Energy‐Efficient Preparation Method of Water‐Swellable Starch Phosphate Carbamate Particles

Harada, Nobuyuki; Mitsukami, Yoshiro; Uyama, Hiroshi

doi:10.1002/star.202000119

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Several additional bands in the IR spectrum of the phosphorylated cotton cellulose were obtained. The absorption band at 1720 cm -1 indicates the presence of the C=O groups that were probably formed after the destruction of the pyranose ring and the partial oxidation of cellulose at high temperatures and formation of carbamates [20][21][22][23]. Presumably, it means partial oxidation of the sample.…”

Section: № C(h3po4) Mol Lmentioning

confidence: 99%

Physicochemical and Sorptive Properties of a Phosphorylated Mercerized Cotton Fabric

et al. 2021

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A process of phosphorylation for a mercerized cotton kersey fabric was investigated. After wet oxidation, the phosphorus content in each sample was determined by spectrophotometric analysis. The range was 0.179 to 0.950 mmol g–1. A significant decrease in the tensile strength of samples resulted from an increase of phosphoric acid concentration in the phosphorylating solution. The mercerization has a positive impact on the process of phosphorylation, as the phosphorus content was found to be three times higher in the samples that underwent mercerization. The sorption properties of phosphorylated cotton fabric were studied using the Cu2+ sorption process as a reference. The value of the static exchange capacity for the phosphorylated fabric was determined to reach its maximum when the concentration of the H3PO4 in the phosphorylating solution was 1.40 M, and was found to be 1.48 ± 0.11 mmol g–1 with the phosphorus content equal to 0.898 ± 0.090 mmol g–1. The sorption of Cu2+ by a single phosphorus-containing group occurred for samples with phosphorus content not exceeding 0.80 mmol g–1. The preliminary studies of micro-quantities of 241Am, 233U, and 239Pu radionuclide sorption from aqueous solutions with phosphorylated textile demonstrated the high efficiency.

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Section: № C(h3po4) Mol Lmentioning

confidence: 99%

Physicochemical and Sorptive Properties of a Phosphorylated Mercerized Cotton Fabric

et al. 2021

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Preparation of phosphorylated kapok fiber using ammonium dihydrogen phosphate and its thermal degradation and flame retardancy

Zhang,

Tang

2023

Cellulose

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Microwave-Assisted Carbamation and One-Pot Phosphorylation-Carbamation of Starch Using Molten Urea as a Reactive Solvent

Ravishankar,

Muthusamy,

Durai

et al. 2024

ACS Sustainable Resour. Manage.

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This study presents a rapid and convenient approach for the carbamation of starch through the microwave irradiation of its mixture with an excess of urea. In this process, urea served not only as a dielectrically lossy material conducive to microwave heating but also as a solvent in its molten state and a source of isocyanic acid. The formation of starch carbamate was confirmed by the appearance of ν(C�O) and ν(C−N) vibrations in the FTIR spectrum, along with the detection of a carbamate carbonyl signal in the 13 C NMR spectrum. The resultant derivative, with a degree of substitution of 0.71, exhibited exceptional coldwater solubility, resistance to retrogradation, and cold solubility in organic solvents such as DMSO, N,N-DMF, and DMAc. Additionally, this microwave-assisted technique could be modified to include other agents with urea. For example, introducing sodium dihydrogen orthophosphate to the starch-urea mixture led to simultaneous phosphorylation. Control experiments indicated that this concurrent phosphorylation-carbamation introduced phosphodiester linkages between the starch molecules in addition to carbamation, resulting in an absorbent material. This absorbent was capable of absorbing about 2200% of distilled water, even in its crude, unpurified form. This easy-to-synthesize absorbent, particularly in its crude form, holds immense promise in agriculture for providing combined nitrogen and phosphorus supplementation along with water retention.

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Energy‐Efficient Preparation Method of Water‐Swellable Starch Phosphate Carbamate Particles

Cited by 3 publications

References 23 publications

Physicochemical and Sorptive Properties of a Phosphorylated Mercerized Cotton Fabric

Physicochemical and Sorptive Properties of a Phosphorylated Mercerized Cotton Fabric

Preparation of phosphorylated kapok fiber using ammonium dihydrogen phosphate and its thermal degradation and flame retardancy

Microwave-Assisted Carbamation and One-Pot Phosphorylation-Carbamation of Starch Using Molten Urea as a Reactive Solvent

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