Novel guar gum-g-poly acrylic acid (GG-g-PAA) superabsorbent nanocomposites were prepared in aqueous solution using guar gum (GG), partially neutralized acrylic acid (AA), hydrogen peroxide (HP) as an initiator and N, N-methylene bisacrylamide (MBA) as crosslinkerby free radical graft copolymerization reaction. FTIR spectra confirmed that AA had been grafted onto GG chains. X-ray diffraction (XRD) to study its crystalline nature of the composite. Scanning Electron Microscopy (SEM) results shows that prepared composite have uneven and coarse surface. The present study concerns for the removal of Methylene blue dye using GG-g-PAA superabsorbent nanocomposite. The adsorption behavior of dye was studied using batch techniques at different pH values. The synthesized superabsorbent composite (SAC) was found to be effective in removing methylene blue dye up to 90 % at pH 8.5. The effect of various variables such as dye concentration, contact time, adsorbent dose, pH etc. was analyzed. Study shows that the adsorption kinetics favors pseudo second order reaction kinetics. The process of adsorption of dye follows Langmuir and Freundlich model.
Antioxidants are molecules that battle against free radicals in the body. Free radicals are compounds that can damage the body if it gets too strong. They are associated with many illnesses such as diabetes, cardiovascular disease, and cancer etc. The body has its defense system against antioxidants to regulate free radicals. Antioxidants are also found in foods, particularly fruits, vegetables, and other substances based on herbs. Vitamins E and C are very important antioxidants. Plants have recently become a significant source of a surprising number of antioxidants that avoid the oxidative stress of free radicals. Natural chemicals, particularly those from medicinal plants, give many beneficial antioxidants. Antioxidant preservatives also play the main role in rising shelf life in food processing. Alcohol, green tea, cocoa, and dark chocolate are popular as strong antioxidant sources. Antioxidants can increase the self-life of both natural and processed foods. As a result, they're commonly employed as food additives. In these cases, the activity has been increased by the increasing use of three different methods.This review aims to determine the antioxidant activity of historically beneficial and modern medicinal plants.
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