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Kinetics and isotherm studies for adsorptive removal of methylene blue from aqueous solutions using organoclay
Indian Journal of Chemical Technology ( IF 0.5 ) Pub Date : 2021-03-16
Pooja Patanjali, Indu Chopra, Abhishek Mandal, Rajeev Singh

The presence of dyes in various industrial effluents has emerged as a global environmental concern. The removal of dyes from effluents thus becomes essential to reduce their risks to different life forms. Keeping this in view, raw bentonite (Ben) has been modified with hexadecyltrimethylammonium bromide (HDTMA-Br) by cation exchange to form HDTMA modified bentonite (HDTMA-Ben). Both Ben and HDTMA-Benwere analyzed using Brunauer–Emmet–Teller (BET) method, Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and Thermogravimetric analysis (TGA). Studies are conducted at room temperature to determine the behaviour of Ben and HDTMA-Ben towards the adsorptive removal of Methylene blue (MB) from aqueous solutions. Thermodynamics studies were carried out to assess the effect of temperature on adsorption behaviour of both the adsorbents. The experimental adsorption capacity of HDTMA-Ben at equilibrium time was found to be 93.14 mg g-1. Characterization results revealed insertion of alkylammonium chain in between the layers of bentonite. Thermodynamics data indicated that the adsorption is spontaneous, exothermic and enhanced on increasing temperature. HDTMA-Ben showed higher dye removal efficiency in comparison to Ben under all conditions. The adsorption data of both the adsorbents was better explained by Freundlich isotherm whereas the pseudo-second-order (PSO) model explained the adsorption kinetics of the adsorbents.

中文翻译:

动力学和等温线研究使用有机粘土从水溶液中吸附去除亚甲基蓝

染料在各种工业废水中的存在已成为全球环境关注的焦点。因此,从废水中去除染料对于降低其对不同生命形式的风险至关重要。考虑到这一点,未加工的膨润土(Ben)已通过十六烷基三甲基溴化铵(HDTMA-Br)通过阳离子交换进行了改性,从而形成了HDTMA改性的膨润土(HDTMA-Ben)。Ben和HDTMA-Benwe均使用Brunauer-Emmet-Teller(BET)方法,扫描电子显微镜(SEM),X射线衍射(XRD),傅里叶变换红外(FT-IR)光谱和热重分析(TGA)进行了分析。在室温下进行研究以确定Ben和HDTMA-Ben对从水溶液中吸附去除亚甲基蓝(MB)的行为。进行了热力学研究,以评估温度对两种吸附剂吸附行为的影响。发现HDTMA-Ben在平衡时间的实验吸附容量为93.14 mg g-1。表征结果表明在膨润土层之间插入了烷基铵链。热力学数据表明,吸附是自发的,放热的,并且随着温度的升高而增强。与Ben相比,HDTMA-Ben在所有条件下均显示出更高的染料去除效率。两种吸附剂的吸附数据可以通过Freundlich等温线更好地解释,而伪二级(PSO)模型可以解释吸附剂的吸附动力学。
更新日期:2021-03-16
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