A novel semi-IPN hydrogel: Preparation, swelling properties and adsorption studies of Co (II)

Ozone (O 3) has many industrial applications such as in sterilization. One of the long-term O 3 preservation methods is molecular storage in clathrate hydrate. In this study, an experimental system was developed for continuously forming O 3 + O 2 + CO 2 hydrates. The parameters that affect the continuous operation of the system and that lead to increases in the concentration of O 3 in the hydrates were also experimentally evaluated, implementing the method of quality engineering. After optimizing these operating parameters, the O 3 storage capacity in the hydrates was measured to be 0.26 wt % at 2 h of total operation time. By X-ray diffraction, it was found that the produced sample contained hydrates, and longterm preservation for 6 months was possible at the temperature of general freezing warehouses.

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“…The test conditions based on the L 9 orthogonal array of the quality engineering method [27][28][29][30][31][32] are shown in Tab. 1.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Hatsugai

Nakayama

Tomura³

et al. 2020

Chem Eng & Technol

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“…Moreover, the behavior of this hybrid hydrogel based on PAV and cellulose for retaining of Co 2+ ions from aqueous media ( q e,max = 181.82 mg/g), is comparable with that of other types of hydrogels used as biosorbent in removal processes of certain metal ions from aqueous solutions, such as: (i) PVA-P (AA-co-AM) semi-IPN hydrogel—Co 2+ ; q = 1563.13 mg/g [ 35 ]); (ii) chitosan-CMC—Cu 2+ ; q = 169.49 mg/g [ 45 ]; (iii) interpenetrating network hydrogel—Ni 2+ ; q = 102.34 mg/g [ 46 ]; (iv) starch—g-poly(acrylicacid) (PAA)/sodium humate (St-g-PAA/SH) hydrogels—Cu 2+ ; q = 177.9 mg/g [ 47 ]; (v) polycarboxilated starch-based hydrogel—Cu 2+ ; q = 128.26 mg/g [ 48 ]; (vi) N-vinyl imidazole-based hydrogel—Pb 2+ ; q = 30.38 mg/g [ 49 ]; (vii) hydrogel based on chitosan-glucose andacrylic acid—Cu 2+ ; q = 286 mg/g and Co 2+ ; q = 273.9 mg/g [ 50 ]; (viii) tailored chitosan/orange peel hydrogel composite—Cu 2+ ; q = 116.637 mg/g and hydrogel—Cr 6+ ; q = 107.498 mg/g [ 51 ].…”

Section: Resultsmentioning

confidence: 75%

“…For the characterization of the prepared biomaterial, in order to highlight the internal structure and the functional groups responsible for the adsorbent properties, the study of the degree of swelling was performed by using physico-chemical instrumental analysis methods, i.e., Scanning Electron Microscopy (SEM) and Fourier–Transform Infrared Spectroscopy (FTIR), and are described in other authors’ reports [ 32 , 33 , 34 ]. It must be mentioned that at a very low pH (1.5–2.0), the prepared hybrid hydrogel stability was good, and the swelling degree had the lowest value related to the maximal swelling degree shown at a pH of around 6.5–7.5 [ 35 ].…”

Section: Methodsmentioning

confidence: 99%

Hydrogel Based on Tricarboxi-Cellulose and Poly(Vinyl Alcohol) Used as Biosorbent for Cobalt Ions Retention

2021

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A biomaterial based on poly(vinyl alcohol) reticulated with tricarboxi-cellulose obtained by TEMPO oxidation (OxC25) was used as a new biosorbent for Co(II) ions retention from aqueous solutions. The biosorption process of Co(II) ions was studied while mainly considering the operational factors that can influence it (i.e., biosorbent concentration, pH of the aqueous media, temperature and contact time of the phases). The maximum adsorption capacity was 181.82 mg/g, with the biosorption well fitted by the Langmuir model. The kinetic modeling of the biosorption process was based on certain models: Lagergreen (pseudo first order model), Ho (pseudo second order model), Elovich (heterogeneous biosorbent model), Webber–Morris (intraparticle diffusion model) and McKay (film diffusion model). The corresponding kinetic model suggests that this biosorption process followed a pseudo-second order kinetic model and was developed in two controlled steps beginning with film diffusion and followed by intraparticles diffusion.

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“…Meanwhile, the peak of the C-O-C of CMC and the isopropyl characteristic peak of PNIPAM basically disappeared in the curve of the CMC/P (NIPAM-co-AA) hydrogel due to the formation of the cross-linking network between the chain of CMC and the polymerase chain of P (NIPAM-co-AA). Therefore, the spectra have illustrated the successful linking of CMC onto the P (NIPAM-co-AA) polymer [34]. The thermogravimetric (TGA) curves of PNIPAM, P (NIPAM-co-AA), P (NIPAM-co-CMC), and CMC/P (NIPAM-co-AA) are presented in Figure 4.…”

Section: Characterization Of Ftir and Tga For Gelmentioning

confidence: 92%

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

et al. 2020

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In this work, the thermo-sensitive materials N-isopropylacrylamide (NIPAM) and acrylic acid (AA) were crosslinked with carboxymethyl cellulose (CMC) (CMC/P (NIPAM-co-AA)) via a free radical polymerization method for the removal of U(VI) from aqueous solution. The L16 (45) orthogonal experiments were designed for the optimization of the synthesis condition. The chemical structures of the crosslinking hydrogel were confirmed by FTIR spectroscopy. The microstructural analyses were conducted though scanning electron microscopy (SEM) to show the pore structure of the hydrogel. The adsorption performance of the CMC/P (NIPAM-co-AA) hydrogel for the uptake of U(VI) from simulated wastewater was also investigated. The adsorption reached equilibrium within 1 h. Under the reaction of pH = 6 and a temperature of 298 K, an initial concentration of U(VI) of 5 mg·L−1, and 10 mg of the CMC/P(NIPAM-co-AA) hydrogel, the maximum adsorption capacity was 14.69 mg g−1. The kinetics fitted perfectly with the pseudo-second-order model, and the isotherms for the composite hydrogel adsorption of U(VI) was in accordance with the Langmuir model. The chemical modification confirmed that the acylamino group played an important role in uranium adsorption. The desorption and reusability study revealed that the resolution rate was still available at approximately 77.74% after five alternate heating cycles at 20 and 50 °C of adsorption-desorption.

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A novel semi-IPN hydrogel: Preparation, swelling properties and adsorption studies of Co (II)

Cited by 65 publications

References 42 publications

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Hydrogel Based on Tricarboxi-Cellulose and Poly(Vinyl Alcohol) Used as Biosorbent for Cobalt Ions Retention

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

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A novel semi-IPN hydrogel: Preparation, swelling properties and adsorption studies of Co (II)

Cited by 65 publications

References 42 publications

Development and Continuous Operation of a Bench‐Scale System for the Production of O3 + O2 + CO2 Hydrates

Development and Continuous Operation of a Bench‐Scale System for the Production of O3 + O2 + CO2 Hydrates

Hydrogel Based on Tricarboxi-Cellulose and Poly(Vinyl Alcohol) Used as Biosorbent for Cobalt Ions Retention

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

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Product

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Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates