The study of thermodynamics and kinetics methyl orange and malachite green by SWCNTs, SWCNT-COOH and SWCNT-NH2 as adsorbents from aqueous solution

Derakhshan, Mania Setareh; Moradi, Omid

doi:10.1016/j.jiec.2013.11.064

Cited by 89 publications

(15 citation statements)

References 29 publications

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“…Efficiency of conventional adsorbents is usually limited by the surface area or active sites, the lack of selectivity, and the adsorption kinetics [41]. CNT adsorbents offer significant improvement with their extremely high specific surface area and associated sorption sites, short intraparticle diffusion distance, and tunable pore size and surface chemistry [42]. In addition, CNTs can be considered as one of the most promising absorbents for this purpose because of their large adsorption capacity for synthetic dyes [5].…”

Section: Adsorption Of Synthetic Dyes On Cnts and A Comparison With Amentioning

confidence: 99%

A comparative study on the basis of adsorption capacity between CNTs and activated carbon as adsorbents for removal of noxious synthetic dyes: a review

et al. 2015

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Rapid removal of noxious synthetic dyes from wastewater is of great concern in the scientific research field, this is due to the expansion of harmful effects of synthetic dyes traces in water streams on the environment and human health with the exponential rise in concentration of synthetic dye globally and demand in various industries that coincided with the implantation of more stringent water quality standards. Various technologies have been applied for the removal of synthetic dye from wastewater, including adsorption technology, which has a great potential in treating varieties of synthetic dyes. This article comprehensively reviews the latest progress in the development of carbon nanotubes (CNTs) and their applications for the removal of synthetic dyes from wastewater, including functionalized of CNTs and their researched counterparts. The emerging trends in the development of alternative adsorbents with different substrates, morphologies, and functional groups are also elucidated.

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Section: Adsorption Of Synthetic Dyes On Cnts and A Comparison With Amentioning

confidence: 99%

A comparative study on the basis of adsorption capacity between CNTs and activated carbon as adsorbents for removal of noxious synthetic dyes: a review

et al. 2015

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“…The removal capacity of Pb(II) ion by GO, GO-SH 1 , GO-SH 2 , and GO-SH 3 adsorbents, simulated by the four linear types of Langmuir [31], the Freundlich [32], the Temkin [33], the Halsey [34], and the Dubinin-Radushkevich (D-R) [35] isotherm models. Also, the models were evaluated by the adjusted determination factor (R 2 adj); in addition, to estimate the fitness of isotherm equations to the experimental data, the chi-square statistic (X 2 ) was used to measure the isotherm constants [36].…”

Section: Adsorption Isothermmentioning

confidence: 99%

Removal of Pb(II) ion from aqueous solution by graphene oxide and functionalized graphene oxide-thiol: effect of cysteamine concentration on the bonding constant

Yari

Norouzi

Mahvi

et al. 2016

Desalination and Water Treatment

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2015): Removal of Pb(II) ion from aqueous solution by graphene oxide and functionalized graphene oxide-thiol: effect of cysteamine concentration on the bonding constant, Desalination and Water Treatment, A B S T R A C TEfficient adsorbent graphene oxide (GO) and its derivative, i.e., thiol-functionalized graphene oxide (GO-SH), was used for the removal of noxious Pb(II) ion from the aqueous phase. Different amounts, i.e., 60, 80, and 100 mg of cysteamine, were used as functionalizing agent to functionalize the GO with thiol group; hence, three different nanocomposites, i.e., GO-SH 1 , GO-SH 2 , and GO-SH 3 were prepared from the different amount of the cysteamine. The developed nanocomposites were characterized using various analytical techniques such as Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction analysis. The whole removal and adsorption process was well illustrated and investigated. The impact of influential factors including initial concentration, pH, contact time, temperature, and concentrations cysteamine on the adsorption properties of Pb(II) from aqueous solution was well elucidated and optimized. The obtained equilibrium results were inserted in various adsorption isotherm models such as Langmuir (liner types I, II, III, and IV), Freundlich, Temkin, Helsey, and Dubinin-Radushkevich isotherms, it was found that the Langmuir (type I) model demonstrated was well fitted and in good agreement with the maximum adsorption of Pb(II) ion from aqueous solution. Thermodynamic functions, such as ΔG˚, ΔH˚, and ΔSẘ ere calculated and it reveals that the adsorption of Pb(II) ion on all the surfaces was spontaneous and endothermic in nature.

