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Synthesis and Characterization of Poly(methyl methacrylate)/SiO2 Hybrid Membranes: Effect of Silica Contents on Membrane Structure Muhammad Ali Zulfikar; Abdul Wahab Mohammad
Jurnal Matematika & Sains Vol 11, No 4 (2006)
Publisher : Institut Teknologi Bandung

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Hybrid organic-inorganic based on poly(methyl methacrylate)/SiO2 (PMMA/silica) membranes were prepared using sol-gel technique under acidic conditions with different tetraethoxy orthosilane (TEOS) concentration. The thin membrane films were characterized using water permeability, water uptake, size porosity, Fourier Transform Infra Red (FTIR) and SEM analysis. Dispersion of particles in the nano scale was only possible with addition of TEOS above 10%. Organic-inorganic solutions with compositions varying from 100 PMMA/ TEOS 0 to 75 PMMA/25 TEOS were used to cast the asymmetric membranes. Water permeability, water up take and porosity size increase as TEOS content increases. SEM analysis showed that the membrane morphology changed from co-continuous phase to nodule structure if 10% TEOS was added, then return to co-continuous phase again when above 15% of TEOS was added.
Optimization Of Palm Oil Mill Effluent Treatment By Applying RSM And ANN Muhammad Said; Muneer M Ba-Abbad; Abdul Wahab Mohammad
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 1, No 1 (2016): February 2016
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v1.i1.07


AbstractThe optimization of the COD removal from palm oil mill effluent (POME) has done. The correlation of concentration and pH of POME, and Trans membrane pressure (TMP) of Reverse Osmosis (RO) membrane was optimized by response surface method using a second order polynomial model with Box Behken design consist of 17 runs. To determine whether the model was adequate for representing the experimental data; it was indicated by the ANNOVA table (p-value, lack of fit and R2 values).  The main factor influenced the COD removal was concentration and pH of POME.  The optimum conditions were determined from 3D response surface and 2D contour graphs i.e. 28.30% of POME concentration at pH 10.75 and TMP 0.69 kPa to yield 24.1372 mg/L of COD value. The results demonstrate that the response surface method effective to minimize the number of experiment. Keywords: POME; RO membrane; RSM; ANN; COD
Adsorption of Copper from aqueous solution by chitosan using molecular imprinting technology Sepehr Azizkhani; Ebrahim Mahmoudi; Arefeh Emami; Siti Aslina Hussain; Abdul Wahab Mohammad
Science and Technology Indonesia Vol. 3 No. 4 (2018): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (878.853 KB) | DOI: 10.26554/sti.2018.3.4.141-146


In nature chitosan is a plentiful polymer with high heavy metal ion uptake capacity due to chitosan’s functional groups that chelate with the positive surfaces of heavy metal ions. In this study, epichlorohydrin was used as a crosslink to prepare the copper-imprinted chitosan as a pattern to enable the selectivity property and increase adsorption capacity. The effects of the cross-linker, PH, initial concentration and time were examined in this study to identify the optimum amount of each to remove copper metal ions from waste water by imprinted chitosan. This composite was characterized by Fourier-transform infrared spectroscopy (FTIR) test to determine the existence of copper ions in chitosan crosslinked with epichlorohydrin. Scanning electron microscopy (SEM) tests were also done to compare the surfaces of crosslinked chitosan and the removal of copper by imprinted chitosan. PH adsorption was tested from 3 to 7 and the initial concentration and time investigated were between 10 and 100 mg/l and 0 and 120 minutes respectively. The maximum capacity to adsorb was found to be at PH 7, initial concentration of 100mg/l at 90 minutes with 0.1 gr chitosan. Ultimately, the maximum adsorbent amount achieved for effective Cu(II) removal was 74.37 mg/g.
Palm Oil Mill Effluent Treatment Through Combined Process Adsorption and Membrane Filtration Muhammad Said; Siti Rozaimakh Sheikh Abdullah; Abdul Wahab Mohammad
Sriwijaya Journal of Environment Vol 1, No 2 (2016): Developing Without Destruction
Publisher : Program Pascasarjana Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (417.219 KB) | DOI: 10.22135/sje.2016.1.2.36-41


Abstract: The growth in palm oil production also leads to an Increase in the production of palm oil mill effluent (POME). Nowadays, POME was treated using an open lagoon but this method is ineffectiveness in complying with the standards for water disposal. Therefore, efficient and cohesive treatment system is highly desired to ensure the final discharge of the treated water meets the effluent discharge standards. Initially, the POME was treated through adsorption, followed by UF membranes roomates were intended to reduce COD, TSS and turbidity up to 88%, 99%, and 98%, while the final treatment of RO membranes can reduce BOD, COD and color up to 92%, 98% and 99%. To determine the optimum condition of the RO membrane, response surface methodology (RSM) was used. The results showed there was correlation between all key variables. POME concentration, trans-membrane pressure, pH and time would give significant effects in reducing the parameters in POME treatment with the optimum condition of 15.77% for POME concentration, 3.73 for pH, 0.5 bar trans-membrane pressure and 5 hours for filtration time. To predict COD removal, the results were analyzed by applying the artificial neural network (ANN) to derive a mathematical model.Keywords: POME, Adsorption, Membrane filtration, COD, RSM, ANNAbstrak (Indonesian): Pertumbuhan produksi minyak kelapa sawit juga meningkatkan produksi air buangan minyak kelapa sawit (POME). Sekarang ini, POME diolah menggunakan kolam terbuka tetapi metode ini tidak efisien dan tidak memenuhi persyaratan standar air buangan industri. Oleh karena itu, diperlukan suatu sistem pengolahan yang efektif dan terpadu untuk memastikan air buangan pada tahap akhir telah memenuhi standar air buangan.  Pada awalnya, POME diolah melalui adsorpsi dan diikuti oleh membran UF dengan tujuan untuk mengurangi kadar COD, TSS dan kekeruhan hingga 88%, 99% dan 98%, masing-masing.  Sementara itu, pada proses akhir digunakan membran RO yang berhasil menurunkan kadar BOD, COD dan warna hingga 92%, 98%, dan 99%, masing-masing.  Untuk menentukan kondisi optimum dari membran RO digunakan metode respon permukaan (RSM).  Hasil memperlihatkan ada korelasi antara semua variabel. Konsentrasi POME, tekanan trans membran, pH aturan dan waktu memberikan pengaruh penting dalam pengurangan parameter pada pengolahan POME, dengan kondisi operasi optimum sebagai berikut: 15,77% bagi konsentrasi, 3,73 bagi pH, 0,5 bar bagi tekanan trans membran, dan 5 jam waktu filtrasi.  Untuk memprediksi penghilangan COD, hasil diperiksa menggunakan metode jaringan saraf tiruan (ANN). Hal ini bertujuan untuk mendapatkan suatu model matematika.Kata kunci: POME, Adsorpsi, Membran filtrasi, COD, RSM, ANN