多层状碱式碳酸锌微晶的制备及其脱除Cu^(2+)性能研究

Synthesis of Multilayered Zinc Carbonate Hydroxide Microcrystals and Its Removal Cu^(2+) Properties

以壳聚糖(CS)为生物模板,采用低温水热法成功制备出了多层状碱式碳酸锌(ZCHO)微晶。采用XRD、SEM和TG等手段对产物的结构、形态和热学性能进行了表征,结果表明,单个ZCHO微晶颗粒均是由许多ZCHO纳米片构成的。添加适量的CS对形成多层状ZCHO微晶起到了至关重要的作用。热重分析结果表明,CS辅助得到的碳酸锌微晶热稳定性较高。等温吸附实验表明,在室温下,多层状ZCHO微晶能有效脱除水体中的Cu2+,去除量与浓度关系符合Freundlich模型。最后讨论了多层状ZCHO微晶大容量去除Cu2+的可能机理。

Multilayered zinc carbonate hydroxide microcrystals(ZCHO)were prepared by hydrothermal method assisted chitosan(CS)templates.The as-prepared products were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and thermogravimetric analysis(TG).Results indicate that every ZCHO microcrystal had a multi-layered structure and was composed of many ZCHO nanoplates.The used CS played vital roles in the formation of multi-layered ZCHO microcrystals.TG measurements had further indicated that CS-assisted zinc carbonate microcrystals had higher thermal stability.The adsorption isotherm results showed that ZCHO microcrystals with CS exhibited massive removal of Cu^2+ from aqueous solution at room temperature.The equilibrium adsorption was well described by the Freundlich isotherm model.The possible removal mechanism of Cu^2+ by the multi-layered ZCHO was also discussed.