Shape-controlled Co 3 O 4 catalysts for advanced oxidation of phenolic contaminants in aqueous solutions

Saputra, Edy; Duan, Xiaoguang; Pinem, Jhon Armedi; Bahri, Syaiful; Wang, Shaobin

doi:10.1016/j.seppur.2017.02.057

Cited by 37 publications

(4 citation statements)

References 19 publications

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“…In this study, phenol was selected as the aim pollutant because it is one of the most common industrial wastewater contaminates and would cause serious ecological and environmental problems [27]. The phenol degradated by catalytic ozonation was performed in a self-regulating quartz reaction with 1 L aqueous solution showed in Fig.…”

Section: Catalytic Ozonation Activitiesmentioning

confidence: 99%

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Zhang

Dong

Han

et al. 2022

Environmental Engineering Research

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In this paper, Cobalt-doped α-MnO2 (i.e., Co-α-MnO2) were synthesized through hydrothermal method. Phenol was employed as targeted pollutants to investigate the catalytic ozonation performance of Co-α-MnO2. Results showed that Co-α-MnO2 significantly improved the phenol removal increased to 97.47 % after 40 min, which was 16.46 %, 38.92 % higher than that of α-MnO2 catalytic ozonation and single ozonation without catalyst. Additionally, the physicochemical properties of α-MnO2 and Co-α-MnO2 were analyzed using technologies such as XRD, TEM, BET and XPS. Compared to α-MnO2, Co-α-MnO2 has larger specific surface area (79.496 m 2 /g) and pore volume (0.0396 cm 3 /g), higher Mn 3+ relative content (41.16 %) and adsorbed oxygen content (18.99 %). Also, the oxygen vacancy content, lattice defect content and surface hydroxyl content of Co-α-MnO2 are higher than that of α-MnO2, which could result in higher catalytic oxidation performance of Co-α-MnO2. The influence of masking agent showed that surface hydroxyl group, •OH and •O 2were involved in the catalytic ozonation of phenol. This study could help recognize the role of surface hydroxyl groups and active free radicals and demonstrate the contribution of reactive oxygen species on phenol removal in Co-α-MnO2 systems.

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Section: Catalytic Ozonation Activitiesmentioning

confidence: 99%

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Zhang

Dong

Han

et al. 2022

Environmental Engineering Research

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show abstract

“…In this study, phenol was selected as the aim pollutant because it is one of the most common industrial wastewater contaminates and would cause serious ecological and environmental problems (Saputra et al, 2017). The phenol degradated by catalytic ozonation was performed in a self-regulating quartz reaction with 1 L aqueous solution showed in Fig.…”

Section: Catalytic Ozonation Activitiesmentioning

confidence: 99%

Catalytic Ozonation for Phenol Removal over Cobalt-doped α-MnO2 Catalyst: Performance and Mechanism

Zhang

Dong

Han

et al. 2022

Preprint

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In this paper, Cobalt-doped α-MnO2 (i.e., Co-α-MnO2) were synthesized through hydrothermal method. Phenol was employed as targeted pollutants to investigate the catalytic ozonation performance of Co-α-MnO2 in terms of catalytic ability and mechanism. Results showed that that Co doped on α-MnO2 significantly improved the phenol removal increased to 97.47 % after 40 min, which was 16.46 %, 38.92 % higher than that of α-MnO2 catalytic ozonation and single ozonation without catalyst. In order to investigate the effect of Co doping on the physicochemical properties of the catalysts, the synthesized α-MnO2 and Co-α-MnO2 (2% Co/Mn doping ratio) catalysts were characterized by XRD, TEM, BET and XPS techniques, including the phase, morphology, structural properties and dispersity of the surface active species. The larger specific surface area and pore volume, more crystal defect and oxygen vacancy, higher relative content of Mn3+ and adsorbed oxygen (Oads) as well as surface hydroxyl were obtained after Co doping on α-MnO2, which could result in higher catalytic oxidation performance of Co-α-MnO2. The influence of masking agent showed that surface hydroxyl group and active free radicals (•OH and •O2-) were involved in the catalytic ozonation of phenol. This study could help recognize the role of surface hydroxyl groups and active free radicals and demonstrate the contribution of reactive oxygen species (ROS) on phenol removal in Co-α-MnO2 systems.

