K_2FeO_4的合成及对含苯酚水溶液中重金属离子的去除性能（英文）

Synthesis of K_2FeO_4 for Removing Heavy Metals in the Phenol-Aqueous Solution

以次氯酸钙和九水硝酸铁为原料采用湿化学法合成K_2FeO_4,X射线衍射(XRD)、扫描电子显微镜(SEM)、红外吸收光谱(FTIR)、能量色散谱(EDS)的对比分析表明通过二次重结晶纯化可有效去除粗产品中的杂质,获得纯度更高、晶形更完整的K_2FeO_4晶体。同时研究了K_2FeO_4投加量、时间、溶液pH值、温度、初始离子浓度等因素下,K_2FeO_4对含苯酚水溶液中的Cu髤、Cd髤的去除性能,并通过扫描电子显微分析(SEM)、能量色散谱(EDS)、红外吸收光谱(FTIR)等方法研究了K_2FeO_4对溶液中重金属离子的去除机理。实验结果表明:K_2FeO_4可通过一步反应同时去除溶液中的Cu髤、Cd髤以及苯酚,K_2FeO_4主要通过吸附、共沉淀和表面配位的方式去除溶液中的重金属离子。

K2FeO4 was synthesized by wet chemical method with calcium hypochlorite and iron nitrate nonahydrate as raw material. The contrative analysis from X ray diffraction（XRD）, scanning electron microscope（SEM）, infrared absorption spectrometer（FTIR） and energy dispersive spectrometer（EDS） show that higher purity and more uniform K2FeO4 crystals can be obtained by second recrystallized purification from crude products. Several experiments were performed to investigate the removal properties of K2FeO4 on Cu（Ⅱ） and Cd（Ⅱ） ions in the phenol-aqueous solution, including dosage of K2FeO4, shock time, solution pH, shock temperature, initial concentration and mixed ions. The K2FeO4 can remove Cu（Ⅱ）, Cd（Ⅱ） and degrade phenol from phenol-aqueous solution in a single step of treatment. In addition, the removal mechanisms of metal ions including of adsorption, co-precipitate and surface complexation were revealed by scanning electron microscope （SEM）, energy dispersive spectrometer （EDS）, fourier transform infrared absorption spectrum （FTIR） in detail. The research results can provide a water treatment agent, which may be used to treat wastewater containing heavy metal and organic matter.