Abe Hiroya, Nakayasu Yuta, Haga Kazutoshi, Watanabe Masaru
Frontier Research Institute for Interdisciplinary Sciences (FRIS) Tohoku University 6-3 Aoba, Aramaki, Aoba-ku Sendai 980-8578 Japan.
Graduate School of Engineering Tohoku University 6-6-11 Aoba, Aramaki, Aoba-ku Sendai 980-8579 Japan.
Glob Chall. 2023 Jul 19;7(8):2300112. doi: 10.1002/gch2.202300112. eCollection 2023 Aug.
Owing to the increasing global demand for carbon resources, pressure on finite materials, including petroleum and inorganic resources, is expected to increase in the future. Efficient utilization of waste resources has become crucial for sustainable resource acquisition for creating the next generation of industries. Rice husks, which are abundant worldwide as agricultural waste, are a rich carbon source with a high silica content and have the potential to be an effective raw material for energy-related and environmental purification materials such as battery, catalyst, and adsorbent. Converting these into valuable resources often requires separation and carbonization; however, these processes incur significant energy losses, which may offset the benefits of using biomass resources in the process steps. This review summarizes and discusses the high value of RHs, which are abundant as agricultural waste. Technologies for separating and converting RHs into valuable resources by hydrothermal carbonization are summarized based on the energy efficiency of the process.
由于全球对碳资源的需求不断增加，包括石油和无机资源在内的有限材料未来面临的压力预计将会增大。有效利用废弃物资源对于可持续获取资源以创建下一代产业而言已变得至关重要。稻壳作为农业废弃物在全球储量丰富，是一种富含碳且二氧化硅含量高的资源，有潜力成为用于电池、催化剂和吸附剂等能源相关及环境净化材料的有效原材料。将这些转化为有价值的资源通常需要进行分离和碳化；然而，这些过程会产生大量能量损失，这可能会抵消在工艺步骤中使用生物质资源所带来的益处。本综述总结并讨论了作为农业废弃物储量丰富的稻壳的高价值。基于该工艺的能源效率，总结了通过水热碳化将稻壳分离并转化为有价值资源的技术。
