Sorption of the ionizable pesticide imazamox by organo‐clays and organohydrotalcites

Celis, R.; Koskinen, William C.; Cecchi, A. M.; Bresnahan, Gail A.; Carrisoza, M. J.; Ulibarri, M.A.; Pavlović, I.; Hermosı́n, M.C.

doi:10.1080/03601239909373237

Cited by 65 publications

(47 citation statements)

References 17 publications

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“…The band at 1730 cm Ϫ1 for dicamba-SAz-HDTMA was assigned to the CϭO strectching vibration of the protonated carboxylic group of dicamba and indicates that sorption involved the undissociated form of dicamba. In addition, a shift of CϭO of the carboxylic group from 1711 to 1730 cm Ϫ1 also suggests the presence of monomeric molecules in an undissociated form (Zhao et al, 1996). This mechanism supports the reversibility observed in the sorption- In the case of ODA, a strong diminution of the free…”

Section: Materials and Methods Nium (Hdtma)-exchanged Arizona Montmorsupporting

confidence: 72%

Interactions of Acidic Herbicides Bentazon and Dicamba With Organoclays

Carrizosa¹,

Koskinen²,

Hermosı́n

2004

Soil Science Soc of Amer J

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We determined the sorption mechanism of the acidic herbicides bentazon [3‐(1‐methylethyl)‐1H‐2,1,3‐benzothiadiazin‐4(3H)‐one 2,2‐dioxide] and dicamba (3,6‐dichloro‐2‐methoxybenzoic acid) on two organoclays, octadecylammonium (ODA)‐ and hexadecyltrimethylammonium (HDTMA)‐exchanged Arizona montmorillonite (SAz‐1), as part of a study to determine their potential use as sorbent materials for ionizable organic pollutants. To determine the mechanisms involved in the sorption process, herbicide‐organoclay complexes were characterized by x‐ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). In general, the d001 values of SAz‐HDTMA and SAz‐ODA organoclays expanded after herbicide saturation, indicating interlayer sorption of the herbicide. Also, FTIR spectroscopic studies suggested weak hydrophobic interactions between these herbicides and the interlayer organic phase of the organoclays. However, H bonding between these herbicides and the monosubstituted amino group in SAz‐ODA reinforced the strength of the hydrophobic interactions resulting in nonreadily reversible sorption on that organoclay. These results suggest that organoclays can be used to remove this type of pollutants from water or soils.

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Section: Materials and Methods Nium (Hdtma)-exchanged Arizona Montmorsupporting

confidence: 72%

Interactions of Acidic Herbicides Bentazon and Dicamba With Organoclays

Carrizosa¹,

Koskinen²,

Hermosı́n

2004

Soil Science Soc of Amer J

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“…At low pH, 4-CP presents the neutral form, which shows higher adsorption affinity onto BXT and BXT-HDTMA than the anionic, because the organic phase acts as an efficient partition medium for the uptake of neutral 4-CP at acidic conditions 31 . …”

Section: Influence Of Ionic Strengthmentioning

confidence: 99%

Adsorption of 4-Chlorophenol from Aqueous Solution Onto Iraqi Bauxite and Surfactant–Modified Iraqi Bauxite: Equilibrium, Kinetic, and Thermodynamic Studies

Al-Kazragi¹,

Al-Heetimi²,

Himdan³

2017

Orient. J. Chem

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Natural Bauxite (BXT) mineral clay was modified with a cationic surfactant (hexadecy ltrimethy lammonium bromide (BXT-HDTMA)) and characterized with different techniques: FTIR spectroscopy, X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The modified and natural bauxite (BXT) were used as adsorbents for the adsorption of 4-Chlorophenol (4-CP) from aqueous solutions. The adsorption study was carried out at different conditions and parameters: contact time, pH value, adsorbent dosage and ionic strength. The adsorption kinetic (described by a pseudo-first order and a pseudo-second order), equilibrium experimental data (analyzed by Langmuir, Freundlich and Temkin isotherm models) and thermodynamic parameters (change in standard free energy) (ΔG°), standard enthalpy (ΔH°), and standard entropy (ΔS°)) were investigated and determined. Beside the advantages and properties of BXT-HDTMA (effective and low-cost adsorbent), the adsorption study revealed that the modification of natural bauxite (BXT) with hexadecy ltrimethy lammonium bromide has enhanced its adsorption capacity (eight to ten times greater comparison with the natural Bauxite).

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“…In addition, natural porous materials that can be used as pesticide carriers in controlled-release formulations, such as zeolite (Zhang et al, 2006) and some swelling clay minerals, e.g., montmorillonite (Celis et al, 1999(Celis et al, , 2002Carrizosa et al, 2000;Hermosin et al, 2001Hermosin et al, , 2006Undabeytia et al, 2013) and hydrotalcite (Celis et al, 1999;Bruna et al, 2008), have attracted considerable attention. Natural zeolites and clay minerals have several advantages for use as pesticide carriers: (i) in comparison with synthetic porous materials, these natural minerals are readily available at low cost because of their abundant deposits; (ii) they are environmentally friendly because they are common soil constituents; and (iii) the loading of pesticides on these carriers is readily achieved via simple adsorption and/or ion exchange because they normally possess high ion-exchange capacity.…”

Section: Introductionmentioning

confidence: 99%

“…Natural zeolites and clay minerals have several advantages for use as pesticide carriers: (i) in comparison with synthetic porous materials, these natural minerals are readily available at low cost because of their abundant deposits; (ii) they are environmentally friendly because they are common soil constituents; and (iii) the loading of pesticides on these carriers is readily achieved via simple adsorption and/or ion exchange because they normally possess high ion-exchange capacity. Some ionic pesticides, such as imazamox (Celis et al, 1999), glyphosate (Zhang et al, 2004), and paraquat (Zhang et al, 2006), investigated in related studies with zeolites and clay minerals used as carriers, have exhibited excellent loading and controlled-release behavior. However, much less effort has been paid to the investigation of the loading of nonionic pesticides on zeolite and clay minerals because such pesticides cannot be loaded via ion exchange.…”

Section: Introductionmentioning

confidence: 99%