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https://www.readbyqxmd.com/read/28481540/fabrication-of-photoreactive-biocomposite-coatings-via-electric-field-assisted-assembly-of-cyanobacteria
#1
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
#2
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
#3
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
#4
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...
May 11, 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
#5
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
#6
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
#7
Yapei Wang, Dingguan Wang, Shenglong Liao, Shiming Zhang
Materials for CO2 capture have been extensively exploited for climate governance and gaseous separation. However, their regeneration is facing the problems of high energy cost and secondary CO2 contamination. Herein, a reversed photosynthesis-like process is proposed, which absorbs CO2 in darkness while releases CO2 under light illumination. The process is likely supplementary to natural photosynthesis of plants which on the contrary release CO2 in nights. Remarkably, the material used in this work 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
#8
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
#9
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...
April 11, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/28332485/tuning-ferritin-s-band-gap-through-mixed-metal-oxide-nanoparticle-formation
#10
Cameron R Olsen, Jacob S Embley, Kameron R Hansen, Andrew M Henrichsen, J Ryan Peterson, John S Colton, Richard K Watt
This study uses the formation of a mixed metal oxide inside ferritin to tune the band gap energy of the ferritin mineral. The mixed metal oxide is composed of both Co and Mn, and is formed by reacting aqueous Co(2+) with [Formula: see text] in the presence of apoferritin. Altering the ratio between the two reactants allowed for controlled tuning of the band gap energies. All minerals formed were indirect band gap materials, with indirect band gap energies ranging from 0.52 to 1.30 eV. The direct transitions were also measured, with energy values ranging from 2...
May 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28318033/changes-in-the-chloroplastic-co2-concentration-explain-much-of-the-observed-kok-effect-a-model
#11
Graham D Farquhar, Florian A Busch
Mitochondrial respiration often appears to be inhibited in the light when compared with measurements in the dark. This inhibition is inferred from the response of the net CO2 assimilation rate (A) to absorbed irradiance (I), changing slope around the light compensation point (Ic ). We suggest a model that provides a plausible mechanistic explanation of this 'Kok effect'. The model uses the mathematical description of photosynthesis developed by Farquhar, von Caemmerer and Berry; it involves no inhibition of respiration rate in the light...
April 2017: New Phytologist
https://www.readbyqxmd.com/read/28306250/co2-selective-absorbents-in-air-reverse-lipid-bilayer-structure-forming-neutral-carbamic-acid-in-water-without-hydration
#12
Fuyuhiko Inagaki, Chiaki Matsumoto, Takashi Iwata, Chisato Mukai
Emission gas and air contain not only CO2 but also plentiful moisture, making it difficult to achieve selective CO2 absorption without hydration. To generate absorbed CO2 (wet CO2) under heating, the need for external energy to release the absorbed water has been among the most serious problems in the fields of carbon dioxide capture and storage (CCS) and direct air capture (DAC). We found that the introduction of the hydrophobic phenyl group into alkylamines of CO2 absorbents improved the absorption selectivity between CO2 and water...
March 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28293810/importance-of-the-green-color-absorption-gradient-and-spectral-absorption-of-chloroplasts-for-the-radiative-energy-balance-of-leaves
#13
Atsushi Kume
Terrestrial green plants absorb photosynthetically active radiation (PAR; 400-700 nm) but do not absorb photons evenly across the PAR waveband. The spectral absorbance of photosystems and chloroplasts is lowest for green light, which occurs within the highest irradiance waveband of direct solar radiation. We demonstrate a close relationship between this phenomenon and the safe and efficient utilization of direct solar radiation in simple biophysiological models. The effects of spectral absorptance on the photon and irradiance absorption processes are evaluated using the spectra of direct and diffuse solar radiation...
March 14, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28293107/nh4hco3-gas-generating-liposomal-nanoparticle-for-photoacoustic-imaging-in-breast-cancer
#14
Jizhu Xia, Gang Feng, Xiaorong Xia, Lan Hao, Zhigang Wang
In this study, we have developed a biodegradable nanomaterial for photoacoustic imaging (PAI). Its biodegradation products can be fully eliminated from a living organism. It is a gas-generating nanoparticle of liposome-encapsulating ammonium bicarbonate (NH4HCO3) solution, which is safe, effective, inexpensive, and free of side effects. When lasers irradiate these nanoparticles, NH4HCO3 decomposes to produce CO2, which can absorb much of the light energy under laser irradiation with a specific wavelength, and then expand under heat to generate a thermal acoustic wave...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28287153/a-significant-net-sink-for-co2-in-tokyo-bay
#15
Atsushi Kubo, Yosaku Maeda, Jota Kanda
Most estuaries and inland waters are significant source for atmospheric CO2 because of input of terrestrial inorganic carbon and mineralization of terrestrially supplied organic carbon. In contrast to most coastal waters, some estuaries with small freshwater discharge are weak source or sometimes sink for CO2. Extensive surveys of pCO2 in Tokyo Bay showed that the overall bay acts as a strong net sink for atmospheric CO2. Although small area was a consistent source for CO2, active photosynthesis driven by nutrient loading from the land overwhelmed the CO2 budget in the bay...
