Graphene oxide encapsulated polyvinyl alcohol/sodium alginate hydrogel microspheres for Cu (II) and U (VI) removal.

Enhanced removal of bisphenol A from aqueous solution by aluminum-based MOF/sodium alginate-chitosan composite beads

Heavy metal pollution has become a major environmental concern because modern industries produce heavy metals in their effluents. Adsorption is regarded as an environmentally friendly way to clear industrial effluents from heavy metals because of its simplicity and low cost. As a natural polysaccharide containing abundant hydroxyl and carboxyl groups, sodium alginate has been widely reported to be a useful raw material for the adsorption of heavy metals from aque- ous solutions. Alginate-based materials have been limited in their industrial application because of their poor physical strength and thermostability. However, adsorbents synthesized from sodium alginate exhibit large uptake capacities as well as high removal rates of heavy metal ions following surface grafting and cross-linking. Specifically, this paper summarizes the development of sodium alginate-based composite materials, including their polymeric properties, modification, and their adsorption behaviors. The work investigated the adsorption mechanisms of differ- ent alginate-based composites for the removal of heavy metals such as Cu(II), Pb(II), and Cd(II). Alginate-based composites typically exhibit enhanced adsorption performance. The physical and chemical properties of alginate-based composites determine their effectiveness under different application conditions. A series of alginate-based composites and their physicochemical and adsorptive properties have been summarized. Finally, the limitations of sodium alginate-based adsorbents were discussed along with suggestions for future research.

/pdf/recent-advances-in-alginate-based-adsorbents-for-heavy-metal-11p1xpu0.pdf

Recent advances in alginate-based adsorbents for heavy metal retention from water: a review

Reduction of 4-nitrophenol by a disused adsorbent: EDA-functionalized magnetic cellulose nanocomposite after the removal of Cu2.

Recent advances of magnetic chitosan hydrogel: Preparation, properties and applications.

Copper in drinking water causes a significant environmental problem. Composite material based on alginate hydrogel has been gaining attention in the field of Cu(II) adsorption. However, alginate-based hydrogel exhibits poor mechanical property and relative low adsorption capacity which limit their application. The present study is devoted to the modification of chitosan/calcium alginate/Fe3O4 (CAF) hydrogel microsphere by NaOH solution for enhancement of Cu(II) adsorption. Results reveal that modification of CAF via NaOH solution significantly improves the mechanical strength and Cu2+ adsorption capacity of pristine materials. FTIR and XRD analysis confirms that CAF and newly prepared materials (NACAF) are successfully prepared. SEM and EDX are employed to analyze the surface morphology and elemental composition, respectively, both before and after their loading with Cu2+. XPS study demonstrates adsorption mechanism is based on chelation and ion-exchange. Compressive stress-strain curves demonstrate NACAF has better mechanical performance than CAF. The adsorption kinetics of the two adsorbents follow a pseudo-second-order model. The equilibrium data were best described by Langmuir isotherm model, and the estimated maximum equilibrium sorption capacity, q m,is 261.31 mg/g for the NACAF, which is larger than that of CAF (145.39 mg/g). Hence, NACAF shows excellent mechanical strength and high sorption capacity for Cu2+. It has great potential for Cu(II) removal in aqueous solutions.

Modification of chitosan/calcium alginate/Fe3O4 hydrogel microsphere for enhancement of Cu(II) adsorption.

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Modification of chitosan/calcium alginate/Fe3O4 hydrogel microsphere for enhancement of Cu(II) adsorption.