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Co2 absorber

Haiyang Zhang, Ruili Guo, Jinpeng Hou, Zhong Wei, Xueqin Li
In this study, a carbon nanotubes composite coated with N-isopropylacrylamide hydrogel (NIPAM-CNTs) has been synthesized. Mixed matrix membranes (MMMs) were fabricated by incorporating NIPAM-CNTs composite filler into poly(ether-block-amide) (Pebax® MH 1657) matrix for efficient CO2 separation. The as-prepared NIPAM-CNTs composite filler mainly plays two roles: i) The extraordinary smooth one-dimensional nanochannels of CNTs act as the highways to accelerate CO2 transport through membranes, increasing CO2 permeability; ii) The NIPAM hydrogel layer coated on the outer walls of CNTs acts as the super water absorbent to increase water content of membranes, appealing both CO2 permeability and CO2/gas selectivity...
October 10, 2016: ACS Applied Materials & Interfaces
Rachael M Heuer, Martin Grosell
Energetic costs associated with ion and acid-base regulation in response to ocean acidification have been predicted to decrease the energy available to fish for basic life processes. However, the low cost of ion regulation (6-15% of standard metabolic rate) and inherent variation associated with whole-animal metabolic rate measurements have made it difficult to consistently demonstrate such a cost. Here we aimed to gain resolution in assessing the energetic demand associated with acid-base regulation by examining ion movement and O2 consumption rates of isolated intestinal tissue from Gulf toadfish acclimated to control or 1900 μatm CO2 (projected for year 2300)...
September 29, 2016: Scientific Reports
Lin Li, Guoqiang Zhang, Qinhong Wang
BACKGROUND: Microalgae, which can absorb carbon dioxide and then transform it into lipid, are promising candidates to produce renewable energy, especially biodiesel. The paucity of genomic information, however, limits the development of genome-based genetic modification to improve lipid production in many microalgae. Here, we describe the de novo sequencing, transcriptome assembly, annotation and differential expression analysis for Chlorella sorokiniana cultivated in different conditions to reveal the change of genes expression associated with lipid accumulation and photosynthetic carbon fixation...
September 26, 2016: BMC Microbiology
Cristian Moya, Noelia Alonso-Morales, Miguel A Gilarranz, Juan J Rodriguez, Jose Palomar
The potential advantages of applying encapsulated ionic liquid (ENIL) to CO2 capture by chemical absorption with 1-butyl-3-methylimidazolium acetate [bmim][acetate] are evaluated. The [bmim][acetate]-ENIL is a particle material with solid appearance and 70 % w/w in ionic liquid (IL). The performance of this material as CO2 sorbent was evaluated by gravimetric and fixed-bed sorption experiments at different temperatures and CO2 partial pressures. ENIL maintains the favourable thermodynamic properties of the neat IL regarding CO2 absorption...
September 19, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Yuye Zhang, Zhixin Zhou, Yanfei Shen, Qing Zhou, Jianhai Wang, Anran Liu, Songqin Liu, Yuanjian Zhang
Responsive assembly of 2D materials is of great interest for a range of applications. In this work, interfacial functionalized carbon nitride (CN) nanofibers were synthesized by hydrolyzing bulk CN in sodium hydroxide solution. The reversible assemble and disassemble behavior of the as-prepared CN nanofibers was investigated by using CO2 as a trigger to form a hydrogel network at first. Compared to the most widespread absorbent materials such as active carbon, graphene and previously reported supramolecular gel, the proposed CN hydrogel not only exhibited a competitive absorbing capacity (maximum absorbing capacity of methylene blue up to 402 mg/g) but also overcame the typical deficiencies such as poor selectivity and high energy-consuming regeneration...
September 27, 2016: ACS Nano
Charles V Brand, Edward Graham, Javier Rodríguez, Amparo Galindo, George Jackson, Claire S Adjiman
Predictive models play an important role in the design of post-combustion processes for the capture of carbon dioxide (CO2) emitted from power plants. A rate-based absorber model is presented to investigate the reactive capture of CO2 using aqueous monoethanolamine (MEA) as a solvent, integrating a predictive molecular-based equation of state: SAFT-VR SW (Statistical Associating Fluid Theory-Variable Range, Square Well). A distinctive physical approach is adopted to model the chemical equilibria inherent in the process...
October 20, 2016: Faraday Discussions
Bowen Deng, Juanjuan Tang, Xuhui Mao, Yuqiao Song, Hua Zhu, Wei Xiao, Dihua Wang
Efficient and high-flux capture of CO2 is the prerequisite of its utilization. Static absorption of CO2 with solid Li2O and molten salts (Li2O-free and Li2O-containing Li-Na-K carbonates) was investigated using a reactor with in situ pressure monitoring. The absorption capacity of dissolved Li2O was 0.835 molCO2/molLi2O at 723 K, larger than that of solid Li2O. For the solid Li2O absorbents, formation of solid Li2CO3 on the surface can retard the further reactions between Li2O and CO2, whereas the dissociation/dissolution effect of molten carbonate on Li2O improved the mass-specific absorption capacity of liquid Li2O...