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“…The crystalline structure and morphology of heterogeneous catalysts play an increasingly important role in their ultimate catalytic activity. Although progress has been made in the development of cobaltosic oxide or modified Co 3 O 4 nanomaterials for activating PMS to degrade organic pollutants, − to our knowledge, there are only very few available reports on the crystal facet effect of Co 3 O 4 with different morphologies in the removal of organic pollutants. − As part of our research on sewage treatment, − herein, we had first compared the catalytic activities of Co 3 O 4 cubes (Co 3 O 4 -c), Co 3 O 4 octahedron (Co 3 O 4 -o), and Co 3 O 4 truncated octahedron (Co 3 O 4 -t) in the degradation of oxytetracycline (OTC) via PMS activation. Among them, Co 3 O 4 -c and Co 3 O 4 -o were enclosed with {100} resp.…”

Section: Introductionmentioning

confidence: 99%

Co₃O₄ Nanocubes for Degradation of Oxytetracycline in Wastewater via Peroxymonosulfate Activation

Huang

Jin

et al. 2023

ACS Appl. Nano Mater.

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Despite significant progress being made in the development of cobaltosic oxide or modified cobaltosic oxide nanomaterials in the degradation of organic pollutants, to our knowledge, there are only very few available reports on the crystal facet effect of Co 3 O 4 with different morphologies on peroxymonosulfate activation for oxytetracycline degradation. Herein, we first reported the synthesis of three kinds of Co 3 O 4 nanocomposites with various morphologies, including nanocubes (Co 3 O 4 -c), octahedron (Co 3 O 4 -o), and truncated octahedron (Co 3 O 4 -t), for activating peroxymonosulfate (PMS) in the degradation of oxytetracycline at 30 °C. The detailed physical characterizations illustrated that Co 3 O 4 -c, Co 3 O 4 -o, and Co 3 O 4 -t possessed a uniform morphology of nanocubes, octahedron, and truncated octahedron, with six {100} exposing facets, six {111} exposing facets, and a mixture of eight {111} and six {100} exposing facets, respectively. In particular, the optimal Co 3 O 4 nanocubes (Co 3 O 4 -c) presented the highest catalytic reactivity in the activation of PMS for OTC degradation, with 82.8% degradation efficiency and 46.4% mineralization rate at 30 °C. The DFT results exhibited that the ΔE total of PMS on Co 3 O 4 {100} exposing facets (−23.7 eV) was much lower than that of PMS on Co 3 O 4 exposing {111} facets (−17.2 eV), indicating that PMS activation was more likely to occur at the Co 3 O 4 {100} exposing facets, which was in good accordance with the above experimental conclusion. Overall, the explanation of the crystal facet effects on PMS activation proposes a research orientation for the synthesis of crystal engineering of heterogeneous catalysts on wastewater treatment.

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Shape-controlled Co 3 O 4 catalysts for advanced oxidation of phenolic contaminants in aqueous solutions

Cited by 37 publications

References 19 publications

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Catalytic Ozonation for Phenol Removal over Cobalt-doped α-MnO2 Catalyst: Performance and Mechanism

Co₃O₄ Nanocubes for Degradation of Oxytetracycline in Wastewater via Peroxymonosulfate Activation

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Shape-controlled Co 3 O 4 catalysts for advanced oxidation of phenolic contaminants in aqueous solutions

Cited by 37 publications

References 19 publications

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Catalytic Ozonation for Phenol Removal over Cobalt-doped α-MnO2 Catalyst: Performance and Mechanism

Co3O4 Nanocubes for Degradation of Oxytetracycline in Wastewater via Peroxymonosulfate Activation

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Product

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Co₃O₄ Nanocubes for Degradation of Oxytetracycline in Wastewater via Peroxymonosulfate Activation