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CO2 removal

Yuheng Luo, Hong Chen, Bing Yu, Jun He, Ping Zheng, Xiangbing Mao, Gang Tian, Jie Yu, Zhiqing Huang, Junqiu Luo, Daiwen Chen
BACKGROUND: Pea fiber (PF) is a potential fibrous supplement in swine production. The influence of dietary PF on microbial community in the colon of pigs remains largely unexplored. Methanogens in the hindgut of monogastric animals play important roles in degradation of dietary fibers and efficient removal of microbial metabolic end product H2. Understanding the impact of dietary PF on the structure of colonic methanogens may help understand the mechanisms of microbe-mediated physiological functions of PF...
January 17, 2017: BMC Microbiology
Joel L Cohen, Roy Geronemus
BACKGROUND & OBJECTIVE: Surgical scars are an unwanted sequela following surgical procedures. Several different treatment modalities and approaches are currently being employed to improve the cosmesis of surgical scars with each having varying degrees of success. The objective of this study was to assess the ef cacy and safety pulsed dye laser treatment, CO2 ablative fractional resurfacing, and a combined treatment with these two modalities for the cosmetic improvement of surgical scarring that occurred following the surgical removal of skin cancer from different anatomic areas...
November 1, 2016: Journal of Drugs in Dermatology: JDD
Ebrahim Tilahun, Alper Bayrakdar, Erkan Sahinkaya, Bariş Çalli
H2S in biogas affects the co-generation performance adversely by corroding some critical components within the engine and it has to be removed in order to improve the biogas quality. This work presents the use of polydimethylsiloxane (PDMS) membrane contactor for selective removal of H2S from the biogas. Experiments were carried out to evaluate the effects of different pH of absorption liquid, biogas flowrate and temperature on the absorption performances. The results revealed that at the lowest loading rate (91mg H2S/m(2)·h) more than 98% H2S and 59% CO2 absorption efficiencies were achieved...
January 13, 2017: Waste Management
Dong-Zhi Chen, Ning-Xin Jiang, Jie-Xu Ye, Zhuo-Wei Cheng, Shi-Han Zhang, Jian-Meng Chen
Bioremediation usually exhibits low removal efficiency toward hexane because of poor water solubility, which limits the mass transfer rate between the substrate and microorganism. This work aimed to enhance the hexane degradation rate by increasing cell surface hydrophobicity (CSH) of the degrader, Pseudomonas mendocina NX-1. The CSH of P. mendocina NX-1 was manipulated by treatment with starch and chitosan solution of varied concentrations, reaching a maximum hydrophobicity of 52%. The biodegradation of hexane conformed to the Haldane inhibition model, and the maximum degradation rate (ν max) of the cells with 52% CSH was 0...
January 14, 2017: Applied Microbiology and Biotechnology
Yuan Zhang, Ping Li, Lan-Qin Tang, Yong-Qiang Li, Yong Zhou, Jun-Ming Liu, Zhi-Gang Zou
Robust, double-shelled ZnGa2O4 hollow spheres were successfully fabricated by hydrothermally treating an aqueous solution containing Zn(ii), Ga(iii), and citric acid, followed by annealing at 600 °C, 700 °C, or 800 °C in air to remove the carbon species. The hollow structure is expected to trap incident photons to enhance the light absorbance. The sample annealed at 700 °C exhibited the optimized photocatalytic performance in the reduction of CO2 in the presence of water vapor to methane. This property is ascribed to the improved crystallinity of the sample, which has fewer defect centers for the recombination of electron-hole pairs compared with that annealed at 600 °C...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Jacob Schneidewind, Rosa Adam, Wolfgang Baumann, Ralf Jackstell, Matthias Beller
Herein we describe the first homogeneous non-noble metal catalyst for the hydrogenation of CO2 to methanol. The catalyst is formed in situ from [Co(acac)3 ], Triphos, and HNTf2 and enables the reaction to be performed at 100 °C without a decrease in activity. Kinetic studies suggest an inner-sphere mechanism, and in situ NMR and MS experiments reveal the formation of the active catalyst through slow removal of the acetylacetonate ligands.
January 12, 2017: Angewandte Chemie
Shreyas Harita, Patrick W Stroman
PURPOSE: Resting-state functional MRI (rs-fMRI) has been used to investigate networks within the cortex, but its use in the brainstem (BS) and spinal cord (SC) has been limited. This region presents challenges for fMRI, partly because of sources of physiological noise. This study aims to quantify noise contributions to rs-fMRI, and to obtain evidence of resting-state blood oxygenation level-dependent (BOLD) fluctuations. METHODS: Resting-state-fMRI data were obtained from the BS/SC in 16 participants, at 3 Tesla, with T2 -weighted single-shot fast spin-echo imaging...
