Application of Carbonized Metal-Organic Framework as Efficient Adsorbent of Cationic Dye
Application of Carbonized Metal-Organic Framework as Efficient Adsorbent of Cationic Dye
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DOI：
10.1021/acs.iecr.7b03790
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发表时间：
2018-04-11
影响因子：
4.2
通讯作者：
Mijowska, Ewa
中科院分区：
文献类型：
--
作者：
Barylak, Martyna;Cendrowski, Krzysztof;Mijowska, Ewa
在此，我们报道了罗丹明 B 在含钴金属有机骨架 (CoOF) 上的吸附动力学研究。 CoOF 可以从重复使用的废弃有机配体和溶剂中成功生产。在测试之前将所制备的材料碳化并纯化。采用扫描电镜、傅里叶变换红外分光光度计、X射线衍射仪、热重分析、拉曼光谱仪、N-2吸附/解吸等温线对吸附剂进行了表征。使用紫外-可见分光光度计检查染料吸附到结构上的动力学。在吸附技术中研究了各种物理化学参数，例如初始染料浓度、染料溶液的pH值和温度。发现吸附量随着初始染料浓度的增加而增加。当溶液变为碱性、pH 7 时的最佳条件时，注意到吸附容量增加。结果表明，随着温度的升高，吸附容量下降。 CoOF 上 RhB 的最大单层吸附容量为 72.150 mg/g。使用准一级动力学模型、准二级动力学模型和颗粒内扩散模型对动力学吸附数据进行分析。使用伪二级动力学模型可以很好地拟合吸附动力学。通过Langmuir和Freundlich吸附等温线对实验数据进行分析。平衡数据与 Freundlich 等温线非常吻合。测定了吉布斯自由能、焓和熵等热力学参数。结果发现，CoOF 上的 RhB 吸附是自发的放热物理吸附。
Herein, we report study about adsorption kinetics of rhodamine B onto metal organic framework containing cobalt (CoOF). The CoOF can be successfully produced from the reused waste-organic ligands and solvents. The as-prepared material was carbonized and purified prior to testing. The adsorbent was characterized with scanning electron microscopy, Fourier transform infrared spectrophotometer, X-ray diffractometer, thermogravimetric analysis, Raman spectroscope, and N-2 adsorption/desorption isotherms. The kinetics of dye adsorption onto structure was examined with the UV-Vis spectrophotometer. Various physiochemical parameters such as initial dye concentration, pH of dye solution, and temperature were investigated in an adsorption technique. The adsorption uptake was found to increase with increase in initial dye concentration. An increase in adsorption capacity was noticed when the solution was changed to basic, optimum conditions obtained at pH 7. The results indicate that along with an increase in the temperature the adsorption capacities decrease. The maximum monolayer adsorption capacity of RhB onto CoOF was 72.150 mg/g. Kinetic adsorption data were analyzed using the pseudo-first-order kinetic model, the pseudo- second-order kinetic model, and the intraparticle diffusion model. The adsorption kinetics well fit using a pseudo-second-order kinetic model. The experimental data were analyzed by the Langmuir and Freundlich adsorption isotherms. Equilibrium data fit well with the Freundlich isotherm. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were determined. It was found that the adsorptions of RhB onto CoOF was a spontaneous and exothermic physisorption.