Comparative Study of Cellulose Hydrogel Films Prepared from Various Biomass Wastes

Cho, Cho; Aye, Thinzar; Khaing, Aung Myint; Kobayashi, Takaomi

doi:10.5772/intechopen.99215

“…1 B gives the hint that the CDA utilized in this study is substantially crystalline. Since lignin is known to be largely amorphous and yields diffuse peaks 42 , 43 , it is reasonable to infer from Fig. 1 B that the CDA matrix used in our study has significantly more amount of cellulose than lignin.…”

Section: Resultsmentioning

confidence: 80%

“…Cellulose, from which lignin and hemicellulose have been removed, is known to exhibit enhanced crystalline character 43 . The absence of lignin and probably other organic materials in the spectrum in Fig.…”

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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“…The absorptions for CDA recorded in Table 1 are in general agreement with the FTIR band assignments of cow dung by Kiyasudeen et al in this study is substantially crystalline. Since lignin is known to be largely amorphous and yields diffuse peaks, 42,43 it is reasonable to infer from Fig. 1(B) that the cow dung matrix used in our study has significantly more amount of cellulose than lignin.…”

Section: Fourier Transform Infrared (Ftir) Spectra Of Cdamentioning

confidence: 84%

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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“…Table 1 does not cover all the results obtained in recent years, but it is provided for the purpose of understanding the potential for swelling, as it presents different solvents and different starting cellulosic materials (cellulose, lignocellulose, wastes). It should be noted that Table 1 lists not only hydrogels but also hydrogel films [ 74 , 86 ], for which the swelling properties are lower.…”

Section: Physical Propertiesmentioning

confidence: 99%

“…The hydrogels from hardwood lignocellulose had the highest swelling ability, while the sugarcane bagasse hydrogels had the lowest [ 64 , 84 ]. However, the swelling abilities of the hydrogels obtained from agricultural wastes in dimethyl sulfoxide (DMSO)/LiCl, namely thanaka tree heartwood, sugarcane bagasse, and rice straw celluloses, were relatively similar (1.66–1.89 g/g) [ 86 ]. The lower values can be explained by the shape of the hydrogels and hydrogel films prepared in the study, in which swelling abilities were much lower for hydrogels resulting from the (DMSO)/LiCl dissolving system than for those resulting from the DMAc/LiCl.…”

Section: Physical Propertiesmentioning

confidence: 99%

Cellulose-Based Metallogels—Part 2: Physico-Chemical Properties and Biological Stability

Mikhailidi,

Volf,

Belosinschi

et al. 2023

Gels

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Metallogels represent a class of composite materials in which a metal can be a part of the gel network as a coordinated ion, act as a cross-linker, or be incorporated as metal nanoparticles in the gel matrix. Cellulose is a natural polymer that has a set of beneficial ecological, economic, and other properties that make it sustainable: wide availability, renewability of raw materials, low-cost, biocompatibility, and biodegradability. That is why metallogels based on cellulose hydrogels and additionally enriched with new properties delivered by metals offer exciting opportunities for advanced biomaterials. Cellulosic metallogels can be either transparent or opaque, which is determined by the nature of the raw materials for the hydrogel and the metal content in the metallogel. They also exhibit a variety of colors depending on the type of metal or its compounds. Due to the introduction of metals, the mechanical strength, thermal stability, and swelling ability of cellulosic materials are improved; however, in certain conditions, metal nanoparticles can deteriorate these characteristics. The embedding of metal into the hydrogel generally does not alter the supramolecular structure of the cellulose matrix, but the crystallinity index changes after decoration with metal particles. Metallogels containing silver (0), gold (0), and Zn(II) reveal antimicrobial and antiviral properties; in some cases, promotion of cell activity and proliferation are reported. The pore system of cellulose-based metallogels allows for a prolonged biocidal effect. Thus, the incorporation of metals into cellulose-based gels introduces unique properties and functionalities of this material.

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Comparative Study of Cellulose Hydrogel Films Prepared from Various Biomass Wastes

Cited by 4 publications

References 35 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

Cellulose-Based Metallogels—Part 2: Physico-Chemical Properties and Biological Stability

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