Gum ghatti and poly(acrylamide-co-acrylic acid) based biodegradable hydrogel-evaluation of the flocculation and adsorption properties

DOE-based synthesis of gellan gum-acrylic acid-based biodegradable hydrogels: screening of significant process variables and in situ field studies

“…The improved water-holding capacity of the hydrogels has been reported by a few researchers to boost the irrigation requirements of several plants. 58,59 For agricultural and horticultural purposes, the developed absorbent can also act as an effective soil moisture retention agent for the delayed release of water molecules.…”

NaAlg-g-AA Hydrogels: Candidates in Sustainable Agriculture Applications

“…They are non-toxic, have a high swelling capacity, and show a degradation rate of up to 15% per year [ 2 ]. Semi-synthetic hydrogels obtained by grafting AAm and/or AA onto a polysaccharide chain show a degree of biodegradation (using the composting method) of up to 91.77% after only 60 days [ 27 ]. To combine the specific properties of hydrogels obtained from synthetic materials (stability, good mechanical properties) with those of natural ones (low toxicity, high degradability), the production of semi-synthetic hydrogels by grafting, cross-linking, or simply blending has gained momentum in recent years, and almost all known methods of obtaining them have been tried [ 1 , 20 , 28 , 29 ].…”

“…The purpose of this study is to present the results obtained in cross-linking and grafting experiments by irradiation with a 6 MeV electron beam carried out to obtain semi-synthetic hydrogels based on sodium alginate (NaAlg) and acrylic acid (AA). Among all used techniques for hydrogel development, the technique with ionizing or non-ionizing radiation (gamma, electron beam, UV, and microwave) presents significant advantages (ease, quick preparation, and low production cost) compared to other chemical cross-linking methods [ 20 , 27 ]. The NaAlg, a linear anionic polysaccharide extracted from seaweed, was chosen as a natural base material for hydrogels due to its versatility of functionality, price, non-toxicity, and biodegradability potential [ 29 , 30 ].…”

Low-Temperature Synthesis of Magnetic Carbonaceous Materials Coated with Nanosilica for Rapid Adsorption of Methylene Blue

“…Among them, the most popularly discussed methods include degradation either photocatalytic or sonochemical, adsorption, membrane filtration, biosorption, Fenton-biological treatment, oxidation, and coagulation–flocculation. − The most advantageous method is found to be adsorption, which is an equilibrium separation technique. Its low cost, ease and flexibility of design, reduced sensitivity to toxic contaminants makes adsorption the best technique for dye removal as compared to other techniques. − Adsorption using economical adsorbents for efficient decolorization has been studied in recent times. − The high cost of the most commonly used adsorbent, that is, activated carbon, has led to the use of several cheap and nonconventional adsorbents like sawdust, sugar cane bagasse, rice husk, fruit shells, and different gum polysaccharide-based hydrogels. ,− However, their low mechanical strength does not allow them to be used on an industrial scale. In recent years, substantial progress has been made for using different nanomaterials especially metal oxide nanoparticles such as ZnO, TiO 2 , Fe 3 O 4 , and SiO 2 in different wastewater treatment applications. ,− Therefore, researchers are focusing on developing nanoadsorbents because of high porosity and increased surface area for adsorption .…”