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标题：Effective Removal of Iron (II) from Aqueous Solution by Adsorption using Zn/Cr Layered Double Hydroxides Intercalated with Keggin Ion
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作者：Melantina Oktrianty ; Neza Palapa ; Risfidian Mohadi 等
期刊名称：Inżynieria Ekologiczna
印刷版ISSN：2081-139X
电子版ISSN：2392-0629
出版年度：2020
卷号：21
期号：5
页码：63-71
DOI：10.12911/22998993/122190
出版社：Polish Society of Ecological Engineering (PTIE)
摘要：Zn/Cr and Zn/Cr layered double hydroxides (LDHs) intercalated with Keggin ion [α-SiW12O40]4- were successfully synthesized at room temperature and pH value of 10.The synthesized materials were characterized by means of the XRD, BET, and FT-IR analyses and used as an adsorbent iron(II).The adsorption process was investigated by studying pH, the kinetics, and thermodynamic properties of the adsorption process.The results showed the interlayer Zn/Cr LDHs was 7.53 Å and increase to 10.26 Å on Zn/Cr LDHs intercalated with Keggin ion [α-SiW12O40]4-.The BET analysis showed that the pore volume of both materials increased from 0.063 cm3 g-1 to 0.163 cm3 g-1.The pH point zero charge measurement for the Zn/Cr LDHs material was 10 while LDHs Zn/Cr intercalated with Keggin ion [α-SiW12O40]4- was 8.Zn/Cr LDHs intercalated with Keggin ion [α-SiW12O40]4- has higher adsorption capacity than Zn/Cr LDHs without intercalation.Desorption of iron (III) was successfully conducted using HCl as reagent showing the involvement of ion exchange in the adsorption.
关键词：desorption ; adsorption ; iron(II) ; layered double hydroxides ; Zn/Cr