石墨烯/SiO@聚吡咯纳米复合材料的合成及其在水溶液中 Cr(VI)去除的应用。
Synthesis of graphene/SiO@polypyrrole nanocomposites and their application for Cr(VI) removal in aqueous solution.
机构信息
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
出版信息
Chemosphere. 2018 Apr;197:594-602. doi: 10.1016/j.chemosphere.2017.12.163. Epub 2018 Jan 10.
A novel hybrid nanocomposite, polypyrrole nanoparticles (PPy) anchored on the graphene/silica nanosheets with the high specific surface area (polypyrrole-graphene/silica, GS-PPy), was synthesized by a facile in situ polymerization and shows great potential to remove hexavalent chromium [Cr(VI)] in aqueous solutions. Characterizations by XRD, TEM, SEM, BET, FT-IR and XPS, have confirmed that the PPy nanoparticles were well-distributed on the surface of GS nanosheets. The effects of pH, contact time, the concentration of Cr(VI), temperature, coexisting ions and the number of adsorption-desorption cycles were studied. The maximum adsorption capacity of the GS-PPy for Cr(VI) was 429.2 mg g at 298 K at pH 2, which was much higher than PPy nanoparticles and other related materials. The adsorption data fitted to the pseudo-second-order model and Langmuir isotherm model. The removal mechanism involved in electrostatic attraction, ion exchange and reduction process that partial adsorbed Cr(VI) was reduced to Cr(III). And Cr(III) was still retained on the surface of GS-PPy. The GS-PPy nanocomposite will be a potential candidate for the removal of Cr(VI) from the industrial waste water.
一种新型的杂化纳米复合材料，即具有高比表面积的聚苯胺纳米粒子（PPy）锚定在石墨烯/二氧化硅纳米片上（PPy-石墨烯/二氧化硅，GS-PPy），通过简便的原位聚合合成，具有去除水溶液中六价铬[Cr（VI）]的巨大潜力。通过 XRD、TEM、SEM、BET、FT-IR 和 XPS 的表征，已经证实 PPy 纳米粒子均匀分布在 GS 纳米片的表面上。研究了 pH 值、接触时间、Cr（VI）浓度、温度、共存离子和吸附-解吸循环次数的影响。在 298 K pH 2 时，GS-PPy 对 Cr（VI）的最大吸附容量为 429.2mg/g，远高于 PPy 纳米粒子和其他相关材料。吸附数据符合准二级动力学模型和 Langmuir 等温线模型。去除机制涉及静电吸引、离子交换和还原过程，部分吸附的 Cr（VI）被还原为 Cr（III）。并且 Cr（III）仍然保留在 GS-PPy 的表面上。GS-PPy 纳米复合材料将是一种从工业废水中去除 Cr（VI）的潜在候选材料。
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