Modified nanoscale zero-valent iron in persulfate activation for organic pollution remediation: a review

Wang, Bing; Deng, Chaoxiao; Ma, Wei; Sun, Yubo

doi:10.1007/s11356-021-13972-w

Cited by 44 publications

(4 citation statements)

References 165 publications

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“…The characteristic peaks of the Fe element can be detected in figure 4(e), confirming the presence of the element. The combination of iron oxides with peaks corresponding to 711 and 725 eV indicates the successful loading of Fe 3 O 4 [45,46]. Obviously, this result is consistent with the FT-IR result.…”

Section: Resultssupporting

confidence: 88%

Study on adsorption performance and mechanism of peanut hull-derived magnetic biochar for removal of malachite green from water

Zhao,

Hua,

Wang

et al. 2023

Mater. Res. Express

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Magnetic biochar (MBC) has the advantages including wide source of raw materials and low cost, and has become a potential adsorbent for water treatment, overcoming the shortcomings of biochar (BC) with the hard separation of solid and liquid. Peanut hull-derived magnetic biochar loaded with Fe3O4 (Fe3O4/BC) was prepared by co-precipitation method. By means of material characterization and batch processing experiments, material properties and environmental factors affecting adsorption performance were investigated. The adsorption mechanism of Fe3O4/BC on malachite green (MG) was revealed using adsorption isotherms, adsorption kinetics and thermodynamics. The results showed that Fe3O4 particles were uniformly loaded, the total pore volume was increased, surface oxygen-containing functional groups were formed, and the maximum adsorption capacity of the biochar reached 175.4mg/g, 1.6 times of that before modification. In a wide PH range, Fe3O4/BC showed high adsorption performance for MG, and significant influence from ionic strength wasn’t found. Chemical adsorption was the main adsorption mechanism, including electrostatic interaction, cation exchange, hydrogen bonding and π-π interaction. The study of adsorption mechanism will promote the application of MBC in the removal of organic pollutants from water.

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Section: Resultssupporting

confidence: 88%

Study on adsorption performance and mechanism of peanut hull-derived magnetic biochar for removal of malachite green from water

Zhao,

Hua,

Wang

et al. 2023

Mater. Res. Express

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“…Impedance spectroscopy showed no significant change in the electrolyte background after the introduction of Fe 3+/2+ (Figure S6). Surprisingly, 1–15 ppb As(III) detection of 0.487 μA ppb –1 was achieved in the lake water after Cu removal (Figure b), probably due to the enhanced response signal introduced by the high Fe 3+/2+ concentration in the lake water after immersion (Table S2), and a variety of organic species might be removed by iron powder Figure c indicates the long-time stability tests of 3 ppb As(III) at the same electrode for 10 days, and the relative standard deviation (RSD) of peak currents is 2.55%.…”

Section: Results and Discussionmentioning

confidence: 99%

Practical Strategy for Arsenic(III) Electroanalysis without Modifier in Natural Water: Triggered by Iron Group Ions in Solution

Cai

Xia

et al. 2023

Anal. Chem.

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Significant progress has been made in nanomaterial-modified electrodes for highly efficient electroanalysis of arsenic(III) (As(III)). However, the modifiers prepared using some physical methods may easily fall off, and active sites are not uniform, causing the potential instability of the modified electrode. This work first reports a promising practical strategy without any modifiers via utilizing only soluble Fe3+ as a trigger to detect trace-level As(III) in natural water. This method reaches an actual detection limit of 1 ppb on bare glassy carbon electrodes and a sensitivity of 0.296 μA ppb–1 with excellent stability. Kinetic simulations and experimental evidence confirm the codeposition mechanism that Fe3+ is preferentially deposited as Fe0, which are active sites to adsorb As(III) and H+ on the electrode surface. This facilitates the formation of AsH3, which could further react with Fe2+ to produce more As0 and Fe0. Meanwhile, the produced Fe0 can also accelerate the efficient enrichment of As0. Remarkably, the proposed sensing mechanism is a general rule for the electroanalysis of As(III) that is triggered by iron group ions (Fe2+, Fe3+, Co2+, and Ni2+). The interference analysis of coexisting ions (Cu2+, Zn2+, Al3+, Hg2+, Cd2+, Pb2+, SO4 2–, NO3 –, Cl–, and F–) indicates that only Cu2+, Pb2+, and F– showed inhibitory effects on As(III) due to the competition of active sites. Surprisingly, adding iron power effectively eliminates the interference of Cu2+ in natural water, achieving a higher sensitivity for 1–15 ppb As(III) (0.487 μA ppb–1). This study provides effective solutions to overcome the potential instability of modified electrodes and offers a practical sensing platform for analyzing other heavy-metal anions.

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“…Especially, nZVI exhibits higher reactive due to the high specific surface area and small size, which could effectively activate persulfate to degrade organic pollutants (Fu et al 2014;Chokejaroenrat et al 2015). However, nZVI has the problems of easy agglomeration, easy oxidation, poor stability and difficult separation from the solution after use, which limits its application (Xiao et al 2020;Wang et al 2021). To solve the above problems, some researchers loaded nZVI onto the solid materials like carbon (Li et al 2022), bentonite (Baldermann et al 2021), kaolinite (Lakkaboyana et al 2021) and zeolite (Eljamal et al 2021) for removing pollutants more effectively.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Enhanced catalytic activity and stability of composite of cellulose film and nano zero-valent iron on Juncus effusus for activating peroxydisulfate to degrade Rhodamine B dye

Zhang

et al. 2022

Water Science and Technology

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In this study, a novel peroxydisulfate (PDS) activator (CF-nZVI-JE) was prepared via in-situ loading nano zero-valent iron (nZVI) on Juncus effusus (JE) followed with wrapping a layer of cellulose film (CF). The CF-nZVI-JE had the same 3D structure as the JE, being easy to separate from aqueous solution. The loaded nZVI existed single nanoparticles with a size of 60–100 nm except chain-type agglomeration of nanoparticles due to the stabilization of JE fibers. The activation performance of the CF-nZVI-JE for PDS was evaluated with Rhodamine B (Rh B) as a representative pollutant. Under the optimal activating conditions, the degradation rate of Rh B reached 99% within 30 min in the CF-nZVI-JE/PDS system. After five cycles, the degradation rate of Rh B was still over 85%, suggesting that the CF-nZVI-JE had good reusability. More interestingly, SO4·− and ·OH radicals were simultaneously detected in the CF-nZVI-JE/PDS system, but only SO4·− existed in the JE-ZVI/PDS system, suggesting the different activation mechanism. Meanwhile, the introduction of CF not only facilitated to the mineralization of Rh B but also significantly reduced the release amount of iron ions. Hence, the CF-nZVI-JE can be employed as a promising PDS activator for the treatment of organic wastewater.

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Modified nanoscale zero-valent iron in persulfate activation for organic pollution remediation: a review

Cited by 44 publications

References 165 publications

Study on adsorption performance and mechanism of peanut hull-derived magnetic biochar for removal of malachite green from water

Study on adsorption performance and mechanism of peanut hull-derived magnetic biochar for removal of malachite green from water

Practical Strategy for Arsenic(III) Electroanalysis without Modifier in Natural Water: Triggered by Iron Group Ions in Solution

Enhanced catalytic activity and stability of composite of cellulose film and nano zero-valent iron on Juncus effusus for activating peroxydisulfate to degrade Rhodamine B dye

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