Lu Xixin, Huangfu Xiaoliu, Zhang Xiang, Wang Yaan, Ma Jun
State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China E-mail:
J Water Health. 2015 Jun;13(2):383-93. doi: 10.2166/wh.2014.156.
Removal of trace mercury from aqueous solution by Mn (hydr)oxides formed in situ during coagulation with poly-aluminum chloride (PAC) (in situ MnO(x) combined with PAC) was investigated. The efficiency of trace mercury removal was evaluated under the experimental conditions of reaction time, Mn dosage, pH, and temperature. In addition, the ionic strength and the initial mercury concentration were examined to evaluate trace mercury removal for different water qualities. The results clearly demonstrated that in situ MnO(x) combined with PAC was effective for trace mercury removal from aqueous solution. A mercury removal ratio of 9.7 μg Hg/mg Mn was obtained at pH 3. Furthermore, at an initial mercury concentration of 30 μg/L and pH levels of both 3 and 5, a Mn dosage of 4 mg/L was able to lower the mercury concentration to meet the standards for drinking water quality at less than 1 μg/L. Analysis by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy suggests that the hydroxyls on the surface of Mn (hydr)oxides are the active sites for adsorption of trace mercury from aqueous solution.
研究了在与聚合氯化铝（PAC）混凝过程中原位形成的Mn（氢）氧化物（原位MnO(x)与PAC结合）从水溶液中去除痕量汞的情况。在反应时间、锰用量、pH值和温度等实验条件下评估了痕量汞的去除效率。此外，还考察了离子强度和初始汞浓度，以评估不同水质下痕量汞的去除情况。结果清楚地表明，原位MnO(x)与PAC结合对从水溶液中去除痕量汞是有效的。在pH为3时，汞的去除率为9.7 μg Hg/mg Mn。此外，在初始汞浓度为30 μg/L且pH值为3和5的情况下，4 mg/L的锰用量能够将汞浓度降低至低于1 μg/L，达到饮用水水质标准。傅里叶变换红外光谱和X射线光电子能谱分析表明，Mn（氢）氧化物表面的羟基是从水溶液中吸附痕量汞的活性位点。
