Adsorption/bioadsorption of phthalic acid, an organic micropollutant present in landfill leachates, on activated carbons

[Display omitted] ► Phthalic acid adsorption is governed by dispersion and electrostatic interactions. ► The phthalic acid adsorption process is highly dependent on the solution pH. ► The presence of microorganisms during adsorption increases the adsorption yield. ► Phthalic acid removal varies as a...

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Bibliographic Details
Published in:Journal of colloid and interface science 2012-03, Vol.369 (1), p.358-365
Main Authors: Méndez-Díaz, José D., Abdel daiem, Mahmoud M., Rivera-Utrilla, José, Sánchez-Polo, Manuel, Bautista-Toledo, Isidora
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbents
Adsorption
bacteria
Charcoal - chemistry
Chemistry
electrolytes
Exact sciences and technology
General and physical chemistry
groundwater
Hydrogen-Ion Concentration
hydrophobicity
ionic strength
landfill leachates
Microorganisms
Osmolar Concentration
Phthalic acid
Phthalic Acids - isolation & purification
pollutants
Surface physical chemistry
surface water
wastewater
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
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Summary:[Display omitted] ► Phthalic acid adsorption is governed by dispersion and electrostatic interactions. ► The phthalic acid adsorption process is highly dependent on the solution pH. ► The presence of microorganisms during adsorption increases the adsorption yield. ► Phthalic acid removal varies as a function of the natural water type. This study investigated the adsorption of phthalic acid (PA) in aqueous phase on two activated carbons with different chemical natures, analyzing the influence of: solution pH, ionic strength, water matrix (ultrapure water, ground water, surface water, and wastewater), the presence of microorganisms in the medium, and the type of regime (static and dynamic). The activated carbons used had a high adsorption capacity (242.9mg/g and 274.5mg/g), which is enhanced with their phenolic groups content. The solution pH had a major effect on PA adsorption on activated carbon; this process is favored at acidic pHs. PA adsorption was not affected by the presence of electrolytes (ionic strength) in solution, but was enhanced by the presence of microorganisms (bacteria) due to their adsorption on the carbon, which led up to an increase in the activated carbon surface hydrophobicity. PA removal varies as a function of the water type, increasing in the order: ground water
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2011.11.073