Abstract In this paper, acid-activated palygorskite (APal x ) samples were prepared by a facile acid treatment method with different concentrations of HCl (0.5, 1, 3, 5 and 7 mol/L). The dynamic toluene adsorption performances of APal x were evaluated and the relevant adsorption mechanism was discussed. The prepared adsorbents were characterized using X-ray diffraction (XRD), elemental analysis, transmission electron microcopy (TEM), nitrogen adsorption-desorption isotherms and Fourier-transform infrared spectroscopy (FTIR). The results show that the palygorskite has a good resistant ability to acid attack, the structure still remains when the acid concentration is as high as 7 mol/L. Acid activation could significantly enhance the surface area (228, 250, 271, 273, 329 and 308 for Pal, APal0.5, APal1, APal3, APal5 and APal7, respectively) and porosity of palygorskite. APal5 has the best toluene adsorption capacity (90.4 mg/g) due to its highest S BET (329 m 2 /g) and V micro (0.055 cm 3 /g). The adsorption performance in terms of dynamic toluene adsorption capacities follows the order of Pal (44.6 mg/g) x to become a promising candidate for the adsorption of volatile organic compounds in practical applications.

中文翻译：

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坡缕石酸活化对其甲苯吸附行为的影响

摘要 本文采用不同浓度的HCl（0.5、1、3、5和7 mol/L）采用简便的酸处理方法制备酸活化坡缕石（APal x ）样品。评价了APal x 的动态甲苯吸附性能并讨论了相关的吸附机理。使用X射线衍射（XRD）、元素分析、透射电子显微镜（TEM）、氮吸附-解吸等温线和傅里叶变换红外光谱（FTIR）对制备的吸附剂进行表征。结果表明，坡缕石具有良好的耐酸蚀能力，当酸浓度高达7 mol/L时，该结构仍然存在。酸活化可以显着增加表面积（Pal、APal0.5、APal1、APal3、APal5 和 APal7 的 228、250、271、273、329 和 308，分别）和坡缕石的孔隙率。由于其最高的 S BET (329 m 2 /g) 和 V micro (0.055 cm 3 /g)，APal5 具有最好的甲苯吸附能力 (90.4 mg/g)。在动态甲苯吸附容量方面的吸附性能遵循 Pal (44.6 mg/g) x 的数量级，成为实际应用中吸附挥发性有机化合物的有希望的候选者。