Fanning Kjellerup (hornlier1)

The removal of emerging contaminants is facilitated by Fenton-based electrochemical processes (FEPs), using newly engineered 3D photocatalyst nanocomposites, a fact that has garnered substantial research interest. While the development of numerous materials has occurred, a critical need remains to augment their efficiency, stability, and recyclability in order to address the limitations of FEPs. Through the investigation of sustainable approaches, this study seeks to engineer novel 3D core-shell photocatalyst composites applicable to FEPs. Improvements to the photo-assisted FEPs activity can be achieved through the use of these materials, and magnetism facilitates simple catalyst recycling processes. Using sustainable techniques, we successfully synthesized a magnetic and photoactive CuFe2O4@MIL-100(Fe) (CM) composite, then characterizing its morphology, physicochemical properties, and photocatalytic performance. To evaluate the catalytic activity of CM in the treatment of Cefadroxil, an undivided RuO2/air-diffusion cell was employed. The heterogeneous photoelectro-Fenton (HPEF) process demonstrated significantly higher degradation efficiency (achieving 100% in 120 minutes) compared to the electro-Fenton (100% in 210 minutes) and electrooxidation (733% in 300 minutes) processes, according to the results. HPEF's superior degradation efficiency is a consequence of the copious hydroxyl radical production, signifying its outstanding photocatalytic performance, attributed to the direct excitation of the Fe-O cluster, consequently boosting the redox reaction involving Fe2+/Fe3+. Parameters such as pH, catalyst concentration, current density, and the specific ratio of CuFe2O4 within the MIL-100(Fe) composite were optimized during the course of the HPEF process. The optimized composite's stability and easy recyclability allowed for high removal efficiency, which remained unaffected after five cycles of 90 minutes each. High degradation performance was measured in the presence of natural sunlight radiations. Moreover, proposed catalytic degradation mechanisms in HPEFs were derived from radical quenching experiments. The potential contribution of this study to the development of more sustainable and effective water treatment strategies is significant. The massive earthquake-induced accident at Fukushima Daiichi Nuclear Power Plant (FDNPP) in 2011 has led to the ongoing generation of substantial quantities of polluted water. To gain a thorough understanding of the FDNPP incident, and to furnish a fundamental guide for anticipating the transport of treated nuclear-contaminated water throughout the Northwest Pacific, seawater 137Cs and 134Cs distributions were measured down to 2000 meters in the subtropical region during May 2013. The results of the investigation, conducted in May 2013, suggested the presence of residual radiocesium from the FDNPP. Beneath the 1000-meter layer, no radiocesium attributable to FDNPP was discovered. The 137Cs contamination of the upper 500 meters of the water column, resulting from the FDNPP accident, reached a level of 0.46 PBq, equivalent to 16 times the background concentration of 0.28 PBq. The 137Cs and 134Cs maximum activity levels were 788 Bq/m3 and 340 Bq/m3, respectively. It is the Subtropical Mode Water (STMW) that predominantly drives the transport of 137Cs and 134Cs along subsurface isopycnals (250-256) to the subtropical region. A notable increase in the transport of FDNPP-derived radiocesiums to the subsurface layer and the subtropical region occurred due to the STMW, in tandem with the passing time. The cyclonic mesoscale eddy, in combination with the subduction of STMW, spurred a more pronounced downward transport and deeper penetration of radiocesiums. While vertical stratification and a low-salinity water mass (found at depths of 500 to 700 meters) occurred, these factors restricted the descent of radiocesium deeper into the ocean. This caused the FDNPP-released 137Cs and 134Cs t