Study of Sorption Kinetics and Sorption–Desorption Models to Assess the Transport Mechanisms of 2,4-Dichlorophenoxyacetic Acid on Volcanic Soils

The sorption behavior of 2,4-dichlorophenoxyacetic acid (2,4-D) in the abundant agricultural volcanic ash-derived soils (VADS) is not well understood despite being widely used throughout the world, causing effects to the environment and human health. The environmental behavior and risk assessment of groundwater pollution by pesticides can be evaluated through kinetic models. This study evaluated the sorption kinetics and 2,4-D sorption–desorption in ten VADS through batch sorption experiments. Differences in the sorption extent for the fast and slow phases was observed through the IPD model where 2,4-D sorption kinetics was controlled by external mass transfer and intra organic matter diffusion in Andisols (C1 ≠ 0). We confirmed from the spectroscopic analysis that the carboxylate group directly drives the interaction of 2,4-D on Andisol soil. The MLR model showed that IEP, FeDCB, and pH×Silt are important soil descriptors in the 2,4-D sorption in VADS. The Freundlich model accurately represented sorption equilibrium data in all cases (Kf values between 1.1 and 24.1 µg1−1/n mL1/ng−1) with comparatively higher sorption capacity on Andisols, where the highest hysteresis was observed in soils that presented the highest and lowest OC content (H close to 0).

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Ultrasound–acid modified Merremia vitifolia biomass for the biosorption of herbicide 2,4-D from aqueous solution

Water Science & Technology ◽

10.2166/wst.2020.346 ◽

2020 ◽

Author(s):

Meethale Theruvinthalakkal Aswani ◽

Manoj Yadav ◽

Amgoth Vinod Kumar ◽

Shashank Tiwari ◽

Tarun Kumar ◽

...

Keyword(s):

Electrostatic Interactions ◽

Entropy Change ◽

Dichlorophenoxyacetic Acid ◽

Order Kinetic ◽

Biosorption Capacity ◽

Diffusion Limitations ◽

Initial Ph ◽

Equilibrium Data ◽

Batch Biosorption ◽

2,4 Dichlorophenoxyacetic Acid

Abstract In this work, a biosorbent was prepared by the ultrasound–acid treatment of Merremia vitifolia plant and tested for the removal of 2,4-dichlorophenoxyacetic acid (2,4-D), a phenoxy herbicide. Optimal values of five batch biosorption parameters namely stirring speed, contact time, biosorbent dosage, initial pH and initial adsorbate concentration were experimentally obtained in sequential manner for an enhanced biosorption capacity. The kinetics of the biosorption of 2,4-D were best described by the pseudo first order kinetic model (R2 = 0.99) and the biosorption equilibrium data was successfully fitted to the Langmuir adsorption isotherm (R2 = 0.99) with a maximum biosorption capacity of 66.93 mg g−1. The mechanism of biosorption was investigated using two intraparticle diffusion models (Weber and Boyd), Dubinin–Radushkevich isotherm model and electrostatic interactions. The presence of intraparticle and film diffusion limitations for the biosorption was confirmed along with the physical and chemical nature of the biosorption. The thermodynamic parameters of the biosorption were calculated using the equilibrium data obtained at four different temperatures. The entropy change for biosorption was found to be negative indicating the decreased randomness at the interface. Desorption studies were carried out using different solvents and the percentages of desorption were compared.

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Sorption Kinetics of 2,4-Dichlorophenoxyacetic Acid in Selected Agricultural Soils of Malaysia

Research Journal of Environmental Toxicology ◽

10.3923/rjet.2011.39.48 ◽

2011 ◽

Vol 5 (1) ◽

pp. 39-48 ◽

Cited By ~ 4

Author(s):

B.S. Ismail ◽

Mehdi Sameni ◽

M. Halimah

Keyword(s):

Agricultural Soils ◽

Sorption Kinetics ◽

Dichlorophenoxyacetic Acid ◽

2,4 Dichlorophenoxyacetic Acid ◽

Kinetics Of

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Sorption studies of Cd and Cu on Brazilian alluvial soils

Ambiente e Agua - An Interdisciplinary Journal of Applied Science ◽

10.4136/ambi-agua.2717 ◽

2021 ◽

Vol 16 (4) ◽

pp. 1

Author(s):

Vitor Hugo de Oliveira Barros ◽

Artur Paiva Coutinho ◽

Adriana Thays Araújo Alves ◽

Severino Martins dos Santos Neto ◽

Fernando Xavier de Assis ◽

...

