Effect of soil composition and dissolved organic matter on pesticide sorption.

Development of magnetic activated carbon from almond shells for trinitrophenol removal from water

We report here a systematic XRD/FTIR/CHN/ICP investigation for structural transformation of hydrotalcite-like compounds Mg1-xAlx(OH)2(NO3)x·nH2O as a continuous function of nitrate anions (x = 0.18−0.34). With seven finely divided steps in x value, a clear relationship between basal spacing and nitrate anion content (and thus trivalent cation content) has been found. In particular, we have been able to “arrest” an intermediate hydrotalcite-like phase that situates at the midpoint of an abrupt structural transformation. Unlike that of normal hydrotalcites, the relationship revealed in our nitrated Mg1-xAlx(OH)2(NO3)x·nH2O samples is much more complicated. While the lattice parameter a decreases with increase of nitrate content, the parameter c decreases slightly over x = 0.18−0.22, rises abruptly with a further increase of nitrate anions at x = 0.26, and then reaches maximums at x = 0.31−0.34. The compound at x = 0.26 also shows a sharp decrease in mean crystallite dimension. The abrupt structural change i...

Abrupt Structural Transformation in Hydrotalcite-like Compounds Mg1-xAlx(OH)2(NO3)x·nH2O as a Continuous Function of Nitrate Anions

Selenium adsorption on Mg–Al and Zn–Al layered double hydroxides

Organo and inorgano-organo-modified clays in the remediation of aqueous solutions: An overview

Hydrotalcite as sorbent for trinitrophenol: Sorption capacity and mechanism

Hydrotalcite-like compounds as potential sorbents of phenols from water

The interaction of the herbicide 2,4-dieblorophenoxyacetic acid (2,4-D) with decylammonium-montmorillonite (C10M) and decylammonium-vermiculite (C10V) was studied by measuring 2,4-D adsorption at different pH levels, and by preparing herbicide-organic clay complexes which were characterized by x-ray diffraction (XRD) and former transform infrared spectroscopy (FT-IR). The adsorption of 2,4-D at different pH values indicated that the undissociated form was preferentially adsorbed on C10M, whereas the anionic form was adsorbed by C10V. The adsorption of 2,4-D was much greater for C10V than for C10M. X-ray diffraction diffractograms and FT-IR spectra of C10M did not show any changes after exposure to 2,4-D, indicating adsorption on external surfaces by weak lyopbilic, aromatic ring-alkylchain(tail), bond.

M.C. Hermosín

Papers

Hydrotalcite as sorbent for trinitrophenol: Sorption capacity and mechanism

Hydrotalcite-like compounds as potential sorbents of phenols from water

Binding mechanism of 2,4-dichlorophenoxyacetic acid by organo-clays

Removing 2,4-D from water by organo-clays