Removal of Zinc Ions from Water Using Emulsion Liquid Membrane

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Adel Al-Hemiri ◽  
Heaven Emad Mahmoud
Keyword(s):  
Organic Solvent ◽  
Liquid Membrane ◽  
Surfactant Solution ◽  
Feed Solution ◽  
Operating Conditions ◽  
Membrane Extraction ◽  
Optimum Operating ◽  
Synthetic Surfactant ◽  
Emulsion Liquid Membrane ◽  
Aqueous Feed

In the present study, the removal of zinc from synthetic waste water using emulsion liquid membrane extraction technique was investigated. Synthetic surfactant solution is used as the emulsifying agent. Diphenylthiocarbazon (dithizone) was used as the extracting agent dissolved in carbon tetrachloride as the organic solvent and sulfuric acid is used as the stripping agent. The parameters that influence the extraction percentage of Zn+2 were studied. These are the ratio of volume of organic solvent to volume of aqueous feed (0.5-4), ratio of volume of surfactant solution to volume of aqueous feed (0.2-1.6), pH of the aqueous feed solution (5-10), mixing intensity (100-1000) rpm, concentration of extracting agent (20-400) ppm, surfactant concentration (0.2-2) wt.%, contact time (3-30) min, and concentration of strip phase (0.25-2) M . It was found that 87.4 percent of Zn+2 can be removed from the aqueous feed solution at the optimum operating conditions.

scholarly journals Emulsion Liquid Membrane Extraction of Turquoise Blue Reactive Dye–Study on Membrane Breakage and Swelling

2017 ◽  
Vol 11 (1) ◽  
Author(s):  
N. Othman ◽  
S. N. Zailani ◽  
N. Mili
Keyword(s):  
Liquid Membrane ◽  
Raw Materials ◽  
Extraction Process ◽  
Reactive Dye ◽  
Point Of View ◽  
Membrane Extraction ◽  
Hydrodynamic Condition ◽  
Emulsion Liquid Membrane ◽  
Liquid Membrane Extraction ◽  
Span 80

Reactive dyes are the principal dyes used in batik industry in Malaysia. From the environmental point of view the dyes should be removed from wastewater because they are toxic in nature. Therefore, the removal and recovery of dyes from batik industry wastewater is absolute necessity in order to save raw materials and to protect environment from hazardous compounds. An experiment was carried out using emulsion liquid membrane (ELM) process in batch system to study the extraction behaviour of Turquoise Blue which is commonly used in batik industry. Several parameters have been studied such as carrier and surfactant/emulsifier concentrations, stripping agent and extraction time. The liquid membrane was formulated using kerosene as diluent, SPAN 80 as emulsifier and tri-dodecylamine (TDA) as a carrier. Hydrodynamic condition to generate extraction process was at 1:3 treat ratio and 250 rpm stirring speed for 10 minutes while the emulsification was done at 12000 rpm for 5 minutes using homogenizer. The result obtained shows that, more than 70% of Turquoise Blue was extracted at favourable condition of 0.07 M TDA, 7% (w/v) SPAN 80 and 0.5 M Thiourea in 1 M NaOH.

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.

scholarly journals Study on Mg2+ removal from ammonium dihydrogen phosphate solution by an emulsion liquid membrane

2014 ◽  
Vol 68 (3) ◽  
pp. 341-346 ◽  
Author(s):  
JianHong Luo ◽  
Jun Li ◽  
Bao Wang
Keyword(s):  
Extraction Efficiency ◽  
Liquid Membrane ◽  
Volume Fraction ◽  
Operating Conditions ◽  
Dihydrogen Phosphate ◽  
Phosphate Solution ◽  
Ammonium Dihydrogen Phosphate ◽  
Emulsion Liquid Membrane ◽  
Internal Phase ◽  
Initial Ph

Mg2+is extracted from ammonium dihydrogen phosphate (NH4H2PO4) solution by an emulsion liquid membrane (ELM) using mono-(2-ethylhexyl) 2-ethylhexyl phosphonate (HEHPEHE)as a carrier, sulfonated liquid polybutadiene (LYF) as a surfactant and kerosene as a solvent. To study the extraction efficiency and advantages of the ELM process in the separation of Mg2+,the effects of various operating conditions on the extraction -HEHPEHE volume fraction, reaction temperature, treat ratio (emulsion phase / external phase), phase ratio (membrane phase / internal phase), agitation speed, extraction time, internal phase concentration, surfactant LYF concentration and initial pH of NH4H2PO4 solution are experimentally investigated and discussed. The results show that Mg2+ in NH4H2PO4 solution can be effectively removed by the ELM process. An extraction efficiency of more than 83.1% is attained at the optimized parameters and superior-grade NH4H2PO4can be obtained by two levels of extraction.

