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Carbon dioxide removal

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https://www.readbyqxmd.com/read/29240225/modeling-electron-competition-among-nitrogen-oxides-reduction-and-n2-o-accumulation-in-hydrogenotrophic-denitrification
#1
Yiwen Liu, Huu Hao Ngo, Wenshan Guo, Lai Peng, Xueming Chen, Dongbo Wang, Yuting Pan, Bing-Jie Ni
Hydrogenotrophic denitrification is a novel and sustainable process for nitrogen removal, which utilizes hydrogen as electron donor and carbon dioxide as carbon source. Recent studies have shown that nitrous oxide (N2 O), a highly undesirable intermediate and potent greenhouse gas, can accumulate during this process. In this work, a new mathematical model is developed to describe nitrogen oxides dynamics, especially N2 O, during hydrogenotrophic denitrification for the first time. The model describes electron competition among the four steps of hydrogenotrophic denitrification through decoupling hydrogen oxidation and nitrogen reduction processes using electron carriers, in contrast to the existing models that couple these two processes and also do not consider N2 O accumulation...
December 14, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29233584/sono-and-photoelectrocatalytic-processes-for-the-removal-of-ionic-liquids-based-on-the-1-butyl-3-methylimidazolium-cation
#2
Ismael F Mena, Salvador Cotillas, Elena Díaz, Cristina Sáez, Ángel F Mohedano, Manuel A Rodrigo
In this work, sono- and photoelectrolysis of synthetic wastewaters polluted with the ionic liquids 1-Butyl-3-methylimidazolium acetate (BmimAc) and chloride (BmimCl) were investigated with diamond anodes. The results were compared to those attained by enhancing bare electrolysis with irradiation by UV light or with the application of high-frequency ultrasound (US). Despite its complex heterocyclic structure, the Bmim+ cation was successfully depleted with the three technologies that were tested and was mainly transformed into four different organic intermediates, an inorganic nitrogen species and carbon dioxide...
December 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29223704/decellularized-heart-ecm-hydrogel-using-supercritical-carbon-dioxide-for-improved-angiogenesis
#3
Yoojin Seo, Youngmee Jung, Soo Hyun Kim
Initial angiogenesis within the first 3 days is critical for healing ischemic diseases such as myocardial infarction. Recently, decellularized extracellular matrix (dECM) has been reported to provide tissue-derived ECM components and can be used as a scaffold for cell delivery for angiogenesis in tissue engineering. Decellularization by various detergents such as sodium dodecyl sulfate (SDS) and triton X-100 can remove the cell nuclei in tissue organs. However, this leads to ECM structure denaturation, decreased presence of various ECM proteins and cytokines, and loss of mechanical properties...
December 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29214783/effective-tidal-volume-for-normocapnia-in-very-low-birth-weight-infants-using-high-frequency-oscillatory-ventilation
#4
Seul Mi Lee, Ran Namgung, Ho Sun Eun, Soon Min Lee, Min Soo Park, Kook In Park
PURPOSE: Removal of CO₂ is much efficient during high-frequency oscillatory ventilation (HFOV) for preterm infants. However, an optimal carbon dioxide diffusion coefficient (DCO₂) and tidal volume (VT) have not yet been established due to much individual variance. This study aimed to analyze DCO₂ values, VT, and minute volume in very-low-birth-weight (VLBW) infants using HFOV and correlates with plasma CO₂ (pCO₂). MATERIALS AND METHODS: Daily respiratory mechanics and ventilator settings from twenty VLBW infants and their two hundred seventeen results of blood gas analysis were collected...
January 2018: Yonsei Medical Journal
https://www.readbyqxmd.com/read/29155579/catalytic-conversion-of-carbohydrates-to-initial-platform-chemicals-chemistry-and-sustainability
#5
László T Mika, Edit Cséfalvay, Áron Németh
The replacement of fossil resources that currently provide more than 90% of our energy needs and feedstocks of the chemical industry in combination with reduced emission of carbon dioxide is one of the most pressing challenges of mankind. Biomass as a globally available resource has been proposed as an alternative feedstock for production of basic building blocks, which could partially or even fully replace the currently utilized fossil-based ones in well-established chemical processes. The destruction of lignocellulosic feed followed by oxygen removal from its cellulose and hemicellulose content by catalytic processes results in the formation of initial platform chemicals (IPCs)...
November 20, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/29152939/right-patient-selection-and-management-in-veno-venous-extracorporeal-carbon-dioxide-removal
#6
Tommaso Pettenuzzo, Lorenzo Del Sorbo
No abstract text is available yet for this article.
