Transforming goat manure into surface-loaded cobalt/biochar as PMS activator for highly efficient ciprofloxacin degradation

Luo, Jiahuan; Bo, Shufeng; Qin, Yueping; An, Qingda; Xiao, Zuoyi; Zhai, Shangru

doi:10.1016/j.cej.2020.125063

Cited by 269 publications

(53 citation statements)

References 53 publications

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“…The solution pH exerted considerable influences on ROS generation and oxidation of contaminants . As depicted in Figure S8, the 900-Co-PCN/PMS system exhibited the highest CIP removal rate (90.1%) at a natural solution pH of 6.1 (near neutral condition) within 20 min.…”

Section: Resultsmentioning

confidence: 99%

Correlation of Active Sites to Generated Reactive Species and Degradation Routes of Organics in Peroxymonosulfate Activation by Co-Loaded Carbon

Duan

et al. 2021

Environ. Sci. Technol.

278

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Peroxymonosulfate (PMS)-based advanced oxidation processes (PMS-AOPs) as an efficient strategy for organic degradation are highly dependent on catalyst design and structured active sites. However, the identification of the active sites and their relationship with reaction mechanisms for organic degradation are not fully understood for a composite catalyst due to the complex structure. Herein, we developed a family of Co encapsulated in Ndoped carbons (Co-PCN) with tailored types and contents of active sites via manipulated pyrolysis for PMS activation and ciprofloxacin (CIP) degradation, focusing on the correlation of active sites to generated reactive species and degradation routes of organics. The structure−function relationships between the different active sites in Co-PCN catalysts and reactive oxygen species (ROS), as well as bond breaking position of CIP, were revealed through regression analysis and density functional theory calculation. Co−N x , O−CO, CO, graphitic N, and defects in Co-PCN stimulate the generation of 1 O 2 for oxidizing the C−C bond in the piperazine ring of CIP into CO. The substitution of F by OH and hydroxylation of the piperazine ring might be induced by SO 4•− and • OH, whose formation was affected by C−O, Co(0), Co−N x , graphitic N, and defects. The findings provided new insights into reaction mechanisms in PMS-AOP systems and rational design of catalysts for ROS-oriented degradation of pollutants.

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Section: Resultsmentioning

confidence: 99%

Correlation of Active Sites to Generated Reactive Species and Degradation Routes of Organics in Peroxymonosulfate Activation by Co-Loaded Carbon

Duan

et al. 2021

Environ. Sci. Technol.

278

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“…When only 2, 4-DCP and PMS were added to the system, no signal was observed using TEMP and DMPO, which indicated that reaction species can only be produced in large quantities after catalyst activation. TEMP can be used as trapping agents for detecting 1 O 2 (Luo et al 2020). When CoMn-LDH and CoFe-LDH were added to the system with TEMP as the trapping agent, a representative signal with a signal intensity ratio of 1:1:1 was detected (Figure 8(c) and 8(d)), which showed that the PMS was activated and produced a large amount 1 O 2 .…”

Section: Identification Of Reaction Species and Possible Mechanismmentioning

confidence: 96%

Application of CoMn/CoFe layered double hydroxide based on metal–organic frameworks template to activate peroxymonosulfate for 2,4-dichlorophenol degradation

