In the present study, cetyltrimethylammonium bromide (CTAB) was used to modify raw bentonite (Ben) through the replacement of exchangeable cations to form CTAB modified bentonite (CTAB−Ben). Both Ben and CTAB−Ben were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and Brunauer-Emmet-Teller (BET) analysis. Adsorption potential of Ben and CTAB−Ben were explored for the removal of two cationic dyes i.e. Rhodamine B (RB) and Crystal violet (CV) from aqueous solutions. The maximum dye adsorption capacity of CTAB−Ben was found to be 93.15 and 14.76 mgg^-1 for CV and RB, respectively. The adsorption data of both the adsorbents was better explained by Freundlich isotherm whereas the pseudo second order (PSO) model better fitted the kinetics data. Regeneration studies revealed that CTAB−Ben could be reused upto five adsorption-desorption cycles.

中文翻译：

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有机膨润土作为一种高效可重复使用的吸附剂，用于从水溶液中去除阳离子染料

在本研究中，十六烷基三甲基溴化铵（CTAB）用于通过交换可交换阳离子的改性来改性未加工的膨润土（Ben），以形成CTAB改性的膨润土（CTAB-Ben）。Ben和CTAB-Ben均使用扫描电子显微镜（SEM），X射线衍射（XRD），傅立叶变换红外（FT-IR）光谱和Brunauer-Emmet-Teller（BET）分析进行表征。研究了Ben和CTAB-Ben的吸附潜力，用于从水溶液中去除两种阳离子染料，即若丹明B（RB）和结晶紫（CV）。发现CTAB-Ben的最大染料吸附容量为93.15和14.76 mgg ^-1分别用于CV和RB。两种吸附剂的吸附数据可以通过Freundlich等温线更好地解释，而伪二阶（PSO）模型可以更好地拟合动力学数据。再生研究表明，CTAB-Ben可以重复使用多达五个吸附-解吸循环。