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Studies on adsorption of phenol and 4-nitrophenol on MgAl-mixed oxide derived from MgAl-layered double hydroxide
Chen, Shuangling; Xu, Zhi Ping; Zhang, Qian; Lu, G. Q. Max; Hao, Zheng Ping; Liu, Shaomin
2009
Conference NameMini Symposium on Advanced Technologies for Environments Remediation
Conference Date2007-06-03
Conference PlaceHong Kong Univ Sci & Technol, Hong Kong, PEOPLES R CHINA
ISSN1383-5866
Department环境纳米材料实验室
AbstractIn 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.
KeywordAdsorption Phenols Layered Double Hydroxide (Ldh) Reconstruction Isotherm
DOI10.1016/j.seppur.2009.03.016
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Document Type会议论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/24674
Collection环境纳米技术与健康效应重点实验室
Recommended Citation
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],2009.
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