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In-situ fabrication of Ag/P-g-C3N4 composites with enhanced photocatalytic activity for sulfamethoxazole degradation
摘要： A series of Ag/P-g-C3N4 composites with different Ag content were synthesized for the first time by thermal polymerization combined with photo-deposition method. The composites were characterized by X-ray powder diffraction, field emission scanning electron microscope coupled with energy-dispersive X-ray spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet-visible diffuse reflectance spectra, N2 absorption-desorption and X-ray photoelectron spectroscopy. Ag was successfully dispersed on the surface of P-g-C3N4. The photocatalytic performance of P-g-C3N4 and Ag/P-g-C3N4 was evaluated by degrading sulfamethoxazole (SMX) under visible light irradiation. In the presence of 5% Ag/P-g-C3N4, 100% of SMX was degraded within 20 min. The enhanced photocatalytic activity of Ag/P-g-C3N4 was attributed to the surface plasmon resonance effect of metallic Ag and Schottky barrier formed on the interface between Ag and P-g-C3N4, which could speed up the generation rate of electrons and holes and inhibit the recombination of photogenerated electron-hole pairs. The radical quenching tests indicated that holes and superoxide radicals were the dominant active species involved in SMX degradation. The synthesized materials maintained high catalytic activity after five cycle runs. The concentration and the intermediates during the degradation process were determined by LC-MS/MS, and the tentative degradation pathways of SMX in photocatalytic system were proposed.
关键词： sulfamethoxazole,Ag/P-g-C3N4,intermediate,photocatalytic degradation,degradation pathways
更新于2025-09-23 15:21:21
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Clinical data on rare Sulfamethoxazole crystalluria assessed by Fourier Transform Infrared Spectrophotometry
摘要： The data contained in this article are related to the article entitled “Case report: Uncommon Sulfamethoxazole Crystalluria” [1]. Sulfamethoxazole crystalluria is very rare and crystals identification is complex [2,3]. We identified seven patients with uncommon urine crystals that were composed of N-Acetyl-Sulfamethoxazole. Three of the patients developed an acute renal failure simultaneously to crystalluria. Hence, this article describes the method of crystals identification thanks to infrared spectroscopy. The relevant clinical data of patients, including medical history, drug dosage and urine parameters related to the crystalluria are presented.
关键词： drug: adverse effect,Sulfamethoxazole,urine microscopy,acute renal failure,infrared spectrophotometry,crystalluria
更新于2025-09-23 15:21:01
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Rapid detection of sulfamethoxazole in plasma and food samples with in-syringe membrane SPE coupled with solid-phase fluorescence spectrometry
摘要： In this work, in-syringe membrane solid-phase extraction (MSPE) device was fabricated for the on-site sampling of sulfamethoxazole (SMX) in food samples followed by solid-phase fluorescence spectra analysis. The samples and fluorescamine (FA) were added to a syringe for derivation. Then, the derivative of SMX was extracted by a membrane in the syringe SPE device. Subsequently, the derivative on the membrane was measured immediately without additional elution procedure. The method was successfully applied in plasma, milk, and egg samples for the trace SMX detection, with the recovery of 98 % to 102 %, RSDs from 1 % to 6 %. Compared with liquid chromatography, direct detection of the concentrated analyte significantly improved the sensitivity. Moreover, fluorescamine made it unnecessary to separate SMX from the interference. Consequently, it was a time-saving, low-cost, and easy-operation method, which demonstrated the potential of in-syringe SPE as a promising candidate for on-site analysis.
关键词： Sulfamethoxazole,Food samples,In-syringe solid-phase extraction,Solid-phase fluorescence,Fluorescamine
更新于2025-09-23 15:19:57
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PtO/Pt4+-BiOCl with enhanced photocatalytic activity: Insight into the defect-filled mechanism
摘要： Photocatalyst performance largely depends on the arrangement of surface atoms, especially nanomaterials. Herein, we proposed a novel defect-filled strategy by filling Bi defects on BiOCl surface with Pt4+ to achieve the controlled arrangement of BiOCl-surface atoms. The resulting PtO/Pt4+-BiOCl photocatalyst showed higher sulfamethoxazole (SMZ) degradation and photocatalytic nitrogen-fixation efficiency than PtO/BiOCl. The first-order kinetic constant of SMZ degradation over PtO/Pt4+-BiOCl (0.1312 min?1) was nearly twofold higher than that of PtO/BiOCl (0.0776 min?1). The photocatalytic nitrogen fixation activities of PtO/BiOCl and PtO/Pt4+-BiOCl were 244.2 mol·L?1·h?1 and 375.6 mol·L?1·h?1, respectively. The enhanced photocatalytic activity mainly attributed to the increased light absorption ability and separation efficiency of electron-hole pairs by Pt4+ doping. The defect-filled mechanism was confirmed by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), Electron spin resonance(ESR), and Positron annihilation spectrometry. All these results indicated that the electrostatic interaction between Pt4+ in the precursor and Bi defects on the BiOCl surface was the key step in the defect-filled process. This work provides a new strategy for controlling the surface atom arrangement of nanomaterials.
关键词： sulfamethoxazole,photocatalysis,PtO/Pt4+-BiOCl,defects-filled mechanism
更新于2025-09-12 10:27:22
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Photochemical Degradation of the Antimicrobial Sulfamethoxazole upon Solar Light Excitation: Kinetics and Elucidation of Byproducts Using LC/ ESI+/MS2 Technique
摘要： The fate of the antimicrobial compounds in the environment is of great interest since their presence in the aquatic systems has raised environmental problems. More and more chemicals of this class are treated as emerging contaminants. The degradation of these compounds may result in the formation of a wide array of metabolites which can be more toxic than the parent substrate. Therefore, precise elucidation of all possible transformation products as well as a thorough study of their physico-chemical and biological properties is of great importance. The present work deals with the study of the photochemical behavior of sulfamethoxazole from the kinetic aspect as well as the elucidation of the products arising from the solar irradiation of the antimicrobial sulfamethoxazole in the aqueous solutions. HPLC/MS and HPLC/MS/MS with accurate mass measurements were used for this purpose.
关键词： Photolysis,Antimicrobial,Sulfamethoxazole,HPLC/MS
更新于2025-09-10 09:29:36