The removal of phenol from aqueous solutions by adsorption using surfactant-modified bentonite and kaolinite

Al-Karam, Uday F.; Mukhlis, Abduljabar A.; Al-Dujaili, Ammar H.

doi:10.1016/j.jhazmat.2009.03.153

Cited by 303 publications

(118 citation statements)

References 36 publications

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“…The pseudo-first order equation of Lagergren as reported and frequently used in adsorption kinetic studies [2,14,20] is generally expressed as Eq. (6): (6) where, q e and q t are the amounts of adsorbate sorbed per unit weight of adsorbent at equilibrium and time t, respectively (mg/g) and k 1 is the rate constant (min -1 ).…”

Section: Pseudo-first Order Modelmentioning

confidence: 99%

“…Phenolic compounds are common contaminants in wastewater, being generated from petroleum and petrochemical, coal conversion, pulp and paper and phenol producing industries. They are considered priority pollutants since they are harmful to organisms at low concentrations and many of them have been classified as hazardous pollutants because of their potential harm to human health [2]. Due to the enormously increasing importance of petroleum for industrial development during the last century, petrochemical effluents have had a significant impact on the pollution of surface water systems.…”

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confidence: 99%

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Adsorptive Removal of p-Nitrophenol from Aqueous Solution by Bone Char: Equilibrium and Kinetic Studies

Egbuchunam¹,

Obi²,

Yetgin³

et al. 2016

JCCE

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Para-nitrophenol adsorbed on bone char synthesized from cow bones has been studied. The Langmuir Freundlich and Sips models were applied to the equilibrium data to describe the adsorption process. The Langmuir model best described the adsorption process with R 2 = 0.919; and maximum adsorption capacity, q max of 365.76 mg/g. Batch kinetic studies conformed to pseudo-second-order indicating that several mechanisms may be involved in the process and gave a value of 2.5 × 10 4 g/mg/min for the rate constant for the sorption of p-nitrophenol on bone char. The values of thermodynamic parameters, free energy ≈ -22.0 kJ/mol, enthalpy -20.2 kJ/mol and entropy 5.34 J/K mol for the adsorption of p-nitrophenol on bone char showed that the adsorption was spontaneous and exothermic.

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Section: Pseudo-first Order Modelmentioning

confidence: 99%

mentioning

confidence: 99%

Adsorptive Removal of p-Nitrophenol from Aqueous Solution by Bone Char: Equilibrium and Kinetic Studies

Egbuchunam¹,

Obi²,

Yetgin³

et al. 2016

JCCE

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“…4c. Adsorption capacity increased as temperature increased, indicating higher temperatures enhance adsorption, which may be an endothermic process (Kul and Koyuncu 2010;Alkaram et al 2009;Panahi et al 2009). Previous studies have indicated that this effect appears to be caused by the increase in mobility of the xylene with an increase in temperature (Dogan et al 2000).…”

Section: Sorptionmentioning

confidence: 99%

Tin(IV) oxide nanoparticles grafted with N,N-dimethylacrylamide–allyl butyl ether for xylene adsorption

Ardakani

Panahi

Hasani

et al. 2015

Int. J. Environ. Sci. Technol.

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This study presents a two-stage method for modification of tin(IV) oxide using (3-mercaptopropyl) trimethoxysilane and grafting of N,N-dimethylacrylamideallyl butyl ether copolymer. The resulting sorbent was characterized by Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis, transmission electron microscopy, scanning electron microscopy, and the Brunauer-Emmett-Teller method and evaluated for xylene adsorption from environmental water samples. Batch experiments were conducted to evaluate the effect of the analytical parameters of pH, contact time, initial concentration and temperature. The optimum pH was 5, contact time was 5 min, and temperature for sorption of xylene was 30°C. The capacity of the sorbent was 8.56 mg g -1 .Results showed good accessibility of the active sites. The equilibrium adsorption data of xylene sorption onto grafted nano-tin(IV) oxide were analyzed using the Langmuir, Freundlich, Temkin, and Redlich-Peterson isotherm models. The adsorption data were modeled as pseudo-firstorder, pseudo-second-order, and intra-particle diffusion kinetic equations. The results show that adsorption followed by the Langmuir isotherm and the pseudo-secondorder model and intra-particle diffusion model showed more than one process is controlling the adsorption process. The sorbent removed more than 90 % of the xylene from the water solution samples.

