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Carbon dioxide removal

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https://www.readbyqxmd.com/read/29028457/photocatalytic-degradation-of-p-cresol-using-tio2-zno-hybrid-surface-capped-with-polyaniline
#1
Thabo J Brooms, Benton Otieno, Maurice S Onyango, Aoyi Ochieng
This study evaluated the photocatalytic activity of polyaniline (PANI)-capped titanium dioxide and zinc oxide (TiO2/ZnO) hybrid, for the degradation of P-Cresol. The hybrid was synthesized by precipitating ZnO on the surface of commercial TiO2. An "in situ" chemical oxidative polymerization method was used to prepare the PANI capped hybrid (TiO2/ZnO/PANI). The photocatalysts were characterized by powder X-ray diffraction (XRD), a Brunauer Emmett Teller (BET) analyzer, Fourier-transform infrared (FTIR) and photoluminescence spectroscopies, high resolution-transmission electron microscopy (HR-TEM) and thermogravimetric analysis (TGA)...
October 13, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28991445/a-permanently-porous-yttrium-organic-framework-based-on-an-extended-tridentate-phosphine-containing-linker
#2
Andrey A Bezrukov, Pascal D C Dietzel
The metal-organic framework [Y(tbpp)]·nDMF (1) was synthesized from yttrium(III) nitrate and the tritopic linker tris(4'-carboxy[1,1'-biphenyl]-4-yl)phosphine (H3tbpp). The distance between the coordinating atoms of the carboxylate groups of the extended tridentate phosphine linker is more than 1.8 nm, resulting in an average pore dimension of 0.9 nm in the noninterpenetrated metal-organic framework. The material exhibits high thermal stability and permanent porosity after removal of guest molecules from the one-dimensional pore system...
October 9, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28979565/protective-ventilation-with-veno-venous-lung-assist-in-respiratory-failure-a-protocol-for-a-multicentre-randomised-controlled-trial-of-extracorporeal-carbon-dioxide-removal-in-patients-with-acute-hypoxaemic-respiratory-failure
#3
J J McNamee, M A Gillies, N A Barrett, A M Agus, R Beale, A Bentley, A Bodenham, S J Brett, D Brodie, S J Finney, A J Gordon, M Griffiths, D Harrison, C Jackson, C McDowell, C McNally, G D Perkins, W Tunnicliffe, A Vuylsteke, T S Walsh, M P Wise, D Young, D F McAuley
One of the few interventions to demonstrate improved outcomes for acute hypoxaemic respiratory failure is reducing tidal volumes when using mechanical ventilation, often termed lung protective ventilation. Veno-venous extracorporeal carbon dioxide removal (vv-ECCO2R) can facilitate reducing tidal volumes. pRotective vEntilation with veno-venouS lung assisT (REST) is a randomised, allocation concealed, controlled, open, multicentre pragmatic trial to determine the clinical and cost-effectiveness of lower tidal volume mechanical ventilation facilitated by vv-ECCO2R in patients with acute hypoxaemic respiratory failure...
May 2017: J Intensive Care Soc
https://www.readbyqxmd.com/read/28979541/management-of-severe-traumatic-brain-injury-and-acute-respiratory-distress-syndrome-using-pumped-extracorporeal-carbon-dioxide-removal-device
#4
Tim Martindale, Phillip McGlone, Robert Chambers, Jon Fennell
The effects of a high carbon dioxide on cerebral perfusion and intracranial pressure are well known. We report the case of a man who presented after with a severe traumatic brain injury including intracranial and extradural haemorrhage. Neuroprotective ventilation was impossible without supramaximal tidal volumes due to a combination of chest trauma and severe bronchospasm. A pump driven Novalung iLA active® system was inserted to achieve both ARDSnet ventilation and a lowering of intracranial pressure. To our knowledge, this is the first time this system has been used to this effect...
February 2017: J Intensive Care Soc
https://www.readbyqxmd.com/read/28975080/unexpected-collection-of-pulmonary-venous-blood-from-a-pulmonary-artery-catheter-a-case-report
#5
Naomi Ono, Junko Nakahira, Sayuri Matsunami, Toshiyuki Sawai, Toshiaki Minami
BACKGROUND: Pressure and waveform at the catheter tip are continuously monitored during catheterization of pulmonary artery to ensure accurate catheter placement. We present a case in which pulmonary venous blood was unexpectedly collected from the pulmonary artery catheter despite pulmonary artery pressure and waveform detection at the catheter tip, and describe the measures taken to correct the catheter placement. CASE PRESENTATION: A 74-year-old male underwent mitral valve plasty for cardiac failure caused by mitral valve regurgitation...
