Abstract
Commercial nanofiltration polyethersulfone (NF2) membrane was modified via ultraviolet (UV) photografting to prepare a high-performance forward osmosis (FO) membrane. The optimized condition of grafting parameters was obtained using central composite design (CCD) and response surface methodology (RSM). UV-photografting time and acrylic acid (AA) monomer concentration were the considered variables, while the two RSM responses were water permeate flux and reverse salt diffusion flux (RSD). Quadratic models were established between the responses and the independent parameters using analysis of variance (ANOVA). The membranes were characterized with functional group, morphology and surface roughness. The obtained optimum conditions were 2.81 min grafting time and 27.85 g/L AA monomer concentration. Under these conditions, a maximum water permeate flux of 1.52±0.04 L/m2·h was achieved with an RSD value of 10.09±0.36 g/m2·h. The optimized membrane exhibited a higher water flux compared to the unmodified NF2 membrane without any significant change of the RSD value.
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Abbreviations
- AA:
-
Acrylic Acid
- AFM:
-
Atomic Force Microscopy
- ANOVA:
-
Analysis of variance
- CTA:
-
Cellulose Tri-Acetate
- CCD:
-
Central Composite Design
- DI:
-
Deionized
- FO:
-
Forward Osmosis
- FS:
-
Feed side
- ICP:
-
Internal Concentration Polarization
- MAA:
-
Methacrylic Acid
- NF:
-
Nanofiltration
- PES:
-
Polyethersulfone
- PEI:
-
Polyethylenimine
- RSM:
-
Response Surface Modelling
- RSS:
-
Red Sea Salt
- UV:
-
Ultraviolet
- AL-FS:
-
Active Layer-Feed Side
- A:
-
Membrane surface area [m2]
- b:
-
Regression coefficient for coded factors
- C:
-
Monomer concentration [g/L]
- Jw :
-
Water permeate flux [(L/m2·h]
- Y:
-
Predicted Response
- S a :
-
Surface Roughness [nm]
- S q :
-
Root mean square [nm]
- S z :
-
Maximum peak [nm]
- t:
-
Grafting time [min]
- V:
-
Volume [L]
- Zavg :
-
Average value of the height [nm]
- Z i :
-
Current height [nm]
- α :
-
Axial point
- g:
-
Regression coefficient for actual factors
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Acknowledgements
The authors gratefully acknowledge the financial support of Universiti Malaysia Pahang under the Postgraduate Research Grant Scheme (PGRS180389), the Fundamental Research Grant Scheme (FRGS/1/2016/TK02/UMP/02/8; RDU160127), the Ministry of Higher Education, Malaysia for the PhD scholarship of Ahmad Fikri Hadi Abdul Rahman, and the support of the Spanish Ministry of Economy and Competitiveness through its project CTM2015-65348-C2-2-R and the Spanish Ministry of Science, Innovation and Universities through its project RTI2018-096042-B-C22.
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Rahman, A.F.H.A., Khushairi, Z.A., Seman, M.N.A. et al. Optimization of UV-photografting factors in preparation of polyacrylic-polyethersulfone forward osmosis membrane using response surface methodology. Korean J. Chem. Eng. 38, 2313–2323 (2021). https://doi.org/10.1007/s11814-021-0881-6
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DOI: https://doi.org/10.1007/s11814-021-0881-6