Xihua University

With the increasing concern for ecological environmental and food safety, the development of synergistic systems integrating efficient bisphenol trace sensing and green photocatalytic degradation has emerged as a current research focus. In this study, a novel surface-enhanced Raman scattering (SERS) sensing-degradation integrated platform was successfully developed for the detection and degradation of bisphenol through the uniform modification of hydrogen-bonded organic framework nanorods loaded with gold nanoparticles (HOFs@Au). Based on the remarkable molecular enrichment effect of the porous structure of HOFs and the strong localized surface plasmon resonance (LSPR) effect from the AuNPs, the composite system exhibited excellent trace detection performance. Experimental results revealed that the HOFs@Au not only enabled trace SERS detection of bisphenol A (BPA), bisphenol S (BPS), and bisphenol F (BPF), but also demonstrated excellent photocatalytic degradation performance. Based on the advantages of HOFs@Au, the SERS sensor demonstrated a detection limit as low as 10^-8 M, a high enhancement factor (EF) of 2.3 × 10⁵ and photodegradation removal efficiency as high as 80 %, providing a novel solution for precise monitoring and green remediation of bisphenol contaminants. The system shows great potential for applications in ecological environmental risk early warning and food safety monitoring.

The electrochemical nitrate reduction reaction (NO₃RR) to ammonia offers a promising approach for wastewater treatment and ammonia synthesis. However, the generation of various by-products, such as nitrite ions (NO₂^-), and the occurrence of the competitive hydrogen evolution reaction (HER) complicate reaction pathways, causing unwanted electrical energy consumption and reducing the product selectivity. Herein, we introduce a pulse electrolysis approach to control the sequential accumulation and conversion of NO₂^- intermediates during the NO₃RR using a conductive rod-like zinc-based metal organic framework (Zn-MOF) electrode with precise atomic structures. This strategy substantially improves both the yield and Faraday efficiency (FE_NH3) of NH₃ production relative to constant-potential electrolysis. After a long-term stability test, the high-purity ammonia product in the electrolyte was successfully extracted via an argon (Ar) stripping process, showing a practical way to turn wastewater nitrate into valuable ammonia-derived products. This study presents a promising strategy for rationally designing metal organic framework (MOFs) electro-catalysts with precise atomic structures and controlling complex reactions, thereby minimizing side reactions, significantly boosting nitrate-to-ammonia conversion efficiency.

This study focuses on the development of an integrated analytical platform with in situ surface-enhanced Raman spectroscopy (SERS) monitoring capabilities, achieved through the design of a dual-functional, two-dimensional microporous covalent organic framework (COF). The hydrazone-functionalized COF not only exhibits selective recognition for Au(III)/Pt(IV) ions but also achieves efficient recovery of Au(III) from the leachate of waste electronic components, with a recovery efficiency of 95.73 %. By harnessing the enzyme-like catalytic activity of the COF@Au composite and the synergistic combination of COF's confinement effects with the localized surface plasmon resonance of Au nanoparticles, we created enhanced electromagnetic field regions on the material surface. This configuration enables real-time SERS tracking of reactant-product evolution during the reduction of 4-nitrothiophenol (4-NTP), with a reaction rate constant of 0.0181 s^-1. This integrated platform combines precious metal recovery reactions, catalytic processes and in-situ SERS monitoring (" recovery - catalysis - monitoring "), establishing a new paradigm of green and real-time tracking analysis.