A novel S-doped PB/GO nanocomposite for efficient adsorption and removal of cesium ions
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A novel S‑doped PB/GO nanocomposite for efficient adsorption and removal of cesium ions Wei Zheng1 · Sheng Feng1 · Shanshan Feng1 · Ziqiu Ni1 · Cong Shao1 Received: 11 December 2019 / Accepted: 13 September 2020 / Published online: 19 October 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract A novel sulfur-doped Prussian blue/graphene oxide (PB/GO-S) nanocomposite was designed and fabricated to remove cesium ions (Cs+) from water. Its maximum adsorption capacity was 175.72 mg g–1. And the adsorbent exhibited high selectivity to Cs+ in the presence of competing ions (sodium and potassium) and can reach adsorption equilibrium in less than 2 h. The adsorption behavior was consistent with Langmuir isotherm and pseudo-second-order kinetic model. In the adsorption process, both temperature and pH affect the adsorption performance, while the physical and chemical properties of the nanocomposite were stable in the pH range of 4–10. Keywords Sulfur · Prussian blue · Adsorption · Cesium ions
Introduction The disposal of nuclear waste has become one of the major factors restricting the development of the nuclear industry, of which radioactive cesium is the main pollutant in the waste [1, 2]. Radioactive cesium mainly includes three isotopes of 134Cs, 135Cs, and 137Cs, all of which have serious radiological hazards and long half-lives [3]. In addition, its good water solubility makes it easy to incorporate into terrestrial and aquatic environments. When radioactive cesium flows rapidly through the environment and food chain, it can enter the body and be enriched [4–6]. High doses of 137Cs can induce medullary dystrophy, reproductive dysfunction, and adverse effects on liver and kidney function, leading to damage or death of cells and cancer. The disposal of nuclear materials has become one of the major factors restricting the development of the nuclear industry, with radioactive cesium as the main representative. Based on the nature of cesium ions, it is urgent to develop simple and effective * Sheng Feng [email protected] Wei Zheng [email protected] Ziqiu Ni [email protected] 1
School of Environmental and Safety Engineering, Changzhou University, Jiangsu 213164, China
removal techniques to remove cesium ions. Currently available cesium treatment technologies include solvent extraction [7], chemical precipitation, membrane filtration, evaporation and adsorption. Among them, adsorption is widely used in cesium removal due to its high removal efficiency, simple process, low concentration applicability and costeffectiveness [8]. Prussian blue (PB) is highly selective for the removal of cesium [9–15], which has a cage size similar to that of Cs+ (3.25 Å) [16], so it has been widely used for Cs+ removal since the 1987 Chemobyl disaster [17]. However, its high water solubility makes it difficult to recycle and causes secondary pollution. In order to overcome the above disadvantages, PB is supported on a highly stable graphene oxide (GO) surface. The literature indicates that the coagulation of cations/GO has a syn
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