Optimisation of polyethersulfone/polyaniline blended membranes using response surface methodology approach

Nor Faizah Razali, Abdul Wahab Mohammad, Nidal Hilal, Choe Peng Leo, Javed Alam

Research output: Contribution to journalArticle

Abstract

In the study, polyaniline (PANI) nanoparticles were used as polymeric additives in order to improve polyethersulfone (PES) structure and performance. A major role of PANI nanoparticles in PES membranes is to improve the hydrophilic properties and permeability of the substrate membrane. The central composite design (CCD) of the response surface method (RSM) was used for the optimisation of blended PES/PANI membranes. The objectives were to obtain the optimum operating variables and to observe interactions among the variables. The factors considered were the PES concentration, PANI concentration and evaporation time during the casting process, while pure water permeability, salt rejection and contact angle values were considered as the responses. The design of experiment (DoE) managed to develop models that related the responses with the operating variables which were further analysed by analysis of variance (ANOVA). The optimal conditions were 18.33wt.% PES, 0.75wt.% PANI and 1.34min of evaporation time with the predicted results of water permeability, salt rejection and contact angle of 62.2L/m2hbar, 32.4% and 54.95°, respectively. The interaction graph shows that there was a strong interaction between the variables of PES concentration (A), PANI concentration (B) and evaporation time (C). With additional characterisation, the optimised membrane showed an improvement in the membrane structure when observed by SEM. The addition of nanoparticles evidently increased the membrane surface roughness, as observed in the AFM images. The membrane pore size distribution was also obtained from the AFM images which showed a difference between the control (1-6nm) and blended (2-40nm) membranes. The membrane surface charge showed that the blended membrane has the highest charge at low and high pH with iso-electric point at pH3 while there is no iso-electric point obtained for a controlled membrane.

Original languageEnglish (US)
Pages (from-to)182-191
Number of pages10
JournalDesalination
Volume311
DOIs
StatePublished - Feb 5 2013

Fingerprint

Polyaniline
membrane
Membranes
Evaporation
evaporation
Nanoparticles
permeability
Contact angle
Salts
polyether sulfone
polyaniline
response surface methodology
Membrane structures
salt
Water
Surface charge
Analysis of variance (ANOVA)
Design of experiments
Pore size
surface roughness

Keywords

  • Blended membrane
  • Nanoparticle
  • Polyaniline
  • Polyethersulfone
  • Response surface method

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Water Science and Technology
  • Mechanical Engineering

Cite this

Optimisation of polyethersulfone/polyaniline blended membranes using response surface methodology approach. / Razali, Nor Faizah; Mohammad, Abdul Wahab; Hilal, Nidal; Leo, Choe Peng; Alam, Javed.

In: Desalination, Vol. 311, 05.02.2013, p. 182-191.

Research output: Contribution to journalArticle

Razali, Nor Faizah ; Mohammad, Abdul Wahab ; Hilal, Nidal ; Leo, Choe Peng ; Alam, Javed. / Optimisation of polyethersulfone/polyaniline blended membranes using response surface methodology approach. In: Desalination. 2013 ; Vol. 311. pp. 182-191.
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AB - In the study, polyaniline (PANI) nanoparticles were used as polymeric additives in order to improve polyethersulfone (PES) structure and performance. A major role of PANI nanoparticles in PES membranes is to improve the hydrophilic properties and permeability of the substrate membrane. The central composite design (CCD) of the response surface method (RSM) was used for the optimisation of blended PES/PANI membranes. The objectives were to obtain the optimum operating variables and to observe interactions among the variables. The factors considered were the PES concentration, PANI concentration and evaporation time during the casting process, while pure water permeability, salt rejection and contact angle values were considered as the responses. The design of experiment (DoE) managed to develop models that related the responses with the operating variables which were further analysed by analysis of variance (ANOVA). The optimal conditions were 18.33wt.% PES, 0.75wt.% PANI and 1.34min of evaporation time with the predicted results of water permeability, salt rejection and contact angle of 62.2L/m2hbar, 32.4% and 54.95°, respectively. The interaction graph shows that there was a strong interaction between the variables of PES concentration (A), PANI concentration (B) and evaporation time (C). With additional characterisation, the optimised membrane showed an improvement in the membrane structure when observed by SEM. The addition of nanoparticles evidently increased the membrane surface roughness, as observed in the AFM images. The membrane pore size distribution was also obtained from the AFM images which showed a difference between the control (1-6nm) and blended (2-40nm) membranes. The membrane surface charge showed that the blended membrane has the highest charge at low and high pH with iso-electric point at pH3 while there is no iso-electric point obtained for a controlled membrane.

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