Adsorptive removal of Auramine-O: Kinetic and equilibrium study

Mall, Indra Deo; Srivastava, Vimal Chandra; Agarwal, Nitin Kumar

doi:10.1016/j.jhazmat.2006.09.059

Cited by 125 publications

(57 citation statements)

References 25 publications

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“…The maximum amounts of the dye adsorbed on the surface of the oxidised mesoporous carbon samples of regular structure are much higher than those adsorbed on the activated carbon samples and bagasse fly ash (Mall et al 2007). The carbon samples C KIT-6 modified with ammonium persulfate solution at 60 and 100°C also show higher sorption capacities towards AO than the natural biopolymer poly(cglutamic acid) (Inbaraj et al 2006).…”

Section: Adsorption Studiesmentioning

confidence: 89%

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The effect of surface modification of mesoporous carbons on Auramine-O dye removal from water

2015

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Mesoporous carbon of regular structure was subjected to oxidation by ammonium persulfate at 30, 60 or 100°C. The mesostructure and pore evolution were characterised by XRD, TEM, and N 2 sorption techniques. The functional groups present on the surface of the carbon materials were identified by FTIR and thermogravimetric studies. It was established that the micropores and small mesopores could be blocked by the surface oxides attached under mild oxidation. High densities of surface oxygen complexes, especially carboxylic groups, were generated on the surface of mesoporous carbons. All materials obtained were tested for the removal of Auramine-O from aqueous solution. Adsorption experiments were carried out as batch studies at different contact time, pH and initial dye concentration. Removal of this cationic dye in basic solutions was more effective than in acidic solutions. The highest sorption capacity towards Auramine-O was obtained for the carbon sample oxidised by ammonium persulfate solution at 100°C. Fitting equilibrium data to Langmuir and Freundlich isotherms showed that Langmuir model was more suitable to describe the Auramine-O adsorption. The changes in standard enthalpy (DH 0 ), standard entropy (DS 0 ) and Gibbs free energy (DG 0 ) were analysed. Thermodynamic study showed that the adsorption of Auramine-O was a spontaneous and exothermic process.

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Section: Adsorption Studiesmentioning

confidence: 89%

“…The dye molecules have to traverse farther and deeper into the pores encountering much greater resistance. This results in the slowing down of the adsorption in the later period of the process (Mall et al 2007;Asfaram et al 2015).…”

Section: Adsorption Studiesmentioning

confidence: 99%

The effect of surface modification of mesoporous carbons on Auramine-O dye removal from water

2015

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“…About 128 MT of residual dyes are discharged globally into the environment per day, which pollutes water [20], may be directly poisonous and carcinogenic to the human body through the food chain, is hazardous to aquatic life [21]- [24], influences the light penetration ability of water, and degrades the self-purification capacity of rivers [25]. According to the Ecological and Toxicological Association of the Dyestuffs Manufacturing Industry investigation of 4,000 kinds of dyes on the market, the half lethal dose value of over 90% of them is 2×10 3 mg/kg, where basic dyes and diazo direct dyes have the highest toxicity [26], [27].…”

Section: Introductionmentioning

confidence: 99%

Adsorption for Dyes on Activation Carbons from Japanese Cedar Wood Prepared by Precarbonization and Two-stage Composite Activations with Wood Ash and Steam

ChiaWen¹,

Lin²

2017

IJCEA

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“…Auramine O (AO) and its hydrochloride salt are used in the coloring of paper, textiles and leather; also as food dye 8 .International Agency for Research on Cancer included AO is sufficient evidence of carcinogenicity in experimental animals due to its bio-transformation to reactive species in target organs of both rats and humans 9 . AO, and its hydrochloride salts are used for coloring paper, textiles and leather 10 . International Agency for Research on Cancer (IARC) expressed more evidence of carcinogenicity ability of AO among chemicals related to its bio-transformation to reactive species in target organs of rats and humans 11,12 .…”

Section: Introductionmentioning

confidence: 99%

Modeling of Competitive Ultrasonic Assisted Removal of The Crystal Violet and Aura Mineo using Mwcnts Functionalized by N-(3-Nitrobenzylidene)-Nˊ-Trimethoxysilylpropyl-Ethane-1,2-Diamine:Equilibrium, Kinetics and Thermodynamic Study

Raoufi¹

2016

Orient. J. Chem

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In this study, adsorbent was synthesized by covalently anchoring N-(3-nitro-benzylidene)-N-trimethoxysilylpropyl-ethane-1, 2-diamine onto multi-walled carbon nanotubes (NBATSPEDMWCNTs). This novel material was characterized by different techniques such as XRD, SEM and FT-IR.Subsequently, it was used for the ultrasound-assisted removal of Aura mine O(AO) and Crystal violet (CV) from aqueous solutions was investigated. The dependency of removal percentages to variables such as pH, initial dyes concentration,adsorbent dosage, sonication time on the removal percentages of AO and CV were simultaneously investigated by central composite design (CCD) under response surface methodology (RSM). It was shown that the adsorption of AO and CV follows the pseudo-second-order rate equation, while the Langmuir model explains equilibrium data. Isotherms had also been used to obtain the thermodynamic parameters such as free energy (DG°), enthalpy (DH°) and entropy (DS°) of adsorption. The negative value of DG° indicates the feasibility and spontaneity of the adsorption process. The positive DH° suggests the endothermic nature of the adsorption. The positive values of DS 0 reflect the affinity of multi-walled carbon nanotubes functionalized towards CV and AO. A small amount of the adsorbent was able to remove more than 99.20% of both dyes rapidly with high adsorption capacity in binary-component system (69.36 mgg -1 and 120.65mg g -1 for AO and CV respectively).

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Adsorptive removal of Auramine-O: Kinetic and equilibrium study

Cited by 125 publications

References 25 publications

The effect of surface modification of mesoporous carbons on Auramine-O dye removal from water

The effect of surface modification of mesoporous carbons on Auramine-O dye removal from water

Adsorption for Dyes on Activation Carbons from Japanese Cedar Wood Prepared by Precarbonization and Two-stage Composite Activations with Wood Ash and Steam

Modeling of Competitive Ultrasonic Assisted Removal of The Crystal Violet and Aura Mineo using Mwcnts Functionalized by N-(3-Nitrobenzylidene)-Nˊ-Trimethoxysilylpropyl-Ethane-1,2-Diamine:Equilibrium, Kinetics and Thermodynamic Study

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