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Iron-modified Biochar Derived from Rice Straw for Aqueous Phosphate Removal |
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| รหัสดีโอไอ | |
| Creator | Usarat Thawornchaisit |
| Title | Iron-modified Biochar Derived from Rice Straw for Aqueous Phosphate Removal |
| Contributor | Korawan Donnok Natchaphat Samphoanoi Pimwimon Pholsil |
| Publisher | King Mongkut's Institute of Technology Ladkrabang |
| Publication Year | 2562 |
| Journal Title | Current Applied Science and Technology |
| Journal Vol. | 19 |
| Journal No. | 3 |
| Page no. | 263-275 |
| Keyword | biochar modification phosphorus removal pyrolysis |
| URL Website | https://www.tci-thaijo.org/index.php/cast |
| Website title | https://www.tci-thaijo.org/index.php |
| ISSN | 2586-9396 |
| Abstract | Conversion of rice straw to biochar, followed by chemical modification of the biochar with iron salts under alkaline conditions can turn agricultural biomass waste into a useful adsorbent material for phosphorus removal. Study of the rice straw-to-biochar conversion process at various pyrolysis temperatures showed that biochar yield decreased with increased pyrolysis temperature: The yield of stable organic matter and specific surface area was found to be optimum at 400oC. An Fe coating process, through direct precipitation of FeCl3.6H2O or co-precipitation of FeCl3.6H2O and FeSO4.7H2O on biochar, led to Fe-modified rice straw biochars. Based on physical appearance, SEM, FT-IR and XRF, we confirmed that Fe was well retained in the biochar. The pHpzc was approximately 7.6 and 8.0 for Fe(III)+Fe(II)-modified biochar and Fe(III) modified biochar. Therefore, the modified biochar could attract negatively charged phosphate species in a system, like natural water or domestic wastewater, where pH is normally less than their pHpzc. In laboratory batch adsorption tests, phosphate removal efficiency was enhanced, rising from about 35.4% in the unmodified biochar to 69.5% in Fe(III)+Fe(II)-modified biochar and 83.0% in Fe(III) modified biochar. |
