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CO2 removal

Ran Wen, Bo Yuan, Yang Wang, Weimin Cao, Yuan Liu, Yi Jia, Qiang Liu
Biochar from Spartina alterniflora (SA) and rice straw (RS) under N2/CO2 were evaluated for Cu(II) removal from aqueous solution. The result indicates SA biochar prepared at 700 °C under CO2 can achieve a Cu(II) sorption capacity of 89.12 ± 2.77 mg/g, which is higher than that from N2 by about 50%. CO2 can promote the development of multi-porous structure, enhance specific surface area, and increase the amounts of hydroxyl and carboxyl groups on biochar. In addition, CO2 can inhibit the thermal decomposition of inorganic carbonate, such as MgCO3 and CaCO3 in biochar...
July 20, 2017: Environmental Science and Pollution Research International
Xiangdan Jin, Yifeng Zhang, Xiaohu Li, Nannan Zhao, Irini Angelidaki
Biogas upgrading to natural gas quality is essential for the efficient use of biogas in various applications. Carbon dioxide (CO2) which constitutes a major part of the biogas is generally removed by physicochemical methods. However, most of the methods are expensive and often present environmental challenges. In this study, an innovative microbial electrolytic system was developed to capture, separate and regenerate CO2 for biogas upgrading without external supply of chemicals, and potentially to treat wastewater...
July 21, 2017: Environmental Science & Technology
Young Nam Chun, Byeo Ri Jeong
Microwave drying-pyrolysis or drying-gasification characteristics was examined to convert sewage sludge into energy and resources. The gasification was carried out with carbon dioxide as a gasifying agent. The examination results were compared with those of the conventional heating-type electric furnace to compare both product characteristics. Through the pyrolysis or gasification, gas, tar and char were generated as products. The produced gas was the largest component of each process followed by the sludge char and the tar...
July 20, 2017: Environmental Technology
Selcan Guler, Bahar Aslan, Pezhman Hosseinian, Halil Murat Aydin
Tissue engineering approaches utilize both natural and synthetic materials in the repair and regeneration processes. A naturally-sourced material for this purpose is required to be free from any antigenic matter such as cells or cellular components. Decellularization of tissues may be achieved via chemical or physical removal agents. Supercritical carbon dioxide (sc-CO2) has been used as a means of removing bioburden from tissues and offers an alternative to the traditionally-used treatment methods. In addition to the many advantages it offers with regard to the successful decellularization of tissues, and known to have a sterilization effect...
July 20, 2017: Tissue Engineering. Part C, Methods
Wenchao Lu, I-Hsien Midas Tsai, Yan Sun, Wenjing Zhou, Jianbo Liu
The reactivity of cystine towards electronically excited singlet O2 (a(1)Δg) has been long debated, despite the fact that most organic disulfides are susceptible to oxidation by singlet O2. We report a combined experimental and computational study on reactions of singlet O2 with gas-phase cystine at different ionization and hydration states, aimed to determine reaction outcomes, mechanisms and potential energy surfaces. Ion-molecule collisions of protonated and di-deprotonated cystine ions with (1)O2, in both the absence and the presence of a water ligand, were measured over a center-of-mass collision energy (Ecol) range from 0...
July 20, 2017: Journal of Physical Chemistry. B
Milad Ferdowsi, Antonio Avalos Ramirez, Joseph Peter Jones, Michèle Heitz
Methane (CH4) removal in the presence of ethanol vapors was performed by a stone-based bed and a hybrid packing biofilter in parallel. In the absence of ethanol, a methane removal efficiency of 55 ± 1% was obtained for both biofilters under similar CH4 inlet load (IL) of 13 ± 0.5 gCH4 m(-3) h(-1) and an empty bed residence time (EBRT) of 6 min. The results proved the key role of the bottom section in both biofilters for simultaneous removal of CH4 and ethanol. Ethanol vapor was completely eliminated in the bottom sections for an ethanol IL variation between 1 and 11 gethanol m(-3) h(-1)...
