Adsorption of basic dyes on activated carbon prepared from Polygonum orientale Linn: Equilibrium, kinetic and thermodynamic studies

Wang, Li; Zhang, Jian; Zhao, Ran; Li, Cong; Li, Ye; Zhang, Chenglu

doi:10.1016/j.desal.2009.12.012

Cited by 277 publications

(108 citation statements)

References 41 publications

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“…There are several techniques for the removal of malachite green from wastewater, such as photocatalysis [8][9][10] , nanofibermembrane 11 , precipitation 12 , electrocoagulation, flotation, chemical oxidation, filtration, ozonation 13 ,microbial degradation, ion exchange, and adsorption [14][15][16][17][18][19] . Among those techniques, adsorption is the most promising process for the removal of dyes from wastewater.…”

mentioning

confidence: 99%

Thermodynamic and kinetic study of the intrinsic adsorption capacity of graphene oxide for malachite green removal from aqueous solution

Nuengmatcha¹,

Mahachai²,

Chanthai³

2014

Orient J Chem

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Graphene oxide (GO) was produced from bare graphite (BGP) material and was used as an intrinsic adsorbent for the removal of malachite green (MG) from aqueous solution. In an optimization study, the effects of the initial concentration of MG, solution pH, adsorbent dosage, contact time and ionic strength were investigated in detail. The water-soluble dye was analyzed at a maximum wavelength of 618 nm. The optimum conditions for MG removal from aqueous solution included a 300 mg/L initial concentration with 0.02 mg adsorbent at pH 5.1, and complete adsorption equilibrium was reached within 40 min. The maximum adsorption capacity of GO for MG was 384.62 mg/g, dramatically higher (over 10 times) than that of BGP (28.73 mg/g).The adsorption process followed pseudo-second-order kinetics. Thermodynamic data demonstrated that dye adsorption onto the GO surface was mainly an exothermic spontaneous reaction. The remarkably different adsorption isotherms for GO and BGP fit well with the Langmuir and Freundlich models, respectively. It is therefore evident that the prepared GO can be used as a highly effective adsorbent for this toxic dye.

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mentioning

confidence: 99%

Thermodynamic and kinetic study of the intrinsic adsorption capacity of graphene oxide for malachite green removal from aqueous solution

Nuengmatcha¹,

Mahachai²,

Chanthai³

2014

Orient J Chem

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“…The percentage removal of CR from the solution increased from 30% to 86% as the adsorbent dosage increased from 0.025 to 0.25 gm. This result is expected because of the increased adsorbent surface area and availability of more adsorption sites caused by increasing adsorbent dosage 23,24 .…”

Section: Effect Of Adsorbent Dosagementioning

confidence: 94%

“…Consequently, the electrostatic interaction between the positively charged adsorbent and the CR anions increased, which resulted in increased adsorption. Furthermore, the lower adsorption removal percentage at alkaline pH contributed to the presence of excess hydroxyl ions, which competed with the CR molecules for adsorption sites 23 . In contrast, as expressed in equilibrium equation (3), the quinoid structure of CR is more easily reduced than its azo structure 26 .…”

Section: Effect Of Solution Phmentioning

confidence: 99%

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Removal of Azo Dye from Aqueous Solutions using Chitosan

Jabbar¹,

Angham²,

Hadi³

2014

Orient. J. Chem.

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Adsorption of Congo Red (CR) from aqueous solution onto chitosan was investigated in a batch system. The effects of solution pH, initial dye concentration, and temperature were studied. Results indicated that chitosan could be used as a biosorbent to remove the azo dyes from contaminated water. Synthesize of chitosan involved three main stages as preconditioning, demineralization, deproteinization and deacetylation. Chitosan was characterized using Fourier Transform Infrared Spectroscopy (FTIR) and solubility in 1% acetic acid.

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“…Furthermore, the negative values of DH°for Cr(III) and Cr(VI) were obtained as 66.46 9 10 -1 and 17.84 9 10 --1 kJ mol -1 , respectively, indicative of principal role of electrostatic interactions and exothermic nature of the sorption process (Wang et al 2010;Gupta et al 2011b). …”

Section: Sorption Thermodynamicsmentioning

confidence: 96%

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

2015

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Site-specific functionalizations are the emergent attention for the enhancement of sorption latent of heavy metals. Limited chemistry has been applied for the fabrication of diafunctionalized materials having potential to tether both environmentally stable oxidation states of chromium (Cr(III) and Cr(VI). Polyaniline impregnated nanocellulose composite (PANI-NCC) has been fabricated using click chemistry and explored for the removal of Cr(III) and Cr(VI) from hydrological environment. The structure, stability, morphology, particle size, surface area, hydrophilicity, and porosity of fabricated PANI-NCC were characterized comprehensively using analytical techniques and mathematical tools. The maximum sorption performance of PANI-NCC was procured for (Cr(III): 47.06 mg g -1 ; 94.12 %) and (Cr(VI): 48.92 mg g -1 ; 97.84 %) by equilibrating 0.5 g sorbent dose with 1000 mL of 25 mg L -1 chromium conc. at pH 6.5 and 2.5 for Cr(III) and Cr(VI), respectively. The sorption data showed a best fit to the Langmuir isotherm and pseudosecond-order kinetic model. The negative value of DG°(-8.59 and -11.16 kJ mol -1 ) and DH°(66.46 9 10 -1 and 17.84 9 10 -1 kJ mol -1 ), and positive value of DS°(26.66 and 31.46 J mol -1 K -1 ) for Cr(III) and Cr(VI), respectively, reflect the spontaneous, feasibility, and exothermic nature of the sorption process. The application of fabricated PANI-NCC for removing both the forms of chromium in the presence of other heavy metals was also tested at laboratory and industrial waste water regime. These findings open up new avenues in the row of high performance, scalable, and economic nanobiomaterial for the remediation of both forms of chromium from water streams.

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Adsorption of basic dyes on activated carbon prepared from Polygonum orientale Linn: Equilibrium, kinetic and thermodynamic studies

Cited by 277 publications

References 41 publications

Thermodynamic and kinetic study of the intrinsic adsorption capacity of graphene oxide for malachite green removal from aqueous solution

Thermodynamic and kinetic study of the intrinsic adsorption capacity of graphene oxide for malachite green removal from aqueous solution

Removal of Azo Dye from Aqueous Solutions using Chitosan

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

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