Abstract
Dually crosslinked graphene oxide reinforced alginate/polyvinyl alcohol (PVA) double network (DN) hydrogels were prepared via a facile freeze/thaw method followed by soaking in a Ca2+ solution. The morphology and structure of the hydrogels were systematically examined by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The effects of pH, dosage of hydrogel, adsorption time, and temperature on the adsorptive property of DN hydrogels towards methylene blue (MB) were also studied. Results indicated that the hydrogels exhibited typical 3D porous structures and had an efficient adsorption effect towards MB due to strong interactions between DN hydrogels and MB molecules. The adsorption isotherm was found to coincide with the Langmuir model with a monolayer adsorption. The highest adsorption capacity of DN hydrogels for MB was examined as 480.76 mg·g−1.
Highlights
Water pollution originating from all kinds of organic dyes is on the rise due to the rapid development of printing, dyeing, and chemical industry
We report a graphene oxide reinforced Sodium alginate (SA)/polyvinyl alcohol (PVA) double network (DN) hydrogel for Methylene blue (MB) adsorption application via a facile freeze/thaw method followed by soaking in a Ca2+ solution
MB adsorption experiment was performed by shaking a certain mass of graphene oxide (GO) reinforced DN
Summary
Water pollution originating from all kinds of organic dyes is on the rise due to the rapid development of printing, dyeing, and chemical industry. Is a biological linear natural polymer with the merits of biodegradability, low-cost, and non-toxic properties as well as a wealth of sources. It has been widely studied in wastewater treatment applications because of its preferable adsorption property [10,11]. Many investigations have reported that DN hydrogels exhibited improved mechanical properties and high adsorption capacities for heavy metals and dyes [12,13,14]. There have been few studies conducted to examine the influence of graphene sheets on DN hydrogels Based on these considerations, we report a graphene oxide reinforced SA/PVA DN hydrogel for MB adsorption application via a facile freeze/thaw method followed by soaking in a Ca2+ solution. The incorporation of graphene oxide sheets into the hydrogels further enhanced the mechanical property, and affected the morphology of the DN hydrogels, yielding smaller pore size and larger pore density
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