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本研究采用共沉淀法成功制备了CaAl类水滑石(CaAl-LDH),并运用扫描电子显微镜(SEM)和热重/差示扫描量热分析(TG-DSC)技术对CaAl-LDH的形貌及热稳定性进行了表征.利用合成含磷溶液及真实含磷污水,探究了CaAl-LDH对磷酸根的吸附性能及其主要影响因素.结果表明:制备的CaAl-LDH具备类水滑石的典型六边形层片状结构以及较好的热稳定性.CaAl-LDH吸附磷酸根的规律符合Langmuir吸附等温方程,理论最大吸附容量为162.3mg/g.吸附动力学过程符合假二级动力学方程.几种竞争阴离子对吸附的干扰作用由强到弱为23CO->24SO->3NO-.吸附真实含磷污水中磷酸根时,10h左右达最大去除率,可将污水中磷浓度降低到极低水平.因此,制备的CaAl-LDH具有很好的磷酸根吸附性能,是一种应用前景广阔的污水磷酸根吸附回收利用材料.
In the present study, CaAl-LDH was successfully prepared by coprecipitation. The morphology of CaAl-LDH was characterized by scanning electron microscopy (SEM) and thermogravimetry / differential scanning calorimetry (TG-DSC) And the thermal stability of CaAl-LDH were studied.The adsorption capacity of CaAl-LDH to phosphate and its main influencing factors were explored by using synthetic phosphorus-containing solution and real phosphorus-containing wastewater.The results showed that the prepared CaAl-LDH had the typical hydrotalcite- Hexagonal lamellar structure and good thermal stability.The adsorption of phosphate by CaAl-LDH accorded with Langmuir adsorption isotherm equation, the theoretical maximum adsorption capacity was 162.3mg / g.The adsorption kinetics was in accordance with the pseudo-second-order kinetic equation .The interference of several competitive anions on adsorption was from strong to weak (23CO-> 24SO-> 3NO-). When the phosphate in the phosphorus-containing wastewater was adsorbed, the maximum removal rate reached about 10h, which reduced the phosphorus concentration in the wastewater to the extreme Low level.Therefore, the prepared CaAl-LDH has good phosphate adsorption performance, is a promising application of wastewater phosphate recovery and recycle materials.