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CO2 removal

Jowita Marszewska, Mietek Jaroniec
Highly-porous carbon spheres were prepared by modified Stöber method combined with silica templating and CO2 activation. Silica was delivered in the form of either colloids or tetraethyl orthosilicate and used to create porosity. Subsequently, CO2 activation was used to develop microporosity. CO2 activation was done either: (1) on carbon spheres, following silica etching or (2) on silica-carbon composites, before silica removal. Both methods delivered carbon materials with well-developed structures and, importantly, preserved spherical morphology...
October 15, 2016: Journal of Colloid and Interface Science
Benjamin S Gelfand, Racheal P S Huynh, Roger K Mah, George K H Shimizu
A crystalline and permanently porous copper phosphonate monoester framework has been synthesized from a tetraaryl trigonal phosphonate monoester linker. This material has a surface area over 1000 m(2)  g(-1) , as measured by N2 sorption, the highest reported for a phosphonate-based metal-organic framework (MOF). The monoesters result in hydrophobic pore surfaces that give a low heat of adsorption for CO2 and low calculated selectivity for CO2 over N2 and CH4 in binary mixtures. By careful manipulation of synthetic conditions, it is possible to selectively remove some of the monoesters lining the pore to form a hydrogen phosphonate while giving an isomorphous structure...
October 21, 2016: Angewandte Chemie
Sahar Soltan, Hoda Jafari, Shahrara Afshar, Omid Zabihi
In the present study, silicon dioxide (SiO2) nanoparticles were loaded to titanium dioxide (TiO2) nano-particles by sol-gel method to make a high porosity photocatalyst nano-hybrid. These photocatalysts were synthesized using titanium tetrachloride and tetraethyl orthosilicate as titanium and silicon sources, respectively, and characterized by X-ray powder diffraction (XRD) and scanning electron microscope methods. Subsequently, the optimizations of the component and operation conditions were investigated. Then, nano-sized TiO2 and TiO2-SiO2 were supported on concrete bricks by the dip coating process...
October 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Yan Yan Li, Xin Yu Ming Dong, Xiaodan Sun, Ying Wang, Jian Hua Zhu
To fabricate new solid base with high efficiency in adsorption of CO2 at 473 K and catalytic activity in degradation of nitrosamines, magnesium oxalate and copper nitrate were mixed with assistance of microwave irradiation followed by calcination to immobilize CuO among MgO particles. The binary solid base CuO-MgO is thus moderately reduced to form the Cu inserted MgO composite with highly exposed strong basic sites, and it can capture 34.6 mg g(-1) of CO2 in the harsh instantaneous adsorption at 473 K and keep a high strong basicity to trap the CO2 mixed with SO2 and NO...
October 20, 2016: ACS Applied Materials & Interfaces
Daniel W Birch, Jerry T Dang, Noah J Switzer, Namdar Manouchehri, Xinzhe Shi, Ghassan Hadi, Shahzeer Karmali
BACKGROUND: Intraoperative hypothermia during both open and laparoscopic abdominal surgery may be associated with adverse events. For laparoscopic abdominal surgery, the use of heated insufflation systems for establishing pneumoperitoneum has been described to prevent hypothermia. Humidification of the insufflated gas is also possible. Past studies on heated insufflation have shown inconclusive results with regards to maintenance of core temperature and reduction of postoperative pain and recovery times...
October 19, 2016: Cochrane Database of Systematic Reviews
Miko U F Kirschbaum, Louis A Schipper, Paul L Mudge, Susanna Rutledge, Nicolas J B Puche, David I Campbell
A possible agricultural climate change mitigation option is to increase the amount of soil organic carbon (SOC). Conversely, some factors might lead to inadvertent losses of SOC. Here, we explore the effect of various management options and environmental changes on SOC storage and milk production of dairy pastures in New Zealand. We used CenW 4.1, a process-based ecophysiological model, to run a range of scenarios to assess the effects of changes in management options, plant properties and environmental factors on SOC and milk production...
October 15, 2016: Science of the Total Environment
Chun Fang Ma, Qiang Gao, Kai Sheng Xia, Zhi Yuan Huang, Bo Han, Cheng Gang Zhou
The development of bilirubin adsorbents with high adsorption efficiencies towards albumin-bonded bilirubin is still a considerable challenge. In this work, a three-dimensionally porous graphene (3D-pGR) has been fabricated through a simple carbon dioxide (CO2) activation of thermally exfoliated graphite oxide (EGO). Intriguingly, the resultant 3D-pGR material showed hierarchically micro-meso-macroporous structure, high specific surface area of up to 843m(2)g(-1), and large pore volume as high as 2.71cm(3)g(-1)...
