Removal of chromium (VI) using activated carbon-supported-functionalized carbon nanotubes

Parlayıcı, Şerife; Eskizeybek, Volkan; Avcı, Ahmet; Pehlivan, Erol

doi:10.1007/s40097-015-0156-z

Cited by 92 publications

(44 citation statements)

References 29 publications

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“…The isotherms show that TC adsorption approached the equilibrium at low concentrations and much faster than CBZ and DS. Many models have been used to describe adsorption isotherm data [41], and the Langmuir model is widely used, which can provide the parameter of maximum adsorption capacity. The Langmuir model (q e =q m C e /(1/b+C e )) was used to describe the experimental data, and the fitting results and obtained parameters are presented in Fig.…”

Section: Adsorption Kinetics and Isothermsmentioning

confidence: 99%

Preparation of regenerable granular carbon nanotubes by a simple heating-filtration method for efficient removal of typical pharmaceuticals

Shan

Deng

Zhao

et al. 2016

Chemical Engineering Journal

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A simple and convenient method was used to prepare novel granular carbon nanotubes (CNTs) for enhanced adsorption of pharmaceuticals. By heating CNTs powder at 450 in air, followed by filtration, the obtained granular adsorbent exhibited high surface area and pore volume since the heating process produced some oxygen-containing functional groups on CNT surface, making CNTs more dispersible in the formation of granular cake. The porous granular CNTs not only had more available surfaces for adsorption but also were more easily separated from solution than pristine CNTs (p-CNTs) powder. This adsorbent exhibited relatively fast adsorption for carbamazepine (CBZ), tetracycline (TC) and diclofenac sodium (DS), and the maximum adsorption capacity on the granular CNTs was 369.5 mol/g for CBZ, 284.2 mol/g for TC and 203.1 mol/g for DS according to the Langmuir fitting, increasing by 42.4%, 37.8% and 38.0% in comparison with the pristine CNTs powder. Moreover, the spent granular CNTs were successfully regenerated at 400 in air without decreasing the adsorption capacity in five regeneration cycles. The adsorbed CBZ and DS were completely degraded, while the adsorbed TC was partially oxidized and the residual was favorable for the subsequent adsorption. This research develops an easy method to prepare and regenerate granular CNT adsorbent for the enhanced removal of organic pollutants from water or wastewater.

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Section: Adsorption Kinetics and Isothermsmentioning

confidence: 99%

Preparation of regenerable granular carbon nanotubes by a simple heating-filtration method for efficient removal of typical pharmaceuticals

Shan

Deng

Zhao

et al. 2016

Chemical Engineering Journal

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“…It is clear that Cr (VI) ions are better adsorbed to the N6,6/ GO and the composite has an adsorption capacity of 47.17 mg/ g. The Langmuir, Freundlich, Dubinin-Radushkevich, and Scatchard isotherms were used using Eqs. 1, 2, 3, and 4, respectively (Parlayıcı et al 2015). q max and K L were obtained from the slope and intercept of the plot of C e /q e versus C e shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Electrospinning of polymeric nanofiber (nylon 6,6/graphene oxide) for removal of Cr (VI): synthesis and adsorption studies

2019

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Polymer nanofibers are valuable materials that are of great importance because they are inexpensive and they display high strength. In this study, nylon-6,6 (N6,6)/graphene oxide (GO) nanofibers were developed and characterized. GO was synthesized from graphene using the known Hummer's method. GO is obtained by reaction of the graphene with strong oxidants and was characterized using Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The characterizations showed that the graphene was suitably oxidized. GO was added to N6,6 to produce N6,6/GO nanofibers at loadings of 0.5, 1.0, 1.5, and 2.0 wt% through the melt mixing method. The batch adsorption model for Cr (VI) adsorption was applied as a function of time, initial Cr (VI) concentration, adsorbent dosage, and pH to examine nanofiber activity. N6,6/GO a exhibited high adsorption capacity for Cr (VI) at pH 2.0. The maximum adsorption capacity for Cr (VI) ion was found to be 47.17 mg/g of N6.6/ GO using the related isotherm curves and equations. When the equilibrium data were examined, it was concluded that Langmuir adsorption isotherm was more suitable.

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“…Among these treatment methods, adsorption has been recognized as one of the most suitable and efficient method due to its great advantages, such as easy operation, high adsorption efficiency and low cost. Several adsorbents, like zeolites [11], carbon-based materials [12][13][14], activated alumina [15] etc., have been used for the removal of Cr(VI) from aqueous solutions. Recently, considerable attention for the removal of heavy metal ions from aqueous solutions has been paid to natural biosorbents such as chitosan.…”

Section: Investigation Of Adsorption Performance Of Chitosan For the mentioning

confidence: 99%

Investigation of adsorption performance of chitosan for the removal of hexavalent chromium from aqueous solutions

Egerić¹,

Stanković²,

Vujašin³

et al. 2019

Adv Techol

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Hexavalent chromium is a highly toxic pollutant that exists in industrial wastewater effluents. The efficient removal of Cr(VI) from these effluents before their discharging into the environment is of great importance. Biopolymer chitosan was used as an adsorbent for the removal of Cr(VI) ions from aqueous solutions. The adsorbent characterization was carried out by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Batch adsorption experiments were conducted to evaluate the effects of different parameters, such as contact time, solution pH, adsorbent dose, initial Cr(VI) concentration and ionic strength, on Cr(VI) removal. The obtained results revealed that the adsorption equilibrium was accomplished within 60 min. The adsorption was highly dependent on the solution pH and the maximum removal of Cr(VI) occured in the pH range 2.0-3.5. Analysis of kinetic parameters of Cr(VI) adsorption showed that pseudo-second order model described the kinetics for the investigated system. The data were fitted using two equilibrium adsorption models-Langmuir and Freundlich isotherm. The adsorption equilibrium data fit the Langmuir equation and the maximum adsorption capacity was found to be 91.4 mg g-1. The presence of co-existing anions at higher concentrations significantly reduced the removal of Cr(VI) by chitosan. According to the presented results, it can be concluded that biopolymer chitosan has a great potential for application in the treatment of chromium contaminated wastewaters.

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Removal of chromium (VI) using activated carbon-supported-functionalized carbon nanotubes

Cited by 92 publications

References 29 publications

Preparation of regenerable granular carbon nanotubes by a simple heating-filtration method for efficient removal of typical pharmaceuticals

Preparation of regenerable granular carbon nanotubes by a simple heating-filtration method for efficient removal of typical pharmaceuticals

Electrospinning of polymeric nanofiber (nylon 6,6/graphene oxide) for removal of Cr (VI): synthesis and adsorption studies

Investigation of adsorption performance of chitosan for the removal of hexavalent chromium from aqueous solutions

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