Effect of the pH in the adsorption and in the immersion enthalpy of monohydroxylated phenols from aqueous solutions on activated carbons

Blanco-Martínez, Diego A.; Giraldo, Liliana; Moreno–Piraján, Juan Carlos

doi:10.1016/j.jhazmat.2009.03.099

Cited by 55 publications

(29 citation statements)

References 34 publications

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“…Adsorption onto activated carbons (ACs) is often considered, amongst the methods currently employed to remove inorganic and organic pollutants, from aqueous or gaseous phases, as the most efficient [6][7][8][9][10][11][12][13]. Activated carbon can be produced from a large selection of relatively low cost carbonaceous materials, containing high carbon content, and allow adsorbents to be obtained more economically when compared to other conventional materials.…”

Section: Introductionmentioning

confidence: 99%

“…For these circumstances, the Freundlich equation can provide a very satisfactory description of non-linear adsorption isotherms. The applicability of the Freundlich equation to systems involving heterogeneous surfaces and organic compounds, such as phenol and phenolderivatives, was reported to be very acceptable over a wide range of concentrations [6,14].…”

Section: Introductionmentioning

confidence: 99%

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The influence of the activated carbon post-treatment on the phenolic compounds removal

Cansado

Mourão

Falcão

et al. 2012

Fuel Processing Technology

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The aim of this research was to investigate how post treatment modification, such as those with sodium hydroxide or urea, can influence the capacity of activated carbon (AC) for phenolic compounds removal from liquid media. The ACs modification was performed using urea impregnation followed by pyrolysis at high temperature. With all ACs used, this treatment induced a pore volume increase, a mean pore size broadening, an increase in the point of zero charge and also in the basic character. The modification with sodium hydroxide brings to light the influence of the precursor nature as the achievements are really diverse. With the ACs obtained from PET, a pore volume and mean pore size reduction occurred, with the AC-cloth no textural effect was observed and with the AC obtained from cork, an enlargement of the mean pore size and an increase of the pore volume were confirmed. The difference in the acidic/basic character exhibited by the modified ACs was in agreement with the presence of acidic/basic superficial groups identified by FTIR. The textural and chemical properties of the ACs affect in a direct way the phenolic compounds removal capacity. Particularly, those modified with urea, which exhibited a superior removal capacity for both phenolic compounds.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The influence of the activated carbon post-treatment on the phenolic compounds removal

Cansado

Mourão

Falcão

et al. 2012

Fuel Processing Technology

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“…Blanco-Martinez et al, 2009;Kiran & Chandrajit, 2011;Massol-Deya & Ning-His Tang, 1996;Zh. Liang, 2009;McLaren & Farguhar, 1973;Gala & Sanak-Rydlewska, 2011).…”

Section: Materials and Wastewater Used In Laboratory Testsmentioning

confidence: 99%

In-Situ Treatment of Groundwater Contaminated With Underground Coal Gasification Products / Oczyszczanie in-Situ Wód Podziemnych Zanieczyszczonych Przez Produkty Podziemnego Zgazowania Węgla

