Abstract
Layered double hydroxide (LDH) Ni/Al-NO3 was synthesized using a coprecipitation method under base condition following with intercalation using Keggin ion [a-SiW12O40]4- to form Ni/Al-[a-SiW12O40] LDH. The LDHs were characterized using XRD, FTIR, BET, and pHpzc analyses. Furthermore, LDHs were applied as adsorbent of iron(II) from aqueous solution. The adsorption process was studied through the effect of adsorption time, the concentration of iron(II), and temperature adsorption. The results show the interlayer distance of LDHs was increased from 7.408 Å to 10.533 Å after intercalation process. The adsorption of iron(II) on LDHs showed that adsorption of iron(II) on both LDHs follows pseudo first-order kinetic model with R2 value is close to one. The adsorption process was spontaneous, with adsorption capacity up to 36.496 mg g-1.
Highlights
Water pollution from heavy metals has directly affected to ecological balance and flora, fauna, and human health
Mg-Fe Layered double hydroxide (LDH) hollow nanosphere, which was prepared by one step thermal method, was used as adsorbent of heavy metal ions such as As5+ and Cr6+ with maximum adsorption capacity 176.6 mg g-1 for arsenic and 148.7 mg g-1 for chromium (Mubarak et al, 2018)
The wellordered layer material of Ni/Al-NO3 was identified at 11o (003), 24o (006), and 62o (110) (Zhang et al, 2019)
Summary
Water pollution from heavy metals has directly affected to ecological balance and flora, fauna, and human health. Various methods have been applied to remove heavy metal ions from a solution such as ion exchange, membrane filtration, coagulation, and adsorption (Taher, Mohadi, & Lesbani, 2018a). The efficiency process of adsorption depends on kinds of the adsorbent for the removal of heavy metals.
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