Graphene-coated silica as a highly efficient sorbent for residual organophosphorus pesticides in water
Graphene-coated silica as a highly efficient sorbent for residual organophosphorus pesticides in water
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DOI：
10.1039/c2ta00173j
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Liu, Yunqi
中科院分区：
文献类型：
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作者：
Liu, Xiaotong;Zhang, Hongyan;Liu, Yunqi
通过将剥离的氧化石墨烯与酸处理的二氧化硅混合并用水合肼还原它以使其包覆二氧化硅颗粒，制备了一种新形式的石墨烯包覆二氧化硅（GCS）。该方法简单、方便、耐用。采用光学照片、拉曼光谱、傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、热重分析（TGA）、比表面积（BET）分析和元素分析对GCS复合粒子进行了表征。这些分析表明，该反应有效地用石墨烯包覆二氧化硅颗粒。复合颗粒实现了更高水平的吸附，并且比其他五种吸附剂（石墨碳，活性炭，纯石墨烯，C18二氧化硅和二氧化硅）更广泛地适用于测定的11种农药。我们讨论了吸附机制，并认为它是依赖于S，P和N原子的供电子能力和苯环的强π键网络。这项研究表明，石墨烯基复合材料可用于去除水环境中的农药残留。
A new form of graphene-coated silica (GCS) has been prepared by mixing exfoliated graphene oxide with acid-treated silica and reducing it with hydrazine hydrate so that it coats the silica particles. This method is simple, convenient, and robust. The GCS composite particles have been characterized using optical photographs, Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Brunauer-Emmett-Teller (BET) analysis, and elemental analysis. These analyses show that the reaction effectively coats silica particles with graphene. The composite particles achieve higher levels of adsorption and are more widely applicable than five other sorbents (graphite carbons, activated carbon, pure graphene, C18 silica, and silica) for the eleven pesticides assayed. We discuss the adsorption mechanism and consider it to be dependent on the electron-donating abilities of the S, P, and N atoms and the strong pi-bonding network of the benzene rings. This research demonstrates that graphene-based composite materials could be used to remove pesticide residues in aqueous environments.