| 摘要: |
| 褐藻渣是褐藻工业产生的固体废弃物, 直接排放到环境中容易破坏水体生态平衡。本研究用硅胶固定的褐藻渣吸附重金属Cu2+, 并对其吸附特征进行了检测。结果表明, 吸附pH、Cu2+初始浓度以及吸附时间对吸附过程均有很大的影响。该吸附材料对初始浓度在2.0 mmol/L 以下的Cu2+溶液吸附率可达85%, 25℃ 时最大吸附容量在0.7～0.8 mmol/g 之间; 其吸附等温线符合Langmuir 、Dubimim-Radushkevich 方程, 基本符合Freundlich 方程; 吸附动力学过程符合伪二级动力学模型, 说明吸附限速步骤是化学吸附过程; 实验结果表明硅胶固定的褐藻渣可以用于吸附Cu2+, 其成本低廉, 选择性好。 |
| 关键词: 生物吸附 褐藻渣 固定化 Cu2+ |
| DOI： |
| 分类号: |
| 基金项目:国家863 计划项目(2006AA06Z362) |
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| Biosorption of Cu2+ by silica-gel-immobilized brown algae residue |
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| Abstract: |
| Algal residues, solid wastes in brown algae industrial production, can destroy ecological balance if they are discharged directly into natural waters. We investigated the biosorption characteristics of Cu2+ by silica-gel-immobilized algal residues. The experimental data show that pH, initial Cu2+ concentrations, and contact time have significant impact on biosorption process. The removal of Cu2+ could reach about 85% when initial Cu2+ concentration was below 2mmol/L, and the maximum adsorption capacities was around 0.7～0.8mmol/g at 25 °C. We also fit our equilibrium data with Langmuir, Freundlich or Dubinin–Radushkevich isotherm models. Kinetic features of Cu2+ biosorption were modeled by pseudo first-order and pseudo second-order equations. The results indicate that the silica-gel-immobilized algal residue is low-cost, selective, easily regenerated, and of improved mechanical strength, and can be used for remove heavy metals from wastewater. |
| Key words: biosorption algal residues immobilization copper. |
