School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China.
Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou, 510006, China.
Environ Sci Pollut Res Int. 2019 Apr;26(10):10136-10147. doi: 10.1007/s11356-019-04403-y. Epub 2019 Feb 12.
The removal of contaminants by iron-based nanomaterials was inevitably affected by the natural organic matter (NOM), which is one of the most abundant material on earth and exists in natural waters. This study was performed to investigate the main influence of humic acid (HA, representing NOM) on the behavior and reactivity of Ni/Fe nanoparticles in the removal of deca-brominated diphenyl ether (BDE209). Generally, the inhibitory effect of HA on the removal of BDE209 by Ni/Fe showed greater significance with an increase of HA concentration. The zeta potential and sedimentation experiments showed that the HA enhanced the dispersion and stabilization of Ni/Fe particles; however, the removal of BDE209 was found to be inhibited. Moreover, the corrosion capacity of the Ni/Fe nanoparticles showed a positive correlation with the effect of HA on the reactivity of Ni/Fe nanoparticles. Meanwhile, typical quinone compounds in HA had an adverse effect on the removal of BDE209. Additionally, the competitive adsorption experiments and characterization illustrated that the adsorption of HA by Ni/Fe nanoparticles was superior to BDE209. Overall, it was proposed that the corrosion of Ni/Fe was reduced as the contact between the nanoparticles and HO was hindered due to the surface of Ni/Fe was occupied by the adsorbed HA, and thus inhibited the reactivity of Ni/Fe nanoparticles in the removal of BDE209.
铁基纳米材料去除污染物不可避免地会受到天然有机物 (NOM) 的影响，NOM 是地球上最丰富的物质之一，存在于天然水中。本研究旨在探讨腐殖酸 (HA，代表 NOM) 对 Ni/Fe 纳米颗粒去除十溴二苯醚 (BDE209) 行为和反应性的主要影响。一般来说，随着 HA 浓度的增加，HA 对 Ni/Fe 去除 BDE209 的抑制作用更为显著。Zeta 电位和沉降实验表明，HA 增强了 Ni/Fe 颗粒的分散和稳定性；然而，发现 BDE209 的去除受到抑制。此外，Ni/Fe 纳米颗粒的腐蚀能力与 HA 对 Ni/Fe 纳米颗粒反应性的影响呈正相关。同时，HA 中的典型醌类化合物对 BDE209 的去除有不利影响。此外，竞争吸附实验和表征表明，HA 通过 Ni/Fe 纳米颗粒的吸附优于 BDE209。总体而言，提出由于 Ni/Fe 表面被吸附的 HA 占据，阻碍了纳米颗粒与 HO 的接触，从而降低了 Ni/Fe 的腐蚀，抑制了 Ni/Fe 纳米颗粒去除 BDE209 的反应性。
