Hydrogels based on oxidized starches from different botanical sources for release of fertilizers

León, Orietta; Soto, Diana; Antúnez, Andrés Eduardo Aguirre; Fernández, Rosangel; González, J.; Pina, Carlos M.; Muñoz‐Bonilla, Alexandra

doi:10.1016/j.ijbiomac.2019.06.131

Cited by 37 publications

(6 citation statements)

References 72 publications

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“…The second weight loss is likely caused due to the loss of CO 2 from the polysaccharide, [46] followed by the third stage, which is also associated with starch decomposition. [29,47] This thermal decomposition step was also observed in the TGA curves of neat starches in the range of 290-355°C, with a maximum at approximately 300°C (Figure 4a, Table 2). The fourth stage corresponds to the degradation of grafted AA and with decomposition of amide groups from grafted AAm chains in starch-g-(AA-AAm).…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 53%

“…The high SR are likely due to the interaction of urea with polar hydrogel groups to form hydrogen bonds. [29] From these results, it can be concluded that the tested hydrogels can be saturated in neutral compounds, as shown in the case of urea solutions, and, thus, can be used as sources for release of fertilizers.…”

Section: Swelling Of Hydrogels In Fertilizer Solutionsmentioning

confidence: 74%

“…However, this effect also depends on the cation ionic radius, as penetration of water into the hydrogel decreases with increasing ionic radius. [29] The highest SR values were observed for hydrogels swollen in urea solutions. The SR of the non-crosslinked hydrogel prepared with waxy corn starch was 327 g urea solution per g dry matter, and the same cross-linked hydrogel absorbed only 135 g urea solution per g dry matter.…”

Section: Swelling Of Hydrogels In Fertilizer Solutionsmentioning

confidence: 94%

“…Hydrogels with a slow release of nutrients prevent over-fertilization of the soil, thus avoiding salinization and subsequent contamination of groundwater. [16,28,29] In this work, hydrogels were synthesised by grafting AA and AAm on starches, obtained from different natural sources, using PSA as initiator and MBA as cross-linking agent. The aim of this study was to find conditions for preparation of hydrogels with properties suitable for agricultural applications; in particular, high swelling and low solubility.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogels Based on Starch from Various Natural Sources: Synthesis and Characterization

et al. 2021

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Hydrogels based on a graft copolymer of acrylic acid (AA) and acrylamide (AAm) on a backbone of starch, obtained from different natural sources, have been prepared and characterized for potential agricultural use, as soil moisture regulators and nutrient sources for plant nutrition. Five types of starch are used: corn, waxy corn, wheat, potato, and rice starch. Hydrogels are prepared by a solution polymerization method, in the presence of ammonium persulphate (PSA) as initiator and N,N'-methylene-bis-acrylamide (MBA) as a cross-linking agent. Thermal and physico-chemical properties, such as thermogravimetry analysis and differential scanning calorimetry data and swelling properties of hydrogels, are observed. The influences of the cross-linking agent on the swelling ratio (SR) and solubility of prepared hydrogels are studied and optimized. The highest SR observed in water corresponded to non-cross-linked hydrogels prepared with waxy corn starch (780 g water per g dry matter), and the SR of these hydrogels in ammonium sulfate and calcium nitrate solutions are 9.6 and 1.2 g per g dry matter, respectively. Higher thermal stability is observed with cross-linked starch-g-(AA-AAm) hydrogels. The non-cross-linked hydrogels have a higher SR, but also have significant solubility in water.

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Section: Thermogravimetric Analysis (Tga)supporting

confidence: 53%

Section: Swelling Of Hydrogels In Fertilizer Solutionsmentioning

confidence: 74%

Section: Swelling Of Hydrogels In Fertilizer Solutionsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Hydrogels Based on Starch from Various Natural Sources: Synthesis and Characterization

et al. 2021

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“…Starch is a polysaccharide substance found in enormous quantities in nature, that is inexpensive, biocompatible, renewable, and degradable [25,26]. Amylose and amylopectin are two forms of semi-crystalline granules found in starch [27].…”

Section: Introductionmentioning

confidence: 99%

Development of Absorbent Using Amylose-Graphite Composite Electrode for Removal of Heavy Metals

Guizani

Ito

et al. 2021

Membranes

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Amylose of Phragmites Australis captures heavy metals in a box consisting of sugar chains. However, its absorption rate is low in the period of the month scale. Therefore, the electrochemical driving force was used to promote the absorption rate in this research. Amylose was doped with TiO2 porous graphite electrode. The composted absorbent was characterized using XRD(X-ray diffraction), SEM (Scanning Electrode Microscopy), Raman spectroscopy, and electrochemical methods. The affinity and maximum absorption amount were calculated using the isotherm method. In this study, Pb2+, Cu2+, Cd2+, and Cr6+ were chosen to demonstrate because these heavy metals are significant pollutants in Japan’s surface water. It was found that the maximum absorption was Cu2+ (56.82-mg/L) > Pb2+ (55.89-mg/L) > Cr6+ (53.97-mg/L) > Cd2+ (52.83.68-mg/L) at −0.5 V vs. Ag/AgCl. This is approximately the same order as the hydration radius of heavy metals. In other words, the absorption amounts were determined by the size of heavy metal ions. Subsequently, the mixed heavy metal standard solution was tested; the maximum absorption amount was 21.46 ± 10.03 mg/L. It was inferred that the electrochemical driving force could be shown as the ion size effect in the mixed solution. Despite there being no support for this hypothesis at this time, this study succeeded in showing that the electrochemical driving force can improve the ability of the absorbent.

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Succinylated Starches for Dye Removal

2020

Self Cite

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Succinylated bitter cassava starches were evaluated for the removal of cationic, methylene blue (MB) and anionic, methyl orange (MO) dyes present in water. The native starch (NS) extracted from bitter cassava by the dry method, was modified using succinic anhydride (SA) as esterifying agent and sodium hydroxide (NaOH), sodium carbonate (Na 2 CO 3 ), sodium sulfate (Na 2 SO 4 ) and sodium chloride (NaCl) as non-toxic and environmentally friendly catalysts. The effect of the type and concentration of catalyst on the modification was evaluated. Starch replacement with SA was confirmed by Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WAXS), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The degree of substitution in the resulting succinylated starches (GS) was determined by volumetric analysis, presenting high values (0.5-0.9). These materials arisen superabsorbent gels, sensitive to changes in pH and ionic strength, and mostly with anti-polyelectrolytic behavior. MB dye had a higher affinity for succinylated starches than the MO dye. The removal capacity of MB was also influenced by the pH and the ionic strength of the solution. The kinetics and adsorption isotherms were satisfactorily adjusted to the pseudo-second order and Freundlich models, respectively. The esters functionalities of the starch proved to be reusable adsorbents, completing successfully five cycles of adsorption-desorption.

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Hydrogels based on oxidized starches from different botanical sources for release of fertilizers

Cited by 37 publications

References 72 publications

Hydrogels Based on Starch from Various Natural Sources: Synthesis and Characterization

Hydrogels Based on Starch from Various Natural Sources: Synthesis and Characterization

Development of Absorbent Using Amylose-Graphite Composite Electrode for Removal of Heavy Metals

Succinylated Starches for Dye Removal

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