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Co2 absorber

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https://www.readbyqxmd.com/read/28640914/kinetic-analysis-of-an-anion-exchange-absorbent-for-co2-capture-from-ambient-air
#1
Xiaoyang Shi, Qibin Li, Tao Wang, Klaus S Lackner
This study reports a preparation method of a new moisture swing sorbent for CO2 capture from air. The new sorbent components include ion exchange resin (IER) and polyvinyl chloride (PVC) as a binder. The IER can absorb CO2 when surrounding is dry and release CO2 when surrounding is wet. The manuscript presents the studies of membrane structure, kinetic model of absorption process, performance of desorption process and the diffusivity of water molecules in the CO2 absorbent. It has been proved that the kinetic performance of CO2 absorption/desorption can be improved by using thin binder and hot water treatment...
2017: PloS One
https://www.readbyqxmd.com/read/28624742/ionic-liquids-toxicity-on-fresh-water-microalgae-scenedesmus-quadricauda-chlorella-vulgaris-botryococcus-braunii-selection-criterion-for-use-in-a-two-phase-partitioning-bioreactor-tppbr
#2
Khurrum Shehzad Quraish, Mohamad Azmi Bustam, Sooridarsan Krishnan, Noor Fathanah Aminuddin, Noraisyah Azeezah, Noraini Abd Ghani, Yoshimitsu Uemura, Jean Marc Lévêque
A promising method of Carbon dioxide (CO2) valorization is to use green microalgae photosynthesis to process biofuel. Two Phase Partitioning Bioreactors (TPPBR) offer the possibility to use non-aqueous phase liquids (NAPL) to enhance CO2 solubility; thus making CO2 available to maximize algae growth. This requires relatively less toxic hydrophobic Ionic Liquids (ILs) that comprise a new class of ionic compounds with remarkable physicochemical properties and thus qualifies them as NAPL candidates. This paper concerns the synthesis of ILs with octyl and butyl chains as well as different cations containing aromatic (imidazolium, pyridinium) and non-aromatic (piperidinum, pyrrolidinium) rings for CO2 absorption studies...
June 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28608900/theoretical-and-experimental-studies-on-three-water-stable-isostructural-paddlewheel-based-semiconducting-metal-organic-frameworks
#3
Xiaowei Yang, Yuan Zhang, Feng Li, Tiantian Guo, Yong Wu, Fengyan Jin, Min Fang, Yaqian Lan, Yafei Li, Yong Zhou, Zhigang Zou
Three water-stable isostructural metal-organic frameworks (MOFs) of the general formula [M2(TCS)(BPY)] (M = Co(1), Ni(2) and Cu(3); H4TCS = tetrakis(4-carboxyphenyl) silane, BPY = 4,4'-bipyridine) were synthesized and fully characterized. MOFs 1-3 are stable in pH = 5-11, 2-11, 3-11 aqueous solution respectively for at least 24 h at room temperature. Although H4TCS absorbs only UV light, MOFs 1-3 absorb both UV and visible light in broad ranges (250-800 nm) and absorb more visible light than the ligand BPY...
June 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28608682/powering-a-co2-reduction-catalyst-with-visible-light-through-multiple-sub-picosecond-electron-transfers-from-a-quantum-dot
#4
Shichen Lian, Mohamad S Kodaimati, Dmitriy S Dolzhnikov, Raul Calzada, Emily A Weiss
Photosensitization of molecular catalysts to reduce CO2 to CO is a sustainable route to storable solar fuels. Crucial to the sensitization process is highly efficient transfer of redox equivalents from sensitizer to catalyst; in systems with molecular sensitizers, this transfer is often slow because it is gated by diffusion-limited collisions between sensitizer and catalyst. This article describes the photosensitization of a meso-tetraphenylporphyrin iron(III) chloride (FeTPP) catalyst by colloidal, heavy metal-free CuInS2/ZnS quantum dots (QDs) to reduce CO2 to CO using 450 nm light...