December 2016: Anesthesiology and Pain Medicine
https://www.readbyqxmd.com/read/28968577/contribution-of-forests-to-the-carbon-sink-via-biologically-mediated-silicate-weathering-a-case-study-of-china
#6
Zhaoliang Song, Hongyan Liu, Caroline A E Strömberg, Hailong Wang, Peter James Strong, Xiaomin Yang, Yuntao Wu
During silicate weathering, atmospheric carbon dioxide (CO2) is consumed and base cations are released from silicate minerals to form carbonate and bicarbonate ions, which are finally deposited as carbonate complexes. Continental silicate weathering constitutes a stable carbon sink that is an important influence on long-term climate change, as it sequesters atmospheric carbon dioxide at a million-year time scale. Traditionally, CO2 sequestered through silicate weathering is estimated by measuring the flux of the base cations to watersheds...
September 29, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28956436/effective-approach-for-increasing-the-heteroatom-doping-levels-of-porous-carbons-for-superior-co2-capture-and-separation-performance
#7
Yomna H Abdelmoaty, Tsemre-Dingel Tessema, Nazgol Norouzi, Oussama M El-Kadri, Joseph B McGee Turner, Hani M El-Kaderi
Development of efficient sorbents for carbon dioxide (CO2) capture from flue gas or its removal from natural gas and landfill gas is very important for environmental protection. A new series of heteroatom-doped porous carbon was synthesized directly from pyrazole/KOH by thermolysis. The resulting pyrazole-derived carbons (PYDCs) are highly doped with nitrogen (14.9-15.5 wt %) as a result of the high nitrogen-to-carbon ratio in pyrazole (43 wt %) and also have a high oxygen content (16.4-18.4 wt %). PYDCs have a high surface area (SABET = 1266-2013 m(2) g(-1)), high CO2 Qst (33...
October 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28946460/effects-of-sonication-on-co-precipitation-synthesis-and-activity-of-copper-manganese-oxide-catalyst-to-remove-methane-and-sulphur-dioxide-gases
#8
Yeow Hong Yap, Mitchell S W Lim, Zheng Yee Lee, Kar Chiew Lai, Muhamad Ashraf Jamaal, Farng Hui Wong, Hoon Kiat Ng, Siew Shee Lim, T Joyce Tiong
The utilisation of ultrasound in chemical preparation has been the focus of intense study in various fields, including materials science and engineering. This paper presents a novel method of synthesising the copper-manganese oxide (Hopcalite) catalyst that is used for the removal of volatile organic compounds and greenhouse gases like carbon monoxide. Several samples prepared under different conditions, with and without ultrasound, were subjected to a series of characterisation tests such as XRD, BET, FE-SEM, EDX, TPR-H2, TGA and FT-IR in order to establish their chemical and physical properties...
January 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28934881/effectiveness-of-lavage-techniques-in-removing-immunogenic-elements-from-osteochondral-allografts
#9
Maximilian A Meyer, Mark A McCarthy, Matthew E Gitelis, Sarah G Poland, Atsushi Urita, Susan Chubinskaya, Adam B Yanke, Brian J Cole
Objective This study aimed to compare standard saline lavage to combination saline and high-pressure carbon dioxide (CO2) lavage in removing marrow elements from osteochondral allografts. Design Six fresh hemicondyles were obtained. Three osteochondral allograft plugs (15-mm diameter, 6-mm depth) were harvested from each hemicondyle and randomized to 1 of 3 treatment arms: A, no lavage; B, 1 L standard saline lavage; C, simultaneous saline (1 L) and 1-minute high-pressure CO2 lavage. After hematoxylin and eosin staining, a "percentage fill" of remaining marrow elements was calculated for each overall sample and then repeated in 3 distinct compartments for each sample based on depth from surface: 1, deepest third; 2, middle third; and 3, most superficial third...
