Min Lei,Lisha Jiang,Chunhui Wang,Jianxin Song,Wei Liu,Jie Qiu
Deuterium oxide (D2O) is widely used in diverse fields, notably as a moderator in heavy water reactors, for electrolytic extraction of deuterium gas, and in nuclear magnetic resonance (NMR) research. However, it exhibits a high susceptibility to H2O contamination. Herein, a fluorescent hydrogen-bonded molecular organic crystal (ASP-101) with robust π–π interactions was synthesized by using 5,5′-(9,10-anthracene diphenyl dicarboxylic acid) (H4ADIP) and dimethyl sulfoxide (DMSO). Distinct fluorescence quenching phenomena were observed when ASP-101 was soaked in H2O and D2O. Based on these phenomena, subsequent studies demonstrated that ASP-101 is capable of detecting trace amounts of H2O in D2O, with a KSV value of 6 × 10−2 M−1 and a detection limit of 6.5 × 10−3 M (0.117 ppm). Batch experiments proved that the DMSO molecules within ASP-101 undergo exchange with H2O and D2O after soaking in aqueous solution. Previous research had found that deuteration can affect the emission properties of organic molecules. Thus, ASP-101's ability to detect H2O in D2O may be attributed to the fluorescent difference arising from the incorporation of H2O and D2O into its structure via solvent exchange. This study presents an authentic scenario for advancing isotopic identification based on alterations in fluorescence induced by solvent exchange.
The present study aimed to prepare an aluminum-based nanoflower (Al-NF) adsorbent using wasted aluminum polishing solution as raw materials, which effectively isolated the residues of anti-epidemic related drugs (lopinavir (LPV) and ciprofloxacin (CIP)) from wastewater. A comprehensive characterization approach involving SEM, XRD, BET, TGA, FTIR, and XPS was employed to investigate the adsorption capacity and mechanism of Al-NF towards LPV and CIP. The results revealed that the adsorption process involved both homogeneous and non-homogeneous interactions between the LPV/CIP molecules and the Al-NF surface. According to the Langmuir model calculations, the maximum adsorption capacities of Al-NF for LPV and CIP at 293.15 K were determined to be 32.41 mg/g and 14.43 mg/g, respectively, while their adsorption kinetics followed a pseudo-second-order model more appropriately. Furthermore, the spontaneous exothermic nature of LPV/CIP adsorption on Al-NF was confirmed by thermodynamic analysis. The mechanism investigations indicated that hydrogen bonding, electrostatic interaction, π-π bonding interaction, as well as n-π EDA bonding collectively contributed to the overall adsorption process on the Al-NF surface for both LPV and CIP species. Additionally, the reusability demonstrated by Al-NF highlights its potential as a promising low-cost material for removing anti-epidemic related drug residues from wastewater utilizing industrial hazardous wastes.
危险品化学品经营许可证（带存储）