Study on the synergistic effect of clinoptilolite on the swelling kinetic and slow release behavior of maize bran-based superabsorbent nanocomposite

In this study, a slow-release urea fertilizer hydrogel was synthesized from hydroxyl propyl methyl cellulose, polyvinyl alcohol and glycerol blends with paper (blended paper) as second layer. The fertilizer hydrogel was characterized by SEM, XRD and FTIR. Its retention in sandy soil, swelling behavior in distilled and tap water as well as slow-release behavior to urea were investigated. The results indicated that the fertilizer had good slow-release properties and ability to retain water in soil. However, the addition of blended paper as a second layer matrix was found to help improve the release properties of the fertilizer. The swelling kinetic of the hydrogel followed the Schott’s Second order model. The release kinetics of urea in water was best described by the Zero order model signifying that the release behavior was independent of fertilizer concentration

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Facile Fabrication of N-Slow Release Fertilizer Hydrogel Beads by Alginate-Based Composites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.889.91 ◽

2021 ◽

Vol 889 ◽

pp. 91-97

Author(s):

Suntree Sangjan ◽

Wadchara Thongsamer

Keyword(s):

Sodium Alginate ◽

Slow Release ◽

N Fertilizer ◽

Order Kinetic ◽

Release Behavior ◽

Hydrogel Beads ◽

Hydrogel Composite ◽

Slow Release Fertilizer ◽

Order Kinetic Model ◽

Fertilizer Release

A novel slow-release N-fertilizer hydrogel beads were developed using sodium alginate (SA) and alginate-talcum (ST) composite as N-absorbent. In this work, the hydrogel composite were fabricated by simple method and low cost. N-fertilizer hydrogel beads were prepared two types, for SA types, which were different sodium alginate (1(SA1), 3(SA3), 5(SA5), 7(SA7), and 10(SA10) wt%). And, for ST types, sodium alginate and talcum were vary ratios to 1:0.5(S1T0.5), 1:1(S1T1), and 1:2 (S1T2). The chemical structure of hydrogel composite beads were characterized via Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The release behavior were investigate by Zero-order kinetic model, First-order kinetic model, Higuchi model and Korsmeyer-Peppas model. We have found that the N-fertilizer release constants in Korsmeyer-Peppas model were decrease with increase SA content for 1-5 wt% in SA hydrogel beads. However, SA contents were more than 5 wt% which rapidly enhanced fertilizer release. In addition, to add talcum in ST hydrogel beads significantly reduced fertilizer release rate. The N-fertilizer hydrogel beads exhibits significantly slow release behavior. These results indicates that the development of slow-release fertilizer hydrogel beads can be improve the effectiveness of N-fertilizer.

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The Effect of pH in the Tap Water on Nutrient Release from Slow Release Fertilizers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.931-932.754 ◽

2014 ◽

Vol 931-932 ◽

pp. 754-757

Author(s):

Jittrera Buates ◽

Petchporn Chawakitchareon ◽

Rewadee Anuwattana

Keyword(s):

Slow Release ◽

Tap Water ◽

Nutrient Release ◽

Release Behavior ◽

Release Formulation ◽

Total N ◽

Nutrient Contents ◽

Scientific Methods ◽

N Release ◽

Slow Release Fertilizers

The objective of this research is to study the nutrient release behaviors on slow release fertilizer (Osmocote® N13:P13:K13, 3 month release formulation). The fertilizer was added into distilled water which adjusted pH of 6.5 and 7.5. The nutrient release behaviors were determined by collecting samples every 1 week and analyzed the nutrient contents in samples by scientific methods. As the result, for the total N release behavior, it may be considered that at lower pH condition tended to release more than that at higher one, for the P (shown by P2O5) and K (shown by K2O) release behaviors may be high at high pH condition.

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PCL Based CIP-Loaded Double-Layer Films Deposited by Low-Electron Beam Dispersion Method and its Antibacterial Properties

Eurasian Chemico-Technological Journal ◽

10.18321/ectj997 ◽

2020 ◽

Vol 22 (4) ◽

pp. 255

Author(s):

Qin Xu ◽

Beibei Li ◽

Zhengwei Xu ◽

Xiaohong Jiang ◽

M.A. Yarmolenko ◽

...

