摘要
利用从土壤铁锰结核及其附近土壤中分离筛选得到的4株锰氧化菌,研究了不同pH、Mn(Ⅱ)初始浓度下菌株的锰氧化效率及生长情况,并用SEM-EDS及TEM对菌株WHS26、GY16形成的生物氧化锰及水羟锰矿进行了表征.结果表明,pH及Mn(Ⅱ)初始浓度对菌株的锰氧化效率均有影响,4株菌在pH 7~8、Mn(Ⅱ)初始浓度为10~20 mmol·L-1时,锰氧化效率最高;GY16、WHS26形成的生物氧化锰的形貌与化学合成的水羟锰矿存在明显差异,前者呈胶膜状附着在菌株表面,后者呈结晶态.该结果可为生物氧化锰应用于重金属污染修复提供技术支撑.
Four Mn-oxidizing bacteria( WHS26,GY16,LZ2 and LZ4) were isolated from Fe-Mn nodules. The effects of pH and Mn( Ⅱ) concentration on Mn( Ⅱ) oxidation and bacterial growth was investigated,and the structures of biogenic Mn oxides and vernadite were studied by SEM-EDS and TEM.It was indicated that four Mn-oxidizing bacteria oxidized Mn( Ⅱ) the most effectively when p H was adjusted to 7 ~ 8 and Mn( Ⅱ) concentration was 10 ~20 mmol·L- 1. The structures of biogenic Mn oxides and vernadite were very different and biogenic Mn oxides had larger surface area than vernadite. The findings provided fundamental technical support for biogenic manganese oxides application in environmental pollution remediation.
出处
《环境科学学报》
CAS
CSCD
北大核心
2015年第1期262-269,共8页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.41071163,51221892)~~
关键词
生物氧化锰
氧化活性
p
H
底物浓度
电镜
biogenic manganese oxide
oxidative activity
pH
concentration of substrate
electron microscope
