Removal of BTEX from aqueous solution using<i>Moringa oleifera</i>seed cake

Almeida, Ione Lucenir Silva; Filho, Nelson Roberto Antoniosi; Alves, Maria Isabel Ribeiro; Carvalho, Brenda G.; Coelho, Nívia M. M.

doi:10.1080/09593330.2011.621451

Cited by 25 publications

(4 citation statements)

References 33 publications

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“…There are also releases from large bulk facilities, surface spills, and pipeline leaks. − Several treatment methods have been developed to remove BTEX from industrial wastewater. They include ion-exchange, filtration, adsorption, and the use of various types of sorbents. − In recent years surfactant-modified zeolites (SMZ) have been shown to be effective sorbents for the removal of BTEX from water . The presence of the surfactant molecules imparts hydrophobic properties to the zeolite surface and allows the zeolite to sorb organic compounds. , …”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Removal of VOCs and PAHs by Zeolites and Surfactant-Modified Zeolites

et al. 2017

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Synthetic zeolite Na-X and clinoptilolite (Cp) as well as their modifications with quaternary ammonium salts were used to remove volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs) from aqueous solutions. A novel procedure was developed for the synthesis of organo-zeolites which consisted of surface modification with hexadecyltrimethylammonium bromide (HDTMA) in amounts of 1.0 and 2.0 of external cation exchange capacity (ECEC). Modification of both zeolites with HDTMA improved sorption properties. p-Xylene and dibenz[a,h]anthracene were adsorbed in amounts of 6.82 and 0.65 mg/g, respectively. Ethylbenzene and naphthalene were the lowest-removed hydrocarbons (2.99 and 0.058, respectively). The removal efficiencies for BTEX followed the order p-xylene > toluene > benzene > ethylbenzene, and for PAHs they followed the order dibenz[a,h]anthracene > benzo[a]pyrene > anthracene > naphthalene. Efficiency of sorption depends on the chemical properties of the various organic compounds (dipole moment, molar mass, molecule structure, and the time of the sorption process) and zeolites properties, like the Si/Al ratio, texture parameters, particle size, and external cation exchange capacity. The mechanism of the sorption consists of dissolving the VOCs and PAHs into the organic layer of the surfactant as well as on the penetration of organic solution into the mesopores.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Removal of VOCs and PAHs by Zeolites and Surfactant-Modified Zeolites

et al. 2017

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“…Therefore, over the last few years a number of investigations have been carried out to utilize low-cost naturally occurring and efficient adsorbents such as wood, red mud, coconut shell, chitin, and sugarcane bagasse [11][12][13]. In recent years there has been increasing interest in utilizing agricultural by-products like tamarind fruit shell, orange peel, pine bark, and spent tea leaves as adsorbents for the removal of toxic metals and some organic pollutant from aqueous solutions [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Chemically treated kola nut pod as low-cost natural adsorbent for the removal of 2,4-dinitrophenol from synthetic wastewater: batch equilibrium, kinetic, and thermodynamic modelling studies

Agarry¹,

Ogunleye²

2014

Turkish J Eng Env Sci

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Abstract:The feasibility of using chemically treated kola nut pod to remove 2,4-dinitrophenol from its aqueous solutions under batch mode was investigated. The results showed that biosorption of 2,4-dinitrophenol was dependent on initial concentration, contact time, pH, biosorbent particle size, biosorbent dosage, and temperature. The batch equilibrium biosorption data were analyzed by 2 two-parameter (Langmuir and Freundlich) and 2 three-parameter (Redlich-Peterson and Sips) adsorption isotherm models using linear and nonlinear regression methods. The Sips isotherm equation employing the parameter sets derived using the HYBRID/MPSD/ARE errors provided the overall best model to describe the biosorption data of the 2,4-dinitrophenol-kola nut pod system. The maximum monolayer biosorption capacity ( Qmax) was obtained to be 32.26 mg/g with linear regression and 30.10 mg/g with nonlinear regression. The biosorption kinetic data were fitted to 6 biosorption kinetic models using the linear regression method. The 6 kinetic models fitted well to the biosorption kinetic data; however, the pseudo-first-order kinetic model gave the best fit and the biosorption mechanism was controlled by film diffusion. The thermodynamic analysis indicates that the biosorption process was spontaneous, feasible, exothermic, and physical in nature. Thus, chemically modified kola nut pod has potential for application as an effective bioadsorbent for 2,4-dinitrophenol removal from wastewater.

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“…Several treatment methods have been developed to remove those contaminants from industrial wastewater, including ion-exchange, filtration, adsorption and the use of various types of sorbents (Kibazohi et al 2004;Mathur et al 2007;Aivaliotiet al 2012;Almeida et al 2012). Research conducted by scientists around the world on the sorption properties of organo-minerals has proved that zeolites may be an appropriate substance to aid in the sorption of organic compounds (Zhao, Vance 1998;Meininghaus, Prins 2000;Lee, Tiwari 2012;Xie et al 2013;Szala et al 2015;Muir et al 2016a;Bandura et al 2017a).…”

Section: Fig 1 Contamination Of Water Resources Particularly-organmentioning

confidence: 99%

The Removal of Organic Compounds by Natural and Synthetic Surface-Functionalized Zeolites: A Mini-Review

Muir¹,

Wołowiec

Bajda

et al. 2017

Mineralogia

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Abstract. The use of zeolites as sorbents has been investigated as a replacement for existing costly methods of removing organic contaminants from water solutions. Zeolites can be modified by inorganic salts, organic surfactants, metals or metal oxides in order to increase their adsorption capacity. The unique ion exchange and adsorption properties of zeolites make them very suitable for application in the removal of organic compounds such as volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), phenols and other complex petrochemicals. Many different studies have demonstrated their effectiveness in reducing the concentrations of organic contaminants as well as petroleum derivatives in water, which has been summarized in this paper.

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Removal of BTEX from aqueous solution usingMoringa oleiferaseed cake

Cited by 25 publications

References 33 publications

Experimental Study on the Removal of VOCs and PAHs by Zeolites and Surfactant-Modified Zeolites

Experimental Study on the Removal of VOCs and PAHs by Zeolites and Surfactant-Modified Zeolites

Chemically treated kola nut pod as low-cost natural adsorbent for the removal of 2,4-dinitrophenol from synthetic wastewater: batch equilibrium, kinetic, and thermodynamic modelling studies

The Removal of Organic Compounds by Natural and Synthetic Surface-Functionalized Zeolites: A Mini-Review

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