响应面法优化鱿鱼墨黑色素吸附六价铬离子条件

以鱿鱼墨黑色素为吸附剂，在黑色素粉碎粒径90 目和质量浓度15 mg/mL条件下，进行六价铬离子Cr（Ⅵ）吸附条件优化研究，并探讨吸附机制。通过吸附温度、吸附时间和溶液pH值三因素三水平Box-Behnken响应面试验分析，确定鱿鱼墨黑色素吸附Cr（Ⅵ）最佳条件为吸附温度35 ℃、吸附时间90 min、溶液pH 5.2。在确定的最优吸附条件下，鱿鱼墨黑色素对总铬离子实际清除率达到64.86%。扫描电镜结果显示吸附Cr（Ⅵ）后鱿鱼墨黑色素的球形颗粒相互聚集形成大量聚合物，红外光谱分析揭示鱿鱼墨黑色素的羟基、氨基、酰胺键Ⅲ与铬离子吸附有关。

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

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.