CAJ | 학술논문

通过共沉淀法合成了ZnAlLa三元类水滑石,并考察了其结构特征和对磷酸根的吸附性能.结果表明,在保持类水滑石层状结构的条件下,La的适量掺杂可增强吸附剂对磷酸根的吸附.当Zn∶Al∶La摩尔比为2.00∶0.90∶0.10时,ZnAlLa类水滑石在24h内对污泥脱水液中磷酸根的吸附量为35.15 mg P·g~(-1),比无La时的吸附量提高了41.9%.300℃焙烧处理后,ZnAlLa样品转化为亚稳态的复合金属氧化物,同时比表面积明显增加,其磷酸根吸附量约为焙烧前的1.48倍.ZnAlLa对磷酸根的吸附在pH变化及竞争离子存在时表现出较强的稳定性.该吸附剂对污泥脱水液中磷酸根的吸附符合假二级吸附动力学;吸附等温线表现为Langmuir型.
통과공침정법합성료ZnAlLa삼원류수활석,병고찰료기결구특정화대린산근적흡부성능.결과표명,재보지류수활석층상결구적조건하,La적괄량참잡가증강흡부제대린산근적흡부.당Zn∶Al∶La마이비위2.00∶0.90∶0.10시,ZnAlLa류수활석재24h내대오니탈수액중린산근적흡부량위35.15 mg P·g~(-1),비무La시적흡부량제고료41.9%.300℃배소처리후,ZnAlLa양품전화위아은태적복합금속양화물,동시비표면적명현증가,기린산근흡부량약위배소전적1.48배.ZnAlLa대린산근적흡부재pH변화급경쟁리자존재시표현출교강적은정성.해흡부제대오니탈수액중린산근적흡부부합가이급흡부동역학;흡부등온선표현위Langmuir형.
A series of ZnAlLa layered double hydroxides (LDHs) were synthesized by the coprecipitation method,and their structure and phosphate adsorption capacities were studied.The results showed that the layered structure was maintained when a proper amount of La was added as a trivalent cation into ZnAl LDHs.At the Zn∶Al∶La molar ratio of 2.00∶0.90∶0.10,the phosphate adsorption by the obtained ZnAlLa LDHs in 24 h was 35.15 mg P·g~(-1),which was 41.9% higher than that by the La-free LDHs.After calcination at 300℃,the ZnAlLa LDHs were transformed to metastable mixed metal oxides with a higher specific surface area.The phosphate adsorption by the calcined LDHs was 1.48-fold higher when compared with that by the raw material.The phosphate adsorption by the ZnAlLa showed a high stability against pH variation and competing ions in the solution.The adsorption kinetics followed a pseudo-second-order model and the isotherms were of the Langmuir type.