Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, PR China; Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huai River Water Environmental Pollution and Control, Ministry of Education, School of Environment, Henan Normal University, Xinxiang 453007, PR China.
Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, PR China.
J Hazard Mater. 2022 May 5;429:128384. doi: 10.1016/j.jhazmat.2022.128384. Epub 2022 Feb 1.
Lotus-like Ni@NiO embedded porous carbons (Ni@NiO/PCs) were fabricated by pyrolysis of MOF-74/cellulose nanocrystal hybrids, and used as a solid phase microextraction (SPME) coating for ultrasensitive determination of chlorobenzenes (CBs) from water combined with gas chromatography-mass spectrometry. Owing to its abundant chemical groups, high porosity, and excellent thermal stability, the as-prepared Ni@NiO/PCs presented superior extraction performance compared to commercial SPME coatings. Notably, Ni@NiO/PCs derived from MOF-74/CNC hybrids presented higher extraction efficiencies towards CBs than that derived from pristine CNC and MOF-74 due to the formation of micro/mesopores and more abundant oxygen-containing groups. Under the optimum extraction conditions, the proposed analytical method presented wide linearity range (0.5-1500 ng L), ultra-low detection of limit (0.005-0.049 ng L), and excellent precision with relative standard deviations of 4.7-9.2% for a single fiber and 8.8-10.9% for 5 fibers, and long lifetime (≥160 times). The proposed analytical method was finally applied for determination of CBs from real water samples, and the recoveries were in the range of 93.2-116.8% towards eight CBs. This study delivered a novel and efficient sorbent as SPME coating to extraction and determination of CBs from water.
莲花状的 Ni@NiO 嵌入多孔碳（Ni@NiO/PCs）是通过 MOF-74/纤维素纳米晶体杂化物的热解制备的，并与气相色谱-质谱联用，用作水相中氯苯（CBs）的固相微萃取（SPME）涂层，用于超灵敏测定。由于其丰富的化学基团、高孔隙率和优异的热稳定性，与商业 SPME 涂层相比，所制备的 Ni@NiO/PCs 具有优越的萃取性能。值得注意的是，由于形成了微孔/介孔和更多的含氧基团，源自 MOF-74/CNC 杂化物的 Ni@NiO/PCs 对 CBs 的萃取效率高于源自原始 CNC 和 MOF-74 的 Ni@NiO/PCs。在最佳萃取条件下，该方法的线性范围很宽（0.5-1500ng/L），检测限极低（0.005-0.049ng/L），精密度高，单个纤维的相对标准偏差为 4.7-9.2%，5 个纤维的为 8.8-10.9%，使用寿命长（≥160 次）。该方法最后用于测定实际水样中的 CBs，8 种 CBs 的回收率在 93.2-116.8%之间。本研究提供了一种新型高效的 SPME 涂层吸附剂，用于从水中萃取和测定 CBs。