October 11, 2016: Colloids and Surfaces. B, Biointerfaces
Frank Juvenal, Adam Langlois, Antoine Bonnot, Daniel Fortin, Pierre D Harvey
The organometallic synthon trans-[p-MeSC6H4C≡C-Pt(PMe3)2-C≡CC6H4SMe] (L1) reacts with CuX (X = Cl, Br, I) in PrCN and PhCN to form 1D- or 2D-coordination polymers (CP) with a very high degree of variability of features. The copper-halide unit can be either the rhomboids Cu2X2 fragments or the step cubane Cu4I4. The CP's may also incorporate a crystallization solvent molecule or not, which may be coordinated to copper or not. Their characterizations were performed by X-ray crystallography, thermal gravimetric analysis (TGA), and IR, absorption, and emission spectra as well as photophysical measurements in the presence and absence of solvent crystallization molecules...
October 17, 2016: Inorganic Chemistry
Alyne O Lavinsky, Kelly C Detmann, Josimar V Reis, Rodrigo T Ávila, Matheus L Sanglard, Lucas F Pereira, Lílian M V P Sanglard, Fabrício A Rodrigues, Wagner L Araújo, Fábio M DaMatta
Silicon (Si) has been recognized as a beneficial element to improve rice (Oryza sativa L.) grain yield. Despite some evidence suggesting that this positive effect is observed when Si is supplied along the reproductive growth stage (from panicle initiation to heading), it remains unclear whether its supplementation during distinct growth phases can differentially impact physiological aspects of rice and its yield and the underlying mechanisms. Here, we investigated the effects of additions/removals of Si at different growth stages and their impacts on rice yield components, photosynthetic performance, and expression of genes (Lsi1, Lsi2 and Lsi6) involved in Si distribution within rice shoots...
October 5, 2016: Journal of Plant Physiology
M A Landrum, N A Cox, D E Cosby, M E Berrang, S M Russell
New regulations and performance standards for Campylobacter have been implemented by the USDA - Food Safety and Inspection Service (FSIS). The objective of this study was to evaluate treatment with a low pH processing aid (CMS(1) PoultrypHresh), a formulated low pH processing aid, to reduce numbers of Campylobacter which could help companies meet regulatory requirements. Two experiments (3 replicates each) were conducted. Experiment 1, in each of 3 replicates, skin-on split chicken breasts (n = 15) were obtained from a local grocery and divided into groups of 5...
October 12, 2016: Poultry Science
Geoffrey E Ciarlone, Jay B Dean
Central CO2 chemoreceptive neurons in the caudal solitary complex (cSC) are stimulated by hyperoxia via a free radical mechanism. Hyperoxia has been shown to increase superoxide and nitric oxide in the cSC, but it remains unknown how changes in pCO2 during hyperoxia affect the production of O2-dependent reactive oxygen and nitrogen species (RONS) downstream that can lead to increased levels of oxidative and nitrosative stress, cellular excitability, and potentially, dysfunction. We used real time fluorescence microscopy in rat brain slices to determine how hyperoxia and hypercapnic acidosis (HA) modulate one another in the production of key RONS, as well as colorimetric assays to measure levels of oxidized and nitrated lipids and proteins...
October 12, 2016: American Journal of Physiology. Cell Physiology
L Lombardi, E A Carnevale, I Pecorini
Low methane content landfill gas may be enriched by removing carbon dioxide. An innovative process, based on carbon dioxide capture and storage by means of accelerated carbonation of bottom ash is proposed and studied for the above purpose. Within this research framework we devoted a preliminary research activity to investigate the possibility of improving the way the contact between bottom ash and landfill gas takes place: this is the scope of the work reported in this paper. Two different types of reactors - fixed bed and rotating drum - were designed and constructed for this purpose...
September 29, 2016: Waste Management
M A Morales Mora, C Pretelín Vergara, M A Leiva, S A Martínez Delgadillo, E R Rosa-Domínguez
Post-combustion CO2 capture (PCC) of flue gas from an ammonia plant (AP) and the environmental performance of the carbon capture utilization (CCU) technology for greenhouse gas (GHG) emissions to an enhanced oil recovery (EOR) system in Mexico was performed as case study. The process simulations (PS) and life cycle assessment (LCA) were used as supporting tools to quantify the CO2 capture and their environmental impacts, respectively. Two scenarios were considered: 1) the AP with its shift and CO2 removal unit and 2) Scenario 1 plus PCC of the flue gas from the AP primary reformer (AP-2CO2) and the global warming (GW) impact...
