Utilization of photocatalytic hydrogen evolved (Zn,Sn)(O,S) nanoparticles to reduce 4-nitrophenol to 4-aminophenol

Abdullah, Hairus; Kuo, Dong‐Hau

doi:10.1016/j.ijhydene.2018.04.036

Cited by 35 publications

(33 citation statements)

References 33 publications

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“…These lattice spacings were located in between those of ZnO and ZnS(111) planes and found to be 2.72, 2.84, and 2.96 Å. These results confirm the formation of oxysulfide and also showed good agreement with our previous works, which had been well discussed. − The SAED patterns of the CZ-2.5 nanocatalyst in Figure d obviously showed several broad diffraction rings due to its polycrystalline nature. The d -spacing values of the inner and outer ring patterns were determined to be 3.11 and 2.63 Å which, respectively, corresponding to d -spacings of ZnS(111) and ZnO(111).…”

Section: Results and Discussionsupporting

confidence: 88%

Environmentally Benign Photoreactions for Hydrogen Production and Cleavage of N═N bond in Azobenzene over Co-Doped Zn(O,S) Nanocatalyst: The Role of In Situ Generated H⁺

Shuwanto

Gultom

Abdullah

et al. 2020

ACS Appl. Energy Mater.

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In this study, fabrication of Co-doped zinc oxysulfide Zn(O,S) solid solution with different amounts of Co (0−10%) was demonstrated for photocatalytic application. It aims to support green energy production and environmental remediation, which have gained increasing attention over the years. Specifically, the as-prepared nanocatalyst was utilized for photocatalytic hydrogen production and hydrogenation reaction. The oxysulfide formation of Zn(O,S) was proved by selected area electron diffraction (SAED), X-ray diffraction (XRD), and diffuse reflectance spectroscopy (DRS) analyses. Briefly, a Co content of 2.5% was found to be the most optimum value for the doping at Zn cation sites in the Zn(O,S) structure, as supported by the results of electrochemical impedance spectroscopy (EIS) and transient photocurrent (TPC) analyses as well as by hydrogen evolution reaction (HER) experiments. In good agreement, 2.5% Co-doped Zn(O,S) exhibited the highest amount of photoevolved hydrogen (H 2 ) under either low-power UV light or solar light illumination, which were 27 000 and 1565 μmol g −1 , respectively. Furthermore, before forming H 2 , the in situ generated proton (H + ) by 2.5% Co-doped Zn(O,S) could be employed for the photocatalytic hydrogenation reaction (PHR) either to cleave the azo bond (NN) in azobenzene or to reduce the nitro group (−NO 2 ) in nitrobenzene. The UV light-induced conversions of AB and NB to aniline were completed within 30 and 120 min, respectively. Finally, the appropriate mechanisms for the HER and PHR, which involve molecular solvation, surface adsorption, molecular pinning, and hydrogenation reactions, are scrupulously proposed and discussed.

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Section: Results and Discussionsupporting

confidence: 88%

Environmentally Benign Photoreactions for Hydrogen Production and Cleavage of N═N bond in Azobenzene over Co-Doped Zn(O,S) Nanocatalyst: The Role of In Situ Generated H⁺

Shuwanto

Gultom

Abdullah

et al. 2020

ACS Appl. Energy Mater.

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“…Furthermore, the results obtained point to the occurrence of the conversion of 4-nitrophenolate to 4-benzoquinone [34] in a portion of the total amount of the initial analyte (see Scheme 3). 4-benzoquinone is another byproduct that is possibly formed in the process, as indicated by the characteristic absorbance signal at around 270 nm [35,36] (see Figure S3 in the supplementary material). Here, it is reasonably likely that a parallel reaction occurs on the counter electrode, where 4-nitrophenolate is electrochemically reduced to 4-aminophenolate (see Scheme 4).…”

Section: Photoelectrochemical Degradation Of 4-nitrophenolmentioning

confidence: 99%

“…4-benzoquinone is another byproduct that is possibly formed in the process, as indicated by the characteristic absorbance signal at around 270 nm [35,36] (see Figure S3 in Scheme 3). 4-benzoquinone is another byproduct that is possibly formed in the process, as indicated by the characteristic absorbance signal at around 270 nm [35,36] (see Figure S3 in The mineralization of 4-NP was evaluated based on the results obtained from TOC analysis. Aliquots of the working solution were collected and subjected to total organic carbon (TOC) quantification.…”