March 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28272872/low-energy-co2-release-from-metal-organic-frameworks-triggered-by-external-stimuli
#16
Haiqing Li, Matthew R Hill
Groundbreaking research over the past 15 years has established metal-organic frameworks (MOFs) as adsorbents capable of unprecedented gas adsorption capacity. This has encouraged the contemplation of their use in applications such as increasing the storage capacity in natural gas fuel tanks, or the capture of carbon dioxide from coal-fired flue gas streams. However, while the gas adsorption capacity of MOFs is large, not all stored gas can be readily released to realize the efficient regeneration of MOF adsorbents...
March 8, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28271885/well-defined-nanographene-rhenium-complex-as-an-efficient-electrocatalyst-and-photocatalyst-for-selective-co2-reduction
#17
Xiaoxiao Qiao, Qiqi Li, Richard N Schaugaard, Benjamin W Noffke, Yijun Liu, Dongping Li, Lu Liu, Krishnan Raghavachari, Liang-Shi Li
Improving energy efficiency of electrocatalytic and photocatalytic CO2 conversion to useful chemicals poses a significant scientific challenge. We report on using a colloidal nanographene to form a molecular complex with a metal ion to tackle this challenge. In this work, a well-defined nanographene-Re complex was synthesized, in which electron delocalization over the nanographene and the metal ion significantly decreases the electrical potential needed to drive the chemical reduction. We show the complex can selectively electrocatalyze CO2 reduction to CO in tetrahydrofuran at -0...
March 8, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28258991/fast-pyrolysis-of-cotton-stalk-biomass-using-calcium-oxide
#18
Xu Chen, Yingquan Chen, Haiping Yang, Wei Chen, Xianhua Wang, Hanping Chen
We herein investigate the various roles of calcium oxide in the pyrolysis of biomass at a variant temperatures. The evolution of pyrolysis products was examined to propose the various roles of Ca at a range of temperatures and CaO addition ratios with cotton stalk on a fixed-bed reactor. We found that upon the addition of CaO, the content of ketones produced increased, while that of acidic compounds decreased. Under similar conditions, the concentration of evolved H2 and CH4 increased, while that of CO2 decreased...
February 20, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28257469/photosynthetic-recovery-and-acclimation-to-excess-light-intensity-in-the-rehydrated-lichen-soil-crusts
#19
Li Wu, Yaping Lei, Shubin Lan, Chunxiang Hu
As an important successional stage and main type of biological soil crusts (BSCs) in Shapotou region of China (southeastern edge of Tengger Desert), lichen soil crusts (LSCs) often suffer from many stresses, such as desiccation and excess light intensity. In this study, the chlorophyll fluorescence and CO2 exchange in the rehydrated LSCs were detected under a series of photosynthetically active radiation (PAR) gradients to study the photosynthetic acclimation of LSCs. The results showed that although desiccation leaded to the loss of photosynthetic activity in LSCs, the fluorescence parameters including Fo, Fv and Fv/Fm of LSCs could be well recovered after rehydration...
2017: PloS One
https://www.readbyqxmd.com/read/28242524/combustion-absorption-process-for-the-separation-of-14-c-and-3-h-in-radwastes-released-from-nuclear-power-plants-and-their-analysis
#20
Young Gun Ko, Chang-Jong Kim, Young Hyun Cho, Kun Ho Chung, Mun Ja Kang
Radioactivities of (3)H and (14)C in spent radioactive ion exchange resins and spent radioactive lubricant oils released from nuclear power plants, has been determined using a combustion and sorption method (combustion method). The liquid scintillation counting (LSC) spectra showed that the interference of other radionuclides has not significantly affected the determination of radioactivities of (3)H and (14)C in the radwaste samples. The chemical structure of (14)CO2, which originated from the combustion of radwastes, trapped (14)C sorbent has been investigated using Fourier transform infrared spectroscopy (FT-IR)...
February 16, 2017: Journal of Hazardous Materials
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