Amorphous/crystalline Cu1.5Mn1.5O4 with rich oxygen vacancies for efficiently photothermocatalytic mineralization of toluene

Cheng, Qiang; Yang, Zhixiong; Li, Yuan; Wang, Junting; Wang, Jiquan; Zhang, Gaoke

doi:10.1016/j.cej.2023.144295

Cited by 17 publications

(2 citation statements)

References 56 publications

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“…, oxygen vacancies and unsaturated coordination) lead to high chemical reactivities, such as catalysis and ion storage. 67–74 Oxygen vacancy is one type of well-known defect in crystalline engineering due to the absence of oxygen atoms at their lattice positions. In amorphous materials, the quantity of oxygen vacancies is far more than that in crystals, performing distinctly enhanced functions, especially in catalysis.…”

Section: Amorphous Structure and Its Functional Relationshipmentioning

confidence: 99%

“…In amorphous materials, the quantity of oxygen vacancies is far more than that in crystals, performing distinctly enhanced functions, especially in catalysis. 65–70 Additionally, the design of amorphous electrodes with a combination of oxygen vacancy and disordered structure was capable of enhanced ion storage. In alkali metal ion batteries, storages of Na + and K + in electrodes were restricted by lattice owing to their relatively large atomic radius.…”

Section: Amorphous Structure and Its Functional Relationshipmentioning

confidence: 99%

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Applications of amorphous inorganics as novel functional materials

Guo,

Liu,

Tang

2024

Mater. Chem. Front.

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Section: Amorphous Structure and Its Functional Relationshipmentioning

confidence: 99%

Section: Amorphous Structure and Its Functional Relationshipmentioning

confidence: 99%

Applications of amorphous inorganics as novel functional materials

Guo,

Liu,

Tang

2024

Mater. Chem. Front.

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Heterovalent State and Oxygen Vacancy Defect Structure‐Associated V/S Co‐Doped SnO₂ for Catalytic Reduction of Organic and Cr⁶⁺ Pollutants in the Dark

Yang,

Wu,

et al. 2024

Advanced Sustainable Systems

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V/S co‐doped SnO2 bimetal sulfur‐oxides catalysts labeled as (Sn,V)1‐x(S,O)2‐y or (SnVSO) with heterovalent state and oxygen vacancy defect are prepared via a green and facile method. The presence of SnVSO in the heterovalent states of Sn4+/Sn2+ and V5+/V4+ facilitates the rapid transfer of the electrons. It improves the electronic charge lifetime, accelerating the efficiency of the catalytic reduction of pollutants. The V/S co‐doped SnO2 regulates the bandgap energy structure. The hydrazine adjusts the heterovalent metal states to reduce Sn4+ to Sn2+ and V5+ to V4+. Also, it introduces oxygen vacancies to SnVSO to maintain the charge equilibrium and increase the active surface reactive sites, which enhance the catalytic activity. The SnVSO‐3 prepared with 0.4 mL hydrazine exhibits excellent catalytic activity, which wholly reduces 20 ppm of 100 mL methyl orange (MO), rhodamine B (RhB), methylene blue (MB), hexavalent chromium (Cr6+), and 4‐nitrophenol (4‐NP) within 6 min. In addition, the SnVSO‐3 also has good stability after repeated 6 runs with a reduction efficiency of 96.8%. Therefore, the V/S co‐doped SnO2 sulfur oxide catalysts have a promising potential for reducing Cr6+ and organic pollutants.

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Performance and mechanism analysis of sludge-based biochar loaded with Co and Mn as photothermal catalysts for simultaneous removal of acetone and NO at low temperature

