磁性三乙烯四胺氧化石墨烯对Cu2+的吸附行为

doi:10.11949/j.issn.0438-1157.20151130

化工学报 ›› 2016, Vol. 67 ›› Issue (5): 1949-1956.DOI: 10.11949/j.issn.0438-1157.20151130

磁性三乙烯四胺氧化石墨烯对Cu²⁺的吸附行为

陈芳妮, 孙晓君, 魏金枝, 刘献斌, 胡琴

哈尔滨理工大学化学与环境工程学院, 黑龙江哈尔滨 150040

收稿日期:2015-07-15 修回日期:2015-09-01 出版日期:2016-05-05 发布日期:2016-05-05
通讯作者: 孙晓君
基金资助:
国家自然科学基金项目(51208159);黑龙江省自然科学基金项目(B201204)。

Adsorption behavior of magnetic triethylene tetramine-graphene oxide nanocomposite for Cu²⁺

CHEN Fangni, SUN Xiaojun, WEI Jinzhi, LIU Xianbin, HU Qin

School of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, Heilongjiang, China

Received:2015-07-15 Revised:2015-09-01 Online:2016-05-05 Published:2016-05-05
Supported by:
supported by the National Natural Science Foundation of China (51208159) and the Nature Science Foundation of Heilongjiang Province (B201204).

摘要/Abstract

摘要：

为了提高氧化石墨烯(GO)的吸附能力和分离效果,采用恒温搅拌法和水热法制备磁性三乙烯四胺氧化石墨烯(M-T-GO)复合吸附剂。通过X射线衍射(XRD)、傅里叶红外光谱(FT-IR)和透射电镜(TEM)测试方法对其进行表征,并对M-T-GO对Cu²⁺的pH、吸附动力学、吸附等温线和吸附热力学进行研究。结果表明,M-T-GO对Cu²⁺的吸附符合二级反应动力学和Langmuir吸附等温式描述,吸附反应为自发吸热过程,饱和吸附量为245.09 mg·g^-1,同时具有快速分离和易再生的优点。采用X射线光电子能谱(XPS)推测M-T-GO对Cu²⁺的吸附机理,结果表明M-T-GO主要通过螯合作用和静电引力对Cu²⁺进行吸附。

关键词: 氧化石墨烯, 吸附, Cu²⁺, 动力学, 等温线

Abstract:

A novel composite adsorbent of magnetic triethylene tetramine graphene oxide (M-T-GO) was firstly prepared by isothermal stirring and hydrothermal method to improve adsorption ability and separation efficiency of graphene oxide (GO). M-T-GO was characterized by Fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD) and transmission electron microscope (TEM), respectively. The pH, adsorption kinetics, isotherms and thermodynamics of Cu²⁺ on M-T-GO were studied, indicating that the adsorptions kinetic was well fitted by pseudo-second-order model and the equilibrium adsorption was well described with Langmuir model. The saturated adsorption capacity of Cu²⁺ was about 245.09 mg·g^-1 on M-T-GO. M-T-GO could make separation of the adsorbents easy in the foreign magnetic field and possess good performance of regeneration. The adsorption process of Cu²⁺ was spontaneous and endothermic by the calculated thermodynamic parameters. X-ray photoelectron spectroscopy (XPS) spectra suggested that Cu²⁺ was adsorbed on M-T-GO mainly through the chelation and electrostatic attraction.

Key words: graphene oxide, adsorption, Cu²⁺, kinetics, isotherm

中图分类号:

X592

陈芳妮, 孙晓君, 魏金枝, 刘献斌, 胡琴. 磁性三乙烯四胺氧化石墨烯对Cu²⁺的吸附行为[J]. 化工学报, 2016, 67(5): 1949-1956.

CHEN Fangni, SUN Xiaojun, WEI Jinzhi, LIU Xianbin, HU Qin. Adsorption behavior of magnetic triethylene tetramine-graphene oxide nanocomposite for Cu²⁺[J]. CIESC Journal, 2016, 67(5): 1949-1956.

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磁性三乙烯四胺氧化石墨烯对Cu²⁺的吸附行为

Adsorption behavior of magnetic triethylene tetramine-graphene oxide nanocomposite for Cu²⁺

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