Keyword(s):

Heavy Metals ◽

Contaminant Transport ◽

Sorption Isotherms ◽

Sorption Kinetics ◽

Metal Mobility ◽

Sorption Behavior ◽

Transport Mechanisms ◽

Alluvial Aquifers ◽

Alluvial Sediment ◽

Pseudo Second Order

The Local Production Arrangement, located in the Pernambuco’s Agreste state, has been significantly developing the region's economy. Despite its importance, industrial activity has caused relevant environmental concerns regarding the disposal of textile effluents, especially from industrial laundries. This waste is made up of many chemicals, and among them are various types of heavy metals. The evaluation of the sorption behavior of contaminant transport mechanisms such as heavy metals is essential to assess the risk of contamination of alluvial aquifers. This study evaluated the sorption of heavy metals (Cu and Cd) in an alluvial sediment deposit in the Capibaribe River. Kinetics and isotherm experiments allowed the analyses of Cu and Cd sorption. Kinetics sorption showed an equilibrium tendency after 16 h for Cu and 18 h for Cd and was better described by a pseudo-second order model. The isotherm data were adjusted to the Linear, Freundlich and Langmuir models. Both linear and Freundlich models satisfactorily described sorption isotherms for the two pollutants. The metals in the study represent a risk of contamination of the groundwater of alluvial aquifers, mainly due to physicochemical attributes of the soil, such as high sand content (85%), low MO (2.1 g kg-1) and alkaline pH (8.2). The environmental conditions decrease absorption and facilitate metal mobility, greatly increasing the environmental risks inherent in pollutant leaching. Cu showed a higher affinity with the soil studied in all assays performed compared with the results of the tests for Cd.

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GADOLINIUM SORPTION ON MULTI-WALLED CARBON NANOTUBES

Contemporary Materials ◽

10.7251/comen1901035m ◽

2019 ◽

Vol 10 (1) ◽

Author(s):

Danijela Maksin ◽

Marija Vukčević ◽

Tatjana Đurkić ◽

Ivana Stanišić ◽

Tamara Bakić ◽

...

Keyword(s):

Carbon Nanotubes ◽

Petroleum Industry ◽

Fractional Power ◽

Sorption Kinetics ◽

Medical Diagnostics ◽

Sorption Behavior ◽

Nuclear Facilities ◽

Equilibrium Data ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Rare earth metals are deemed to be the materials of future due to their numerous applications including medical diagnostics, nuclear facilities, petroleum industry, etc. In this paper, multi-walled carbon nanotubes, which possess unique physicochemical properties, were evaluated as sorbents for lanthanoid gadolinium from aqueous solutions. The pH-dependent sorption behavior of Gd was studied in the pH range from 3 to 11 at room temperature (298 K). Equilibrium data over a range of initial Gd concentrations of 5−50 mg L−1 was analyzed with Langmuir, Freundlich and Redlich-Peterson models. Sorption kinetics was fitted with the pseudo-first-order, the pseudo-second-order and fractional power kinetic models.

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Sorption and biodegradation characteristics of the selected pharmaceuticals and personal care products onto tropical soil

Water Science & Technology ◽

10.2166/wst.2015.461 ◽

2015 ◽

Vol 73 (1) ◽

pp. 51-59 ◽

Cited By ~ 13

Author(s):

Mahsa Foolad ◽

Jiangyong Hu ◽

Ngoc Han Tran ◽

Say Leong Ong

Keyword(s):

Natural Organic Matter ◽

Personal Care Products ◽

Sorption Kinetics ◽

Personal Care ◽

Slight Effect ◽

Sorption Equilibrium ◽

Equilibrium Data ◽

Indigenous Microbial Community ◽

Pseudo Second Order ◽

Almost All

In the present study, the sorption and biodegradation characteristics of five pharmaceutical and personal care products (PPCPs), including acetaminophen (ACT), carbamazepine (CBZ), crotamiton (CTMT), diethyltoluamide (DEET) and salicylic acid (SA), were studied in laboratory-batch experiments. Sorption kinetics experimental data showed that sorption systems under this study were more appropriately described by the pseudo second-order kinetics with a correlation coefficient (R2) > 0.98. Sorption equilibrium data of almost all target compounds onto soil could be better described by the Freundlich sorption isotherm model. The adsorption results showed higher soil affinity for SA, following by ACT. Results also indicated a slight effect of pH on PPCP adsorption with lower pH causing lower adsorption of compounds onto the soil except for SA at pH 12. Moreover, adsorption of PPCPs onto the soil was influenced by natural organic matter (NOM) since the higher amount of NOM caused lower adsorption to the soil. Biodegradation studies of selected PPCPs by indigenous microbial community present in soil appeared that the removal rates of ACT, SA and DEET increased with time while no effect had been observed for the rest. This study suggests that the CBZ and CTMT can be considered as suitable chemical sewage indicators based on their low sorption affinity and high resistance to biodegradation.

