黑藻吸附Cu2+机制研究

生物吸附法是一种经济有效的去除废水中有害重金属离子的方法.以黑藻(Hydrilla verticillata)干样为生物吸附材料,研究了黑藻对水体中Cu<'2+>等温吸附的基本特征,并通过测定吸附前后溶液离子浓度变化以及pH值、基团屏蔽对Cu<'2+>吸附的影响,结合红外光谱技术,从静电吸附作用、离子交换作用、基团作用...

Study on Mechanisms of Cu2+ Biosorption by Aquatic Plant Hydrilla verticillata (L.f.) Royle

Biosorption is a kind of effective and economical method to get rid of heavy metals from polluted waters. The isotherm adsorption of Cu²⁺ by Hydrilla verticillata (L.f.) royle was investigated. In addition, through testing cation concentrations before and after the isotherm adsorption as well as the effects of pH and blocking of functional groups on Cu²⁺ adsorption abilities, mechanisms of Cu²⁺ biosorption were discussed from several aspects such as electrostatic adsorption, ion exchange, complexation. Results indicated that biosorption equilibrium data were best described by Langmuir isotherm model followed by Freundlich model and Double Langmuir model. This adsorbent can remove about 70% of Cu²⁺ and has the maximum adsorption capacity of 42.86 mg/g for Cu²⁺. Moreover, electrostatic adsorption, ion exchange and functional groups are supposed to responsible for biosorption of Cu²⁺. Through blocking functional groups combined with the analysis of FTIR, carboxyl and amino groups are confirmed to be the main active groups which were involved in the biosorption of Cu²⁺. In conclusion, dried H. verticillata can provide a promising technology for eliminating copper from industrial effluents.