RGO/Cu2O-CuO nanocomposite as a visible-light assisted photocatalyst for reduction of organic nitro groups to amines

Moghanlou, Ali Oji; Sadr, Moayad Hossaini; Bezaatpour, Abolfazl; Salimi, Farshid; Yosefi, Mohammad

doi:10.1016/j.mcat.2021.111997

Cited by 18 publications

(16 citation statements)

References 65 publications

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“…These peaks reveal significant Cu content on the surface of the composite cathode after MFC operation. The two distinct Cu 2p peaks and the weak satellite (943 mV) are consistent with the characteristic of Cu 2 O, 32 suggesting the presence of Cu 2 O on the surface of the composite cathode. This result confirms the reduction of copper ions, which gain electrons and to become cuprous ions, indicating that the heavy metal underwent the reduction reaction as a result of the use of MFC 33 …”

Section: Resultssupporting

confidence: 64%

Cathodes for microbial fuel cells that improve the removal of copper ions from wastewater concomitant with power generation using the response surface methodology

Liu

Zhu

Lin

2022

Intl J of Energy Research

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Microbial fuel cells (MFCs) have the potential to remove copper ions from wastewater, but the high cost of their cathode materials and their limited effectiveness in removing copper ions have limited their commercialization. In this study, a composite cathode was developed using response surface methodology (RSM); peanut shells were used to produce biochar, which was compounded with conductive carbon black (CCB). When 83% of the cathode material was biochar, its resistance was low and its copper adsorption capacity was high. An MFC with such a composite cathode removed 95% of copper from wastewater within 5 days, which is 1.52 times more than that removed using a CCB cathode MFC. Although the power production capacity of the composite cathode MFC was slightly lower than that of the CCB cathode MFC, the composite cathode achieved 56% of the power output of the CCB cathode MFC using only 17% of the CCB, significantly reducing the cost of cathode production. The optimized composite biochar cathode that was developed using RSM provides both low resistance and a high copper adsorption capacity, and can be used in MFCs to improve their removal of copper ions from wastewater. This investigation also demonstrates the potential of agricultural waste as an electrode material in MFCs, reducing their production cost and improving their performance.

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Section: Resultssupporting

confidence: 64%

Cathodes for microbial fuel cells that improve the removal of copper ions from wastewater concomitant with power generation using the response surface methodology

Liu

Zhu

Lin

2022

Intl J of Energy Research

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“…This indicates that there are capillary pores formed by the accumulation of CuO particles and flakes so that the adsorption and desorption of mesoporous pores are affected by capillary condensation. 28,35,44 Besides, the approximately vertical rise of the curve in the low-pressure region (P/ P 0 ∼ 0) suggested the existence of micropores, while the distinct hysteresis loop in the P/P 0 range of 0.47−0.99 indicated the presence of mesopores. 31 Moreover, H-CuO MNCs@rGO present a larger specific surface area (20.07 m 2 g −1 ) compared to Cu 2 O/CuO MNCs@rGO (9.32 m 2 g −1 ).…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Fabrication of Hollow and Hierarchical CuO Micro–Nano Cubes Wrapped by Reduced Graphene Oxide as a Prospective Anode for SIBs

Wen,

Jiang,

Huang

et al. 2023

Langmuir

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In this study, hollow and hierarchical CuO micro−nano cubes wrapped by reduced graphene oxide (H-CuO MNCs@rGO) were designed and successfully fabricated via a novel three-step wet-chemical method. Benefiting from its unique hollow and hierarchical micro−nano structures, H-CuO MNCs@rGO exhibited significantly enhanced electrochemical Na + storage performance when utilized as anode material for sodium-ion batteries (SIBs). Specifically, H-CuO MNCs@rGO demonstrated a specific capacity of 380.9 mAh g −1 in the initial reversible cycle and a capacity retention of 218.9 mAh g −1 after 150 cycles at a current density of 300 mA g −1 . Furthermore, through the dominant pseudocapacitive behavior, an optimized rate capability of 221.2 mAh g −1 at 800 mA g −1 can be obtained for H-CuO MNCs@rGO. The comprehensive Na + storage properties of H-CuO MNCs@rGO obviously exceeded those of hollow CuO cubes (H-CuO MNCs) and bulk CuO anodes. Such enhanced Na + storage performances of H-CuO MNCs@rGO can be attributed to its reasonable hollow and hierarchical micro−nano structures, which provide abundant redox active sites, shorten Na + migration pathway, buffer volume expansion, and improve electronic/ionic conductivity during sodiation/desodiation process. Our strategy provides a facile and innovative approach for the design of CuO with rational micro−nano structure as a highperformance anode for SIBs, which would also be a guiding way for tailoring transition metal oxides in other scalable and functional applications.

