Author
E. J. Chou
Bio: E. J. Chou is an academic researcher from New York University. The author has contributed to research in topics: Aqueous solution & Trinitrotoluene. The author has an hindex of 4, co-authored 5 publications receiving 28 citations.
Papers
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TL;DR: In this article, a surfactant which was specifically designed to chelate with these ions was used for the removal of cadmium and copper ions from aqueous solution, and the relationship between the formation constants and surface tensions of solutions of Cd-and Cu-surfactant complexes was discussed.
Abstract: Foam separation techniques for the removal of cadmium and copper ions from aqueous solution were studied by employing a surfactant which was specifically designed to chelate with these ions. Relationships between the formation constants and surface tensions of solutions of Cd- and Cu-surfactant complexes on the selectivity of the removal of these ions were discussed.
9 citations
Patent•
18 Oct 1976TL;DR: In this paper, the authors provided a process for removing trinitrotoluene from waste water resulting from the manufacture of trinitronitriroltroluene, the process comprising forming an admixture of the waste water and an amino group containing compound of the formula (Cn H2n+1)m (NH(CH2)x)y NHz, wherein n is 1 to 25, m is 1-3, x is 1to 5, y is 0 to 5, z 0 to 2 or the amine and a cationic
Abstract: There is provided a process for removing trinitrotoluene from waste water resulting from the manufacture of trinitrotoluene, the process comprising forming an admixture of the waste water and an amino group containing compound of the formula (Cn H2n+1)m (NH(CH2)x)y NHz, wherein n is 1 to 25, m is 1 to 3, x is 1 to 5, y is 0 to 5, z is 0 to 2 or the amine and a cationic compound of the formula (Cn H2n+1)4 N+ X-, wherein n is 1 to 25, and X- is Cl-, Br-, SO4 H- ; stirring the mixture to form a water insoluble reaction product of trinitrotoluene, and recovering the reaction product from the substantially trinitrotoluene free waste water.
7 citations
TL;DR: In this article, the rate of removal of cadmium, copper, and nickel ions from aqueous solution by foam fractionation has been studied using a chelating surfactant, 4-dodecyl-diethylenetriamine.
Abstract: Removal of cadmium, copper, and nickel ions from aqueous solution by foam fractionation has been studied using a chelating surfactant, 4-dodecyl-diethylenetriamine. The rate of removal is a function of concentration of both metallic ions and surfactant. In the low concentration range for the metallic ions compared to that of the surfactant, the order of removal was found to be Cd2+ > Ni2+ > Cu2+. However, at higher concentrations of ions, the order becomes inverse, Cu2+ > Ni2+ > Cd2+. A selectivity coefficient for the separation of a specified ion from one or more ions using a chelating surfactant is shown to be dependent on the surface tension of the complex and the chelation constants. The relationship between separation selectivity of the removal of the metallic ions and concentration of both surfactant and metallic ions is discussed
6 citations
5 citations
01 Oct 1977
Abstract: : 2,4,6-Trinitrotoluene (TNT) has contaminated the wastewater emanating from plants engaged in not only the manufacture but also the loading, assembling and packing of TNT. It has been found that certain surfactants containing amino groups reacted rapidly with TNT in aqueous solution. The reaction product was a dark brown material which was insoluble in water. When the initial concentration of TNT was in the range of 120-140 ppm, after reacting with surfactant the TNT concentration in the filtrate was found to be at trace levels. Thus, this reaction was developed for the purification of wastewater containing TNT. The reaction mechanisms of the process is discussed. (Author)
1 citations
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TL;DR: Ion flotation has a long history for laboratory-scale metal separations, and has been tested at the pilot scale for recovering gold from leach solutions as mentioned in this paper, but it has not yet been adopted in commercial hydrometallurgical operations.
107 citations
TL;DR: In this article, a multistage foam fractionation in a bubble-cap trayed column was investigated with one to four stages operated in steady-state mode for surfactant concentrations less than the critical micelle concentration (CMC).
100 citations
TL;DR: The effect of a neutral chelating ligand, triethylenetetraamine (Trien), on the ion flotation of cations with dodecylsulfate, DS(-), introduced as sodium dodECyls sulfurate, SDS, shows promise for removing toxic heavy metal ions from dilute aqueous solutions.
79 citations
TL;DR: In this paper, a simple continuous mode foam fractionation was used and three surfactants were studied (two anionic and one cationic) The effects of air flow rate, foam height, liquid height, and liquid feed surfactant concentration, and sparger porosity were studied.
Abstract: The purpose of this study was to investigate the use of foam fractionation to recover surfactant from water A simple continuous mode foam fractionation was used and three surfactants were studied (two anionic and one cationic) The effects of air flow rate, foam height, liquid height, liquid feed surfactant concentration, and sparger porosity were studied This technique was shown to be effective in either surfactant recovery or the reduction of surfactant concentration in water to acceptable levels As an example of the effectiveness of this technique, the cetylpyridinium chloride concentration in water can be reduced by 90% in one stage with a liquid residence time of 375 minutes The surfactant concentration in the collapsed foam is 215 times the feed concentration This cationic surfactant was easier to remove from water by foam fractionation than the anionic surfactants studied
75 citations