January 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Sung Min Kim, Paula Macarena Abdala, Tigran Margossian, Davood Hosseini, Lucas Foppa, Andac Armutlulu, Wouter van Beek, Aleix Comas-Vives, Christophe Copéret, Christoph Mueller
The dry reforming of methane (DRM), i.e. the reaction of methane and CO2 to form a synthesis gas, converts two major greenhouse gases into a useful chemical feedstock. In this work, we probe in detail the effect and role of Fe in bimetallic NiFe dry reforming catalysts. To this end, monometallic Ni, Fe and bimetallic Ni-Fe catalysts supported on a MgxAlyOz-matrix derived via a hydrotalcite-like precursor were synthetized. Importantly, the textural features of the catalysts, i.e. the specific surface area (172-178 m2/gcat), pore volume (0...
January 9, 2017: Journal of the American Chemical Society
Zesheng Xu, Han Liu, Junfeng Niu, Yijing Zhou, Chong Wang, Yue Wang
We prepared a hydroxyl multi-wall carbon nanotube-modified nanocrystalline PbO2 anode (MWCNTs-OH-PbO2) featuring high oxygen evolution potential, large effective area, and excellent electrocatalytic performance. The oxygen evolution potential and effective area of the MWCNTs-OH-PbO2 electrode were 1.5 and 3.7-fold higher than the traditional PbO2 electrode. Electrochemical degradation of pyridine in aqueous solution was investigated by using the MWCNTs-OH-PbO2 anode. Based on pyridine decay rate (93.8%), total organic carbon reduction (84...
December 29, 2016: Journal of Hazardous Materials
Jiezhen Liang, Xiaopeng Chen, Linlin Wang, Xiaojie Wei, Huasheng Wang, Songzhou Lu, Yunhua Li
The aim of present study was to obtain total reducing sugars (TRS) by hydrolysis in subcritical CO2-water from sugarcane bagasse pith (SCBP), the fibrous residue remaining after papermaking from sugarcane bagasse. The optimum hydrolysis conditions were evaluated by L16(4(5)) orthogonal experiments. The TRS yield achieved 45.8% at the optimal conditions: 200°C, 40min, 500rmin(-1), CO2 initial pressure of 1MPa and liquid-to-solid ratio of 50:1. Fourier transform infrared spectrometry and two-dimensional heteronuclear single quantum coherence nuclear magnetic resonance were used to characterize hydrolysis liquor, treated and untreated SCBP, resulting in the removal of hemicelluloses to mainly produce xylose, glucose and arabinose during hydrolysis...
December 24, 2016: Bioresource Technology
Martin Schieder, Carina Bojer, Julia Vom Stein, Sebastian Koch, Thomas Martin, Holger Schmalz, Josef Breu, Thomas Lunkenbein
Oxidative thermal removal of the polymeric templates is not trivial for molybdenum oxides and hampers mesostructuring of this material. At ambient oxygen fugacity, Mo(VI) is the thermodynamically stable oxidation state and sublimation of MoO3 leads to a quick loss of the mesostructure through Oswald ripening. Taking advantage of the Boudouard equilibrium allows to fix the oxygen fugacity at a level where non-volatile MoO2-x is stable while carbonaceous material may be oxidized by CO2 . Mesostructured MoO2-x can be chemically converted into MoO3 or MoN under retention of the mesostructure...
January 3, 2017: Angewandte Chemie
Elvia Annabella Chavez Panduro, Karine Assaker, Thomas Beuvier, Jean-Luc Blin, Marie Jose Stebe, Oleg V Konovalov, Alain Gibaud
Surfactant templated silica thin films were self-assembled on solid substrates by dip-coating using a partially fluorinated surfactant RF8(EO)9 as the liquid crystal template. The aim was twofold: first we checked which composition in the phase diagram was corresponding to a 2D rectangular highly ordered crystalline phase and second we exposed the films to sc-CO2 to foster the removal of the surfactant. The films were characterized by in-situ X-Ray Reflectivity (XRR) and Grazing Incidence Small Angle X-ray Scattering (GISAXS) under CO2 pressure from 0 to 100 bars at 34°C...
December 28, 2016: ACS Applied Materials & Interfaces
Tomohiro Tabata, Yohei Wakabayashi, Peii Tsai, Takashi Saeki
Although it is important that disaster waste be demolished and removed as soon as possible after a natural disaster, it is also important that its treatment is environmentally friendly and economic. Local municipalities do not conduct environmental and economic feasibility studies of pre-disaster waste management; nevertheless, pre-disaster waste management is extremely important to promote treatment of waste after natural disasters. One of the reasons that they cannot conduct such evaluations is that the methods and inventory data required for the environmental and economic evaluation does not exist...