June 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28599706/quantitative-chiral-analysis-of-amino-acids-in-solution-using-enantiomer-selective-photodissociation-of-cold-gas-phase-tryptophan-via-chiral-recognition
#5
Akimasa Fujihara, Naoto Maeda
To explore the origin of biomolecule homochirality in interstellar molecular clouds, enantiomer-selective photodissociation via chiral recognition between amino acids in the gas phase was examined using a tandem mass spectrometer containing an electrospray ionization source and a cold ion trap. Ultraviolet photodissociation mass spectra of cold gas-phase noncovalent complexes of sodiated l-tryptophan ion, Na(+)(l-Trp), with an amino acid such as serine (Ser), threonine (Thr), or alanine (Ala) were obtained by the photo-excitation of l-Trp in the noncovalent complexes...
August 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28581705/characteristics-of-nano3-promoted-cdo-as-a-midtemperature-co2-absorbent
#6
Kang-Yeong Kim, Jin-Su Kwak, Young-In An, Kyung-Ryul Oh, Young-Uk Kwon
In this study, we explored the reaction system CdO(s) + CO2(g) ⇄ CdCO3(s) as a model system for CO2 capture agent in the intermediate temperature range of 300-400 °C. While pure CdO does not react with CO2 at all up to 500 °C, CdO mixed with an appropriate amount of NaNO3 (optimal molar ratio NaNO3/CdO = 0.14) greatly enhances the conversion of CdO into CdCO3 up to ∼80% (5.68 mmol/g). These NaNO3-promoted CdO absorbents can undergo many cycles of absorption and desorption by temperature swing between 300 and 370 °C under a 100% CO2 condition...
June 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28575237/inside-out-efflux-of-carbon-dioxide-from-leaves-represents-more-than-leaf-metabolism
#7
Samantha S Stutz, Jeremiah Anderson, Rachael Zulick, David T Hanson
High concentrations of inorganic carbon in the xylem, produced from root, stem, and branch respiration, travel via the transpiration stream and eventually exit the plant through distant tissues as CO2. Unlike previous studies that focused on the efflux of CO2 from roots and woody tissues, we focus on efflux from leaves and the potential effect on leaf respiration measurements. We labeled transported inorganic carbon, spanning reported xylem concentrations, with 13C and then manipulated transpiration rates in the dark in order to vary the rates of inorganic carbon supply to cut leaves from Brassica napus and Populus deltoides...
May 30, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28562020/evaluation-and-modeling-of-vapor-liquid-equilibrium-and-co2-absorption-enthalpies-of-aqueous-designer-diamines-for-post-combustion-capture-processes
#8
Weiliang Luo, Qi Yang, William Conway, Graeme Puxty, Paul Feron, Jian Chen
Novel absorbents with improved characteristics are required to reduce the existing cost and environmental barriers to deployment of large scale CO2 capture. Recently, bespoke absorbent molecules have been specifically designed for CO2 capture applications, and their fundamental properties and suitability for CO2 capture processes evaluated. From the study, two unique diamine molecules, 4-(2-hydroxyethylamino)piperidine (A4) and 1-(2-hydroxyethyl)-4-aminopiperidine (C4), were selected for further evaluation including thermodynamic characterization...
June 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28551365/low-dose-ionizing-radiation-limitations-to-seed-germination-results-from-a-model-linking-physiological-characteristics-and-developmental-dynamics-simulation-strategy
#9
Hui Liu, Dawei Hu, Chen Dong, Yuming Fu, Guanghui Liu, Youcai Qin, Yi Sun, Dianlei Liu, Lei Li, Hong Liu
There is much uncertainty about the risks of seed germination after repeated or protracted environmental low-dose ionizing radiation exposure. The purpose of this study is to explore the influence mechanism of low-dose ionizing radiation on wheat seed germination using a model linking physiological characteristics and developmental-dynamics simulation. A low-dose ionizing radiation environment simulator was built to investigate wheat (Triticum aestivum L.) seeds germination process and then a kinetic model expressing the relationship between wheat seed germination dynamics and low-dose ionizing radiation intensity variations was developed by experimental data, plant physiology, relevant hypotheses and system dynamics, and sufficiently validated and accredited by computer simulation...
May 24, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28537771/atmospheric-constraints-on-the-surface-uv-environment-of-mars-at-3-9%C3%A2-ga-relevant-to-prebiotic-chemistry
#10
Sukrit Ranjan, Robin Wordsworth, Dimitar D Sasselov
Recent findings suggest that Mars may have been a clement environment for the emergence of life and may even have compared favorably to Earth in this regard. These findings have revived interest in the hypothesis that prebiotically important molecules or even nascent life may have formed on Mars and been transferred to Earth. UV light plays a key role in prebiotic chemistry. Characterizing the early martian surface UV environment is key to understanding how Mars compares to Earth as a venue for prebiotic chemistry...
