复合改性膨胀石墨的制备及对酸性艳蓝染料的吸附

doi:10.7503/cjcu20150544

摘要/Abstract

摘要：

采用相同反离子协同磷酸活化法, 以十六烷基三甲基溴化铵(CTAB)-KBr为复合改性剂, 制备了一种高效吸附剂复合改性膨胀石墨(M-EG), 通过扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)及X射线电子能谱(XPS)等对膨胀石墨(EG)和改性膨胀石墨(M-EG)的形貌结构、组成和价态进行了表征, 考察了EG和M-EG对酸性艳蓝染料废水的处理效果. 结果表明, 复合改性后的膨胀石墨孔隙度变大, 表面含氮和溴官能团增多. 吸附剂M-EG对酸性艳蓝染料废水具有较高的吸附性能, 在pH=1.0及30 ℃条件下对染料的去除率达到94.13%; EG符合二级动力学吸附模型, 用Langmuir等温线方程拟合效果较好; M-EG符合二级吸附动力学方程, 同时符合Langmuir和Freundlich等温吸附模型; M-EG的吸附动力学常数大于EG吸附动力学常数.

关键词: 复合改性膨胀石墨, 酸性艳蓝, 吸附性能

Abstract:

Modified expanded graphite(M-EG) was synthesized via same counter ion coordinated phosphate(H₃PO₄) activation method, as prepared expanded graphite(EG). M-EG was investigated by scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR) and X-ray photoelectron spectroscopy(XPS). The adsorbent activities of the EG and M-EG were evaluated for the reduction of acid brilliant blue. The results indicated that the porosity of EG after composite modified expanded, the surface enlarged and the nitrogen- and bromine-containing functional groups increasing. Adsorbent M-EG in acid brilliant blue dye wastewater show high adsorbent activities with a 94.13% reduction at pH=1.0 and 30 ℃. The adsorption reaction of EG line with second-order kinetic adsorption model, and the Langmuir isotherm equation is well fitted; M-EG conform second adsorption kinetics equation, while compliance with Langmuir isotherm model and Freundlich isotherm model, what’s more adsorption kinetics constant is greater than EG’s.

Key words: Composite modified expanded graphite, Acid brilliant blue, Adsorption property

中图分类号:

O647

TrendMD:

王会丽, 赵越, 马乐宽, 范鹏浩, 徐从斌, 焦春磊, 林爱军. 复合改性膨胀石墨的制备及对酸性艳蓝染料的吸附. 高等学校化学学报, 2016, 37(2): 335.

WANG Huili, ZHAO Yue, MA Lekuan, FAN Penghao, XU Congbin, JIAO Chunlei, LIN Aijun. Preparation of Composite Modified Expanded Graphite and Its Adsorption on Acid Brilliant Blue Dye^†. Chem. J. Chinese Universities, 2016, 37(2): 335.

图/表 7

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NaCl		NaOH		Pb(NO₃)₂
Molar fraction(%)	Removal rate(%)	Molar fraction(%)	Removal rate(%)	c/(mg·L^-1)	Removal rate(%)
0	85.06	0	85.06	0	85.06
1	88.39	1	85.81	33.3	91.79
2	88.52	1.5	87.92	66.7	93.41
3	87.71	2	86.8	100	94.16
4	87.43	2.5	87.55	133.3	94.28
5	86.48	3	88.42	166.7	94.66

NaCl		NaOH		Pb(NO₃)₂
Molar fraction(%)	Removal rate(%)	Molar fraction(%)	Removal rate(%)	c/(mg·L^-1)	Removal rate(%)
0	85.06	0	85.06	0	85.06
1	88.39	1	85.81	33.3	91.79
2	88.52	1.5	87.92	66.7	93.41
3	87.71	2	86.8	100	94.16
4	87.43	2.5	87.55	133.3	94.28
5	86.48	3	88.42	166.7	94.66

Adsorbent	Pseudo-first-order			Pseudo-second order
Adsorbent	Q_e/(mg·g^-1)	k₁/h^-1	R²	Q_e/(mg·g^-1)	k₂/h^-1	R²
M-EG	67.69	0.4026	0.7049	71.43	0.3267	0.9976
EG	62.18	0.0805	0.4626	66.22	0.1086	0.983

Adsorbent	Pseudo-first-order			Pseudo-second order
Adsorbent	Q_e/(mg·g^-1)	k₁/h^-1	R²	Q_e/(mg·g^-1)	k₂/h^-1	R²
M-EG	67.69	0.4026	0.7049	71.43	0.3267	0.9976
EG	62.18	0.0805	0.4626	66.22	0.1086	0.983

Adsorbent	Langmuir parameter			Freundlich parameter
Adsorbent	Q_m/(mg·g^-1)	b/(L·mg^-1)	R²	n	K_F	R²
M-EG	526.32	0.0322	0.9785	1.9066	15.929	0.8311
EG	100.00	0.0805	0.8142	2.9011	12.627	0.7708