Effect of gas sparging on the removal of heavy metal ions from industrial wastewater by a cementation technique

Zarraa, Mahmoud A.

doi:10.1016/0304-386x(92)90045-2

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…Table 2. The value of the mass transfer coefficient increased with increasing the concentration of copper ions which is in agreement with reported results [5]. This may be attributed to the formation of a rough porous deposit which increases the surface area and decreases the diffusion path length due to the formation of small eddies in the laminar boundary layer [3].…”

Section: +supporting

confidence: 80%

“…However, since actual yield and process efficiencies are determined by rate factors, the knowledge of the reaction kinetics is essential for the most economic utilization of the process. Factors affecting these kinetics, such as geometry of the less noble metal surface, temperature, concentration of the metal ions and mode of stirring velocity, have been studied extensively [3][4][5][6][7][8][9][10][11][12][13]. An electrochemical nature of the cementation reaction was recognized and this pictured cementation to occur through shorted electrochemical cells similar to the model proposed for aqueous corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Non-aqueous Solvents on the Rate of Production of Copper Powder from Copper Sulphate Solution by Cementation on Stationary Zinc Sheet and Rotating Zinc Cylinder

Taha

2004

Port. Electrochim. Acta

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The rate of copper II/zinc cementation from copper sulphate solutions in the absence and in the presence of methanol (CH 3 OH) and dimethyl sulphoxide (DMSO) has been studied and the reaction was found to follow first-order kinetics. The influence of several parameters on the course of the reaction, such as cylinder rotation speed, initial concentration of Cu 2+ ions, temperature and concentration of organic solvent, was investigated. In the case of CH 3 OH, rotating zinc cylinder was used, while in the presence of DMSO stationary zinc sheet and rotating zinc cylinder were used. It was found that (1) the percentage inhibition caused by methanol ranged from 10.70 to 58.38 depending on the concentration of the alcohol used; (2) the rate of cementation in the presence of DMSO using rotating zinc cylinder > the rate of cementation in the presence of DMSO using stationary zinc sheet; (3) the rate of cementation on zinc cylinder in the presence of DMSO < the rate of cementation in the presence of CH 3 OH. Different reaction conditions, and the physical properties of solutions are studied to obtain dimensionless correlation among all these parameters. Thermodynamic parameters ∆S*, ∆H* and ∆G* were studied.

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Section: +supporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Effect of Non-aqueous Solvents on the Rate of Production of Copper Powder from Copper Sulphate Solution by Cementation on Stationary Zinc Sheet and Rotating Zinc Cylinder

Taha

2004

Port. Electrochim. Acta

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“…To date, several techniques have been developed for such purpose, such as filtration, , flotation, cementation, solvent extraction, − reverse osmosis, coprecipitation, , and adsorption . Among them, adsorption is considered an effective method due to its high efficiency and convenience, and a number of polymeric materials have been developed as absorbents, such as chitosan, − cellulose, − polyethylene, − polyvinylalcohol, , and polysulfone .…”

Section: Introductionmentioning

confidence: 99%

Development of a Novel Hollow Fiber Cation-Exchange Membrane from Bromomethylated Poly(2,6-dimethyl-1,4-phenylene oxide) for Removal of Heavy-Metal Ions

Cheng

Wang

et al. 2010

Ind. Eng. Chem. Res.

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A novel hollow fiber cation-exchange membrane was prepared from a bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) hollow fiber by amination and sulfonation. The membrane exhibited good performance for adsorption of Cu 2+ , and its maximum capacity can reach 69.12 mg/g. In particular, the adsorption capacity increased with an increase in adsorption time, initial Cu 2+ concentration, and ion-exchange capacity of the membrane, and the adsorption isotherms were of Langmuir and Freundlich types. When these membranes were taken for desorption in solutions of hydrochloric acid, the regeneration ratio increased with an increase in regeneration time (before 20 min) and acid concentration. This study can provide new material for removal of heavy-metal ions in an energy-saving manner.

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Mass Transfer Characteristics during the Removal of Dissolved Heavy Metals from Waste Solutions in Gas Sparged Fluidized Beds of Ion Exchange Resins

Zarraa¹

1999

Chem. Eng. Technol.

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The paper presents experimental results concerning the removal of cupric ions from a simulated wastewater effluent consisting of copper sulphate solution in a gas sparged fluidized bed of cation exchange resin. Variables investigated were: superficial gas velocity, particle diameter, bed height and the physical properties of the solution (adding glycerol). These variables were studied with respect to their effect on the solid-liquid mass transfer coefficient. The coefficient was found to increase with increasing superficial gas velocity. Increasing both particle diameter and bed height were found to reduce the mass transfer coefficient. The experimental data can be correlated by the equation J = 0.68 (Fr Re ) ±0.143

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Effect of gas sparging on the removal of heavy metal ions from industrial wastewater by a cementation technique

Cited by 10 publications

References 15 publications

Effect of Non-aqueous Solvents on the Rate of Production of Copper Powder from Copper Sulphate Solution by Cementation on Stationary Zinc Sheet and Rotating Zinc Cylinder

Effect of Non-aqueous Solvents on the Rate of Production of Copper Powder from Copper Sulphate Solution by Cementation on Stationary Zinc Sheet and Rotating Zinc Cylinder

Development of a Novel Hollow Fiber Cation-Exchange Membrane from Bromomethylated Poly(2,6-dimethyl-1,4-phenylene oxide) for Removal of Heavy-Metal Ions

Mass Transfer Characteristics during the Removal of Dissolved Heavy Metals from Waste Solutions in Gas Sparged Fluidized Beds of Ion Exchange Resins

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