Extraction of Ionized Nanosilver by Emulsion Liquid Membrane Using Cyanex 302 as a Mobile Carrier

2014 ◽  
pp. 463-469
Author(s):  
Raja Norimie Raja Sulaiman ◽  
Norasikin Othman ◽  
Nor Aishah Saidina Amin ◽  
Noor Haziqah Kamaludin ◽  
Nur Na Illah Sallih Udin
Keyword(s):  
Liquid Membrane ◽  
Emulsion Liquid Membrane ◽  
Cyanex 302 ◽  
Mobile Carrier

scholarly journals Emulsion Liquid Membrane Extraction of Silver from Photographic Waste using Tetramethylthiuram Disulfide (TMTDS) as a Mobile Carrier

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Norasikin Othman ◽  
Chan Kit Hie ◽  
Chiong Tung ◽  
Hanapi Mat ◽  
Masahiro Goto
Keyword(s):  
Heavy Metals ◽  
Liquid Membrane ◽  
Raw Materials ◽  
Precious Metals ◽  
Membrane Extraction ◽  
Industrial Wastes ◽  
Emulsion Liquid Membrane ◽  
Tetramethylthiuram Disulfide ◽  
Mobile Carrier ◽  
Liquid Membrane Extraction

The recovery of precious metals such as silver from photographic wastes is required in order to save raw materials and to protect the environment from dispersed compound, especially heavy metals. For that matter, several technologies have been used such as precipitation, electrolytic, and ion exchange processes which offer some advantages as well as drawbacks over others. Recently, emulsion liquid membrane extraction has been recognized to be a potential process for industrial wastes treatment and recovery of heavy metals. This process has the ability to selectively separate and rapidly concentrate metals through its very thin layer liquid membrane which has a large interfacial area. An attempt was made to recover silver from liquid photographic wastes using tetramethylthiuram disulfide as a mobile carrier. The important variables affecting the emulsion liquid membrane (ELM) process including residence time, surfactant concentration, carrier concentration, level of agitation and phase ratio between emulsion and feed phase were investigated. The results showed that tetramethylthiuram disulfide is selective towards silver (>80%) compared to other metals in the photographic waste. The highest silver extraction is obtained using 0.05 M tetramethylthiuram disulfide, 3% (w/v) Span 80, 300 rpm stirring speed, 1.0 M thiourea in 0.1 M HCl stripping agent, 1:3 of treat ratio, and toluene as the diluent.

Selective Extraction of Palladium from Simulated Liquid Waste Solution by Emulsion Liquid Membrane Process using D2EHPA as a Mobile Carrier

2014 ◽  
Vol 69 (9) ◽  
Author(s):  
Norasikin Othman ◽  
Norul Fatiha Mohamed Noah ◽  
Norlisa Harruddin ◽  
Nurul Ashida Abdullah ◽  
Siti Khadijah Bachok
Keyword(s):  
Liquid Membrane ◽  
Liquid Waste ◽  
Precious Metals ◽  
Selective Extraction ◽  
Extraction Process ◽  
Extraction Time ◽  
Emulsion Liquid Membrane ◽  
Waste Solution ◽  
Mobile Carrier ◽  
Gold Silver

Liquid semiconductor waste has become a serious problem to the environment due to the toxicity of heavy metals in the wastewater. However the monetary value of precious metals such as gold, silver and palladium has become a great concern nowadays. Therefore this study is investigating the recovery of palladium by emulsion liquid membrane (ELM) process using di-(2-ethylhexyl) phosphoric acid (D2EHPA) as a carrier. The important parameters affecting the extraction of palladium such as concentrations of carrier and stripping agents, extraction time and treat ratio were investigate. This experiment was conducted using a mixer-settler in a batch system. The results showed that more than 90% of palladium was extracted using 0.05M D2EHPA, 0.1 M H2SO4 as a stripping agent, 5 minutes extraction time, and 1:3 treat ratio. However, the study on emulsion stability showed unstable results due to the leakage and swelling occurrence during the extraction process. As a conclusion, the research shows that ELM has the potential to extract palladium from simulated waste solution using D2EHPA as a mobile carrier.