May 24, 2017: Astrobiology
https://www.readbyqxmd.com/read/28534403/laminated-and-two-dimensional-carbon-supported-microwave-absorbers-derived-from-mxenes
#11
Meikang Han, Xiaowei Yin, Xinliang Li, Babak Anasori, Litong Zhang, Laifei Cheng, Yury Gogotsi
Microwave absorbers with layered structures that can provide abundant interfaces are highly desirable for enhancing electromagnetic absorbing capability and decreasing the thickness. The atomically thin layers of two-dimensional (2D) transition-metal carbides (MXenes) make them a convenient precursor for synthesis of other 2D and layered structures. Here, laminated carbon/TiO2 hybrid materials composed of well-aligned 2D carbon sheets with embedded TiO2 nanoparticles were synthesized and showed excellent microwave absorption...
May 31, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28481540/fabrication-of-photoreactive-biocomposite-coatings-via-electric-field-assisted-assembly-of-cyanobacteria
#12
Oscar I Bernal, Bhuvnesh Bharti, Michael C Flickinger, Orlin D Velev
We report how dielectrophoresis (DEP) can be used as a tool for the fabrication of biocomposite coatings of photoreactive cyanobacteria (Synechococcus PCC7002) on flexible polyester sheets (PEs). The PE substrates were precoated by a layer-by-layer assembled film of charged polyelectrolytes. In excellent agreement between experimental data and numerical simulations, the directed assembly process driven by external electric field results in the formation of 1D chains and 2D sheets by the cells. The preassembled cyanobacteria chains and arrays became deposited on the substrate and remained in place after the electric field was turned off due to the electrostatic attraction between the negatively charged cell surfaces and the positively charged polyelectrolyte-coated PE...
May 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28471506/co2-assisted-activating-cellulose-for-preparation-of-superhydrophobic-nanocoating
#13
Jinfang Wang, Zhimin Xue, Tingting Yu, Zhimin Liu, Tiancheng Mu
There is increasing demand for superhydrophobic materials which could be used for separating oil and water efficiently. In order to avoid secondary pollution, it is desirable to prepare such materials with green technology. Here we present an environment benign method for fabricating superhydrophobic materials by using organic base based solvents in which cellulose can be dissolved and activated. Then dissolved cellulose could be chemical modified with green silanization reagent, and the solvent can be recycled after CO2 is removed...
May 4, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28470317/can-the-tricyanomethanide-anion-improve-co2-absorption-by-acetate-based-ionic-liquids
#14
L F Lepre, J Szala-Bilnik, L Pison, M Traïkia, A A H Pádua, R A Ando, M F Costa Gomes
Carbon dioxide absorption by mixtures of two ionic liquids with a common cation-1-butyl-3-methylimidazolium acetate, [C4C1Im][OAc], and 1-butyl-3-methylimidazolium tricyanomethanide, [C4C1Im][C(CN)3]-was determined experimentally at pressures below atmospheric pressure as a function of temperature between 303 K and 343 K, and at 303 K as a function of pressure up to 10 bar. It is observed that the absorption of carbon dioxide decreases with increasing tricyanomethanide anion concentration and with increasing temperature, showing a maximum of 0...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28467843/sphere-shaped-mn3o4-catalyst-with-remarkable-low-temperature-activity-for-methyl-ethyl-ketone-combustion
#15
Hua Pan, Yanfei Jian, Changwei Chen, Chi He, Zhengping Hao, Zhenxing Shen, Hongxia Liu
Mn3O4, FeMnOx, and FeOx catalysts synthesized via a solvothermal method were employed for catalytic oxidation of methyl-ethyl-ketone (MEK) at low temperature. Mn3O4 with sphere-like morphology exhibited the highest activity for MEK oxidation, over which MEK was completely oxidized to CO2 at 200 °C, and this result can be comparable to typical noble metal loaded catalysts. The activation energy of MEK over Mn3O4 (30.8 kJ/mol) was much lower than that of FeMnOx (41.5 kJ/mol) and FeOx (47.8 kJ/mol). The dominant planes, surface manganese species ratio, surface-absorbed oxygen, and redox capability played important roles in the catalytic activities of catalysts, while no significant correlation was found between specific surface area and MEK removal efficiency...
