| 草分枝杆菌及其吸附Pb2+后的可浮性研究 |
| 摘要点击 1171 全文点击 1059 投稿时间：2004-12-22 修订日期：2005-03-05 |
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| 中文关键词 捕收剂 草分枝杆菌 动电位 浮选 生物吸附 |
| 英文关键词 collector Mycobacterium phlei Zeta potential flotation biosorption |
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| 中文摘要 |
| 用草分枝杆菌作吸附剂,探讨了采用生物吸附-浮选法去除水中Pb2+的可能性,并对吸附剂与捕收剂的作用机理进行了分析.草分枝杆菌的浮选试验结果表明,阳离子型捕收剂对草分枝杆菌的捕收能力明显比阴离子型捕收剂的强.草分枝杆菌的吸附-浮选试验结果表明,浮选过程可在10min左右达到终点,pH在4～7时,阳离子型捕收剂对草分枝杆菌有较好的浮选去除率,Pb2+去除率也很高.当二正丁胺的浓度为45mmol/L,pH=4.75时,草分枝杆菌和Pb2+的去除率分别达到92%和98%.动电位测试表明,草分枝杆菌的等电点为pH=3.09;吸附Pb2+或与二正丁胺发生作用后,草分枝杆菌的等电点均有所增加.草分枝杆菌细胞壁表面具有较强的负电性,使得阳离子捕收剂对其具有较强的捕收能力,这对采用生物吸附-浮选法去除废水中的重金属离子可能会有重要意义. |
| 英文摘要 |
| The possibility of removal of heavy metals from waste water by adsorption flotation using Mycobacterium phlei as adsorbent was investigated,and the collection mechanism of collectors on adsorbent was analyzed.From the single flotation tests,it shows that cationic collectors have a stronger collecting ability for Mycobacterium phlei than anionic collectors.The adsorptive flotation experiment shows that floatability process occurred within 10 minutes,the recovery of Mycobacterium phlei and the removing rate of Pb2+ are high by using cationic collectors during pH value from 4 to 7.At 45mmol/L of Di-buty lamine as collector,and 4.75 of pH,the recovery of Mycobacterium phlei and the removing rate of Pb2+ are 92% and 98%.The isoelectric point of Mycobacterium phlei is 3.09 at pH of the solution,which increased when Pb2+ or Di-buty lamine is adsorption by Mycobacterium phlei.The good floatability of Mycobacterium phlei with cationic collectors results from the intense zeta potential on the surface of cell,Adsorptive flotation may have practical applications for the removal of hazardous metals from contaminated water supplies. |
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