Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (7): 816-824.DOI: 10.11944/j.issn.1000-0518.2015.07.140444

• Full Papers • Previous Articles     Next Articles

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

LI Yan*, WANG Guowang, WANG Ning   

  1. Department of Chemistry,Changzhi College,Changzhi,Shanxi 046011,China
  • Received:2014-12-25 Accepted:2015-03-27 Published:2015-06-30 Online:2015-06-30
  • Contact: Yan LI
  • Supported by:
    Project supported by the Natural Science Foundation of Shanxi Province(No.2013011040-8), National Training Programs of Innovation and Entrepreneurship for Undergraduates(No.201310122002), Training Programs of Innovation and Entrepreneurship for Undergraduates in Shanxi Province(No.2014431), Teaching Reform Project of Colleges and Universities in Shanxi Province(No.J2013104), the Twelfth Five Year Plan Project of Education Science in Shanxi Province(No.GH-12086)

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 citrate3- 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 ΔGo and ΔHo 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

CLC Number: