Study on adsorption of glyphosate (N-phosphonomethyl glycine) pesticide on MgAl-layered double hydroxides in aqueous solution.
MgAl-layered double hydroxides with different interlayer anions (nitrate, carbonate and chloride) were evaluated for their abilities to adsorb the organic pesticide glyphosate (N-phosphonomethyl glycine, Gly). The adsorption isotherms of Gly on layered double hydroxides (LDHs) nitrate were described by the Langmuir equation at lower equilibrium concentration of Gly (C(e)<1.0 mmol/L), and the Gly adsorption capacity on LDHs increased with the layer charge density, i.e. the structural Al3+/Mg2+ ratio. Gly adsorption on LDHs nitrate generally occurred through two processes, external surface adsorption and interlayer anion exchange. The adsorption amount on LDHs at C(e)=1.0 mmol/L decreased in the order of interlayer anions: Cl(-)>NO3(-)>CO3(2-).
Li
Feng
F
The Key Laboratory of Science and Technology of Controllable Chemical Reactions, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, PR China.
Wang
Yunfeng
Y
Yang
Qiaozhen
Q
Evans
David G
DG
Forano
Claude
C
Duan
Xue
X
D017607:Aluminum Compounds / Q000737:chemistry*; D000838:Anions; D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D006878:Hydroxides / Q000737:chemistry*; D017616:Magnesium Compounds / Q000737:chemistry*; D009994:Osmolar Concentration; D010575:Pesticides / Q000737:chemistry / Q000302:isolation & purification*; D010766:Phosphorylation; D012996:Solutions; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D014877:Water Pollution, Chemical / Q000517:prevention & control*; D000097797:Glyphosate
D017607:Aluminum Compounds; D000838:Anions; D005998:Glycine; D006878:Hydroxides; D017616:Magnesium Compounds; D010575:Pesticides; D012996:Solutions; D014867:Water; D014874:Water Pollutants, Chemical; D000097797:Glyphosate; C110424:aluminum magnesium oxide