【摘要】 用X射线粉晶衍射分析技术结合热重分析、红外光谱及电镜观察对合成的含钙聚合氯化铝铁(PAFCCa)及其合成前体含钙聚合氯化铝(PACCa)、含钙聚合氯化铁(PFCCa)的低温干燥样进行了表征。XRD衍射结果表明,Ca(Ⅱ)分别与A l(Ⅲ)、Fe(Ⅲ)都能形成结晶化合物,在PACCa中结晶化合物主要是Ca3A l2(OH)12,在PFCCa中结晶化合物主要是Ca4Fe14O25,在PAFCCa中形成A l-Ca-Fe三相结晶化合物铁取代的氯钙矾石结构体,其组成是(Ca6(A l,Fe)2[(OH)4C l2]3.20H2O)。热重分析、红外光谱与电镜观察都支持了XRD的衍射结果。更多还原

【Abstract】 The synthesized calcium-containing polyaluminum ferric chloride(PAFCCa) and its co-aggregating materials calcium-containing polyaluminum chloride(PACCa) and calcium-containing polyferric chloride(PFCCa),characterized by X-ray diffraction(XRD) with thermal analysis(TG-DTG) and Fourier-Transform-Infrared Spectroscopy(FTIR),Transmission and Scan Electron Microscopy coupled with Energy Dispersive Spectroscopy(TEM-EDS,SEM-EDS) on the air-dried samples.The XRD patterns displayed that Ca(Ⅱ) combined with Al(Ⅲ) and Fe(Ⅲ) and formed crystalline phases Ca-Al-hydroxides(Ca3Al2(OH)12),Ca-Fe-oxides(Ca4Fe9O17),and Al-Ca-Fe-hydroxides(Ca2(Al,Fe)2O5) in PAFCCa,respectively.The hydrogrossular structure may be Ca6(Al,Fe)2[(OH)4Cl2]3·20H2O).SEM observations showed that crystals of the air-dried sample with n(Al)/ n(Fe)=3∶7.PAFCCa are large pellets made of smaller granules and crystals in n(Al)/ n(Fe)=7∶3.PAFCCa are hollow tubes of ettringite-like structure,these are regarded as the direct evidence of different species when n(Al)/ n(Fe)>6∶4 or n(Al)/ n(Fe)﹤6∶4 in PAFCCa solutions.The results are supported by TG-DTG and FTIR analyses.更多还原