Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies

Marco-Brown, Jose L.; Areco, María Mar; Sánchez, Rosa M. Torres; Afonso, Marı́a dos Santos

doi:10.1016/j.colsurfa.2014.02.038

Cited by 55 publications

(36 citation statements)

References 38 publications

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“…This, together with the fact that the herbicide has an anionic character, may have contributed to its molecules leaching process. Marco-Brown et al (2014) reinforce this assumption by emphasizing that picloram exhibits an anionic character in most soils because it has an acid nature (pKa ≈ 2.3), which reduces its adsorption capacity to reactive materials, such as clay and organic matter (Vieira et al, 1998). Results obtained in the leaching tests corroborate these authors since the soil used presents low organic matter content and pH higher than 6.5.…”

Section: Picloram + 24-d Leaching Testsupporting

confidence: 77%

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Biosolids in Leaching of Herbicides Mimicking Auxin in Tropical Soils

et al. 2018

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-Biosolids are residues from the treatment of urban fluids used as a source of nutrients for agricultural and forestry crops. The organic matter contained in this residue and its chemical characteristics may interfere with the behavior of herbicides in the soil. The objective of this study was to evaluate the influence of biosolids on the potential for leaching herbicides mimicking auxin. Two simultaneous experiments were performed: a leaching test of picloram + 2.4-D in soil column with addition of thermally treated biosolids or solarized biosolids and another one to evaluate the effect of leachate application from the leaching tests under inert material. Each type of biosolid was incorporated in sandy soil in the proportions of 0%, 50%, 100% and 150% of the maximum recommended dose for subsurface fertilization for eucalyptus. The soil was conditioned in PVC columns and the herbicide columns based on picloram + 2.4-D (Turuna® Commercial Formulation), corresponding to 240 g L -1 of 2.4-D + 64 g L -1 of picloram at a dose of 3.5 L ha -1 of the commercial product. The columns were submitted to rain simulation and the resulting leachate was collected, followed by its application in sand-filled pots. The Cucumis sativus was sown along the profile of the soil columns and in the pots. The incorporation of the biosolid, independently of the type and dose tested did not interfere in the leaching potential of picloram + 2.4-D. Symptoms of intoxication were observed along all soil columns and pots. Therefore this residue is not very effective for the resolution of environmental problems caused by the leaching of auxin-mimicking herbicides in the soil. Keywords

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Section: Picloram + 24-d Leaching Testsupporting

confidence: 77%

“…As for Marco-Brown et al (2014), they have observed considerable adsorption of picloram on clay material in medium with pH higher than 3.…”

Section: Picloram + 24-d Leaching Testmentioning

confidence: 99%

Biosolids in Leaching of Herbicides Mimicking Auxin in Tropical Soils

et al. 2018

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“…Adsorbent materials such as activated carbon (Huang et al 2008;Shao et al 2013;Ding et al 2014), resins (Pan et al 2006), montmorillonite (Almeida et al 2009;Ye and Lemley 2009;Xue et al 2013;Marco-Brown et al 2014), organoclay (Ko et al 2007), chitosan (Ngah and Fatinathan 2006), mineral waste from coal mining (Almeida et al 2010), nanoparticles (Jing et al 2013), cotton fibres (Liu et al 2014a, b), magnetic adsorbents (Ma et al 2014), montmorillonite clay modified with iron (Cottet et al 2014), among others, have been used in order to remove PNP and other contaminants from aqueous solutions. In contrast, peat is an alternate, low-cost biosorbent of high porosity that does not require activation and is feasible in many tropical countries, including Brazil (Fernandes et al 2007(Fernandes et al , 2011Rovani et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Removal of p-Nitrophenol from Aqueous Solution Using Brazilian Peat: Kinetic and Thermodynamic Studies