Section: Photoelectrochemical Degradation Of 4-nitrophenolmentioning

confidence: 99%

Using BiVO4/CuO-Based Photoelectrocatalyzer for 4-Nitrophenol Degradation

et al. 2020

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The present work reports the degradation of 4-nitrophenol using BiVO4/CuO hybrid material synthesized by the precipitation of BiVO4 in the presence of CuO. Morphological and structural characterizations were performed using X-ray diffraction and scanning electronic microscopy coupled to energy dispersive X-ray spectroscopy. Through the calculation of the Kubelka–Munk function applied to diffuse reflectance spectrophotometry data, the hybrid material presented absorption edge of 1.85 eV. The formation of p-n heterojunction between BiVO4 and CuO renders the hybrid material suitable for the construction of a photoanode employed in hydroxyl radical generation. UV–vis spectrophotometry and high-performance liquid chromatography experiments were performed in order to monitor the degradation of 4-nitrophenol and the formation of secondary products. Additional information regarding the hybrid material was obtained through ion chromatography and total organic carbon analyses. The application of BiVO4/CuO-based photocatalyzer led to a 50.2% decrease in total organic carbon after the degradation of 4-nitrophenol. Based on the results obtained in the study, BiVO4/CuO has proved to be a promising material suitable for the removal of recalcitrant compounds in water treatment plants.

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“…As we know, highly stable 4nitrophenol (4-NP) with relatively high toxicity is one of the pollutants from industrial wastes, which threatens our environment and health. 1 Reducing 4-NP to relatively friendly and useful 4-aminophenol (4-AP) is necessary to remediate the environment from human activity-generated 4-NP. However, the common method used in many research studies to overcome toxic 4-NP generated another problem to the environment, since excess sodium borohydrate (NaBH 4 ) was utilized as the reducing agent to reduce 4-NP to 4-AP.…”

Section: Introductionmentioning

confidence: 99%

Self-Protonated Ho-Doped Zn(O,S) as a Green Chemical-Conversion Catalyst to Hydrogenate Nitro to Amino Compounds

Abdullah

Gultom

Shuwanto

et al. 2020

ACS Appl. Mater. Interfaces

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Zn(O,S) has been successfully doped with different amounts of Ho and characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and transient photocurrent (TPC). The as-prepared Ho-doped Zn(O,S) catalysts with different Ho amounts are evaluated for hydrogen evolution reaction. The catalyst with the best performance in evolving hydrogen is further utilized to hydrogenate 4nitrophenol (4-NP) to 4-aminophenol (4-AP). It is found that doping with Ho obviously enhanced charge transfer and photoresponse properties of the catalyst. Therefore, the modified Zn(O,S) can optimally evolve hydrogen by 18 624 μmol/g, which is 20% higher than that of pristine Zn(O,S). Subsequently, the in situ generated hydrogen ions on catalyst surfaces also play an important role as a hydrogen source to hydrogenate 4-NP to 4-AP without any reducing agents such as NaBH 4 , which is commonly used as a hydrogen source. As Ho is doped in the lattices of Zn(O,S), it acts not only to separate photocarriers and to enhance the charge transfer but also to shorten the diffusion time of nitrophenolate ions to catalyst surfaces for further photocatalytic hydrogenation reaction (PHR) process. A plausible PHR mechanism has been provided to elucidate the great performance of Ho-modified Zn(O,S) for photocatalytic hydrogenation.

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Utilization of photocatalytic hydrogen evolved (Zn,Sn)(O,S) nanoparticles to reduce 4-nitrophenol to 4-aminophenol

Cited by 35 publications

References 33 publications

Environmentally Benign Photoreactions for Hydrogen Production and Cleavage of N═N bond in Azobenzene over Co-Doped Zn(O,S) Nanocatalyst: The Role of In Situ Generated H⁺

Environmentally Benign Photoreactions for Hydrogen Production and Cleavage of N═N bond in Azobenzene over Co-Doped Zn(O,S) Nanocatalyst: The Role of In Situ Generated H⁺

Using BiVO4/CuO-Based Photoelectrocatalyzer for 4-Nitrophenol Degradation

Self-Protonated Ho-Doped Zn(O,S) as a Green Chemical-Conversion Catalyst to Hydrogenate Nitro to Amino Compounds

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Utilization of photocatalytic hydrogen evolved (Zn,Sn)(O,S) nanoparticles to reduce 4-nitrophenol to 4-aminophenol

Cited by 35 publications

References 33 publications

Environmentally Benign Photoreactions for Hydrogen Production and Cleavage of N═N bond in Azobenzene over Co-Doped Zn(O,S) Nanocatalyst: The Role of In Situ Generated H+

Environmentally Benign Photoreactions for Hydrogen Production and Cleavage of N═N bond in Azobenzene over Co-Doped Zn(O,S) Nanocatalyst: The Role of In Situ Generated H+

Using BiVO4/CuO-Based Photoelectrocatalyzer for 4-Nitrophenol Degradation

Self-Protonated Ho-Doped Zn(O,S) as a Green Chemical-Conversion Catalyst to Hydrogenate Nitro to Amino Compounds

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Product

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About

Environmentally Benign Photoreactions for Hydrogen Production and Cleavage of N═N bond in Azobenzene over Co-Doped Zn(O,S) Nanocatalyst: The Role of In Situ Generated H⁺

Environmentally Benign Photoreactions for Hydrogen Production and Cleavage of N═N bond in Azobenzene over Co-Doped Zn(O,S) Nanocatalyst: The Role of In Situ Generated H⁺