Abstract

In this work, we report the synthesis of a Cu (II) based metal–organic frameworks (HKUST-1) by mechanochemical method and metal-oxide–carbon nanocomposite (CuO@C) as thermolysis products. The prepared HKUST-1 and composite were characterized by elemental CHNS/O microanalysis, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM–EDX), transmission electron microscopy (TEM), ultraviolet–visible spectroscopy (UV–vis), thermogravimetric analyses (TGA), fourier-transform infrared spectroscopy (FTIR), powder X-ray diffraction (PXRD) and Brunauer–Emmett–Teller (BET) analysis. The TEM analysis, confirmed the CuO nanoparticles in the porous carbon matrix. The synthesized compounds were further investigated for adsorption of Cd (II) from aqueous solution. The composite exhibited a high cadmium uptake of 132.6 mg g⁻¹ compared to the parent HKUST-1, and fast kinetics with a kinetic rate constant k₂ of 0.031 g mg⁻¹ min⁻¹, which is greater than some existing adsorbents for cadmium adsorption from aqueous solution under similar condition. The cadmium adsorption on CuO@C composite showed pH, temperature and time dependence to the prepared HKUST-1, as well as greater surface area and pore volume. The CuO@C composite can be readily recycled and regenerated without significant loss of the cadmium adsorption capacity.

中文翻译：

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铜（II）配位聚合物的热转化成氧化铜-碳纳米复合材料，用于从水溶液中选择性去除镉（II）

摘要

在这项工作中，我们报告了通过机械化学方法和金属氧化物-碳纳米复合材料（CuO @ C）作为热解产物合成了基于铜（II）的金属-有机骨架（HKUST-1）。通过元素CHNS / O显微分析，配备能量色散X射线光谱（SEM-EDX）的扫描电子显微镜，透射电子显微镜（TEM），紫外可见光谱（UV-vis），热重分析（TGA），傅立叶变换红外光谱（FTIR），粉末X射线衍射（PXRD）和Brunauer–Emmett–Teller（BET）分析。TEM分析证实了多孔碳基质中的CuO纳米颗粒。进一步研究了合成的化合物从水溶液中吸附Cd（II）的能力。该复合材料显示出132.6 mg g的高镉吸收量与母体HKUST-1相比，^-1，动力学速率常数k ₂为0.031 g mg ^-1  min ^-1的快速动力学，其大于在相似条件下从水溶液中吸附镉的某些现有吸附剂。镉在CuO @ C复合材料上的吸附表现出pH，温度和时间对制备的HKUST-1的依赖性，以及更大的表面积和孔体积。CuO @ C复合材料可以很容易地回收利用和再生，而不会显着降低镉的吸附能力。