乌贼墨黑色素对Pb^(2+)-Cu^(2+)二元体系的吸附性能研究  

Adsorption performance of squid ink melanin(SIM) on Pb^(2+)-Cu^(2+) binary system

作　　者：张洪超 吕玲 薛张芝 宋正规 李和生[1] 王鸿飞[1] ZHANG Hong-chao;Lü Ling;XUE Zhang-zhi;SONG Zheng-gui;LI He-sheng;WANG Hong-fei(College of Food and Pharmaceutical Science, Ningbo University, Ningbo 315800, China)

机构地区：[1]宁波大学食品与药学学院,浙江宁波315800

出　　处：《中国环境科学》2019年第4期1493-1501,共9页China Environmental Science

基　　金：浙江省重大科技专项(2009C03017-3);"水产"浙江省重中之重学科开放基金(xkzsc1523);宁波市自然科学基金(2013A610156)

摘　　要：为探索新型生物吸附剂,以乌贼墨黑色素(SIM)为吸附剂,研究Pb^(2+)、Cu^(2+)单组分溶液及Pb^(2+)-Cu^(2+)二元混合体系中SIM对Pb^(2+)和Cu^(2+)的吸附效果并构建等温吸附模型.结果表明,pH值、SIM添加量、吸附时间对SIM吸附Pb^(2+)和Cu^(2+)的吸附量影响较大,而吸附温度对吸附效果影响较小;单组分吸附与二元混合体系吸附对比表明,二元混合体系中Pb^(2+)和Cu^(2+)存在竞争吸附.应用L(Langmuir)和F(Freundlich)等温吸附模型拟合了SIM对Pb^(2+)、Cu^(2+)单组分金属离子的吸附过程,其中L模型与试验结果拟合度更高;应用Non-modifiedLangmuir、ModifiedLangmuirisotherm、ExtendedLangmuir、Extended Freundlich和SRS模型5种模型对Pb^(2+)-Cu^(2+)二元混合体系的等温吸附过程进行拟合,其中Extended Langmuir模型与试验结果拟合度最佳.应用红外光谱(FTIR)分析SIM吸附金属离子的原理时发现,SIM上羟基、—NH和不饱和键是金属离子的吸附位点,且SIM对Pb^(2+)的吸附能力优于对Cu^(2+)的吸附.Squid ink melanin (SIM) was used as a new biological adsorbent to investigate absorptive efficiency of SIM to Lead ions (Pb ^2+) and copper ions (Cu^2+) from mono-component aqueous solution(Pb^2+、Cu^2+) and binary solution (Pb^2+-Cu^2+), and the isothermal adsorption model was established. The results indicated that the effects of pH, SIM addition and adsorption time on the adsorption of Pb 2+ and Cu 2+ by SIM were significant, except for adsorption temperature. The adsorption comparison between single component adsorption and binary mixed system shows, Pb^ 2+ and Cu ^2+ have competitive adsorption in binary mixed system.The single-component of Pb 2+ and Cu ^2+ adsorption by SIM were fitted to L (Langmuir) and F (Freundlich) isotherm adsorption models, and the L model has a higher fitting degree with the experimental results. The isotherm adsorption processes of Pb^ 2+-Cu^ 2+ binary system was fitted by using the Non-modified Langmuir, Modified Langmuir isotherm, Extended Langmuir, Extended Freundlich and SRS model. The result showed that Extended Langmuir model was the best fitted to the experimental results. The machanism of SIM adsorption of metal ions was analysed by FTIR. It was found that the hydroxyl,-NH and unsaturated bonds on SIM were the adsorption sites of metal ions, and the adsorption capacity of SIM to Pb^ 2+ was superior to that of Cu^ 2+.

关 键 词：乌贼墨黑色素(SIM) 竞争吸附 铅 铜 等温吸附模型 

分 类 号：X703.5[环境科学与工程—环境工程]