利用水泥基材料铝酸三钙（ C3 A）水化过程中可形成层状双羟基氢氧化物（ LDHs）的特性，研究了C3 A对水溶液中Zn2＋的去除效果及机制，并探索了pH、温度对Zn2＋去除效果的影响．结果表明，室温下，未调节溶液pH时， C3 A对废水中Zn2＋的最大去除量可达13．7 mmol·g－1；此外，C3 A对Zn2＋的去除量随反应时间及Zn2＋初始浓度的增加而增大，随后去除量不再变化；在pH值为3—7时，C3 A对Zn2＋的去除量随pH的升高而增加；在25—35℃范围内Zn2＋的去除量随温度的升高而增加，在35－55℃范围内Zn2＋的去除量随温度的升高反而下降．采用X射线衍射（ XRD）、红外（ FT?IR）及扫描电镜（ SEM）等微观分析手段表明反应固体产物为ZnAl?LDH．结合反应平衡后溶液组分分析表明，原位即时形成的ZnAl?LDH是通过C3 A水化过程中形成的CaAl?LDH与Zn2＋发生阳离子交换反应与共沉淀反应协同所致．
Based on the property of tricalcium aluminate ( C3A), an important constituent of cements, in forming layered double hydroxides ( LDHs) during the hydration process of C3 A, the removal efficiency and mechamism of Zn2+ by C3 A were investigated. The results showed that zinc removal by C3 A reached 13. 7 mmol·g-1 at 25 ℃, with no adjustment of pH. In addition, Zn2+removal increased with the reaction time and initial Zn2+ concentration, and finally reached adsorption equilibrium. The amount of removed zinc increased in the pH range of 3—7, and also increased with the temperature from 25 to 35 ℃, but decreased from 35 ℃ to 55 ℃. X?ray diffraction ( XRD) , Fourier transform infrared ( FT?IR) and scanning electron microscopy ( SEM) analysis suggest the solid product was Zn Al?LDH. Combined with the solution component analysis, it was revealed that the in?situ production of ZnAl?LDH was obtained mainly via cation exchange between Zn2+and Ca2+on the main layers of CaAl?LDH as well as Zn2+precipitation with Al( OH)-4 . C3 A can be potentially used as a cost?effective material for the removal of zinc from aqueous solutions.
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