The Characterization of Rhenium by Atomic-Absorption Spectroscopy in Nitrous Oxide-Acetylene Flames: The Analysis of Organorhenium Compounds

1971 ◽  
Vol 25 (5) ◽  
pp. 539-541 ◽  
Author(s):  
David F. Tomkins ◽  
C. W. Frank
Keyword(s):  
Nitrous Oxide ◽  
Organic Solvent ◽  
Atomic Absorption ◽  
Atomic Absorption Spectroscopy ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Absorption Analysis ◽  
Inorganic Acids ◽  
Absorption Characteristics

This investigation of the atomic-absorption characteristics of rhenium included studies of optimum operating conditions, detection limits, interferences from various inorganic acids, and the effect of organic-solvent ratios on absorption. Atomic-absorption analysis of some organorhenium complexes are also described.

Characterization of Arsenic by Atomic Absorption Spectroscopy in Oxy-Acetylene Flames

1968 ◽  
Vol 22 (6) ◽  
pp. 765-768 ◽  
Author(s):  
Kenneth E. Smith ◽  
C. W. Frank
Keyword(s):  
Organic Solvent ◽  
Alkaline Earth ◽  
Transition Metal Ions ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Solvent Water ◽  
Effect Of Solvents ◽  
Initial Stage ◽  
Absorption Characteristics

This study, investigating the absorption characteristics of arsenic, included the sensitivities of the resonance lines suitable for analytical use, interferences, and the effect of solvents on absorption. Of the lines investigated, three proved to be analytically useful: 1972 Å and 3944 Å (1972 Å second order) having sensitivities of 1 ppm and 1937 Å with a sensitivity of approximately 2 ppm. Interferences from alkali, alkaline earth, and transition-metal ions as well as several common anions were investigated at these three wavelengths. It was found that organic solvent—water mixtures generally enhanced the arsenic absorption. The initial stage of the study was the establishment of optimum operating conditions through manipulation of various parameters. At 1937 Å, and to a lesser degree at 1972 Å, problems were encountered stemming from increased scattering of radiation and absorption by molecular oxygen and acetylene.

scholarly journals Simultaneous Extraction of Lead, Copper, and Cadmium from Aqueous Solution using Emulsion Liquid Membrane Technique

2020 ◽  
Vol 13 (3) ◽  
pp. 183-188
Author(s):  
Hassan A. Shamkhia ◽  
Amer D. Z. Albdiria
Keyword(s):  
Aqueous Solution ◽  
Liquid Membrane ◽  
Operating Conditions ◽  
System Stability ◽  
Emulsion Liquid Membrane ◽  
Simultaneous Extraction ◽  
H2so4 Concentration ◽  
Membrane Technique ◽  
Span 80 ◽  
The Impact

A simultaneous extraction study of lead, copper, and cadmium from diluted aqueous solution through Emulsion Liquid Membrane (ELM) technique was conducted and extensive investigations of the impact    of the pH of the feed phase, homogenizer speed, surfactant (Span 80) and carrier (D2EHPA)           concentrations, and ratio of external to membrane phase on the system stability (breakage) and removal efficiencies of Pb2+, Cu2+,Cd2+ ions were experimentally carried out. Kerosene was used as the membrane and stabilized by Sorbitan monooleate (Span 80) as the emulsifier. Bis-2-Ethylhexyl phosphoric acid (D2EHPA) as an extractant and H2SO4 as a reagent (internal phase) were utilized. Lead, Copper, and Cadmium extraction efficiencies of 100%, 100%, and 98% were obtained respectively under specific operating conditions. The emulsion stability of the system was studied, and breakage of 1.8% under the best operating condition was obtained. High reagent (H2SO4) concentration (0.5 M) maintained the simultaneous extraction of the three heavy metals (lead, copper, and cadmium) and minimizes the probable interaction and competing mechanism between them in the extraction stage.

Sign in / Sign up

Export Citation Format

Share Document