Preparation and adsorption study of waste tea-based porous carbon for methyl orange dyes

doi:10.19965/j.cnki.iwt.2023-0766

Abstract

Abstract:

In order to reduce the environment pollution caused by waste tea and increase its high added value. In this paper, waste tea was used as raw material and waste tea-based porous carbon was prepared by chemical activation with waste tea as raw material. The tea-based porous carbon were characterized by scanning electron microscope, X-ray diffraction and nitrogen adsorption/desorption. The adsorption performance of methyl orange (MO) in wastewater was studied and the isothermal adsorption model and kinetic model of tea-based porous carbon on MO were further analyzed. The results showed that the tea-based porous carbon had rich pore structure and the specific surface area of porous carbon HPC-NaOH reached 3 026 m²/g with a microporous surface area of 2 811 m²/g and the total pore volume of 1.54 m³/g. With the initial concentration of MO of 200 mg/L and a dosage of 1.5 g/L, the maximum adsorption capacity of porous carbon HPC-NaOH was 1 264.66 mg/g and the removal rate of MO was as high as 94.85%. the adsorption process of porous carbon HPC-NaOH for MO was conformed to Langmuir model and the pseudo-second-order kinetic equation, indicating that the adsorption process belonged to the chemical adsorption of a single molecular layer.

Key words: waste tea-based porous carbon, methyl orange, adsorption, dynamics

摘要：

为减少废弃茶叶对环境的污染以及增加其高附加值，以废弃茶叶为碳源，采用化学活化法制备出茶叶基多孔炭。利用扫描电子显微镜、X射线衍射仪和氮气等温吸附对所得多孔炭进行表征，研究了其对甲基橙（MO）废水的吸附性能并分析了多孔炭对MO的等温吸附模型和动力学模型。结果表明，制备出的茶叶基多孔炭具有丰富的孔隙结构，其中NaOH作为活化剂制备的多孔炭HPC-NaOH比表面积达到3 026 m²/g，其中微孔面积为2 811 m²/g，总孔体积为1.54 m³/g。当MO初始质量浓度为200 mg/L，HPC-NaOH投加量为1.5 g/L时，HPC-NaOH的最大吸附量为1 264.66 mg/g，MO去除率高达94.85%。多孔炭HPC-NaOH对MO的吸附过程符合Langmuir吸附等温模型和准二级动力学模型，表明吸附过程属于单分子化学吸附类型。

关键词: 茶叶基多孔炭, 甲基橙, 吸附, 动力学

CLC Number:

TQ424.1

Haoyu ZHANG, Yikang ZHOU, Yan WANG, Le PAN, Yunfei WANG, Dezhang ZHU, Yan WU. Preparation and adsorption study of waste tea-based porous carbon for methyl orange dyes[J]. Industrial Water Treatment, 2024, 44(8): 171-177.

张昊宇, 周亿康, 汪燕, 潘乐, 王云飞, 朱德璋, 吴燕. 茶叶基多孔炭的制备及对甲基橙吸附的研究[J]. 工业水处理, 2024, 44(8): 171-177.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-0766

https://www.iwt.cn/EN/Y2024/V44/I8/171

Figures/Tables 10

Fig.1 SEM images of HPC-ZnCl₂（a），HPC-K₂CO₃（b） and HPC-NaOH（c）

Fig.2 Nitrogen adsorption-desorption isotherms of porous carbon HPC-R

Table 1 The pore structure parameters of porous carbon HPC-R

样品	S _BET/（m²·g^-1）	V _t/（cm³·g^-1）	D _ave/nm	S _micro/（m²·g^-1）	S _ext/（m²·g^-1）	V _micro/（cm³·g^-1）	V _ext/（cm³·g^-1）
HPC-ZnCl₂	322	0.22	2.76	223	99	0.10	0.12
HPC-K₂CO₃	1 065	0.50	1.90	982	83	0.39	0.11
HPC-NaOH	3 026	1.54	2.04	2 811	215	1.29	0.25

Fig.3 pore size distribution of porous carbon HPC-R

Fig. 4 XRD patterns of porous carbon HPC-R

Fig.5 FITR spectras of porous carbon HPC-R

Fig.6 Adsorption capacity and removal efficiency of HPC-R

Fig.7 Effect of initial MO concentration and contact time on adsorption capacity（a） and removal efficiency（b） of MO adsorption onto HPC-NaOH

Fig.8 Isotherm model for adsorption of MO on HPC-NaOH

Fig.9 Kinetic models，pseudo-first-order kinetic model，pseudo-second-order kinetic model and intra-particle diffusion model

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