Radiation synthesis and characterization of super absorbent hydrogels for controlled release of some agrochemicals

Abstract

Superabsorbent copolymers of carboxymethyl cellulose/polyacrylamide (CMC/PAM) and carboxymethyl celullose/polyacrylamide/silica (CMC/PAM/Si) were synthesized using a c-irradiation technique. The effects of irradiation dose, content of CMC, AM, and Si on swelling percentage of the produced hydrogels were evaluated. It was found that the maximum swelling percent increased dramatically up to 12,000 % at pH 12 with increasing content of silica up to 5 % in the CMC/PAM/Si composite hydrogel. The prepared copolymers were characterized by FTIR, and SEM techniques. In order to evaluate their controlled release potentials, different hydrogels were loaded with potassium nitrate (KNO 3 ), and the release of the KNO 3 was studied and evaluated at various pH values.

A Novel Antifungal Plasma-Activated Hydrogel

“…At present, there is still no recognized and suitable method for measuring the active ingredients in hydrogels. In addition, the equilibrium swelling method is widely used to induce the hydrogels to absorb artificially added active substances, and it is assumed that the active ingredients do not react with the hydrogels. , In addition, according to the results of FTIR (Figure a), the surface groups of PAAm were not significantly affected by PAW. It could be concluded that the active substances in PAW hardly reacted with the PAAm hydrogel network or affected the polymerization of the PAAm hydrogel.…”

A green route to prepare fluorescent and absorbent nano-hybrid hydrogel for water detection

“…The decrease of the swelling capacity of the hydrogels is mainly because of the screening effect and a loss of the osmotic pressure difference between the hydrogels and the fluids 40 . In 0.9% NaCl salt solutions, the anion–anion rejection of the carboxylate groups of CNC is also obstructed by the Na + ions that shield the carboxylate groups, so the swelling capacity is decreased.…”

Preparation of carboxymethyl cellulose‐g‐poly (acrylamide)/montmorillonite superabsorbent composite as a slow‐release urea fertilizer

“…Also, SACs regulate the release of the fertilizer and avoid its hydrolysis. 4,5 In addition, SACs can be used for the reinstatement of degraded lands by raising the obtainable water in the soil. 6 Biopolymer-based SACs are 3D cross-linked hydrophilic polymers with interconnected open channels.…”

“…This may be due to the improvement of the soil swelling capacity and diminishing the consumption of irrigation water. Also, SACs regulate the release of the fertilizer and avoid its hydrolysis . In addition, SACs can be used for the reinstatement of degraded lands by raising the obtainable water in the soil .…”