Author: Khaorapapong, Nithima ; Baoulan, Areebhorn ; Pongkan, Nipaporn ; Rattanawongsa, Wachiraya ; Suppaso, Chomponoot ; Asakura, Yusuke ; Intachai, Sonchai ; Yamauchi, Yusuke

The formation of copper oxide and zinc oxide mixture in montmorillonite was conducted by the reaction of an aqueous dispersion of Cu²⁺/Zn²⁺ exchanged montmorillonite and an aqueous solution of sodium hydroxide under hydrothermal treatment. The resulting product was characterized by X-ray diffraction, scanning and transmittance electron microscopies, as well as UV-visible and photoluminescence spectroscopies. The diffuse reflectance absorption spectra showed the absorption onsets due to copper oxide (885 nm) and zinc oxide (310 and 580 nm) in the product. The adsorption of methylene blue was fitted well by the Langmuir model with the maximum adsorption capacity of 454 mg⋅g^-1. The thermodynamic studies revealed that the process is exothermic and spontaneous. The photocatalytic activity of the hybrid was assessed by the degradation of methylene blue in aqueous solution under visible light irradiation. The most active species in the photocatalytic process was hydroxyl radicals. The regenerated copper oxide/zinc oxide-montmorillonite was reused up to 5 cycles, the photodegradation efficiency dropped only 5% (from 94% to 89%), supporting the good stability of the photocatalyst. The result was in agreement with the advantages of the nanocomposite heterostructure and the unique nature of montmorillonite.

01 Dec 2025·Nano-Micro Letters

Exploration of Gas-Dependent Self-Adaptive Reconstruction Behavior of Cu2O for Electrochemical CO2 Conversion to Multi-Carbon Products

Article

Author: Wang, Sihong ; Zhang, Chaoran ; Jiang, Qu ; Song, Fang ; Feng, Ruohan ; Gu, Yichuan ; Sheng, Ziyang ; Zhang, Haoyue ; Xu, Qianqing ; Yuan, Zijian

AbstractStructural reconstruction of electrocatalysts plays a pivotal role in catalytic performances for CO2 reduction reaction (CO2RR), whereas the behavior is by far superficially understood. Here, we report that CO2 accessibility results in a universal self-adaptive structural reconstruction from Cu2O to Cu@CuxO composites, ending with feeding gas-dependent microstructures and catalytic performances. The CO2-rich atmosphere favors reconstruction for CO2RR, whereas the CO2-deficient one prefers that for hydrogen evolution reaction. With the assistance of spectroscopic analysis and theoretical calculations, we uncover a CO2-induced passivation behavior by identifying a reduction-resistant but catalytic active Cu(I)-rich amorphous layer stabilized by *CO intermediates. Additionally, we find extra CO production is indispensable for the robust production of C2H4. An inverse correlation between durability and FECO/FEC2H4 is disclosed, suggesting that the self-stabilization process involving the absorption of *CO intermediates on Cu(I) sites is essential for durable electrolysis. Guided by this insight, we design hollow Cu2O nanospheres for durable and selective CO2RR electrolysis in producing C2H4. Our work recognizes the previously overlooked passivation reconstruction and self-stabilizing behavior and highlights the critical role of the local atmosphere in modulating reconstruction and catalytic processes.

01 Sep 2025·Journal of Photochemistry and Photobiology A: Chemistry

A water-soluble copper(II) complex fluorescent probe for high-sensitive and selective detection of endogenous H2S

Author: Zhang, Chen ; Wang, Lin-Lin ; Chen, Guang ; Yin, Jing-Yi ; Ma, Si-Yue ; Miao, Qing ; Wang, Chao ; Wang, Yu-Xuan

H₂S has been identified as a third gasotransmitter involved in bio-modulation pathways.However, the low concentration of endogenous H₂S makes it difficult to trace and detect.In this study, a net charged and water-soluble copper(II) complex, Cu-L, is reported as an endogenous H₂S detector by utilizing a fluorescence on-off-on strategy.The luminescence of ligand L (a DNS-modified DO2A derivant), which is quenched due to Cu²⁺ coordination, can be effectively and selectively relumed within seconds in the presence of H₂S.Meanwhile, Cu-L has been successfully employed for exogenous and endogenous H₂S imaging and neither Cu-L nor L shows toxicity at concentrations up to 50 μM.Moreover, Cu-L can trace endogenous H₂S concentration fluctuation by treating cells with different concentrations of S-propargyl-cysteine (SPRC), an endogenous H₂S modulator.Therefore, Cu-L holds the potential for H₂S detection both in vitro and in cell.

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Indication	Country/Location	Organization	Date
Nutrition Disorders	United States	Hospira, Inc.	26 Jun 1986

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