Yulun Nie,Xiaofei Sun,Miao Wang,Xike Tian,Chao Yang,Chu Dai
UV-H 2 O 2 is the most widely used oxidizing system with established effectiveness and a high level of technical development for practical application. However, little attention was paid on the effect of suspended particles in natural water on organic contaminants removal via UV-H 2 O 2 technique. In this study, this effect of suspended particles to enhance the contaminant degradation was explored using silica/alumina-based oxides (MCM-41 and Al@MCM-41) as the representative. The results showed that MCM-41 had no effect on OFX degradation compared with UV-H 2 O 2 . While the degradation efficiency and reaction rate were greatly enhanced at a pH range of 3.0–9.0 especially at acidic pH values (3.0–5.0) in the presence of Al@MCM-41. The probe experiments proved that OFX adsorption followed by surface reaction process played an important role to enhance the performance of UV-H 2 O 2 . Based on the characterization results, the positive effect of suspended particles was not related to their surface area and pore size distribution, but dependent on the chemical composition and surface acid-base property. The suspended particles can provide an active surface composed of acid and base sites. The base site can create a local basic micro-environment by producing more • OH et al. While the dissociated acid sites in Al@MCM-41 with a negative charged surface favor OFX adsorption and then reaction with produced ROS . Our findings suggest that the enhanced performance of UVA-H 2 O 2 induced by suspended particles should be concerned.
Antibiotic residues in food and the environment pose significant risks to public health and safety, necessitating the development of rapid, portable, and efficient detection methods. Ofloxacin (OFL), a widely used antibiotic, is of particular concern due to its potential for contamination in milk and surface water. Current detection methods often require expensive instrumentation and complex procedures, limiting their applicability for on-site testing. This work addresses the critical need for a cost-effective, portable approach to reliably detect OFL residues. We developed a novel personal glucose meter (PGM)-based aptasensor utilizing a porous spherical cerium-based metal-organic framework (Ce-MOF) as a loading platform for glucose oxidase (GOx) and oligonucleotide sequences (Ce-MOF-GOx-cDNA). The hybrid probe, formed by conjugating Ce-MOF-GOx-cDNA with aptamer-modified magnetic beads, enabled specific recognition of OFL through nucleobase pairing. The sensor exhibited a detection range of 50 pg/mL to 500 ng/mL with a detection limit of 40 pg/mL under optimal conditions. The process showed excellent selectivity, stability, and reproducibility. Real-sample testing in spiked milk and surface water demonstrated recovery rates of 99.5% – 108%, with relative standard deviations of less than 4.7%. This study presents a portable and efficient strategy for detecting OFL residues using a PGM-based aptasensor. The method combines simplicity, rapid detection, and high sensitivity, offering significant potential for on-site applications in food and environmental safety monitoring.
In this study, by the application of the strong interaction between a metal-organic framework material and ofloxacin, ZIF-8 was proposed as an absorbent to remove ofloxacin from wastewater. The results demonstrated that ZIF-8 could remove 96.3 ± 1.1% of ofloxacin from the ofloxacin solution of 100 mg/L, and the maximum equilibrium adsorption capacity reached 194.1 ± 0.4 mg/g, which is superior to that of an adsorbent based on physical adsorption. The high specific surface area and strong interaction between ofloxacin and ZIF-8, including strong hydrogen bonding , complexation of unsaturated metals, and electrostatic interactions , contributed to the adsorption process . Moreover, the adsorption efficiency reached 80.2% after four adsorption cycles. The pseudo-second-order kinetics and Langmuir adsorption model can describe the adsorption of ofloxacin by ZIF-8. Therefore, ZIF-8 is a promising material for the treatment of wastewater containing ofloxacin.
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