Single-atom catalysis in advanced oxidation processes for environmental remediation

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(8), P. 5281 - 5322

Published: Jan. 1, 2021

This review presents the recent advances in synthetic strategies, characterisation, and computations of carbon-based single-atom catalysts, as well their innovative applications mechanisms advanced oxidation technologies.

Language: Английский

---

How to Build a Microplastics‐Free Environment: Strategies for Microplastics Degradation and Plastics Recycling

Advanced Science, Journal Year: 2022, Volume and Issue: 9(6)

Published: Jan. 6, 2022

Microplastics are an emergent yet critical issue for the environment because of high degradation resistance and bioaccumulation. Unfortunately, current technologies to remove, recycle, or degrade microplastics insufficient complete elimination. In addition, fragmentation mismanaged plastic wastes in have recently been identified as a significant source microplastics. Thus, developments effective removal methods, well as, plastics recycling strategies crucial build microplastics-free environment. Herein, this review comprehensively summarizes eliminating from highlights two key aspects achieve goal: 1) Catalytic into environmentally friendly organics (carbon dioxide water); 2) catalytic upcycling monomers, fuels, valorized chemicals. The mechanisms, catalysts, feasibility, challenges these methods also discussed. Novel such photocatalysis, advanced oxidation process, biotechnology promising eco-friendly candidates transform benign valuable products. future, more effort is encouraged develop conversion products with efficiency, product selectivity, low cost under mild conditions.

Language: Английский

---

Defects on CoS_2−x: Tuning Redox Reactions for Sustainable Degradation of Organic Pollutants

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 60(6), P. 2903 - 2908

Published: Oct. 24, 2020

Abstract It is important to develop self‐producing reactive oxygen species (ROSs) systems and maintain the continuous effective degradation of organic pollutants. Herein, for first time, a system ultrasound‐treated CoS 2− x mixed with Fe 2+ constructed sustainably release singlet ( 1 O 2 ) various pollutants, including dyes, phenols, antibiotics. Ultrasonic treatment produces defects on surface which promote production ROSs circulation 3+ /Fe . With help Co 4+ /Co exposed , directional conversion superoxide radical − realized. The can degrade pollutants efficiently up 30 days, significantly better than currently recognized CuP (<3 days). Therefore, provides new choice long‐term remediation in controlling large area river pollution.

Language: Английский

---

Atomically Dispersed Cobalt Sites on Graphene as Efficient Periodate Activators for Selective Organic Pollutant Degradation

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(8), P. 5357 - 5370

Published: March 17, 2021

Pollutant degradation via periodate (IO4-)-based advanced oxidation processes (AOPs) provides an economical, energy-efficient way for sustainable pollution control. Although single-atomic metal activation (SMA) can be exploited to optimize the process and understand associated mechanisms governing IO4--based AOPs, studies on this topic are rare. Herein, we demonstrated first instance of using SMA IO4- analysis by employing atomically dispersed Co active sites supported N-doped graphene (N-rGO-CoSA) activators. N-rGO-CoSA efficiently activated organic pollutant over a wide pH range without producing radical species. The species underwent stoichiometric decomposition generate iodate (IO3-) Whereas Co2+ Co3O4 could not drive activation; Co-N coordination exhibited high efficiency. conductive matrix reduced contaminants/electron transport distance/resistance these reactions boosted capacity working in conjunction with centers. N-rGO-CoSA/IO4- system substrate-dependent reactivity that was caused iodyl (IO3·) radicals. Electrochemical experiments decomposed pollutants electron-transfer-mediated nonradical processes, where N-rGO-CoSA/periodate* metastable complexes were predominant oxidants, thereby opening new avenue designing efficient activators selective pollutants.

