Removal of polycyclic aromatic hydrocarbons from aged-contaminated soil using cyclodextrins: Experimental study

Viglianti, Christophe; Hanna, Khalil; Brauer, Christine de; Germain, Patrick

doi:10.1016/j.envpol.2005.08.002

Cited by 91 publications

(52 citation statements)

References 26 publications

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“…Na fase aquosa, os microorganismos podem degradar os contaminantes de forma muito mais fácil e rá-pida, isso porque estas moléculas se tornam disponíveis para o sistema microbial e ainda, em particular, pela capacidade que as CDs possuem em reduzir a toxicidade da molécula inclusa 83 . Hanna e colaboradores 84 têm utilizado β-CDs em água para o desenvolvimento de um método inovador para a despoluição de solos em áre-as industriais, contaminados com hidrocarbonetos policíclicos aromáticos (HPAs). Os estudos mostraram que o uso de CDs em água aumentou a capacidade de extração de HPAs em cerca de 200 vezes em comparação com a água pura 84 .…”

Section: Ciclodextrinas Em Química Ambientalunclassified

“…Hanna e colaboradores 84 têm utilizado β-CDs em água para o desenvolvimento de um método inovador para a despoluição de solos em áre-as industriais, contaminados com hidrocarbonetos policíclicos aromáticos (HPAs). Os estudos mostraram que o uso de CDs em água aumentou a capacidade de extração de HPAs em cerca de 200 vezes em comparação com a água pura 84 . Um outro aspecto das aplicações das CDs que vem ganhando destaque atualmente envolve seu uso no desenvolvimento de metodologias para a remoção do caráter tóxico (detoxificação) de muitos compostos potencialmente agressivos aos sistemas vivos.…”

Section: Ciclodextrinas Em Química Ambientalunclassified

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Propriedades e aplicações recentes das ciclodextrinas

Venturini¹,

Nicolini²,

Machado³

et al. 2008

Quím. Nova

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Recebido em 22/9/06; aceito em 22/5/07; publicado na web em 26/2/08 PROPERTIES AND RECENT APPLICATIONS OF CYCLODEXTRINS. Cyclodextrins (CDs) are cyclic oligosaccharides comprised of six or more glucose units connected by α-1,4 bonds. They have hydrophobic cavities with a hydrophilic exterior, and are versatile receptors for a variety of substrates. This ability allows them to be applied in many fields, as distinct as supramolecular chemistry, nanotechnology, pharmaceuticals, green chemistry, agrochemicals, analytical chemistry, toiletries, foods, and cosmetics. This review summarizes several aspects related to the physico-chemical properties of CDs and discusses their potential applications illustrated by recent examples. The prospects for their use in several areas are also described.Keywords: cyclodextrins; molecular recognition; inclusion complexes. INTRODUÇÃOAo longo das últimas décadas, as ciclodextrinas (CDs) vêm despertando grande interesse na comunidade científica e na química de macromoléculas, sendo descritas como "moléculas sedutoras, atraindo a atenção dos investigadores tanto no campo de pesquisa como no campo de tecnologias aplicadas" 1 . Szejtli afirmou que "dentre todas as moléculas receptoras em potencial, as CDs parecem ser as mais importantes" 2 . Tal afirmação deriva primordialmente do fato das mesmas, por pertencerem à família dos oligossacarídeos macrocíclicos, formarem complexos do tipo receptor-substrato servindo como um ambiente único para reações químicas 3 e possuírem a habilidade para formar complexos de inclusão com uma variedade de substâncias que têm suas propriedades alteradas pela complexação 4 . Por este motivo, as CDs vêm sendo muito utilizadas em produtos industriais, tecnológicos e em métodos analíticos. Como os efeitos tóxicos podem ser eliminados ou reduzidos pela seleção da CD apropriada, as CDs podem ser utilizadas como ingredientes de fármacos, em alimentos ou em cosméticos 2 . As CDs são formadas durante a ação de enzimas denominadas como CD glicosiltransferases (CGTases) sobre o amido 5 , sendo este o processo utilizado na produção industrial das mesmas. Usualmente, os polissacarídeos servem como precursores de oligos-sacarídeos cíclicos. Como resultado, a variedade de oligossacarídeos cíclicos naturais ou semi-sintéticos é limitada 6 . As mais importantes CDs apresentando ocorrência natural são as α-, β-e γ-CDs, que possuem 6, 7 e 8 monômeros de glicose, respectivamente (Figura 1). As características estruturais das mesmas são conhecidas com base em investigações por cristalografia de raios-X no estado sólido e por estudos de RMN em solução. Estas moléculas possuem forma assemelhada a um cone, com uma cavidade de 7,9 Å de profundidade. Os diâmetros superior e inferior da cavidade das CDs são 4,7 e 5,3 Å para a α-CD, 6,0 e 6,5 Å para a β-CD e 7,5 e 8,3 Å para a γ-CD 7. As CDs modificadas surgiram a partir da tentativa de alterar ou melhorar suas estruturas a fim de obter complexos de inclusão adequados a vários setores, como industrial, alimentício e farmacêutico 8 , e...

