radiation synthesis of novel hydrogel based on wheat flour for dyes removal

Abstract

A novel hydrogel based on wheat flour (F) and acrylic acid (AAc) was performed by gamma irradiation. The parameters that controlled the preparation conditions were studied including irradiation dose and hydrogel composition. Characterization of the produced hydrogel (F/AAc) was done by infrared spectroscopy to confirm the structure and the change in morphology was investigated by the scanning electron microscope. The thermal stability was also investigated using thermogravimetric analysis (TGA). The swelling properties were investigated in relation to time and irradiation dose. The developed hydrogel was used for the removal of Congo Red dye (CR) from aqueous solution. Effects of different operating parameters such as effect of pH, contact time, concentration of the dye and temperature on the adsorption capacity of the dye have been studied. It was found that marvelous adsorption capacities were obtained at pH 3. The adsorption capacity at pH 3 is 19.5 mg/g for (F/AAc) hydrogel contains (15wt% AAc) at 2.5 kGy, 17.3mg/g for (F/AAc) hydrogel contains (15wt% AAc) at 20 kGy, and 13.4 mg/g for (F/AAc) hydrogel contains (20 wt% AAc) at 20 kGy. The pseudo-second-order model and the Freundlich model describe well the adsorption kinetic and isotherm, respectively.

Bi doping starch-DMAEMA hydrgel for efficient removal of Sr(II)

“…Many wastewater treatment methods have been developed to remove heavy metal ions from wastewater, including solvent extraction, electrodialysis, filtration, photocatalysis, chemical precipitation, ion exchange, adsorption, membrane filtration, evaporation, electrolysis treatment technologies, chemical oxidation or reduction, electrodeposition, coagulation, sedimentation, filtration, reverse osmosis, cementation, flocculation, and complexation. The amount of heavy metals present in solution and the cost of treatment are both taken into consideration when choosing a wastewater treatment method [2,3]. Adsorption is seen as a superior technology for removing heavy metals from wastewater when compared to other conventional treatment methods because of its low cost, insensitivity to toxic pollutants, metal selectivity, ease of operation, stability, regenerative nature, flexibility and simplicity of design, and efficiency.…”