Research Prospect of Single-Atom Catalysts for Fenton-Like Water Treatment

doi:10.19894/j.issn.1000-0518.230310

Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (2): 217-229.DOI: 10.19894/j.issn.1000-0518.230310

• Review • Previous Articles

Research Prospect of Single-Atom Catalysts for Fenton-Like Water Treatment

Tian-Li SUN¹, Guo ZHU¹, Hai HE¹, Bing-Kun HUANG², Zhao-Kun XIONG²(), Bo LAI²()

^1.The Second Gas Production Plant of Southwest Branch，Sinopec，Langzhong 637400，China
^2.Sino-German Centre for Water and Health Research，College of Architecture and Environment，Sichuan University，Chengdu 610065，China

Received:2023-10-10 Accepted:2023-12-24 Published:2024-02-01 Online:2024-03-05
Contact: Zhao-Kun XIONG,Bo LAI
About author:laibo@scu.edu.cn
scuxzk@scu.edu.cn;
Supported by:
the National Natural Science Foundation of China(52200105);the Natural Science Foundation of Sichuan Province(2023NSFSC0344)

Abstract

Abstract:

Single-atom catalysts （SACs） have attracted much attention due to their unique structure and properties， especially in terms of maximizing the utilization of atoms and improving the intrinsic catalytic activity. In recent years， SAC-based advanced oxidation processes （AOPs） have become a new field in the environmental field， and have been widely used in the removal of various refractory organic pollutants. In this paper， the synthesis and characterization methods of SACs are analyzed， and the catalytic performance of SACs in different Fenton-like catalytic reactions is emphasized. In addition， tests of the continuous flow of SACs fixed on membrane or columnar filters are presented to explore the potential of SACs for practical applications in Fenton-like reactions. Finally， we prospect the future rational SACs design and the exploration direction of the Fenton-like reaction mechanism， aiming to improve the application potential of Fenton-like reaction in practical wastewater.

Key words: Single-atom catalysts, Fenton-like reaction, Degradation of pollutants

CLC Number:

O643.3

Tian-Li SUN, Guo ZHU, Hai HE, Bing-Kun HUANG, Zhao-Kun XIONG, Bo LAI. Research Prospect of Single-Atom Catalysts for Fenton-Like Water Treatment[J]. Chinese Journal of Applied Chemistry, 2024, 41(2): 217-229.

Figures/Tables 7

Fig.1 （a） High-angle annular dark field scanning transmission electron microscopy （HAADF-STEM） images and high-resolution HAADF-STEM images （insets） of Pd-nanoparticles@ZIF-8， intermediate Ⅰ， intermediate Ⅱ and Pd single atoms［24］；（b） Schematic illustrations of Pt ALD mechanism on graphene nanosheets［27］

Fig.2 （a） HAADF-STEM obtained from SAS-Fe. Scale bar： 2 nm［29］；（b） EXAFS of FeSA-MNC， Fe foil， Fe2O3 and FePc［30］

Fig.3 （a） Energy profiles of Co（Ⅳ）O formation for CoN6/PMS and CoN5O1/PMS systems； *O represents the reactive species of Co（?Ⅳ??）?O［36］；（b） The proposed reaction mechanisms of Vis/TiFeAS/PMS system［37］；（c） Schematic illustration of a local electric field-induced coupled electron-proton transfer process promoting the conversion of high-valent metal-oxo species［38］；（d） Relationship between spin states and Fenton-like catalytic activity of transition metals［39］

Fig.4 （a） Scheme diagram proposed for the Fenton-like reaction mechanism of C3N4-Fe-rGO/PDS［4］?；（b） The degradation performance during cycles of solution with different pH conditions， with C3N4-Fe-rGO as the catalyst［4］；（c） Depiction of Cu1-Cu1 distance manipulation for PDS adsorption and activation［41］；（d） First-order rate constants and TOFs of BPA removal by Cu1/NG with different Cu site densities activating PDS［41］??；（e） Electron density difference for PDS adsorption on 2Cu-N4 and Cu-N4 and the corresponding charge transfer. Yellow and cyan contours stand for electron accumulation and deletion， respectively［41］

Fig.5 （a） Photo and SEM image of the filter medium. Scale bar： 100 μm. Inset， magnified SEM image showing the Cu-C3N4 catalyst coated on the surface of a carbon fibre. Scale bar： 5 μm［44］?；（b） Dye removal and Cu concentration in effluent as functions of filtration time［44］?；（c） Charge density differences of FeN5 and FeN4 models. The yellow and skyblue regions represent electron accumulation and electron depletion， respectively［45］；（d） Energy diagram of the reaction process for FeN5 and FeN4 models［45］?；（e） Degradation of select organic pollutants in FeN4/NG+H2O2， FeN5/NG+H2O2， conventional homogeneous Fenton （Fe2++H2O2） and control （H2O2） systems［45］

Fig.6 （a） Comparison between the apparent rate constants of g-C3N4 and FeCN （inset： TOC result）?［49］；（b） Full-scan chromatogram of CH3COO?-TEMPO［49］；（c） Mass spectral analyses of the 18O-labeled or unlabeled PMSO2 generated in the FeCN+PAA system［49］；（d） Degradation of 4-CP by IO4- activated using different activators［50］；（e） Initial solution pH on the degradation of 4-CP in the N-rGO-CoSA IO4- system［50］；（f） Current response after the sequential addition of IO4- and 4-CP at the working electrode coated with the N-rGO-CoSA powder. The inset shows the EIS profiles of the N-rGO-CoSA and N-rGO-800 electrodes in the electrolyte solution［50］；（g） Substrate dependence diagram in Fe5-NC/O3 system［51］；（h） Dynamic processes simulated by AIMD［51］；（i） Relative energy profile calculated by DFT in the interaction of O3 and the Fe-N4 site［51］

Fig.7 （a） Pilot device and effect of Cu-SA in continuous flow unit［55］；（b） BPA removal in deionized water and secondary effluent of WWTP with Fe-CNW3 coated membrane filter under continuous flow. Inset is the HADDF-STEM image of Fe-CNW3 after the reaction［59］；（c） Schematic and photograph of the catalytic membrane （effective area of 3.1 cm2） are installed and the dead-end filtration cell for micropollutant removal. APAP is selected as a model micropollutant［60］；（c） APAP removal efficiency by the catalytic membranes during filtration［60］

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Research Prospect of Single-Atom Catalysts for Fenton-Like Water Treatment

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