Synthesis and application of p-tert-butylcalix[8]arene immobilized material for the removal of azo dyes

Kamboh, Muhammad Afzal; Solangi, Imam Bakhsh; Sherazi, Syed Tufail Hussain; Memon, Shahabuddin

doi:10.1016/j.jhazmat.2010.11.058

Cited by 56 publications

(27 citation statements)

References 42 publications

(47 reference statements)

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“…The average OII dye removal by BCP decreased from 99.5% to 79.9% when the solution pH increased from 3 to 8. The maximum adsorption of the OII dye was attained at pH 3 in accordance with previous reports [21–23]. The OII dye removal by BCP was significantly higher than the removal percentage achieved by the use of chitosan alone.…”

Section: Resultssupporting

confidence: 90%

Abatement of Azo Dye from Wastewater Using Bimetal‐Chitosan

Asgari

Ramavandi

Farjadfard

2013

The Scientific World Journal

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We introduce a new adsorbent, bimetallic chitosan particle (BCP) that is successfully synthesized and applied to remove the orange II dye from wastewater. The effects of pH, BCP quantity, and contact time are initially verified on the basis of the percentage of orange II removed from the wastewater. Experimental data reveal that the Cu/Mg bimetal and chitosan have a synergistic effect on the adsorption process of the adsorbate, where the dye adsorption by Cu/Mg bimetal, chitosan alone, and bimetal-chitosan is 10, 49, and 99.5%, respectively. The time required for the complete decolorization of orange II by 1 mg/L of BCP is 10 min. The Langmuir model is the best fit for the experimental data, which attains a maximum adsorption capacity of 384.6 mg/g. The consideration of the kinetic behavior indicates that the adsorption of orange II onto the BCP fits best with the pseudo-second-order and Elovich models. Further, the simulated azo dye wastewater can be effectively treated using a relatively low quantity of the adsorbent, 1 mg/L, within a short reaction time of 20 min. Overall, the use of BCP can be considered a promising method for eliminating the azo dye from wastewater effectively.

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Section: Resultssupporting

confidence: 90%

Abatement of Azo Dye from Wastewater Using Bimetal‐Chitosan

Asgari

Ramavandi

Farjadfard

2013

The Scientific World Journal

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“…the development of supramolecular chemistry has been made over the years by synthesizing calix(n]arene based macrocyclic compounds, especially in the field of separation science. Calixarene-based solid extracting materials generally provides swiftly and easy separation as well as recovery of contaminants from polluted environment (32)(33)(34)(35)(36). For that reason, variety of stylish appropriately designed chelating ligands bearing calixarene backbones have been reported as oxoanions receptors (35)(36)(37).…”

Section: Introductionmentioning

confidence: 99%

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

Memon

Bhatti

2014

Polycyclic Aromatic Compounds

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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.

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“…153 The works aiming to use calixarenes for construction of systems adsorbing gases such as hydrogen, 154 or methane, 155 are of interest in the field of energetics, and the development of these investigations is expected. A growing attention is paid today to a wide range of sensors, 156,157 as well as to removal of undesired compounds from industrial waste, [158][159][160] this research area being strongly connected with the environment protection.…”

Section: Resultsmentioning

confidence: 99%