December 1, 2016: Journal of Environmental Management
Anja Baraba, Sonja Pezelj-Ribaric, Marija Roguljić, Ivana Miletic
OBJECTIVE: The aim of this study was to investigate the cytotoxicity of two different bioactive root canal sealers: one based on mineral trioxide aggregate, MTA Fillapex (Angelus, Solucoes Odontologicas, Londrina, PR, Brazil), and the other based on bioceramics, Endosequence BC Sealer (Brasseler, Savannah, Georgia, USA), in culture of mouse L929 fibroblasts. MATERIALS AND METHODS: Mouse fibroblasts (L929), obtained from subcutaneous connective tissue of mouse line C3Hf, were cultivated in plastic culture flasks in an incubator at 37şC, with 5% CO2 and 90% humidity...
March 2016: Acta Stomatologica Croatica
Zhujian Huang, Pingxiao Wu, Beini Gong, Yaping Dai, Pen-Chi Chiang, Xiaolin Lai, Guangwei Yu
[This corrects the article DOI: 10.1371/journal.pone.0159802.].
2016: PloS One
Harshul Thakkar, Stephen Eastman, Amit Hajari, Ali A Rownaghi, James C Knox, Fateme Rezaei
Structured adsorbents, especially in the form of monolithic contactors, offer an excellent gas-solid contacting strategy for the development of practical and scalable CO2 capture technologies. In this study, the fabrication of three-dimensional (3D)-printed 13X and 5A zeolite monoliths with novel structures and their use in CO2 removal from air are reported. The physical and structural properties of these printed monoliths are evaluated and compared with their powder counterparts. Our results indicate that 3D-printed monoliths with zeolite loadings as high as 90 wt % exhibit adsorption uptake that is comparable to that of powder sorbents...
October 4, 2016: ACS Applied Materials & Interfaces
Mojgan Kachoei, Amir Mohammadi, Maziar Esmaili Moghaddam, Sahand Rikhtegaran, Mahmoud Pourghaznein, Sajjad Shirazi
Background. Failure of orthodontic bracket bonds is a common occurrence during orthodontic treatment. Different techniques have been suggested in the literature to remove resin residues from the bracket bases and enamel surfaces to prepare the surfaces again after debonding. This study attempted to compare multiple rebond shear strengths (SBS) of debonded brackets following preparation with sandblasting and CO2 laser. Methods. The brackets were bonded on 30 human and bovine maxillary central incisors using self-curing composite resin...
2016: Journal of Dental Research, Dental Clinics, Dental Prospects
Andrew J Schauer, Julia Kelson, Casey Saenger, Katharine W Huntington
RATIONALE: The clumped isotope composition of CO2 (Δ47 ) derived from carbonate is widely used as a paleotemperature proxy with broad applications in geoscience. Its accuracy is, however, limited by inter-laboratory discrepancies of reference materials and disagreement among carbonate geothermometer calibrations. Here we show how the correction for the abundance of (17) O influences these discrepancies. METHODS: We used CO2 -H2 O equilibration at known temperatures and phosphoric acid digested carbonates to generate CO2 samples with a wide range in (13) C and (18) O compositions...
September 21, 2016: Rapid Communications in Mass Spectrometry: RCM
Bharat Ugale, Sandeep Singh Dhankhar, C M Nagaraja
A series of three new isostructural metal-organic frameworks (MOFs) of nickel(II), [{Ni(muco)(bpa)(2H2O)}·2H2O] (1), [{Ni(muco)(bpe)(2H2O)}·2.5H2O] (2), and [{Ni(muco)(azopy)(2H2O)}·2H2O] (3) [where muco = trans,trans-muconate dianion, bpa = 1,2-bis(4-pyridyl)ethane, bpe = 1,2-bis(4-pyridyl)ethylene, and azopy = 4,4'-bis(azobipyridine)], have been synthesized and characterized by single-crystal X-ray diffraction analysis and other physicochemical methods. Compounds 1-3 exhibit an interesting 3-fold-interpenetrated three-dimensional pillar-layered framework structure constituted of 4-coordinating (4-c) Ni(II) nodes with {6(6)}-neb net topology...
October 3, 2016: Inorganic Chemistry
Pablo Tapia, Felipe Lillo, Dagoberto Soto, Leslie Escobar, Felipe Simon, Karina Hernández, Leyla Alegría, Alejandro Bruhn
A promising approach to facilitate protective mechanical ventilation is the use of extracorporeal CO2 removal techniques. Several strategies based on membrane gas exchangers have been developed. However, these techniques are still poorly available. The goal of this study was to assess the efficacy and safety of THAM infusion coupled to hemofiltration for the management of hypercapnic acidosis. A severe respiratory acidosis was induced in seven anesthetized pigs. Five of them were treated with THAM 8-mmol·kg(-1)·h(-1) coupled to hemofiltration (THAM+HF group) at 100 mL·kg(-1)·h(-1)...
2016: American Journal of Translational Research
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