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CO2 removal

Jun Cheng, Qing Ye, Ke Li, Jianzhong Liu, Junhu Zhou
Removal of endocrine-disrupting chemical ethinylestradiol (EE2) from wastewater by microalgal mutant Chlorella PY-ZU1 under 15% CO2 were investigated. Moreover, the effects of EE2 on microscopic structure and antioxidation ability of microalgal cells were determined. EE2 concentrations in range of 0.01-5 mg L(-1) stimulated microalgal growth. Increasing the original EE2 concentration from 0 to 5 mg L(-1) increased the cell fractal dimension from 1.38 to 1.59 and reduced the cell size from 5.18 to 3...
October 10, 2017: Bioresource Technology
A T Harris, A Tanyi, R D Hart, J Trites, M H Rigby, J Lancaster, A Nicolaides, S M Taylor
Transoral laser microsurgery applies to the piecemeal removal of malignant tumours of the upper aerodigestive tract using the CO2 laser under the operating microscope. This method of surgery is being increasingly popularised as a single modality treatment of choice in early laryngeal cancers (T1 and T2) and occasionally in the more advanced forms of the disease (T3 and T4), predominantly within the supraglottis. Thomas Kuhn, the American physicist turned philosopher and historian of science, coined the phrase 'paradigm shift' in his groundbreaking book The Structure of Scientific Revolutions...
October 19, 2017: Annals of the Royal College of Surgeons of England
Vanessa Hörmann, Klaus-Reinhard Brenske, Christian Ulrichs
Three common plant species (Dieffenbachia maculata, Spathiphyllum wallisii, and Asparagus densiflorus) were tested against their capacity to remove the air pollutants toluene (20.0 mg m(-3)) and 2-ethylhexanol (14.6 mg m(-3)) under light or under dark in chamber experiments of 48-h duration. Results revealed only limited pollutant filtration capabilities and indicate that aerial plant parts of the tested species are only of limited value for indoor air quality improvement. The removal rate constant ranged for toluene from 3...
October 18, 2017: Environmental Science and Pollution Research International
Bin Quan, Xiaohui Liang, Guangbin Ji, Yanan Zhang, Guoyue Xu, Youwei Du
The magnet/dielectric composites with tunable structure and composition have drawn much attention because of their particular merits in magnetoelectric properties compared with the sole dielectric or magnetic composites. In addition, porous materials at the nanoscale can satisfy the growing requirements in many industries. Therefore, constructing porous metal alloy/carbon nanocomposites is to be an admirable option. Unfortunately, traditional synthesis methods involve multi-step routes and complicated insert-and-remove templates approaches...
October 16, 2017: ACS Applied Materials & Interfaces
Haiming Wu, Jinlin Fan, Jian Zhang, Huu Hao Ngo, Wenshan Guo
Multi-stage constructed wetlands (CWs) have been proved to be a cost-effective alternative in the treatment of various wastewaters for improving the treatment performance as compared with the conventional single-stage CWs. However, few long-term full-scale multi-stage CWs have been performed and evaluated for polishing effluents from domestic wastewater treatment plants (WWTP). This study investigated the seasonal and spatial dynamics of carbon and the effects of the key factors (input loading and temperature) in the large-scale seven-stage Wu River CW polishing domestic WWTP effluents in northern China...
October 10, 2017: Environmental Pollution
Jennifer M Cori, Peter D Rochford, Fergal J O'Donoghue, John Trinder, Amy S Jordan
Objectives: Ventilatory after-discharge (sustained elevation of ventilation following stimulus removal), occurs during sleep but not when hypocapnia is present. Genioglossus after-discharge also occurs during sleep, but CO2 effects have not been assessed. The relevance is that post-arousal after-discharge may protect against upper airway collapse. This study aimed to determine whether arousal elicits genioglossus after-discharge that persists into sleep, and whether it is influenced by CO2...
October 6, 2017: Sleep
Limin Yue, Qiongzhang Xia, Liwei Wang, Linlin Wang, Herbert DaCosta, Jie Yang, Xin Hu
This article reports on the synthesis and characterization of porous nitrogen-doped carbons synthesized by carbonization of coconut shell followed by urea modification and K2CO3 activation. The as-synthesized samples were carefully characterized by various techniques. This series of samples demonstrate high CO2 uptake at 1bar, up to 3.71mmol/g at 25°C in addition to 5.12mmol/g at 0°C. Furthermore, these sorbents possess fast CO2 adsorption kinetics, stable reusability, moderate heat of CO2 adsorption, reasonable CO2/N2 selectivity, and high dynamic CO2 capture capacity under simulated flue gas conditions...
September 8, 2017: Journal of Colloid and Interface Science
Yangxian Liu, Yan Wang, Qian Wang, Jianfeng Pan, Jun Zhang
Simultaneous removal process of SO2 and NO from flue gas using vacuum ultraviolet light (VUV)/heat/peroxymonosulfate (PMS) in a VUV spraying reactor was proposed. The key influencing factors, active species, reaction products and mechanism of SO2 and NO simultaneous removal were investigated. The results show that vacuum ultraviolet light (185 nm) achieves the highest NO removal efficiency and yield of and under the same test conditions. NO removal is enhanced at higher PMS concentration, light intensity and oxygen concentration, and is inhibited at higher NO concentration, SO2 concentration and solution pH...
October 3, 2017: Chemosphere
Arthur Pavot, Jihad Mallat, Nicolas Vangrunderbeeck, Didier Thevenin, Malcolm Lemyze
RATIONALE: Mechanical ventilation of severe acute asthma is still considered a challenging issue, mainly because of the gas trapping phenomenon with the potential for life-threatening barotraumatic pulmonary complications. PATIENT CONCERNS: Herein, we describe 2 consecutive cases of near-fatal asthma for whom the recommended protective mechanical ventilation approach using low tidal volume of 6 mL/kg and small levels of PEEP was rapidly compromised by giant pneumomediastinum with extensive subcutaneousemphysema...
October 2017: Medicine (Baltimore)
M Fernández-Delgado Juárez, P Mostbauer, A Knapp, W Müller, S Tertsch, A Bockreis, H Insam
The aim of the study was to investigate the option to purify biogas from small-scale biogas plants by entrapping CO2 and H2S with regionally available biomass ash. Connected to the existing biogas plant Neustift (Tyrol) wood ash placed in a 1 m(3) container was used as a trap for CO2 and H2S in the biogas. With the process conditions chosen, for a period of a few hours CO2 was trapped resulting in pure methane. The removal of H2S was much longer-lasting (up to 34 d). The cumulative H2S uptake by the biomass ash ranged from 0...
October 7, 2017: Waste Management
Andrey A Bezrukov, Pascal D C Dietzel
The metal-organic framework [Y(tbpp)]·nDMF (1) was synthesized from yttrium(III) nitrate and the tritopic linker tris(4'-carboxy[1,1'-biphenyl]-4-yl)phosphine (H3tbpp). The distance between the coordinating atoms of the carboxylate groups of the extended tridentate phosphine linker is more than 1.8 nm, resulting in an average pore dimension of 0.9 nm in the noninterpenetrated metal-organic framework. The material exhibits high thermal stability and permanent porosity after removal of guest molecules from the one-dimensional pore system...
October 9, 2017: Inorganic Chemistry
Verica Pavlic, Zlata Brkic, Sasa Marin, Smiljka Cicmil, Mirjana Gojkov-Vukelic, Akira Aoki
Laser ablation is recently suggested as a most effective and reliable technique for depigmentation of melanin hyperpigmented gingiva. To date, different lasers have been used for gingival depigmentation (CO2, diode, Nd:YAG, Er:YAG and Er,Cr:YSGG lasers). The use of Er:YAG laser for depigmentation of melanin hyperpigmented gingiva has gained increasing importance in recent years. The purpose of this study was to report removal of gingival melanin pigmentation using an Er:YAG laser in a literature review. The main outcomes, such as improvement of signs (clinical parameters of bleeding, erythema, swelling and wound healing), symptoms (pain) and melanin recurrence/repigmentation were measured...
