Equilibrium, kinetic and thermodynamic study of diazinon adsorption from water by clay/GO/Fe3O4: Modeling and optimization based on response surface methodology and artificial neural network

Sohrabi, Negin; Mohammadi, Réza; Ghassemzadeh, Hamid Reza; Heris, Seyed Sadegh Seyedloo

doi:10.1016/j.molliq.2021.115384

“…Literature reports on the kinetic behaviour of both adsorbates show that both pesticides are adsorbed by second-order kinetics on a variety of surfaces. For example, the adsorption of diazinon on surfaces diverse as acid-activated bentonite 64 , surfactant-modified montmorillonites 65 , a magnetic composite of clay/graphene oxide/Fe 3 O 4 66 , and NH 4 Cl-induced activated carbon 67 , all proceed as pseudo second-order processes. Similarly, the adsorption of dichlorvos on coconut fibre biochar 68 , on soil surfaces 69 and on polyethyleneimine-modified fibres 70 are all second-order processes.…”

Section: Resultsmentioning

confidence: 99%

Comparative adsorptive behaviour of cow dung ash and starch as potential eco-friendly matrices for controlled organophosphorus pesticides delivery

Okafor

¹

,

Onyido

²

2022

Sci Rep

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The work reported herein explores the viability of cow dung ash (CDA) as a matrix for controlled pesticide delivery, by comparing its adsorptive characteristics towards two organophosphorus pesticides with those of starch, conventionally utilized in designing controlled pesticide delivery systems. CDA was characterized by Fourier transform infrared (FTIR) spectroscopy and powder X-ray diffraction (PXRD). Data for pesticide adsorption on the surfaces correlate well with Langmuir and Freundlich isotherms, with the former isotherm giving a slightly better fit (R2 ≥ 0.90) than the latter (R2 ≥ 0.81). Values of the adsorption parameters KL and RL indicate favourable pesticide adsorption on both surfaces. Desorption is the microscopic reverse of adsorption; both processes obey pseudo-second-order kinetics. The implication of this kinetic form is a mechanism in which adsorbate diffusion to the polymer surface and its transport into the polymer interior are important events. The isothermal and kinetic ratios, $$\frac{{K_{L}^{CDA} }}{{K_{L}^{Starch} }} = 3.8$$ K L CDA K L Starch = 3.8 and 4.0, $$\frac{{k_{2}^{CDA} }}{{k_{2}^{Starch} }} = 1.3$$ k 2 CDA k 2 Starch = 1.3 and 0.6, and $$\frac{{k_{ - 2}^{CDA} }}{{k_{ - 2}^{Starch} }} = 5.2$$ k - 2 CDA k - 2 Starch = 5.2 and 1.0 at pH 7.0 and 27 °C, compare the adsorptive behaviour of diazinon and dichlorvos, respectively, on CDA and starch. These parameters are of the same order of magnitude, signalling that CDA is as potentially viable as starch for use as a matrix for pesticide-controlled delivery.

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“…Literature reports on the kinetic behaviour of both adsorbates show that both pesticides are adsorbed by second-order kinetics on a variety of surfaces. For example, the adsorption of diazinon on surfaces as diverse as acid-activated bentonite 60 , surfactant-modified montmorillonites, 61 a magnetic composite of clay/graphene oxide/Fe3O4, 62 and NH4Clinduced activated carbon 63 all proceed as second-order processes. Similarly, the adsorption of dichlorvos on coconut fibre biochar, 64 on soil surfaces 65 and on polyethyleneimine-modified fibres 66 are all second-order processes.…”

Section: Kinetics Of the Adsorption Of Diazinon And Dichlorvos On Cda And Starch Surfacesmentioning

confidence: 99%

Towards Viable Eco-friendly Matrices for Controlled Pesticide Delivery: Adsorptive Behaviour of Cow Dung Ash and Starch Towards Organophosphorus Pesticides

