Silva M R, Lecus A, Gajdardziska-Josifovska M, Schofield M, Virnoche M, Chang J, Chen J, Garman D
Water Technology Accelerator (WaTA), University of Wisconsin-Milwaukee 247 W. Freshwater Way Milwaukee Wisconsin 53204 USA
Department of Physics, University of Wisconsin-Milwaukee Mitchell Hall 251 Wisconsin 53201 USA.
RSC Adv. 2020 Jan 28;10(8):4589-4597. doi: 10.1039/c9ra00572b. eCollection 2020 Jan 24.
Multiple methods of grafting graphene oxide (GO) nanosheets to natural clinoptilolite-rich zeolite particles were developed in our laboratory. In this study, we have systematically characterized the GO coated particles prepared by various methods to select the most promising method for further research efforts. This study revealed that the most promising coating method was the clean-acid-treated zeolite particles followed by deposition of GO nanosheets onto the zeolite surface and mild thermal treatment of the particles. GO and its synergistic interaction in zeolite was attributed to electrostatic interactions, hydrophobic interactions and hydrogen bonds. Hydrophobic interactions are enhanced both due to dealumination of zeolite caused by the cleaning method followed by acid treatment and due to partial thermal deoxygenation of GO. This method provided a ten times larger surface area (from 10.55 m g to 117.96 m g) and three times smaller pore diameter (from 81.91 Å to 30.68 Å), providing great particles for a variety of applications as adsorbents or catalysts.
我们实验室开发了多种将氧化石墨烯（GO）纳米片嫁接到富含天然斜发沸石的颗粒上的方法。在本研究中，我们系统地表征了通过各种方法制备的GO包覆颗粒，以选择最有前景的方法用于进一步的研究工作。该研究表明，最有前景的包覆方法是对沸石颗粒进行酸洗处理，然后将GO纳米片沉积到沸石表面，并对颗粒进行温和的热处理。GO及其在沸石中的协同相互作用归因于静电相互作用、疏水相互作用和氢键。由于清洗方法后进行酸处理导致沸石脱铝以及GO的部分热脱氧，疏水相互作用增强。该方法提供了十倍大的表面积（从10.55 m²/g增加到117.96 m²/g）和三倍小的孔径（从81.91 Å减小到30.68 Å），为作为吸附剂或催化剂的各种应用提供了优异的颗粒。
