Background

Ammonium chloride as an explosive salt has proved to be a prominent activation agent for adsorbents and increase the specific surface area and volume of cavities. In this work, the ability of this substance was scrutinized for activation of carbon aerogel to prepare an efficient adsorbent for benzene removal from air streams.

Methods

A carbon xerogel was fabricated from Novallac polymer and activated by ammonium chloride.The changes in structure and morphology were considered via Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Barrett-Joyner-Halenda (BJH), and energy dispersive X-ray (EDX) analyses. Also, comprehensive studies were conducted to vouchsafe the properties of the new adsorbent for benzene removal, using a fixed-bed column mode.

Results

The results showed both the successful synthesis and the suitability of the activation process. ACX possessed a higher specific surface area (1008 g/m³), compared to the parent carbon xerogel (CX; 543.7 g/m³) and organic xerogel (OX; 47 g/m³), as well as a higher adsorption capacity.

Conclusion

NH₄CL is a very beneficial for modifying the structure and morphology of carbon aerogel, and the dynamic behavior of the column with respect inlet benzene concentration can be explained by Yan-Nelson model.

中文翻译：

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使用 NH 4 Cl 活化碳干凝胶制备一种新型有效吸附剂，用于在固定床柱中从污染空气流中去除苯

背景

氯化铵作为一种爆炸性盐已被证明是一种重要的吸附剂活化剂，可增加空腔的比表面积和体积。在这项工作中，仔细研究了这种物质的能力，用于活化碳气凝胶，以制备用于从空气流中去除苯的有效吸附剂。

方法

碳干凝胶由 Novallac 聚合物制成并由氯化铵活化。结构和形态的变化通过 Brunauer-Emmett-Teller (BET)、扫描电子显微镜 (SEM)、傅里叶变换红外 (FTIR)、Barrett-Joyner- Halenda (BJH) 和能量色散 X 射线 (EDX) 分析。此外，使用固定床柱模式进行了综合研究，以保证新吸附剂的苯去除性能。

结果

结果表明成功合成和活化过程的适用性。与母体碳干凝胶（CX；543.7 g/m ³）和有机干凝胶（OX；47 g/m ³ ）相比， ACX具有更高的比表面积（1008 g/m ³ ） ，以及更高的吸附容量.

结论

NH ₄ CL 对修饰碳气凝胶的结构和形貌非常有利，而色谱柱相对于入口苯浓度的动态行为可以用 Yan-Nelson 模型来解释。