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Chao Liu

Bio: Chao Liu is an academic researcher from Sichuan University. The author has contributed to research in topics: Chemistry & Catalysis. The author has an hindex of 15, co-authored 43 publications receiving 737 citations. Previous affiliations of Chao Liu include Xuzhou Institute of Technology & Beijing Forestry University.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this article, high-efficient N-doped carbon materials were prepared by direct carbonization of polyaniline (PANI) at 700 °C-1000 °C.
Abstract: N-doped carbonaceous materials are promising efficient catalysts for peroxymonosulfate (PMS) activation In this study, the high-efficient N-doped carbon materials were prepared by direct carbonization of polyaniline (PANI) at 700 °C–1000 °C It was optimized that the CPANI-9 (carbonized polyaniline prepared at 900 °C) exhibited excellent catalytic performance to activate PMS for phenol degradation, which was efficient over a wide pH range (pH 35∼9) In the CPANI-9/PMS system, the PMS adsorption/activation was identified as the key step determining the reaction rate The quenching experiments and electron paramagnetic resonance demonstrated that the non-radical pathway was dominant in phenol degradation and singlet oxygen (1O2) was the main active specie Graphitic N, pyridinic N, defects and ketonic groups (C O) were identified as catalytic sites Interestingly, only the presence of PO43− greatly decreased the phenol degradation rate and PMS decomposition The CPANI-9/PMS system could also degrade effectively various organic pollutants, indicating that it had potential practical application

218 citations

Journal ArticleDOI
TL;DR: In this article, a highly active mediator (Fe@N-doped graphene-like carbon) for peroxymonosulfate (PMS) activation was prepared by employing g-C3N4 assisting NH2-MIL-53(Fe) as the precursor.
Abstract: A highly active mediator (Fe@N-doped graphene-like carbon) for peroxymonosulfate (PMS) activation was prepared by employing g-C3N4 assisting NH2-MIL-53(Fe) as the precursor. The addition of combined nitrogen sources (g-C3N4 and NH2 groups) not only stabilized the phase composition and framework morphology, but also improved PMS activation performance significantly. In addition, the introduction of g-C3N4 increased the surface area. Electron paramagnetic resonance (EPR) spectroscopy and radical quenching experiments identified singlet oxygen (1O2), superoxide radicals (O2•−), hydroxyl radicals (•OH), and sulfate radicals (SO4•−) as the reactive oxygen species (ROS) in 4-aminobenzoic acid ethyl ether (ABEE) degradation via a combination process of nonradical and radical processes. The variable chemical valences of iron nanoparticles and quaternary-N, pyrrolic-N, pyridinic-N, and carbonyl (C=O) groups in the support contributed to the outstanding catalytic activity. A possible mechanism for PMS activation by Fe@N-doped graphene-like carbon for ABEE degradation was proposed, which involved sp2 hybridized carbon and electron-rich sp2 sites of the graphitic domain activating PMS via electron transfer. Intermediates were identified using liquid chromatography-quadrupole time-of-flight mass spectrometry (LC-Q-TOF-MS). The degradation pathway of ABEE was reported for the first time in the advanced oxidation process field. Based on intermediate identification of sulfamethoxazole (SMX) degradation, six intermediates were first reported and a new reaction pathway established. This work provides a promising approach to the rational design of high-performance active mediators for environmental remediation.

175 citations

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TL;DR: In this paper, a green heterogeneous catalyst for the degradation of refractory drugs in municipal wastewater/groundwater by peroxymonosulfate (PMS) activation was proposed.

135 citations

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TL;DR: In this article, the role of NH2-group incorporation on the development of structure and physical-chemical properties of obtained Fe@porous carbon, and reaction mechanism for peroxymonosulfate (PMS) activation for refractory organic chemical degradation from aqueous.

129 citations

Journal ArticleDOI
TL;DR: Roles of chemical functional groups, doped atoms, free electron, and delocalized π electron of heteroatom-doped graphene in catalytic ozonation were identified, and contributions of these active centers to the formation of reactive oxygen species (ROS) were evaluated.
Abstract: To guide the design of novel graphene-based catalysts in catalytic ozonation for micropollutant degradation, the mechanism of catalytic ozonation with heteroatom-doped graphene was clarified. Reduced graphene oxide doped with nitrogen, phosphorus, boron, and sulfur atoms (N-, P-, B-, and S-rGO) were synthesized, and their catalytic ozonation performances were evaluated in the degradation of refractory organics and bromate elimination simultaneously. Doping with heteroatoms, except sulfur, significantly improved the catalytic ozonation activity of graphene. Introducing sulfur atoms destroyed the stability of graphene during ozonation, with the observed partial performance improvement caused by surface adsorption. Degradation pathways for selected refractory organics were proposed based on the intermediates identified using high-resolution Orbitrap mass spectroscopy and gas chromatographic-mass spectroscopy. Three and six new unopened intermediates were identified in benzotriazole and p-chlorobenzoic acid degradation, respectively. Roles of chemical functional groups, doped atoms, free electron, and delocalized π electron of heteroatom-doped graphene in catalytic ozonation were identified, and contributions of these active centers to the formation of reactive oxygen species (ROS), including hydroxyl radicals, superoxide radicals, singlet oxygen, and H2O2, were evaluated. A mechanism for catalytic ozonation by heteroatom-doped graphene was proposed for the first time.

128 citations


Cited by
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Journal ArticleDOI
TL;DR: A survey of 40 research efforts that employ deep learning techniques, applied to various agricultural and food production challenges indicates that deep learning provides high accuracy, outperforming existing commonly used image processing techniques.

2,100 citations

Journal ArticleDOI
TL;DR: In this article, the up-to-date research progresses of iron-mediated activation of persulfate and peroxymonosulfate mediated by these iron-based species in both homogeneous and heterogeneous ways are summarized and discussed.

491 citations

Journal ArticleDOI
TL;DR: Several key aspects of catalytic ozonation, such as pH effect, the catalyst performance, the catalytic mechanism were proposed, to which more attention should be paid in future study.

487 citations

Journal ArticleDOI
TL;DR: In this paper, the authors summarize the rapid development of various heterogeneous catalysts developed for peroxymonosulfate (PMS) activation, destined for the degradation of organic contaminants.

343 citations