化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (7) : 193-198. DOI: 10.19817/j.cnki.issn1006-3536.2022.07.040

科学研究

石墨烯对苯酚的吸附性能及机理研究

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作者信息 +

Study on adsorption property and mechanism of phenol by graphene

He Pei¹, Yang Wenjuan^1,2, Yang Chen¹, Liu Zhihua¹, Wang Yaming², Li Zhenjie¹, Jiang Lihong²

Author information +

文章历史 +

Received		Published
2021-03-23		2022-07-20
Issue Date	Revised Date
2022-08-09	2021-03-23

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摘要

以NaBH₄为还原剂,经过氧化还原制备石墨烯,使用红外光谱、X射线衍射、扫描电镜、BET等手段对其进行表征,并用于吸附水溶液中的苯酚。结果表明:石墨烯为无定形结构,比表面积292.7m²/g,孔容0.471cm³/g。常温下,石墨烯对苯酚的吸附性能与其比表面积呈正相关,最大吸附量达到81.63mg/g,且工艺稳定。石墨烯对苯酚的吸附平衡符合Freundlich模型,且吸附量随着吸附温度的增加而逐渐降低,石墨烯对苯酚的吸附过程为拟二级吸附过程,内扩散不是唯一控制吸附速率的过程且边界层效应对吸附过程有较大的影响。

Abstract

Graphene was synthesized using NaBH₄ as the reducing agent,characterized by FT-IR,XRD,SEM and N₂-sorption,and used for the adsorption of phenol in aqueous solution.The result suggested that the product was amorphous with the BET specific surface area of 292.7m²/g and pore volume of 0.471cm³/g.At room temperature,the adsorption performance of graphene on phenol was positively correlated to its specific surface area.The maximum adsorption capacity reached 81.63mg/g and the process was stable.The results of adsorption equilibrium indicated that the adsorption character of phenol on graphene obeyed the Freundlich model,and the adsorption capacity decreased as the adsorption temperature increased.The results of adsorption kinetics indicated that the adsorption character of phenol on graphene obeyed the pseudo-second-order kinetic model.In addition,the internal diffusion was not the only rate control step,and the boundary layer effect exhibited great impact on the adsorption process.

关键词

石墨烯 / 苯酚 / 吸附动力学 / 吸附平衡

Key words

graphene / phenol / adsorption kinetics / adsorption equilibrium

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石墨烯对苯酚的吸附性能及机理研究[J]. 化工新型材料, 2022, 50(7): 193-198 DOI:10.19817/j.cnki.issn1006-3536.2022.07.040

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