화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.34, No.8, 2225-2235, August, 2017
DOI10.1007/s11814-017-0116-z  Export Citation
Response surface approach for optimization of Hg(II) adsorption by 3-mercaptopropyl trimethoxysilane-modified kaolin minerals from aqueous solution
Şakir Yılmaz, Tekin Şahan†, and Abdulkerim Karabakan1
  • Department of Chemical Engineering, Faculty of Engineering, Yuzuncu Yil University, 65080, Van, Turkey
  • 1Department of Chemistry, Faculty of Science, Hacettepe University, 06800, Ankara, Turkey
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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 30.83mg/L, 0.1 g, 7.44 and 31.41 °C for Co, adsorbent dosage, initial pH, and T (°C), respectively. With the obtained model, the maximum amount of adsorbed Hg(II) and %Hg(II) removed was calculated to be 30.10mg/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.
Keywords:Adsorption;Central Composite Design;Kaolin;Mercapto;Mercury;Response Surface Methodology
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