MgFe compounds for water purification: the effect of annealing temperature on lead removal performance

Co-precipitation in alkaline solution is a straightforward synthesis method for layered double hydroxide (LDH) materials. Iron-containing LDH materials readily transform to spinel ferrite upon annealing. We prepared MgFe compounds annealed at different temperatures and investigated the effect of ann...

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Published in:Desalination and water treatment 2019-01, Vol.137, p.183-193
Main Authors: Leung, Tik Lun, Kam, Chun Sing, Sun, Qian, Djurišić, Aleksandra B., Xie, Mao Hai, Chan, Wai Kin, Li, Hang Kong, Zhou, Ying, Shih, Kaimin
Format: Article
Language:English
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Layered double hydroxide
Lead removal
Magnesium leaching
Spinel ferrite
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container_end_page 193
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container_start_page 183
container_title Desalination and water treatment
container_volume 137
creator Leung, Tik Lun
Kam, Chun Sing
Sun, Qian
Djurišić, Aleksandra B.
Xie, Mao Hai
Chan, Wai Kin
Li, Hang Kong
Zhou, Ying
Shih, Kaimin
description Co-precipitation in alkaline solution is a straightforward synthesis method for layered double hydroxide (LDH) materials. Iron-containing LDH materials readily transform to spinel ferrite upon annealing. We prepared MgFe compounds annealed at different temperatures and investigated the effect of annealing temperature on their physical properties and lead adsorption abilities. The co-precipitated samples annealed at 400°C and 600°C exhibited LDH crystal structure, while the samples annealed at 700°C and 800°C had spinel ferrite structure. The maximum lead adsorption capacity reduced with increasing annealing temperature. Transformation from MgFe LDH to spinel ferrite structure after annealing at 600°C leads to the loss of surface area and the elimination of interlayer anions, resulting in a reduction of lead adsorption capacity. Although decreased lead adsorption capacity was found in spinel ferrite sample, magnesium leaching was significantly reduced compared with MgFe LDH samples, indicating enhanced sample stability.
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subjects Layered double hydroxide
Lead removal
Magnesium leaching
Spinel ferrite
title MgFe compounds for water purification: the effect of annealing temperature on lead removal performance
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