Exploration of Pb<sup>2+</sup>Selective Behavior of Calix[6]arene Ester Derivative

Solangi, Imam Bakhsh; Memon, Shahabuddin; Memon, Najma; Bhanger, M. I.

doi:10.1080/10601320802454151

Cited by 9 publications

(4 citation statements)

References 38 publications

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“…The interferences of other selected metal cations (Na þ , K þ , Cu 2þ and Mg 2þ ) on the Pb 2þ extraction ability of 1 was reported by our group (33). The results reveal that there is no significant effect of interfering metal cations except Na þ with a little effect on the extraction ability of 1.…”

Section: Selectivity Of Bulk Liquid Membrane Techniquesupporting

confidence: 52%

“…The selective extraction efficiency of calix [6]arene hexaester derivative (1) (shown in Fig. 1) for Pb(II) was recently reported by our group (33). Therefore, in the present work calix [6]arene skeleton was selected as a vehicle for modeling such phenomena involving Pb(II) transport through BLM.…”

Section: Kinetic Study Of An Effective Pb(ii) Transport Through a Bulmentioning

confidence: 82%

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

Minhas

Solangi

Memon

et al. 2010

Separation Science and Technology

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The article describes transport of Pb(II) through bulk liquid membrane (BLM) containing calix[6]arene hexaester derivative (1) as a carrier. The effect of various parameters such as temperature, carrier concentration, stirring speed and type of solvent on the Pb(II) transport efficiency of the carrier through BLM was evaluated. The activation energy values for the extraction and re-extraction were found as 56.33 kJ mol À1 and 14.79 kJ mol À1 , respectively. These values demonstrate that the process is diffusionally controlled by Pb(II). Observations indicate that the membrane entrance and exit rate constants (k 1 , k 2 ) increase with increasing stirring speed as well as carrier concentration and decrease with increasing temperature. The effect of solvent on k 1 and k 2 was found to be in the order of CH 2 Cl 2 > CHCl 3 > CCl 4 .

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Section: Selectivity Of Bulk Liquid Membrane Techniquesupporting

confidence: 52%

Section: Kinetic Study Of An Effective Pb(ii) Transport Through a Bulmentioning

confidence: 82%

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

Minhas

Solangi

Memon

et al. 2010

Separation Science and Technology

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“…Besides this, calix[n]arene derivatives comprising of ester functionality have been proved as excellent extractants for Pb 2+ ions [14,[38][39]. While others containing sulfur, nitrogen in thiolates, thioether, dithiocarbamates, urea and substituted thiourea functionalities show extracting ability toward transition and precious metals [40,41].…”

Section: Introductionmentioning

confidence: 99%

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

Bhatti

Solangi

Memon

2013

Desalination and Water Treatment

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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+ .

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“…It has been explored earlier that a calixarene with diester and/or dinitrile functionalities at its lower rim (narrow rim) can selectively extracts lead/mercury from an aqueous to the organic phase in liquid-liquid extraction processes [46]. Solangi et al have explored Pb 2+ selective extraction behavior of ester derivatives of calix[n]arenes [47]. They observed that the hexaester derivative of calix [6]arene is more selective and efficient ionophore as compared to tetraester derivative of calix [4]arene for the extraction of Pb 2+ from aqueous to the organic phase.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Studies of Synthesizing Novel Calix[4]arene Derivative as Host for Treatment of Toxic Metal Cations (Hg2+, Cd2+, Pb2+ and Ag+)

Rubaye¹

2015

J Phys Chem Biophys

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Novel calix[4]arene derivative containing mixed pendant arms in its lower rim, 25, 27-bis (diethylamino) ethoxy-26, 28-(bis-methoxyethoxy) calix[4]arene, L3, has been synthesized to target the heavy metal cations. 1 H NMR investigations seems to indicate that the receptor L3 interacts preferentially with Hg 2+ , Cd 2+ , Pb 2+ and Ag + in acetonitrile. Complexation studies in acetonitrile show that the lower rim groups of the receptor L3 are the active sites of its interaction with metal ions. These findings are corroborated by conductance measurements in acetonitrile, plots of molar conductance against the ligand/metal cation ratio reveal the formation of 1:1 complexes between this ligand with these cations. Standard thermodynamics parameters of complexation (log K s , ΔH ᵒ c , ΔS ᵒ c , ΔG ᵒ c) of L3 with Hg 2+ , Cd 2+ , Pb 2+ and Ag + in acetonitrile were determined using the Nano ITC (isothermal titration calorimetry). For all the systems investigated, the complexation process between these metal cations and the receptor L3 was enthalpically controlled. The enthalpic and entropic contributions to the Gibbs energy associated with these processes are analysed.

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Exploration of Pb²⁺Selective Behavior of Calix[6]arene Ester Derivative

Cited by 9 publications

References 38 publications

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

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

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

Fundamental Studies of Synthesizing Novel Calix[4]arene Derivative as Host for Treatment of Toxic Metal Cations (Hg2+, Cd2+, Pb2+ and Ag+)

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Exploration of Pb2+Selective Behavior of Calix[6]arene Ester Derivative

Cited by 9 publications

References 38 publications

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

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

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

Fundamental Studies of Synthesizing Novel Calix[4]arene Derivative as Host for Treatment of Toxic Metal Cations (Hg2+, Cd2+, Pb2+ and Ag+)

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Exploration of Pb²⁺Selective Behavior of Calix[6]arene Ester Derivative

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