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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Recycling Fe and improving organic pollutant removal via in situ forming magnetic core-shell Fe3O4@CaFe-LDH in Fe(Ⅱ)-catalyzed oxidative wastewater treatment
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.

CaFe layered double hydroxideFe(Ⅱ)-catalytic oxidationFe recyclingMagnetic nanomaterialin situ formationFe3O4 modification

Ting He、Jie Sun、Liangwei Deng、Jialin Ming、Changwei Hu

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Key Laboratory of Green Chemistry and Technology,Ministry of Education,College of Chemistry,Sichuan University,Chengdu 610064,China

Biogas Institute of Ministry of Agriculture and Rural Affairs,Chengdu 610041,China

Inner Mongolia Key Laboratory of Fine Organic Synthesis,Inner Mongolia University,Hohhot 010021,China

CaFe layered double hydroxide Fe(Ⅱ)-catalytic oxidation Fe recycling Magnetic nanomaterial in situ formation Fe3O4 modification

2025

10.1016/j.jes.2023.12.013

环境科学学报(英文版)
中科院生态环境研究中心

环境科学学报(英文版)

影响因子：0.862
ISSN：1001-0742
年,卷(期)：2025.147(1)