摘要
放射性核素的污染对人类环境危害极大,研究其可行的治理方法具有重要意义,关于微生物与矿物结合去除Sr^(2+)的研究较少。本实验将前期筛选的脱氮硫杆菌与蒙脱石构建菌-矿体系,利用液相离子色谱、多功能X射线衍射仪(XRD)、扫描电镜(SEM)等方法表征体系中pH、SO_(4)^(2-)的变化和蒙脱石-脱氮硫杆菌体系(Mont-TD)对溶液中Sr^(2+)的去除能力和固化能力。结果显示,Mont-TD体系对Sr^(2+)有较高的去除效果,在Sr^(2+)质量浓度为1000 mg/L、150 mL的培养基中加入6 g蒙脱石、体积比1∶100的菌液,30 d后,Sr^(2+)去除率达到93.2%,固化率达到71.1%,产物中产生SrSO_(4)晶体。通过构建Mont-TD体系,实现了对溶液中Sr^(2+)的有效去除,部分Sr^(2+)被稳定固化,蒙脱石-脱氮硫杆菌体系可为治理环境中锶离子污染提供一种思路。
The pollution of radionuclides is extremely harmful to the human environment,and it is of great significance to study its feasible treatment methods.There are few studies on the removal of Sr^(2+)by the combination of microorganisms and minerals.This experiment constructed the bacteria-mineral system with the previously screened thiobacillus denitrificans and montmorillonite,and liquid ion chromatography,multifunctional X-ray diffractometer(XRD),scanning electron microscopy(SEM)and other methods were used to characterize pH and SO_(4)^(2-)changes in the system and the removal ability and curing ability of the montmorillonite-thiobacillus denitrificans system(Mont-TD)on Sr^(2+)in solution.The results show that the Mont-TD system has a high removal effect on Sr^(2+).Adding 6 g montmorillonite and 1∶100 bacterial solution to the medium with Sr^(2+)concentration of 1000 mg/L and 150 mL,after 30 d,the removal rate of Sr^(2+)reaches 93.2%,the solidification rate reaches 71.1%,and SrSO_(4) crystals are produced in the product.By constructing the Mont-TD system,the effective removal of Sr^(2+)in the solution is achieved,and part of it is stably solidified.Montmorillonite-thiobacillus denitrificans system can provide an idea for the treatment of strontium ion pollution in the environment.
作者
代群威
利勇
邬琴琴
赵玉连
王维富
DAI Qun-wei;LI Yong;WU Qin-qin;ZHAO Yu-lian;WANG Wei-fu(School of Environment and Resources,Southwest University of Science and Technology,Mianyang 621010,China;National Defense Key Discipline Laboratory of Nuclear Waste and Environmental Safety,Southwest University of Science and Technology,Mianyang 621010,China;School of Life Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China)
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2023年第6期557-562,I0004,共7页
Journal of Nuclear and Radiochemistry
基金
国家自然科学基金资助项目(41102212)。
