Modified bentonite adsorption of organic pollutants of dye wastewater
Modified bentonite adsorption of organic pollutants of dye wastewater
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DOI：
10.1016/j.matchemphys.2017.09.028
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发表时间：
2017-12-01
影响因子：
4.6
通讯作者：
Zhang, Yuxin
中科院分区：
文献类型：
--
作者：
Huang, Zhihui;Li, Yuzhen;Zhang, Yuxin
研究了有机改性膨润土对罗丹明B（RhB）和酸性红1的去除效果。用十六烷基三甲基溴化铵（CTAB）取代钠膨润土（Na-BT）中的可交换钠离子合成了有机膨润土，并系统地探讨了其作为去除染料的高效吸附剂的吸附行为。批吸附研究表明，染料的最大吸附容量被发现是173.5 mg/g和157.4 mg/g的RhB和酸性红1，在初始浓度为300 mg/L，在30 ℃和pH 9和8，分别为。吸附等温线和动力学模型研究表明，吸附等温线符合Langmuir等温式，吸附动力学符合准二级动力学模型。热力学参数表明吸附过程是自发的吸热过程。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、比表面积（BET）、傅里叶变换红外光谱（FT-IR）和zeta电位分析等手段对样品进行了表征。表征的结果提供了形态学性质和吸附过程如何进行的证据。(C)2017爱思唯尔B. V.保留所有权利。
Removals of Rhodamine B (RhB) and Acid red 1 using the organic modification of bentonite from aqueous phase were optimized. The organobentonite was synthesized by replacing exchangeable Na+ ions in Nabentonite (Na-Bt) with cetyl trimethylammonium bromide (CTAB) and systematically explored for its adsorption behavior as an efficient adsorbent for the removal of dyes. Batch adsorption studies manifested that the maximum adsorption capacity of dyes were found to be 173.5 mg/g and 157.4 mg/g for RhB and Acid red 1 at the initial concentration of 300 mg/L at 30 degrees C and pH 9 and 8, respectively. The investigations of adsorption isotherm and kinetics model showed that the adsorption isotherm data were fitted well to the Langmuir isotherm and the adsorption kinetic was better by pseudo-second-order kinetic model. Besides, the thermodynamic parameters indicate that the adsorption process is spontaneous and endothermic. Furthermore, the properties of the obtained samples were characterized by Xray diffraction (XRD), Scanning electronic microscopy (SEM), Brunauer-Emmett-Teller (BET), Fourier transform infrared spectrometry (FT-IR) and zeta potential analysis. The results of the characterization provided evidence of the morphological properties and how well the adsorption process performed. (C) 2017 Elsevier B.V. All rights reserved.