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“…LMG excretes very slow (t 1/2 ~ 40 days) in certain fatty tissues and this causes the accumulation of LMG in fishes [8]. In addition, MG can cause harm to the aquatic environment; in a way, it is reducing light penetration and photosynthesis [9,10]. The disposal of dye wastewater without proper treatment is a big challenge since most of the dyes are difficult to eliminate from the environment and dyes are usually hard to biodegrade due to their complex molecular structures [11].…”

Section: Introductionmentioning

confidence: 99%

“…Chemical techniques such as advanced oxidation process consumed more chemical reagent while high cost of chemicals and operation brought about this method as an unattractive option. Meanwhile, biological methods, which include microbial degradation, bioremediation system and fungal discoloration, do not usually achieve a satisfactory elimination of the dyes on a continuous basis and require longer time [9,12]. Adsorption, which is one of the physical techniques for wastewater treatment, becomes an appealing method in the removal of dyes from wastewater since it offers a simple and easy design, does not contribute to harmful substances, has high efficiency and versatile techniques compared to the others [13].…”

Section: Introductionmentioning

confidence: 99%

Removal of Malachite Green Dye From Aqueous Solution Using Multi-Walled Carbon Nanotubes: An Application of Experimental Design

Zulkepli¹,

Abdullah²,

Khalik³

2016

MJAS

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An experimental design methodology was performed in the optimization of removal of malachite green dye by multi-walled carbon nanotubes. A Central Composite Design (2 5 ) was chosen to develop a mathematical model and determine the optimum condition for adsorption of malachite green by carbon nanotubes. Five experimental factors, namely initial dye concentration, mass of adsorbent, pH, contact time and agitation speed were studied. Maximum adsorption of malachite green was achieved at the suggested optimum conditions: initial dye concentration (20 ppm), weight of adsorbent (0.03 g), pH solution (7) contact time (17 min) and agitation speed (150 strokes per min). The experimental value of adsorption by multi-walled carbon nanotubes were found to be in good agreement with the predicted value (R 2 = 0.922).The experimental equilibrium data were best fitted to isotherm model (Langmuir) and kinetic model (pseudo second-order) respectively. Maximum adsorption by carbon nanotubes at monolayer for malachite green was obtained at 112.36 mg/g while kinetic rate constant was calculated to be 0.0017 g mg -1 min -1 .Keywords: carbon nanotubes, adsorption, malachite green, experimental design Abstrak Metodologi reka bentuk eksperimen telah dijalankan dalam pengoptimuman penyingkiran pewarna malakit hijau oleh karbon tiub nano multi-dinding. Reka bentuk komposit berpusat (2 5 ) telah dipilih untuk membentuk satu model matematik dan menentukan kondisi yang optima untuk penjerapan malakit hijau oleh karbon tiub nano. Lima faktor eksperimen yang terdiri daripada kepekatan awal pewarna, berat bahan penjerap, pH larutan, masa sentuhan dan kelajuan goncangan telah dikaji. Malakit hijau telah mencapai penjerapan yang optima oleh karbon tiub nano pada kondisi: kepekatan awal pewarna (20 ppm), berat bahan penjerap (0.03 g), pH larutan (7), masa sentuhan (17 minit) dan kelajuan goncangan (150 strok/minit). Nilai eksperimen untuk penjerapan oleh karbon tiub nano multi-dinding telah mencapai persetujuan yang baik pada nilai jangkaan (R 2 = 0.922). Data eksprimen keseimbangan menunjukkan kesesuaian pada model Langmuir dan model pseudo tertib kedua. Penjerapan maksimum oleh karbon tiub nano pada monolapisan untuk malakit hijau ialah 112.36 mg/g manakala pemalar kadar kinetik ialah 0.0017 g mg -1 min -1 .Kata kunci: karbon tiub nano, penjerapan, malakit hijau, reka bentuk eksperimen

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The study of thermodynamics and kinetics methyl orange and malachite green by SWCNTs, SWCNT-COOH and SWCNT-NH2 as adsorbents from aqueous solution

Cited by 89 publications

References 29 publications

A comparative study on the basis of adsorption capacity between CNTs and activated carbon as adsorbents for removal of noxious synthetic dyes: a review

A comparative study on the basis of adsorption capacity between CNTs and activated carbon as adsorbents for removal of noxious synthetic dyes: a review

Removal of Pb(II) ion from aqueous solution by graphene oxide and functionalized graphene oxide-thiol: effect of cysteamine concentration on the bonding constant

Removal of Malachite Green Dye From Aqueous Solution Using Multi-Walled Carbon Nanotubes: An Application of Experimental Design

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