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Removal of Atrazine from Aqueous Solution by Natural and Activated Bentonite
Author(s) -
GonzálezPradas E.,
VillafrancaSánchez M.,
GallegoCampo A.,
UreñaAmate D.,
FernándezPérez M.
Publication year - 1997
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1997.00472425002600050014x
Subject(s) - atrazine , bentonite , aqueous solution , adsorption , chemistry , langmuir adsorption model , nuclear chemistry , chromatography , langmuir , chemical engineering , pesticide , organic chemistry , agronomy , biology , engineering
To evaluate the potential use of bentonite in removing atrazine [2‐chloro‐4‐ethylamino‐6‐isopropilamino‐1,3,5‐triazine] from water, the adsorption of atrazine on bentonite desiccated at 383 K untreated, and acid‐treated with H 2 SO 4 solutions over a concentration range between 0.25 × 10 3 cmol L −1 and 1.00 × 10 3 cmol L −1 , from aqueous solution at 303 K has been studied by using batch experiments. In addition, column experiments were carried out with the bentonite samples treated with the 1.00 × 10 3 cmol L −1 H 2 SO 4 [B‐A (1.00)] using two aqueous atrazine solutions at C = 5.91 mg L −1 and C = 9.78 mg L −1 concentrations. The experimental data points have been fitted to the Langmuir equation to calculate the adsorption capacities ( X m ). Values for X m ranged from 0.07 g kg −1 for the untreated bentonite up to 13.4 g kg −1 for the [B‐A (1.00)] samples. The removal efficiency ( R ) ranged from 2.71% for the B‐N up to 83.5% for B‐A (1.00). The batch experiments show that the acid‐treated bentonite is more effective than the natural bentonite in relation to the adsorption of atrazine. The column experiments show that the B‐A (1.00) sample might be reasonably used in removing atrazine, the column efficiency increasing from 47.5% for the C = 9.78 mg L −1 aqueous solution of atrazine up to 63.4% for the C = 5.91 mg L −1 one.