Key Laboratory of Ion Beam Bio-Engineering, Institute of Biotechnology and Agriculture Engineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, China.
Environ Sci Technol. 2011 Sep 15;45(18):7841-7. doi: 10.1021/es201680m. Epub 2011 Aug 17.
Aqueous chromium(VI) reduction and removal induced by glow discharge taking place at the gas-solution interface in an argon atmosphere was studied. The effect of initial pH and hydroxyl radical scavenger (ethanol) on the reduction efficiency was examined. High reduction efficiency was obtained when initial pH ≤ 2.0 or ≥ 8.0. In particular, addition of ethanol into the solution substantially increased the reduction efficiency and facilitated chromium removal from the solution in the form of sediment after discharge. The optimum pH values for Cr(VI) removal were within 6.0-7.0. Fourier transform-infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analysis confirmed that the main constituent of the sediment is chromium hydroxide.
研究了在氩气气氛中，发生在气-液界面的辉光放电引发的六价铬的还原和去除。考察了初始 pH 值和羟基自由基清除剂（乙醇）对还原效率的影响。当初始 pH 值≤2.0 或≥8.0 时，可获得较高的还原效率。特别地，向溶液中添加乙醇可大大提高还原效率，并有利于放电后以沉淀的形式从溶液中去除铬。Cr(VI)去除的最佳 pH 值在 6.0-7.0 之间。傅里叶变换红外（FTIR）光谱和 X 射线衍射（XRD）分析证实，沉淀的主要成分是氢氧化铬。