Keyword(s):

Electron Beam ◽

Double Layer ◽

Slow Release ◽

Antibacterial Properties ◽

Bottom Layer ◽

Release Time ◽

Release Behavior ◽

Dispersion Method ◽

Comprehensive Performance ◽

Sealing Layer

In this paper, low-electron beam dispersion (EBD) method is used to prepare a kind of double-layer films on different substrates. The bottom layer is a mechanically stirred mixture of the degradable polycaprolactone (PCL) and ciprofloxacin (CIP), and the top layer is polyurethane (PU) film. The molecular structure, chemical composition and morphology of the double-layer films were investigated by FTIR, XPS and SEM. The results showed that the surfaces of the double-layer films are uniform and the thicknesses can reach micron level. In addition, the two layers are well bonded. Then the films were sliced and immersed in PBS solution, and the time-dependent variable was used to analyze the kinetic slow-release behavior of CIP in the double-layer films by agar diffusion antibacterial experiments. It can be seen that sustained release time of CIP in the double-layer films can be up to 7 days, which is due to fact that the upper PU film working as a sealing layer helps to realize the drug slow-release. Based on the above research, the comprehensive performance of the films with the composition of PCL:CIP/PU=1:1/1 is the best.

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Release of Polyphenols from Liposomes Loaded with Echinacea purpurea

Revista de Chimie ◽

10.37358/rc.18.9.6525 ◽

2018 ◽

Vol 69 (9) ◽

pp. 2315-2317

Author(s):

Ramona Daniela Pavaloiu ◽

Fawzia Sha At ◽

Corina Bubueanu ◽

Georgeta Neagu ◽

Adrian Albulescu ◽

...

Keyword(s):

Drug Delivery ◽

Delivery System ◽

Drug Delivery Systems ◽

Slow Release ◽

Entrapment Efficiency ◽

Echinacea Purpurea ◽

Polydispersity Index ◽

Burst Release ◽

Release Behavior ◽

Liposomal Formulations

The aim of this study was to develop a delivery system for polyphenols from an extract of Echinacea purpurea leaves, based on liposomes. Liposomes loaded with Echinacea purpurea were prepared and characterized in terms of entrapment efficiency, size, polydispersity index, stability and release behavior. Results showed good entrapment efficiency, small sizes, low polydispersity index and good stability over 90 days at 4oC. Also, the liposomal formulations presented reduced burst release and slow release of polyphenols compared with free extract. Therefore, liposomes offer a great potential in the development of drug delivery systems for polyphenols.

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Iron/NPK agrochemical formulation from superabsorbent nanocomposite based on maize bran and montmorillonite with functions of water uptake and slow-release fertilizer

New Journal of Chemistry ◽

10.1039/c8nj01947a ◽

2018 ◽

Vol 42 (16) ◽

pp. 13899-13914 ◽

Cited By ~ 4

Author(s):

Hamed Gharekhani ◽

Ali Olad ◽

Farshad Hosseinzadeh

Keyword(s):

Water Uptake ◽

Slow Release ◽

Growth And Yield ◽

Nutritional Disorder ◽

Slow Release Fertilizer ◽

Maize Bran ◽

Hydrogel Nanocomposite

Slow-release character of hydrogel nanocomposite makes it efficient in amending Fe nutritional disorder, fertilizer loss, and crops growth and yield.

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

Journal of Applied Polymer Science ◽

10.1002/app.43082 ◽

2015 ◽

Vol 133 (12) ◽

pp. n/a-n/a ◽

Cited By ~ 10

Author(s):

Peng Wen ◽

Zhansheng Wu ◽

Yanhui He ◽

Yajie Han ◽

Yanbin Tong

Keyword(s):

Slow Release ◽

Release Behavior ◽

Soil Environment ◽

Simulative Soil

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Preparation and Properties of the Slow-Release Fertilizer with Green Coat

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.4745 ◽

2012 ◽

Vol 518-523 ◽

pp. 4745-4748

Author(s):

Qing Wang ◽

Sha Chen ◽

Pei Guang Zhao ◽

Yu Cao ◽

Long Fei Zhu ◽

...

Keyword(s):

Water Retention ◽

Slow Release ◽

Nutrient Release ◽

Release Behavior ◽

Digestion Method ◽

Slow Release Fertilizer ◽

Environmental Friendly ◽

Influence Of Water ◽

Slow Release Fertilizers ◽

Kjeldahl Digestion

A kind of double-coated environmental friendly fertilizer was prepared by urea as a core, well-mixed keratin and oxidation starch as an inner coating, and superabsorbent polymer as the outer coating. The influence of water absorbency, water retention, and the slow-release behavior of the study fertilizer were investigated. 0.01M CaCl2 immersion extraction and Kjeldahl digestion method were used to measure the content of nitrogen. And the result showed that the nutrient release was 72wt% on the thirtieth day. This result corresponded with the standard of slow release fertilizers of the Committee of European Normalization (CEN) [1]. Keratin and oxidation starch were biodegradable polymer and nontoxic. Both the properties of the materials and the result of the slow-release behavior suggested a new kind of excellent, environmental friendly, slow-release fertilizer.

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