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采用蟹壳粉（100目）作为吸附剂，对牡蛎水解液中的Cd2+、Cr2+、Pb2+以及As等重金属离子进行了静态和动态吸附试验，分别从蟹壳粉投加量、溶液初始pH值、脱除震荡时间等方面对蟹壳粉的吸附性能进行了研究。试验结果表明，蟹壳粉对于牡蛎水解液中的重金属离子吸附性能良好，脱除率均能达到50%左右。在溶液初始pH分别为5,5,4,6时，蟹壳粉对Cd2+、Pb2+、Cr2+、As的脱除效果最好，脱除率分别为74.95%，69.53%，54.51%和95.95%。蟹壳对Cd2+、Cr2+、Pb2+以及As的吸附符合Langmuir吸附等温模型。获得的动力学数据表明，金属吸附速度快，当吸附时间超过60min后，吸附较慢，当吸附到达240min时，吸附趋于完成。较高的相关系数符合Ho Y S 二级吸附动力学模型。 关键词：蟹壳粉 重金属 铬 镉 铅 砷 脱除率 吸附量 |
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jingjing1005
木虫 (小有名气)
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wypward(金币+1):欢迎新虫，谢谢参与 2010-06-03 17:35:26
kitten311(金币+20, 翻译EPI+1):嗷嗷感动啊~~ 2010-06-04 21:38:00
kitten311(金币+35): 2010-06-06 21:57:10
wypward(金币+1):欢迎新虫，谢谢参与 2010-06-03 17:35:26
kitten311(金币+20, 翻译EPI+1):嗷嗷感动啊~~ 2010-06-04 21:38:00
kitten311(金币+35): 2010-06-06 21:57:10
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Static and dynamic adsorption experiments were performed to the Cd2 +, Cr2 +, Pb2 + and other heavy metal ions in the hydrolysis of oysters with crab shell powder (100 mesh) as adsorbent to study the impacts of crab shell powder dosage, initial pH value of solution and time for shock removal on absorption properties of crab shell powder. The results showed that crab shell powder had strong ability of adsorbing heavy metal ions in the hydrolysis of oysters and the removal rate can reach 50%. Best removal effect reached at the Initial pH in the solution of 5,5,4,6 respectively, in particular for the ions of Cd2 +, Pb2 +, Cr2 +, and the removal rate for each of the four was 74.95%, 69.53%, 54.51% and 95.95% respectively . The adsorption of crab shell powder for Cd2 +, Cr2 +, Pb2 + conformed to the Langmuir isotherm model. The kinetic data obtained showed that the metal adsorption was at high speed, but it slowed down after 60min and finished at 240min. The absorption coincided with Ho YS 2 adsorption kinetic model with high correlation coefficient. Keywords: crab shell powder, heavy metal, Cr, Cd, Pb, As, removal rate, absorption dosage |
2楼2010-06-03 16:48:01