Study of adsorption of organic pollutants on carbonaceus sorbents
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CULIGHIN, Elena, LUPASCU, Tudor. Study of adsorption of organic pollutants on carbonaceus sorbents. In: Ecological and environmental chemistry : - 2017, Ed. 6, 2-3 martie 2017, Chișinău. Chisinau, Republic of Moldova: Academy of Sciences of Moldova, 2017, Ediția 6, p. 214.
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Ecological and environmental chemistry
Ediția 6, 2017
Conferința "Ecological and environmental chemistry 2017"
6, Chișinău, Moldova, 2-3 martie 2017

Study of adsorption of organic pollutants on carbonaceus sorbents


Pag. 214-214

Culighin Elena, Lupascu Tudor
 
Institute of Chemistry of the Academy of Sciences of Moldova
 
Disponibil în IBN: 19 martie 2019


Rezumat

Problems associated with decontamination of polluted sites showed the necessity to develop remediation technologies that are practical, fast and deployable in a wide range of physical conditions. In response to the growing need to address environmental contamination, many technologies have been developed for the treatment of in situ and ex situ soil remediation such as dig and dump, soil vapor extraction, thermal treatment and bio-remediation. The aim of this paper is to study methods and approaches for sorption of certain organic pollutants by sorbent use. This study highlighted the removal of different organic pollutants using adsorption technique. The results of the batch studies using commercial mix of organochlorinated pesticides shows that great majority are absorbed onto activated carbon. In this study, experimental data for 2, 4’-DDT and β-HCH were fitted to the linearized sorption isotherm models: Langmuir and Freundlich. For the β-HCH sorption study, the maximum monolayer coverage capacity (Q0) from Langmuir Isotherm model was determined to be 41.66 mg/g, KL (Langmuir isotherm constant) is 0.456 l/mg, RL (the separation factor) is 0.418 indicating that the equilibrium sorption was favorable [1] and the R2 value is 0.939 proving that the sorption data fitted well to Langmuir Isotherm model. For the 2,4’-DDT sorption study, the maximum monolayer coverage capacity (Q0) from Langmuir Isotherm model was determined to be 718.39 mg/g, KL (Langmuir isotherm constant) is 1.16 l/mg, RL(the separation factor) is 0.26 indicating that the equilibrium sorption was favorable and the R2 value is 0.931 proving that the sorption data fitted well to Langmuir Isotherm model. As a result of Freundlich adsorption isotherm study, the Freundlich isotherm constant is an approximate indicator of adsorption capacity, while 1/n is a function of the strength of adsorption in the adsorption process [2]. Thus the value of 1/n for β-HCH =1.873 while n=0.534 indicating a cooperative adsorption [3]. On the other hand, the value of 1/n for 2,4’-DDT =0.545 while n=1.83 which indicates a normal adsorption that is favorable and the R2 value is 0.93.