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Raja Norimie Raja Sulaiman,Norul Fatiha Mohd Noah,Norasikin Othman,Norela Jusoh,Muhammad Bukhari Rosly 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.3
Hazardous hexavalent chromium (Cr(VI)) released from the electroplating industry beyond the discharge concentration limit has created great concern worldwide. Solvent extraction (SX) is an effective method for metal separation from an aqueous system. Throughout this work, novel synergistic solvent extraction of Cr(VI) from rinsed electroplating wastewater was performed using a mixture of two organophosphorus acidic extractants containing di-2,4,4- trimethylpentyl phosphinic acid (Cyanex 272) and di-2,4,4-trimethylpentyl mono-thio-phosphinic acid (Cyanex 302) in kerosene. The results showed almost 99±0.816% of Cr(VI) was synergistically reduced and extracted to the less toxic trivalent chromium (Cr(III)) using the total mixture concentration of 0.1 M (0.04 M Cyanex 272+0.06 M Cyanex 302). For recycling, the organic phase was recycled or reused up to 11 times for excellent extraction (99±0.471%) and stripping (99±0.942%) and became stable afterwards until a certain time. The total concentration of the mixture system was reduced by 50% (0.05 M) using 0.01 M Cyanex 272 and 0.04 M Cyanex 302, with almost 100% of Cr(VI) extraction as less toxic Cr(III). The Cr(III) in the loaded organic phase was completely recovered using 7.0 M hydrochloric acid (HCl). It is concluded that the synergistic extraction using Cyanex 272/Cyanex 302 system improved the Cr(VI) extraction and reduced the chemical consumption in the organic phase.
Extraction of reactive dye via synergistic Aliquat 336/D2EHPA using emulsion liquid membrane system
Raja Norimie Raja Sulaiman,Hilmi Abdul Rahman,Norasikin Othman,Muhammad Bukhari Rosly,Norela Jusoh,Norul Fatiha Mohd Noah 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.1
Facilitated transport of Orange 3R was performed by means of emulsion liquid membrane (ELM) technique containing double extractants of Aliquat 336 and D2EHPA as extractant and synergist extractant, respectively. Cooking palm oil, sorbitan monooleate (Span 80), and sodium hydroxide were used as diluent, surfactant and stripping agent, respectively. Several parameters influencing the extraction of Orange 3R via ELM, namely effect of extraction time, agitator speed, Span 80 concentration and treatment ratio, were experimentally investigated and optimized using response surface methodology (RSM). Results demonstrated that about 91% of Orange 3R was successfully extracted under optimum conditions of 12minutes of extraction time, 413 rpm of agitator speed, 3.2% (w/v) of sorbitan monooleate, and 1 : 9.8 of treatment ratio. Additionally, the aforementioned optimum conditions were found to be more suitable to treat low concentration of Orange 3R (less than 100 ppm) from simulated textile wastewater. The findings reveal that reactive Orange 3R dye is able to be selectively extracted using double extractants via sustainable ELM process as well as providing high potential application in the dye removal from industrial textile wastewater.
Emulsion liquid membrane stability in the extraction of ionized nanosilver from wash water
Raja Norimie Raja Sulaiman,Norasikin Othman,Nor Aishah Saidina Amin 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
The discharge of ionized nanosilver into environment triggers a great concern owing to the toxicity problem for aquatic organism. In this study, emulsion liquid membrane used to extract the ionized nanosilver from wash water. Variables like carrier, stripping agent and surfactant concentrations, emulsifying time, homogenizer and agitation speed, pH feed phase, and effect of ionic liquid [BMIM]+[NTf2]- were investigated. The membrane phase containing Cyanex 302, Span 80, acidic Thiourea, and kerosene as carrier, surfactant, stripping agent, and diluent respectively. Results demonstrated that 99.89% of silver ion was extracted and ionic liquid show good performance on emulsion stability with 10% swelling.
Behavior Characteristics of Density Currents Due to Salinity Differences in a 2-D Water Tank
Woo-Dong Lee,Norimi Mizutani,Dong-Soo Hur 한국해양공학회 2018 韓國海洋工學會誌 Vol.32 No.4
In this study, a hydraulic model test, to which Particle Image Velocimetry (PIV) system applied, was used to determine the hydrodynamic characteristics of the advection-diffusion of saltwater according to bottom conditions (impermeable/permeability, diameter, and inclination) and the difference of the initial salt. Considering quantitative and qualitative results from the experiment, the characteristics of the density current were discussed. As an experimental result, the advection-diffusion mechanism of salinity was examined by the shape of saltwater wedge and the flow structure of density currents with various bottom conditions. The vertical salt concentration obtained from the experiment was used as quantitative data to calculate the diffusion coefficient that was used in the numerical model of the advection-diffusion of saltwater.
Norela Jusoh,Norasikin Othman,Raja Norimie Raja Sulaiman,Norul Fatiha Mohamed Noah,Muhammad Abbas Ahmad Zaini 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2
The emulsion liquid membrane (ELM) process for silver recovery containing synergistic Cyanex 302/Cyanex 272 carriers, palm oil as a diluent, acidic thiourea as a stripping agent, and sorbitan monooleate (Span 80) as a surfactant was attempted. A suitable range of mixed carrier concentration on the facilitated extraction performance of silver was first determined. Response surface methodology (RSM) was applied to optimize and evaluate the effect of mixed carrier concentration, stripping agent concentration, and treat ratio on the stability of the process. The results showed that the system was stable with no breakage or swelling. At the optimum condition of 8.26/12.39mM Cyanex 302/Cyanex 272, 1.27 M acidic thiourea, and 0.62 treat ratio, the silver extraction performance and recovery were 97% and 54% (4.33 times enrichment), respectively. Further modification of the process and addition of 5% w/v of modifier resulted in 6.57 times enrichment, which accounted for 82% of the silver recovery. Hence, this study shows the capability of silver recovery using a synergistic ELM process and potential to be applied in industrial effluent.
Norul Fatiha Mohamed Noah,Norela Jusoh,Norasikin Othman,Raja Norimie Raja Sulaiman,Nurul Asma Mohd Khairul Parker 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
This research addresses the development of stable green ELM process for chromium removal from industrial effluents where CrO42− and Cr2O72− is the predominant species. Types of carriers, diluents and stripping agents undergo screening via LLE process. Meanwhile, the parameters studied for ELM stability and extraction were surfactant and modifier concentrations, homogenizer speed and emulsifying time. The formulate condition of stable ELM process was 0.04 M TOMAC in palm oil, 0.05 M NaOH, 3% (w/v) Span 80, 5% (w/v) octanol, 10,000 rpm homogenizer speed and 3 min emulsifying time. At this condition, 97% of chromium was extracted with breakage rate of 10%.