Shi Feng,Wenbo Yang,Lijing Zhang,Xintong Wang,Sifang Wang,Shengyang Tao
Inspired by the bone-seeking property of radioactive strontium (Sr) isotopes, we have prepared casein-hydroxyapatite-(aminomethyl)phosphonic acid (CS-HAP-AMPA) composite microspheres that share similar components with bone tissues and investigated their capacity to adsorb strontium ions (Sr2+) from contaminated water. These prepared microspheres are hollow with an orifice on the surface that can be easily manufactured by microfluidic technology. According to the experiments, the proper morphology of microspheres improves the adsorption capacity, and the maximum adsorption capacity is ≤231.22 mg/g compared with traditional adsorbents. In addition, the composite microspheres are capable of capturing the Sr2+ selectively and rapidly. The results reveal that the composite microspheres have great potential in capturing and immobilizing Sr2+ from contaminated water.
Lin Zhang,Ying Lu,Ying-Ling Liu,Ming Li,Hai-Yang Zhao,Li-An Hou
Graphene oxide (GO)-based membranes provide an encouraging opportunity to support high separation efficiency for wastewater treatment. However, due to the relatively weak interaction between GO nanosheets, it is difficult for bare GO-based membranes to survive in cross-flow filtration. In addition, the permeation flux of the bare GO membrane is not high sufficiently due to its narrow interlayer spacing. In this study, GO membranes interlinked with multi-walled carbon nanotubes (MWCNTs) via covalent bonds were fabricated on modified polyacrylonitrile (PAN) supports by vacuum filtration. Due to the strong bonds between GO, MWCNTs and the PAN membrane, the membranes could be used for the treatment of simulated nuclear wastewater containing strontium via a cross-flow process. The result showed a high flux of 210.7 L/(m 2 h) at 0.4 MPa, which was approximately 4 times higher than that of commercial nanofiltration membranes. The improved water permeation was attributed to the nanochannels created by the interlinked MWCNTs in the GO layers. In addition, the hybrid membrane exhibited a high rejection of 93.4% for EDTA-chelated Sr 2+ in an alkaline solution, and could also be used to separate Na + /Sr 2+ mixtures. These results indicate that the MWCNTs-interlinked GO membrane has promising prospects for application in radioactive waste treatment.
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