October 2017: Cartilage
https://www.readbyqxmd.com/read/28933825/the-surface-chemistry-of-perovskite-type-electrodes-during-high-temperature-co2-electrolysis-investigated-by-operando-photoelectron-spectroscopy
#10
Alexander Karl Opitz, Andreas Nenning, Christoph Rameshan, Markus Kubicek, Thomas Götsch, Raoul Blume, Michael Hävecker, Axel Knop-Gericke, Gunther Rupprechter, Bernhard Klötzer, Juergen Fleig
Any substantial move of energy sources from fossil fuels to renewable resources requires large scale storage of excess energy, for example via power to fuel processes. In this respect electrochemical reduction of CO2 may become very important, since it offers a method of sustainable CO production, which is a crucial prerequisite for synthesis of sustainable fuels. Carbon dioxide reduction in solid oxide electrolysis cells (SOECs) is particularly promising owing to the high operating temperature, which leads to both improved thermodynamics and fast kinetics...
September 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28930639/50-years-of-research-in-ards-tidal-volume-selection-in-the-acute-respiratory-distress-syndrome
#11
Sarina K Sahetya, Jordi Mancebo, Roy G Brower
Mechanical ventilation (MV) is critical in the management of many patients with the acute respiratory distress syndrome (ARDS). However, MV can also cause ventilator-induced lung injury (VILI). The selection of an appropriate tidal volume is an essential part of a lung-protective MV strategy. Since the publication of a large randomized clinical trial demonstrating the benefit of lower tidal volumes, the use of tidal volumes of 6 mL/kg predicted body weight (PBW, based on sex and height) has been recommended in clinical practice guidelines...
September 20, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28914339/do-we-need-randomized-clinical-trials-in-extracorporeal-respiratory-support-yes
#12
EDITORIAL
Alain Combes, Antonio Pesenti, Daniel Brodie
Extracorporeal respiratory support, also known as extracorporeal gas exchange, may be used to rescue the most severe forms of acute hypoxemic respiratory failure with high blood flow venovenous extracorporeal membrane oxygenation. Alternatively, lower flow extracorporeal carbon dioxide removal might be applied to reduce the intensity of mechanical ventilation in patients with less severe forms of the disease. However, critical reading of the results of the randomized trials and case series published to date reveals major methodological biases...
September 15, 2017: Intensive Care Medicine
https://www.readbyqxmd.com/read/28902989/characterizing-the-impacts-of-deposition-techniques-on-the-performance-of-mno2-cathodes-for-sodium-electrosorption-in-hybrid-capacitive-deionization
#13
Steven Hand, Roland D Cusick
Capacitive deionization (CDI) is currently limited by poor ion-selectivity and low salt adsorption capacity of porous carbon electrodes. To enhance selectivity and capacity via sodium insertion reactions, carbon aerogel electrodes were modified by depositing amorphous manganese dioxide layers via cyclic voltammetry (CV) and electroless deposition (ED). MnO2-coated electrodes were evaluated in a hybrid capacitive deionization system to understand the relationship between oxide coating morphology, electrode capacitance, and sodium removal efficacy...
October 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28902710/a-novel-method-of-organotypic-spinal-cord-slice-culture-in-rats
#14
Jing-Jie Liu, Ya-Juan Huang, Li Xiang, Feng Zhao, Sheng-Li Huang
This study was undertaken to establish a method for the culture of organotypic spinal cord slices. A long-term organotypic spinal cord slice culture was conducted from postnatal rats. Lumbar spinal cord was isolated, and meninges were removed from the spinal cord. The spinal cord was embedded in 4% agarose, and was sectioned by vibratome into slices. Then the slices were cultured on the surface of the membrane inserts, which were placed in six-well plates containing 1 ml of growth medium at 37°C in an incubator with 5% humidified carbon dioxide...
November 8, 2017: Neuroreport
https://www.readbyqxmd.com/read/28895649/enhanced-trace-co2-capture-on-heteroatom-substituted-rho-zeolites-under-humid-conditions
#15
Quan-Li Ke, Tian-Jun Sun, Xiao-Li Wei, Ya Guo, Shu-Dong Wang
In this paper, boron and copper heteroatoms were successfully incorporated into the frameworks of high-silica RHO zeolite by adopting a bulky alkali metal-crown ether (AMCE) complex as the template. As a consequence, these heteroatom-doped zeolites show both larger micropore surface areas and volumes than those of their aluminosilicate analogue. Proton-type RHO zeolites were then applied for separation of CO2 / CH4 / N2 mixtures so as to weaken the electric field of these zeolites and then decrease the adsorption heat...
