Synthesis and properties of hydrophilic polymers. Part 7. Preparation, characterization and metal complexation of carboxy-functional polyesters based on poly(ethylene glycol)

Tülü, Metin; Geckeler, K. E.

doi:10.1002/(sici)1097-0126(199909)48:9<909::aid-pi244>3.0.co;2-e

Cited by 35 publications

(9 citation statements)

References 13 publications

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“…Possible carboxylic protons could not be observed due to a dimerization effect due to H bonding betwen the carboxylic acids. However amidic protons at 4.09 ppm, dendritic protons at 1.85 and 3.69 ppm respectively, and repeating units protons of PEG at 2.19 ppm were correlated with previous studies [14][15][16]. 1 H NMR spectra of PEG-HA…”

Section: Resultsmentioning

confidence: 99%

Synthesis and proton conductivity of anhydrous dendritic electrolytes

2007

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Water soluble PEG cored dendritic hexa-acid which comprises peripheral carboxylic acidic groups were prepared via nucleophilic substitution reactions. Novel anhydrous proton conducting electrolytes were prepared by incorporation of the heterocyclic protogenic solvent imidazole (Im) into PEG cored dendritic hexa acid, (PEG-HA), at several molar ratios of Im to -COOH units of PEG-HA. The complexation of PEG-HA and Im was illustrated by infrared spectroscopy (FT-IR). The materials are thermally stable up to 150• C as evidenced by thermogravimetry analysis (TGA). Differential scanning calorimetry (DSC) results verified that the organic electrolytes are homogeneous and amorphous. The proton conductivities were characterized by means of AC impedance spectroscopy and a maximum conductivity of 1 × 10 −3 S/cm was measured at 120• C in the anhydrous state.

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Section: Resultsmentioning

confidence: 99%

Synthesis and proton conductivity of anhydrous dendritic electrolytes

2007

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“…In the second step, dispersion of 2.0 g synthesized β-CD-CS was carried out in 50 mL of acetic acid (10%). Meanwhile, 15 g EDTA dianhydride synthesized by a previously reported method 44 was suspended in methanol. Then, both solutions were mixed at room temperature vigorously for 20 h. Thereafter, the solution was filtered and washed with 1.0 M NaOH to remove excess EDTA dianhydride.…”

Section: Materials and Methodsmentioning

confidence: 99%

Simultaneous Removal of Heavy Metals and Ciprofloxacin Micropollutants from Wastewater Using Ethylenediaminetetraacetic Acid-Functionalized β-Cyclodextrin-Chitosan Adsorbent

et al. 2021

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The current study pertains to the synthesis of an EDTA-functionalized β-cyclodextrin-chitosan (β-CD-CS-EDTA) composite via a two-step process for the adsorptive removal of toxic heavy metallic ions (i.e., Pb(II), Cu(II), and Ni(II)) and antibiotic micropollutant, i.e., ciprofloxacin (CIP), from water. Different batch adsorption experiments such as pH, reaction time and initial pollutant concentration effects were carried out to identify the adsorption condition to attain the maximum removal efficiency. Kinetics results fit well with the pseudo-second order (PSO) kinetics model for both inorganic and organic pollutants. However, adsorption of heavy metal ions to the adsorbent was faster than that of CIP. Isotherms results showed excellent monolayer adsorption capacities of 330.90, 161, and 118.90 mg g –1 for Pb(II), Cu(II), and Ni(II), respectively, with a heterogeneous adsorption capacity of 25.40 mg g –1 for CIP. The adsorption mechanism was investigated using energy dispersive X-ray (EDX), elemental mapping, and Fourier transform infrared (FTIR) techniques. More significantly, the synthesized adsorbent gave good removal efficiencies when it was applied to simultaneously adsorb metal ions and CIP from real wastewater. Furthermore, excellent reusability could be obtained, making it a viable alternative to remove the inorganic and organic micropollutants for wastewater treatment.

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“…DTPAD was synthesized according to the method reported previously by Tülü et al 32 as shown in Fig. 1(B) .…”

Section: Methodsmentioning

confidence: 99%

“…2.3 Synthesis of Pt catalyst loaded on DTPA-functionalized silica gel (SiO 2 -DTPA-Pt) 2.3.1 Synthesis of DTPAD. DTPAD was synthesized according to the method reported previously by Tülü et al 32 as shown in Fig. 1(B).…”

Section: Instrumentsmentioning

confidence: 99%