载活性炭负载纳米零价铁/铜双金属颗粒同时吸附和降解γ-六氯环己烷。
Simultaneous adsorption and degradation of γ-HCH by nZVI/Cu bimetallic nanoparticles with activated carbon support.
机构信息
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
出版信息
Environ Pollut. 2011 Oct;159(10):2507-14. doi: 10.1016/j.envpol.2011.06.021. Epub 2011 Jul 16.
Cu amended zero valent iron bimetallic nanoparticles were synthesized by doping Cu on the surface of iron. They were incorporated with granular activated carbon (AC) to prepare supported particles (AC-Fe(0)-Cu), which were used to remove γ-HCH. Cu on the surface of iron enhanced the dechlorination activity of Fe(0). The dechlorination rate constant (k(obs)) increased with the Cu loading on the surface of iron and the maximum was achieved with 6.073% Cu. AC as a support was effective for increasing the dispersion of the nanoparticles and avoiding the agglomeration of the metallic nanoparticles. The simultaneous adsorption of γ-HCH on AC accelerated the degradation rate of γ-HCH by the bimetals. After reaction for 165 min, around 99% of γ-HCH was removed by the solids of AC-Fe(0)-Cu. In addition, AC could adsorb the degradation products. The degradation of γ-HCH was mainly through dehydrochlorination and dichloroelmination based on the intermediate products detected by GC/MS.
采用共沉淀法在铁粉表面掺杂铜合成了铜改性零价铁双金属纳米颗粒，将其负载于颗粒状活性炭（AC）上制得负载型颗粒（AC-Fe(0)-Cu），用于去除γ-六氯环己烷（γ-HCH）。铁表面的铜增强了零价铁的脱氯活性。随着铁表面铜负载量的增加，脱氯速率常数（k(obs)）增加，当铜负载量为 6.073%时达到最大值。AC 作为载体可有效提高纳米颗粒的分散性，避免金属纳米颗粒的团聚。γ-HCH 在 AC 上的同时吸附加速了双金属对 γ-HCH 的降解速率。反应 165 min 后，AC-Fe(0)-Cu 固体去除了约 99%的 γ-HCH。此外，AC 还可以吸附降解产物。通过 GC/MS 检测到的中间产物，γ-HCH 的降解主要通过脱氯化氢和二氯消除进行。
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