November 17, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/29150502/hyperthermophilic-carbamate-kinase-stability-and-anabolic-in-vitro-activity-at-alkaline-ph
#7
James E Hennessy, Melissa J Latter, Somayeh Fazelinejad, Amy Philbrook, Daniel M Bartkus, Hye-Kyung Kim, Hideki Onagi, John G Oakeshott, Colin Scott, Apostolos Alissandratos, Christopher J Easton
Carbamate kinases catalyze the conversion of carbamate to carbamoyl phosphate, which is readily transformed into other compounds. Carbamate forms spontaneously from ammonia and carbon dioxide in aqueous solutions, so the kinases have potential for sequestrative utilization of the latter compounds. Here, we compare seven carbamate kinases from mesophilic, thermophilic and hyperthermophilic sources. In addition to the known enzymes from Enterococcus faecalis and Pyrococcus furiosus, the previously unreported enzymes from the hyperthermophiles Thermococcus sibiricus and Thermococcus barophilus, the thermophiles Fervidobacterium nodosum and Thermosipho melanesiensis, and the mesophile Clostridium tetani, were all expressed recombinantly, each in high yield...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29145459/the-construction-of-ventilation-turrets-in-atta-vollenweideri-leaf-cutting-ants-carbon-dioxide-levels-in-the-nest-tunnels-but-not-airflow-or-air-humidity-influence-turret-structure
#8
Florian Halboth, Flavio Roces
Nest ventilation in the leaf-cutting ant Atta vollenweideri is driven via a wind-induced mechanism. On their nests, workers construct small turrets that are expected to facilitate nest ventilation. We hypothesized that the construction and structural features of the turrets would depend on the colony's current demands for ventilation and thus might be influenced by the prevailing environmental conditions inside the nest. Therefore, we tested whether climate-related parameters, namely airflow, air humidity and CO2 levels in the outflowing nest air influenced turret construction in Atta vollenweideri...
2017: PloS One
https://www.readbyqxmd.com/read/29140963/when-the-momentum-has-gone-what-will-be-the-role-of-extracorporeal-lung-support-in-the-future
#9
Darryl Abrams, Matthew Bacchetta, Daniel Brodie
PURPOSE OF REVIEW: There has been expanding interest in and use of extracorporeal support in respiratory failure concurrent with technological advances and predominantly observational data demonstrating improved outcomes. However, until there is more available data from rigorous, high-quality randomized studies, the future of extracorporeal support remains uncertain. RECENT FINDINGS: Outcomes for patients supported with extracorporeal devices continue to show favorable trends...
November 14, 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/29138758/vaginoscopy-in-ewes-utilizing-a-laparoscopic-surgical-port-device
#10
Jeremiah Easley, Desiree Shasa, Eileen Hackett
Vaginoscopy allows for diagnostic evaluation and treatment of the vaginal vault. A laparoscopic surgical port device and rigid telescope were utilized for serial vaginoscopy in 8 healthy anesthetized ewes. Vaginoscopy examinations were performed in each ewe at days 1, 14, and 28. This technique was well-tolerated and facilitated carbon dioxide vaginal inflation, complete vaginal examination, identification of the cervix, and targeted biopsy collection. No complications were encountered during or following the vaginoscopy procedures...
2017: Journal of Veterinary Medicine
https://www.readbyqxmd.com/read/29135616/intermittent-extracorporeal-co2-removal-in-chronic-obstructive-pulmonary-disease-patients-a-fiction-or-an-option
#11
Francesco Alessandri, Francesco Pugliese, Luciana Mascia, Marco V Ranieri
PURPOSE OF REVIEW: Aim of this article is to review evidence recently generated on the application of extracorporeal carbon dioxide removal (ECCO2R) in patients with acute exacerbation of chronic obstructive pulmonary disease (COPD) requiring mechanical ventilation (invasive and non invasive) for hypercapnic respiratory failure. RECENT FINDINGS: To date, the paucity of evidences on ECCO2R to decrease the rate of noninvasive ventilation (NIV) failure and to wean hypercapnic patients from invasive mechanical ventilation (IMV) precludes to systematically apply this technology to COPD patients...
November 11, 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/29132006/ocean-acidification-dampens-physiological-stress-response-to-warming-and-contamination-in-a-commercially-important-fish-argyrosomus-regius
#12
Eduardo Sampaio, Ana R Lopes, Sofia Francisco, Jose R Paula, Marta Pimentel, Ana L Maulvault, Tiago Repolho, Tiago F Grilo, Pedro Pousão-Ferreira, António Marques, Rui Rosa
Increases in carbon dioxide (CO2) and other greenhouse gases emissions are changing ocean temperature and carbonate chemistry (warming and acidification, respectively). Moreover, the simultaneous occurrence of highly toxic and persistent contaminants, such as methylmercury, will play a key role in further shaping the ecophysiology of marine organisms. Despite recent studies reporting mostly additive interactions between contaminant and climate change effects, the consequences of multi-stressor exposure are still largely unknown...
