Intercalation and controlled release of 2,4-dichlorophenoxyacetic acid using rhombohedral [LiAl2(OH)6]Cl·xH2O

Ragavan, Anusha; Khan, Aamir I.; O’Hare, Dermot

doi:10.1016/j.jpcs.2006.01.076

Cited by 22 publications

(10 citation statements)

References 16 publications

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“…The release profile obtained in this study, i.e., a high burst followed by a slow release, is similar to those previously reported in the literature that used 2,4-D as adsorbate and clay materials as adsorbents (layered double hydroxides (LDH), also called anionic clays, and others organically modified clay, for instance [53][54][55]), that were aimed to be applied as herbicide controlled release formulations. Despite the similarity, the release studies performed by Ragavan et al [53], Bashi et al [54], and Hermosín et al [55] reached equilibrium in approximately 100-1440 min (1 day), while in this work the equilibrium was not reached in the time range studied. According to the release models applied to our data (Weibull, Logistic and Makoid-Banakar), shown in Fig.…”

Section: Release Studysupporting

confidence: 86%

2,4-Dichlorophenoxyacetic acid adsorption on montmorillonite organoclay for controlled release applications

et al. 2019

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2,4-Dichlorophenoxyacetic acid (2,4-D) is one of the most used herbicides for weed control. However, the use of large concentrations of 2,4-D is dangerous and have great carcinogenic potential. Thus, this work evaluated the 2,4-D sorption behavior by an organically modified montmorillonite nanoclay using kinetic and thermodynamic approaches. Adsorption isotherms and kinetic studies, conducted under controlled temperature and pH conditions, indicated a high capacity of the nanoclay to remove 2,4-D from aqueous medium, being that the adsorption mechanism probably involved physisorption and chemisorption. Besides, thermodynamic parameters obtained showed that the adsorption was enthalpically driven for the physisorption step, with ΔH • = − 9.849 kJ mol −1. The analyses showed that 2,4-D adsorption caused a partial exfoliation of the montmorillonite structure, probably due to the high herbicide concentration utilized. Release studies of 2,4-D from the nanoclay showed that the desorption process occurred in two steps, a burst release of the 2,4-D molecules followed by a slow release. The results demonstrated by this study indicates the feasibility of the proposed system for controlled release or even water treatment applications.

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Section: Release Studysupporting

confidence: 86%

2,4-Dichlorophenoxyacetic acid adsorption on montmorillonite organoclay for controlled release applications

et al. 2019

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“…The insertion of 2,4-D occurred in the interlayer, resulting in the expansion of basal spacing from 8.9 to 20.1 Å. Previous study on the intercalation of 2,4-D into various LDH systems showed slightly different d -spacing, as the value reported is very much depending on the parameters used for the synthesis [9,31-34]. The increase in basal spacing indicated that the interlayer has been expanded in order to accommodate the 2,4-D moiety, which is bigger in size compared to the nitrate as the counter anion in the LDH.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Single, Binary and Ternary Anions of Chloride, Carbonate and Phosphate on the Release of 2,4-Dichlorophenoxyacetate Intercalated into the Zn–Al-layered Double Hydroxide Nanohybrid

et al. 2009

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Intercalation of beneficial anion into inorganic host has lead to an opportunity to synthesize various combinations of new organic–inorganic nanohybrids with various potential applications; especially, for the controlled release formulation and storage purposes. Investigation on the release behavior of 2,4-dichlorophenoxyacetate (2,4-D) intercalated into the interlayer of Zn–Al-layered double hydroxide (ZAN) have been carried out using single, binary and ternary aqueous systems of chloride, carbonate and phosphate. The release behavior of the active agent 2,4-D from its double-layered hydroxide nanohybrid ZANDI was found to be of controlled manner governed by pseudo-second order kinetics. It was found that carbonate medium yielded the highest accumulated release of 2,4-D, while phosphate in combination with carbonate and/or nitrate speeds up the release rate of 2,4-D. These results indicate that it is possible to design and develop new delivery system of latex stimulant compound with controlled release property based on 2,4-D that is known as a substance to increase latex production of rubber tree,Hevea brasiliensis.

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“…FTIR spectra for cloprop showed a broad band at 2959 cm −1 which is attributed to the O-H stretching vibration. A sharp band at 1715 cm −1 is due to the stretching of C = O and bands at 1465 and 1404 cm −1 are attributed to stretching vibrations of aromatic ring C = C. A strong band at 1277 and 1215 cm −1 were due to the symmetric and asymmetric stretching modes of C-O-C of the cloprop anions while a sharp band at 746 cm −1 is due to C-Cl stretching band of both anions [15]. The FTIR spectrum of cloprop-LDH and cloprop-ZLH synthesized using 0.2 M cloprop are also shown in Figure 2. As expected, the spectrum resembles a mixture of both FTIR spectra of cloprop and Zn/Al-LDH, indicating that both functional groups of cloprop and Zn/Al-LDH are present together, except for the peak at 1389 cm −1 and 1713 cm −1 corresponding to the nitrate anions and carboxylic group.…”

Section: Ftirmentioning

confidence: 97%

Synthesis and controlled release of cloprop herbicides from cloprop-layered double hydroxide and cloprop-zinc-layered hydroxide nanocomposites

Hashim¹,

Hussein²,

Isa³

et al. 2014

OJIC

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Two phenoxyherbicide nanocomposites, namely cloprop-layered double hydroxide and cloprop-zinclayered hydroxide nanocomposites, have been synthesized by using co-precipitation and direct reaction method. PXRD pattern showed an expansion of interlayer spacing with the value of 21.0 Å and 22.7 Å for cloprop-layered double hydroxide and cloprop-zinclayered hydroxide nanocomposite, respectively. It is evident from FTIR and elemental analyses that both nanocomposites were successfully intercalated between the interlayers of layered metal hydroxide. Controlled release of cloprop anion from interlayer of nanocomposites for both cloprop-layered double hydroxide and cloprop-zinc-layered hydroxide nanocomposite into phosphate solution was rapid initially and slow thereafter. The percentage of accumulated release of cloprop anion from cloprop-zinc-layered hydroxide nanocomposite was slightly higher than that from cloprop-layered double hydroxide nanocomposite. Kinetic behavior of cloprop release was governed by pseudo-second-order for cloprop-layered double hydroxide nanocomposite while parabolic diffusion for cloprop-zinc-layered hydroxide nanocomposite. Results from this study highlight the potential of both nanocomposites as capsulated material for controlled release of cloprop phenoxyherbicides anion.

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Intercalation and controlled release of 2,4-dichlorophenoxyacetic acid using rhombohedral [LiAl2(OH)6]Cl·xH2O

Cited by 22 publications

References 16 publications

2,4-Dichlorophenoxyacetic acid adsorption on montmorillonite organoclay for controlled release applications

2,4-Dichlorophenoxyacetic acid adsorption on montmorillonite organoclay for controlled release applications

The Effect of Single, Binary and Ternary Anions of Chloride, Carbonate and Phosphate on the Release of 2,4-Dichlorophenoxyacetate Intercalated into the Zn–Al-layered Double Hydroxide Nanohybrid

Synthesis and controlled release of cloprop herbicides from cloprop-layered double hydroxide and cloprop-zinc-layered hydroxide nanocomposites

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