Zheng Mingming, Wang Jue, Fu Dong, Ren Binqiao, Song Xiaoxiao, Kan Kan, Zhang Xiaochen
Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China.
Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China.
J Hazard Mater. 2023 Jan 15;442:130068. doi: 10.1016/j.jhazmat.2022.130068. Epub 2022 Sep 26.
In this study, a new composite with layered double hydroxides (LDHs) anchored grown on expanded graphite (EG) interlayers was prepared by vacuum-assisted intercalation and hydrothermal method. Both sides of EG were completely covered by highly dispersed LDHs nanosheets and formed a sandwich-like structure. The unique structure made expanded graphite/layered double hydroxides (EG/LDHs) composites which had excellent F adsorption performance. The adsorption performance of F on EG/LDHs was evaluated, and the results indicated that the adsorption process was consistent with the pseudo-second-order kinetic model and the Langmuir model. Pseudo-second-order kinetic model indicated that the adsorption sites were the main factor in the adsorption process. Moreover, the maximum adsorption capacity (Q) reached 63.21 mg·g at 30 min at room temperature, which was better than most of the same type of adsorbents. The highly dispersed of LDHs anchored growth on EG overcame the disadvantage of aggregation, which exposed more adsorption sites and improved the removal efficiency of F. In addition, the effects of pH, anion interference, different water quality, and regeneration tests on the EG/LDHs composites were also analyzed, showing that the composites have good stability.
在本研究中，通过真空辅助插层和水热法制备了一种新型复合材料，该复合材料是在膨胀石墨（EG）层间锚定生长的层状双氢氧化物（LDHs）。EG的两面都被高度分散的LDHs纳米片完全覆盖，并形成了一种三明治状结构。这种独特的结构使得膨胀石墨/层状双氢氧化物（EG/LDHs）复合材料具有优异的氟吸附性能。对F在EG/LDHs上的吸附性能进行了评估，结果表明吸附过程符合准二级动力学模型和朗缪尔模型。准二级动力学模型表明吸附位点是吸附过程中的主要因素。此外，在室温下30分钟时最大吸附容量（Q）达到63.21mg·g，优于大多数同类吸附剂。LDHs在EG上的高度分散锚定生长克服了团聚的缺点，从而暴露出更多的吸附位点并提高了F的去除效率。此外，还分析了pH值、阴离子干扰、不同水质以及再生试验对EG/LDHs复合材料的影响，结果表明该复合材料具有良好的稳定性。
