Natural fibers for hydrogels production and their applications in agriculture

Abstract

This paper presents a review on hydrogels applied to agriculture emphasizing on the use of natural fibers. The objectives were to examine, trends in research addressed to identify natural fibers used in hydrogels development and methods for modifying natural fibers, understand factors which determine the water retention capacity of a hydrogel. Consequently, this paper shows some methodologies used to evaluate the hydrogels efficiency and to collect in tables, relevant information in relation to methods of natural fibers modification and hydrogel synthesis. It was found that previous research focused on hydrogels development processed with biodegradable polymers such as starch, chitosan and modified natural fibers, cross-linked with potassium acrylate and acrylamide, respectively. In addition, current researches aimed to obtaining hydrogels with improved properties, which have allowed a resistance to climatic variations and soil physicochemical changes, such as pH, presence of salts, temperature and composition. In fact, natural fibers such as sugarcane, agave fiber and kapok fiber, modified with maleic anhydride, are an alternative to obtain hydrogels due to an increasing of mechanical properties and chemically active sites. However, the use of natural nanofibers in hydrogels, has been a successful proposal to improve hydrogels mechanical and swelling properties, since they give to material an elasticity and rigidity properties. A hydrogel efficiency applied to soil, is measured throughout properties as swellability, mechanical strength, and soil water retention. It was concluded that hydrogels, are an alternative to the current needs for the agricultural sector.Key words: Hydrogels, methods of modifying fiber, nanofibers, superabsorbent, water retention capacity. ResumenEn el presente artículo se presenta una revisión de literatura sobre hidrogeles aplicados a la agricultura, haciéndose mayor énfasis en el uso de fibras vegetales. Los objetivos fueron examinar las tendencias en la investigación, identificar las fibras naturales utilizadas en el desarrollo de hidrogeles, mostrar los métodos de modificación de fibras naturales para la elaboración de hidrogeles, entender los factores que determinan la capacidad de retención de agua de un hidrogel, mostrar algunas metodologías empleadas para evaluar la eficiencia de un hidrogel y recopilar en tablas, información relevante en relación a métodos de modificación de fibras naturales y de síntesis de hidrogeles. Se encontró que las investigaciones se orientan al desarrollo de hidrogeles elaborados a bases de polímeros biodegradables como almidón, quitosano y fibras vegetales modificadas, entrecruzadas con acrilato de potasio y acrilamida. Además, las investigaciones apuntan a la obtención de hidrogeles con propiedades mejoradas, que permitan resistir las variaciones climáticas y los cambios fisicoquímicos del suelo como el pH, la presencia de sales, temperatura y composición. Fibras naturales como caña de azúcar, fibra de agave y fibra de kapoc, modificadas con ...

Natural Fibers: Applications

“…Lignin which coats or covers the cellulose part shows lower tendency to react with other molecules and poor adhesion with polymer matrix. Therefore the natural fibers most of the time have to undergo through treatment or modifications to improve the reactivity, interaction, and better adhesion with polymer matrix or other molecules [28].…”

“…Hydrogel synthesis methods are mass polymerization, solution, and reverse suspension (use of initiator and a crosslinking agent). Generally hydrogel synthesis based upon the plant fibers uses solution polymerization method [28]. Figure 2 shows general hydrogel preparation process.…”

Valorization of Pineapple Residues from the Colombian Agroindustry to Produce Cellulose Nanofibers

“…Cellulose nanofibers are generally obtained from agricultural sources such as wheat straw, cotton, coconut husk fibers, sisal fiber, bamboo waste, and sugarcane bagasse, among others [5,12]. Agro-industrial waste could also be a good source of cellulose nanofibers [13][14][15]. In this regard, circular economy [16,17] and revalorization strategies [18,19] are capable of revalorizing abundant and biodegradable agro-industrial waste that could play an important role in a globally sustainable future economy.…”

TEMPO-Oxidized Cellulose Nanofibers: A Potential Bio-Based Superabsorbent for Diaper Production

“…They also estimated that a baby uses about 4000 diapers on average (about 120 kg) and most of them go to landfill, which represents about 8 million diapers per day in the UK [8]. Hence, although there are already natural-based SAPs from chitosan, starch, carrageenan and starch, there is no doubt that finding a greener solution is an urgent matter that needs to be tackled quickly [9,10]. The state of Vanuatu for example, a small archipelago in the Pacific Ocean with a population of about 0.3 million people distributed across 65 islands, has already decided to ban disposable diapers [11].…”