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Citation: 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. doi: 10.11944/j.issn.1000-0518.2015.07.140444 shu

Simultaneous Adsorption of Copper Ion (Ⅱ) and Biphenol A onto Citrate-modified Layered Double Hydroxides with Dodecylbenzenesulfonate

1.
Department of Chemistry, Changzhi College, Changzhi, Shanxi 046011, China

Corresponding author: LI Yan,
Received Date: 25 December 2014
Available Online: 2 February 2015
Fund Project: 山西省自然科学基金项目(2013011040-8) (2013011040-8)国家级大学生创新训练项目(201310122002) (201310122002)山西省大学生创新训练项目(2014431) (2014431)山西省高等学校教学改革项目(J2013104) (J2013104)山西省教育科学"十二五"规划项目(GH-12086)资助 (GH-12086)

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 citrate3-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.
- layered double hydroxides,
- dodecylbenzenesulfonate,
- citrate,
- simultaneous adsorption,
- copper ion (Ⅱ),
- biphenol A
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