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以含钙聚合铝(PACCa)作为导向剂与铝源,在常温常压下合成了微/纳结构(微米/纳米尺度)的弗雷德盐。当水溶液中的ρ(Cu2+)为4.406 mg/L时,每升含铜溶液投入0.45 g弗雷德盐对Cu2+的去除率为99.02%。背散射(BEI)与二次电子(SEI)的SEM研究表明:微/纳结构的弗雷德盐在水处理中经历了溶解-结晶过程,XRD鉴定证实弗雷德盐分解后形成方解石晶体与无定形氧化铝。微/纳结构的弗雷德盐去除Cu2+的絮凝沉淀机理与吸附反应模式有所不同,弗雷德盐在絮凝过程中与水中CO2作用转变成方解石与无定形氧化铝,同时Cu2+在碱性环境下生成氢氧化物,新生成的无定型氢氧化铝迅速吸附铜的氢氧化物并裹挟方解石沉淀。
In the presence of PACCa as the directing agent and aluminum source, the Freund salt with micro / nano structure (micrometer / nanometer scale) was synthesized at normal temperature and pressure. When ρ (Cu2 +) in aqueous solution was 4.406 mg / L, the removal rate of Cu2 + was 99.02% when 0.45 g of Fred salt was added per liter of copper-containing solution. SEM studies of backscattering (BEI) and secondary electron (SEI) show that the Friedel’s salt in the micro / nano structure undergoes a solution-crystallization process during water treatment. The XRD results confirm that the dissolution of the calcite crystals Amorphous alumina. The flocculation and sedimentation mechanism of Cu2 + in the micro / nano-structure of Fred salt is different from that of the adsorption reaction mode. In the flocculation process, the salt of Fred salt changes into calcite and amorphous alumina while the Cu2 + Under the formation of hydroxides, the newly formed amorphous aluminum hydroxide rapid adsorption of copper hydroxide and host calcite precipitation.