从玉米秸秆和砂岩中合成高纳米孔β-碳化硅,ACS Sustainable Chemistry & Engineering

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从玉米秸秆和砂岩中合成高纳米孔β-碳化硅
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-09-08 , DOI: 10.1021/acssuschemeng.0c04702
Tongtong Wang ₁ , Weibo Gong ₁ , Xin He ₁ , Zuhao Kou ₁ , Gang Tan ₂ , Shaojun Zhou ₃ , Hongtao Yu ₄ , Maohong Fan _{1,

5,

6} , Harold H. Kung ₇

Affiliation

β-碳化硅（β-SiC）多孔陶瓷由于其优越的性能（例如高表面积，出色的化学和机械稳定性以及高抗氧化和抗腐蚀性能）而成为重要的陶瓷材料。在这项研究中，廉价和容易获得的玉米秸秆和砂岩分别用作碳和硅的来源，并且以高产率有效地合成了多孔β-SiC。用XRD，拉曼，SEM，TEM和TGA对合成的β-SiC进行了表征，并利用集成的熔炉-MS系统对气态产物进行了分析。结果表明，所产生的β-SiC表现出纳米结构，其遵循源自玉米秸秆热解的石墨碳模板。表面积高达397 m ² / g，孔体积为0.4 cm ³/ g，以及3–6 nm的大多数孔径。在汽化的SiO和石墨之间的反应过程中释放出CO和CO ₂。还研究了温度在1000至1700°C范围内的影响，结果表明工艺温度与β-SiC的产率和密度之间存在强烈的依赖性。同时，提出了合成β-SiC的可能机理，并得到了实验结果的证实。这项研究提供了一种简单且环保的碳热还原方法，可利用农业废料和砂岩生产纳米多孔的β-SiC，这可能有助于建立美国的绿色经济。

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Synthesis of Highly Nanoporous β-Silicon Carbide from Corn Stover and Sandstone

Porous β-Silicon carbide (β-SiC) is an important ceramic material due to its superior properties, such as high surface area, excellent chemical and mechanical stability, and high resistance toward oxidation and corrosion. In this study, inexpensive and easily obtained corn stover and sandstone were used as the carbon and silicon sources, respectively, and porous β-SiC was effectively synthesized with a high yield. The synthesized β-SiC was characterized by XRD, Raman, SEM, TEM, and TGA, and the gaseous products were also analyzed with an integrated furnace-MS system. The results show that the produced β-SiC exhibited a nanostructure that followed the graphitic carbon template derived from the pyrolysis of the corn stover. The surface area as high as 397 m²/g, the pore volume of 0.4 cm³/g, as well as the majority pore diameters of 3–6 nm were achieved. CO and CO₂ were released during the reaction between vaporized SiO and graphite. The effect of temperature in the range of 1000 to 1700 °C was also studied, and the results point to a strong dependence between the process temperature and the yield and density of β-SiC. Also, the possible mechanism of synthesized β-SiC was proposed and confirmed with experimental results. This study provides a simple and an eco-friendly carbothermal reduction approach to produce nanoporous β-SiC with agriculture waste and sandstone, which could help establish the green economy in the US.

更新日期：2020-10-05

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