Atomically dispersed Fe/Bi dual active sites single-atom nanozymes for cascade catalysis and peroxymonosulfate activation to degrade dyes

Chen, Qiumeng; Liu, Yuan; Lu, Yuwan; Hou, Yuejie; Zhang, Xiaodan; Shi, Wenbing; Huang, Yuming

doi:10.1016/j.jhazmat.2021.126929

Cited by 95 publications

(34 citation statements)

References 49 publications

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“…) , or other weight combinations of bimetallic oxides, − the Fe site was shown to be able to offer synergistic effects including enhanced pollutant adsorption, strong metal–metal magnetic interactions, − and facilitation of the redox cycle of the neighboring active metal ( e.g ., Fe 2+ + Cu 3+ → Fe 3+ + Cu 2+ , Fe 2+ + Mn 3+ → Fe 3+ + Mn 2+ ). Similarly, some recent studies have made early efforts in designing bimetallic SACs for PMS activations ( e.g ., Co–Fe, Bi–Fe), , yet the synergistic effects from two SACs require further investigation. The accurate control of material morphology would be a critical step, as to how two SACs are spatially distributed and how they collaborate toward synergistic effects ( e.g ., enhancing redox cycle).…”

Section: Challenges and Research Directionsmentioning

confidence: 99%

Outlook on Single Atom Catalysts for Persulfate-Based Advanced Oxidation

Kim

2022

ACS EST Eng.

106

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Single atom catalysts (SACs) have emerged as a promising catalyst material architecture for energy, chemical, and environmental applications. In the past several years, SACs have been increasingly explored for persulfate-based advanced oxidation processes (AOPs) due to their superior persulfate activation and pollutant degradation performance compared to benchmark dissolved ion and nanoparticle catalysts. However, there still exist uncertainties on the mechanism of persulfate activation by SACs, which involves a complex interplay of sulfate and hydroxyl radicals, singlet oxygen, high-valent metal species, and/or mediated electron transfer. Questions also remain as to how persulfate ions molecularly align on the single atom site, how persulfate ions are converted into reactive species, and what design parameters lead to higher efficiency for persulfate activation and pollutant degradation. In this critical review, we examine past SAC materials employed for persulfate-based AOPs and discuss how they function differently compared to their ion and nanoparticle counterparts. We further our discussion on current limitations, opportunities, and future research needs in (i) filling the knowledge gaps in the mechanisms of persulfate-SAC interactions; (ii) augmenting fundamental research with theoretical simulation and in situ characterization techniques; (iii) improving material design tailored for environmental applications; and (iv) proactively considering the challenges associated with engineering practices and complex water matrixes.

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Section: Challenges and Research Directionsmentioning

confidence: 99%

Outlook on Single Atom Catalysts for Persulfate-Based Advanced Oxidation

Kim

2022

ACS EST Eng.

106

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“…Therefore, the improvement of catalytic activity of nanozymes is beneficial for their widespread application in agriculture. One of the methods to improve the catalytic activity of nanozymes is to increase the density of their active sites . Recently, single-atom nanozymes (SAzymes) have become an innovative tool for mimicking nanozymes with high performance via integrating single-atom technology with enzyme-mimicking catalytic active sites .…”

Section: Prospectsmentioning

confidence: 99%

Lighting Up Agricultural Sustainability in the New Era through Nanozymology: An Overview of Classifications and Their Agricultural Applications

Cui

Zhang

et al. 2022

J. Agric. Food Chem.

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With the concept of sustainable agriculture receiving increasing attention from humankind, nanozymes, nanomaterials with enzyme-like activity but higher environmental endurance and longer-term stability than natural enzymes, have enabled agricultural technologies to be reformative, economic, and portable. Benefiting from their multiple catalytic activities and renewable nanocharacteristics, nanozymes can shine in agricultural scenarios using enzyme engineering and nanoscience, acting as sustainable toolboxes to improve agricultural production and reduce the risk to agricultural systems. Herein, we comprehensively discuss the classifications of nanozymes applied in current agriculture, including peroxidase-like, oxidase-like, catalase-like, superoxide dismutase-like, and laccase-like nanozymes, as well as their biocatalytic mechanisms. Especially, different applications of nanozymes in agriculture are deeply reviewed, covering crop protection and nutrition, agroenvironmental remediation and monitoring, and agroproduct quality monitoring. Finally, the challenges faced by nanozymes in agricultural applications are proposed, and we expect that our review can further enhance agricultural sustainability through nanozymology.

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“…At present, the MOF precursors for the production of Fenton-like catalysts, which have been applied to nitrogen-doped carbon precursors to disperse single metal atoms, mainly include Prussian blue analogue (PBA, A x M 1 [M 2 (CN) 6 ] y · z H 2 O), 73 zeolite imidazole frameworks (ZIF-8 and ZIF-67), 74 and Fe-based frameworks (MIL-101 and MIL-88). 75–78…”

Section: Single-atom Catalyst Design Principlementioning

confidence: 99%

“…Chen et al used an Fe-doped Bi-MOF as a precursor to design and synthesize a FeBi-NC Fenton-like catalyst with double active centers, which had an ultra-high monatomic loading (FeBi-MOF, 2.61 wt% Fe and 8.01 wt% Bi). 77 The highlight of its design was that the introduced Fe not only acted as the active site, but also expanded the distance between adjacent Bi atoms in FeBi-MOF like a “fence”, thus maximizing the dispersion of metals in the pyrolysis process (Fig. 5a).…”

Section: Single-atom Catalyst Design Principlementioning

confidence: 99%