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RISS 인기검색어
- 검색키워드
- 저자 : Effaliza Misran (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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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.
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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.
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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.
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