Carbon dots capped cerium oxide nanoparticles for highly efficient removal and sensitive detection of fluoride
Carbon dots capped cerium oxide nanoparticles for highly efficient removal and sensitive detection of fluoride
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DOI：
10.1016/j.jhazmat.2022.128976
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发表时间：
2022-04-23
影响因子：
13.6
通讯作者：
Xu, Ziqiang
中科院分区：
文献类型：
--
作者：
Meng, Song;Yao, Zhihao;Xu, Ziqiang
过量接触F-会对人体健康造成严重危害，因此对F-进行有效的吸附和灵敏的检测是至关重要的。因此，通过单宁酸和CeCl3的水热处理合成了碳点(CDS)修饰的CeO2(CeO2@CDS)。CeO2@Cd由于保留了丰富的酚羟基和良好的亲水性，具有较高的F-吸附容量。测定的分配系数参数(PC)为2.65 L/g，与前人的工作相当。动力学结果和吸附等温线分别符合准二级模型和Freundlich模型，表明化学吸附是吸附的主导，主要通过羟基和F-之间的离子交换。由于CeO2@CDS上存在酚羟基，因此即使在酸性条件下，CdS和CeO2的协同作用也有助于提高ROS的去除能力。此外，由于CeO2@CDS对ROS的清除能力可以被F-增强，因此可以用辣根过氧化物酶作为指示剂实现对F-的比色检测。线性范围为0.3-2.1 mm，检出限为0.13 mg/L。结果表明，CeO2@CDS在有效去除和灵敏检测与氟有关的污染问题和阐明解决其他阴离子相关问题方面具有潜在的潜力。
Since the excess exposure to F- may induce serious issues to human health, the effective adsorption and sensitive detection of F- is essential. Therefore, carbon dots (CDs) capped CeO2 (CeO2@CDs) was synthesized via hydrothermal treatment of tannic acid and CeCl3. Due to abundant phenolic hydroxyl are reserved and excellent hydrophilicity, CeO2@CDs possess high F- adsorption capacity. The partition coefficient parameters (PC) are determined to be 2.65 L/g, which is comparable with previous work. The kinetics results and adsorption isotherm are consistent with pseudo-second-order model and Freundlich model, respectively, indicating the chemisorption dominate the adsorption, mainly via the ion exchange between hydroxyl and F-. Since phenolic hydroxyl existed on the CeO2@CDs, synergetic effect of CDs and CeO2 contribute to superior ROS eliminating capacity, even at acidic conditions. Moreover, due to the ROS scavenging of CeO2 @CDs abilities can be potentiated by F-, colorimetric detection of F- can be realized via horseradish peroxidase as an indicator. The linear range is 0.3-2.1 mM with limit of detection is 0.13 mg/L. The current results imply that CeO2@CDs possess potential in both efficient removal and sensitive detection of F- related contamination issues and elucidation of development to address other anions related issues.