Language: Английский

---

Selective Electrocatalytic Reduction of Oxygen to Hydroxyl Radicals via 3‐Electron Pathway with FeCo Alloy Encapsulated Carbon Aerogel for Fast and Complete Removing Pollutants

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(18), P. 10375 - 10383

Published: Feb. 19, 2021

We reported the selective electrochemical reduction of oxygen (O2 ) to hydroxyl radicals (. OH) via 3-electron pathway with FeCo alloy encapsulated by carbon aerogel (FeCoC). The graphite shell exposed -COOH is conducive 2-electron for H2 O2 generation stepped 1-electron towards . OH. electrocatalytic activity can be regulated tuning local electronic environment electrons coming from inner alloy. new strategy OH overcomes rate-limiting step over electron transfer initiated reduction-/oxidation-state cycle in Fenton process. Fast and complete removal ciprofloxacin was achieved within 5 min this proposed system, apparent rate constant (kobs up 1.44±0.04 min-1 , which comparable state-of-the-art advanced oxidation processes. degradation almost remains same after 50 successive runs, suggesting satisfactory stability practical applications.

Language: Английский

---

Duet Fe₃C and FeN_x Sites for H₂O₂ Generation and Activation toward Enhanced Electro-Fenton Performance in Wastewater Treatment

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(2), P. 1260 - 1269

Published: Jan. 8, 2021

Heterogeneous electro-Fenton (HEF) reaction has been considered as a promising process for real effluent treatments. However, the design of effective catalysts simultaneous H2O2 generation and activation to achieve bifunctional catalysis O2 toward •OH production remains challenge. Herein, core-shell structural Fe-based catalyst (FeNC@C), with Fe3C FeN nanoparticles encapsulated by porous graphitic layers, was synthesized employed in HEF system. The FeNC@C presented significant performance degradation various chlorophenols at conditions an extremely low level leached iron. Electron spin resonance radical scavenging revealed that key reactive species FeIV would play role neutral conditions. Experimental density function theory calculation dominated positive effect FeNx sites on form •OH. Meanwhile, proved be less pH dependence, high stability, well-recycled materials practical application wastewater purification.

Language: Английский

---

Metal-organic frameworks (MOFs) and their derivatives as emerging catalysts for electro-Fenton process in water purification

Coordination Chemistry Reviews, Journal Year: 2021, Volume and Issue: 451, P. 214277 - 214277

Published: Oct. 25, 2021

Language: Английский

---

High H2O2 selectivity and enhanced Fe2+ regeneration toward an effective electro-Fenton process based on a self-doped porous biochar cathode

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 315, P. 121523 - 121523

Published: May 18, 2022

Language: Английский

---

Boosting the activation of molecular oxygen and the degradation of tetracycline over high loading Ag single atomic catalyst

Water Research, Journal Year: 2021, Volume and Issue: 201, P. 117314 - 117314

Published: May 31, 2021

Language: Английский

---

Enhanced Chlorinated Pollutant Degradation by the Synergistic Effect between Dechlorination and Hydroxyl Radical Oxidation on a Bimetallic Single-Atom Catalyst

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(20), P. 14194 - 14203

Published: Oct. 7, 2021

Chlorinated organic pollutants are highly toxic and widespread in the environment, which cause ecological risk threaten human health. difficult to degrade mineralize by conventional advanced oxidation process as C–Cl bond is resistant reactive oxygen species oxidation. Herein, we designed a bifunctional Fe/Cu bimetallic single-atom catalyst anchored on N-doped porous carbon (FeCuSA-NPC) for electro-Fenton process, chlorinated dechlorinated Cu subsequently oxidized ·OH radical produced from O2 conversion Fe. Benefitting synergistic effect between dechlorination Fe, can be efficiently degraded mineralized. The mass activity pollutant degradation FeCuSA-NPC 545.1–1374 min–1 gmetal–1, excessing highest value of reported electrocatalyst. Moreover, demonstrated pH-universal, long-term stable, environment friendly. This work provides new insight into rational design electrocatalyst efficient removal pollutants.

Language: Английский

---