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.

2025-07-01·Separation and Purification Technology

Constructing phosphine-containing microspheres for selective recovery of gold(I) thiosulfate complex by adjusting the interaction site

作者: Yang, Yuxin ; Li, Xinrong ; Hu, Xianzhi ; Zi, Futing ; Chen, Shuliang

The high capacity and selective recovery of gold(I) thiosulfate complex are the greatest obstacles hindering the rapid development of thiosulfate gold leaching technol.In this study, a batch of adsorbents for gold ion recovery from thiosulfate solutions were synthesized by functionalizing polystyrene cross-linked microspheres (PCMS) via nucleophilic substitution reactions using organic phosphines(III) with different carbon number as functional monomers.Increasing the pH of the adsorption solution or reducing the carbon number of the functional monomer in the adsorbent were found to enhance the gold ion adsorption performance of the adsorbent.The adsorbent (PCMS-TMP) obtained from the reaction of trimethylphosphine and PCMS exhibited the best gold adsorption performance, achieving a gold loading capacity of 136.42 mg/g.It also demonstrated selective recovery of low-concentration gold ions (6.175 mg/L), with a recovery rate as high as 98 %.The adsorption process of gold ions on PCMS-TMP was accurately described by the Langmuir isotherm and pseudo-second-order kinetic model.The gold adsorption process on PCMS-TMP primarily involved an anion exchange between Cl^- and Au(S₂O₃)^3-₂, which was also theor. validated through d. functional theory calculationsClearly, PCMS-TMP is an adsorbent with significant capacity and selective recovery capabilities for Au(I) from thiosulfate solutions

2025-07-01·Separation and Purification Technology

Fabrication of 2D MOF nanosheets decorated with SO42− for highly efficient and selective Hg2+ capture from wastewater

作者: Liu, Lei-Lei ; Wu, Hao ; Yu, Cai-Xia ; Ding, Jing ; Zhou, Yan-Li ; Yao, Meng-Ru

Mercury (Hg) pollution poses a serious threat to the public health and ecol. environment, necessitating the urgent development of efficient and selective methods for Hg²⁺ removal.Herein, an ultrathin two-dimensional (2D) metal-organic framework (MOF) nanosheet decorated with extensive SO^2-₄ active sites was elaborately constructed.The intimate contact and robust interactions between Hg²⁺ and the readily accessible SO^2-₄ sites on the exposed surfaces of the 2D nanosheets facilitated an unparalleled adsorption capacity for Hg²⁺, achieving a remarkable value of 989.19 mg/g.The robust binding between Hg²⁺ and SO^2-₄ on the exposed surfaces also imparted exceptional adsorption selectivity and anti-interference capability for the 2D nanosheets, enabling practical applications in diverse real-world samples (such as acidic groundwater, mercury-oxide battery industry wastewater and petrochem. wastewater), with Hg²⁺ removal efficiencies surpassing 94 %.The interactions between Hg²⁺ and SO^2-₄ sites were verified by the investigations of Fourier transform IR spectroscopy, X-ray photoelectron spectrometry, zeta potential, and d. functional theory calculations, which revealed that the robust interactions between Hg²⁺ and SO^2-₄ encompass not only their direct electrostatic attractions but also intricate interactions involving Hg²⁺ with sulfur (mol. recognition) and oxygen atoms (chelation).These interactions cooperatively contributed to the selective and efficient capture of Hg²⁺ from various water samples.This study provides valuable insights into the design and construction of advanced materials for environmental remediation and metal ion capture.

100 项与硫酸铜相关的药物交易

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