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| Influence of Elution of Biochar on Its Adsorption of Cu（Ⅱ） |
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| KeyWord:biochar; by-product; elution; adsorption; Cu2+ |
| Author Name | Affiliation | | GUO Yue | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | TANG Wei | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | DAI Jing-yu | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | HU Lin-chao | Changzhou Academy of Environmental Science, Changzhou 213022, China | | ZHU Qing-teng | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | WANG Lei | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China |
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| Abstract: |
| During production, biochars often adsorb pyrolysis by-products such as tar, pyroligneous liquor, and inorganic salts, which may influence the adsorption of the biochars. In this study, freshly prepared biochar was soaked and rinsed using 4 different solvents（ultrapure water, dilute acid, dilute alkali solution and ethanol）. The supernatants obtained from different elution treatments were analyzed using a gas-chromatography mass spectrometer（GC-MS）. The surface properties of biochar before and after elution were studied by diffuse reflectance infrared Fourier transform spectroscopy（DRIFTS）. The adsorption of Cu2+ by the eluted biochar was investigated by batch equilibrium method. The main components of pyrolysis by-products were organic acids, alcohols, ethers, esters, aldehydes, and ketones. All elution solvents could remove the by-products to certain extents. However, data of both DRIFTS and GC-MS showed that alkali-water and acid-water could react with biochar and pyrolysis by-products or promote the hydrolysis of biochar, thus modifying the surface properties of biochar and in turn its adsorption. Alcohol-water and water had the least influences on biochar properties and could be used to pre-treat biochars. |
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