1. Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;
2. Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;
3. School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China;
4. College of Food and Biological Engineering, Jimei University, Xiamen 361021, China
Silver nanoparticles (AgNPs) were obtained from the reduction of silver nitrate by sodium borohydride in the stabilizing agent of polyvinyl alcohol (PVA). The as-prepared AgNPs demonstrated an excellent property of dispersibility, with the nanoparticle size of (14±3) nm. The AgNPs were used to investigate the effect of silver nanoparticles on phosphorus uptake and release of phosphorus-accumulating bacteria (PAB) and toxic effect. The results showed that 7mg/L of AgNPs totally inhibited the growth of PAB (P <0.01), and 10mg/L of AgNPs completely suppressed the phosphorus uptake ability of PAB under aerobic condition (P=0.01). Under the anaerobic condition, AgNPs with concentration higher than 20mg/L only partly inhibited the phosphorus release of PAB (P <0.05). The results indicated that AgNPs decreased the ROS level of PAB, and made the partial collapse of bacteria surface structure by the SEM. These revealed that AgNPs can decrease the ROS of bacteria besides the direct effect on the bacteria surface membrane structure, which both might be the important reasons for AgNPs toxicity on PAB.
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