Suponik¹,

Lutyński²

2013

Archives of Mining Sciences

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In the paper the contaminants that may be generated in Underground Coal Gasification (UCG) process were listed and include mainly mono-and polycyclic aromatic hydrocarbons, phenols, heavy metals, cyanides, ammonium, chloride and sulphate. As a method of UCG contaminated groundwater treatment a Permeable Reactive Barrier technology was proposed. To assess the effectiveness of this technology two tests were carried out. Granulated activated carbon (GAC) and zeolite, and granulated activated carbon and scrap iron were applied in the first and second test respectively. For these materials the hydro geological parameters called reactive material parameters were determined and discussed. The results of the experiments showed that GAC seems to be the most effective material for phenols, BTX, PAH, cyanides and slightly lowers ammonia removal, while zeolites and scrap iron removed free cyanide, ammonia and heavy metals respectively. Keywords: Underground Coal Gasification, underground water, contaminants treatment, reactive barrier Podziemne Zgazowanie Węgla (PZW) jest alternatywną metodą pozyskiwania energii z węgla. Jest to zespół przemian termicznych i chemicznych przebiegających bezpośrednio w złożu węgla, zachodzących pomiędzy substancją organiczną a czynnikiem zgazowującym, jakim może być powietrze, tlen, para wodna, dwutlenek węgla. Poza wieloma zaletami metoda ta niesie za sobą także wiele zagrożeń, które były rozważane w ramach projektu HUGE 2 (nr RFCR-CT-2011-00002). Jednym z nich jest zagrożenie środowiska wód podziemnych produktami PZW, do których należą wielopierścieniowe węglowodory aromatyczne, BTX, fenole, metale ciężkie, cyjanki, jony amonowe, chlorki i siarczany. W celu zminimalizowania tego zagrożenia w pracy rozważono zastosowanie w obszarze reaktora PZW technologii Przepuszczalnej Bariery Reaktywnej (PRB). W technologii tej zanieczyszczenia usuwane są in-situ poprzez przepływ wód przez odpowiednio dobrany materiał reaktywny. W tablicy 1 przedstawiono podstawowe parametry bariery, które należy określić, aby skutecznie i długotrwale chronić środowisko wodne przed zanieczyszczeniami. Jako materiał reaktywny w pracy wybrano, na podstawie zdolności oczyszczania, granulowany węgiel aktywny (do usuwania związków organicznych) oraz żelazo metaliczne i alternatywnie zeolity (do usuwania

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“…A detailed description of the DFT approach to the pore size analysis can be found elsewhere. [34][35][36][37][38] Briefly, the evaluation of PSD is based on the theoretical isotherms calculated for individual pores of a given adsorbate-adsorbent system. These isotherms, which constitute the so-called kernel, are generated using the NLDFT where the fundamental molecular parameters characterising the gas-gas and gas-solid interactions of the adsorption system are utilised.…”

Section: Physical Properties Of Activated Carbonsmentioning

confidence: 99%

Immersion Calorimetry Applied to the Study of the Adsorption of Phenolic Derivatives onto Activated Carbon Obtained by Pyrolysis of Potato Peel

Moreno–Piraján¹,

Giraldo²

2012

Mat Express

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Activated carbons (ACs) were prepared by pyrolysis of potato peel in the presence of zinc chloride (chemical activation). Room-temperature adsorption of phenol, p-cresol, p-chlorophenol and p-nitrophenol from aqueous solutions at room temperature was investigated. Experimental results show that adsorption capacity depends on carbon surface area and porosity, on the solubility of the different phenolic compounds and on the hydrophobicity of the substituent. The relative affinity of the phenolic compounds towards the carbon surface was correlated to the electron donor-acceptor complexes which are formed between the basic sites on the carbon surface and the aromatic ring of the phenol compounds. As a result, the adsorption capacity began to decrease at a pH value that depended on the difference between the external and internal surface charge density, as measured by electrophoresis and the pH of the slurry, respectively. Eventually, immersion enthalpy was determined for each carbon sample. The values always increase with the relative amount adsorbed at equilibrium (Q e , ranging between 23.5 and 65.4 J/g. Activated carbons with lower total acidity contents show the lowest values, this being related to the different activation treatments carried out by zinc chloride.

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Effect of the pH in the adsorption and in the immersion enthalpy of monohydroxylated phenols from aqueous solutions on activated carbons

Cited by 55 publications

References 34 publications

The influence of the activated carbon post-treatment on the phenolic compounds removal

The influence of the activated carbon post-treatment on the phenolic compounds removal

In-Situ Treatment of Groundwater Contaminated With Underground Coal Gasification Products / Oczyszczanie in-Situ Wód Podziemnych Zanieczyszczonych Przez Produkty Podziemnego Zgazowania Węgla

Immersion Calorimetry Applied to the Study of the Adsorption of Phenolic Derivatives onto Activated Carbon Obtained by Pyrolysis of Potato Peel

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