Magnetic Nanocomposite Hydrogel Prepared by ZnO-initiated Photopolymerization for La (III) Adsorption

Abstract

Here, we provide an effective method to fabricate magnetic ZnO clay nanocomposite hydrogel via the photopolymerization. The inorganic components endow the hydrogel with high mechanical strength, while the organic copolymers exhibit good adsorption capacity and separation selectivity to La (III) ions. An optimized hydrogel has the maximum compressive stress of 316.60±15.83 kPa, which still exhibits 138.98±7.32 kPa compressive strength after swelling. The maximum adsorption capacity of La ion is 58.8 mg/g. The adsorption matches the pseudo-second-order kinetics model. La (III) ions can be effectively separated from the mixtures of La/Ni, La/Co, La/Cu, and La/Nd in a broad pH range (2.0 to 8.0). After six adsorption-desorption cycles, the hydrogel can maintain its adsorption capacity. This work not only provides a new approach to the synthesis of tough hydrogels under irradiation, but also opens up enormous opportunities to make full use of magnetic nanocomposite hydrogels in environmental fields.

Monolithic supermacroporous hydrogel prepared from high internal phase emulsions (HIPEs) for fast removal of Cu 2+ and Pb 2+

“…Owing to their unique 3D network structure and tailored large amounts of functional groups, hydrogels have received increasing attention as one kind of excellent adsorbents in recent years. As a continuing study on granular hydrogels [36][37][38], a series of monolithic porous hydrogels were prepared to improve further the adsorptive properties. Subsequently, these monolithic porous hydrogels were used as the adsorbents to remove heavy metal ions Cu 2+ and Pb 2+ from aqueous solution.…”

Magnetic graphene oxide grafted with different hydrophobic chain lengths low‐generation polyamidoamine dendrimers for adsorption of Pb(II) and Hg(II) in aqueous solution

“…To further study the relationship between metal ions in the solution and the adsorbents, we introduce the adsorption isotherm models of Langmuir and Freundlich, the equations are expressed as Eqs. and : where C e (mg·L −1 ) is the equilibrium concentration of metal ions in aqueous solution. Q e (mg·g −1 ) corresponds to the adsorption capacity at C e .…”

“…To further study the relationship between metal ions in the solution and the adsorbents, we introduce the adsorption isotherm models of Langmuir and Freundlich, the equations are expressed as Eqs. 6 and 7 [38,39]:…”

Self‐Healing Hydrogel of Poly (vinyl alcohol)/Agarose with Robust Mechanical Property

“…Therefore, hydrogels, poor mechanical properties or lack of self‐healing performance, will hinder in some areas. Up to now, many well‐represented hydrogels have developed, such as the luminescent hydrogel, magnetic hydrogel, etc . Although many hydrogels have one of these characteristics, very few hydrogels with both of these properties, and the development of hydrogels that combine mechanical performance and self‐healing remains an ongoing challenge …”