Removal of chlorophenols from groundwater by chitosan sorption

Zheng, Shuilin; Zhang, Yang; Jo, D; Park, Yun Hee

doi:10.1016/j.watres.2004.02.010

Cited by 90 publications

(29 citation statements)

References 16 publications

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“…Similar behavior has been reported by Halhouli et al 33 for phenol adsorption by activated carbon and by Banat et al 14 for phenol adsorption by bentonite. Similar results have also been obtained for phenol adsorption with chitosan, 34 chitin, 35 and bagasse fly ash. 19,36 It should be taken into account that, in this work, all experiments were conducted at pH 6 due to the solubility of chitosan at low pH, furthermore because of the pH of the wastewater investigated.…”

Section: Effect Of Phsupporting

confidence: 85%

Removal of phenol and conventional pollutants from aqueous effluent by chitosan and chitin

Milhome¹,

Keukeleire²,

Ribeiro³

et al. 2009

Quím. Nova

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Recebido em 7/1/09; aceito em 27/4/09; publicado na web em 7/10/09The present study deals with phenol adsorption on chitin and chitosan and removal of contaminants from wastewater of a petroleum refinery. The adsorption kinetic data were best fitted to first-and second-order models for chitosan and chitin, respectively. The results of adsorption isotherms showed Langmuir model more appropriately described than a Freundlich model for both adsorbents. The adsorption capacity was 1.96 and 1.26 mg/g for chitin and chitosan, respectively. Maximum removal of phenol was about 70-80% (flow rate: 1.5 mL/min, bed height: 18.5 cm, and 30 mg/L of phenol. Wastewater treatment with chitin in a fixed-bed system showed reductions of about 52 and 92% for COD and oil and greases, and for chitosan 65 and 67%, respectively. The results show improvement of the effluent quality after treatment with chitin and chitosan.

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Section: Effect Of Phsupporting

confidence: 85%

Removal of phenol and conventional pollutants from aqueous effluent by chitosan and chitin

Milhome¹,

Keukeleire²,

Ribeiro³

et al. 2009

Quím. Nova

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show abstract

“…The results were plotted as mass or percentage of solute adsorbed against the solution pH without conducting a full-scale adsorption isotherm study [14,[19][20][21][22]. Therefore, it is somehow critical to investigate whether the same adsorption isotherm follows at different solution pH conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of solution pH on adsorption of chlorophenols by cross‐linked polyvinyl pyrrolidone (PVP XL) polymers

Li¹,

Matoska²,

Rohrer³

2010

Env Prog and Sustain Energy

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Widely used as insecticides, fungicides, and disinfectants and regarded as having relatively high toxicities, chlorophenols are a group of organic contaminants whose solubility and sorptive properties on different substrates vary greatly with solution pH. In this study, the feasibility and applicability of using crosslinked polyvinyl pyrrolidone (PVP XL) polymers to adsorb and remove chlorophenols from water under different pH conditions were investigated. The adsorption of chlorophenols on PVP XL was instantaneous and followed a linear sorption isotherm under the tested concentrations from 0.05 to 10 mg L -1 , suggesting a partitioning mechanism. The chlorophenol adsorption increased as the degree of chlorination, thus the octanol-water partitioning coefficient, increased. A decrease in contaminant distribution coefficients with an increase in solution pH suggested that the deprotonated species had a weaker affinity for PVP XL surfaces than their protonated counterparts. The free energy of adsorption of 2,3,4,6-tetrachlorophenol (TeCP) on PVP XL was negative, suggesting a spontaneous adsorption. The negative enthalpy values of TeCP adsorption on PVP XL indicated an exothermic process. The results from this study show that PVP XL could be a viable alternative for the adsorption of chlorinated phenols in aqueous media as a remediation tool. The instantaneous adsorption will make PVP XL a possible choice for ultra filtration to remove chlorophenols from water.

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“…Dichlorophenols (DCP), such 34 as 2,3-DCP, 2,4-DCP, 2,5-DCP, and 2,6-DCP, have limited degradation by most conventional 35 biological processes due to their toxicity (Zheng et al, 2004;Ye and Shen, 2004). The 36 photocatalysis with immobilized TiO 2 thin films is an alternative to using TiO 2 powder with ease 37 of separating TiO 2 catalyst from aqueous suspension (Arabatzis et al, 2002;Gracia et al, 2004).…”

Section: Introduction 31mentioning

confidence: 99%

Effects of dissolved oxygen, pH, and anions on the 2,3-dichlorophenol degradation by photocatalytic reaction with anodic TiO2 nanotube films

et al. 2008

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11In this study, the highly-ordered TiO 2 nanotube (TNT) arrays on titanium sheets were prepared 12 by an anodic oxidation method. Under UV illumination, the TNT films demonstrated the higher 13 photocatalytic activity in terms of 2,3-dichlorophenol (2,3-DCP) degradation in aqueous solution 14 than the conventional TiO 2 thin films prepared by a sol-gel method. The effects of dissolved 15 oxygen (DO) and pH on the photocatalytic degradation of 2,3-DCP were investigated. The results 16showed that the role of DO in the 2,3-DCP degradation with the TNT film was significant. It was 17 found that 2,3-DCP in alkaline solution was degraded and dechlorinated faster than that in acidic 18 solution whereas dissolved organic carbon removal presented an opposite order in dependence of 19 pH. In the meantime, some main intermediate products from 2,3-DCP degradation were identified 20 by a

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Removal of chlorophenols from groundwater by chitosan sorption

Cited by 90 publications

References 16 publications

Removal of phenol and conventional pollutants from aqueous effluent by chitosan and chitin

Removal of phenol and conventional pollutants from aqueous effluent by chitosan and chitin

Effects of solution pH on adsorption of chlorophenols by cross‐linked polyvinyl pyrrolidone (PVP XL) polymers

Effects of dissolved oxygen, pH, and anions on the 2,3-dichlorophenol degradation by photocatalytic reaction with anodic TiO2 nanotube films

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