December 24, 2016: Waste Management
Xiuzhan Xue, Cunming Yu, Jingming Wang, Lei Jiang
Microbubbles are tiny bubbles with diameters below 50 μm. Because of their minute buoyant force, the microbubbles stagnate in aqueous media for a long time, and they sometimes cause serious damage. Most traditional methods chosen for elimination of gas bubbles utilize buoyancy forces including chemical methods and physical methods, and they only have a minor effect on microbubbles. Several approaches have been developed to collect and transport microbubbles in aqueous media. However, the realization of innovative strategies to directly collect and transport microbubbles in aqueous media remains a big challenge...
December 27, 2016: ACS Nano
Hai Hu, Kai Zhang, Gang Zhao, Zhaoyan Jiang, Anhua Huang, Jingli Cai, Anan Xu, Haidong Li, Chuanqi He, Kan Ding, Ruiqi Lu, Ruiqi Ye
INTRODUCTION: Traditional laparaendoscopic surgery using CO2 pneumoperitoneum is associated with complications and the existing gasless laparaendoscopic surgery has shortcomings such as poor visibility in the operation field. To overcome the disadvantages of the current lifting gasless laparaendoscopic operation platforms, we developed an inflatable device for gasless laparoscopic operation field formation (LOFF) that can be internally installed and applied in practice. METHODS: We initially designed operation platforms for gasless laparaendoscopic single-port (GLESP) surgery...
January 2017: Annals of Medicine and Surgery
Yingjie Yan, Qi-Nan Liao, Feng Ji, Wei Wang, Shoujun Yuan, Zhen-Hu Hu
3,5-Dinitrobenzamide has been widely used as a feed additive to control coccidiosis in poultry, and part of the added 3,5-dinitrobenzamide is excreted into wastewater and surface water. The removal of 3,5-dinitrobenzamide from wastewater and surface water has not been reported in previous studies. Highly reactive hydroxyl radicals from UV/hydrogen peroxide (H2O2) and UV/titanium dioxide (TiO2) advanced oxidation processes (AOPs) can decompose organic contaminants efficiently. In this study, the decomposition of 3,5-dinitrobenzamide in aqueous solution during UV/H2O2 and UV/TiO2 oxidation processes was investigated...
December 24, 2016: Environmental Science and Pollution Research International
Bao-Nan He, Jiang-Tao He, Jian Wang, Jie Li, Fei Wang
The pH is a primary index reflecting water quality in rivers. The Jian River and Chaobai River are two reclaimed water intake areas which have elevated pH. This elevated pH has a marked effect on both the phytoplankton, species in water and vegetation on the shore. Understanding the main reasons causing pH elevation in river water has important implications for river ecosystem management and the improvement of water quality and can provide a theoretical basis for the direction of water quality improvement. For this reason, each biogeochemical and physical process influencing pH changes in water was quantified along the flow direction in the Wenyu to Chaobai reclaimed water diversion project, in which proton consumption and production by such processes were monitored and calculated at five monitoring sections...
December 23, 2016: Environmental Science. Processes & Impacts
Charles A Seipp, Neil J Williams, Michelle K Kidder, Radu Custelcean
Carbon capture and storage is an important strategy for stabilizing the increasing concentration of atmospheric CO2 and the global temperature. A possible approach toward reversing this trend and decreasing the atmospheric CO2 concentration is to remove the CO2 directly from air (direct air capture). Herein we report a simple aqueous guanidine sorbent that captures CO2 from ambient air and binds it as a crystalline carbonate salt by guanidinium hydrogen bonding. The resulting solid has very low aqueous solubility (Ksp =1...
December 21, 2016: Angewandte Chemie
Betzabet Morero, Rocio Vicentin, Enrique A Campanella
In Argentina, there is an important potential to utilize organic waste to generate bioenergy. This work analyzes the environmental impacts and the energetic and economic requirements of the biogas produced by digesting the sewage sludge (SS) produced in a wastewater treatment plant in a medium city in Argentina. The SS is co-digested with the organic fraction of municipal solid waste (OFMSW), and the basis of this study is the life cycle assessment (LCA). The LCA is performed according to ISO 14040-44 using the SimaPro simulator...
December 7, 2016: Waste Management
Shoko Matsushita, Noritaka Masaki, Kohei Sato, Takahiro Hayasaka, Eiji Sugiyama, Shu-Ping Hui, Hitoshi Chiba, Nobuyuki Mase, Mitsutoshi Setou
There is a high analytical demand for improving the detection sensitivity for various peptides in matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI-IMS) because exhaustive distribution analyses of various peptides could help to reveal the function of peptides in vivo. To improve the sensitivity of peptide detection, we used supercritical fluid of CO2 (scCO2) as washing solvent for a pretreatment to remove lipids. We evaluated whether our wash method using scCO2 with an entrainer improved the detection of peptides and suppressed lipid detection in MALDI-IMS...
December 9, 2016: Analytical and Bioanalytical Chemistry
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