Adsorptive removal of Congo red from aqueous solution using zeolitic imidazolate framework–67
Adsorptive removal of Congo red from aqueous solution using zeolitic imidazolate framework–67
复制标题
DOI：
10.1016/j.jece.2018.03.031
复制
发表时间：
2018-04
影响因子：
7.7
通讯作者：
N. T. Tu;Tran Vinh Thien;P. Du;Võ Thị Thanh Châu;Tran Xuan Mau;Dinh Quang Khieu
中科院分区：
文献类型：
--
作者：
N. T. Tu;Tran Vinh Thien;P. Du;Võ Thị Thanh Châu;Tran Xuan Mau;Dinh Quang Khieu
研究了咪唑骨架分子筛ZIF-67对刚果红染料的吸附行为。采用微波法合成了ZIF-67。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、热重分析（TG）和X射线光电子能谱（XPS）对ZIF-67进行了表征。采用ZIF-67对CGR进行吸附。采用一级和二级动力学模型、Weber的颗粒内扩散模型和Boyd的膜扩散模型对吸附动力学进行了研究。用Langmuir和Freundlich模型对不同温度下的平衡吸附数据进行了解释。还讨论了301 ~ 331 K的热力学。ZIF-67在有利的热力学、超高吸附和极好的快速动力学方面表现出优异的吸附。ZIF-67对CGR的吸附容量在301 K时可高达714.3 mg g− 1，在较高温度下可提高。此外，ZIF-67对罗丹明B和亚甲基蓝等其他染料也表现出很高的吸附能力。ZIF-67稳定性好，可多次重复使用。这些特性使ZIF-67成为去除水中染料的最有前途的吸附剂之一。
In the present paper, the Congo red dye (CGR) adsorption onto zeolitic imidazolate framework–67 (ZIF–67) is demonstrated. ZIF–67 was synthesized using the microwave method. The obtained ZIF–67 was characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), thermal gravity analysis (TG), and X-ray photoelectron spectroscopy (XPS). ZIF–67 was employed to adsorb CGR from aqueous solutions. The first-order and second-order kinetic model, and Weber’s intra-particle-diffusion and Boyd’s film-diffusion model were utilized to study the adsorption kinetics. The equilibrium adsorption data at different temperatures were interpreted using the Langmuir and Freundlich models. The thermodynamics from 301 K to 331 K was also addressed. ZIF–67 exhibited excellent adsorption in terms of favourable thermodynamics, ultra-high adsorption and superb fast kinetics. The adsorption capacity of ZIF–67 for CGR could be as high as 714.3 mg g−1at 301 K, which could be improved at higher temperatures. In addition, ZIF–67 also exhibited very high adsorption for some other dyes such as rhodamine B and methylene blue. ZIF–67 was stable and could also be conveniently reused for several times. These peculiarities facilitate ZIF–67 to become one of the most promising adsorbents to remove dyes from water.