吸附
化学
水溶液
热重分析
解吸
无机化学
水溶液中的金属离子
沸石咪唑盐骨架
活性炭
滴定法
金属有机骨架
金属
有机化学
作者
Imteaz Ahmed,Samiran Bhattacharjee,Chang-Soo Lee,Kyoung Ku Kang,Ji-Whan Ahn,Wha-Seung Ahn
标识
DOI:10.1016/j.jcis.2021.03.036
摘要
• COOH-functionalized carbon derived from ZIF-8 was applied for Nd 3+ adsorption. • A high maximum adsorption capacity of 175 mg/g was achieved after 4 h. • 77% of Nd 3+ selectivity among other metal ions was achieved. • Adsorption was due to coordination bonding between the Nd 3+ ions and COOH. • The adsorbent was highly recyclable after a simple acid solution washing. A porous graphitic carbon was obtained via the pyrolysis of a zeolite imidazolate framework (ZIF-8) under Ar atmosphere. Then, the carbon was functionalized with carboxylic groups and applied for separation of neodymium ions (Nd 3+ ) from water. The adsorbent (denoted as C-ZDC) was characterized by X-ray diffraction, N 2 adsorption–desorption isotherms, infrared spectroscopy, X-ray photoelectron spectroscopy, scanning and transition electron microscopies, thermogravimetric analysis, and Boehm titration. A practical adsorption equilibrium was attained within 4 h, and the adsorption isotherm at 25 °C revealed a maximum adsorption capacity of 175 mg/g, which is one of the highest values reported for different kinds of adsorbents. The adsorption kinetics and equilibrium isotherms were modeled, and the selectivity for Nd 3+ over other metal ions was examined. From the effect of solution pH on the adsorption and material characterization results before and after adsorption, the high adsorption capacity of C-ZDC was ascribed to the formation of coordination bonds between Nd 3+ ions and the –COOH groups. Further, the material was reusable for at least four adsorption–desorption cycles after a simple step of acid washing.
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