Preparation and Properties of Copper⁃Activated Lignin Activated Carbon

doi:10.12422/j.issn.1672-6952.2024.05.001

Abstract

Abstract:

Using sodium lignosulfonate and copper chloride dihydrate as raw materials, and activated carbon modified materials under different synthetic conditions were prepared by calcination under N₂ atmosphere by impregnation and activation. The structure and surface morphology of the prepared materials were studied by X-ray diffraction (XRD), infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and other testing methods. Taking K₂Cr₂O₇ solution with mass concentration of 20 mg/L as the research object, the Cr(Ⅵ) content in the solution was detected by Diphenyl carbamide chromogenic method, and the adsorption capacity of the prepared activated carbon modified materials was calculated. According to the experimental results, when the proportion of copper is 20% and the calcination temperature is 700 ℃, the adsorption performance of the material is the best, and the adsorption capacity is 72.2 mg/g. The adsorption process conforms to the Langmuir monolayer adsorption and Pseudo-second-order kinetics.

Key words: Calcination method, Lignin, Chromium ions, Adsorb

摘要：

以木质素磺酸钠和二水合氯化铜为原料，在N₂氛围及不同的合成条件下，采用浸渍活化法煅烧制备了活性炭改性材料；通过X射线衍射（XRD）、红外光谱（FT-IR）、X-射线光电子能谱（XPS）等测试手段研究了所制备样品的结构和表面形貌；以质量浓度为20 mg/L的K₂Cr₂O₇溶液为研究对象，通过二苯碳酰二肼显色法，检测溶液中的Cr（Ⅵ）质量浓度并计算了所制备的活性炭改性材料的吸附容量。结果表明，当Cu质量分数为20%、煅烧温度为700 ℃时，样品的吸附性能最好，吸附容量为72.2 mg/g；吸附过程符合Langmuir单层吸附和准二级动力学。

关键词: 煅烧法, 木质素, Cr离子, 吸附

CLC Number:

TQ134.1

Yaru QIU, Kun LAN, Changdong CHEN, Fangfang WANG, Caiyun LU. Preparation and Properties of Copper⁃Activated Lignin Activated Carbon[J]. Journal of Liaoning Petrochemical University, 2024, 44(5): 1-7.

邱亚茹, 兰鲲, 陈常东, 王芳芳, 陆彩云. 铜活化木质素活性炭的制备与性能[J]. 辽宁石油化工大学学报, 2024, 44(5): 1-7.

Figures/Tables 8

Fig.1 XRD patterns of calcination Cu?AC with different temperature

Fig.2 FT?IR spectrum of Cu?AC700 sample before and after adsorbent process

Fig.3 XPS spectrum of Cu?AC700 sample before and after adsorbent process

Fig.4 Influence relation of preparation conditions and adsorption capacity

Fig.5 Langmuir and Freundlich isothermal adsorption curves of Cu?AC700 sample at 293 K

Table 1 Isothermal adsorption data of Cu?AC700 sample

温度/K	Freundlich等温吸附模型			Langmuir等温吸附模型
温度/K	K_F	1/n	R²	Q_m/(mg•g^-1)	K_L	R²
293	55	0.11	0.676	69.4	0.208	0.999

Fig.6 Adsorption kinetics and adsorption capacity curve of Cu?AC700 with various Cr(Ⅵ) concentration

Table 2 Adsorption kinetics data of Cu?AC700 sample

Cr(Ⅵ) 质量浓度/（mg•L^-1）	准一级动力学			准二级动力学
Cr(Ⅵ) 质量浓度/（mg•L^-1）	Q_e/(mg•g^-1)	K₁×10³/min^-1	R²	Q_e/(mg•g^-1)	K₂/[g•(mg•min)^-1]	R²
10	46.2	2.15	0.935	47.2	0.020 0	0.999
20	71.3	1.79	0.966	72.5	0.013 5	0.999
30	70.6	2.14	0.985	71.9	0.013 6	0.999
50	69.7	1.94	0.980	70.8	0.013 7	0.998

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