Preparation Of Flower-like MeO/MeHCF Composites And Its Cs~+ Adsorption Performance

Radioactive cesium(Cs)ions pose a great threat to the environment and organisms due to their high energy radiation and long half-life.The removal of cesium ions by adsorption has the advantages of no secondary contamination,scalable application,and suitable for the re-moval of trace cesium ions,etc.Prussian blue-like adsorbent materials have the advantages of high capacity and high selectivity,and the adsorption performance can be improved by com-bining Prussian blue-like adsorbent with carrier materials.In this work,we prepared a variety of F-L Me O/Me HCF composites using metal oxides(F-L Me O,Me=Zn,Ni,Cu)with flower shape as carriers loaded with Prussian blue analogues(Me HCF,Me=Zn,Ni,Cu),and subse-quently studied the adsorption performance and adsorption mechanism of the prepared mate-rials,and the main results of the study are as follows:1.The flower-like Zn O was prepared by hydrothermal method and calcination treatment,and the flower-like Zn O/Zn HCF composite adsorbent was prepared by in situ synthesis.It was found that the amount of hydrochloric acid added in the preparation had the greatest effect on the composite and the best experimental conditions were found;the adsorption effect of the adsorbent was best at p H=7,and it could selectively adsorb cesium ions in the co-existence of multiple ion systems,with the maximum adsorption capacity up to 322.4 mg/g;the adsorp-tion kinetics satisfied the pseudo-second-order model,and the adsorption was dominated by chemisorption(mainly K~+exchange with cesium ions),with other The adsorption thermody-namics indicates that the adsorption is a spontaneous,heat-absorbing entropy-increasing pro-cess.After comparing with other reported Prussian blue-based adsorbents,it was concluded that the Zn O/Zn HCF composite adsorbent in this study has potential applications.2.In order to prevent the introduction of acid,flower-like Ni O was prepared by chemical deposition and calcination.The flower-like Ni O was prepared by chemical deposition and cal-cination treatment,and then the fancy Ni O/Ni HCF composites were prepared using the im-pregnation method.It was shown that the fine Ni HCF particles were attached to the three-dimensional folds of floral Ni O;the p H-neutral environment could obtain the best adsorption effect with a maximum adsorption capacity of 103.4 mg/g;the presence of other cations had little effect on the adsorption cesium of the material;the well-fitted pseudo-second-order ki-netic model indicated that the adsorption was dominated by chemisorption;and its adsorption was also spontaneous.3.The flower-like Cu O was prepared by alkali oxidation solution etch-assisted crystalli-zation method,and Cu O/Cu HCF composites were prepared by impregnation,and the results showed that Cu O/Cu HCF composites had a flower-like structure similar to Ni O/Ni HCF.Lang-muir fitting calculation shows that it has a larger adsorption capacity of 151.41 mg/g than Ni O/Ni HCF,which proves that the adsorption capacity of F-L Me O/Me HCF composites var-ies with the type of Me.From the results of the experiment,it can be seen that the use of F-L Me O/Me HCF com-posite adsorbent has the ability to remove radioactive cesium elements from nuclear waste from water.