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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Unveiling the adsorption mechanism of zeolitic imidazolate framework-8 with high efficiency for removal of copper ions from aqueous solutions
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Unveiling the adsorption mechanism of zeolitic imidazolate framework-8 with high efficiency for removal of copper ions from aqueous solutions

机译：揭示了咪唑沸石-8分子筛从水溶液中去除铜离子的高效吸附机理

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摘要

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.
机译：在重金属离子中，铜（II）在高摄入量下会导致眼睛和肝脏受损。甚至低于0.1微克g（-1）的超低浓度的铜离子（Cu2 +）的存在也可能对生物体有毒。因此，非常需要开发有效的吸附剂以从水溶液中去除Cu 2+。在这项工作中，无需任何表面功能化或预处理，在室温下合成的水稳性沸石咪唑酸酯骨架（ZIF-8）直接用作从水溶液中去除铜离子的高效吸附剂。为了通过实验揭示ZIF-8对Cu2 +的吸附机理，我们从一系列重要因素（例如pH值，接触时间，温度和初始Cu2 +浓度）中探索了各种影响。结果，ZIF-8纳米晶体表现出出乎意料的高Cu2 +吸附能力，以及高和低浓度的Cu2 +从水中的去除效率。此外，ZIF-8纳米晶体具有快速的动力学，能够以不到30分钟的吸附时间去除Cu2 +。另外，溶液的pH为3至6对ZIF-8对Cu 2+的吸附几乎没有影响。首次提出了吸附机理，并通过TEM，FTIR，XPS，XRD和SEM等各种表征技术进行了系统验证。

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