羧基化石墨烯对4种离子型染料的吸附脱色

doi:10.3724/SP.J.1095.2013.30021

摘要/Abstract

摘要： 合成的羧基化石墨烯（G-COOH）用FT-IR进行表征，并对G-COOH用于水溶液中甲基紫、中性红、灿烂黄和茜素红4种离子型染料的吸附性能进行了研究。考察了吸附剂用量、吸附时间、初始浓度以及溶液pH值等条件对吸附效果的影响。同时，研究了甲基紫染料的脱附性能，结果表明，用NaOH/EtOH混合溶液洗脱甲基紫，洗脱率可达88.2%，洗脱后的G-COOH可再利用。从热力学角度探讨得出，G-COOH对阳离子染料甲基紫和中性红的吸附行为能够较好的符合Langmuir等温吸附模型，而对阴离子染料灿烂黄和茜素红的吸附行为则能够较好的符合Freundlich等温吸附模型，计算的吸附参数表明，G-COOH对4种染料的吸附过程容易进行。动力学研究表明，G-COOH对4种离子型染料的吸附行为均能较好的符合准二级吸附模型。该实验研究表明，在处理染料废水时，G-COOH为相当优异的吸附剂。

关键词: 羧基化石墨烯, 离子型染料, 吸附, 脱附, 热力学, 动力学

Abstract: The structure and characteristics of synthetic G-COOH were studied using the FTIR technique. The adsorption of four ionic dyes, methyl violet, neutral red, brilliant yellow and alizarin red, onto G-COOH in aqueous solution was studied in a batch system with respect to adsorbent dose, contact time, initial dye concentration and solution pH. Also, the desorption properties of methyl violet dye was investigated. The desorption data show that the removal percent of dye methyl violet from G-COOH is 88.2% by using NaOH/EtOH eluting reagent, and the desorbed G-COOH can be reused to adsorb the dye. The Langmuir and Freundlich adsorption models have been applied to describe the equilibrium isotherms and the isotherm constants are determined. The Langmuir model agrees very well with the experimental data of cation dyes(methyl violet and neutral red), while the adsorption behavior of anion dyes(brilliant yellow and alizarin red) are fitted to Freundlich isotherms. The calculated absorption parameters indicate that absorption process of dyes on G-COOH is easy to take place. Batch kinetic data from experimental investigations on the removal of four ionic dyes from aqueous solutions fit well with the pseudo-secondorder kinetic model. The results in this study indicate that G-COOH is an attractive candidate for removing dyes from dye wastewater.

Key words: carboxylated graphene, ionic dyes, adsorption, desorption, thermodynamics, kinetic

中图分类号:

O647.3

吕莎莎, 危晶, 江峰, 王邃. 羧基化石墨烯对4种离子型染料的吸附脱色[J]. 应用化学, DOI: 10.3724/SP.J.1095.2013.30021.

LV Shasha, WEI Jing, JIANG Feng, WANG Sui*. Adsorption-decolorization of Four Ionic Dyes by Carboxylated Graphene[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2013.30021.

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