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“…[1][2][3][4][5][6][7][8][9][10][11][12] O conhecimento sobre tais processos manifesta-se em diferentes setores da sociedade como agricultura, indústrias, águas, etc.. 13 Diversas espécies químicas podem ser adsorvidas em diferentes substratos, como as argilas.…”

Section: Introductionunclassified

Adsorção do corante azul de metileno em partículas de argilominerais: análise dos tamanhos das partículas

Sartori¹,

Morais²,

Filho³

et al. 2011

Quím. Nova

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Recebido em 15/4/10; aceito em 4/11/10; publicado na web em 18/2/11 ADSORPTION OF METHYLENE BLUE ON CLAY MINERALS PARTICLES: ANALYSIS OF THE CLAY PARTICLE SIZES.Interactions of cationic dye methylene blue (MB) with clay particles in aqueous suspension have been extensively studied. As already known, the number of natural negative charges on the clay modifies significantly the particle sizes dispersed in water and therefore the nature of the interaction with the dye. This work evaluated with UV-Vis spectroscopy method how the clay particle sizes weighted on the adsorption and rearrangement of the dye molecules in aqueous system. The results obtained from light-scattering measurements confirmed that larger particles are found in suspensions containing the high-charged clays as the visible absorption band related to the MB aggregates (570 nm) on these suspensions prevailed.Keywords: clays; methylene blue; UV-Vis spectroscopy. INTRODUÇÃOSempre houve um interesse muito grande nos processos de adsorção de moléculas orgânicas em sistemas coloidais aquosos, sobretudo naqueles contendo argilominerais. 1-12 O conhecimento sobre tais processos manifesta-se em diferentes setores da sociedade como agricultura, indústrias, águas, etc.. 13 Diversas espécies químicas podem ser adsorvidas em diferentes substratos, como as argilas. Argilas 13-17Os argilominerais são os minerais constituintes das argilas. Eles são silicatos hidratados dispostos em camadas (ou lamelas) formadas por subcamadas (ou "folhas") de tetraedros de silício (ou alumínio) e oxigênio e subcamadas de octaedros compostos por átomos de alumínio (ou ferro e magnésio) e oxigênio. Há uma classificação dos argilominerais em função da disposição das subcamadas, a qual considera a razão entre as subcamadas tetraédrica e octaédrica, respectivamente. Por exemplo, um mineral formado por uma subcamada tetraédrica e uma octaédrica é classificado como argilomineral do tipo 1:1. Se houver duas subcamadas tetraédricas e uma octaédrica, o material é classificado como mineral do tipo 2:1.Pode ainda haver substituições de alguns dos átomos nas estruturas que compõem o argilomineral. Quando átomos de Si 4+ são substituídos por Al 3+ na folha octaédrica, e átomos de Al 3+ são substituídos por Mg 2+ , o material fica com carga líquida negativa, que é contrabalanceada por íons metálicos como Na + , K + , Ca 2+ , etc., ou íons moleculares como NH 4 + , moléculas de surfactantes e corantes catiônicos, etc., presentes nas superfícies das partículas. A quantidade desses contra-íons pode ser medida e resulta na capacidade de troca catiônica (ctc) da argila, expressa usualmente em miliequivalentes do íon para cada 100 g de argila (meq/100 g). As montmorilonitas, por exemplo, possuem ctc que podem variar de 70 até 170 meq/100 g. 13 Outra característica de algumas argilas é a sua capacidade de adsorção de moléculas de água na superfície das camadas, fazendo com que haja um inchamento e provocando a dispersão das mesmas, quando há água suficiente para isso. No entanto, geralmente essa dispers...

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The removal of phenol from aqueous solutions by adsorption using surfactant-modified bentonite and kaolinite

Cited by 303 publications

References 36 publications

Adsorptive Removal of p-Nitrophenol from Aqueous Solution by Bone Char: Equilibrium and Kinetic Studies

Adsorptive Removal of p-Nitrophenol from Aqueous Solution by Bone Char: Equilibrium and Kinetic Studies

Tin(IV) oxide nanoparticles grafted with N,N-dimethylacrylamide–allyl butyl ether for xylene adsorption

Adsorção do corante azul de metileno em partículas de argilominerais: análise dos tamanhos das partículas

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