October 4, 2016: Environmental Science & Technology
Takatoshi Sakamoto, Shigeto Kachi, Shohei Nakamura, Shinsuke Miki, Hideaki Kitajima, Hiroshi Yuasa
This study investigated how the inclusion of magnesium oxide (MgO) maintained tablet hardness during storage in an unpackaged state. Tablets were prepared with a range of MgO levels and stored at 40°C with 75% relative humidity for up to 14 d. The hardness of tablets prepared without MgO decreased over time. The amount of added MgO was positively associated with tablet hardness and mass from an early stage during storage. Investigation of the water sorption properties of the tablet components showed that carmellose water sorption correlated positively with the relative humidity, while MgO absorbed and retained moisture, even when the relative humidity was reduced...
2016: Chemical & Pharmaceutical Bulletin
Wooyul Kim, Eran Edri, Heinz Frei
Artificial photosynthesis is an attractive approach for renewable fuel generation because it offers the prospect of a technology suitable for deployment on highly abundant, non-arable land. Recent leaps forward in the development of efficient and durable light absorbers and catalysts for oxygen evolution and the growing attention to catalysts for carbon dioxide activation brings into focus the tasks of hierarchically integrating the components into assemblies for closing of the photosynthetic cycle. A particular challenge is the efficient coupling of the multi-electron processes of CO2 reduction and H2O oxidation...
September 20, 2016: Accounts of Chemical Research
Dengxu Wang, Shengyu Feng, Hongzhi Liu
Two series of new polyhedral oligomeric silsesquioxane (POSS)-based fluorescent hybrid porous polymers, HPP-1 and HPP-2, have been prepared by the Heck reaction of octavinylsilsesquioxane with 2,2',7,7'-tetrabromo-9,9'-spirobifluorene and 1,3,6,8-tetrabromopyrene, respectively. Three sets of reaction conditions were employed to assess their effect on fluorescence. These materials exhibit tunable fluorescence from nearly no fluorescence to bright fluorescence both in the solid state and dispersed in ethanol under UV light irradiation by simply altering the reaction conditions...
September 26, 2016: Chemistry: a European Journal
Xinwei Yang, Wenqiang Liu, Jian Sun, Yingchao Hu, Wenyu Wang, Hongqiang Chen, Yang Zhang, Xian Li, Minghou Xu
New alkali-doped (Na2 CO3 and K2 CO3 ) Li4 SiO4 sorbents with excellent performance at low CO2 concentrations were synthesized. We speculate that alkali doping breaks the orderly arrangement of the Li4 SiO4 crystals, hence increasing its specific surface area and the number of pores. It was shown that 10 wt % Na2 CO3 and 5 wt % K2 CO3 are the optimal additive ratios for doped sorbents to attain the highest conversions. Moreover, under 15 vol % CO2 , the doped sorbents present clearly faster absorption rates and exhibit stable cyclic durability with impressive conversions of about 90 %, at least 20 % higher than that of non-doped Li4 SiO4 ...
September 8, 2016: ChemSusChem
Lennart T Bach, Jan Taucher, Tim Boxhammer, Andrea Ludwig, Eric P Achterberg, María Algueró-Muñiz, Leif G Anderson, Jessica Bellworthy, Jan Büdenbender, Jan Czerny, Ylva Ericson, Mario Esposito, Matthias Fischer, Mathias Haunost, Dana Hellemann, Henriette G Horn, Thomas Hornick, Jana Meyer, Michael Sswat, Maren Zark, Ulf Riebesell
Every year, the oceans absorb about 30% of anthropogenic carbon dioxide (CO2) leading to a re-equilibration of the marine carbonate system and decreasing seawater pH. Today, there is increasing awareness that these changes-summarized by the term ocean acidification (OA)-could differentially affect the competitive ability of marine organisms, thereby provoking a restructuring of marine ecosystems and biogeochemical element cycles. In winter 2013, we deployed ten pelagic mesocosms in the Gullmar Fjord at the Swedish west coast in order to study the effect of OA on plankton ecology and biogeochemistry under close to natural conditions...
2016: PloS One
Yue Zhang, Brice Freeman, Pingjiao Hao, Gary T Rochelle
A hybrid system combining amine scrubbing with membrane technology for carbon capture from natural gas combined cycle (NGCC) power plants is proposed in this paper. In this process, the CO2 in the flue gas can be enriched from 4% to 18% by the membrane, and the amine scrubbing system will have lower capture costs. Aqueous piperazine (PZ) is chosen as the solvent. Different direct contact cooler (DCC) options, multiple absorber operating conditions, optimal intercooling designs, and different cooling options have been evaluated across a wide range of inlet CO2...
