Ni/Cr-[α-SiW12O40] Layered Double Hydroxide as Effective Adsorbent of Iron(II) From Aqueous Solution

A Lesbani,R Andreas,R Mohadi,M.F Azmi,T Taher,N.R Palapa

doi:10.18321/ectj1080

Abstract

Layered double hydroxide (LDH) Ni/Cr intercalated [α-SiW12O40]4- has been prepared using the coprecipitation method. Materials were characterized by X-ray, FTIR, BET, and pHpzc analyses. Material Ni/Cr-[α-SiW12O40] LDHs exhibited a high surface area 98.986 m2 g-1 from 11.030 m2 g-1 for Ni/Cr LDH where the interlayer space was an increase from 7.99 to 10.87 Å with indicated that high crystallinity. Ni/Cr-[α-SiW12O40] LDHs showed higher adsorption capacity for iron(II) is up to 250 mg g-1. Adsorption of iron(II) on LDHs has an endothermic process and classify as physical adsorption.

Highlights

Wastewater treatment is an important universal concern due to environmental impact and human health [1]
Heavy metals have a bad effects on the environmental and humans because heavy metals ion can be accumulated in the organism [3], so these problems are challenging researchers to overcome the heavy metal bad effect on the environmental
Ni/Cr Layered double hydroxide (LDH) was successfully synthesized via a facile coprecipitation method under alkaline conditions

Summary

Introduction

Wastewater treatment is an important universal concern due to environmental impact and human health [1]. Inorganic adsorbents such as zeolite, activated carbon, clay, bentonite, montmorillonite, and synthetic layer materials have been widely applied to remove heavy metal from aqueous solution [9,10,11]. Zn/Al LDH was intercalated with thiacalix[4]arane anion by calcination/ restoration into LDH These materials were used as adsorbents of Pb2+ and Cu2+ with adsorption capacity (qm) for Pb2+ and Cu2+ up to 217 mg g-1 and 125 mg g-1, respectively [20]. Iron (II) in high concentration, need to be decreasing because it is harmful and accumulated in the animal body [26] Because of these findings, the way to remove Fe (II) is challenging the researcher to protect the environment. Materials Several factors of adsorption were studied, such as pHpzc, effect of adsorption time, effect of concentration of iron(II) and temperature, and kinetic and thermodynamic properties were calculated based on experimental data

Chemicals and instrumentations

Determination of pHpzc

Adsorption studies

Results and discussion

Conclusion