2022

Preprint

0

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The work reported herein explores the viability of cow dung as a matrix for controlled pesticide delivery, by comparing its adsorptive characteristics towards two organophosphorus pesticides with those of starch, conventionally utilized in designing controlled pesticide delivery systems. Characterization of cow dung ash (CDA) was by Fourier transform infrared (FTIR) spectroscopy and powder X-ray diffraction (PXRD). Pesticide adsorption data on the surfaces correlate well with Langmuir and Freundlich isotherms, with the former isotherm giving a slightly better fit (R2 $\ge$ 0.90) than the latter (R2 $\ge$ 0.81). Values of the adsorption parameters KL and RL indicate favourable pesticide adsorption on both surfaces. Desorption is the microscopic reverse of adsorption; both processes obey pseudo-second-order kinetics, implicating a mechanism in which adsorbate diffusion to the polymer surface and its transport into the polymer interior are important events. The isothermal and kinetic ratios $\frac{{K}_{L}^{CDA}}{{K}_{L}^{Starch}}$= 3.8 and 4.0, $\frac{{k}_{2}^{CDA}}{{k}_{2}^{Starch} }$ = 1.3 and 0.6, and $\frac{{k}_{-2}^{CDA}}{{k}_{-2}^{Starch}}$ = 5.2 and 1.0 at pH 7 and 27oC, compare the adsorptive behaviour of diazinon and dichlorvos, respectively, on CDA and starch. These parameters are of the same order of magnitude, signalling that CDA is as potentially viable as starch for use as a matrix for pesticide-controlled delivery.

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“…Perturbation plots visualize how much individual factors in uence the outcome, but it was only sensitive to independent variables and lacks analysis of the interactions. To assess the impact of multiple factors on the nal outcome, use the Pareto chart [14], it fully displays the proportion of disturbances of each factor, exclude the effects of minimal interconnections, identify the importance of the main factors to the results (where the vertical axis is the percentage of in uence of each factor). As showed in Fig.…”

Section: Analysis Of the Degree Of Factors Disturbancementioning

confidence: 99%

Performance analysis of recycled carbon fiber under recycling process parameters optimized using response surface methodology

Cheng

¹

,

Wang

²

,

Zhou

³

et al. 2022

Preprint

0

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The recycling of high-performance carbon fiber from carbon fiber-reinforced polymer (CFRP) wastes have great economic value and environmental significance. Based on the principle of thermally activated oxide semiconductors, quantitative relationship model between the decomposition rate of the resin-matrix and the process parameters was established. The morphology, elements, functional groups and mechanical properties of recycled carbon fiber(rCF) were analyzed under the optimal process parameters. The results indicated that the decomposition rate of resin was positively correlated with time and temperature, and the degree of influence was significant, the effect of O2 flow rate and concentration were not significant. The influence of each factor indicates showed that temperature > time > O2 concentration > O2 flow rate. The actual decomposition rate of resin was 96.12% under temperature of 520 ℃, time of 23 min, O2 concentration of 80% and flow rate of 180 mL/min. Compared with the original carbon fiber(oCF), the surface roughness of recycled carbon fiber was increased, and there was no carbon deposition residue on the surface. The content of C element and C—C bond on the surface of rCF increased significantly, and functional group of COOH was produced, the graphite structure on the surface of carbon atomic surface change was not significant. The tensile strength of rCF was maintained above 99%, the Young's modulus was maintained at 92%, and the interfacial shear strength was maintained at 85%.

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Equilibrium, kinetic and thermodynamic study of diazinon adsorption from water by clay/GO/Fe3O4: Modeling and optimization based on response surface methodology and artificial neural network

Cited by 46 publications

References 53 publications

Comparative adsorptive behaviour of cow dung ash and starch as potential eco-friendly matrices for controlled organophosphorus pesticides delivery

Comparative adsorptive behaviour of cow dung ash and starch as potential eco-friendly matrices for controlled organophosphorus pesticides delivery

Towards Viable Eco-friendly Matrices for Controlled Pesticide Delivery: Adsorptive Behaviour of Cow Dung Ash and Starch Towards Organophosphorus Pesticides

Performance analysis of recycled carbon fiber under recycling process parameters optimized using response surface methodology

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