Jaerger

Santos

Fernandes

et al. 2015

Water Air Soil Pollut

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Removal of p-nitrophenol (PNP) from aqueous solutions using fibrous peat has been investigated in this study by batch adsorption experiments. Factors that can affect the adsorption process, such as pH, temperature, initial PNP concentration and contact time, have been investigated. Fourier transform infrared (FTIR) and thermogravimetric analysis (TGA) measurements have also been obtained in order to study the adsorption mechanism of PNP by peat. The Langmuir and Freundlich equations have been applied to investigate the equilibrium. The data fitted the Langmuir isotherm well, with the maximum adsorption capacity decreasing with temperature from 23.4 to 16.1 mg g −1 . In general, the adsorption equilibrium was attained within 100 min. For the kinetics study, the best fit was obtained by the pseudo-second-order model instead of the pseudo-firstorder model, both of which applied to the experimental data, whereas the results of intraparticle diffusion show a two-step adsorption process. The activation energy value of 70.31 kJ mol −1 , calculated from the Arrhenius equation, indicated a predominantly chemical adsorption, whereas the thermodynamic parameters, obtained by the van't Hoff equation, were exothermic and spontaneous in nature.

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“…The intra particle diffusion model could represent the adsorption kinetic data quite well for several systems such as congo red-nano clay filled composite hydrogels and methyl violet-nano clay filled composite hydrogels (Bhattacharyya and Ray 2015), Basic yellow 28-amidated pectin/montmorillonite composite (Nesic et al 2014), Rhodamine 6G-chitosan-g-(N-vinyl pyrrolidone)/montmorillonite composite (Vanamudan et al 2014), Cobalt(II)-chitosan-montmorillonite (Wang et al 2014), Indigo carmine-CdSe montmorillonite composite (Chikate and Kadu 2014), picloram herbicide-montmorillonite (Marco-Brown et al 2014), phenol and cathecol-gemini surfactant modified montmorillonite …”

Section: Intraparticle Diffusion Modelmentioning

confidence: 99%

“…The intraparticle diffusion model is applicable when the rate-determining step is the mass transfer of adsorbate to the solid surface sites (Marco-Brown et al 2014). When the ratio of q t /q e is less than 0.3, the Eq.…”

Section: Intraparticle Diffusion Modelmentioning

confidence: 99%

The Kinetic Studies in the Adsorption of Hazardous Substances Using Clay Minerals

Ismadji

Soetaredjo

Ayucitra

2015

SpringerBriefs in Molecular Science

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For the design of the adsorption system, reliable adsorption kinetic data are required. Different concepts are employed to develop a reliable adsorption kinetic model. Most of the available models were developed according to mass transfer principles or the concept of chemical reaction occurring on the surface of a solid. The models based on the surface-reaction kinetic step as controlling the sorption rate have also been proposed, these models include pseudo-first order kinetic (also called as Lagergren model), pseudo-second order kinetic, and Elovich equation. This chapter discusses various aspects of pseudo-first order kinetic and pseudo-second order kinetic in representing the adsorption kinetic data of some hazardous compounds onto clay minerals. The pseudo-first order kinetic is the earliest known equation to describe the rate of sorption in the liquid phase system. The behavior of time constant parameters k 1 and k 2 of pseudo-first order kinetics and pseudo-second order kinetics as a function of initial concentration as well as the temperature is discussed in this chapter. One of the kinetic models which also widely used to represent the sorption kinetic data is an intraparticle diffusion model also briefly discussed in this chapter.Keywords Adsorption kinetic · Pseudo-first · Pseudo-second · Intraparticle diffusion Adsorption kinetics are expressed as the solute removal rate that controls the residence time of the solute in the solid-solution interface. Reliable sorption kinetic data are of substantial value for adsorption separation system design. Various models have been developed to adequately describe the kinetics of sorption of the solid-liquid system. However, due to its complexity compared to the description of adsorption equilibria, the progress of development of various sorption kinetics appears to be limited. In general, the adsorption of solute from aqueous solution

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Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies

Cited by 55 publications

References 38 publications

Biosolids in Leaching of Herbicides Mimicking Auxin in Tropical Soils

Biosolids in Leaching of Herbicides Mimicking Auxin in Tropical Soils

Removal of p-Nitrophenol from Aqueous Solution Using Brazilian Peat: Kinetic and Thermodynamic Studies

The Kinetic Studies in the Adsorption of Hazardous Substances Using Clay Minerals

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