Keywords MOF-derived; C-TiO2/CoTiO3; Core/shell; Type II heterojunction; Antibiotics removal Highlights * Core/shell C-TiO.sub.2/CoTiO.sub.3 type II heterojunction was synthesized by MOF-derived ...method. * C-TiO.sub.2/CoTiO.sub.3 shows excellent photocatalytic degradation and TOC removal of CIP. * The *OH is the main radical species in the photocatalytic degradation of CIP. * A new approach and insight for the synthesis of core/shell heterojunction was proposed. A novel core/shell C-TiO.sub.2/CoTiO.sub.3 type II heterojunction was successfully synthesized via a direct calcination method by using MIL-125/Co core-shell nanocakes as a sacrificial template and precursor. In the calcination process, the organic ligand in MIL-125 acts as an in-situ carbon doping source to form a carbon-doped TiO.sub.2 core (C-TiO.sub.2). At the same time, CoTiO.sub.3 nanoparticles are formed on the surface of C-TiO.sub.2 by an in-situ solid-state reaction between the C-TiO.sub.2 and Co.sup.2+ shell of MIL-125/Co. Due to such delicate core/shell structural features, carbon doping and type II heterojunctions, C-TiO.sub.2/CoTiO.sub.3 core/shell composites can effectively harvest visible light, facilitate the interfacial separation and suppress the recombination of photogenerated electron-hole pairs, leading to the remarkable photocatalytic activity for removal of ciprofloxacin (CIP). In particular, C-TiO.sub.2/CoTiO.sub.3-3 exhibits the best photocatalytic degradation activity of CIP with a degradation efficiency of 99.6% and a total carbon content removal percentage of 76% under visible-light illumination for 120 min. In addition, the proposed photocatalytic mechanism study illustrated that the main radical species in the photocatalytic degradation of CIP using C-TiO.sub.2/CoTiO.sub.3 as the photocatalyst is *OH. This work provides a new approach and insight for synthesizing core/shell heterojunction-based photocatalysts for various applications. Author Affiliation: (a) Institute of Environmental Research at Greater Bay, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China (b) Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangdong, China * Corresponding authors. Article History: Received 6 September 2020; Revised 22 November 2020; Accepted 23 November 2020 (miscellaneous) Editor: Prof. G. Lyberatos (footnote)1 BY Lin and SS Li contributed equally to this manuscript. Byline: Biyun Lin (a,b,1), Shanshan Li (a,1), Yannan Peng (a), Zhihong Chen chenzhihong1227@sina.com (a,*), Xin Wang xin.wang@ecs-scnu.org (b,*)
Zusammenfassung Neben der Vermeidung postoperativer Wundinfektionen nach dermatochirurgischen Eingriffen hat die perioperative Antibiotikaprophylaxe (PAP) das Ziel, das Auftreten weiterer ...postoperativer Infektionskomplikationen, insbesondere der bakteriellen Endokarditis oder hämatogener Gelenkprotheseninfektionen, zu verhindern. In der vorliegenden Arbeit werden spezielle Situationen dargestellt, in denen eine PAP notwendig werden kann. So benötigen Patienten nach Herzklappenersatz jeglicher Art, einschließlich Transkatheter‐Klappenersatz oder bei Verwendung von Prothesenmaterial zur Herzklappenkorrektur, oder Patienten nach einer durchgemachten bakteriellen Endokarditis bei zweizeitigen dermatochirurgischen Eingriffen, Eingriffen an der Schleimhaut oder ulzerierten Tumoren eine PAP. Auch die Anwendung einer PAP in speziellen Situationen wie bei sekundärer Wundheilung, septischen dermatochirurgischen Eingriffen oder Ulcus cruris‐Chirurgie werden in dieser Arbeit anhand der aktuellen wissenschaftlichen Literatur ausführlich dargestellt und diskutiert. Die vorliegende Arbeit ist der 2. Teil des Positionspapiers der Arbeitsgruppe Antibiotic Stewardship der Deutschen Gesellschaft für Dermatochirurgie und formuliert evidenzbasierte Empfehlungen für die Verabreichung einer PAP bei dermatochirurgischen Eingriffen bei speziellen Indikationen und Situationen. Dies ist von besonderer Wichtigkeit, da bei dermatochirurgischen Eingriffen, wie im ersten Teil dargelegt, im Regelfall auf eine PAP verzichtet werden kann und sollte.
Due to its good visible-light photocatalytic activity and environmental friendliness, g-Csub.3Nsub.4 has attracted much attention. The relationship between precursor type and the properties of ...obtained catalysts is interesting to investigate. In this work, target catalysts were prepared via the thermal polymerization of different precursors, melamine, a mixture of urea and melamine, and a mixture of melamine and cyanuric acid. The prepared g-Csub.3Nsub.4 were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometry (FT-IR), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and scanning electron microscopy (SEM). Through the characterization and analysis, the adjusting of precursors could result in the change of the microstructure. The maximum BET surface area was 98.04 cmsup.3gsup.−1 through precursor controlling, more than eight times that of MCN (11.15 cmsup.3gsup.−1) using melamine as precursor. The thermal decomposition process was also analyzed to discuss the interaction and polymerization with precursor controlling. The introduction of melamine and cyanuric acid with melamine as precursors led to the formation of a special nanotube structure and additional function groups on the surface of g-Csub.3Nsub.4 to increase the photocatalytic activity.
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