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Optimization of Removal of Hexavalent Chromium from Aqueous Solution by Adsorption onto Squid Ink Melanin Using Response Surface Methodology

WEI Rong-bian1, LU Ting-ting2, WANG Yang-guang2, SONG Ru2,*   

  1. 1. College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316022, China;
    2. College of Food Science and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China
  • Online:2014-10-25 Published:2014-11-07

Abstract:

In the present study, squid (Ommastrephes bartrami) melanin was employed to adsorb Cr(Ⅵ) in aqueous
solutions. Three adsorption conditions (temperature, time and pH) for Cr(Ⅵ) onto squid melanin powder with a granularity of
90 mesh at a concentration of 15 mg/mL were optimized by response surface methodology based on a Box-Behnken model.
The observed removal rate of total chromium ions was 64.86% under the optimal adsorption conditions: 35 ℃, 90 min
and pH 5.2. Scanning electron microscopy (SEM) demonstrated massive aggregation of the spherical granules of squid
melanin upon adsorption of Cr(Ⅵ). Fourier transform infrared (FT-IR) spectroscopy revealed that hydroxyl, amino and
amide groups were the potential binding sites for chromium ions.

Key words: squid ink, melanin, hexavalent chromium, removal activity, response surface methodology, scanning electron microscopy, Fourier transform infrared spectroscopy

CLC Number: