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https://www.readbyqxmd.com/read/28800535/computational-investigation-of-the-nitrosation-mechanism-of-piperazine-in-co2-capture
#1
Qi Yu, Pan Wang, Fangfang Ma, Hong-Bin Xie, Ning He, Jingwen Chen
Quantum chemistry calculations and kinetic modeling were performed to investigate the nitrosation mechanism and kinetics of diamine piperazine (PZ), an alternative solvent for widely used monoethanolamine in postcombustion CO2 capture (PCCC), by two typical nitrosating agents, NO2(-) and N2O3, in the presence of CO2. Various PZ species and nitrosating agents formed by the reactions of PZ, NO2(-), and N2O3 with CO2 were considered. The results indicated that the reactions of PZ species having NH group with N2O3 contribute the most to the formation of nitrosamines in the absorber unit of PCCC and follow a novel three-step nitrosation mechanism, which is initiated by the formation of a charge-transfer complex...
August 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28756864/preparation-and-characterization-of-carbonic-anhydrase-conjugated-liposomes-for-catalytic-synthesis-of-calcium-carbonate-particles
#2
Keisuke Maeshima, Makoto Yoshimoto
The biomimetic approach using immobilized enzymes is useful for the synthesis of structurally defined inorganic materials. In this work, carbonic anhydrase (CA) from bovine erythrocytes was covalently conjugated at 25°C to the liposomes composed of 15mol% 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine-N-(glutaryl) (NG-POPE), and the zwitterionic and anionic phospholipids with the same acyl chains as NG-POPE. For the conjugation, the carboxyl groups of liposomal NG-POPE were activated with 11mM 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and 4...
October 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28745768/the-sos-chromotest-applied-for-screening-plant-antigenotoxic-agents-against-ultraviolet-radiation
#3
J L Fuentes, A García Forero, N Quintero Ruiz, C A Prada Medina, N Rey Castellanos, D A Franco Niño, D A Contreras García, Y Córdoba Campo, E E Stashenko
In this work, we investigated the usefulness of the SOS Chromotest for screening plant antigenotoxic agents against ultraviolet radiation (UV). Fifty Colombian plant extracts obtained by supercritical fluid (CO2) extraction, twelve plant extract constituents (apigenin, carvacrol, β-caryophyllene, 1,8-cineole, citral, p-cymene, geraniol, naringenin, pinocembrin, quercetin, squalene, and thymol) and five standard antioxidant and/or photoprotective agents (curcumin, epigallocatechin gallate, resveratrol, α-tocopherol, and Trolox®) were evaluated for their genotoxicity and antigenotoxicity against UV using the SOS Chromotest...
July 26, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28743996/antecedent-soil-moisture-prior-to-freezing-can-affect-quantity-composition-and-stability-of-soil-dissolved-organic-matter-during-thaw
#4
Haohao Wu, Xingkai Xu, Weiguo Cheng, Pingqing Fu, Fayun Li
There are large amounts of dissolved organic matter (DOM) released into the soil during spring thaw, but its bioavailability and components are still unknown. The quantity, composition and stability of DOM in water extracts of forest soils during thaw were studied after two-month freezing with 9 levels of soil moisture ranging from 10% to 90% water-filled pore space (WFPS), by measuring soil carbon dioxide (CO2) flux, biodegradable dissolved organic carbon (BDOC) and nitrogen (BDON), ultraviolet absorbance and parallel factor analysis of fluorescence excitation-emission matrices...
July 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28742934/efficient-photoelectrochemical-reduction-of-co2-to-formic-acid-with-functionalized-ionic-liquid-as-absorbent-and-electrolyte
#5
Weiwei Lu, Bo Jia, Beilei Cui, Yuan Zhang, Kaisheng Yao, Yuling Zhao, Jian Ji Wang
Photoelectrochemical (PEC) reduction of CO2 is a potential way to produce fuels and chemicals by using C1-feedstock accumulated in the atmosphere. However, low solubility of CO2 in water and complicated processes of capture and conversion make the conversion efficiency quite low. In this study, a new conception of "ionic liquid assisted capture and conversion of CO2 in PEC system" is proposed and demonstrated by using 1-aminopropyl-3-methylimidazolium bromide aqueous solution as both the absorbent and electrolyte at ambient temperature and pressure...
July 25, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28734252/river-sequesters-atmospheric-carbon-and-limits-the-co2-degassing-in-karst-area-southwest-china
#6
Tao Zhang, Jianhong Li, Junbing Pu, Jonathan B Martin, Mitra B Khadka, Feihong Wu, Li Li, Feng Jiang, Siyu Huang, Daoxian Yuan
CO2 fluxes across water-air interfaces of river systems play important roles in regulating the regional and global carbon cycle. However, great uncertainty remains as to the contribution of these inland water bodies to the global carbon budget. Part of the uncertainty stems from limited understanding of the CO2 fluxes at diurnal and seasonal frequencies caused by aquatic metabolism. Here, we measured surface water characteristics (temperature, pH, and DO, DIC, Ca(2+) concentrations) and CO2 fluxes across the air-water interface at two transects of Guijiang River, southwest China to assess the seasonal and diurnal dynamics of fluvial carbon cycling and its potential role in regional and global carbon budgets...
July 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28732976/preparation-of-waterborne-dispersions-of-epoxy-resin-by-ultrasonic-assisted-supercritical-co2-nanoemulsification-technique
#7
Hanyang Gao, Guoxin Hu, Kun Liu, Liqun Wu
Waterborne nanoemulsion of diglycidyl ether of bisphenol A type epoxy resin (DGEBA) with droplet size of around 124nm was prepared by using an ultrasonic-assisted supercritical carbon dioxide (scCO2) technique in an autoclave reactor at a low temperature (32°C). A view cell positioned in-line with the ultrasonic probe allowed observation of the emulsification process. From the image analysis and droplet size measurement, the influence mechanisms of the ultrasonic power, the degree of mixing of scCO2 with DGEBA, the adding amount of emulsifier, and the system pressure on emulsification process and emulsion droplet size were investigated...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28731572/endoscopic-surgical-technique-for-benign-fibrotic-strictures-of-the-upper-esophageal-sphincter
#8
Shun-Ichi Chitose, Kiminori Sato, Mioko Fukahori, Sachiyo Hamakawa, Akari Koga, Shintaro Sueyoshi, Hirohito Umeno
A 43-year-old man with complaints of increased difficulty of swallowing and weight loss underwent videofluorographic examination of swallowing, which revealed severely reduced cricopharyngeal opening. Endoscopic cricopharyngeal myotomy was performed using a modified technique (mECPM). A benign fibrotic stricture of the upper esophageal sphincter (UES) was identified under visualization of a distending operating laryngoscope. A vertical midline incision in the strictured mucosa and submucosal resection of the cricopharyngeal muscle were performed using a CO2 laser...
July 21, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28715251/body-heat-responsive-gelation-of-methylcellulose-formulation-containing-betaine
#9
Yoshiaki Shirata, Asami Wakasa, Kiyoshi Miura, Hironori Nakamura, Yoshinobu Matsumoto, Tomihiro Miyada
We examined a methylcellulose (MC) formulation that gels at body temperature for enteral alimentation. Betaine was found to have a lowering effect on the gelation temperature of the MC solution. The thermal gelation temperature of a body heat-responsive (BHR) gelling MC formulation, consisting of 2% MC, 15% glucose, 1.2% sodium citrate, and 3.5% betaine mixture, was approximately 32 °C, indicating that it could gel in response to body heat. Glucose release from the BHR gels was delayed at 37 °C in an in vitro study...
September 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28715034/surface-chemistry-and-stability-of-metastable-corundum-type-in2o3
#10
Eva-Maria Köck, Michaela Kogler, Chen Zhuo, Lukas Schlicker, Maged F Bekheet, Andrew Doran, Aleksander Gurlo, Simon Penner
To account for the explanation of an eventual sensing and catalytic behavior of rhombohedral In2O3 (rh-In2O3) and the dependence of the metastability of the latter on gas atmospheres, in situ electrochemical impedance spectroscopic (EIS), Fourier-transform infrared spectroscopic (FT-IR), in situ X-ray diffraction and in situ thermogravimetric analyses in inert (helium) and reactive gases (hydrogen, carbon monoxide and carbon dioxide) have been conducted to link the gas-dependent electrical conductivity features and the surface chemical properties to its metastability towards cubic In2O3...
July 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28714254/microbial-biotechnology-addressing-the-plastic-waste-disaster
#11
Tanja Narancic, Kevin E O'Connor
Oceans are a major source of biodiversity, they provide livelihood, and regulate the global ecosystem by absorbing heat and CO2 . However, they are highly polluted with plastic waste. We are discussing here microbial biotechnology advances with the view to improve the start and the end of life of biodegradable polymers, which could contribute to the sustainable use of marine and coastal ecosystems (UN Sustainability development goal 14).
