柠檬酸粗化铜离子矿化产物颗粒粒径的研究  

Study on Coarsing Particle Size of Cu^(2+) Biomineralization Products by Citric Acid

作　　者：许燕波[1,2] 钱春香[1,2] 陆兆文[1,2] 

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]东南大学江苏省土木工程材料重点实验室,南京211189

出　　处：《材料导报》2013年第2期92-95,共4页Materials Reports

基　　金：江苏省自然科学基金重点项目(BK2010062)

摘　　要：以Cu2+为例,将柠檬酸用于重金属离子生物矿化过程中的晶体生长调控,通过粗化矿化产物的颗粒粒径,提高了重金属矿化产物在土壤和水体中的稳定性。研究发现,铜离子生物矿化产物颗粒平均粒径为12μm,柠檬酸的掺量为底物质量的0.5%时,矿化产物的平均粒径增加到40μm。研究了不同pH值培养基下的矿化产物粒径。发现当体系pH值提高后,柠檬酸的电离程度提高,对铜离子的络合作用加强,有利于矿化产物的粒径增加。初始pH值调整至8,反应体系pH值为5.21时,铜离子矿化产物平均粒径达到65μm。Critic acid was used to control the crystal growth in the preparation of heavy metal mineralized by bacteria. The stability of products by heavy metal biomineralization in soil and water was enhanced by coarsing the particle size. The mean particle size of products of Cu2＋ mineralized by bacteria is 12μm, while the mean particle size is 40μm with 0. 5%citric acid addian. The particle size under different pH value conditions was investigated. It is indicated that the ef{ect of complexion increased because of the ionization of citric acid by increasing the pH value. When the initial pH value is 8 and the reaction system pH value is 5.21, the mean particle size is 65μm.

关 键 词：生物矿化 重金属 CU2+ 柠檬酸粒径 

分 类 号：TU526[建筑科学—建筑技术科学]