November 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29116811/on-the-reactivity-of-lithium-%C3%AE-ketocarboxylates-the-role-of-lithium-salts
#13
Mateo Berton, Rossella Mello, Paul G Williard, María Elena González-Núñez
Lithium β-ketocarboxylates 1(COOLi), prepared by reaction of lithium enolates 2(Li(+)) with carbon dioxide, readily decarboxylate in THF solution unless in the presence of lithium salts, in which case they are indefinitely stable at room temperature under inert atmosphere. The availability of stable THF solutions of lithium β-ketocarboxylates 1(COOLi) in the absence of carbon dioxide allowed for reactions with nitrogen bases and alkyl halides 3 to give α-alkyl ketones 1(R) after acidic hydrolysis. The sequence then represents the use of carbon dioxide as a removable directing group for the selective monoalkylation of lithium enolates 2(Li(+))...
November 8, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29116149/constraints-on-global-temperature-target-overshoot
#14
K L Ricke, R J Millar, D G MacMartin
In the aftermath of the Paris Agreement, the climate science and policy communities are beginning to assess the feasibility and potential benefits of limiting global warming to 1.5 °C or 2 °C above preindustrial. Understanding the dependence of the magnitude and duration of possible temporary exceedance (i.e., "overshoot") of temperature targets on sustainable energy decarbonization futures and carbon dioxide (CO2) removal rates will be an important contribution to this policy discussion. Drawing upon results from the mitigation literature and the IPCC Working Group 3 (WG3) scenario database, we examine the global mean temperature implications of differing, independent pathways for the decarbonization of global energy supply and the implementation of negative emissions technologies...
November 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29099186/chiral-cadmium-ii-metal-organic-framework-from-an-achiral-ligand-by-spontaneous-resolution-an-efficient-heterogeneous-catalyst-for-the-strecker-reaction-of-ketones
#15
Ashish Verma, Kapil Tomar, Parimal K Bharadwaj
A thermally stable cadmium-based chiral metal-organic framework (MOF), {[Cd2(L)(H2O)(DMF)]·3DMF·2H2O}n (1; DMF = N,N-dimethylformamide), has been synthesized from an achiral ligand by spontaneous resolution. The MOF features 1D open channels with a large density of active metal sites and has a 3,6-c binodal net with a rare sit 3,6-conn topology. The metal-bound water and DMF solvents could be easily removed along with the guest molecules in the lattice upon activation to afford the desolvated framework 1'...
November 3, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29055848/modeling-the-economic-value-of-blue-carbon-in-delaware-estuary-wetlands-historic-estimates-and-future-projections
#16
Edward W Carr, Yosef Shirazi, George R Parsons, Porter Hoagland, Christopher K Sommerfield
Coastal wetlands sequester large amounts of carbon in their soils, effectively removing carbon dioxide from the atmosphere and acting as a carbon sink. In this paper, we estimate the economic value of carbon sequestered by wetlands in the Delaware Estuary. We estimate the value of the current stock of wetlands, the value of the historic loss of wetlands, and under a range of different scenarios the expected future loss. We use historical topographic maps and Land Cover inventories of the Delaware Estuary to measure the acreage of tidal wetlands in nine distinct time periods from 1778 to 2011...
October 19, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29054063/valorisation-of-tectona-grandis-tree-sawdust-through-the-production-of-high-activated-carbon-for-environment-applications
#17
Isabel Pestana da Paixão Cansado, Cristóvão Ramiro Belo, Paulo Alexandre Mira Mourão
This work presents a first approach concerning the use of Tectona Grandis tree sawdust (from East Timor) for high activated carbon production, by physical activation with carbon dioxide at different temperatures. The activated carbons (AC) obtained exhibit a well-developed porous structure with a pore size distribution varying from micro to mesopores. Selected AC was successfully evaluated for pesticide removal, specific to 4-chloro-2-methylphenoxyacetic acid, from the liquid phase. The results presented are very promising, allowing to establish that Tectona Grandis sawdust is as an excellent precursor for the basic AC production and allow to expect good performance of theses adsorbents on the removal of a broad range of pollutants...
October 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29040822/removal-of-lead-and-bisphenol-a-using-magnesium-silicate-impregnated-palm-shell-waste-powdered-activated-carbon-comparative-studies-on-single-and-binary-pollutant-adsorption
#18
Choe Earn Choong, Shaliza Ibrahim, Yeomin Yoon, Min Jang
In this work, palm shell waste powder activated carbon coated by magnesium silicate (PPAC-MS) were synthesized by the impregnation of magnesium silicate (MgSiO3) using economical material (silicon dioxide powder) via mild hydrothermal approach for the first time. As an effective adsorbent, PPAC-MS simultaneously removes BPA and Pb(II) in single and binary mode. Surprisingly, PPAC-MS exhibited a homogeneous thin plate mesh-like structure, as well as meso- and macropores with a high surface area of 772.1m(2)g(-1)...
October 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29028457/photocatalytic-degradation-of-p-cresol-using-tio2-zno-hybrid-surface-capped-with-polyaniline
#19
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
#20
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...
November 6, 2017: Inorganic Chemistry
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