October 20, 2016: Faraday Discussions
Joshuah K Stolaroff, Congwang Ye, James S Oakdale, Sarah E Baker, William L Smith, Du T Nguyen, Christopher M Spadaccini, Roger D Aines
Purpose-designed, water-lean solvents have been developed to improve the energy efficiency of CO2 capture from power plants, including CO2-binding organic liquids (CO2BOLs) and ionic liquids (ILs). Many of these solvents are highly viscous or change phases, posing challenges for conventional process equipment. Such problems can be overcome by encapsulation. Micro-Encapsulated CO2 Sorbents (MECS) consist of a CO2-absorbing solvent or slurry encased in spherical, CO2-permeable polymer shells. The resulting capsules have diameters in the range of 100-600 μm, greatly increasing the surface area and CO2 absorption rate of the encapsulated solvent...
October 20, 2016: Faraday Discussions
Vladimir Sukhov, Lyubov Surova, Ekaterina Morozova, Oksana Sherstneva, Vladimir Vodeneev
Local stimulation induces generation and propagation of electrical signals, including the variation potential (VP) and action potential, in plants. Burning-induced VP changes the physiological state of plants; specifically, it inactivates photosynthesis. However, the mechanisms that decrease photosynthesis are poorly understood. We investigated these mechanisms by measuring VP-connected systemic changes in CO2 assimilation, parameters of light reactions of photosynthesis, electrochromic pigment absorbance shifts, and light scattering...
2016: Frontiers in Plant Science
Rujiao Zhang, Laping He, Ling Zhang, Cuiqin Li, Qiujin Zhu
Cardiovascular and cerebrovascular diseases seriously harm human health, and Bifidobacterium is the most beneficial probiotic in the gastrointestinal tract of humans. This work aimed to screen cholesterol-lowering Bifidobacterium from Guizhou Xiang Pig and evaluate its tolerance to oxygen, acid, and bile. Twenty-seven aerotolerant strains with similar colony to Bifidobacterium were isolated through incubation at 37℃ in 20% (v/v) CO2-80% (v/v) atmospheric air by using Mupirocin lithium modified MRS agar medium, modified PTYG with added CaCO3, and modified PTYG supplemented with X-gal...
2016: Korean Journal for Food Science of Animal Resources
Noriko Ishikawa, Atsushi Takabayashi, Ko Noguchi, Youshi Tazoe, Hiroshi Yamamoto, Susanne von Caemmerer, Fumihiko Sato, Tsuyoshi Endo
C4 photosynthesis exhibits efficient CO2 assimilation in ambient air by concentrating CO2 around ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) through a metabolic pathway called the C4 cycle. It has been suggested that cyclic electron flow (CEF) around PS I mediated by chloroplast NADH dehydrogenase-like complex (NDH), an alternative pathway of photosynthetic electron transport (PET), plays a crucial role in C4 photosynthesis, although the contribution of NDH-mediated CEF is small in C3 photosynthesis...
August 6, 2016: Plant & Cell Physiology
Qiao Kong, Dohyung Kim, Chong Liu, Yi Yu, Yude Su, Yifan Li, Peidong Yang
Reducing carbon dioxide with a multicomponent artificial photosynthetic system, closely mimicking nature, represents a promising approach for energy storage. Previous works have focused on exploiting light-harvesting semiconductor nanowires (NW) for photoelectrochemical water splitting. With the newly developed CO2 reduction nanoparticle (NP) catalysts, direct interfacing of these nanocatalysts with NW light absorbers for photoelectrochemical reduction of CO2 becomes feasible. Here, we demonstrate a directed assembly of NP catalysts on vertical NW substrates for CO2-to-CO conversion under illumination...
September 14, 2016: Nano Letters
Luca Ciaffoni, John H Couper, Graham Richmond, Gus Hancock, Grant A D Ritchie
Respiratory physicians use bronchoscopy for visual assessment of the lungs' topography and collecting tissue samples for external analysis. We propose a novel bronchoscope tool that would enable spatially dependent measurements of the functioning of the lungs by determining local concentrations of carbon dioxide, which will be produced by healthy parts of the lung at rates that are higher than from portions where gas exchange is impaired. The gas analyzer is based on a compact laser absorption spectrometer making use of fiber optics for delivery and return of low intensity diode laser radiation to and from the measurement chamber at the distal end of a flexible conduit...
September 6, 2016: Analytical Chemistry
Yu-Jeng Lin, Eric Chen, Gary T Rochelle
Alternative stripping processes have been proposed to reduce energy use for CO2 capture, but only a few have been applied to pilot-scale experiments. This paper presents the first pilot plant test results of one of the most promising stripper configurations, the advanced flash stripper with cold and warm rich solvent bypass. The campaign using aqueous piperazine was carried out at UT Austin in 2015. The advanced flash stripper improves the heat duty by over 25% compared to previous campaigns using the two-stage flash, achieving 2...
October 20, 2016: Faraday Discussions
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