September 12, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28888230/effect-of-supercritical-carbon-dioxide-on-the-enzymatic-production-of-biodiesel-from-waste-animal-fat-using-immobilized-candida-antarctica-lipase-b-variant
#16
Aldricho Alpha Pollardo, Hong-Shik Lee, Dohoon Lee, Sangyong Kim, Jaehoon Kim
BACKGROUND: Waste animal fat is a promising feedstock to replace vegetable oil that widely used in commercial biodiesel process, however the high content of free fatty acid in waste fat makes it unfeasible to be processed with commercial base-catalytic process. Enzymatic process is preferable to convert waste fat into biodiesel since enzyme can catalyze both esterification of free fatty acid and transesterification of triglyceride. However, enzymatic reaction still has some drawbacks such as lower reaction rates than base-catalyzed transesterification and the limitation of reactant concentration due to the enzyme inhibition of methanol...
September 9, 2017: BMC Biotechnology
https://www.readbyqxmd.com/read/28886877/functional-sustainability-of-periphytic-biofilms-in-organic-matter-and-cu-2-removal-during-prolonged-exposure-to-tio2-nanoparticles
#17
Junzhuo Liu, Jun Tang, Juanjuan Wan, Chenxi Wu, Bruce Graham, Philip G Kerr, Yonghong Wu
Responses of microbial communities to nanotoxicity in aquatic ecosystems are largely unknown, particularly with respect to relationship between community dynamics and functions. Here, periphytic biofilms were selected as a model of species-rich microbial communities to elucidate their responses when exposed to titanium dioxide nanoparticles (TiO2-NPs). Especially, the relationships between the functions (e.g. organic matter and Cu(2+) removal) and community dynamics after long-term exposure to TiO2-NPs were assessed systematically...
August 30, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28875449/an-extracorporeal-carbon-dioxide-removal-ecco2r-device-operating-at-hemodialysis-blood-flow-rates
#18
R Garrett Jeffries, Laura Lund, Brian Frankowski, William J Federspiel
BACKGROUND: Extracorporeal carbon dioxide removal (ECCO2R) systems have gained clinical appeal as supplemental therapy in the treatment of acute and chronic respiratory injuries with low tidal volume or non-invasive ventilation. We have developed an ultra-low-flow ECCO2R device (ULFED) capable of operating at blood flows comparable to renal hemodialysis (250 mL/min). Comparable operating conditions allow use of minimally invasive dialysis cannulation strategies with potential for direct integration to existing dialysis circuitry...
September 6, 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28869704/eliminating-glutaraldehyde-from-crosslinked-collagen-films-using-supercritical-co2
#19
Dominic M Casali, Michael J Yost, Michael A Matthews
Collagen has received considerable attention as a biomaterial for tissue engineering because of its low immunogenicity, controllable biodegradation, and ability to influence cell growth and proliferation. Frequently, collagen scaffolds require crosslinking to improve mechanical strength, requiring agents like glutaraldehyde that have high residual cytotoxicity. A novel method for extracting residual glutaraldehyde from crosslinked collagen films with supercritical carbon dioxide (CO2 ) is presented. CO2 is a non-toxic, non-flammable substance that is relatively inert and can be used to process biomaterials at mild pressures and physiologic temperatures...
September 4, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28864923/evaluation-of-carbon-dioxide-laser-therapy-for-benign-tumors-of-the-eyelid-margin
#20
Aniko Rentka, Jan Grygar, Zoltan Nemes, Adam Kemeny-Beke
Eyelid margin tumors require special attention based on both anatomical and histological perspectives. Our aim in this study was to evaluate carbon dioxide (CO2) laser therapy for the treatment of eyelid margin tumors. Fifty-two patients with 55 eyelid margin tumors were included in this study. All tumors were removed with a CO2 laser, and histopathological evaluation was obtained in 52 cases. All patients were followed up for a mean period of 8.5 months (range 6 to 14 months). There were no bleedings in the intra- and postoperative period; the wounds were dry and reepithelized after 10-14 days and no recurrence occurred during follow-up period...
September 2, 2017: Lasers in Medical Science
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