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Removal of 3—(3,4—dichlorophenyl)—1, 1 dimethylurea from aqueous solution by natural and activated bentonite
Author(s) -
GonzálezPradas E.,
VillafrancaSánchez M.,
SociasViciana M.,
CastilloSánchez J.,
FernándezPérez M.
Publication year - 1993
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280560112
Subject(s) - bentonite , adsorption , aqueous solution , freundlich equation , chemistry , nuclear chemistry , chromatography , organic chemistry , chemical engineering , engineering
The adsorption of 3‐(3,4‐dichlorophenyl)‐1,1 dimethylurea (diuron) on bentonite desiccated at 110°C untreated, and acid treated with H 2 SO 4 solutions over a concentration range between 0.25 M and 5.00 M, from aqueous solution at 30°C has been studied. In addition, adsorption of diuron on combined acid/heat treated samples (0.50 M and 2.50 M H 2 SO 4 /200°C and 400°C) has also been studied. The experimental data points have been fitted to the Freundlich equation in order to calculate the adsorption capacities (K) of the samples; K values range from 0.92 μg g −1 for the untreated bentonite up to 974.42 μg g −1 for the 0.50 M H 2 SO 4 /400°C acid/heat treated bentonite. The removal efficiency (R) has also been calculated; R values ranging from 2.02% for the untreated bentonite up to 97.17% for the 0.50 M H 2 SO 4 /400°C acid/heat treated bentonite. The adsorption experiments show that bentonite heat treatment is more effective than bentonite acid treatment in relation to adsorption of diuron.