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Potential effect of chemical and thermal treatment on the Kinetics, equilibrium, and thermodynamic studies for atrazine biosorption by the Moringa oleifera pods
Author(s) -
Coldebella Priscila Ferri,
FagundesKlen Márcia Regina,
Nishi Letícia,
Valverde Karina Cardoso,
Cavalcanti Eliane Bezerra,
Andreo dos Santos Onélia Aparecida,
Bergamasco Rosângela
Publication year - 2017
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22756
Subject(s) - biosorption , atrazine , chemistry , adsorption , freundlich equation , moringa , langmuir , langmuir adsorption model , nuclear chemistry , environmental chemistry , pesticide , food science , sorption , biology , agronomy , organic chemistry
The effectiveness of chemical and thermal pretreatments on Moringa oleifera pods for the atrazine removal from water was investigated. The untreated pods (MOP un ), the chemically treated pods (MOPC), and the chemically treated pods followed by the thermally treated pods (MOPT) were physico‐chemically and morphologically characterized by elemental, pH ZPC , N 2 physisorption, FTIR, and SEM analysis. The effect of modified pods was significant in increasing surface porosity, favouring the surface chemistry, and improving the atrazine biosorption capacity. Kinetics data were best explained by pseudo‐second order model for all biosorbents. The equilibrium data for biosorption were analyzed by using Langmuir, Freundlich, Sips, and Polanyi‐Manes (PMM) isotherm models to define the best correlation for atrazine biosorption capacity. Among the four isotherm models, both Sips and PMM were the models best fitted with the equilibrium isotherm for atrazine. The maximum atrazine adsorption capacities were 0.629, 1.580, and 7.47 mg · g −1 for MOP un , MOPC, and MOPT respectively with a maximum removal percentage of 65 %, 82 %, and 99 %. The thermodynamic studies showed that atrazine biosorption is favourable. The biosorption experiments demonstrated that Moringa oleifera pods have great potential for removing atrazine and other organic contaminants from water.