Wang,

Huang,

Liao

et al. 2023

Environ Sci Pollut Res

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A series of sludge-based biochar catalysts with different sludge calcination temperatures and different Co and Mn addition ratios were prepared by a simple hydrothermal synthesis method for the simultaneous removal of acetone and NO in a low-temperature photothermal co-catalytic system with acetone replacing NH 3 . Among them, the catalyst with sludge calcined at 400 ℃ and Co, Mn addition ratios of 4:1 (400@4:1) showed the optimal photothermal catalytic performance, with the conversion of acetone and NO reaching 42.98% and 52.41% at 240 ℃, respectively. The physicochemical properties of each catalyst were analyzed by characterization of SEM, XRD, BET, XPS, FT-IR, H 2 -TPR, O 2 -TPD, UV-vis, and transient photocurrent response (TPC). The effects of speci c surface area, valence and content of Co and Mn atoms, types of surface adsorbed oxygen and lattice oxygen, optical properties, and other factors on the catalytic properties of the catalysts were investigated. A possible mechanism for the catalytic conversion of acetone and NO on the catalyst surface was proposed based on the Mars -van Krevelen (MvK) mechanism. A new strategy is provided for the resource utilization of sewage sludge and the preparation of photothermal catalysts for the simultaneous removal of acetone and NO at low cost.Sewage sludge was collected from Yanshan Wastewater Treatment Plant in Guilin, Guangxi, China, whose in uent was a mixture of domestic wastewater (75%) and industrial wastewater (25%). The sludge was pulverized after dewatering and drying and passed through a 100-mesh sieve. Relevant chemical reagents were of analytical grade. Preparation of sludge-based biochar catalystA suitable amount of sludge after 100 mesh sieve was put into the porcelain boat, and then the porcelain boat was put into the tube furnace, which was heated to 300 ℃, 400 ℃, 500 ℃ with the heating rate of 2 ℃•min − 1 , and continued to calcine for 2 h. The samples were taken out when the samples were reduced to room temperature, and the samples obtained were the sludge-based biocha. Preparation of sludge-based biochar catalysts loaded with Co and MnCo(CH 3 COO) 2 •4H 2 O (1.868 g, 7.500 mmol), Mn(CH 3 COO) 2 •4H 2 O(0.459 g, 1.875 mmol) and H4dhtp (2,5dihydroxyterephthalic acid) (0.743 g, 3.750 mmol) were added to a solution of 75 mL of DMF (N, Ndimethylformamide ): EtOH (ethanol): H 2 O (volume ratio of 1:1:1), and then 0.375 g of the prepared sludge-based biochar (300 ℃, 400 ℃, 500 ℃) was dispersed as a carrier into the above-mixed solution, with magnetic stirring for 10 min at room temperature and ultrasonication for 20 min. The mixed solution was then transferred to a 100 mL PTFE-lined stainless steel autoclave and placed in an oven at 100 ℃ for 24 h. When the mixed solution was brought down to room temperature, the solution was collected, centrifuged to separate the solids, washed with ethanol three times, and then washed with ultrapure water two times. The washed samples were dried in a constant temperature oven at 80 ℃ for 12 h. Finally, the dried samples we...

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Amorphous/crystalline Cu1.5Mn1.5O4 with rich oxygen vacancies for efficiently photothermocatalytic mineralization of toluene

Cited by 17 publications

References 56 publications

Applications of amorphous inorganics as novel functional materials

Applications of amorphous inorganics as novel functional materials

Heterovalent State and Oxygen Vacancy Defect Structure‐Associated V/S Co‐Doped SnO₂ for Catalytic Reduction of Organic and Cr⁶⁺ Pollutants in the Dark

Performance and mechanism analysis of sludge-based biochar loaded with Co and Mn as photothermal catalysts for simultaneous removal of acetone and NO at low temperature

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Amorphous/crystalline Cu1.5Mn1.5O4 with rich oxygen vacancies for efficiently photothermocatalytic mineralization of toluene

Cited by 17 publications

References 56 publications

Applications of amorphous inorganics as novel functional materials

Applications of amorphous inorganics as novel functional materials

Heterovalent State and Oxygen Vacancy Defect Structure‐Associated V/S Co‐Doped SnO2 for Catalytic Reduction of Organic and Cr6+ Pollutants in the Dark

Performance and mechanism analysis of sludge-based biochar loaded with Co and Mn as photothermal catalysts for simultaneous removal of acetone and NO at low temperature

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Product

Resources

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Heterovalent State and Oxygen Vacancy Defect Structure‐Associated V/S Co‐Doped SnO₂ for Catalytic Reduction of Organic and Cr⁶⁺ Pollutants in the Dark