Feasibility study of applying a graphene oxide-alginate composite hydrogel to electrokinetic remediation of Cu(II)-contaminated loess as electrodes

Hu, Wenle; Cheng, Wen-Chieh; Wang, Yihan; Wen, Shaojie

doi:10.1016/j.seppur.2023.124361

Cited by 65 publications

(2 citation statements)

References 52 publications

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“…To tackle the said issue, many remediation technologies applied for Pb immobilization have been developed ( Bai et al, 2022 ; Xie et al, 2022 ; Xue et al, 2022 ; Xue et al, 2023 ). However, they are often criticized due to poor performance and are accompanied by a high risk of secondary contamination ( Yang et al, 2020 ; Meng et al, 2022 ; Hu et al, 2023a ; Hu et al, 2023b ; Wang et al, 2023 ; Bai et al, 2024 ; Xue et al, 2024b ).…”

Section: Introductionmentioning

confidence: 99%

Nano-hydroxyapatite-assisted enzyme-induced carbonate precipitation enhances Pb-contaminated aqueous solution and loess remediation

Bian,

Cheng,

Xie

et al. 2024

Front. Bioeng. Biotechnol.

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Intensive agricultural activities could cause lead (Pb) bioaccumulation, threatening human health. Although the enzyme-induced carbonate precipitation (EICP) technology has been applied to tackle the aforesaid problem, the urease may denature or even lose its activity when subjected to a significant Pb2+ toxicity effect. To this end, the nano-hydroxyapatite (nHAP)-assisted EICP was proposed to reduce the mobility of Pb2+. Results indicated that a below 30% immobilization efficiency at 60 mM Pb2+ was attained under EICP. nHAP adsorbed the majority of Pb2+, preventing Pb2+ attachment to urease. Further, hydroxylphosphohedyphane or hydroxylpyromorphite was formed at 60 mM Pb2+, followed by the formation of cerussite, allowing hydroxylphosphohedyphane or hydroxylpyromorphite to be wrapped by cerussite. By contrast, carbonate-bearing hydroxylpyromorphite of higher stability (Pb10(PO4)6CO3) was developed at 20 mM Pb2+ as CO32− substituted the hydroxyl group in hydroxylpyromorphite. Moreover, nHAP helped EICP to form nucleated minerals. As a result, the EICP-nHAP technology raised the immobilization efficiency at 60 mM Pb2+ up to 70%. The findings highlight the potential of applying the EICP-nHAP technology to Pb-containing water bodies remediation.

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Section: Introductionmentioning

confidence: 99%

Nano-hydroxyapatite-assisted enzyme-induced carbonate precipitation enhances Pb-contaminated aqueous solution and loess remediation

Bian,

Cheng,

Xie

et al. 2024

Front. Bioeng. Biotechnol.

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“…In addition, the loess has been used as an earthen final cover (EFC) material on a small scale (Zhan et al, 2014). The Chinese Loess Plateau (CLP) is located in the central and western parts of China and formed in arid and semi-arid climatic conditions, and the widely distributed loess is a typical unsaturated soil (Wen et al, 2023b;Bai et al, 2022;Hu et al, 2023;Zhang D. F. et al, 2020). The loess has great potential as an EFC material (Xue et al, 2023;Wang et al, 2023;Zhan et al, 2016;Zhan et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Changes in air and liquid permeability properties of loess due to the effect of lead contamination

Wen

Cheng

et al. 2023

Front. Earth Sci.

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Heavy metals in landfill leachate are easily adsorbed by soil particles, causing serious threats to human health and surrounding environments. Mining and metallurgy activities are intensive in Northwest China, thereby enlarging threats. The aim of the present study is to enhance our knowledge about the linkage between the microstructural evolution of the loess soil induced by lead contamination and the macro air and liquid permeability properties. A series of air and liquid permeability tests on the uncontaminated and Pb-contaminated loess specimens were conducted. Their air and liquid permeability properties were evaluated on the basis of Darcy’s law and the soil–water retention curves, respectively. The microstructural evolution, when subjected to low and high Pb2+ concentrations, was assessed using scanning electron microscopy (SEM), X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), and zeta potential tests. The intrusion of Pb2+ decreases the absolute zeta potential ζ, which in turn leads to a more distinct agglomerated structure and higher intrinsic permeability. Moreover, the dedolomitization and associated cerussite (PbCO3) precipitation are deemed as the main cause of micropore clogging, whereas the corrosion of the cement between soil particles by H+ shows a good correspondence to an increase in the number of mesopores. With the concentration of Pb2+ increasing from 0 to 2,000 mg/kg, the proportion of micropores decreases from 37.9% to 15.1%, and the proportion of mesopores increases from 17.3% to 53.3%. In addition, the air entry value decreased from 19.5 to 12.8 kPa, indicating that the water retention behavior decreased. The findings highlight the impacts of lead contamination on the microstructure and macro permeability properties and give some design guideposts to heavy metal-contaminated site remediation.

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Sustainable Permeable Reactive Barrier Materials for Electrokinetic Remediation of Heavy Metals‐Contaminated Soil

Naseer,

Ali,

Younis

et al. 2024

Advanced Sustainable Systems

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Thegreen and sustainable remediation technologies in curing heavy metals (HMs)‐contaminated soil require recyclable, cost‐effective, and sustainable materials to achieve good health, and sustainable goals. Electrokinetic remediation coupled with a permeable reactive barrier (EKR‐PRB) has been recognized as a viable technique for remedying HMs‐contaminated soil, owing to its passive operation, inexpensiveness, and environmental compatibility. However, most fillermaterials in PRB are expensive and environmentally unfriendly, affecting thesustainable development goals of the planet. This review comprehensivelyexamines the current progress on using waste/recyclable materials as fillermaterials in EKR‐PRB to remove toxic HMs from contaminated soil. These materialsare waste/recyclable materials, biochar, charcoals, and cork, which have shownhigh potential as EKR‐PRB fillers in extracting HM‐contaminated soil. Thesematerials provide a path to reduce both remediation costs and environmentalimpact, enhancing the practicality and sustainability of the EKR‐PRBapplication. The review commences with a brief discussion of the fundamentalsof EKR‐PRB and key operational parameters affecting the remediationperformance, with a focus on the ecological and economic benefits associatedwith these novel filler materials. Ultimately, it presents future perspectivesand outlines critical challenges in scaling up the application of sustainablePRB materials for effective and environmentally responsible soil remediation.

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Feasibility study of applying a graphene oxide-alginate composite hydrogel to electrokinetic remediation of Cu(II)-contaminated loess as electrodes

Cited by 65 publications

References 52 publications

Nano-hydroxyapatite-assisted enzyme-induced carbonate precipitation enhances Pb-contaminated aqueous solution and loess remediation

Nano-hydroxyapatite-assisted enzyme-induced carbonate precipitation enhances Pb-contaminated aqueous solution and loess remediation

Changes in air and liquid permeability properties of loess due to the effect of lead contamination

Sustainable Permeable Reactive Barrier Materials for Electrokinetic Remediation of Heavy Metals‐Contaminated Soil

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