Fenton-like activity and pathway modulation via single-atom sites and pollutants comediates the electron transfer process

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(3)

Published: Jan. 8, 2024

The studies on the origin of versatile oxidation pathways toward targeted pollutants in single-atom catalysts (SACs)/peroxymonosulfate (PMS) systems were always associated with coordination structures rather than perspective pollutant characteristics, and analysis mechanism commonality is lacking. In this work, a variety (M-SACs, M: Fe, Co, Cu) fabricated via pyrolysis process using lignin as complexation agent substrate precursor. Sixteen kinds commonly detected various references selected, their ln k obs values M-SACs/PMS correlated well ( R 2 = 0.832 to 0.883) electrophilic indexes (reflecting electron accepting/donating ability pollutants) energy gap 0.801 0.840) between complexes. Both transfer (ETP) radical can be significantly enhanced systems, while was overwhelmed by ETP lower indexes. contrast, higher represented weaker electron-donating capacity complexes, which resulted accompanied noticeable oxidation. addition, different regulated gaps complexes pollutants. As result, Fenton-like activities could modulated reaction pathways, determined both sites. This work provided strategy establish PMS-based AOP tunable capacities for high-efficiency organic decontamination.

Language: Английский

---

Migration trajectories and blocking effect of the fine particles in porous media based on particle flow simulation

AIP Advances, Journal Year: 2024, Volume and Issue: 14(4)

Published: April 1, 2024

The particle flow code method based on the discrete element was used to establish seepage migration model of fine particles [fine (FPs), i.e., suspended particles] in a porous medium. A series numerical simulations were carried out by changing size, velocity, injection number, and wide size gradation. research showed that large FPs play major role blocking medium channels when injected have Due effect, small would not otherwise deposited also deposit. Moreover, increasing number mixed particles, total smaller will increase. distribution mediums can be divided into three types: surface deposition, internal non-deposition. When velocity increases reaches threshold, which is critical once again state undergo migration. On contrary, continue maintain their sedimentary state, increase correspondingly with size.

Language: Английский

---

The migration process and temperature effect of aqueous solutions contaminated by heavy metal ions in unsaturated silty soils

Heliyon, Journal Year: 2024, Volume and Issue: 10(9), P. e30458 - e30458

Published: April 27, 2024

Adsorption-desorption experiments of three heavy metal ions (i.e., lead, copper, cadmium) in silty soil were carried out at different temperatures, and the microscopic characteristics loaded with analyzed. A one-dimensional column was used to discuss influences ion types concentrations on moisture distribution migration level ions, especially during dynamic change process from an unsaturated state a saturated state. Studies show that adsorption onto is closely related mineral composition functional groups soil. In addition physical adsorption, hydrolysis reaction components such as kaolinite, calcite, dolomite, plagioclase quartz. Under constant temperature, play important role presence penetration lead greatest, followed by copper then cadmium ions. The greater concentration is, stronger soils.

Language: Английский

---

Temperature-driven coupled transport of pollutants and suspended particles established by granular thermodynamics

International Journal of Heat and Mass Transfer, Journal Year: 2024, Volume and Issue: 228, P. 125645 - 125645

Published: May 2, 2024

Language: Английский

---

Granular Thermodynamic Migration Model Suitable for High‐Alkalinity Red Mud Filtrates and Test Verification

International Journal for Numerical and Analytical Methods in Geomechanics, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 11, 2025

ABSTRACT A theoretical model of the migration process high‐alkalinity red mud particles in porous media was derived from granular thermodynamics, complying with complementary motion two‐phase flows (i.e., hydroxide ions and powder). From perspective energy dissipation provoked by particle molecular thermal motion, a suspended under mixed conditions established. This naturally considers complex adsorption/desorption between (or particles) medium solid matrix, as well particles. Moreover, reveals dynamic deposition effect powder multiphase interactions during temporal spatial variations. The progression substances transient injection filtrate different pH values continuous change were verified experiments.

Language: Английский

---

Rationally tailored synergy between adsorption efficiency of cotton shell activated carbon and PMS activation via biogenic Fe0 or Cu0 for effective mitigation of triphenylmethane dyes

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 342, P. 127010 - 127010

Published: March 6, 2024

Language: Английский

---

Heterogeneous catalytic ozonation of atrazine with oxygen vacancy-rich cu-loaded and ce-loaded attapulgite: Efficiency, mechanism and environmental application

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 486, P. 150079 - 150079

Published: Feb. 29, 2024

Language: Английский

---

Intensify Mass Transfer and Molecular Oxygen Activation by Defect‐Bridged Asymmetric Catalytic Sites Toward Efficient Membrane‐Based Nanoconfined Catalysis

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(37)

Published: May 7, 2024

Abstract Efficient spontaneous molecular oxygen (O 2 ) activation is expected in advanced oxidation processes. However, it remains a great challenge to promote the reactants adsorption and accelerate interfacial electron transfer boost kinetic of O . Herein, defect‐rich N‐doped reduced graphene oxide/CoFe 4 (NGCF‐O V membrane containing asymmetric Co‐O ‐Fe sites prepared for activation. The intrinsic catalytic activity that regulate O─O bond length, promoting more faster selectively producing 1 Meanwhile, adjacent graphitic N help confine organics surface thus greatly shorten reaction distance improve its utilization efficiency. NGCF‐O demonstrates complete degradation bisphenol A within retention time 86 ms, achieving k‐value 0.047 ms −1 , which exceeds performance most Fenton‐like systems. This work provides new horizons designing an efficient stable membrane, enriching domain wastewater treatment strategies.

Language: Английский

---

Visible-light-promoted peroxymonosulfate activation for ACE degradation: Overlooked role of photogenerated hole

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: unknown, P. 124881 - 124881

Published: Nov. 1, 2024

Language: Английский

---

Porous MnxFe3-xO4 spinel oxides trigger H2O2 activation for boosted degradation of tetracycline: The formation and dominant role of surface-bound radicals

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 347, P. 127555 - 127555

Published: April 17, 2024

Language: Английский

---