Emulsion liquid membrane pertraction of L-lysine from dilute aqueous solutions by D2EHPA mobile carrier

Desalination ◽  
2006 ◽  
Vol 190 (1-3) ◽  
pp. 161-171 ◽  
Author(s):  
Tahereh Kaghazchi ◽  
Ali Kargari ◽  
Reza Yegani ◽  
Abbas Zare
Keyword(s):  
Aqueous Solutions ◽  
Liquid Membrane ◽  
Emulsion Liquid Membrane ◽  
Mobile Carrier ◽  
Dilute Aqueous Solutions

Recovery of Sc3+ from Red Mud Leaching Solution by Emulsion Liquid Membrane

2011 ◽  
Vol 335-336 ◽  
pp. 1465-1468 ◽  
Author(s):  
Cui Zhen Wang ◽  
Guang Zhu Zhou ◽  
Xiao Yan Kou ◽  
Zi Long Zheng
Keyword(s):  
Optimum Condition ◽  
Aqueous Phase ◽  
Red Mud ◽  
Surfactant Concentration ◽  
Liquid Membrane ◽  
Emulsion Liquid Membrane ◽  
Mobile Carrier ◽  
Aqueous Phase Acidity ◽  
Leaching Solution ◽  
Sulfonated Kerosene

In this paper, recovery of scandium from red mud leaching solution by emulsion liquid membrane (ELM) was studied. Composition of ELM is P507+ span80 + sulfonated kerosene + HCl. Effects of mobile carrier and surfactant concentration, Roi, Rwe, internal and external aqueous phase acidity on the extracting rate of Sc3+were studied. Results show that it is feasible for ELM extracting Sc3+from the red mud leaching solution. The optimum condition for ELM extracting scandium from the red mud is P507%=8%, Span80%=7%, Roi=2:3, Rwe=6, internal aqueous c(HCl)=2 mol/L, external aqueous phase pH=2. The extracting rate of Sc3+can reach to 98% under optimal condition.

scholarly journals Recovery of Ionized Nanosilver from Wash Water Solution using Emulsion Liquid Membrane Process

2013 ◽  
Vol 65 (4) ◽  
Author(s):  
Raja Norimie Raja Sulaiman ◽  
Norasikin Othman ◽  
Nor Aishah Saidina Amin
Keyword(s):  
Liquid Membrane ◽  
Water Solution ◽  
Absorption Spectrometry ◽  
Wash Water ◽  
Extraction Time ◽  
Ionic Form ◽  
Emulsion Liquid Membrane ◽  
Sorbitan Monooleate ◽  
Cyanex 302 ◽  
Internal Phase

The increasing numbers of product containing nanosilver have raised a great concern about their possible impact in the environment especially in the ionic form which leads to the toxicity problem when the association occurs with the organism cells. Therefore, the main focus of this study was to investigate several parameters influencing the recovery of ionized nanosilver from wash water using emulsion liquid membrane (ELM) process. This process involves three phases dispersion system including external, membrane and internal phase. The membrane phase was prepared by dissolving bis [2, 4, 4-trimethylpentyl] monothiophosphinic acid (Cyanex 302) as a carrier and Sorbitan Monooleate (Span 80) as a surfactant in kerosene as a diluent. Thiourea in Sulfuric acid (H2SO4) was used as a stripping agent in the internal phase. The important parameters such as extraction time, carrier and stripping agent concentrations were investigated. All experiments were conducted in batch system. The concentration of the ionized nanosilver was measured using Atomic Absorption Spectrometry (AAS). The result demonstrated that almost 100% of silver ion was extracted with 91% have been recovered within 5 minute of extraction time using 0.005 M Cyanex 302 and 1.0 M Thiourea in 1.5 M H2SO4. Hence, ELM was proven to be a very promising technique for the simultaneous extraction and recovery of ionized nanosilver from wash water.

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