Sulfonated graphene oxide as an adsorbent for removal of Pb2+ and methylene blue.
Sulfonated graphene oxide as an adsorbent for removal of Pb2+ and methylene blue.
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DOI：
10.1016/j.jcis.2018.03.094
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发表时间：
2018-08
影响因子：
9.9
通讯作者：
Mao-ping Wei;Hui Chai;Ya-Li Cao;Dianzeng Jia
中科院分区：
文献类型：
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作者：
Mao-ping Wei;Hui Chai;Ya-Li Cao;Dianzeng Jia
在一些常规的纳米结构吸附剂如氧化石墨烯（GO）和石墨烯中遇到的主要挑战之一是结构限制，包括严重的聚集和在水中的亲水表面。对氨基苯磺酸功能化的氧化石墨烯（SGO）可以强烈地吸引带正电荷的污染物。因此，SGO作为吸附剂去除水溶液中的染料和有毒金属离子进行了深入的研究。同时，将还原的磺化氧化石墨烯（rSGO）、还原的氧化石墨烯（rGO）和氧化石墨烯（GO）作为比较样品。结果表明，SGO对亚甲基蓝的最大吸附容量为2530 mg/g，对Pb 2+的最大吸附容量为415 mg/g，远高于文献报道的对比样品和吸附剂。系统研究了SGO的饱和吸附量、吸附等温线和吸附动力学过程。SGO对金属离子和染料表现出较高的吸附效率和上级吸附能力，这主要归因于SGO良好的亲水性和多吸附位性。这些结果不仅为石墨烯材料提供了有效的吸附重金属离子和有机染料的方法，而且为深入了解石墨烯材料的吸附机理提供了新的思路。
One of the major challenges encountered in some conventional nano-structured adsorbents such as graphene oxide (GO) and graphene is the structural limits including serious aggregation and hydrophilic surface in water. And the sulfanilic acid functionalized graphene oxide (SGO) can powerfully attract positively charged pollutants. Therefore, the SGO served as an adsorbent to remove dyes and toxic metal ions from aqueous solution were intensively investigated. At the same time the reduced sulfonated graphene oxide (rSGO), reduced graphene oxide (rGO), and graphene oxide (GO) were performed as the comparative samples. The results showed that the maximum adsorption capacities of SGO were 2530 mg/g for methylene blue and 415 mg/g for Pb2+, which was much higher than that of the contrast samples and adsorbents reported in literatures. The adsorption of SGO was investigated systematically including the saturated adsorption capacities, isotherm, and kinetic adsorption process. The SGO displayed high adsorption efficiency and superior adsorption capacity toward metal ions and dyes, which is mainly attribute to the good dispersibility and the multiple adsorption sites of SGO. These results are promising not only providing effective adsorbing heavy metal ions and organic dyes, but also gaining insights into adsorption mechanism of graphene materials.