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| A study on the adsorption of quinclorac in water using TiO2-SiO2 modified banana peel biochar |
| Received:July 28, 2022 |
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| KeyWord:banana peel biochar|TiO2|SiO2|modification|adsorption|quinclorac |
| Author Name | Affiliation | E-mail | | QING Zhaoxia | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Institute of Agricultural Environmental Protection, Hunan Agricultural University, Changsha 410128, China | | | FU Jing | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | YUAN Lin | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | ZENG Xinyan | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | WEI Weike | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Institute of Agricultural Environmental Protection, Hunan Agricultural University, Changsha 410128, China | | | YANG Lihua | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Institute of Agricultural Environmental Protection, Hunan Agricultural University, Changsha 410128, China | 44067507@qq.com |
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| Abstract: |
| To find an effective method of removing quinclorac（QNC）from polluted water, TiO2-SiO2 modified banana peel biochar（Ti-SiBC）was prepared from banana peel（agricultural waste）and modified using phosphoric acid, TiO2, and SiO2. Scanning electron microscopy （SEM）, X -ray diffraction（XRD）, fourier-transform infrared spectroscopy（FTIR）, specific surface area method（BET）, and elemental analysis（EDS）were used to characterize the physical and chemical properties of the modified and pristine biochar. The adsorption mechanism of Ti-Si-BC on QNC and the effects of contact time, initial concentration of QNC, temperature, and amount of adsorbent on the adsorption effect were studied. The results showed that the synergistic modification of phosphoric acid, TiO2, and SiO2 significantly increased the specific surface area and adsorption sites of biochar. When the initial concentration of QNC was 60 mg·L-1, the adsorption rate of Ti-Si-BC on QNC was 2.5 times that of natural banana peel biochar（BC）. The adsorption kinetics of QNC on Ti-Si-BC was more in line with the quasi-second-order kinetic adsorption model, which included physical adsorption on the surface and internal chemical diffusion. The isothermal adsorption process was more consistent with Freundlich model, which is a heterogeneous multilayer adsorption. Thermodynamic results showed that the adsorption of QNC on Ti-Si-BC was a spontaneous and endothermic reaction. Void filling， electrostatics, and hydrogen bonding were the main mechanisms for the removal of QNC through Ti-Si-BC adsorption. The adsorption capacity of Ti-Si-BC was significantly improved compared with that of BC, indicating that Ti-Si-BC had a good application prospect for the removal of QNC in water. |
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