Meso/micropore-controlled hierarchical porous carbon derived from activated biochar as a high-performance adsorbent for copper removal
Abstract
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 CO 2 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°C for 0.5h under a CO 2 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 265mgg-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.
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Biochar can be used as a support for catalytic nanoparticles to take advantage of properties such as high electrical conductivity, chemical stability, tunable functional groups, and unique surface properties.
“Biochar can be used as a support for catalytic nanoparticles to take advantage of their exceptional properties such as high electrical conductivity, chemical stability, having functional groups that can easily be tuned and unique surface properties (Cuong etal. 2019; Liu etal. 2015; Xia and Larock 2010).”
From Mechanisms and adsorption capacities of biochar for the removal of organic and inorganic pollutants from industrial wastewater (2021) · cites this paper as Cuong et al. 2019
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- Authors
- Cuong, D. V., Liu, N.-L., Nguyen, V. A., & Hou, C.-H.
- Affiliations
- National Taiwan University (TW)
- Corresponding author
- Hou, Chia-Hung
- Venue
- Science of The Total Environment
- Publisher
- Elsevier BV
- Published
- 2019-11
- Volume
- 692
- Pages
- 844-853
- ISSN
- 0048-9697 (ISSN-L)
- OpenAlex
- W2961388381
- Cited by
- 119
- References
- 52
- Citations by year
- 2026: 11 · 2025: 15 · 2024: 14 · 2023: 19 · 2022: 28 · 2021: 19 · 2020: 12 · 2019: 1
- FWCI
- 5.43
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Science of The Total Environment (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Environmental Protection Administration, Executive Yuan, R.O.C. Taiwan
- Ministry of Science and Technology, Taiwan
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Materials Science › Materials Chemistry › Mesoporous Materials and Catalysis
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Keywords
- hierarchical porous carbon, rice husk biochar, copper adsorption, heavy metal removal from water, KOH activation, physicochemical activation, hard template method, specific surface area, adsorption kinetics, adsorbent preparation
- MeSH terms
- Adsorption, Charcoal, Copper, Hydroxides, Kinetics, Oryza, Waste Disposal, Fluid, Water Pollutants, Chemical, Porosity, Potassium Compounds, Water Purification
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