July 18, 2017: Environmental Science and Pollution Research International
Mohammad F Azizian, Lewis Semprini
The simultaneous anaerobic transformation of tetrachloroethene (PCE) and carbon tetrachloride (CT) was evaluated in a continuous flow column. The column was packed with quartz sand and bioaugmented with the Evanite culture (EV) that is capable of transforming PCE to ethene. Azizian and Semprini (2016) reported that PCE and CT could be simultaneously transformed in the column, with PCE (0.1mM) transformed mainly to ethene and CT (0.015mM) to chloroform (CF) (20%) and an unknown transformation product, likely carbon dioxide (CO2)...
July 6, 2017: Journal of Contaminant Hydrology
Solfrid Hegstad, Hilde Havnen, Arne Helland, Berit Margrethe Hasle Falch, Olav Spigset
A method for enantiomeric separation and quantification of R/S-citalopram in serum was developed and validated using ultra-high performance supercritical fluid chromatography-tandem mass spectrometry (UHPSFC-MS/MS). Sample preparation prior to UHPSFC-MS/MS analysis consisted of protein precipitation with acidic acetonitrile and filtration through a phospholipid removal plate. The UHPSFC-MS/MS method used an UPC(2) Trefoil CEL2 column with a mobile phase consisting of CO2 and methanol/acetonitrile (70:30, v/v) with 10mM ammonium acetate...
July 9, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Kwangsuk Yoon, Dong-Wan Cho, Daniel C W Tsang, Nanthi Bolan, Jörg Rinklebe, Hocheol Song
An engineered biochar was fabricated via paper mill sludge pyrolysis under CO2 atmosphere, and its adsorption capability for As(V) and Cd(II) in aqueous solution was evaluated in a batch mode. The characterization results revealed that the biochar had the structure of complex aggregates containing solid minerals (FeO, Fe3O4 and CaCO3) and graphitic carbon. Adsorption studies were carried out covering various parameters including pH effect, contact time, initial concentrations, competitive ions, and desorption...
July 6, 2017: Bioresource Technology
Xue Wang, Keting Bao, Weixing Cao, Yongjun Zhao, Chang Wei Hu
The microalgae-based technology has been developed to reduce biogas slurry nutrients and upgrade biogas simultaneously. In this work, five microalgal strains named Chlorella vulgaris, Scenedesmus obliquus, Selenastrum capricornutum, Nitzschia palea, and Anabaena spiroides under mono- and co-cultivation were used for biogas upgrading. Optimum biogas slurry nutrient reduction could be achieved by co-cultivating microalgae (Chlorella vulgaris, Scenedesmus obliquus, and Nitzschia palea) with fungi using the pelletization technology...
July 14, 2017: Scientific Reports
Jian Shen, Xin-Ze Wang, Zhen Zhang, Yan-Ming Sui, Hai-Lu Wu, Ji-Meng Feng, Xin-Nan Tong, Zhen-Yu Zhang
Bisphenol A (BPA) has caused widespread concern among scholars as a result of its estrogenic toxicity. It exists mainly in natural waters, sediments, and soil, as well as sewage and wastewater sludge. Considering that BPA is a common environmental pollutant that is removed along with chemical oxygen demand (COD), nitrogen, and phosphorus in drainage treatment systems, it is important to research the fate of BPA in sewage treatment systems. In this research, laboratory batch experiments on soil degradation and adsorption were conducted with (14)C-BPA, aiming to discuss the transport and degradation characteristics of BPA in both simulated facilities and a soil trench...
July 11, 2017: Science of the Total Environment
F Seiler, F C Trudzinski, M Kredel, C Lotz, P M Lepper, R M Muellenbach
BACKGROUND: Hypercapnic respiratory failure is a frequent problem in critical care and mainly affects patients with acute exacerbation of COPD (AECOPD) and acute respiratory distress syndrome (ARDS). In recent years, the usage of extracorporeal CO2 removal (ECCO2R) has been increasing. OBJECTIVE: Summarizing the state of the art in the management of hypercapnic respiratory failure with special regard to the role of ECCO2R. METHODS: Review based on a selective literature search and the clinical and scientific experience of the authors...
July 13, 2017: Medizinische Klinik, Intensivmedizin und Notfallmedizin
Giacomo Grasselli, Antonio Pesenti
No abstract text is available yet for this article.
