Ni, Co-Embedded MOF-Derived N-Doped Bimetallic Porous Carbon for Adsorption-Photocatalytic Degradation of Organic Dyes and Antibiotics.

An efficient protocol for photocatalytic degradation of organic dyes and antibiotics has been successfully established via MOF-derived (MOF = metal-organic framework) Ni, Co-embedded N-doped bimetallic porous carbon nanocomposites (NiCo/NC). Such a NiCo/NC nanocomposite features well-distributed structures, suitable specific surface areas, and more active sites determined by various characterization analyses. The catalyst exhibits higher photocatalytic performance and stability toward the liquid-phase degradation of methylene blue (MB) under visible light irradiation for 60 min, after the adsorption-desorption equilibrium and the thorough degradation into H2O and CO2. Radical quenching experiments further confirmed the dominant effect of electron holes h+ and superoxide radical anions ·O2- for the MB photodegradation process. NiCo/NC was also appropriate for the degradation of Rhodamine B, methyl orange, tetracycline hydrochloride, and norfloxacin. Moreover, NiCo/NC is robust, and its photocatalytic activity is basically maintained after 8 cycles. This work is expected to provide additional information for the design of MOF-derived carbon material with more excellent properties and lay the foundation for further industrial applications.

Enhanced Adsorption-Photocatalytic Degradation of Organic Pollutants via a ZIF-67-Derived Co-N Codoped Carbon Matrix Catalyst.

Stable and efficient photocatalytic degradation of organic pollutants has been achieved via a ZIF-67-derived Co-embedded N-doped nanoporous carbon material catalyst (Co-N/C). The catalyst features a well-distributed structure, suitable specific surface area, and more active sites according to the various characterization analyses. The photocatalytic activity of Co-N/C was evaluated by the degradation of the target pollutant Rhodamine B (RhB). As a result, RhB could establish an adsorption-desorption equilibrium in the dark within 30 min and was thoroughly degraded into H2O and CO2 by Co-N/C under 500 W visible light irradiation in 40 min. Moreover, radical-quenching experiments and reactive oxygen species monitoring were performed to further probe the plausible photodegradation mechanism of RhB. Co-N/C is also appropriate for other alternative dyes and antibiotics affording ideal removal efficiencies. After the reaction, Co-N/C could be facilely separated by an external magnetic field and reused for eight reaction cycles without obvious deactivation of its photocatalytic properties. This study is expected to provide an instructive guideline for the design of efficient and recyclable composite photocatalysts derived from metal-organic frameworks for a broad range of environmental remediation processes.

Quantification of the presigmoid transpetrosal keyhole approach to petroclival region / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Despite the presigmoid transpetrosal approach has been used by different researchers in various ways, the surgical injury rate remains high. Applying a minimally invasive keyhole idea, we devised a presigmoid transpetrosal keyhole approach (PTKA), classified and quantitatively assessed their approach to the petroclival area on a cadaver model by using a neuronavigation system.</p><p><b>METHODS</b>The presigmoid transpetrosal keyhole approach was divided into four increasingly morbidity-producing steps: retrolabyrinthine, partial labyrinthectomy with petrous apicectomy, translabyrinthine and transcochlear keyhole approaches. Six latex-injected cadaveric heads (twelve sides) underwent dissection in which a neuronavigation system was used. An area of exposure 10 cm superficial to a central target (working area) was calculated. The area of clival exposure with each subsequent dissection was also calculated.</p><p><b>RESULTS</b>The retrolabyrinthine keyhole approach (RLK) spares hearing and facial function in theory but provides for only a small window of upper clival exposure. The view afforded by partial labyrinthectomy with petrous apicectomy keyhole approach (PLPAK) provides for up to four times this exposure. The translabyrinthine keyhole approach (TLK) and transcochlear keyhole approach (TCK), although producing more morbidity, add little in terms of a larger petroclival window. However, with each step, the surgical freedom for manipulation of instruments increases.</p><p><b>CONCLUSIONS</b>The presigmoid transpetrosal keyhole approach to the petroclival area is feasible and useful. The RLK has relatively limited utility. For lesions without bone invasion, the PLPAK provides a much more versatile exposure with an excellent chance of hearing and facial nerve preservation. The TLK provides for greater versatility in treating lesions but clival exposure is not greatly enhanced. The TCK adds little in terms of intradural exposure but should be reserved for cases in which access to the petrous carotid artery is necessary.</p>

Microsurgical anatomy of the presigmoid translabyrinthine keyhole approach / 中华显微外科杂志

Objective To design a new presigmoid translabyrinthine keyhole approach assisted by Stryker neuro-navigation system according to the keyhole idea,and observe microscopic anatomy structures, which could be.regarded as the bases of this approach in clinical application.Methods Navigation data were established on 8 cadaveric heads fixed by formalin and perfused intracranial vessels with colored silicone. A 7-cm postauricular C-shaped skin incision as we reported was performed.After elevating the skin flap and musculofascial flap,a 3.5 cm?3.0 cm bone window was made.On skeletonizing the sigmoid sinus,bony lab- yrinth and the canal for facial nerve,the presigmoid retrolabyrinthine,partial labyrinthectomy with petrous api- cectomy,translabyrinthine keyhole approaches were simulated in turn.The length of important structures ex- posed and the angle of vision were measured step by step, and the anatomic structures were observed.Re- suits The approach-correlated bone could precisely be drilled with the aid of neuro-navigation,which could avoid the bewilder in drilling process.The angles of visual field,the length of clivus andⅦcranial nerve were significantly increased after partial labyrinthectomy with petrous apicectomy or all labyrinth removal,but there were no significant difference between partial and all labyrinth removal.The retrolabyrinthine keyhole approach spares hearing and facial function but provided for limited window of petroclival region exposure.The partial labyrinthectomy with petrous apicectomy keyhole approach provided wider exposure to petroclival region,cere- bellopontine angle,prepontine region and posterior cavernous sinus;an area between theⅢ-XI cranial nerves was easily visible with an excellent chance of hearing and facial nerve preservation.The translabyrin- thine keyhole approach,producing more morbidity,provided for greater versatility in treating lesions,added little exposure of petroclival region.Conclusion The presigmoid translabyrinthine keyhole approach,which could provide excellent exposure of the petroclival region,was feasible to be performed in our study.The ap- proach-correlated bone could be precisely removed assisted by neuro-navigation system.The exposure was oh- viously increased hy partial labyrinthectomy with petrous apicectomy or all labyrinthine removal,the former provided an excellent chancre of hearing and facial nerve preservation.