Acta Chim. Sinica ›› 2017, Vol. 75 ›› Issue (6): 629-636.DOI: 10.6023/A17010018 Previous Articles     Next Articles

Special Issue: 铁环境化学

Article

天然有机质在生物炭负载纳米镍铁降解十溴联苯醚过程中的影响作用机理辨识

易云强a,b,c, 吴娟a,b,c, 方战强a,b,c   

  1. a 华南师范大学 化学与环境学院 广州 510006;
    b 广东省水环境生态治理与修复工程技术研究中心 广州 510006;
    c 广东高校城市水环境生态治理与修复工程技术研究中心 广州 510006
  • 收稿日期:2017-02-14 出版日期:2017-06-15 发布日期:2017-04-01
  • 通讯作者: 方战强 E-mail:sunmoon124@163.com;zhqfang@scnu.edu.cn
  • 基金资助:

    项目受NSFC-广东联合基金(No.U1401235)资助.

Identification Influence Mechanism of Humic Acid in the Degradation of Decabromodiphenyl Ether by the BC@Ni/Fe Nanoparticles

Yi Yunqianga,b,c, Wu Juana,b,c, Fang Zhanqianga,b,c   

  1. a School of Chemistry and Environment, South China Normal University, Guangzhou 510006;
    b Guangdong Technology Research Centre for Ecological Management and Remediation of Water System, Guangzhou 510006;
    c Guangdong Technology Research Centre for Ecological Management and Remediation of Urban Water System, Guangzhou 510006
  • Received:2017-02-14 Online:2017-06-15 Published:2017-04-01
  • Contact: 10.6023/A17010018 E-mail:sunmoon124@163.com;zhqfang@scnu.edu.cn
  • Supported by:

    Project supported by Joint Foundation of NSFC-Guangdong Province (Grant No. U1401235).

The influence mechanism of natural organic matter (NOM) on the removal of contaminant by iron-based nanomaterials remains controversial. In this study, the effect of humic acid (representing NOM) on the degradation of decabromodiphenyl ether (BDE209) by biochar supported Ni/Fe nanoparticles (BC@Ni/Fe) were investigated, which indicated that the removal of BDE209 by BC@Ni/Fe was inhibited in the presence of HA, and with the increase of HA concentration, the inhibitory effect showed more significant. The interaction between HA and BC@Ni/Fe shown that HA was quickly adsorbed on the BC@Ni/Fe. The results of the Zeta potential and sedimentation experiment of BC@Ni/Fe showed that the stability and surface charge of BC@Ni/Fe were effectively improved with the increase of HA concentration, indicating that the inhibitory effect of HA in the debromination of BDE209 by BC@Ni/Fe was not through inhibiting the performance of nanoparticles by HA. The corrosion capacity of BC@Ni/Fe decreased with the increase of HA, which did positively correlate with the effect of HA on the reactivity of BC@Ni/Fe in the removal of BDE209. Additionally, those typical quinone compounds in HA (lawsone and AQDS), which have the electron transfer function, did not serve as an electron transfer medium to directly participating in the reaction process, on the contrary, those compounds did adversely effect on the removal of BDE209. In the coexisting system of HA and BDE209, the equilibrium adsorption capacity of HA on BC@Ni/Fe was 4.75 mg/g. Conversely, the adsorption quantities of BDE209 on BC@Ni/Fe in the absence of HA was 0.31 mg/g, which was about 1.3 times higher than that of in the presence of HA (the adsorption quantities of BDE209 was 0.23 mg/g). Moreover, in the coexistent system of HA and BDE209, the kinetic rate constants for the adsorption of HA was 0.1854 min-1, which was approximately 45 times greater than that of BDE209 (0.0041 min-1). It was shown from the analyzed results that the adsorption rate of HA on BC@Ni/Fe was much greater than that of BDE209. Therefore, that is to say, HA could be preferentially adsorbed onto the surface of BC@Ni/Fe. The adsorbed HA coated on the surface of BC@Ni/Fe occupied the active sites, which hindered the nanoparticles to contact with H2O, reduced the corrosion of Fe0, thus inhibited the removal of BDE209.

Key words: natural organic matter, nanoscale zero valent iron, BC@Ni/Fe, decabromodiphenyl ether, influence mechanism