期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 692, 期 -, 页码 844-853出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.07.125
关键词
Rice husk; Biochar; Hierarchical porous carbon; Mesoporosity; Adsorption; Copper
资金
- Ministry of Science and Technology, Taiwan [106-2221-E-002-020-MY3]
- Soil and Groundwater Remediation Fund Management Board
- Environmental Protection Administration and the Executive Yuan, Taiwan [108C002855]
- National Taiwan University (NTU) Research Center for Future Earth from the Featured Areas Research Center Program by the Ministry of Education (MOE) in Taiwan [108L901003]
High-quality meso/micropore-controlled hierarchical porous carbon (HPC) was synthesized by a hard template method utilizing rice husk biochar and then used to adsorb copper ions from an aqueous solution. The preparation procedure included two main steps: base leaching and physicochemical activation. During the activation process, the porosity characteristics (i.e., specific surface area and meso/micropore ratio) were controlled by altering the KOH impregnation ratio, activation time, and temperature under the CO2 atmosphere. In addition, a copper adsorption study was performed using three HPC samples with different pore structures and characteristics. The results of this study indicate that the adsorption capacity of HPC material derived from rice husk biochar is strongly influenced by its meso/micropore ratio. As evidenced, HPC 3-0.5-800, which was impregnated by a KOH:biochar ratio of 3 and activated at 800 degrees C for 0.5 h under a CO2 atmosphere, has a very high specific surface area of 2330 m(2) g(-1) with an 81% mesopore to total specific surface area. Importantly, it exhibited a superior adsorption capacity of 265 mg g(-1) and rapid adsorption kinetics for copper ions. The improvement is ascribed to the high specific surface area and favorable hierarchical structure. The findings demonstrate the feasibility of controlling the hierarchical pore structure of rice husk biochar-derived carbons as high-performance adsorbents for copper ion removal from water. (C) 2019 Elsevier B.V. All rights reserved.
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