The Adsorption of Pentachlorophenol from Aqueous Solutions onto Exchanged Al-MCM-41 Materials

Marouf-Khelifa, Kheira; Khelifa, Amine; Belhakem, Ahmed; Marouf, Réda; Abdelmalek, Fatiha; Addou, A.

doi:10.1260/026361704323150953

Cited by 18 publications

(20 citation statements)

References 35 publications

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“…A similar trend of change in DH for PCP adsorption on synthetic Al and Si compounds was observed with a negative DH average [35]. On the contrary, adsorption of 2,4-DCP, 2,4,6-TCP, and PCP on an allophanic soil increased with temperature, indicating an endothermic reaction, which was attributed to the formation of monodentate outer-and inner-sphere complexes between deprotonated organic molecules and active sites of the variable-charge soil [36].…”

Section: Effect Of Temperature On Tecp Adsorptionsupporting

confidence: 74%

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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Section: Effect Of Temperature On Tecp Adsorptionsupporting

confidence: 74%

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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“…Good agreement between the experimental isotherms and the Freundlich model was found in the case of systems: pentachlorophenol/(M)Al-MCM-41 [21], and toluene/activated carbon [22].…”

Section: Applied Model Non Linear Form Linear Formmentioning

confidence: 53%

Removal of Methylene Blue by Adsorption onto Retama Raetam Plant: Kinetics and Equilibrium Study

Badis¹,

Benmaamar²,

Benkortbi³

et al. 2016

ChemJMold

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Abstract. The feasibility of using medicinal plants species Retama raetam as a low cost and an eco-friendly adsorbent for the adsorption of cationic dye methylene blue from simulated aqueous solution has been investigated. Adsorption kinetics of methylene blue onto Retama raetam plants was studied in a batch system. The effects of pH and contact time were examined. The methylene blue maximum adsorption occurred at pH 8 and the lowest adsorption occurred at pH 2. The apparent equilibrium was reached after 120 min. Optimal experimental conditions were determined. Adsorption modelling parameters for Freundlich and Langmuir isotherms were determined and, based on R 2 , various error distribution functions were evaluated as well. Adsorption isotherm was best described by non linear Freundlich isotherm model. Thermodynamic studies show that adsorption was spontaneous and exothermic. For determining the best-fi t-kinetic adsorption model, the experimental data were analyzed by using pseudo-fi rst-order, pseudo-second-order, pseudo-third-order, Esquivel, and Elovich models. Linear regressive and non-linear regressive method was used to obtain the relative parameters. The statistical functions were estimated to fi nd the suitable method that fi t better the experimental data. Both methods were appropriate for obtaining the parameters. The linear pseudo-second-order (type 9 and type 10) models were the best to fi t the equilibrium data. The present work showed that plant Retama raetam can be used as a low cost adsorbent for the removal of methylene blue from water.Keywords: Retama raetam, methylene blue, removal, modelling, adsorption. IntroductionThe textile industry is one of industrial waste water source. This contaminated water is very toxic for the humans and animals [1]. Methylene blue is used in colouring paper, dyeing cottons, wools, silk, leather and coating for paper stock. Although methylene blue is not strongly hazardous, it can cause some harmful effects, such as heartbeat increase, vomiting, shock, cyanosis, jaundice, quadriplegia, and tissue necrosis in human organisms [2].Chemical coagulation-fl occulation [3], different types of oxidation processes [4], biological process [5], membrane-based separation processes [6] and adsorption [7] were the treatments used in the purifi cation of waters. The most effi cient method used for the quickly removal of dyes from the aqueous solution is the physical adsorption [8]. Biosorbents, such as wood sawdust [9], waste-biomass [10], delonix regia [11], agricultural solid waste [12], are able to remove effi ciently the colour from water.Retama raetam plants can be used as biosorbent. This species belonging to the Fabaceae family has a very productive vertical and horizontal root system, which can reach 20 m. This, in turn, increases substantially the stabilization of the soil. Moreover, the Retama species contributes to the biofertilisation of poor grounds, because of their aptitude to associate with fi xing nitrogen bacteria Rhizobia. Therefore, the genus of Retama is ...

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“…This time was used for all the equilibrium adsorption experiments reported here. The results concerning the adsorption of PCP from aqueous solution by activated sludge biomass [29] and by (M)Al-MCM-41 [30] also showed that the equilibrium was attained within less than 2 h. Adsorption isotherms are depicted in Fig. 2 as plots of the amount adsorbed per g of adsorbent (mmol/g) (Q e ) as a function of the quantity of PCP remaining in the equilibrium solution (mmol/l) (C e ).…”

Section: Adsorption Isotherms Of Pcpmentioning

confidence: 91%

“…The fits of all the isotherms by the Freundlich model were insufficient to explain the data, in particular for D-900 and especially D-1000, although this model has been successfully applied to describe the sorption of PCP onto activated sludge biomass [29], peat/bentonite mixtures [40], (M)Al-MCM-41 [30], chitosan [10], and compost [11].…”

Section: Fitting the Models To The Experimental Datamentioning

confidence: 99%

Removal of pentachlorophenol from aqueous solutions by dolomitic sorbents

Marouf

Khelifa

Marouf-Khelifa

et al. 2006

Journal of Colloid and Interface Science

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The Adsorption of Pentachlorophenol from Aqueous Solutions onto Exchanged Al-MCM-41 Materials

Cited by 18 publications

References 35 publications

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

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

Removal of Methylene Blue by Adsorption onto Retama Raetam Plant: Kinetics and Equilibrium Study

Removal of pentachlorophenol from aqueous solutions by dolomitic sorbents

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