Single-Component and Multi-Component Metal Abatement in Water Using a Hydrogel Based on Chitosan: Characterization, Isotherm, Kinetic, and Thermodynamic Results

Vilela, Pâmela Becalli; Dalalibera, Amanda; Becegato, Valter Antônio; Paulino, Alexandre Tadeu

doi:10.1007/s11270-020-04873-8

Cited by 6 publications

(5 citation statements)

References 55 publications

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“…The analytical capabilities of SEM include X-ray-based tools, such as energy dispersive X-Ray spectroscopy (EDX). EDX can detect elements such as C, S, O, N, Na, and others that are present in hydrogels [ 85 , 86 , 87 , 88 ] and within cells (e.g., P—a marker of DNA) ( Figure 3 A). EDX is particularly useful for the recognition of cells present within hydrogels of marked structural heterogeneity ( Figure 3 B).…”

Section: Electron-based Techniquesmentioning

confidence: 99%

A Beginner’s Guide to the Characterization of Hydrogel Microarchitecture for Cellular Applications

Martínez-García

Fischer

Hayn

et al. 2022

Gels

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The extracellular matrix (ECM) is a three-dimensional, acellular scaffold of living tissues. Incorporating the ECM into cell culture models is a goal of cell biology studies and requires biocompatible materials that can mimic the ECM. Among such materials are hydrogels: polymeric networks that derive most of their mass from water. With the tuning of their properties, these polymer networks can resemble living tissues. The microarchitectural properties of hydrogels, such as porosity, pore size, fiber length, and surface topology can determine cell plasticity. The adequate characterization of these parameters requires reliable and reproducible methods. However, most methods were historically standardized using other biological specimens, such as 2D cell cultures, biopsies, or even animal models. Therefore, their translation comes with technical limitations when applied to hydrogel-based cell culture systems. In our current work, we have reviewed the most common techniques employed in the characterization of hydrogel microarchitectures. Our review provides a concise description of the underlying principles of each method and summarizes the collective data obtained from cell-free and cell-loaded hydrogels. The advantages and limitations of each technique are discussed, and comparisons are made. The information presented in our current work will be of interest to researchers who employ hydrogels as platforms for cell culture, 3D bioprinting, and other fields within hydrogel-based research.

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Section: Electron-based Techniquesmentioning

confidence: 99%

A Beginner’s Guide to the Characterization of Hydrogel Microarchitecture for Cellular Applications

Martínez-García

Fischer

Hayn

et al. 2022

Gels

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“…According to Langmuir isotherm theory, the adsorbate material assumes a single layer on a homogeneous adsorbent surface and that all sorption fields are identical and energy equivalent (Vilela et al, 2020). In Table 2, Langmuir isotherm models were determined to be compatible with the Langmuir isotherm in terms of correlation factors and values between 0.9683 ≤ R 2 ≤ 0.9905.…”

Section: Adsorption-desorption Studiesmentioning

confidence: 99%

“…Positive ΔH o values indicate that adsorption is endothermic, while negative ΔG o values indicate spontaneous adsorption. Additionally, a positive value suggests an increase in randomness at the solid-liquid interface during endosulfan adsorption onto the adsorbent (Caliskan et al, 2011;Vilela et al, 2020). Increased temperature decreases free active adsorption sites, which results in a decrease ΔG o values (Alacabey, 2022b).…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

Endosulfan Elimination Using Amine-Modified Magnetic Diatomite as an Adsorbent

Alacabey

2022

Front. Chem.

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Pesticides are among the most dangerous developing toxins since they are very hazardous to the environment and threaten human health. In this study, researchers successfully manufactured surface-modified magnetic diatomite (m-DE-APTES) and used them as a sorbent to extract endosulfan from an aqueous solution. There is no other study like it in the scholarly literature, and the results are astounding. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), electron spin resonance (ESR), and surface area measurements were used to analyze magnetic diatomite particles with surface modification. According to the analysis results, magnetic diatomite has a wide surface area and a porous structure. Furthermore, m-DE-APTES has a higher endosulfan adsorption capacity (97.2 mg g−1) than raw diatomite (DE) (16.6 mg g−1). Adsorption statistics agree with Langmuir adsorption isotherm (R2 = 0.9905), and the adsorption occurred spontaneously at −2.576 kj mol−1 in terms of ΔGo. Finally, m-DE-APTES are a viable alternative adsorbent for removing pesticides from aqueous solutions.

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“…ΔHo and ΔSo can also be calculated using equation 7. Besides, the positive value indicates an increase in randomness at the solid-liquid interface during endosulfan adsorption onto the adsorbent [47,53]. Increasing the temperature decrease free active adsorption sites that lead to the decrease ΔGo values [58].…”

Section: Kcmentioning

confidence: 99%

Amine Modified Magnetic Diatomite Particles as an Effcicent Adsorbent for Pecticide Removal

Alacabey¹

2021

Preprint

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Pesticides are one of the most critical emerging contaminants which are highly toxic for the environment and have potential risk to human health. In this study, surface-modified magnetic diatomite particles (m-DE-APTES) have been suc-cessfully synthesized and used as a sorbent for the removal of endosulfan from an aqueous solution. Magnetic diatomite particles with surface modification were characterized by Fourier transform-infrared spectroscopy (FT-IR), scan-ning electron microscopy (SEM), energy dispersive X-ray (EDX), electron spin resonance (ESR), and surface area measurements. Characterization results sug-gest that magnetic diatomite has a high surface area and porous structure. In addition, m-DE-APTES has higher adsorption capacity (97.2 mg/g) for en-dosulfan pesticide than unmodified diatomite particles (DE) (16.6 mg/g). The adsorption data fit the Langmuir model (R2=0.9905), and the adsorption process took place spontaneously with the values of ΔGo as -2.576. In conclusion, the surface-modified diatomite particles are promising alternative adsorbents for pesticide removal from aqueous solutions.

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Single-Component and Multi-Component Metal Abatement in Water Using a Hydrogel Based on Chitosan: Characterization, Isotherm, Kinetic, and Thermodynamic Results

Cited by 6 publications

References 55 publications

A Beginner’s Guide to the Characterization of Hydrogel Microarchitecture for Cellular Applications

A Beginner’s Guide to the Characterization of Hydrogel Microarchitecture for Cellular Applications

Endosulfan Elimination Using Amine-Modified Magnetic Diatomite as an Adsorbent

Amine Modified Magnetic Diatomite Particles as an Effcicent Adsorbent for Pecticide Removal

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