Dalam kajian ini, polyvinylidene fluorida (PVDF) - zarah nano silicon dioksida (SiO2 NPs) membran matriks b ercampur telah disediakan dengan menggunakan teknik pemisahan fasa teraruh resapan (DIPS). Kesan parameter sintesis membran, iaitu kepekatan polimer (81-82 wt.%), ketebalan tuangan membran (200μm), dan kepeaktan TiO2 (0-1wt.%) terhadap penolakan dan penelapan fluks air terhasil telah dikaji. Untuk mengoptimumkan parameter sintesis membran matriks bercampur, kesan interaktif parameter tersebut telah dinilai berdasarkan metodologi permukaan sambutan (RSM) berserta dengan reka bentuk komposit pusat (CCD). Sifat-sifat fizikal PVDF-SiO2 membran matriks bercampur dinilai berdasarkan kelikatan larutan polimer, taburan saiz liang, keporosan membran, mikroskop elektron imbasan pancaran medan (FESEM) spektroskopi inframerah ubah fourier (FTIR), dan sudut sentuh. Ia telah didapati bahawa parameter kajian tersebut menpengaruhi sifat-sifat termodinamik dan kinetic larutan polimer secara serentak yang membawa kepada kesan perubahan morfologi dan prestasi membran. Parameter sintesis membran optimum diperolehi dengan menggunakan kepekatan polimer 81.5 wt.%, ketebalan tuangan 200 μm dan kepekatan SiO2 0.5 wt.%. Membran tulen dan membran matriks bercampur optimum seterusnya dikaji dan dibanding dalam keadaan operasi yang berbeza serta sifat pembersihan sendiri. Membran matriks bercampur optimum menunjukkan penolakan air terhasil yang lebih tinggi berbanding dengan membran pluronic dan pegma, iaitu 99.31%, 97.63%, dan 98.44%, masing-masing. Ketiga-tiga membran menunjukkan kecekapan penolakan yang baik. Nisbah pemulihan fluks (FRR) didapati adalah 20%, 3.94% and 17.16% untuk membran tulen, pluronic dan pegma membran matriks bercampur optimum, masing-masing. Fluks pemulihan lengkap diperhatikan bagi membran matriks bercampur optimum menunjukkan bahawa membran dengan penambahan SiO2 nenunjukkan sifat pembersihan sendiri dengan lebih baik selepas pancaran cahaya ultra ungu.
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In this study, polyvinylidene fluoride (PVDF) - Silicon dioxide nanoparticles (SiO2 NPs) mixed-matrix membranes were prepared via diffusion induced phase separation (DIPS) technique. The effect of membrane synthesis parameter, namely polymer concentration (81-82 wt.%), membrane casting thickness (200 μm), and SiO2 concentration (0-1 wt.%) towards rejection and permeation flux of produced water were investigated. In order to optimize the mixed-matrix membrane synthesis parameter, the interactive effects of these parameters were evaluated based on response surface methodology (RSM) coupled with central composite design (CCD). The physical properties of PVDF-TiO2 matrix membranes were characterized based on polymer solution viscosity, pore size distribution, field emission scanning electron microscope (FESEM) fourier transform infrared spectroscopy (FTIR) and contact angle. It was found that these parameters were simultaneously affecting the thermodynamic and kinetic properties of the polymer solution which leads to the significant effect on membrane morphology and performance. The optimum membrane synthesis parameters was obtained by having a polymer concentration of 81.5 wt.%, casting thickness of 200 μm and SiO2 mixed- concentration of 0.5 wt.%. The neat and optimized mixed-matrix membranes were further investigated and compared under different operation conditions and its self cleaning properties. Optimized mixed-matrix membrane shows higher rejection as compared to additive-mixed membrane, pluronic and pegma. which was 99.31%, 97.63%, and 98.44% respectively. Three of the membranes showed excellent removal efficiency. The flux recovery ratios (FRR) were observed to be 20%, 3.94% and 17.164% for 0.5wt% SiO2 membran,Pluronic and Pegma, accordingly. The complete flux recovered was observed for optimized mixed-matrix membrane indicated that membrane with embedded SiO2 irradiation perform better self-cleaning property after ultraviolet (UV) light.
Synthesis of pvdf-sio2 nanocomposite membrane for produced water removal / Meor Abdul Rahman Meor Hashim