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微生物对Ag和Ag2S纳米颗粒的全面反应以及在建筑湿地中的银的空间分布

Chong Cao¹, Zi Heng Ding¹, Juan Huang²

¹Department of Municipal Engineering, College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.

The Science of the total environment

|October 11, 2023

概括

银纳米粒子和离子对构建的湿地细菌和去除产生影响. 建筑湿地有效地去除银,但纳米颗粒可以很容易地通过基板层转移.

科学领域:

环境科学环境科学
环境化学环境化学
环境微生物学环境微生物学

背景情况:

建筑湿地 (CWs) 是用于废水处理的工程系统.
银纳米粒子 (Ag NPs) 和离子 (Ag+) 是具有潜在生态影响的新兴污染物.
了解银在CW中的命运和影响对于可持续的水资源管理至关重要.

研究的目的:

研究AgNP,Ag2SNP和Ag+对微生物群落,代谢和CW中的银分布的影响.
评估CW中银污染物的去除效率和转移.
确定银如何影响去除过程的机制.

主要方法:

在CW中暴露于AgNP,Ag2SNP和Ag+,持续155天.
对微生物物种丰富度,多样性和代谢基因 (nrfA,norB,napA,nxrA,nirA) 的分析.
测量银度和计算转位因子 (TFs).

主要成果:

AgNP和Ag2SNP改变了物种丰富性和多样性;Ag+增加了多样性指数.
银污染物通过影响酶活性和降低关键相关基因的调节来抑制代谢.
AgNP主要抑制了酸盐的去除,而Ag+抑制了氨的去除.
电力压力机实现了高的清除率 (约. 98%) 的银污染物.
纳米粒子表现出更高的转位因子,表明通过CW基板更容易移动.

结论:

银污染物,包括纳米粒子和离子,显著损害了CW中的去除功能.
虽然CW有效地去除银,但纳米粒子转移的潜力需要进一步考虑.
该研究强调了各种银形式对CW中循环和微生物群落的差异性影响.

关键词:

建造的湿地建造的湿地功能性细菌是一种功能性细菌.的新陈代谢的新陈代谢银纳米颗粒银纳米粒子空间分布的空间分布

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