Response surface approach for optimization of Hg(II) adsorption by 3-mercaptopropyl trimethoxysilane-modified kaolin minerals from aqueous solution


Yılmaz Ş., Şahan T., KARABAKAN A.

KOREAN JOURNAL OF CHEMICAL ENGINEERING, vol.34, no.8, pp.2225-2235, 2017 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 34 Issue: 8
  • Publication Date: 2017
  • Doi Number: 10.1007/s11814-017-0116-z
  • Journal Name: KOREAN JOURNAL OF CHEMICAL ENGINEERING
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.2225-2235
  • Keywords: Adsorption, Central Composite Design, Kaolin, Mercapto, Mercury, Response Surface Methodology, ACTIVATED CARBON, MERCURY REMOVAL, IONS, BIOSORPTION, PB(II), KINETICS, ACID, METHODOLOGY, SILICA, COPPER

Abstract

The optimization of Hg(II) adsorption conditions from aqueous solutions with 3-mercaptopropyl trimethoxysilane-modified kaolin (MMK) used as a new adsorbent was analyzed by response surface methodology (RSM) approach. The MMK adsorbent was characterized by means of energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). According to the quadratic model obtained from central composite design (CCD) in RSM, the optimal conditions for adsorption were found to be 30.83 mg/L, 0.1 g, 7.44 and 31.41 A degrees C for C (o) , adsorbent dosage, initial pH, and T (A degrees C), respectively. With the obtained model, the maximum amount of adsorbed Hg(II) and %Hg(II) removed was calculated to be 30.10 mg/g and 98.01%, respectively. Langmuir and Dubinin-Radushkevich isotherms fitted well the experimental results. Thermodynamic studies revealed that the adsorption was physical, exothermic, spontaneous. The results indicate that MMK a new adsorbent has great potential for the removal of Hg(II) from aqueous media.