Kinetic Study of an Effective Pb(II) Transport through a Bulk Liquid Membrane Containing Calix[6]arene Hexaester Derivative as a Carrier

Separation Science and Technology

et al. 2011

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A bulk liquid membrane (BLM) experiment was carried out to check the Cu(II) transport efficiency of p-morpholinomethylcalix[4]-arene (1) which was used as carrier. Liquid=liquid extraction experiments were also carried out to check the extraction and decomplexation efficiency of carrier 1. It has been observed that the maximum amount of Cu(II) was transported at pH ¼ 12. The mass transfer of Cu(II) was analyzed on the basis of kinetic laws of two consecutive irreversible first order reactions. Thus, the kinetic parameters studied for the transport of Cu(II) were k 1 , k 2 , R max m ; t max ; J max d ; J max a . BLM study revealed that Cu(II) transport increase with increase in concentration of carrier 1 from 1 Â 10 À5 to 1 Â 10 À4 M, rise in temperature from 298 to 308 K and at high stirring speed from 90 to 800 rpm. The effect of binary solvents on Cu(II) transport through BLM has also been studied. The values of k 1 , k 2 , J max d ; and J max a decrease in the order of dichloromethanehexane > dichloromethane-diethylether > dichloromethane > dichlorodichloromethane-ethylacetate > chloroform. However, dichloromethane was proved as a stable BLM solvent. The activation energy value for the extraction and re-extraction was found as 31.52 and 8.08 kJmol À1 , respectively. These values demonstrate that Cu(II) transport is a diffusion controlled process. Thus, 1 was found to be an efficient carrier for Cu(II) transport through BLM.

Section: Effect Of Carrier Concentration On Cu(ii) Transportsupporting

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Calix[4]arene Derivative as Copper(II) Carrier in a Bulk Liquid Membrane: A Kinetic Study

Minhas

Qureshi

Separation Science and Technology

et al. 2011

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“…Thus, the vulnerability invoked by both arsenate and chromate emphasize the importance of those processes which not only remove these species from aqueous environment but also reduce or eliminate their bioavailability. In pursuance for the purification of aqueous media a number of techniques were explored including electro coagulation, nanofiltration (18) reverse osmosis (19), Downloaded by [University of Montana] at 11:04 06 April 2015 activated mud (20), ferrihydrite crystallization process (21), solvent extraction, ion exchange, electro-deposition, precipitation/coagulation technique and sorption (22)(23)(24). Among these methods, due to low cost, flexibility, and simplicity of design, convenient to operate and avoid the formation of toxic secondary pollutants.…”

Section: Introductionmentioning

confidence: 99%

Arsenate and Dichromate Removal Efficiency of a New Calix[4]arene Impregnated Resin

Polycyclic Aromatic Compounds

Bhatti

2014

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This article highlights a newly synthesized 5,11,17,23-tetra-tert.butyl-25,26,27,28-tetrakis(hydrazidecarbonylmethoxy)-calix[4]arene (3) impregnated resin 4 and it's sorption ability for the removal of selected oxoanions, i.e., (arsenate and dichromate) from aqueous environment. Resin 4 was characterized by using FT-IR spectroscopy, scanning electron microscope (SEM), elemental, and thermogravimetic (TGA) analyses techniques. Sorption study was carried out through static and dynamic methods with continuous flow operation to evaluate the potency of resin 4 under various conditions. Several parameters, such as effect of sorbent dosage, contact time, pH, and initial concentration were optimized through batch experiments. Results justify that % sorption of these oxoanions is highly dependent on pH of the solution. Equilibrium was achieved in 45 min, while sorption efficiency of resin 4 can be better explained by Langmuir and Temkin isotherm models. Furthermore, kinetically both oxoanions follow pseudo second order model. Additionally, sorption of arsenate more appropriately could be explained by Moris-Weber diffusion kinetic model. For the dynamic method, Thomas model was used to calculate the kinetic coefficient (k TH ) and maximum sorption capacity (q o ) of resin 4 which are 3.84 and 5.94 ml mg −1 min −1 and 0.185, 0.160 mg g −1 for As (V) and Cr (VI) respectively. Furthermore, resin 4 has been found as potential sorbent for removal of these oxoanions from contaminated surface water samples.

“…The WHO permissible limit for Pb 2+ in drinking water is 0.01 mg/L [8]. However, the excessive Pb 2+ exposure may cause brain damage and dysfunction of kidneys, liver, and central nervous system in humans, headache, convulsions, behavioral disorders, and constipation and potentially can cause cancer from a lifetime exposure above the action level [9,10] 51 (2013) 4666-4674 June adopted for the removal of toxic metal ions including chemical precipitation, coagulation/flocculation, ion exchange, solvent extraction, cementation, complexation, electrochemical operations, biological operations, evaporation, filtration, adsorption and membrane processes [11][12][13][14][15]. Among all these methods, adsorption has got significant advantages such as cost effectiveness, simple operation and environmental friendly approach [16,17].…”

Section: Introductionmentioning

confidence: 99%

Pb²⁺adsorption behavior of calix[4]arene based Merrifield Resin

Bhatti

Solangi

Desalination and Water Treatment

2013

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A B S T R A C TThe present study reveals the adsorption of heavy metals, especially Pb 2+ from aqueous media by p-tetrathioureacalix[4]arene based Merrifield resin (1). The adsorption behavior of toxic Pb 2+ metal was evaluated through batch experiments and various parameters such as dosage, concentration and temperature were optimized. From the kinetic study, it has been noticed that adsorption mechanism follows pseudo-second order kinetic model. In addition, thermodynamic constants of adsorption phenomena for Pb 2+ was found to be DH = 0.098 kJ/ mol and DS = 0.339 kJ/mol, the positive value of DH suggest endothermic nature and spontaneity of process estimated by negative value of DG. The experimental data was carried out by applying different isotherm equations such as Freundlich, Langmuir, and Dubinin-Radushkevich, (D-R). From the analysis it could be clearly understood that Pb 2+ has been adsorbed chemically onto the surface of resin (1).In this view, calix[4]arene based resin (1) is very potential in minimize the risk of environmental water pollution by Pb 2+ .