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In Vitro Shoot Regeneration from Callus Derived from Marubakaido Apple Rootstock under Different Aluminium Concentrations

HortScience ◽

10.21273/hortsci.33.3.460e ◽

1998 ◽

Vol 33 (3) ◽

pp. 460e-460 ◽

Cited By ~ 1

Author(s):

Marisa F. de Oliveira ◽

Gerson R. de L. Fortes ◽

João B. da Silva

Keyword(s):

Shoot Regeneration ◽

Dichlorophenoxyacetic Acid ◽

Apple Rootstock ◽

Under Five ◽

Significant Difference ◽

Previously Treated ◽

2,4 Dichlorophenoxyacetic Acid ◽

In Vitro Shoot Regeneration

The aim of this work was to evaluate the organogenesis of Marubakaido apple rootstock under different aluminium concentratons. The explants were calli derived from apple internodes treated with either 2,4-dichlorophenoxyacetic acid or pichloram at 0.5 and 1.0 μM and under five different aluminium concentrations (0, 5, 10, 15, 20 mg/L). These calli were then treated with aluminium at 0, 5, 10, 15, and 20 mg/L. It was observed shoot regeneration only for those calli previously treated with pichloram. There were no significant difference among the aluminium concentrations.

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Characterization of the Reproductive Mode in Guayule In Vitro

HortScience ◽

10.21273/hortsci.33.3.483a ◽

1998 ◽

Vol 33 (3) ◽

pp. 483a-483

Author(s):

Roy N. Keys ◽

Dennis T. Ray ◽

David A. Dierig

Keyword(s):

Field Experiments ◽

Reproductive Mode ◽

Dichlorophenoxyacetic Acid ◽

Initial Field ◽

Breeding Lines ◽

Reproductive Modes ◽

Desert Southwest ◽

2,4 Dichlorophenoxyacetic Acid

Guayule (Parthenium argentatum Gray, Asteraceae) is a latex-producing perennial desert shrub that is potentially of economic importance as an industrial crop for the desert Southwest. It is known to possess complex reproductive modes. Diploids are predominantly sexual and self-incompatible, while polyploids show a range of apomictic potential and self-compatibility. This paper describes the development of a relatively rapid and simple technique for characterizing reproductive modes of breeding lines of P. argentatum. Initial field experiments were based on an auxin test used successfully to characterize reproductive mode in the Poaceae. The application of 2,4-dichlorophenoxyacetic acid inhibited embryo formation in P. argentatum, but this was not the case with other auxins tested. Results of field experiments were ambiguous because: 1) the floral structure of P. argentatum is such that auxins might not have penetrated to the ovules, and 2) there was potential self-fertilization by pollen released within isolation bags. Therefore, in vitro culture of flower heads was tested because it provided much better control of environmental conditions, growth regulator application, and pollen release. Auxin alone, or in combination with gibberellic acid or kinetin, inhibited parthenogenesis in vitro. Embryo production did not vary using two substantially different nutrient media. In vitro flower head culture using a (Nitsch and Nitsch) liquid nutrient medium without growth regulators, enabled characterization of the reproductive mode of seven breeding lines, ranging from predominantly sexual to predominantly apomictic. The results of this technique were substantiated using RAPD analyzes of progeny arrays from controlled crosses.

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The role of a metabolic intermediate in the biodegradation of inhibitory substrates

Water Science & Technology ◽

10.2166/wst.1997.0352 ◽

1997 ◽

Vol 36 (10) ◽

pp. 27-36 ◽

Cited By ~ 1

Author(s):

P. Mungkarndee ◽

S. M. Rao Bhamidimarri ◽

A. J. Mawson ◽

R. Chong

Keyword(s):

The Other ◽

Metabolic Product ◽

Dichlorophenoxyacetic Acid ◽

Mutual Inhibition ◽

Metabolic Intermediate ◽

Batch Cultures ◽

Ortho Cresol ◽

2,4 Dichlorophenoxyacetic Acid

Biodegradation of the mixed inhibitory substrates, 2,4-dichlorophenoxyacetic acid (2,4-D) and para-chloro-ortho-cresol (PCOC) was studied in aerobic batch cultures. Each substrate added beyond certain concentrations inhibited the degradation of the other. This mutual inhibition was found to be enhanced by 2,4-dichlorophenol (2,4-DCP) which is an intermediate metabolic product of 2,4-D. When 2,4-DCP accumulated to approximatelY 40 mg/l degradation of all compounds in the mixed 2,4-D and PCOC substrate system was completely inhibited. The degradation of 2,4-D and PCOC individually was also found to be inhibited by elevated concentrations of 2,4-DCP added externally, while PCOC inhibited the utilization of the intermediate.

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