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Main Subjects



Articles in Press, Corrected Proof
Available Online from 18 August 2020
  • Receive Date: 10 March 2020
  • Revise Date: 18 August 2020
  • Accept Date: 18 August 2020