首页|Recycling Fe and improving organic pollutant removal via in situ forming magnetic core-shell Fe3O4@CaFe-LDH in Fe(Ⅱ)-catalyzed oxidative wastewater treatment
Recycling Fe and improving organic pollutant removal via in situ forming magnetic core-shell Fe3O4@CaFe-LDH in Fe(Ⅱ)-catalyzed oxidative wastewater treatment
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Due to its high efficiency,Fe(Ⅱ)-based catalytic oxidation has been one of the most popu-lar types of technology for treating growing organic pollutants.A lot of chemical Fe sludge along with various refractory pollutants was concomitantly produced,which may cause sec-ondary environmental problems without proper disposal.We here innovatively proposed an effective method of achieving zero Fe sludge,reusing Fe resources(Fe recovery=100％)and advancing organics removal(final TOC removal＞70％)simultaneously,based on the in situ formation of magnetic Ca-Fe layered double hydroxide(Fe3O4@CaFe-LDH)nano-material.Cations(Ca2+and Fe3+)concentration(≥ 30 mmol/L)and their molar ratio(Ca:Fe ≥ 1.75)were crucial to the success of the method.Extrinsic nano Fe3O4 was designed to be in-volved in the Fe(Ⅱ)-catalytic wastewater treatment process,and was modified by oxida-tion intermediates/products(especially those with COO-structure),which promoted the co-precipitation of Ca2+(originated from Ca(OH)2 added after oxidation process)and by-produced Fe3+cations on its surface to in situ generate core-shell Fe3O4@CaFe-LDH.The oxidation products were further removed during Fe3O4@CaFe-LDH material formation via intercalation and adsorption.This method was applicable to many kinds of organic wastew-ater,such as bisphenol A,methyl orange,humics,and biogas slurry.The prepared magnetic and hierarchical CaFe-LDH nanocomposite material showed comparable application perfor-mance to the recently reported CaFe-LDHs.This work provides a new strategy for efficiently enhancing the efficiency and economy of Fe(Ⅱ)-catalyzed oxidative wastewater treatment by producing high value-added LDHs materials.
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