吲哚基掺氮分级多孔炭的制备及其对酸性橙<strong>74</strong>的吸附性能

doi:10.11901/1005.3093.2020.427

材料研究学报

2021, Vol. 35

Issue (9): 667-674 DOI: 10.11901/1005.3093.2020.427

研究论文

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吲哚基掺氮分级多孔炭的制备及其对酸性橙74的吸附性能

余谟鑫¹^,²(

), 蒯乐¹, 王亮¹, 张晨¹, 王晓婷¹^,³, 陈启厚¹

^1.安徽工业大学化学与化工学院马鞍山 243000
^2.中钢天源有限公司马鞍山 243000
^3.马钢集团股份有限公司马鞍山 243000

Synthesis of N-Doped Hierarchical Porous Carbon and its Adsorption Capacity for Acid Orange 74

YU Moxin¹^,²(

), KUAI Le¹, WANG Liang¹, ZHANG Chen¹, WANG Xiaoting¹^,³, CHEN Qihou¹

^1.School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan 234000, China
^2.Sinosteel New Materials Co. Ltd. , Ma'anshan 234000, China
^3.Magang (Group) Holding Co. Ltd. , Ma'anshan 234000, China

引用本文:

余谟鑫, 蒯乐, 王亮, 张晨, 王晓婷, 陈启厚. 吲哚基掺氮分级多孔炭的制备及其对酸性橙74的吸附性能[J]. 材料研究学报, 2021, 35(9): 667-674.
Moxin YU, Le KUAI, Liang WANG, Chen ZHANG, Xiaoting WANG, Qihou CHEN. Synthesis of N-Doped Hierarchical Porous Carbon and its Adsorption Capacity for Acid Orange 74[J]. Chinese Journal of Materials Research, 2021, 35(9): 667-674.

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摘要:

以吲哚为碳源、氧化钙为模板耦合KOH活化并调节活化终温，制备出表面掺氮的层状分级多孔炭(HPC_T)，研究了其对酸性橙74的吸附性能。结果表明：随着活化温度的提高这种多孔炭的比表面积增大，活化终温为900℃时制得的HPC₉₀₀比表面积高达1629 m²/g。这种炭材料具有相互连接的层状结构，且随着活化温度的提高炭壁层变薄。这种炭材料的表面有丰富的含氮官能团C-NH₂，随着活化温度的提高C-NH₂的含量随之提高。C-NH₂官能团与酸性橙74发生π-π堆积效应或静电相互作用，有利于提高其吸附性能。Freundlich模型能很好地描述HPC_T对染料的吸附过程，在50 mg/L的平衡浓度下HPC₉₀₀对废水中酸性橙74的吸附量超过270 mg/g；拟一级动力学方程能更好的描述HPC_T对酸性橙74的吸附过程，物理吸附为控速步骤。

关键词 ：无机非金属材料, 吲哚, 掺氮多孔炭, 酸性橙74, 吸附

Abstract：

N-doped hierarchical porous carbon (HPC_T) was synthesized by adjusting the final activation temperature, with indole as carbon and nitrogen source, CaO as template coupled with KOH activation, and then the adsorption performance of acid orange 74 on HPC_T was investigated. BET results show that the surface area of HPC_T increases with the increase of activation temperature. The specific surface area of the as-made HPC₉₀₀ is up to 1629 m²/g when the final activation temperature was 900℃. The FESEM and TEM results demonstrate that the HPC_T has the interconnected layer structure. With the rising activation temperature the wall width of HPC_T becomes thinner. XPS results show that nitrogen functional groups existed on the HPC_Tsurface, the content of C-NH₂ increases gradually as temperature rose. The above functional group is conducive to the π-π stacking effect and electrostatic interaction with absorbate acid orange 74, which is beneficial to the adsorption process. The adsorption isotherm results indicate that the adsorption process could be described by Freundlich model, the equilibrium adsorption capacity of which was more than 270 mg/g by the equilibrium concentration of 50 mg/L. The kinetic results show that the pseudo first-order kinetic equation can better describe the adsorption process, while the physical adsorption is the rate-control step.

Key words： inorganic non-metallic materials indole N-doped porous carbon acid orange 74 adsorption

收稿日期: 2020-10-15

ZTFLH:

O647.3

基金资助:国家自然科学基金(51602004);中国博士后基金(2019M652173)

作者简介: 余谟鑫，男，1978年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.427 或 https://www.cjmr.org/CN/Y2021/V35/I9/667

图1 吸附剂酸性橙74的化学结构式

图2 HPC900的扫描电镜照片、HPC800、HPC850和HPC900的透射电镜照片

图3 HPCT的氮气吸脱附曲线和孔径分布图

表1 HPCT样品的比表面积及孔结构参数

图4 HPCT的XPS全谱图、HPC900的O 1s图和HPC900的N 1s图

表2 制备分级多孔炭中元素及官能团含量

图5 HPCT吸附酸性橙74的吸附等温线、Langmuir拟合和Freundich拟合

表3 HPCT的等温线拟合参数

图6 HPCT吸附酸性橙74的吸附量随时间变化曲线与吸附动力学拟合曲线

表4 HPCT的动力学拟合参数

表5 不同吸附剂对酸性橙74染料的吸附

图7 HPCT对酸性橙74的吸附机理

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