Journal
BIOREMEDIATION JOURNAL
Volume 19, Issue 2, Pages 171-182Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10889868.2015.1029115
Keywords
methylene blue; surface modification; phenol; rice straw; chemical characterization; biochar
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Funding
- Deanship of Scientific Research at King Saud University [RGP-VPP-184]
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Biochar derived from agricultural biomass waste is increasingly recognized as a multifunctional material for various applications according to its characteristics. In this study, rice straw-derived biochars were produced at different temperatures (550, 650, 750 degrees C), then they were modified by using different oxidizing agents, including KOH, HNO3, H2SO4, H2O2, and KMnO4. The influence of carbonization temperature and the oxidizing agent's nature on the surface chemistry was investigated. Fourier transform infrared (FTIR) analysis detected lactone, carbonyl, quinone or conjugated quinone, carboxyl-carbonate structure, and alcohol groups in most of the oxidized samples. Modified biochars have low pH values compared with their parent biochars. This is due to the fact that most treatments of biochar increase the acidic functional groups on the surface. Modified biochars presented greater capacities for adsorption of organic species of different molecular sizes such as iodine, phenol, and methylene blue from solutions. Such behavior proves that the most important surface properties of these biochars affecting their solution adsorption behavior are their acidity/alkalinity and hydrophilicity.
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