改性层状双氢氧化物对铜离子(Ⅱ)和双酚A的协同吸附

doi:10.11944/j.issn.1000-0518.2015.07.140444

摘要/Abstract

摘要：

采用离子交换法制备了十二烷基苯磺酸根(DBS^-)和柠檬酸根(Cit^3-)复合改性层状双氢氧化物(LDHs),简写为DBS-Cit-LDHs。利用粉末X射线衍射分析、红外光谱分析、比表面积测定以及元素分析等技术手段对样品进行了表征。结果表明,DBS^-和Cit^3-已柱撑进入LDHs层间。研究了DBS-Cit-LDHs对水中重金属离子Cu²⁺和有机污染物双酚A(BPA)的协同吸附性能。吸附实验结果表明,DBS-Cit-LDHs能同时高效去除Cu²⁺和BPA;对Cu²⁺的强吸附能力缘于DBS-Cit-LDHs层间Cit^3-与Cu²⁺形成了稳定配合物;对BPA的强吸附能力缘于分配作用,且吸附能力与样品比表面积无关。 DBS-Cit-LDHs对Cu²⁺的吸附动力学和热力学分别符合准二级动力学方程和Freundlich等温式;对BPA的吸附分别符合准一级动力学方程和Linear等温式。二者吸附过程的ΔG^o和ΔH^o均为负值,表明吸附为自发放热过程。

关键词: 层状双氢氧化物, 十二烷基苯磺酸根, 柠檬酸根, 协同吸附, 铜离子(Ⅱ), 双酚A

Abstract:

A novel type of adsorptive material, dodecylbenzenesulfonate(DBS)-citrate(Cit)-layered double hydroxide (LDHs), DBS-Cit-LDHs, was synthesized by modifying Mg-Al LDHs with both DBS^- and citrate^3- anions using ion-exchange method. DBS-Cit-LDHs was characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, low-temperature N₂ adsorption, and elemental analysis. The surface property and structure of DBS-Cit-LDHs are significantly altered from Mg-Al LDHs. Batch adsorption experiments indicate that DBS-Cit-LDHs can simultaneously adsorb biphenol A(BPA) and Cu²⁺ from the mixed solution. The adsorption kinetics of Cu²⁺ and BPA can be well fitted with the pseudo-second order kinetic model and pseudo-first order kinetic model, respectively. The adsorption isotherm of Cu²⁺ and BPA can be well fitted with the Freundlich and Linear equations, respectively. BPA adsorption is attributed to a partition retention mechanism. Cu²⁺ adsorption is dominated by the formation of complexes between Cu²⁺ and citrate^3- anions in the interlayer of DBS-Cit-LDHs. The negative values of ΔG^o and ΔH^o observed for BPA and Cu²⁺ adsorption confirm the spontaneity and exothermic nature, respectively. These results indicate the potential application of DBS-Cit-LDHs in treating wastewater containing both organic compounds and heavy metals.

Key words: layered double hydroxides, dodecylbenzenesulfonate, citrate, simultaneous adsorption, copper ion(Ⅱ), biphenol A

中图分类号:

李燕, 王国旺, 王宁. 改性层状双氢氧化物对铜离子(Ⅱ)和双酚A的协同吸附[J]. 应用化学, 2015, 32(7): 816-824.

LI Yan, WANG Guowang, WANG Ning. Simultaneous Adsorption of Copper Ion(Ⅱ) and Biphenol A onto Citrate-modified Layered Double Hydroxides with Dodecylbenzenesulfonate[J]. Chinese Journal of Applied Chemistry, 2015, 32(7): 816-824.

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