College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
J Hazard Mater. 2015 Mar 21;285:236-44. doi: 10.1016/j.jhazmat.2014.12.003. Epub 2014 Dec 5.
Despite the knowledge about increasing discharge of silver nanoparticles (AgNPs) into wastewater and its potential toxicity to microorganisms, the interaction of AgNPs with heavy metals in the biological removal process remains poorly understood. This study focused on the effect of AgNPs (hydrodynamic diameter about 24.3±0.37 nm) on the removal of cadmium (Cd(II)) by using a model white rot fungus species, Phanerochaete chrysosporium. Results showed that the biological removal capacity of Cd(II) increased with the concentration of AgNPs increasing from 0.1 mg/L to 1 mg/L. The maximum removal capacity (4.67 mg/g) was located at 1 mg/L AgNPs, and then decreased with further increasing AgNPs concentration, suggesting that an appropriate concentration of AgNPs has a stimulating effect on the removal of Cd(II) by P. chrysosporium instead of an inhibitory effect. Results of Ag(+) and total Ag concentrations in the solutions together with those of SEM and XRD demonstrated that added AgNPs had undergone oxidative dissolution and transported from the solution to the surface of fungal mycelia (up to 94%). FTIR spectra confirmed that amino, carboxyl, hydroxyl, and other reducing functional groups were involved in Cd(II) removal, AgNPs transportation, and the reduction of Ag(+) to AgNPs.
尽管人们已经了解到越来越多的银纳米粒子（AgNPs）被排放到废水中，并且它们对微生物具有潜在的毒性，但 AgNPs 与重金属在生物去除过程中的相互作用仍知之甚少。本研究关注的是银纳米粒子（水动力直径约为 24.3±0.37nm）对用模型白腐真菌糙皮侧耳（Phanerochaete chrysosporium）去除镉（Cd(II)）的影响。结果表明，随着 AgNPs 浓度从 0.1mg/L 增加到 1mg/L，Cd(II)的生物去除能力增加。在 1mg/L AgNPs 时，最大去除容量（4.67mg/g），然后随着 AgNPs 浓度的进一步增加而降低，这表明适当浓度的 AgNPs 对 P. chrysosporium 去除 Cd(II)具有刺激作用，而不是抑制作用。溶液中 Ag(+)和总 Ag 浓度的结果以及 SEM 和 XRD 的结果表明，添加的 AgNPs 经历了氧化溶解，并从溶液中运送到真菌菌丝体的表面（高达 94%）。FTIR 光谱证实，氨基、羧基、羟基和其他还原官能团参与了 Cd(II)的去除、AgNPs 的运输以及 Ag(+)还原为 AgNPs。