July 2017: Minerva Anestesiologica
Aziz Sadeghizadeh, Farid Farhad Dad, Leila Moghaddasi, Rahbar Rahimi
In this work, hydrodynamics and CO2 biofixation study was conducted in an airlift bioreactor at the temperature of 30±2°C. The main objective of this work was to investigate the effect of high gas superficial velocity on CO2 biofixation using Chlorella vulgaris microalgae and its growth. The study showed that Chlorella vulgaris in high input gas superficial velocity also had the ability to grow and remove the CO2 by less than 80% efficiency.
June 29, 2017: Bioresource Technology
Manuri Brahmayya, Shenghong A Dai, Shing-Yi Suen
Acid catalysts facilitate many chemical reactions. Sulfonated reduced grapheneoxide (rGOPhSO3H) has shown to be an encouraging solid acid catalyst because of its efficiency, cost-effectiveness and safety of use. In this study, we prepared the rGOPhSO3H nano acid catalyst, with the introduction of aromatic sulfonic acid radicals onto GO by fractional removal of oxygenated functions. It was thoroughly characterized by FT-IR, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, energy dispersive spectroscopy (EDS) and solid state (13)C MAS NMR (SSNMR)...
July 5, 2017: Scientific Reports
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
Rebecca L Siegelman, Thomas M McDonald, Miguel I Gonzalez, Jeffrey Martell, Phillip J Milner, Jarad A Mason, Adam H Berger, Abhoyjit S Bhown, Jeffrey R Long
In the transition to a clean-energy future, CO2 separations will play a critical role in mitigating current greenhouse gas emissions and facilitating conversion to cleaner-burning and renewable fuels. New materials with high selectivities for CO2 adsorption, large CO2 removal capacities, and low regeneration energies are needed to achieve these separations efficiently at scale. Here, we present a detailed investigation of nine diamine-appended variants of the metal-organic framework Mg2(dobpdc) (dobpdc(4-) = 4,4'-dioxidobiphenyl-3,3'-dicarboxylate) that feature step-shaped CO2 adsorption isotherms resulting from cooperative and reversible insertion of CO2 into metal-amine bonds to form ammonium carbamate chains...
July 2, 2017: Journal of the American Chemical Society
Lin Tang, Weijun Luo, Weikang Chen, Zhenli He, Hanumanth Kumar Gurajala, Yasir Hamid, Meihua Deng, Xiaoe Yang
Phytoremediation coupled with crop rotation (PCC) is a feasible strategy for remediation of contaminated soil without interrupting crop production. The objective of this study was to develop a PCC technology system for greenhouse fields co-contaminated with Cd and nitrate using hyperaccumulator Sedum alfredii. In this system, endophytic bacterium M002 inoculation, CO2 fertilization, and fermentation residue were continuously applied to improve the growth of S. alfredii, and low-accumulator Ipomoea aquatica and low-accumulator Brassica chinensis were rotated under reasonable water management...
July 1, 2017: Environmental Science and Pollution Research International
A Feinerman, J Weddell
This report establishes an experimental method of studying electrically percolating networks at a higher resolution than previously implemented. This method measures the current across a conductive sheet as a function of time as elliptical pores are cut into the sheet. This is done utilizing a Universal Laser System X2-600 100 W CO2 laser system with a 76 × 46 cm(2) field and 394 dpc (dots/cm) resolution. This laser can cut a random system of elliptical pores into a conductive sheet with a potential voltage applied across it and measures the current versus time...
June 2017: Review of Scientific Instruments
Mingguo Peng, Huajie Li, Xu Kang, Erdeng Du, Dongdong Li
The removal of ibuprofen (IBP) in aqueous solution using UV/H2O2 process was evaluated. The response surface methodology (RSM) and Box-Behnken design were employed to investigate the effects of process parameters on IBP removal, including the initial IBP concentration, H2O2 dosage, UV light intensity, and initial pH value of solution. The RSM model developed herein fits well with the experiments, and provides a good insight into the OH radical irritated degradation mechanisms and kinetics. High resolution accurate mass spectrometry coupled with liquid chromatography was used to identify the degradation intermediates...
June 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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