Determining the key factors of nonradical pathway in activation of persulfate by metal-biochar nanocomposites for bisphenol A degradation

Luo, Haoyu; Lin, Qintie; Zhang, Xiaofeng; Huang, Zhuofan; Fu, Hengyi; Xiao, Rongbo; Liu, Shuangshuang

doi:10.1016/j.cej.2019.123555

Cited by 61 publications

(14 citation statements)

References 51 publications

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“…Conventional free radical oxidation systems usually require excessive catalysts and oxidants for complete removal of contaminants because of the existence of nontarget background substances and pollutants. , Nevertheless, nonradical oxidation can alleviate the unnecessary consumption of oxidants to achieve a high utilization efficiency of PDS . To better explain the superiority of the e-CuO@BC/PDS system, three experiments were conducted to reveal the selectivity of e-CuO@BC/PDS for pollutant oxidation: (i) the degradation of organics with different electron densities; (ii) the degradation of chlorophenols with different amounts of substituted chlorine (i.e., from 1 to 3); and (iii) the degradation of chlorobenzene containing amido groups and phenolic hydroxyl groups.…”

Section: Resultsmentioning

confidence: 99%

Selective Degradation of Electron-Rich Organic Pollutants Induced by CuO@Biochar: The Key Role of Outer-Sphere Interaction and Singlet Oxygen

Zhao

Lei

Song

et al. 2022

Environ. Sci. Technol.

148

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Efficient degradation of organic pollutants by oxidative radicals is challenging in the complex soil environment because of the invalid consumption of radicals by nontarget background substances and the generation of secondary halogenated organic pollutants. Nonradical-based oxidation is a promising pollutant removal method due to its high selectivity and environmental adaptability. Herein, a biochar-supported sheetlike CuO (e-CuO@BC) was developed, which exhibited efficient activation of peroxydisulfate (PDS) via nonradical pathways. The activation mechanisms were identified as (i) formation of surface-bonding active complexes via an outer-sphere interaction between e-CuO@BC and PDS and (ii) the continuous generation of 1O2 by the cycling of the Cu(I)/Cu(II) redox couple. In addition, the activation of PDS primarily occurred at the crystal facet (001) of e-CuO occupied by Cu atoms and was well facilitated by the Cu–O–C bond, which induced electron-rich centers around CuO. Two oxidative species from PDS activation, including surface-bonding active complexes and 1O2, showed a highly selective degradation toward electron-rich pollutants. Moreover, a highly efficient mineralization of organic pollutants and an effective inhibition on the generation of toxic byproducts (i.e., halogenated organics) was indicated by the intermediate and final degradation products. This study provides a comprehensive understanding of the heterogeneous activation process of PS by the e-CuO@BC catalyst for electron-rich organic pollutant removal.

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Section: Resultsmentioning

confidence: 99%

Selective Degradation of Electron-Rich Organic Pollutants Induced by CuO@Biochar: The Key Role of Outer-Sphere Interaction and Singlet Oxygen

Zhao

Lei

Song

et al. 2022

Environ. Sci. Technol.

148

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“…All the above analysis indicates that there are abundant functional groups in BC-IM, which is consistent with the FT-IR results. Next, the Fe2p peaks could be deconvoluted into some characteristic peaks, among which the four peaks at 726.0, 724.4, 712.9, and 711.2 eV belong to Fe 3+ and the two peaks at 723.3 and 710.1 eV belong to Fe 2+ [ 47 , 48 ]. The results showed that BC-IM has multivalent iron elements.…”

Section: Resultsmentioning

confidence: 99%

Modified Bamboo Charcoal as a Bifunctional Material for Methylene Blue Removal

Liu

Deng

Zhang³

et al. 2023

Materials

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Biomass-derived raw bamboo charcoal (BC), NaOH-impregnated bamboo charcoal (BC-I), and magnetic bamboo charcoal (BC-IM) were fabricated and used as bio-adsorbents and Fenton-like catalysts for methylene blue removal. Compared to the raw biochar, a simple NaOH impregnation process significantly optimized the crystal structure, pore size distribution, and surface functional groups and increase the specific surface area from 1.4 to 63.0 m2/g. Further magnetization of the BC-I sample not only enhanced the surface area to 84.7 m2/g, but also improved the recycling convenience due to the superparamagnetism. The maximum adsorption capacity of BC, BC-I, and BC-IM for methylene blue at 328 K was 135.13, 220.26 and 497.51 mg/g, respectively. The pseudo-first-order rate constants k at 308 K for BC, BC-I, and BC-IM catalytic degradation in the presence of H2O2 were 0.198, 0.351, and 1.542 h−1, respectively. A synergistic mechanism between adsorption and radical processes was proposed.

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“…EtOH was a commonly used scavenger for both HO • (k = 1.6–7.8 × 10 7 M −1 s −1 ) and SO 4 •− (k = 1.2–2.8 × 10 9 M −1 s −1 ) ( Zhou et al, 2020 ), while TBA and IPA were both effective quenchers for HO • ( Du et al, 2020a ). O 2 •− and 1 O 2 were often quenched by p-BQ (k = 0.9–1 × 10 9 M −1 s −1 ) ( Lyu et al, 2019 ) and L-His (k = 3.2 × 10 7 M −1 S −1 ) ( Luo et al, 2020 ), respectively. As shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

Effective degradation of COVID-19 related drugs by biochar-supported red mud catalyst activated persulfate process: Mechanism and pathway

Guo

Zhang

Gan

et al. 2022

Journal of Cleaner Production

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Determining the key factors of nonradical pathway in activation of persulfate by metal-biochar nanocomposites for bisphenol A degradation

Cited by 61 publications

References 51 publications

Selective Degradation of Electron-Rich Organic Pollutants Induced by CuO@Biochar: The Key Role of Outer-Sphere Interaction and Singlet Oxygen

Selective Degradation of Electron-Rich Organic Pollutants Induced by CuO@Biochar: The Key Role of Outer-Sphere Interaction and Singlet Oxygen

Modified Bamboo Charcoal as a Bifunctional Material for Methylene Blue Removal

Effective degradation of COVID-19 related drugs by biochar-supported red mud catalyst activated persulfate process: Mechanism and pathway

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