Liou Tzong-Horng, Liou Yuan Hao
Department of Chemical Engineering, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan, New Taipei 24301, Taiwan.
Battery Research Center of Green Energy, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan, New Taipei 24301, Taiwan.
Materials (Basel). 2021 Mar 4;14(5):1214. doi: 10.3390/ma14051214.
Rice husk is an agricultural biomass waste. Burning rice husks in an oxygenic atmosphere releases thermal energy and produces ash that is rich in silica. Rice husk ash (RHA) can be used as a sustainable source of silica for producing high-value-added products. In this study, mesostructural graphene oxide (GO)/SBA-15, a graphene-based hybrid material, was synthesized from RHA. The materials are inspected by Fourier transform infrared spectrometer, Raman spectrometer, field-emission scanning electron microscopy, transmission electron microscopy, surface area analyzer, and X-ray diffraction analyzer. Studies have revealed that GO/SBA-15 possesses various oxygen functional groups that are helpful for dye adsorption. The material consisted of high pore volume of 0.901 cm/g, wide pores of diameter 11.67 nm, and high surface area of 499 m/g. Analysis of the methylene blue (MB) adsorption behavior of GO/SBA-15 composites revealed that their adsorption capacity depended on the gelation pH, GO content, adsorbent dosage, and initial dye (MB) concentration. The highest adsorption capacity of GO/SBA-15 was 632.9 mg/g. Furthermore, the adsorption isotherms and kinetics of GO/SBA-15 were investigated. This study demonstrated the great advantage of treated RHA and the potential of this material for use in organic dye adsorption.
稻壳是一种农业生物质废弃物。在有氧气氛中燃烧稻壳会释放热能并产生富含二氧化硅的灰烬。稻壳灰（RHA）可作为生产高附加值产品的可持续二氧化硅来源。在本研究中，由稻壳灰合成了介观结构的氧化石墨烯（GO）/SBA-15，一种基于石墨烯的复合材料。通过傅里叶变换红外光谱仪、拉曼光谱仪、场发射扫描电子显微镜、透射电子显微镜、表面积分析仪和X射线衍射分析仪对材料进行了检测。研究表明，GO/SBA-15具有多种有助于染料吸附的氧官能团。该材料具有0.901 cm/g的高孔容、11.67 nm的宽孔径和499 m/g的高比表面积。对GO/SBA-15复合材料的亚甲基蓝（MB）吸附行为分析表明，其吸附容量取决于凝胶化pH值、GO含量、吸附剂用量和初始染料（MB）浓度。GO/SBA-15的最高吸附容量为632.9 mg/g。此外，还研究了GO/SBA-15的吸附等温线和动力学。本研究证明了处理后的稻壳灰的巨大优势以及该材料在有机染料吸附方面的应用潜力。
