• 关键词：球形棕囊藻  重金属  生物吸附  动力学  Pb²⁺

• 基金项目：广东省自然科学基金重点项目(No.04105835);国家自然科学基金(No.40673062)

• 黄月华
• 暨南大学生命科学技术学院, 广州 510632

• 尹平河
• 暨南大学生命科学技术学院, 广州 510632

• 赵玲
• 暨南大学生命科学技术学院, 广州 510632

• 黄凤
• 暨南大学生命科学技术学院, 广州 510632

• 摘要：研究了球形棕囊藻对金属离子Pb²⁺在球形棕囊藻上的生物吸附特性.结果显示,Pb²⁺在球形棕囊藻上的生物吸附可以分为2个阶段,第1阶段为物理吸附,在10min内快速达到平衡;第2阶段为金属离子向藻内部的迁移,过程缓慢.通过拟合得到了吸附过程的准二级动力学方程,参数k为0.0025g·mg^-1·min^-1,q_e为19.8mg·g^-1.吸附等温线结果表明,Pb²⁺在球形棕囊藻上的生物吸附可以用Langmuir来描述,最大吸附量q_max为20.2mg·g^-1.

• Abstract：Kinetics and equilitrium isotherm of Pb²⁺ biosorption by algae biomass of Phaeocystis globosa were investigated in this study.The experimental results showed that the process of Pb²⁺ biosorption onto the algae biomass of phaeocystis globosa took place in two stages.The first stage was a physical sorption and reached equilibrium within 10minutes.The second stage was a slow migration of Pb²⁺ to the interior of the algae biomass.The biosorption kinetics could be described quite well by the pseudo second-order equation(R²=0.999).The kinetic parameters q_e and k were 19.8 mg·g^-1 and 0.0025 g·mg^-1·min^-1,respectively.The equilibrium isotherm could be fitted by the Langmuir model.The algae biomass of Phaeocystis globosa demonstrated a maximum Pb²⁺ biosorption capacity of 20.2 mg·g^-1.

• Key words：Phaeocystis globosa  heavy metal  biosorption  kinetics  equilibrium  Pb²⁺

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