June 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28452027/development-of-a-mechanistic-model-for-prediction-of-co2-capture-from-gas-mixtures-by-amine-solutions-in-porous-membranes
#16
Mehdi Ghadiri, Azam Marjani, Saeed Shirazian
A mechanistic model was developed in order to predict capture and removal of CO2 from air using membrane technology. The considered membrane was a hollow-fiber contactor module in which gas mixture containing CO2 was assumed as feed while 2-amino-2-metyl-1-propanol (AMP) was used as an absorbent. The mechanistic model was developed according to transport phenomena taking into account mass transfer and chemical reaction between CO2 and amine in the contactor module. The main aim of modeling was to track the composition and flux of CO2 and AMP in the membrane module for process optimization...
April 27, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28437744/fe-%C3%A2-ions-enhanced-catalytic-properties-of-bio-2co3-nanowires-and-mechanism-study-for-complete-degradation-of-xanthate
#17
Yujiao Guo, Kuixin Cui, Mingyi Hu, Shengming Jin
The wire-like Fe(3+)-doped (BiO)2CO3 photocatalyst was synthesized by a hydrothermal method. The photocatalytic property of Fe(3+)-doped (BiO)2CO3 nanowires was evaluated through degradation of sodium isopropyl xanthate under UV-visible light irradiation. The as-prepared Fe(3+)-doped (BiO)2CO3 nanowires were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) in detail...
April 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28419724/a-reversed-photosynthesis-like-process-for-light-triggered-co2-capture-release-and-conversion
#18
Dingguan Wang, Shenglong Liao, Shiming Zhang, Yapei Wang
Materials for CO2 capture have been extensively exploited for climate governance and gas separation. However, their regeneration is facing the problems of high energy cost and secondary CO2 contamination. Herein, a reversed photosynthesis-like process is proposed, in which CO2 is absorbed in darkness while being released under light illumination. The process is likely supplementary to natural photosynthesis of plants, in which, on the contrary, CO2 is released during the night. Remarkably, the material used here is able to capture 9...
April 16, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28400735/a-novel-stopped-flow-assay-for-quantitating-carbonic-anhydrase-activity-and-assessing-red-blood-cell-hemolysis
#19
Pan Zhao, R Ryan Geyer, Walter F Boron
We report a novel carbonic-anhydrase (CA) assay and its use for quantitating red-blood-cell (RBC) lysis during stopped-flow (SF) experiments. We combine two saline solutions, one containing HEPES/pH 7.03 and the other, ~1% CO2/44 mM [Formula: see text]/pH 8.41, to generate an out-of-equilibrium CO2/[Formula: see text] solution containing ~0.5% CO2/22 [Formula: see text]/pH ~7.25 (10°C) in the SF reaction cell. CA catalyzes relaxation of extracellular pH to ~7.50: [Formula: see text] + H(+) → CO2 + H2O. Proof-of-concept studies (no intact RBCs) show that the pH-relaxation rate constant (kΔpH)-measured via pyranine fluorescence-rises linearly with increases in [bovine CAII] or [murine-RBC lysate]...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28399328/high-throughput-label-free-single-cell-microalgal-lipid-screening-by-machine-learning-equipped-optofluidic-time-stretch-quantitative-phase-microscopy
#20
Baoshan Guo, Cheng Lei, Hirofumi Kobayashi, Takuro Ito, Yaxiaer Yalikun, Yiyue Jiang, Yo Tanaka, Yasuyuki Ozeki, Keisuke Goda
The development of reliable, sustainable, and economical sources of alternative fuels to petroleum is required to tackle the global energy crisis. One such alternative is microalgal biofuel, which is expected to play a key role in reducing the detrimental effects of global warming as microalgae absorb atmospheric CO2 via photosynthesis. Unfortunately, conventional analytical methods only provide population-averaged lipid amounts and fail to characterize a diverse population of microalgal cells with single-cell resolution in a non-invasive and interference-free manner...
May 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
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