Engineering School of Sustainable Infrastructure and Environment, Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA.
J Hazard Mater. 2014 Jul 15;276:408-14. doi: 10.1016/j.jhazmat.2014.05.054. Epub 2014 May 27.
Batch experiments were conducted to investigate the interactions between metallic iron particles and mercury (Hg) dissolved in aqueous solutions. The effect of bulk zero valent iron (ZVI) particles was tested by use of (i) granular iron and (ii) iron particles with diameters in the nano-size range and referred to herein as nZVI. The results show that the interactions between Hg(n+) and Fe(0) are dominated by Hg volatilization and Hg adsorption; with Hg adsorption being the main pathway for Hg removal from solution. Hg adsorption kinetic studies using ZVI and nZVI resulted in higher rate constants (k) for nZVI when k values were expressed as a function of mass of iron used (day(-1)g(-1)). In contrast, ZVI showed higher rates of Hg removal from solution when k values were expressed as a function iron particles' specific surface area (gm(-2)day(-1)). Overall, nZVI particles had a higher maximum sorption capacity for Hg than ZVI, and appeared to be an efficient adsorbent for Hg dissolved in aqueous solutions.
进行了批实验，以研究溶解在水溶液中的金属铁颗粒与汞（Hg）之间的相互作用。通过使用（i）颗粒状铁和（ii）纳米尺寸范围内的铁颗粒来测试体零价铁（ZVI）颗粒的作用，本文中将其称为 nZVI。结果表明，Hg（n+）与 Fe（0）之间的相互作用主要由 Hg 的挥发和 Hg 的吸附控制；Hg 的吸附是溶液中 Hg 去除的主要途径。使用 ZVI 和 nZVI 进行 Hg 吸附动力学研究时，当 k 值表示为使用的铁质量的函数（day(-1)g(-1)）时，nZVI 的速率常数（k）更高。相比之下，当 k 值表示为铁颗粒比表面积的函数（gm(-2)day(-1)）时，ZVI 从溶液中去除 Hg 的速率更高。总体而言，nZVI 颗粒对 Hg 的最大吸附容量高于 ZVI，并且似乎是溶解在水溶液中的 Hg 的有效吸附剂。
