Co-activation of persulfate by cation and anion from FeP for advanced oxidation processes

Zheng, Ningchao; He, Xiaoming; Hu, Ruiting; Guo, Wei; Hu, Zhuofeng

doi:10.1016/j.apcatb.2021.120505

Cited by 48 publications

(6 citation statements)

References 57 publications

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“…A plane-wave basis set was employed to expand the smooth part of wavefunctions with a cut-off kinetic energy of 450 eV. The electronic convergence limit was set to be 1 × 10 –5 eV. − Optimization of atomic coordinates was considered converged when Hellmann–Feynman force was lower than 1 × 10 –2 eV Å –1 . The slab consists of metal-C 3 N 4 constructed.…”

Section: Methodsmentioning

confidence: 99%

Enhancement of g-C₃N₄ Photocatalysis by Selectively Anchoring Metal Cocatalysts with a Strong Metal–Support Interaction

Huang

Cao

Wei

et al. 2022

ACS Appl. Nano Mater.

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Cocatalysts (Pt or Pd) can significantly enhance the activity of photocatalysts. However, the electron transfer between cocatalysts and different kinds of functional groups have not been thoroughly studied. Here, a strategy of selectively anchoring cocatalysts (Pt or Pd nanoparticles (NPs)) on oxygen-doped carbon nitride (O-CN) was developed to optimize the electron transfer and enhance the photocatalytic activity. The oxygen functional groups are found to be beneficial to the loading of cocatalysts on the surface of O-CN. The adsorption energy (E ads) of Pd NPs on the N–C–O site is more negative than that on the C–O–C site, resulting in a favorable anchoring of Pd NPs on N–C–O, while the E ads of Pt NPs is lower on C–O–C than on N–C–O, leading to a preferential deposition of Pt on C–O–C. The O atom of N–C–O species, which possesses a lower value of isolated state than that of C–O–C species, shows a weaker electron-withdrawal property. So that the electrons can quickly transfer from O-CN to Pd than to Pt, leading to a higher hydrogen generation activity of O-CN/Pd than those of O-CN/Pt by photocatalytic water splitting. This is conducive to understand the interaction between the cocatalysts and O functional group on O-CN and the design of high-efficiency photocatalysts.

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Section: Methodsmentioning

confidence: 99%

Enhancement of g-C₃N₄ Photocatalysis by Selectively Anchoring Metal Cocatalysts with a Strong Metal–Support Interaction

Huang

Cao

Wei

et al. 2022

ACS Appl. Nano Mater.

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“…, E 0 = 2.5−3.1 V) via the reactions of eqs 1−3, 19−21 exhibiting outstanding potential in the removal of NH 4 + -N. However, the addition of PS resulted in the acidification of the solution, 22 making NH 4 + -N mainly exist in the form of NH 4 + . As the reactivities of SO 4…”

Section: Introductionmentioning

confidence: 99%

“…Activation of peroxides such as H 2 O 2 , persulfate (PS), and peroxymonosulfate (PMS) has been extensively employed for ROS generation in AOPs. , PS is one of the most commonly used peroxides, which has attracted an increasing interest in the field of AOPs . PS activated by UV irradiation or other methods resulted in the formation of highly reactive SO 4 •– and HO • (HO • , E 0 = 1.9–2.8 V; SO 4 •– , E 0 = 2.5–3.1 V) via the reactions of eqs –, − exhibiting outstanding potential in the removal of NH 4 + -N. However, the addition of PS resulted in the acidification of the solution, making NH 4 + -N mainly exist in the form of NH 4 + . As the reactivities of SO 4 •– and HO • toward NH 4 + were lower than that with NH 3 (eqs –), , the removal efficiency of NH 4 + -N by the activated PS would be decreased under acidic conditions.…”

Section: Introductionmentioning

confidence: 99%

Rapid Oxidation of Ammonia Nitrogen to Nitrogen Gas by UV-Activated Persulfate with Calcium Oxide

Jiang,

Wang,

Zhou

et al. 2024

ACS EST Eng.

