Poly(4-styrenesulfonic acid-co-maleic acid)-sodium-modified magnetic reduced graphene oxide for enhanced adsorption performance toward cationic dyes
Poly(4-styrenesulfonic acid-co-maleic acid)-sodium-modified magnetic reduced graphene oxide for enhanced adsorption performance toward cationic dyes
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DOI：
10.1039/c5ra18255g
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发表时间：
2015-10
期刊：
影响因子：
3.9
通讯作者：
Yu-Bei Song;Xiao-Dong Song;Chang-Jing Cheng;Zhi-Gang Zhao
中科院分区：
文献类型：
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作者：
Yu-Bei Song;Xiao-Dong Song;Chang-Jing Cheng;Zhi-Gang Zhao
通过结合具有丰富阴离子官能团（–COO−和–SO3−）的聚（4-苯乙烯磺酸-马来酸）钠（PSSMA）、高比表面积的氧化石墨烯（GO）和具有优异磁响应性的Fe3O4纳米颗粒的优点，通过简单易行的一步溶剂热法合成了一种新型PSSMA修饰的磁性还原氧化石墨烯纳米复合材料（PSSMA/M-rGO），并用于去除阳离子本研究中从水溶液中提取染料。通过傅里叶变换红外光谱、紫外可见光谱、扫描电子显微镜、透射电子显微镜、热重分析、X射线衍射、振动样品磁力测定、动态光散射和氮气吸附-解吸技术对合成的PSSMA/M-rGO进行了表征。使用碱性品红（BF）、结晶紫（CV）和亚甲基蓝（MB）三种典型的阳离子染料作为模型染料污染物来评估所得PSSMA/M-rGO的吸附性能。在不同的实验条件下系统地研究了三种阳离子染料在 PSSMA/M-rGO 和表面未经 PSSMA 修饰的 M-rGO 上的吸附情况。结果表明，PSSMA与M-rGO的结合可以显着增强三种染料的吸附能力和去除效率。这是由于 PSSMA/M-rGO 上丰富的 –COO− 和 –SO3− 基团与带正电的染料分子具有强静电相互作用。三种染料在两种吸附剂上的吸附动力学和等温线表明，动力学和平衡吸附可以分别用伪二级动力学和朗缪尔模型很好地描述。此外，PSSMA/M-rGO纳米复合材料还表现出对BF、CV和MB混合染料的高去除效率。这种功能性纳米复合材料具有高吸附容量、低生产成本和优异的可回收性，有望作为高效去除水溶液中阳离子有机污染物的候选吸附剂。
By combining the advantages of poly(4-styrenesulfonic acid-co-maleic acid) sodium (PSSMA) with abundant anionic functional groups (–COO− and –SO3−), graphene oxide (GO) with high specific surface area and Fe3O4 nanoparticles with excellent magnetic responsiveness, a novel type of PSSMA-modified magnetic reduced graphene oxide nanocomposite (PSSMA/M-rGO) was synthesized via a simple and facile one-step solvothermal method and used for removing cationic dyes from aqueous solutions in this study. The as-synthesized PSSMA/M-rGO was characterized by Fourier transform infrared spectroscopy, UV-vis spectroscopy, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, X-ray diffraction, vibrating sample magnetometry, dynamic light scattering and nitrogen adsorption-desorption technique. Three typical cationic dyes, basic fuchsin (BF), crystal violet (CV) and methylene blue (MB) were used as model dye pollutants to evaluate the adsorption performance of the resultant PSSMA/M-rGO. The adsorption of three cationic dyes onto both PSSMA/M-rGO and M-rGO without PSSMA modification on the surface were systematically investigated at different experiment conditions. The results indicate that the binding of PSSMA on M-rGO can significantly enhance the adsorption capacities and removal efficiencies of the three dyes. This is due to the rich –COO− and –SO3− groups on PSSMA/M-rGO having strong electrostatic interactions with the positively charged dye molecules. The adsorption kinetics and isotherms of the three dyes onto both adsorbents demonstrate that the kinetics and equilibrium adsorptions can be well-described by pseudo-second-order kinetics and Langmuir model, respectively. Moreover, the PSSMA/M-rGO nanocomposites also demonstrate high removal efficiencies toward mixed dyes of BF, CV and MB. Such functional nanocomposites with high adsorption capacity, low production cost and excellent recyclability, are promising as candidate adsorbents for highly-efficient removal of cationic organic pollutants from aqueous solutions.