不同污染条件下微生物矿化固结Zn^(2+)的作用及机理  

Function and mechanism of microbial mineralization consolidation of Zn^(2+) under different pollution conditions

作　　者：陆兆文[1,2] 钱春香[1,2] 许燕波[1,2] 王明明[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：《东南大学学报（自然科学版）》2013年第2期365-370,共6页Journal of Southeast University：Natural Science Edition

基　　金：江苏省自然科学基金重点资助项目(BK2010062)

摘　　要：为了探究微生物矿化处理重金属的作用及机理,选取Zn2+溶液进行模拟研究.采用扫描电子显微镜和X射线衍射仪,研究了不同pH值、温度、离子浓度下微生物矿化产物的成分、显微结构及矿化效果,探究了微生物矿化固结重金属离子的作用和机理.实验结果表明,在不同污染条件下反应生成的矿化产物皆为Zn5(OH)6(CO3)2,条件不同时产物结晶效果有区别.溶液为中性或碱性时,结晶较好;pH值较低时,晶体不易成核生长.温度升高,有利于矿化产物的沉积和成型.Zn2+浓度对微生物矿化固结重金属形成矿化产物的影响较小.当Zn2+,Pb2+,Cu2+等混合离子共同存在时,Zn2+与Cu2+固结在一起形成矿化产物,Pb2+单独结晶.In order to study the features of microbial mineralization of heavy metals,the biomineralization experiments were carried out to simulate the heavy-metal contaminated system with Zn2＋.Scanning electron microscopy（SEM） and X-ray diffraction（XRD） were used to study the composition,microstructure and mechanism of microbial mineralization consolidation under different reaction conditions such as pH value,temperature and ionic concentration.The experimental results show that under different pollution conditions,all the products of mineralization are Zn5（OH）6（CO3）2 while the crystallization effects are different.Neutral or alkali solution is conducive to grain＇s nucleation while acidity is not.The increase of the temperature is good for the deposition and formation of mineralization product.Furthermore,the concentration of Zn2＋ has little influence on mineralization consolidation.In the mixed-ion system of Pb2＋,Cu2＋ and Zn2＋,Zn2＋ and Cu2＋can be consolidated together while Pb2＋ is crystallized alone.

关 键 词：微生物 碱式碳酸锌 碳酸盐矿化菌 酶化 

分 类 号：X53[环境科学与工程—环境工程]