Synthesis and dichromate anion sorption of silica gel-immobilized calix[4]arenes

Bozkurt, Selahattin; Kocabaş, Erdal; Durmaz, Mustafa; Sirit, Abdulkadir

doi:10.1016/j.jhazmat.2008.10.096

Cited by 39 publications

(22 citation statements)

References 24 publications

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“…The 1 H NMR data showed that the synthesized compounds exist in the cone conformation. Liquid-liquid extraction experiments have been performed to evaluate the dichromate and phosphate anions extraction efficiency of both calix[4]arene bearing amide-pyridinium units (4-7) and the calix[4]arene derivative bearing aminomethyl pyridinium units (8,9). It was observed that, compounds 4-7 exhibited lower affinity toward phosphate ions than the calix[4]arene derivative bearing amine pyridinium units (8,9).…”

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confidence: 99%

“…Liquid-liquid extraction experiments have been performed to evaluate the dichromate and phosphate anions extraction efficiency of both calix[4]arene bearing amide-pyridinium units (4-7) and the calix[4]arene derivative bearing aminomethyl pyridinium units (8,9). It was observed that, compounds 4-7 exhibited lower affinity toward phosphate ions than the calix[4]arene derivative bearing amine pyridinium units (8,9). The extraction of phosphate and dichromate anions by these compounds indicates that the partially protonated pyridyl or amino groups play the major role for the formation of hydrogen bonds and electrostatic interactions.…”

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confidence: 99%

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

Ertul

Bayrakcı

2010

Journal of Hazardous Materials

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confidence: 99%

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confidence: 99%

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

Ertul

Bayrakcı

2010

Journal of Hazardous Materials

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“…complexation by the calix [4]arene units [38]. To probe this possibility, the levels of residual Na ?…”

Section: Resultsmentioning

confidence: 99%

Immobilization of novel the semicarbazone derivatives of calix[4]arene onto magnetite nanoparticles for removal of Cr(VI) ion

Akoz

Erdemir

2011

J Incl Phenom Macrocycl Chem

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A series of novel the semicarbazone derivatives of calix [4]arene have been synthesized and then immobilized onto amino functionalized magnetic nanoparticles. Magnetic Fe 3 O 4 nanoparticles were prepared by the chemical co-precipitation of Fe(III) and Fe(II) ions and the nanoparticles were modified directly by 3-aminopropyltriethoxy silane (APTES) to introduce reactive amine groups onto the particles' surface. The characterization of the prepared compounds was made by FT-IR, elemental analysis, TGA/DTG and NMR techniques. The sorption properties of the new calix[4]arene based magnetic sorbents toward Cr(VI) ion were also studied. The results showed that the prepared magnetic nanoparticles were effective sorbents for the removal of Cr(VI) ion. Also, Langmuir and Freundlich isotherm models were applied for Cr(VI) ion sorption by using MN-C2 and it was found that the experimental data confirmed to Langmiur isotherm model.

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“…2). Three grams (0.050 mol) of silicon dioxide (substrate), previously activated at 1508C for 4 h, were suspended in anhydrous toluene and were added to 7.70 g (0.043 mol) of AMPS 10% in anhydrous toluene [25,26]. This reagent binds to the free silanols of the substrate.…”

Section: Synthetic Preparation Of the New Silica Derivativementioning

confidence: 99%

New SPE loading material for affinity‐based separation of cyclodextrins from drug:CD complexes in order to overcome Beer's law deviations

Rozou

Raftopoulos

Hatziantoniou

et al. 2009

J of Separation Science

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Molecular inclusion of guest molecules within CDs is known to alter guest molecule spectrophotometric absorptivity, making their determination, based on spectrophotometric data, inaccurate. Therefore specific analytical methods capable of quantifying the drugs as free molecules must be developed and validated. SPE was selected to simplify sample and avoid more time-consuming alternatives. A new solid phase was synthesized and characterized by infrared spectrometry, differential scanning calorimetry and elemental analysis. The competitive complexation of adamantane groups immobilized on the silica substrate facilitates drug:CD complex dissociation and elimination of CD from samples. The drug molecules, now free from CD, can be easily analysed by an already available HPLC method. This new SPE loading material was employed in the determination of ketoprofen in its CD complex as a representative example of the utility of this novel material. The calculated analytical errors were reduced from a maximum of 20.79% (without SPE) to a minimum of 3.99%.

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Synthesis and dichromate anion sorption of silica gel-immobilized calix[4]arenes

Cited by 39 publications

References 24 publications

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

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

Immobilization of novel the semicarbazone derivatives of calix[4]arene onto magnetite nanoparticles for removal of Cr(VI) ion

New SPE loading material for affinity‐based separation of cyclodextrins from drug:CD complexes in order to overcome Beer's law deviations

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