Chun Cao,Hongliang Kang,Ning Che,Zhijing Liu,Pingping Li,Chao Zhang,Weiwei Li,Ruigang Liu,Yong Huang
Wool graft polyacrylamidoxime (W-g-PAO) was synthesized using coarse wool as the raw keratin material and the graft polymerization parameters were optimized. The adsorption properties of W-g-PAO for both cationic and anionic toxic ions from aqueous solutions were investigated. It was found that both cationic and anionic toxic ions can be effectively adsorbed by W-g-PAO. The adsorption followed the pseudo-second-order kinetics model for both cations and anions, and can be well depicted by Langmuir isotherm model. The equilibrium adsorption capacity (Qe) increases with the rising initial concentration of toxic ions. The adsorption capacity followed the order of Hg2+ > Pb2+ > AsO2− > AsO43− > Cd2+. W-g-PAO can be regenerated after adsorption, and the adsorption capacity slightly decreased with the increase in the regenerated cycles. Besides providing a cheap and excellent adsorbent for the removal of both cationic and anionic toxic ions from waste water, the method can be extended to the modification of other waste raw keratin materials, by which the waste raw keratin materials can be used as a valuable blocks for the fabrication of functional materials.
The development of new adsorbent materials to improve adsorption capacity and selectivity constitutes a significant research direction for removing toxic ions from water. In this study, a series of Zr-based metal–organic framework hierarchical porous nanofibre membranes (MOFs@PIM-W) was designed and successfully synthesised, and their adsorption properties and mechanism for fluoride ions in water were investigated. The formation of Zr–F bonds in Zr-based MOFs is a primary reason for the rapid, effective, and stable removal of fluoride ions from water. Moreover, in contrast to common powder adsorbents and the conventional static adsorption process, the obtained hierarchical porous nanofibre membranes improve the removal rate of fluoride ions, which may be attributed to the formation of hierarchical porous structures. Specifically, by modifying the types of MOFs, the obtained nanofibre membranes can effectively remove Hg(II) ions from water under a wide range of pH environments (pH = 2–10) with a removal rate of up to 99 %. This indicates that the hierarchical porous design of nanofibre membranes incorporated with their specific adsorption provides a viable option for rapidly and efficiently removing toxic ions from water.
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