| 沟戈登氏菌对重金属的生物吸附-浮选和解吸性能 |
| 摘要点击 2224 全文点击 1614 投稿时间：2005-05-13 修订日期：2005-08-23 |
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| 中文关键词 捕收剂 沟戈登氏菌 动电位 浮选 生物吸附 解吸 |
| 英文关键词 collector Gordona amarae Zeta potential flotation biosorption desorption |
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| 中文摘要 |
| 用沟戈登氏菌作吸附剂,研究了采用生物吸附-浮选和解吸法从水溶液中去除和回收重金属的过程,并对生物吸附浮选机理进行了分析.结果表明,沟戈登氏菌对各种重金属离子的选择性为Hg>Pb>Cu,但菌细胞对Cu的吸附能力最高.NH4+的加入对吸附Pb2+有促进作用,而K+、Na+、Ca2+和Mg2+共存离子的加入会对吸附过程有明显的抑制.当加入DA17.5mmol/L,pH为9.5时,Pb2+和菌细胞的去除率分别能够达到93%和96%,经无水Na2CO3的3次吸附、浮选和解吸处理后,它们的去除率仍然能够达到94%和97%.动电位和红外光谱分析结果表明,沟戈登氏菌的自然等电点为3.50,吸附Pb2+后增为4.02,与DA作用后降至3.02,吸附过程与细胞壁上的羧酸基团和乙酰胺基团有关,浮选过程则是有静电力、氢键、离子交换和化学络合等过程的协同作用.扫描电镜观察显示,吸附Hg2+后,菌细胞表明粘附有絮状物,菌体形状变得不规则. |
| 英文摘要 |
| The process of adsorptive-flotation and desorption to remove and recovery heavy metals from aqueous solution was studied using Gordona amarae as sorbent,and the mechanisms of biosorption and flotation were analyzed.Experimental results showed that the selectivity of Gordona amarae for various heavy metal cations was Pb>Hg>Cu,and the restrain oneself of Cu2+ was the highest.the present of NH4+ ion on loaded Pb2+ cells was remarkably improved,however,K+、Na+、Ca2+、Mg2+ of co-existing ions slightly restrained influence.The flotation recoveries respectively of Pb2+ and biomass more than 93%and 96%for with DA dosage of 17.5mmol/L in the pH of 9.5,and that was almost quantitative remaining around 94%and 97%being desorbed when desorption frequence of Na2CO3 was up to three times.The measure of Zeta potential and infrared spectroscopy analysis showed that the ioselectric point of Gordona amarae in water was 3.50,up to 4.02 when loaded Pb2+,down to 3.02 when DA doseage added in the loaded biomass.Experiments indicated the lead bosorpting process was likely to involving in the group of —NHCOCH3 and COO-on the cell wall,while the biosorptive flotation was concerned cooperatively to be basing on electrostatic attraction,hydrogen bond,ion exchange and chemical complexation.SEM observation showed that Gordona amarae biomass loaded Hg2+ changed into flocculent matter. |
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