CAJ | 학술논문

采用水热法合成了不同铁掺杂量的Mg/Al/Fe型类水滑石(MAF),根据X射线衍射(XRD)的测定结果,铁存在一个最佳投加量,铁的掺杂量过大则会导致水滑石的层状结构被破坏.通过扫描电镜(SEM)和比表面分析仪(BET)研究了MAF焙烧后的复合金属氧化物(CMAF)的结构和性能,并考察了CMAF对水中氟离子的吸附性能.与CMA相比(铁掺杂量为零),CMAF对氟离子的吸附去除效率明显提高(最大吸附容量75.2 mg/g),整个吸附过程可以用Langmuir吸附等温线更好地描述.通过XRD测定和晶格参数计算,CMAF的结构由吸附前的复合氧化物恢复到层状水滑石结构,表明氟离子在水滑石重构过程中作为层间阴离子进入到水滑石内部,从而达到较高的除氟效率.
채용수열법합성료불동철참잡량적Mg/Al/Fe형류수활석(MAF),근거X사선연사(XRD)적측정결과,철존재일개최가투가량,철적참잡량과대칙회도치수활석적층상결구피파배.통과소묘전경(SEM)화비표면분석의(BET)연구료MAF배소후적복합금속양화물(CMAF)적결구화성능,병고찰료CMAF대수중불리자적흡부성능.여CMA상비(철참잡량위령),CMAF대불리자적흡부거제효솔명현제고(최대흡부용량75.2 mg/g),정개흡부과정가이용Langmuir흡부등온선경호지묘술.통과XRD측정화정격삼수계산,CMAF적결구유흡부전적복합양화물회복도층상수활석결구,표명불리자재수활석중구과정중작위층간음리자진입도수활석내부,종이체도교고적제불효솔.
In this study, Mg/Al/Fe hydrotalcites (MAF) with different iron content were prepared by hy-drothermal method. Based on the characterization of XRD, there existed a suitable iron ratio and the layer structure would be destroyed with excessive iron. The morphology and property of the mixed oxides derived from MAF (CMAF) were characterized by SEM and BET. The adsorption of fluoride on CMAF was also investigated. In comparison with CMA (iron content was O) , CMAF exhibited a higher efficiency toward fluoride removal (the maximum adsorption capacity is 75.2 mg/g) . Langmuir isotherm was found more suitable to describe the adsorption process. Moreover, the structure of CMAF shifted to layer structure after fluoride adsorption. The result indicates that fluoride has intercalated the layer structure of hydrotalcite, leading to higher efficiency of fluoride removal.