Removal of chromate and phosphate anion from aqueous solutions using calix[4]aren receptors containing proton switchable units

Ertul, Şeref; Bayrakcı, Mevlüt

doi:10.1016/j.jhazmat.2010.05.121

Cited by 31 publications

(16 citation statements)

References 33 publications

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“…Better extraction results were obtained with compound 9 which extracted the dichromate anions more efficiently as compared to compound 7 and monoamide derivatives 5 and 6 . This situation shows that calixarene derivatives containing protonable amine binding sites are more powerful extractants and this situation, which is in accordance with the literature 29–31. Based on the results, it is concluded that calix[4]arene unit plays an important role in confirming the cooperative participation of the functional groups.…”

Section: Resultssupporting

confidence: 90%

Synthesis of novel silica gel immobilized‐calix[4]arene amide ionophores and their anion binding abilities toward phosphate and chromate anions

Yiğiter

Bayrakcı

Ertul

2011

J of Applied Polymer Sci

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This article describes the synthesis and characterization of four new calix[4]arene ionophores 5-7 and 9 and corresponding two new silica gel-immobilized calix[4]arene ionophores containing pyridine 10 and 11 via modification of calix[4]arene monoamide derivatives 5 and 6 with aminopropyl silica gel, respectively. The extraction studies have been performed using liquid-liquid extraction for receptors 5-7 and 9 and solid-liquid batchwise sorption procedures for receptors 10 and 11. Obtained extraction results showed that the immobilized-calix[4] arene ionophores 10 and 11 have high extraction ability toward chromate and phosphate anions as compared to their corresponding monomeric precursors 5 and 6.

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Section: Resultssupporting

confidence: 90%

Synthesis of novel silica gel immobilized‐calix[4]arene amide ionophores and their anion binding abilities toward phosphate and chromate anions

Yiğiter

Bayrakcı

Ertul

2011

J of Applied Polymer Sci

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“…In this regard, supramolecular chemistry has offered more a effective solution to determine molecular structures that can serve as building blocks for the production of sophisticated molecules by anchoring functional groups in a manner that they offer an appropriate binding site. This was brought about by the creation of macrocyclic molecules, including synthetic crown ethers, cryptands, spherands [18], natural cyclodextrins [19] and calixarenes [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Tributyltin Adsorption onto Mesoporous Silica Functionalized with Calix[4]arene, p-tert-Butylcalix[4]arene and p-Sulfonatocalix[4]arene

2014

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Abstract:The adsorption of tributyltin (TBT), onto three mesoporous silica adsorbents functionalized with calix [4]arene, p-tert-butylcalix[4]arene and p-sulfonatocalix [4]arene (MCM-TDI-C4, MCM-TDI-PC4 and MCM-TDI-C4S, respectively) has been compared. Batch adsorption experiments were carried out and the effect of contact time, initial TBT concentration, pH and temperature were studied. The Koble-Corrigan isotherm was the most suitable for data fitting. Based on a Langmuir isotherm model, the maximum adsorption capacities were 12.1212, 16.4204 and 7.5757 mg/g for MCM-TDI-C4, MCM-TDI-PC4 and MCM-TDI-C4S, respectively. The larger uptake and stronger affinity of MCM-TDI-PC4 than MCM-TDI-C4 and MCM-TDI-C4S probably results from van der Waals interactions and the pore size distribution of MCM-TDI-PC4. Gibbs free energies for the three adsorption processes of TBT presented a negative value, reflecting that TBT/surface interactions are thermodynamic favorable and spontaneous. The interaction processes were accompanied by an increase of entropy value for MCM-TDI-C4 and MCM-TDI-C4S (43.7192 and 120.7609 J/mol K, respectively) and a decrease for MCM-TDI-PC4 (−37.4704 J/mol K). It is obviously observed that MCM-TDI-PC4 spontaneously adsorbs TBT driven mainly by enthalpy change, while MCM-TDI-C4 and MCM-TDI-C4S do so driven mainly by entropy changes.

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“…To mitigate the adverse effects of P, an appropriate removal technology is required. A wide range of physical and chemical processes is available to eliminate Cr (VI) and P from wastewater, such as: liquid-liquid extraction, hybrid anion exchange-precipitation, 10,18,19 and adsorption. 7,16 Among these potential separation technologies, adsorption is one of the most promising because of its initially low cost, flexibility, and ease of operation.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Adsorption of Chromium (VI) and Phosphate by Calcined Mg-Al-CO₃Layered Double Hydroxides

Song¹,

Wu²

2014

Bulletin of the Korean Chemical Society

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The adsorption characteristics of chromium (VI) and phosphate on calcined Mg-Al-CO 3 layered double hydroxides (CLDH) were investigated in single and binary systems. A series of batch experiments were performed to study the influence of various experimental parameters. In this study, CLDH exhibited a high adsorption capacity for Cr (VI) and P in a single system. The experimental data were close to the theoretical adsorption capacity given by the Langmuir isotherm, the calculating adsorption capacities of Cr (VI) and P were up to 70.42 mg/g and 97.09 mg/g, respectively. It was found that the initial pH was approximately 6 and it took 24 h to reach equilibrium when P and Cr (VI) were added simultaneously. The experimental data were best fitted by a pseudo-second-order kinetics model. Competitive adsorption between Cr (VI) and P existed in the binary system. The presence of Cr (VI) had no significant influence on P adsorption. However, the suppression of Cr (VI) adsorption was obvious when the initial concentration of P was up to 10 mg/L with a concentration of 0.5 g/L of CLDH.

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Removal of chromate and phosphate anion from aqueous solutions using calix[4]aren receptors containing proton switchable units

Cited by 31 publications

References 33 publications

Synthesis of novel silica gel immobilized‐calix[4]arene amide ionophores and their anion binding abilities toward phosphate and chromate anions

Synthesis of novel silica gel immobilized‐calix[4]arene amide ionophores and their anion binding abilities toward phosphate and chromate anions

Comparative Study of Tributyltin Adsorption onto Mesoporous Silica Functionalized with Calix[4]arene, p-tert-Butylcalix[4]arene and p-Sulfonatocalix[4]arene

Simultaneous Adsorption of Chromium (VI) and Phosphate by Calcined Mg-Al-CO₃Layered Double Hydroxides

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Removal of chromate and phosphate anion from aqueous solutions using calix[4]aren receptors containing proton switchable units

Cited by 31 publications

References 33 publications

Synthesis of novel silica gel immobilized‐calix[4]arene amide ionophores and their anion binding abilities toward phosphate and chromate anions

Synthesis of novel silica gel immobilized‐calix[4]arene amide ionophores and their anion binding abilities toward phosphate and chromate anions

Comparative Study of Tributyltin Adsorption onto Mesoporous Silica Functionalized with Calix[4]arene, p-tert-Butylcalix[4]arene and p-Sulfonatocalix[4]arene

Simultaneous Adsorption of Chromium (VI) and Phosphate by Calcined Mg-Al-CO3Layered Double Hydroxides

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Simultaneous Adsorption of Chromium (VI) and Phosphate by Calcined Mg-Al-CO₃Layered Double Hydroxides