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Advanced oxidation processes (AOPs) for removing ammonia nitrogen (NH 4 + -N) are of increasing interest in wastewater treatment. In this paper, the UV-activated persulfate (PS) process with CaO was applied to oxidize NH 4 + -N to nitrogen gas (N 2 ). Nearly all of the NH 4 + -N (30 mg N/L) could be removed within 15 min, and the N 2 selectivity was achieved at 95.0%. The addition of CaO made NH 4 + -N exist in the form of NH 3 , and HO • was the critical reactive species for NH 4 + -N oxidation. NO, N 2 H 4 , and NO 2 − were identified as oxidation intermediates and could be further removed. The reaction between N 2 H 4 and NO 2 − with the assistance of UV/ CaO promoted N 2 generation during NH 4 + -N oxidation. The increased dosages of CaO (0.2 to 4.0 g/L) and PS (0.6 to 2.4 g/L) could enhance the NH 4 + -N oxidation, while the presence of CO 3 2− (100 mM) significantly retarded the removal of NH 4 + -N. As high removal of NH 4 + -N (100%) and high N 2 selectivity (>79.5%) could be achieved in lake water and secondary wastewater, the proposed UV/PS/CaO process could be potentially applied for the oxidation of NH 4 + -N in practical water treatment.

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“…Today, a host of catalysts have been used and developed in SR-AOPs and exhibited good potential. Activated persulfates by transition metal are commonly used, for example iron [18], cobalt [19], manganese [20] and copper [21], among which iron is the most popular because of easy access, low costly and no secondary pollution [22]. Researchers often prepared catalysts with specific features or functions to improve the performance of catalysts by introduced some macromolecular compounds or substances rich in functional groups in the process.…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Synthesis of Iron Ore@Biomass Derived ESBC to Degrade Tetracycline Hydrochloride for Heterogeneous Persulfate Activation

et al. 2022

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Iron-based catalysts are widely used in water treatment and environmental remediation due to their abundant content in nature and their ability to activate persulfate at room temperature. Here, eggshell biochar-loaded natural iron slag (IO@ESBC) was successfully synthesized to remove tetracycline hydrochloride (TCH) by activated persulfate. The morphology, structure and chemical composition of IO@ESBC were systematically characterized. The IO@ESBC/PS process showed good performance for TCH removal. The decomposition rate constant (k) for IO@ESBC was 0.011 min−1 and the degradation rate was 3690 mmol/g/h in this system. With the increase of PS concentration and IO@ESBC content, the removal rate of TCH both increased. The IO@ESBC/PS process can effectively remove TCH at pH 3–9. There are different effects on TCH removal for the reason that the addition of water matrix species (humic acid, Cl−, HCO3−, NO3− and HPO42−). The IO@ESBC/PS system for degrading TCH was mainly controlled by both the free radical pathway (SO4•−, •OH and O2•−) and non-free radical pathway (1O2). The loading of ESBC slows down the agglomeration between iron particles, and more active sites are exposed. The removal rate of TCH was still above 75% after five cycles of IO@ESBC. This interesting investigation has provided a green route for synthesis of composite driving from waste resources, expanding its further application for environmental remediations.

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Co-activation of persulfate by cation and anion from FeP for advanced oxidation processes

Cited by 48 publications

References 57 publications

Enhancement of g-C₃N₄ Photocatalysis by Selectively Anchoring Metal Cocatalysts with a Strong Metal–Support Interaction

Enhancement of g-C₃N₄ Photocatalysis by Selectively Anchoring Metal Cocatalysts with a Strong Metal–Support Interaction

Rapid Oxidation of Ammonia Nitrogen to Nitrogen Gas by UV-Activated Persulfate with Calcium Oxide

Large-Scale Synthesis of Iron Ore@Biomass Derived ESBC to Degrade Tetracycline Hydrochloride for Heterogeneous Persulfate Activation

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Co-activation of persulfate by cation and anion from FeP for advanced oxidation processes

Cited by 48 publications

References 57 publications

Enhancement of g-C3N4 Photocatalysis by Selectively Anchoring Metal Cocatalysts with a Strong Metal–Support Interaction

Enhancement of g-C3N4 Photocatalysis by Selectively Anchoring Metal Cocatalysts with a Strong Metal–Support Interaction

Rapid Oxidation of Ammonia Nitrogen to Nitrogen Gas by UV-Activated Persulfate with Calcium Oxide

Large-Scale Synthesis of Iron Ore@Biomass Derived ESBC to Degrade Tetracycline Hydrochloride for Heterogeneous Persulfate Activation

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Enhancement of g-C₃N₄ Photocatalysis by Selectively Anchoring Metal Cocatalysts with a Strong Metal–Support Interaction

Enhancement of g-C₃N₄ Photocatalysis by Selectively Anchoring Metal Cocatalysts with a Strong Metal–Support Interaction