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Removal of nitrophenol pesticides from aqueous solutions by layered double hydroxides and their calcined products
AbstractThe ability of MgAl layered double hydroxides (LDHs) and their calcined products to adsorb the water contaminants 2,4-dinitrophenol (DNP) and 2-methyl-4,6-dinitrophenol (DNOC) was assessed. Adsorption tests were conducted on LDHs with variable Mg/Al ratios (and variable layer charge), pH values, contact times and initial pesticide concentrations to identify the optimum conditions for the intended purpose. Adsorbents and adsorption products were characterized by X-ray diffraction and FT-IR spectroscopy as well as atomic absorption spectroscopy and thermal analyses. The amounts of pesticides removed from water were determined by UV–Vis spectrophotometry. All adsorbents except the carbonate-containing hydrotalcite possessed a very high adsorption capacity for both contaminants.
Research highlights► Adsorption of 2,4-dinitrophenol and 2-methyl-4,6-dinitrophenol is studied on LDHs. ► Mg/Al ratios, pH values, contact times and initial pesticide concentrationss are considered. ► MgAl-LDHs with interlayer chloride ions are efficient adsorbents of DNP and DNOC. ► The calcined LDHs has a higher capacity than the LDHs for the uptake of phenols pesticides.
Removal of nitrophenol pesticides from aqueous solutions by layered double hydroxides and their calcined products
AbstractThe ability of MgAl layered double hydroxides (LDHs) and their calcined products to adsorb the water contaminants 2,4-dinitrophenol (DNP) and 2-methyl-4,6-dinitrophenol (DNOC) was assessed. Adsorption tests were conducted on LDHs with variable Mg/Al ratios (and variable layer charge), pH values, contact times and initial pesticide concentrations to identify the optimum conditions for the intended purpose. Adsorbents and adsorption products were characterized by X-ray diffraction and FT-IR spectroscopy as well as atomic absorption spectroscopy and thermal analyses. The amounts of pesticides removed from water were determined by UV–Vis spectrophotometry. All adsorbents except the carbonate-containing hydrotalcite possessed a very high adsorption capacity for both contaminants.
Research highlights► Adsorption of 2,4-dinitrophenol and 2-methyl-4,6-dinitrophenol is studied on LDHs. ► Mg/Al ratios, pH values, contact times and initial pesticide concentrationss are considered. ► MgAl-LDHs with interlayer chloride ions are efficient adsorbents of DNP and DNOC. ► The calcined LDHs has a higher capacity than the LDHs for the uptake of phenols pesticides.
Removal of nitrophenol pesticides from aqueous solutions by layered double hydroxides and their calcined products
Chaara, D. (author) / Pavlovic, I. (author) / Bruna, F. (author) / Ulibarri, M.A. (author) / Draoui, K. (author) / Barriga, C. (author)
Applied Clay Science ; 50 ; 292-298
2010-08-03
7 pages
Article (Journal)
Electronic Resource
English
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