| ZnO/C纳米球的亚甲基蓝单吸附特性:平衡、动力学及机理 |
| Single Adsorption Capacity of Methylene Blue on ZnO/C Nanosphere: Equilibrium, Kinetics and Mechanism |
| 作者 | 单位 | E-mail | | 李君 | 新疆大学应用化学研究所, 能源材料化学教育部重点实验室, 先进功能材料新疆维吾尔自治区重点实验室, 乌鲁木齐 830046 | | | 王鲁香 | 新疆大学应用化学研究所, 能源材料化学教育部重点实验室, 先进功能材料新疆维吾尔自治区重点实验室, 乌鲁木齐 830046 | | | 曹亚丽 | 新疆大学应用化学研究所, 能源材料化学教育部重点实验室, 先进功能材料新疆维吾尔自治区重点实验室, 乌鲁木齐 830046 | | | 贾殿赠 | 新疆大学应用化学研究所, 能源材料化学教育部重点实验室, 先进功能材料新疆维吾尔自治区重点实验室, 乌鲁木齐 830046 | jdz@xju.edu.cn |
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| 摘要: 采用电弧放电法制备了ZnO/C纳米球，利用FESEM、XRD和N2吸附/脱附测试进行了表征。在避光条件下研究了复合材料对亚甲基蓝的吸附性能。研究结果表明，随着亚甲基蓝的浓度及接触时间的增长吸附量明显上升，在吸附时间为150 min时达到吸附平衡。采用Langmuir、Freundlich及Temkin等温吸附模式对吸附平衡进行了研究。结果表明，吸附等温线符合Langmuir等温吸附模式，单层吸附饱和容量可达188.68 mg·g-1。利用动力学模型、内扩散模型和外扩散速率控制模型拟合实验数据，拟合数据表明其动力学符合伪二级动力学模型；内扩散机理不是吸附速率的唯一限制机理，亚甲基蓝的总吸附速率受膜扩散控制。 |
| 关键词: ZnO/C纳米球 碳 纳米材料 亚甲基蓝 吸附等温线 动力学 |
| 基金项目: 国家973计划前期研究专项（No.2014CB660805）、国家自然科学基金（No.U1203292）和新疆维吾尔自治区自然科学基金（No.2013211B15）资助项目。 |
| Abstract: Carbon-inorganic ZnO/C nanosphere hybrid materials was simply prepared by arc discharge method. The hybrid materials was characterized by field-emission scanning electron microscopy(FE-SEM), X-ray diffraction(XRD) and BET surface area. The adsorption property of methylene blue (MB) on ZnO/C nanosphere was carried out under the dark conditions. Results showed that the adsorption uptake increased as the increase of initial MB concentration and contact time, and the process reached equilibrium at the time of 150 min. Langmuir, Freundlich and Temkin isotherm were employed to describe the adsorption equilibrium. The isotherm study indicated that Langmuir model fitted well with the adsorption data, and a monolayer saturation capacity of 188.68 mg·g-1 was obtained. Kinetic models, Webbers pore diffusion model and Boyds equation were applied for the experimental data to study the adsorption mechanism. Results shows that the kinetics followed the pseudo-second order kinetic model and the adsorption process was controlled by film diffusion as opposed intraparticle diffusion mechanism. The results indicate that the ZnO/C nanosphere is also a promising material for the adsorption of MB from aqueous solutions. |
| Keywords: ZnO/C nanosphere carbon nanomaterials methylene blue isotherm kinetics |
| 投稿时间：2016-03-30 修订日期：2016-08-24 |
| 摘要点击次数: 1534 |
| 全文下载次数: 1844 |
| 李君,王鲁香,曹亚丽,贾殿赠.ZnO/C纳米球的亚甲基蓝单吸附特性:平衡、动力学及机理[J].无机化学学报,2016,32(9):1603-1610. |
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