Chongqing Key Laboratory of Soil Multiscale Interfacial Process, Southwest University, Chongqing 400716, China.
Chongqing Key Laboratory of Soil Multiscale Interfacial Process, Southwest University, Chongqing 400716, China.
Bioresour Technol. 2020 Jan;296:122339. doi: 10.1016/j.biortech.2019.122339. Epub 2019 Nov 11.
Most metal oxide nanoparticles (NPs) can impact ammonium removal, but the underlying mechanism remains unclear. In this study, high doses of NiO, CuO, ZnO and TiO (>1 mg/L) inhibited the ammonium removal performance of Pseudomonas putida Y-9. Interestingly, low levels of CuO NPs (0.1, 0.5 mg/L) and NiO NPs (0.1 mg/L) enhanced ammonium removal efficiency. Moreover, a decrease in Mg levels was significantly positively correlated with ammonium removal efficiency, while negatively correlated with the Ti, Zn, and Cu release of NPs. Further research on effect of NPs and their corresponding cations on ammonium removal revealed that four NPs affected Mg absorption in Y-9 via different routes, thus impacting NH removal efficiency, i.e., the effect of NiO NPs was caused by itself, TiO NPs' impact was solely due to the release Ti, while the influence of CuO NPs and ZnO NPs was based on both the particles and released ions.
大多数金属氧化物纳米颗粒（NPs）会影响铵的去除，但潜在的机制尚不清楚。在这项研究中，高剂量的 NiO、CuO、ZnO 和 TiO（>1mg/L）抑制了 Pseudomonas putida Y-9 的铵去除性能。有趣的是，低浓度的 CuO NPs（0.1、0.5mg/L）和 NiO NPs（0.1mg/L）提高了铵的去除效率。此外，镁水平的降低与铵去除效率呈显著正相关，而与 NPs 的 Ti、Zn 和 Cu 释放呈负相关。进一步研究 NPs 及其相应阳离子对铵去除的影响表明，四种 NPs 通过不同途径影响 Y-9 中的镁吸收，从而影响 NH 的去除效率，即 NiO NPs 的影响是由其自身引起的，TiO NPs 的影响仅归因于 Ti 的释放，而 CuO NPs 和 ZnO NPs 的影响则基于颗粒和释放的离子。
