Relative distribution of Cd2+ adsorption mechanisms on biochars derived from rice straw and sewage sludge
Open accessAbstract
Qualitative and quantitative characterization of Cd 2+ adsorption mechanisms was performed with rice-straw and sewage-sludge biochars produced at different temperature (300-700 °C), respectively. The pH effect, adsorption kinetics and isotherms were investigated, and chemical analyses of Cd 2+-loaded biochars were conducted by SEM-EDS, XRD, FTIR and Boehm titration. This demonstrated that rice-straw biochars (RSBs) have greater adsorption capacities for Cd 2+ than sewage-sludge biochars (SSBs), which was mainly due to precipitation and cation exchange mechanisms, with their contribution proportion to total adsorption from 76.1% to 80.8%. While in SSBs, both mechanisms were overshadowed by coordination with π electrons mechanism accounting for 59.2%-62.9% of total adsorption, even the role of cation exchange was negligible in the adsorption mechanisms accounting for 2.3%-6.7%. The relationship of each mechanism with biochar's properties were discussed, which further deepen our understanding of adsorption on biochars. These results suggest RSBs have great potential for removing Cd 2+ from aqueous solutions.
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- Authors
- Gao, L.-Y., Deng, J.-H., Huang, G.-F., Li, K., Cai, K.-Z., Liu, Y., & Huang, F.
- Affiliations
- South China Agricultural University (CN)
- China Academy of Engineering Physics (CN)
- Corresponding author
- Huang, Fei
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2019-01
- Volume
- 272
- Pages
- 114-122
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W2893818424
- Cited by
- 321
- References
- 46
- Citations by year
- 2026: 23 · 2025: 26 · 2024: 51 · 2023: 46 · 2022: 50 · 2021: 62 · 2020: 41 · 2019: 20 · 2018: 2
- FWCI
- 13.66
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Bioresource Technology (acceptedVersion)
- PubMed (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Funders
- Natural Science Foundation of Guangdong Province (2014A030310320, 2017A030313177)
- National Natural Science Foundation of China (41501338)
- National Basic Research Program of China (2017YFD0801000)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Keywords
- cadmium adsorption, biochar, rice straw biochar, sewage sludge biochar, adsorption mechanism, precipitation chemistry, cation exchange, adsorption isotherms, adsorption kinetics, pH effect, heavy metal removal from water, pyrolysis temperature
- MeSH terms
- Adsorption, Cadmium, Charcoal, Kinetics, Oryza, Sewage
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