Affiliation:
1. Frontier Research Institute for Interdisciplinary Sciences (FRIS) Tohoku University 6‐3 Aoba, Aramaki, Aoba‐ku Sendai 980–8578 Japan
2. Graduate School of Engineering Tohoku University 6‐6‐11 Aoba, Aramaki, Aoba‐ku Sendai 980‐8579 Japan
3. Graduate School of International Resource Sciences Akita University 1‐1, Tegata‐Gakuenmachi Akita 010‐8502 Japan
Abstract
AbstractOwing 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.
Funder
Japan Society for the Promotion of Science
Tohoku University