Functional Elastic Hydrogel as Recyclable Membrane for the Adsorption and Degradation of Methylene Blue

Abstract

Developing the application of high-strength hydrogels has gained much attention in the fields of medical, pharmacy, and pollutant removal due to their versatility and stimulus-responsive properties. In this presentation, a high-strength freestanding elastic hydrogel membrane was constructed by clay nanosheets, N, N-dimethylacrylamide and 2-acrylamide-2-methylpropanesulfonic acid for adsorption of methylene blue and heavy metal ions. The maximum values of elongation and Young’s modulus for 0.5% AMPSNa hydrogel were 1901% and 949.4 kPa, respectively, much higher than those of traditional hydrogels. The adsorptions were confirmed to follow pseudo-second kinetic equation and Langmuir isotherm model fits the data well. The maximum adsorption capacity of hydrogel towards methylene blue was 434.8 mg g−1. The hydrogel also exhibited higher separation selectivity to Pb2+ than Cu2+. The methylene blue adsorbed onto the hydrogel membrane can be photocatalytically degraded by Fenton agent and the hydrogel membrane could be recycled at least five times without obvious loss in mechanical properties. In conclusion, this presentation demonstrates a convenient strategy to prepare tough and elastic clay nanocomposite hydrogel, which can not only be applied as recyclable membrane for the photocatalytic degradation of organic dye, but also for the recovery of valuables.

In situ preparation of magnetic Fe3O4.Cu2O.Fe3O4/cryogel nanocomposite powder via a reduction–coprecipitation method as adsorbent for methylene blue water pollutant

“…Comparing q exp (mg g −1 ) of the present system with the reported data for crosslinked Na‐AMPS polymers, it was found that the maximum adsorption capacity of the hydrogel towards MB was 434.8 mg g −1 . Moreover, it is found that the Na‐AMPS/SS‐Na cryogel and composite adsorb MB in a very short time and with higher dye adsorption capacities.…”

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

“…Meanwhile, their resistance to dissolution is mainly due to the formation of cross-links between network chains [17]. As an adsorbent, the contaminants were captured between fine pores of hydrogel developed via crosslinking networks; hence, adsorbed [18]. The high-water-content and porous structure networks help to diffuse the solute through PVA hydrogel structure to trap the contaminants from wastewaters.…”

“…Oil palm trees are agricultural plants and play an important role in the economic growth of Malaysia. OPB is biomass waste that is produced after palm oil is removed from the palm fruit for oil production [18,19]. It was found that the addition of OPB could greatly enhance the polymer hydrogel durability via increasing the fiber medium adherence into the hydrogel by granting an irregular surface.…”

Organic/inorganic nanocomposite hydrogels

“…NC gels are mostly prepared with nonionic monomers, such as AM or its derivative, but the formed materials generally have a relative narrow range of application Liu et al, 2006;Xiong et al, 2008). Laponite was first preadsorbed by nonionic monomers before further polymerization of ionic monomers, such as AA (Huang, 2012), SA (Hu et al, 2011), MAA (Hu et al, 2011), SMA (Hu et al, 2011(Hu et al, , 2009, or AMPS (Bao et al, 2014). To combat this problem, two main strategies were developed: (1) Laponite could be preadsorbed by nonionic monomers before further copolymerization of ionic monomers and (2) choosing specific ionic monomers to realize the homodispersion of Laponite.…”