Characterization of p(AA‐co‐AM)/bent/urea and its swelling and slow release behavior in a simulative soil environment

Peng, Wen; Wu, Zhansheng; He, Yueqiu; Han, Yu; Tong, Yanbin

doi:10.1002/app.43082

Cited by 28 publications

(11 citation statements)

References 35 publications

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“…Bent is mainly composed of montmorillonite (MMT), whose structural unit consists of two tetrahedral layers (Si–O) separated by an octahedral layer (Al–O–OH) and is a good substrate for SAP with reactive −OH groups on the surface, high surface area, swelling capacity, and valuable cation exchange capacity. − Furthermore, bent is environmentally friendly and readily available in large quantities at a low cost. Our previous studies indicated that incorporation of bent could improve water-retention capacity, swelling ability, thermal stabilities, and slow release properties. , …”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis of a Semi-interpenetrating Polymer Network Slow-Release Nitrogen Fertilizer with Water Absorbency from Cotton Stalks

Peng

et al. 2016

ACS Sustainable Chem. Eng.

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104

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A semi-interpenetrating polymer network (semi-IPN) slow-release nitrogen fertilizer with water absorbency was synthesized via microwave irradiation. Urea was incorporated as the nitrogen source into a cotton stalk-g-poly(acrylic acid)/ bentonite (CS-g-PAA/bent) network and linear polyvinylpyrrolidone (PVP). A reaction mechanism for synthesis of CS-g-PAA/ bent/PVP/urea was proposed. Variables influencing water absorbency, such as microwave power, irradiation time, and contents of CS, PVP, and bent were evaluated and optimized. The sample prepared under optimized conditions had a water absorbency of 1018.4 g/g in distilled water and 71.3 g/g in 0.9 wt % NaCl solution. The structure and properties of samples were characterized through various analysis technologies. Swelling measurements and water-retention study indicated that the sample possessed excellent water absorbency in different environments and enhanced the water-retention capacity of soil by introduction of bent and formation of a semi-IPN structure. Investigation of leaching behavior indicated that the sample has the potential to carry the necessary N. The results indicated that about 60% of nutrients were released after 30 days based on anomalous transport, and the sample improved the seed germination rate and promoted cotton growth. Thus, microwave irradiation is a possible method to produce slow-release fertilizers that could be widely applicable in agriculture and horticulture.

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Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis of a Semi-interpenetrating Polymer Network Slow-Release Nitrogen Fertilizer with Water Absorbency from Cotton Stalks

Peng

et al. 2016

ACS Sustainable Chem. Eng.

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104

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“…has been used in our previous studies, and results have indicated that the incorporation of bent. can improve swelling ability, water-retention capacity (WR%), thermal stabilities, and slow-release properties. , However, the incorporation of SAPs into N-BC for water-retention enhancement has not yet been reported. In this work, SAPs have been introduced to combine with N-BC to obtain novel BSRFs with water-retention properties.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis of a Novel Biochar-Based Slow-Release Nitrogen Fertilizer with Enhanced Water-Retention Capacity

Peng

Han

et al. 2017

ACS Sustainable Chem. Eng.

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152

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Biochar-based slow-release nitrogen fertilizers (BSRFs) have been arousing a great deal of interest from researchers and academics, but many of these fertilizers do not possess water-retention capacity. In this work, a polymer matrix has been introduced into NH4 +-loaded biochar (N-BC), using microwave (MW) irradiation, for the purpose of acting as a superabsorbent polymer to improve soil water-retention capacity. The polymer matrix is composed of cotton stalks (CSs), acrylic acid (AA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), and bentonite (bent.). N-BC was prepared via the adsorption of NH4 + onto BC, and its adsorption behavior was investigated. The structure and properties of the resulting samples were characterized using various characterization methods. Results suggest that BSRFs could significantly improve the water-holding and water-retention capacity of soil. BSRFs effectively reduced the nitrogen-release rate (69.8% of nitrogen was released after 30 days), and possessed low nitrogen-leaching-loss amounts (10.3%), low nitrogen migrate-to-surface-loss amounts (7.4%), and high nitrogen-use efficiency (64.27%), as compared to NH4Cl and N-BC, consequently effectively promoting cotton plant growth. The soil burial degradation test of BSRFs indicated that BSRFs possessed good degradability. BSRFs may therefore have promising applications in modern, sustainable agriculture, while MW irradiation is an important strategy with which to produce BSRFs.

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“…FTIR spectrum; (a) cellulose, (b) GEL-A before immersion, (c) GEL-B before immersion, (d) GEL-A after immersion, (e) GEL-B after immersionThe absorption peaks at wave numbers 3449 and 3445 cm -1 indicate the presence of the -OH group and the stretching of C-H was observed at wave numbers 2899 and 2928 cm -1[33]. Other peaks observed are absorption bands at wave numbers 1659 and 1603, 1377 and 1325-1419, and areas around 1000-1250 cm -1 , indicating the presence of carboxylic anion (-COO -) and N-H, as well as C-O or C-N[2,31,34]. Absorption peaks at wave numbers 611-671 and 602 cm -1 are associated with N-CO-N flexural vibrations, showing urea involvement in GEL-A and GEL-B[34].…”

mentioning

confidence: 98%

“…Other peaks observed are absorption bands at wave numbers 1659 and 1603, 1377 and 1325-1419, and areas around 1000-1250 cm -1 , indicating the presence of carboxylic anion (-COO -) and N-H, as well as C-O or C-N[2,31,34]. Absorption peaks at wave numbers 611-671 and 602 cm -1 are associated with N-CO-N flexural vibrations, showing urea involvement in GEL-A and GEL-B[34].…”

mentioning

confidence: 99%

Synthesis and Characterization of Controlled-Release Urea Fertilizer from Superabsorbent Hydrogels

et al. 2020

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It is very important to develop controlled-release fertilizers to ensure efficiency and environmental protection. This study aims to make a superabsorbent hydrogel-based controlled-release urea fertilizer. Superabsorbent hydrogels were prepared from the cellulose of corn cobs cross-linking with epichlorohydrin, and then an amount of urea as a fertilizer was stored inside the hydrogels (GEL-A). The GEL-A functionalization with carboxy-methyl was also carried out in this study to improve the hydrophilicity of hydrogels (GEL-B). GEL-A and GEL-B were immersed in water at a certain pH and temperature range and the urea concentration released from the hydrogels was monitored by a spectrophotometer. The results showed that the urea released by GEL-A and GEL-B was not much different. Respectively, the urea efficiency of GEL-A and GEL-Bwas around 5.29% and 5.56% for 180 min. The urea released from both hydrogels was not significantly affected by changes in the temperature of the solution. Urea release was influenced by pH, and the rate of urea release of GEL-B was faster than GEL-A, so pH control was needed in the application of this slow-release fertilizer.

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Characterization of p(AA‐co‐AM)/bent/urea and its swelling and slow release behavior in a simulative soil environment

Cited by 28 publications

References 35 publications

Microwave-Assisted Synthesis of a Semi-interpenetrating Polymer Network Slow-Release Nitrogen Fertilizer with Water Absorbency from Cotton Stalks

Microwave-Assisted Synthesis of a Semi-interpenetrating Polymer Network Slow-Release Nitrogen Fertilizer with Water Absorbency from Cotton Stalks

Microwave-Assisted Synthesis of a Novel Biochar-Based Slow-Release Nitrogen Fertilizer with Enhanced Water-Retention Capacity

Synthesis and Characterization of Controlled-Release Urea Fertilizer from Superabsorbent Hydrogels

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