厌氧颗粒污泥藻酸盐对铜离子的吸附研究
Copper recovery by bacterial alginate extracted from anaerobic granular sludge
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摘要: 从厌氧颗粒污泥中成功提取出细菌藻酸盐并制备成藻酸钙吸附剂,研究其对水中Cu2+的吸附性能。实验结果表明,接触时间、Cu2+初始浓度和溶液初始pH是影响Cu2+吸附性能的重要因素。吸附等温线研究表明,Langmuir模型比Freundlich模型能更好地描述吸附过程。Cu2+在藻酸钙上的吸附动力学过程可以很好地用Pseudo二级动力学方程来描述。以100 mmol/L HCl为解吸剂,可有效洗脱藻酸钙上95%的CuAbstract: The biosorption property of copper by the dried Ca-alginate extracted from anaerobic granular sludge was investigated in batch system. The experimental results showed that the contact time, Cu2+ initial concentration and solution initial pH had significant effects on Cu2+ biosorption capacity. Accumulation of Cu2+ followed Langmuir adsorption isotherm better than Freundlich adsorption isotherm. The biosorption kinetics was described by the Pseudo-secondorder equation quite well. The Ca-sludge alginate bioadsorbent could be regenerated by 100 mmol/L HCl with 95% Cu2+ recovery.
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Key words:
- copper /
- bacterial alginates /
- biosorption
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