Slow-released NPK fertilizer encapsulated by NaAlg-g-poly(AA-co-AAm)/MMT superabsorbent nanocomposite

Rashidzadeh, Azam; Olad, Ali

doi:10.1016/j.carbpol.2014.08.010

Cited by 207 publications

(191 citation statements)

References 33 publications

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“…On the basis of the above background and our previous studies on slow release property of hydrogel nanocomposites [18,19] and slow release fertilizers, we attempted to prepare a coated NPK granular fertilizer with hydrogel/clinoptilolite (Hyd/CL) nanocomposite in this work. As it was stated in our previous paper [18], clinoptilolite as one of natural zeolites because of its unique physical and chemical properties has widely been used as fertilizer carrier in agricultural applications.…”

Section: Introductionmentioning

confidence: 98%

“…Recently, the preparation of hydrogel/clay composite has attracted great attention because of their relative low production cost and good water-retention and their considerable slow release properties [15][16][17]. Nanocomposite hydrogel of alginate-g-poly acrylic acid-co-acrylamide (NaAlg-g-Poly (AA-co-AAm) with clinoptilolite [18] and montmorillonite clays [19] have been used for loading and release of NPK fertilizer in our previous works. Rashidzadeh et al in these work suggested that the hydrogel nanocomposite designed in their work not only had the ability to deliver and release fertilizer, but also had good water adsorption capacity, which can reduce loss of fertilizer and improve the utilization of water in agricultural applications.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

2015

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Preparation of a new core-shell slow-release fertilizer formulation was conducted through the coating of commercial NPK fertilizer with hydrogel/clinoptilolite (Hyd/CL) nanocomposite. The Hyd/CL nanocomposite was prepared from free radical polymerization of sodium alginate, acrylic acid, acrylamide, and clinoptilolite zeolite. The uniform coating on the surface of the fertilizer granules was verified by scanning electron microscopy. The swelling kinetics as well as the water-retention property and water absorption rate of the prepared samples was studied. Furthermore, the release of fertilizer from Hyd/CL nanocomposite-coated fertilizer granules into soil showed that the Hyd/CL nanocomposite layer around the fertilizer granules caused the system to liberate the nutrient in a more controlled manner (lower than 57 % of loaded fertilizer on the 30 days) than that with the uncoated fertilizer. The overall results eventually suggested that the hydrogel nanocomposite designed in this work can be used as a coating on granular fertilizer compounds for application in agriculture due to its water-retention and slow-release properties.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

2015

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“…In brown algae, alginates are the most abundant polysaccharides reaching up to 40% of the dry weight [6]. Amongst the recent applications of alginates, we can highlight their use as a matrix to encapsulate and release fertilizer and also for the synthesis of superabsorbent [7][8][9]. Alginates are typically described by their M/G ratio and average molecular weight, since these parameters are closely related to the functionality of the alginates as the encapsulation material [10].…”

Section: Introductionmentioning

confidence: 99%

Characterization and properties of sodium alginate from brown algae used as an ecofriendly superabsorbent

Helmiyati

Aprilliza

2017

IOP Conf. Ser.: Mater. Sci. Eng.

114

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Abstract. Sodium alginate obtained from the extraction of brown algae is used as the backbone for the synthesis of superabsorbent nanocomposite copolymerization. The first stage of extraction is the demineralization process using 0.1 M HCl solution and then 2% Na2CO3 solution for 2 hours at 60°C. The rendement of sodium alginate obtained was 44.32% with molecular weight of 40680 g/mol with measurement of the intrinsic viscosity. FTIR spectra of sodium alginate showed mannuronic acid functional group at wavenumber 884 cm -1 and the uronic acid at wavenumber 939 cm -1 , OH functional group at wavenumber 3200-3400 cm -1 , and CH2 stretching at wavenumber 2928 cm -1 . The diffraction pattern of isolated sodium alginate has specific 2θ at 13.068 and 21.096, amorphous intensity found specific 2θ at 18.058, and the obtained crystallinity degree of the sodium alginate is equal to 29.292% from the XRD analysis. The morphological analysis by SEM shows fibrils of isolated sodium alginate. The success isolation of sodium alginate from brown algae is supported by DSC which shows the decomposition temperature of pure sodium alginate and isolated alginate have close values, namely 251.12°C for pure sodium alginate and 229.90°C for isolated sodium alginate.

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“…Slow/controlled release fertilizers have been based on urea-aldehyde resins, polyvinylidene chloride [14][15][16], hydrogel nanocomposites [17,18], kaolin-chitosan systems [19,20], polysulfones [21,22], polyamides [23], polyesters [24], polyvinyl alcohol [25], polyurethanes [26,27], and other hybrid systems [28]. Current trends focus on biopolymers [29].…”

Section: Introductionmentioning

confidence: 99%

Synthesis Optimization and Characterization of Microencapsulated N-P-K Slow-Release Fertilizers

et al. 2015

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Slow-release microencapsulated N, P, and K fertilizer synthesis was optimized and the products exhaustively characterized. Four NPK formulations with nutrient mass ratios of 1:0:0, 1:1:0, 1:1:1, and 2:1:1 were characterized following European Council Regulation 2003/2003 for fertilizers as well as ICP-AES, 1 H-NMR, FT-IR, HPLC, elemental analysis, XPS, SEM, dynamic light scattering, thermogravimetry, differential thermogravimetry, activity index, and leaching rate. These fertilizers have good slow-release properties and decrease waste and crop contaminants, improving environmental protection. Compared to classic granulated fertilizers, plant nutrient availability was improved allowing reduced application. Nutrient leaching parameters describing four different kinetic models were evaluated.

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Slow-released NPK fertilizer encapsulated by NaAlg-g-poly(AA-co-AAm)/MMT superabsorbent nanocomposite

Cited by 207 publications

References 33 publications

Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

Hydrogel/clinoptilolite nanocomposite-coated fertilizer: swelling, water-retention and slow-release fertilizer properties

Characterization and properties of sodium alginate from brown algae used as an ecofriendly superabsorbent

Synthesis Optimization and Characterization of Microencapsulated N-P-K Slow-Release Fertilizers

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