Journal
DALTON TRANSACTIONS
Volume 45, Issue 32, Pages 12653-12660Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6dt01827k
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Funding
- Project for Science and Technology Service of Chinese Academy of Sciences [KFJ-SW-STS-172]
- National Natural Science Foundation of China [U1507104]
- aided program for Science and Technology Innovative Research Team of Ningbo Municipality [2014B82010, 2015B11002]
- Zhejiang Provincial Natural Science Foundation of China [R5110230]
- Hundred Talents Program of Chinese Academy of Sciences [2010-735]
- Chevron Innovative Research Fund (CIRS) at Louisiana State University
- Economic Development Assistantship (EDA) at Louisiana State University
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Among the heavy metal ions, copper(II) can cause eye and liver damage at high uptake. The existence of copper ions (Cu2+) even with an ultralow concentration of less than 0.1 mu g g(-1) can be toxic to living organisms. Thus, it is highly desirable to develop efficient adsorbents to remove Cu2+ from aqueous solutions. In this work, without any surface functionalization or pretreatment, a water-stable zeolitic imidazolate framework (ZIF-8) synthesized at room temperature is directly used as a highly efficient adsorbent for removal of copper ions from aqueous solutions. To experimentally unveil the adsorption mechanism of Cu2+ by using ZIF-8, we explore various effects from a series of important factors, such as pH value, contact time, temperature and initial Cu2+ concentration. As a result, ZIF-8 nanocrystals demonstrate an unexpected high adsorption capacity of Cu2+ and high removal efficiency for both high and low concentrations of Cu2+ from water. Moreover, ZIF-8 nanocrystals possess fast kinetics for removing Cu2+ with the adsorption time of less than 30 min. In addition, the pH of the solution ranging from 3 to 6 shows little effect on the adsorption of Cu2+ by ZIF-8. The adsorption mechanism is proposed for the first time and systematically verified by various characterization techniques, such as TEM, FTIR, XPS, XRD and SEM.
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