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Section: Ciclodextrinas Em Química Ambientalunclassified

Propriedades e aplicações recentes das ciclodextrinas

Venturini¹,

Nicolini²,

Machado³

et al. 2008

Quím. Nova

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“…Research has been published regarding the enhancement of the water solubility and/or bioavailability of contaminants with CD for a wide range of contaminants such as PCB (Balogh et al, 2007), trichloroethene (Fenyvesi et al, 2010), polycyclic aromatic hydrocarbons (Viglianti et al, 2006;Wang et al, 2005) and pesticides (Morillo et al, 2001;Wong and Bidleman, 2010). In addition, some field trials to test the remediation of chlorinated solvent-contaminated aquifer with cyclodextrin obtained good results (Blanford et al, 2001;Boving et al, 1998;McCray and Brusseau, 1998;Tick et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Potential of activated carbon to recover randomly-methylated-β-cyclodextrin solution from washing water originating from in situ soil flushing

Sniegowski

Vanhecke

D'Huys

et al. 2014

Science of The Total Environment

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“…It is generally accepted that degradation of organic contaminants can be limited by their low availability in soil, and addition of solubility-enhancement agents may improve degradation extents [35,36]. In order to enhance the availability of PCP in soil, experiments were carried out using methyl-β-cyclodextrin (M-β-CD).…”

Section: Closed-loop Recirculation Of Oxidantmentioning

confidence: 99%

“…from 28 to 41% for HP and from 62 to 73% for PS, while for PM the degradation extent 15 stayed almost constant (~73%). As for previous experiments, the addition of Fe-solids did not improve the oxidation efficiency for HP or PS in the closed-loop recirculating system.It is generally accepted that degradation of organic contaminants can be limited by their low availability in soil, and addition of solubility-enhancement agents may improve degradation extents [35,36]. In order to enhance the availability of PCP in soil, experiments were carried out using methyl-β-cyclodextrin (M-β-CD).…”

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confidence: 99%

Remediation of an aged PCP-contaminated soil by chemical oxidation under flow-through conditions

Rybnikova

Singhal

Hanna

2017

Chemical Engineering Journal

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To cite this version:V. Rybnikova, N. Singhal, K Hanna. Remediation of an aged PCP-contaminated soil by chemical oxidation under flow-through conditions. Chemical Engineering Journal, Elsevier, 2017Elsevier, , 314, pp.202-211. 10.1016Elsevier, /j.cej.2016 AbstractIn this study the oxidation of pentachlorophenol (PCP) in an aged contaminated soil was performed under both water-unsaturated and water-saturated conditions using potassium permanganate (PM), potassium persulfate (PS) and hydrogen peroxide (HP). Overall, the results of PCP removal extent and oxidant decomposition indicated that the water content in column has no significant impact on the oxidation performance. The increase in flow rate from 0.025 to 2.5 mL min -1 decreased the oxidant decomposition as well as the PCP degradation extent, except for HP that is highly reactive.Kinetic limitations in column may explain the effect of residence time of oxidant on the degradation performance. Consistently, re-circulation of oxidant solutions in a closed loop system improved the oxidation efficiency and oxidant decomposition extents in case of PS and PM, but not for HP .Surprisingly, attempts to enhance the PCP availability in soil by using solubility agents or by heating did not improve the degradation efficiency in soil. The presence of methyl-β-cyclodextrin Key words: pentachlorophenol; contaminated soil; oxidation; column; mobilization. 3 IntroductionPentachlorophenol ( Soil preparation and characterizationContaminated soil used in this study was obtained from a timber mill in Waipa district of Waikato Region, New Zealand. Prior to experiments, soil was dried, ground and passed through 1 mm (18 mesh) sieve. Obtained fraction was characterized by the Institute en Santé Agro Environnement (ISAE), Combourg, France. Soil characteristics are presented in Table 1. According to particle size distribution, the soil is classified as loamy sand. The soil is slightly carbonated and has a pH of 7.2.It contains 1.5% of organic matter and high concentrations of iron (9.8 g kg -1 ) and exchangeable cations (1.5 g kg -1 ). The total PCP concentration in soil is 6 mg kg -1 , which is above the quality 6 criteria of soil for agricultural use in New Zealand and considered as a soil with serious risk in NewZealand as well as in Europe [22].Iron speciation in soil. Iron speciation was performed using methods described by Van Bodegom et al. [23]. Total Fe content was determined by the extraction of 2 g of soil with 10 N HCl.Amorphous iron was extracted with oxalate solution (0.113 M sodium oxalate/0.086M oxalic acid). Experimental set-upFor preliminary tests, 2 g of PCP contaminated soil was transferred into glass vial of 40 ml and then mixed with oxidant solution. Final volume of reaction suspension was maintained at 2 ml to provide liquid/solid (L/S) ratio of 1:1. In experiments with magnetite or Fe 0 , nanoparticles were added and homogenized with the soil by magnetic stirring (400 rpm) before adding the oxidant. Blank tests were carried out without oxidants (with 2 ...

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Removal of polycyclic aromatic hydrocarbons from aged-contaminated soil using cyclodextrins: Experimental study

Cited by 91 publications

References 26 publications

Propriedades e aplicações recentes das ciclodextrinas

Propriedades e aplicações recentes das ciclodextrinas

Potential of activated carbon to recover randomly-methylated-β-cyclodextrin solution from washing water originating from in situ soil flushing

Remediation of an aged PCP-contaminated soil by chemical oxidation under flow-through conditions

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