Liu

Wei

Gao

et al. 2021

Water Science and Technology

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Metal-organic frameworks (MOFs) have unique properties and stable structures, which have been widely used as templates/precursors to prepare well developed pore structure and high specific surface area materials. In this article, an innovative and facile method of crystal reorganization was designed by using MOFs as sacrificial templates to prepare a layered double hydroxide (LDH) nano-layer sheet structure through a pseudomorphic conversion process under alkaline conditions. The obtained CoMn-LDH and CoFe-LDH catalysts broke the ligand of MOFs and reorganized the structure on the basis of retaining a high specific surface area and a large number of pores, which had higher specific surface area and well developed pore structure compared with LDH catalysts prepared by traditional methods, and thus provide more active sites to activate peroxymonosulfate (PMS). Due to the unique framework structure of MOFs, the MOF-derived CoMn-LDH and CoFe-LDH catalysts could provide more active sites to activate PMS, and achieve a 2,4-dichlorophenol degradation of 99.3% and 99.2% within 20 minutes, respectively. In addition the two LDH catalysts displayed excellent degradation performance for bisphenol A, ciprofloxacin and 2,4-dichlorophenoxyacetic acid (2,4-D). X-ray photoelectron spectroscopy indicated that the valence state transformation of metal elements participated in PMS activation. Electron paramagnetic resonance manifested that sulfate radical () and singlet oxygen (1O2) were the main species for degrading pollutants. In addition, after the three-cycle experiment, the CoMn-LDH and CoFe-LDH catalysts also showed long-term stability with a slight activity decrease in the third cycle. The phytotoxicity assessment determined by the germination of mung beans proved that PMS activation by MOF-derived LDH catalysts can basically eliminate the phytotoxicity of a 2,4-D solution. This research not only developed high-activity LDH catalysts for PMS activation, but also expanded the environmental applications of MOF derivants.

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“…(3)-( 6)) which inhibited the degradation of OTC [47][48][49][50]. However, the addition of sodium chloride did not inhibit but promote the degradation process, indicating that SO 4…”

Section: The Effect Of Initial Pollutant Concentration and Saltsmentioning

confidence: 98%

“…, respectively, and HSO 5 had stronger oxidation capacity [47], so the catalytic rate of OTC would decrease in alkaline conditions. Moreover, under high pH conditions precipitation of Co (OH) 2 should also occur, which might lead to further degradation of catalytic activity.…”

Section: The Impact Of Phmentioning

confidence: 99%

Peroxymonosulfate activation by Co-doped magnetic Mn3O4 for degradation of oxytetracycline in water

Wang

et al. 2022

Environ Sci Pollut Res

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Co-doped magnetic Mn 3 O 4 was synthesized by the solvothermal method and adopted as an effective catalyst for the degradation of oxytetracycline (OTC) in water.Synergistic interactions between Co-Mn 3 O 4 and Fe 3 O 4 not only resulted in the enhanced catalytic activity through the activation of peroxymonosulfate (PMS) to degrade OTC, but also made Fe 3 O 4 /Co-Mn 3 O 4 easy to be separated and recovered from aqueous solution. 94.2% of OTC could be degraded within 60 min at an initial OTC concentration of 10 mg/L, catalyst dosage of 0.2 g/L and PMS concentration of 10 mM, the high efficiency of which was achieved in a wider pH range of 3.0-10.0.The free radical quenching experiments showed that O 2•radicals and 1 O 2 played the main role in the degradation process. Co 3+ , Co 2+ , Fe 2+ , Fe 3+ , Mn 4+ , Mn 3+ and Mn 2+ on Fe 3 O 4 /Co-Mn 3 O 4 were identified as catalytic sites based on XPS analysis. Eventually, the intermediates of OTC degradation were examined and the possible decomposition pathways were proposed. The excellent catalytic performance of Fe 3 O 4 /Co-Mn 3 O 4 not 2 only came from the fact that the large specific surface area could provide abundant active sites for the activation of PMS, but also the charged redistribution among atoms to accelerate the reduction of metal ions. The high degradation efficiency of OTC in actual water samples indicated that Fe 3 O 4 /Co-Mn 3 O 4 had good potential for practical application.

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Transforming goat manure into surface-loaded cobalt/biochar as PMS activator for highly efficient ciprofloxacin degradation

Cited by 269 publications

References 53 publications

Correlation of Active Sites to Generated Reactive Species and Degradation Routes of Organics in Peroxymonosulfate Activation by Co-Loaded Carbon

Correlation of Active Sites to Generated Reactive Species and Degradation Routes of Organics in Peroxymonosulfate Activation by Co-Loaded Carbon

Application of CoMn/CoFe layered double hydroxide based on metal–organic frameworks template to activate peroxymonosulfate for 2,4-dichlorophenol degradation

Peroxymonosulfate activation by Co-doped magnetic Mn3O4 for degradation of oxytetracycline in water

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