Synergistically constructed polyamine/nanosilica/graphene composites: preparation, features and removal of Hg2+ and dyes from contaminated water
Synergistically constructed polyamine/nanosilica/graphene composites: preparation, features and removal of Hg2+ and dyes from contaminated water
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DOI：
10.1039/c3ra46733c
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发表时间：
2014-02
期刊：
影响因子：
3.9
通讯作者：
Xinling Liu;Yanfeng Gao;Hongjie Luo;R. Jin
中科院分区：
文献类型：
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作者：
Xinling Liu;Yanfeng Gao;Hongjie Luo;R. Jin
开发了一种简单的方法来构建石墨烯-纳米二氧化硅复合材料。聚乙烯亚胺（PEI）是功能上类似于生物体中的生物多胺的合成多胺，其用作模板/支架/催化剂以指导纳米结构化二氧化硅形成，即，PEI杂化二氧化硅（PEI@SiO2）。由于PEI的阳离子性质和还原性，混合PEI@SiO2表面在室温下立即吸附带负电荷的氧化石墨烯（GO），导致PEI@SiO2@GO复合材料。在90 °C下将GO进一步原位还原成还原的氧化石墨烯（rGO）以形成PEI@SiO2@rGO。PEI@SiO2@GO对Hg 2+的去除率高达96%; PEI@SiO2@rGO对有机染料的脱色性能（罗丹明B或甲基蓝）。与先前公开的制备石墨烯-无机复合材料的方法不同，该方法对其它聚胺-二氧化硅具有通用性在一些实施方案中，所述催化剂与氧化物（或金属氧化物）体系反应，并且具有靶向GO的协同效率，而无需额外的表面改性和还原剂。
A simple method was developed to construct graphene–nanosilica composites. Polyethyleneimine (PEI), which is a synthetic polyamine functionally analogous to bio-polyamines in organisms, was used as a template/scaffold/catalyst to direct nanostructured silica formation, i.e., PEI hybridised silica (PEI@SiO2). Due to the cationic nature and reducibility of PEI, the hybrid PEI@SiO2 surface instantly adsorbs the negatively charged graphene oxide (GO) at room temperature, leading to PEI@SiO2@GO composites. The GO was further reduced in situ into reduced grapheme oxide (rGO) to form PEI@SiO2@rGO at 90 °C. The PEI@SiO2@GO showed a high removal efficiency of 96% for Hg2+ from a 10 ppm solution; PEI@SiO2@rGO could decolorise organic dyes (rhodamine B or methyl blue) from solution after 30 min. Unlike previously published methods for producing graphene–inorganic composites, this method is general to other polyamine–silica (or metal oxide) systems and has the synergistic efficiency to target GO without additional surface modification and reductants.