Park Soo-Jin, Jang Yu-Sin
Advanced Materials Division, Korea Research Institute of Chemical Technology, P.O. Box 107, Yusong, Taejon 305-600, Korea.
J Colloid Interface Sci. 2002 May 15;249(2):458-63. doi: 10.1006/jcis.2002.8269.
Effects of hydrochloric acid and sodium hydroxide treatments of activated carbons (ACs) on chromium(VI) reduction were studied. The surface properties were determined by pH, acid-base values, FT-IR, and X-ray photoelectron spectrometer (XPS). And the porous structure of the activated carbons was characterized by adsorption of N(2)/77 K. The Cr(VI) adsorption experiments were carried out to analyze the influence of porous texture and surface properties changed by the chemical surface treatments of ACs on adsorption rate with carbon-solution contact time. From the experimental results, it was observed that the extent of adsorption and reduction processes depends on both microporous structure and functional groups. And the adsorption of Cr(VI) ion was more effective in the case of acidic treatment on activated carbons, resulting from the increases of acid value (or acidic functional group) of activated carbon surfaces. However, basic treatment on activated carbons was not significantly effective on the adsorption of Cr(VI) ion, probably due to the effects of the decrease of specific surface area and basic Cr(VI) in nature.
研究了用盐酸和氢氧化钠处理活性炭（AC）对六价铬还原的影响。通过pH值、酸碱值、傅里叶变换红外光谱（FT-IR）和X射线光电子能谱仪（XPS）测定表面性质。并用77K下氮气吸附法表征活性炭的多孔结构。进行了六价铬吸附实验，以分析活性炭化学表面处理改变的多孔结构和表面性质对碳-溶液接触时间吸附速率的影响。从实验结果可以看出，吸附和还原过程的程度取决于微孔结构和官能团。活性炭经酸性处理后，六价铬离子的吸附效果更好，这是由于活性炭表面酸值（或酸性官能团）增加所致。然而，活性炭的碱性处理对六价铬离子的吸附效果不显著，这可能是由于比表面积减小和六价铬本身呈碱性的影响。
