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本研究以石英砂为载体,在其颗粒表面合成铁胶膜,并探讨合成体系不同初始pH(5,6,7)及铁摩尔比(R=[Fe(Ⅱ)]/[Fe(Ⅲ)])等条件对铁胶膜形成的影响。研究表明,在初始pH相同的情况下,当R为0时,铁胶膜的矿物成分为弱晶质的水铁矿;R为0.01时的矿物成分为赤铁矿;R分别为0.02、0.04、0.06和0.10时为针铁矿,且随着R增加,X射线衍射(XRD)图谱中针铁矿的峰强度逐渐增加,扫描电镜(SEM)可观察到针铁矿晶形逐渐变大,且在R为0.10时晶体形貌最大;当R为0.50和体系只加入Fe(Ⅱ)时合成的铁矿物主要为针铁矿与磁铁矿的混合物。当R一定时,随着合成体系初始pH的增加,胶膜中针铁矿的XRD峰强度逐渐增强,在初始pH为7时其峰最强,且晶形逐渐变大。
In this study, the iron film was synthesized on the surface of quartz particles using quartz sand as carrier, and the effects of different initial pH (5,6,7) and iron molar ratio (R = [Fe (Ⅱ)] / [Fe ]) And other conditions on the iron film formation. The results show that at the same initial pH, when R is 0, the mineral composition of the iron film is weakly crystalline ferrihydrite; when R is 0.01, the mineral composition is hematite; R is respectively 0.02, 0.04 , 0.06 and 0.10, respectively. And with the increase of R, the peak intensity of goethite in X-ray diffraction (XRD) spectra increased gradually, and the shape of goethite crystals gradually increased with scanning electron microscopy When R is 0.10, the crystal morphology is the largest. When R is 0.50 and only Fe (Ⅱ) is added in the system, the synthesized iron minerals are mainly the mixture of goethite and magnetite. When R is constant, the XRD peak intensity of goethite increases gradually with the increase of initial pH of the synthesis system. At the initial pH of 7, the XRD peak intensity is the strongest, and the crystal form becomes larger.