Studies on adsorption of phenol and 4-nitrophenol on MgAl-mixed oxide derived from MgAl-layered double hydroxide
文献类型：会议论文
| 作者 | Chen, Shuangling; Xu, Zhi Ping; Zhang, Qian; Lu, G. Q. Max; Hao, Zheng Ping; Liu, Shaomin |
| 出版日期 | 2009 |
| 会议名称 | Mini Symposium on Advanced Technologies for Environments Remediation |
| 会议日期 | 2007-06-03 |
| 会议地点 | Hong Kong Univ Sci & Technol, Hong Kong, PEOPLES R CHINA |
| 关键词 | Adsorption Phenols Layered double hydroxide (LDH) Reconstruction Isotherm |
| 英文摘要 | In this research, the removal of two phenols (4-nitrophenol and phenol) from aqueous solution was investigated using MgAl-mixed oxide. This oxide was prepared by calcining crystalline MgAl-CO3-layered double hydroxide (LDH) at 500 degrees C for 4 h. we found that it takes 10-12 h for adsorption of 4-nitrophenol to reach the equilibrium at room temperature while the equilibrium time is 20-25 h for phenol adsorption. The kinetic process of 4-nitrophenol adsorption seemingly follows the first-order reaction but phenol is adsorbed in a pseudo-second-order model. We also noted that the maximum adsorption amount of 4-nitrophenol by fitted three-parameter Langmuir-Freundlich isotherm is 367.8 mg/g, much higher than that of phenol (46.9 mg/g). The differences in the adsorption kinetics and dynamics have been related to the adsorption mechanism and adsorbate-adsorbent interactions. The reconstruction of MgAl-mixed oxide in aqueous solution incorporates 4-nitrophenolate into the interlayer. However, it is difficult to intercalate phenolate due to its weaker affinity for LDH in comparison with OH-. In addition, adsorption of MgAl-mixed oxide for 4-nitrophenol and phenol is slightly affected by the initial pH, but considerably facilitated by increasing the adsorption temperature. (c) 2009 Elsevier B.V. All rights reserved. |
| ISSN号 | 1383-5866 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/24674]  |
| 专题 | 生态环境研究中心_环境纳米材料实验室 |
| 推荐引用方式 GB/T 7714 | Chen, Shuangling,Xu, Zhi Ping,Zhang, Qian,et al. Studies on adsorption of phenol and 4-nitrophenol on MgAl-mixed oxide derived from MgAl-layered double hydroxide[C]. 见:Mini Symposium on Advanced Technologies for Environments Remediation. Hong Kong Univ Sci & Technol, Hong Kong, PEOPLES R CHINA. 2007-06-03. |
入库方式： OAI收割
来源：生态环境研究中心
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