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Ani Idris,Nur Suriani Mohd Ismail,Nursia Hassan,Effaliza Misran,Audrey-Flore Ngomsik 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
Magnetic alginate beads were successfully synthesized by incorporating ferrofluids based on maghemite nanoparticles (g-Fe2O3) and sodium alginate. The as-obtained dried sample characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed that the size of uncoated and citrate coated g-Fe2O3 to be 15 nm and 9 nm respectively. Fourier transform infrared (FTIR) was performed so as to ensure successful coating process. The specific saturation magnetization (ss) value of coated particles was found to be lower than the uncoated particles. Zero coercivity of the magnetization curve indicated that the particles were superparamagnetic in nature. By using a ratio 1:10 of ferrofluids and alginate solution respectively, magnetic beads were prepared and the ability of magnetic beads to remove Pb(II) ion from aqueous solutions in batch media was investigated. Various physico-chemical parameters such as pH,initial metal ion concentration, and equilibrium contact time were also studied. The results revealed that 95.2% of the Pb(II) was removed within 2 h at pH 7. The equilibrium amount of Pb(II) adsorbed onto the magnetic beads approached a constant value with increasing concentrations suggesting that the uptake of Pb(II) followed a Langmuir-type adsorption equation with qmax of 50 mg/g. Moreover, the presence of the magnetic particles in the beads allowed easy isolation of the beads from the aqueous solutions after the sorption process. In order to determine the reusability potential of the adsorbent, the isolated beads were used as a regenerated sorbent in repeated sorption–desorption cycles. Results revealed that the magnetic beads produced can be potentially used for the treatment of waste water contaminated with heavy metals and regenerated at least five times before losing their activity.
Ani Idris,Effaliza Misran,Noordin Mohd Yusof 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6
In this study the toxic Cr(VI) which is a common pollutant to the environment is removed from the aqueous solution using the one step photocatalytic reduction to Cr(III) using PVA-alginate encapsulated gFe2O3 magnetic beads. The photocatalytic reduction of Cr(VI) by PVA-alginate encapsulated gFe2O3 magnetic beads was examined under sunlight and other 4 types of lamp: xenon lamp, black light bulb (BLB) lamp, light emitting diode (LED) lamp and fluorescent lamp. The experiments were performed at pH 1, initial Cr(VI) = 50 mg/L and the photocatalyst dosage of maghemite nanoparticles was kept at 8% (v/v). Removal of Cr(VI) was best under sunlight; 100% removal in 30 min, followed by xenon lamp; 100% removal in 100 min, BLB lamp; 70% removal in 100 min. LED and fluorescent lamp have about the same removal rate; 50% removal in 100 min. The Cr(VI) reduction using PVA-alginate magnetic beads fitted the Langmuir–Hinshelwood (L–H) kinetics model with a correlation coefficient (R2) of 0.972. The PVAalginate magnetic beads were capable of treating industrial chromium waste containing 300 mg/L Cr(VI) within 2 h under sunlight.
Zohreh Majidnia,Ani Idris 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.6
Both maghemite (γ-Fe2O3) and titanium oxide (TiO2) nanoparticles were mixed at various ratios and embedded in polyvinyl alcohol (PVA)-alginate beads. These beads were tested for photocatalytic behavior in eliminating toxic Cd(II) from the aqueous solution. The photocatalytic experiments were performed under sunlight irradiation at various pH, initial feed concentrations and γ-Fe2O3: TiO2 ratios. The recycling attribute of these beads was also investigated. The results revealed that 100% of the Cd(II) was eliminated in 150 minutes at pH 7 under sunlight. It shows that maghemite and titania PVA-alginate beads can be readily isolated from the aqueous solution after the photocatalyst process and reused for at least six times without losing their initial properties.
Chan Mieow Kee,Ani Idris 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6
Cellulose acetate polymeric solutions with different concentrations of monosodium glutamate in formic acid were prepared using both traditional and microwave heating methods. The membrane separation performance and its physical properties were evaluated. Results indicated that the membrane consisting of 6 wt% additive prepared using microwave heating exhibited better solute permeability. Microwave heating was also found to enhance the thermal stability and the surface roughness of the membrane. The use of microwave for membrane fabrication not only saves time and cost, but also produces membranes with good properties. This paper therefore discusses the plausibility of manufacturing membranes using microwave heating techniques.
Modification of PES membrane by PEG-coated cobalt doped iron oxide for improved Cu(II) removal
Kian Hwa Chan,Ani Idris,Ee Ting Wong,Noordin Mohd Yusof 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Modification of membranes using nanoparticles is another latest trend in membrane technology. In thiswork, the hydrophobic cobalt(II) doped iron oxide nanoparticles were coated with polyethylene glycol ofmolecular weight 600 so as to prevent their agglomeration thus improving their dispersion when addedinto the dope solution containing 20 wt% of polyethersulfone in dimethylformamide. The nanomodifiedmembranes were characterized in terms of flux permeation (Q), wetting ability, contact angle, pore sizeand solute rejection. These membranes were then used to remove Cu(II) and its separation efficiency wasfound to improve significantly
Polyvinyl alcohol–alginate ferrophoto gels for mercury(II) removal
Azura Hanis A. Rahman,Chee Loong Teo,Ani Idris,Effaliza Misran,Siti Asma’ Nikmat Leong 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
Maghemite (g-Fe2O3) nanoparticles were embedded in polyvinyl alcohol (PVA) and alginate matrix toproduce beads that could be easily recovered with external magnetic field after treating mercury, Hg(II)in aqueous solution. 96% of Hg(II) was removed in 4 h under sunlight, at pH 11 and 16% (v/v) ofphotocatalyst dosage. FESEM results revealed that the beads possessed significant superporositystructure that greatly supported mass transfer of Hg(II) inside the beads. The removal of Hg(II) fitted wellwith Langmuir–Hinshelwood (L–H) model exhibiting R2 (correlation coefficient) value of 0.9771. Thus,this study proved that it was feasible to treat Hg(II) solution with g-Fe2O3–PVA–alginate beads.
Kian Hwa Chan,Ee Ting Wong,Muhammad Irfan Khan,Ani Idris,Noordin Mohd Yusof 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Nano-modification of membrane is another latest technique used to improve the membrane performance. In this paper, the influence and interaction of functionalized multiwall carbon nanotube (FMWCNT) with polyethylene glycol (PEG) as an additive on polyvinylidene difluoride (PVDF) membrane was investigated. The nano-modified membranes were then characterized in terms of pure water permeation (PWP), molecular weight cut-off (MWCO), contact angle, and calculated pore size distributions. Fourier transform infrared spectroscopy (FT-IR) and Scanning Electron Microscope (SEM) were then used to characterize the structure and morphology of the membranes. The separation properties of the membranes with respect to bovine serum albumin (BSA) retention, urea and creatinine clearances were investigated. The results revealed that the interaction of FMWCNT with PEG as an additive has improved the performance of PVDF as a potential dialysis membrane in terms of PWP, hydrophilicity retention, urea and creatinine clearances.