Efficient Ofloxacin degradation with Co(Ⅱ)-doped MoS2 nano-flowers as PMS activator under visible-light irradiation

Chen, Peng; Gou, Yejing; Ni, Jiaming; Liang, Yumeng; Yang, Bingqiao; Jia, Feifei; Song, Shaoxian

doi:10.1016/j.cej.2020.125978

Cited by 206 publications

(36 citation statements)

References 41 publications

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“…The high-resolution XPS spectrum of Mo 3d showed two peaks at 232.69 and 229.53 eV, which are ascribed to Mo 3d 3/2 and Mo 3d 5/2 of MoS 2, respectively Besides, slight surface oxidation of DR-MoS 2 -4 NFs is detected, due to the appearance of MoO 3 peaks at 235.38 eV (Figure c) . For the S 2p spectrum, two peaks located at 163.60 and 162.34 eV (Figure d) are ascribed to S 2p 1/2 and S 2p 3/2 , respectively, while after the reaction, only a slight negative shift (0.07 eV) of Mo 3d peaks is observed, due to the interaction between Au(S 2 O 3 ) 2 3– and the exposed Mo(IV) of MoS 2 .…”

Section: Resultsmentioning

confidence: 93%

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Chen

Liang

et al. 2020

ACS Sustainable Chem. Eng.

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To achieve a more efficient gold recovery from a thiosulfate solution, piezo-photocatalytic reduction of Au(I) with defect-rich MoS 2 nanoflowers (DR-MoS 2 NFs) as a catalyst was proposed in this work. Superior piezoelectric response of DR-MoS 2 is detected by a piezoresponse force microscopy (PFM) measurement, revealing the excellent spontaneous polarization of DR-MoS 2 under an external force. Ultrafast Au(I) reduction is realized by DR-MoS 2 NFs with the aid of ultrasonic treatment under indoor light, which is attributed to the decline of the Schottky barrier in the Au/MoS 2 interface and the quick separation of photogenerated carriers induced by the piezoelectric potential. Furthermore, the edge sites and S defects of MoS 2 are directly proven to be the active sites for Au(I) reduction through the transmission electron microscopy (TEM) measurement, while the edge sites play a dominant role. This work may promote the development of piezo-photocatalysis and facilitate the substitution of environmentally friendly thiosulfate leaching to cyanidation.

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Section: Resultsmentioning

confidence: 93%

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Chen

Liang

et al. 2020

ACS Sustainable Chem. Eng.

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“…•radical is produced via peroxymonosulfate (PMS) activation with various activation methods, such as heat [23], UV [24,25], electro-activation [26], transition metal [27,28] and ultrasound [29]. The transition metal activation is usually used because of its low equipment requirements, low cost and more flexibility.…”

Section: Introductionmentioning

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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“…2,[4][5][6] PMS commonly can be activated by UV, heat, ultrasonication, and transition metal ions. [7][8][9] Among these methods, transition metals have always been considered to be effective and feasible activators due to their low cost and easy operation. 10 Conventional cobalt-based materials show high efficiency of activating PMS, but the leached cobalt ions are carcinogenic.…”

Section: Introductionmentioning

confidence: 99%

A new FeOCl/graphene quantum dot catalyst for peroxymonosulfate activation to efficiently remove organic pollutants and inactivate Escherichia coli

et al. 2022

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Efficient Ofloxacin degradation with Co(Ⅱ)-doped MoS2 nano-flowers as PMS activator under visible-light irradiation

Cited by 206 publications

References 41 publications

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

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

A new FeOCl/graphene quantum dot catalyst for peroxymonosulfate activation to efficiently remove organic pollutants and inactivate Escherichia coli

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Efficient Ofloxacin degradation with Co(Ⅱ)-doped MoS2 nano-flowers as PMS activator under visible-light irradiation

Cited by 206 publications

References 41 publications

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS2 Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS2 Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

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

A new FeOCl/graphene quantum dot catalyst for peroxymonosulfate activation to efficiently remove organic pollutants and inactivate Escherichia coli

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Product

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Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution

Piezo-Photocatalytic Reduction of Au(I) by Defect-Rich MoS₂ Nanoflowers for Efficient Gold Recovery from a Thiosulfate Solution