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“…In Figure b, the peaks at 932.6, 934.6, 952.4, and 954.7 eV corresponded to the peaks of Cu + 2p 3/2 , Cu 2+ 2p 3/2 , Cu + 2p 1/2 , and Cu 2+ 2p 1/2 , respectively. In addition, there were two Cu 2+ satellite peaks at 943.8 and 962.6 eV, and one Cu + satellite peak at 947.8 eV. , Although the XPS analysis of the Cu 2p spectrum showed that Cu 2 O and CuO were present on the surfaces of the Cu 2 O-MWCNT heterostructures at the same time, the proportion of Cu 2 O was larger than that of CuO based on the peak area. The existence of a small amount of CuO may have been caused by the natural oxidation of the sample during drying.…”

Section: Resultsmentioning

confidence: 89%

Ultrasensitive Bio-H₂S Gas Sensor Based on Cu₂O-MWCNT Heterostructures

Lu,

Chi,

Chen

et al. 2023

ACS Sens.

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Developing a respiratory analysis disease diagnosis platform for the H2S biomarker has great significance for the real-time detection of various diseases. However, achieving highly sensitive and rapid detection of H2S gas at the parts per billion level at low temperatures is one of the most critical challenges for developing portable exhaled gas sensors. Herein, Cu2O-multiwalled carbon nanotube (MWCNT) heterostructures with excellent gas sensitivity to H2S at room temperature and a lower temperature were successfully synthesized by a facile two-dimensional (2D) electrodeposition in situ assembly method. The combination of Cu2O and MWCNTs via the principle of optimal conductance growth not only reduced the initial resistance of the material but also provided an ideal interfacial barrier structure. Compared to the response of the pure Cu2O sensor, that of the Cu2O-MWCNT sensor to 1 ppm of H2S increased nearly 800 times at room temperature, and the response time decreased by more than 500 s. In addition to the excellent sensitivity with detection limits as low as 1 ppb, the Cu2O-MWCNT sensor was extremely selective with low-temperature adaptability. The sensor had a response value of 80.6 to 0.1 ppm of H2S at −10 °C, which is difficult to achieve with sensors based on oxygen adsorption/desorption mechanisms. The sensor was used for the detection of real oral exhaled breath, confirming its feasibility as a real-time disease monitoring sensor. The Cu2O-MWCNT heterostructures maximized the advantages of the individual components and laid the experimental foundation for future applications of highly sensitive portable breath analysis platforms for monitoring H2S.

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RGO/Cu2O-CuO nanocomposite as a visible-light assisted photocatalyst for reduction of organic nitro groups to amines

Cited by 18 publications

References 65 publications

Cathodes for microbial fuel cells that improve the removal of copper ions from wastewater concomitant with power generation using the response surface methodology

Cathodes for microbial fuel cells that improve the removal of copper ions from wastewater concomitant with power generation using the response surface methodology

Fabrication of Hollow and Hierarchical CuO Micro–Nano Cubes Wrapped by Reduced Graphene Oxide as a Prospective Anode for SIBs

Ultrasensitive Bio-H₂S Gas Sensor Based on Cu₂O-MWCNT Heterostructures

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RGO/Cu2O-CuO nanocomposite as a visible-light assisted photocatalyst for reduction of organic nitro groups to amines

Cited by 18 publications

References 65 publications

Cathodes for microbial fuel cells that improve the removal of copper ions from wastewater concomitant with power generation using the response surface methodology

Cathodes for microbial fuel cells that improve the removal of copper ions from wastewater concomitant with power generation using the response surface methodology

Fabrication of Hollow and Hierarchical CuO Micro–Nano Cubes Wrapped by Reduced Graphene Oxide as a Prospective Anode for SIBs

Ultrasensitive Bio-H2S Gas Sensor Based on Cu2O-MWCNT Heterostructures

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Ultrasensitive Bio-H₂S Gas Sensor Based on Cu₂O-MWCNT Heterostructures