The extensive utilization of fluorine industrial products has brought abundant fluorine pollution. The fluorine removal is important. In this study, CaO, as a novel coprecipitator, was conducted to synthesize Ca‐Fe‐SO4 layered double hydroxide (CF) via co‐precipitation of FeSO4. Ca‐Fe mixed metal oxide adsorbent (CCF) was fabricated by calcinating CF for efficient fluoride adsorption. The results showed that CCF adsorbent had an excellent adsorption performance for fluoride. It was attributed to two reasons as follows: On one hand, Ca had a strong affinity for fluoride, improving the adsorption capacity of adsorbent for fluoride. On the other hand, Fe had a strong magnetism, which could promote the recovery of the adsorbed material. The adsorption capacity of CCF for fluorine was analyzed by batch adsorption experiments, the adsorption capacity was 160.66 mg/g at temperature of 298 K and pH of 7. Moreover, the adsorption process of fluorine and the actual adsorption process were in accordance with Langmuir model and the pseudo‐second‐order kinetic model, respectively. According to the analysis of pHzpc, FITR and XPS, the main adsorption mechanisms of CCF for fluoride in water were complexation and electrostatic interactions. Therefore, this study suggested that CaO can be a novel coprecipitator to prepare a new efficient fluorine adsorbent for the treatment of industrial wastewater.
In this paper, Co 3 O 4 /Ce(OH) 4 /C and Co 3 O 4 /CeO 2 /C cathode materials for sodium-ion batteries are prepared by electroconversion. The morphology, structure, and electrochemical properties are investigated by X-ray diffraction, scanning electron microscopy, cyclic voltammetry, charge-discharge test, etc. The results show that Co 3 O 4 /Ce(OH) 4 /C and Co 3 O 4 /CeO 2 /C have the same crystal structure, the diffraction peaks of the samples are sharp, and the material crystallinity is high, and both are of nanospherical porous morphology. In electrochemical performance, the first discharge-specific capacities of Co 3 O 4 /Ce(OH) 4 /C and Co 3 O 4 /CeO 2 /C are as high as 185.7 and 94.2 mAh g −1 at a rate of 0.1 A g −1 . Moreover, the specific capacity of Co 3 O 4 /Ce(OH) 4 /C and Co 3 O 4 /CeO 2 /C increases after 1000 cycles at the 0.5 A g −1 rates, and the coulombic efficiency remains around 100%, showing excellent cycle performance.
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