同步活化磁化制备磁性多孔炭去除水中孔雀石绿

doi:10.19965/j.cnki.iwt.2021-0217

摘要/Abstract

摘要：

通过ZnCl₂和FeCl₃的同步活化磁化法，制备出了既有磁分离能力又有较强吸附能力的磁性多孔炭材料。结果表明：ZnCl₂和FeCl₃起到了较好的活化作用，随着活化剂用量的增加，孔隙率和比表面积迅速增大，孔填充效果增强。磁性多孔炭比表面积最高为2 302 m²/g，孔容最高为1.176 cm³/g，同时在表面络合和π-π键相互作用下，吸附性能也明显提高。磁性多孔炭对孔雀石绿有着较好的吸附效果，最大吸附量为1 004.3 mg/g。饱和磁化强度为7.99 emu/g，磁性质足以使其在外加磁场的作用下和溶液分离。

关键词: 磁性多孔炭, 同步活化磁化, 孔雀石绿, 吸附

Abstract:

By the synchronous activation magnetization method of adding ZnCl₂ and FeCl₃, the magnetic porous carbon materials with both magnetic separation ability and strong adsorption ability were prepared. Results showed that the ZnCl₂ and FeCl₃ played a great role of activation in porous carbon. With the increase of the dosage of activator ZnCl₂ and FeCl₃, porosity and surface area increased rapidly, and the hole filling was enhanced. Magnetic porous carbon surface area was up to 2 302 m²/g and pore volume of 1.176 cm³/g. At the same time, the surface complexation and π-π bond interaction also significantly improve the adsorption. It has good adsorption effect on malachite green, with the highest adsorption capacity of 1 004.3 mg/g. The measured saturation magnetization is 7.99 emu/g, and the magnetic components was sufficient to be separated from the solution under the action of external magnetic field.

Key words: magnetic porous carbon, synchronous activation and magnetization, malachite green, adsorption

中图分类号:

TQ424.1
X703

苏石川,林立涛,王亮. 同步活化磁化制备磁性多孔炭去除水中孔雀石绿[J]. 工业水处理, 2021, 41(11): 65-69.

Shichuan SU,Litao LIN,Liang WANG. Magnetic porous carbon prepared by synchronous activation magnetization to remove malachite green from water[J]. Industrial Water Treatment, 2021, 41(11): 65-69.

https://www.iwt.cn/CN/Y2021/V41/I11/65

图/表 5

图1 不同FeCl₃加入量的磁性多孔炭样品的氮气吸附脱附等温线和孔径分布

Fig.1 N₂ adsorption-desorption curves and pore-size distribution curves of magnetic activated carbon(various FeCl₃ dosage)

表1 磁性多孔炭的基本理化性质

Table 1 Basic parameters for the magnetic porous carbon composites

样品	C质量分数/%	H质量分数/%	N质量分数/%	比表面积/（m²·g^-1）^a	微孔比表面积/（m²·g^-1）^b	微孔率/%	孔容/（cm³·g^-1）
MC-0-Fe	74.5	1.64	0.34	1 389	1 024	73.8	0.768
MC-0.01-Fe	84.4	1.69	0.43	1 614	1 209	74.9	0.854
MC-0.02-Fe	83.4	1.51	0.38	1 885	1 385	73.5	1.032
MC-0.04-Fe	75.8	1.38	0.36	1 797	1 330	74.0	1.009
MC-0-Zn	62.3	1.73	0.11	458.3	182.6	39.8	0.358
MC-1/2-Zn	78.6	2.00	0.28	1 435	1 086	75.7	0.794
MC-1/1-Zn	84.1	1.51	0.52	2 302	1 834	79.7	1.176
MC-2/1-Zn	78.9	1.31	0.54	2 024	118.2	5.83	1.314

图2 不同ZnCl₂含量的磁性多孔炭样品的氮气吸附脱附等温线和孔径分布

Fig.2 N₂ adsorption-desorption curves and pore-size distribu-tion curves of magnetic activated carbon(various ZnCl₂ content)

图3 磁性多孔炭样品对孔雀石绿的吸附等温线和吸附动力学

Fig.3 Adsorption isotherms and adsorption kinetics of MG for magnetic activated carbon

表2 Langmuir吸附等温线拟合参数

Table 2 Langmuir isotherm parameters for the adsorption of MG onto selected samples

样品	q_m/（mg·g^-1）	比表面积/（m²·g^-1）	微孔率/%
MC-0-Zn	119.9	458	39.8
MC-1/2-Zn	764.7	1 435	75.7
MC-1/1-Zn	1 004.3	2 302	79.7
MC-0.04-Fe	403.2	1 797	74.0

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