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Effect of total aluminum concentration on the formation and transformation of nanosized Al_(13) and Al_(30) in hydrolytic polymeric aluminum aqueous solutions

机译:总铝浓度对水解聚合铝水溶液中纳米Al_(13)和Al_(30)形成和转变的影响

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Influence of total aluminum concentration (C_(Al_T)) on the generation and transformation of nanosized Al_(13) and Al_(30) in hydrolytic polyaluminum aqueous solutions was investigated using high field ~(27)Al NMR and time-developed Al-Ferron complex colorimetry. When prepared at the optimal basicity (B) of Al_(13) generation and 80 deg C, the Al_(13) species in polyaluminum solution tends to further polymerize and convert to Al_(30) and higher polymers when C_(Al_T)>0.2 mol.L~(-1), but Al_(13) does not convert to Al_(30) quantificationally, as the formation of Al_u from Al_(13) and Al_(30) is accelerated in the same way. The conversion rate of Al_(13) is accelerated by the increase in C_(Al_T). When C_(Al_T)>0.75 mol.L~(-1), Al_(13) content decreases rapidly, and Al_(30) content increases continuously and becomes the dominant nanometer polynuclear aluminum species. Al_m is one of prerequisites of Al_(13) conversion to Al_(30). When C_(AI_T) increases and B reduces, the polymerization rate between Al_(13) and Al_m increases, and at the same time, the dissociation reaction rate of Al_(13) and Al_(30) by H~+ also increases. The latter becomes the dominant reaction in polyaluminum solution with low B value, so Al_(30) decreases with the increasing C_(Al_T). The hydrolytic polyaluminum solution with Al_(13) content beyond 80 percent can only be prepared under the condition of C_(Al_T)<0.5 mol.L~(-1) and optimal B value.
机译:利用高场〜(27)Al NMR和时间发达的Al-Ferron研究了总铝浓度(C_(Al_T))对水解多铝水溶液中纳米Al_(13)和Al_(30)的生成和转化的影响复杂的比色法。当以Al_(13)生成和80摄氏度的最佳碱度(B)进行制备时,当C_(Al_T)> 0.2时,多铝溶液中的Al_(13)物质趋于进一步聚合并转化为Al_(30)和更高的聚合物摩尔L〜(-1),但是Al_(13)不能定量地转化为Al_(30),因为由Al_(13)和Al_(30)形成Al_u的方式相同。 C_(Al_T)的增加加速了Al_(13)的转化率。当C_(Al_T)> 0.75 mol.L〜(-1)时,Al_(13)含量迅速降低,而Al_(30)含量持续增加,成为主要的纳米多核铝种。 Al_m是将Al_(13)转换为Al_(30)的先决条件之一。当C_(AI_T)增加而B减少时,Al_(13)和Al_m之间的聚合速率增加,并且同时,H_ +引起的Al_(13)和Al_(30)的离解反应速率也增加。后者成为低B值的多铝溶液中的主要反应,因此Al_(30)随着C_(Al_T)的增加而降低。 Al_(13)含量超过80%的水解多铝溶液只能在C_(Al_T)<0.5 mol.L〜(-1)和最佳B值的条件下制备。

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