July 17, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28707806/selective-adsorption-and-separation-of-organic-dyes-with-spherical-polyelectrolyte-brushes-and-compressed-co2
#12
Rui Zhang, Zhenchuan Yu, Yuan Yao, Xiaoyan Hou, Qizhe Shen, Lei Wang, Xuhong Guo, Junwei Wang, Xuedong Zhu
Direct discharge of industry organic dyes has caused serious environmental pollution. Herein, we proposed a rational designed spherical polyelectrolyte brushes (SPB) with cationic charges, polystyrene-poly(2-aminoethylmethacrylate hydrochloride) (PS-PAEMH), as the absorbent and compressed carbon dioxide as the anti-solvent to separate the anionic dye, eosin Y (EY) from a solution of mixed dyes. The adsorption behavior of EY onto PS-PAEMH was highly dependent on CO2 pressure, contact time and initial concentration, and the maximum adsorption capacity of PS-PAEMH was 335...
July 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28688402/temperature-dependence-of-the-photodissociation-of-co2-from-high-vibrational-levels-205-230-nm-imaging-studies-of-co-x-1-%C3%AE-and-o-3-p-1-d-products
#13
S Sutradhar, B R Samanta, A K Samanta, H Reisler
The 205-230 nm photodissociation of vibrationally excited CO2 at temperatures up to 1800 K was studied using Resonance Enhanced Multiphoton Ionization (REMPI) and time-sliced Velocity Map Imaging (VMI). CO2 molecules seeded in He were heated in an SiC tube attached to a pulsed valve and supersonically expanded to create a molecular beam of rotationally cooled but vibrationally hot CO2. Photodissociation was observed from vibrationally excited CO2 with internal energies up to about 20 000 cm(-1), and CO(X(1)Σ(+)), O((3)P), and O((1)D) products were detected by REMPI...
July 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28678479/closing-co2-loop-in-biogas-production-recycling-ammonia-as-fertilizer
#14
Qingyao He, Ge Yu, Te Tu, Shuiping Yan, Yanlin Zhang, Shuaifei Zhao
We propose and demonstrate a novel system for simultaneous ammonia recovery, carbon capture, biogas upgrading, and fertilizer production in biogas production. Biogas slurry pretreatment (adjusting the solution pH, turbidity, and chemical oxygen demand) plays an important role in the system as it significantly affects the performance of ammonia recovery. Vacuum membrane distillation is used to recover ammonia from biogas slurry at various conditions. The ammonia removal efficiency in vacuum membrane distillation is around 75% regardless of the ammonia concentration of the biogas slurry...
July 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28661338/colloidal-chemistry-to-advance-studies-in-artificial-photosynthesis
#15
Raffaella Buonsanti
This article presents an overview of our research in the field of colloidal nanocrystal synthesis and their implementation into water splitting and CO2 reduction electrochemical cells. We discuss our approaches to tailor-made novel material platforms to advance our knowledge in energy storage in chemical bonds, namely artificial photosynthesis. Herein, we focus on complex metal oxides as light absorbers to drive water splitting, nanocrystal hybrids and metals as electrocatalysts for carbon dioxide conversion...
November 30, 2016: Chimia
https://www.readbyqxmd.com/read/28661230/circle-co2-reabsorbing-breathing-systems-human-applications
#16
Patrick Magee
Artificial breathing systems to help humans survive extreme environments are used over a range of ambient pressures, using various gases of different volumetric concentrations. These activities include anaesthesia and intensive care activity, high-altitude mountaineering, firefighting, aerospace extravehicular space activity and underwater diving operations. A circle breathing system is one in which the exhaled carbon dioxide is absorbed by an alkali substance and the remaining unused gases are recirculated, usually for the sake of economy and environment...
July 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28654267/ternary-silver-halide-nanocrystals
#17
Sasitha C Abeyweera, Kowsalya D Rasamani, Yugang Sun
Nanocrystalline silver halides (AgX) such as AgCl, AgBr, and AgI, a class of semiconductor materials with characteristics of both direct and indirect band gaps, represent the most crucial components in traditional photographic processing. The nanocrystal surfaces provide sensitivity specks that can turn into metallic silver, forming an invisible latent image, upon exposure to light. The photographic processing implies that the AgX nanoparticles possess unique properties. First, pristine AgX nanoparticles absorb light only at low efficiency to convert surface AgX into tiny clusters of silver atoms...
June 27, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28640914/kinetic-analysis-of-an-anion-exchange-absorbent-for-co2-capture-from-ambient-air
#18
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
#19
Khurrum Shehzad Quraishi, 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...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28608900/theoretical-and-experimental-studies-on-three-water-stable-isostructural-paddlewheel-based-semiconducting-metal-organic-frameworks
#20
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 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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