| 卿朝霞,付敬,袁林,曾新颜,魏维科,杨丽华.TiO2-SiO2改性香蕉皮生物炭对水中二氯喹啉酸吸附性能研究[J].农业环境科学学报,2023,42(3):632-640. |
| TiO2-SiO2改性香蕉皮生物炭对水中二氯喹啉酸吸附性能研究 |
| A study on the adsorption of quinclorac in water using TiO2-SiO2 modified banana peel biochar |
| 投稿时间：2022-07-28 |
| DOI：10.11654/jaes.2022-0764 |
| 中文关键词: 香蕉皮生物炭|TiO2|SiO2|改性|吸附|二氯喹啉酸 |
| 英文关键词: banana peel biochar|TiO2|SiO2|modification|adsorption|quinclorac |
| 基金项目:湖南省教育厅项目（19C0919） |
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| 中文摘要: |
| 为了寻找有效去除污水中二氯喹啉酸（QNC）的方法，以农业废弃物香蕉皮为原料，磷酸、TiO2和SiO2为活化剂，制备了TiO2-SiO2改性香蕉皮生物炭（Ti-Si-BC）。采用扫描电镜（SEM）、X射线衍射（XRD）、红外光谱（FTIR）、比表面积法（BET）和元素分析（EDS）等手段对改性前后生物炭的物理化学性质进行表征，研究了Ti-Si-BC对QNC的吸附机理以及接触时间、初始浓度、温度和吸附剂用量等因素对吸附效果的影响。结果表明：磷酸、TiO2和SiO2的协同改性显著提高了生物炭的比表面积并增加了吸附点位。在QNC初始浓度为60 mg·L-1时，Ti-Si-BC对QNC的吸附率是天然香蕉皮生物炭（BC）的2.5倍。Ti-Si-BC对QNC的吸附动力学过程更符合准二级动力学模型，说明吸附包括表面的物理吸附和内部的化学扩散。等温吸附过程更符合Freundlich模型，说明吸附为非均相多层吸附。热力学结果表明该吸附为吸热的自发反应。Ti-Si-BC对QNC吸附的机理主要包括孔隙填充、静电和氢键等作用，其吸附效果较BC明显提高，具有良好的应用潜力。 |
| 英文摘要: |
| 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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