Study on behavior of alkalescent fiber FFA-1 adsorbing glyphosate from production wastewater of glyphosate

Zhou, Cai-Rong; Li, G.P.; Jiang, Deng Gao

doi:10.1016/j.fluid.2013.09.002

Cited by 12 publications

(3 citation statements)

References 10 publications

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“…ΔG° values are also negative, except for the temperature of 5°C, indicating that the glyphosate adsorption by GAC/Mn/Fe is a spontaneous process. By increasing temperature, ΔG° values become more negative, suggesting that glyphosate adsorption becomes more thermodynamically favored and feasible (Zhou et al, 2014).…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

Activated carbon loaded with manganese and iron for glyphosate adsorption: Kinetics, isotherms and thermodynamic studies

2019

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Granular activated carbon was loaded with 0.5% manganese and 1.0% iron (m/m) for glyphosate removal from aqueous solutions. The adsorbent material was characterized by scanning electron microscopy, dispersive energy spectrometry, nitrogen adsorption techniques and zeta potential analyses. Batch studies were performed to investigate the adsorption equilibrium, kinetics mechanisms and to obtain thermodynamic information. Glyphosate adsorption increased with the contact time and achieved equilibrium within 24 h, with a maximum adsorption capacity of 9.19 mg g-1 at 45°C. Batch kinetic experimental data obeyed the pseudo-second-order model with R2>0.99. Adsorption isotherm experiments were carried out at 5, 15, 25, 35 and 45°C. The adsorption isotherms presented a better fitting using the Freundlich model (R2>0.98), indicating a multilayer adsorption of glyphosate. Thermodynamics studies showed that the adsorption of glyphosate onto granular activated carbon loaded with manganese and iron was spontaneous and feasible with negative values of ΔG°, endothermic with ΔH° of 20.924 kJ mol-1 and ΔS° of -73.250 J mol-1 K-1, suggesting a decrease in randomness at the solid–liquid interface between glyphosate and the adsorbent. The experimental results demonstrated that activated carbon loaded with manganese and iron may be an alternative for glyphosate removal in water, wastewater treatment and purification processes.

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Section: Thermodynamic Parametersmentioning

confidence: 99%

Activated carbon loaded with manganese and iron for glyphosate adsorption: Kinetics, isotherms and thermodynamic studies

2019

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“…In the adsorption tests, both agitation speed and pH exerted a polynomial (quadratic) influence on glyphosate removal (Figure 1). Although the adsorption efficiency was not directly proportional to the increase in agitation speed, it was possible to identify optimal speeds of 170 and 230 rpm for the process, which suffered a loss in efficiency at a speed of 250 rpm, showing that the operation is efficient even at lower agitation speeds, which allows energy savings (Zhou et al, 2014). Even the increase in speed can cause the breakage of the particles of the compounds and the increase of desorption, which makes the process unfeasible (Omri et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Low-cost sorbent for removing glyphosate from aqueous solutions for non-potable reuse

Melo

Naval

2023

Rev. ambiente água

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This study aimed to determine the removal of glyphosate from aqueous solutions by adsorption with pulverized activated carbon, considering the possibility of including this method as an effluent treatment to be adopted for non-potable reuse. Pareto analysis techniques and response surface analysis were used to evaluate the efficiency and conditions of the process and its effects. The adsorbent used was Biocarbon PVU Tobasa, pulverized activated carbon, manufactured by Tobasa Bioindustrial de Babaçu S.A, from the endocarp of the babassu coconut (Attalea ssp) through a process of physical activation with water vapor. The adsorption tests were carried out keeping the initial concentration of the pesticide at 79.5 mg/L. The results show the effects of the correlated variables, obtaining the optimization of the experimental data, reaching the removal efficiency of approximately 60% of the glyphosate, for an adsorbent dosage of 3.2 g, pH 4.6 and speed of agitation 170 rpm. It is verified that activated carbon can be used as an adsorbent in the removal of glyphosate, even at high concentrations, proving to be an alternative treatment for wastewater, capable of obtaining water for non-potable reuse, regarding the presence of glyphosate. Keywords: activated carbono, adsorption of glyphosate, wastewater reuse.

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“…However, most of these remediation technologies have limited flexibility, high cost, low efficiency, and possible production of secondary pollutants [14]. In this sense, adsorption is a promising technique, characterized by low cost, design simplicity, ease of operation, and high efficiency [15,16], avoiding secondary pollution and allowing the use of numerous materials as adsorbents [17]. In addition, it presents adsorbents regeneration and reuse capacity, enabling the process in the long term [18].…”

Section: Introductionmentioning

confidence: 99%

New insights into glyphosate adsorption on modified carbon nanotubes via green synthesis: Statistical physical modeling and steric and energetic interpretations

Diel

Martinello

Silveira

et al. 2022

Chemical Engineering Journal

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Study on behavior of alkalescent fiber FFA-1 adsorbing glyphosate from production wastewater of glyphosate

Cited by 12 publications

References 10 publications

Activated carbon loaded with manganese and iron for glyphosate adsorption: Kinetics, isotherms and thermodynamic studies

Activated carbon loaded with manganese and iron for glyphosate adsorption: Kinetics, isotherms and thermodynamic studies

Low-cost sorbent for removing glyphosate from aqueous solutions for non-potable reuse

New insights into glyphosate adsorption on modified carbon nanotubes via green synthesis: Statistical physical modeling and steric and energetic interpretations

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