October 6, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Ireneusz Ślesak, Halina Ślesak, Jerzy Kruk
RubisCO (D-ribulose 1,5-bisphosphate carboxylase/oxygenase) is Earth's main enzyme responsible for CO2 fixation via carboxylation of ribulose-1,5-bisphosphate (RuBP) into organic matter. Besides the carboxylation reaction, RubisCO also catalyzes the oxygenation of RuBP by O2 , which is probably as old as its carboxylation properties. Based on molecular phylogeny, the occurrence of the reactive oxygen species (ROS)-removing system and kinetic properties of different RubisCO forms, we postulated that RubisCO oxygenase activity appeared in local microoxic areas, yet before the appearance of oxygenic photosynthesis...
October 4, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
Collin P Ward, Sarah G Nalven, Byron C Crump, George W Kling, Rose M Cory
In sunlit waters, photochemical alteration of dissolved organic carbon (DOC) impacts the microbial respiration of DOC to CO2. This coupled photochemical and biological degradation of DOC is especially critical for carbon budgets in the Arctic, where thawing permafrost soils increase opportunities for DOC oxidation to CO2 in surface waters, thereby reinforcing global warming. Here we show how and why sunlight exposure impacts microbial respiration of DOC draining permafrost soils. Sunlight significantly increases or decreases microbial respiration of DOC depending on whether photo-alteration produces or removes molecules that native microbial communities used prior to light exposure...
October 3, 2017: Nature Communications
Zhongliang Yao, Xiaoqian Ma
The effect of hydrothermal treatment (HTT) on Chinese fan palm pyrolysis was investigated. It indicated that HTT could effectively remove a large portion of alkali/alkaline earth metals and disrupt the chemical structure to a certain extent. HTT delayed the initial decomposition temperature but accelerated the pyrolysis process completely. HTT also increased the relative contents of both sugars and hydrocarbons in pyrolysis. At 210°C, HTT had the most significant promotion effect on the sugars formation with the relative content of 30...
September 21, 2017: Bioresource Technology
Zhaoliang Song, Hongyan Liu, Caroline A E Strömberg, Hailong Wang, Peter James Strong, Xiaomin Yang, Yuntao Wu
During silicate weathering, atmospheric carbon dioxide (CO2) is consumed and base cations are released from silicate minerals to form carbonate and bicarbonate ions, which are finally deposited as carbonate complexes. Continental silicate weathering constitutes a stable carbon sink that is an important influence on long-term climate change, as it sequesters atmospheric carbon dioxide at a million-year time scale. Traditionally, CO2 sequestered through silicate weathering is estimated by measuring the flux of the base cations to watersheds...
September 29, 2017: Science of the Total Environment
Lei Lei, Qi Zhang, Shuxian Shi, Shiping Zhu
Polymer membranes with switchable wettability have promising applications in smart separation. Hereby, we report highly porous poly(styrene-co-N,N-diethylaminoethyl methacrylate) (i.e., poly(St-co-DEA)) membranes with "open-cell" structure and CO2-switchable wettability prepared from water-in-oil (W/O) high internal phase emulsion (HIPE) templates. The "open-cell" porous structure facilitates fluid penetration through the membranes. The combination of CO2-switchable functionality and porous microstructure enable the membrane with CO2-switchable wettability from hydrophobic or superoleophilic to hydrophilic or superoleophobic through CO2 treatment in an aqueous system...
October 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Marcin Jędrzejczyk, Klaudia Zbudniewek, Jacek Rynkowski, Valérie Keller, Jacek Grams, Agnieszka M Ruppert, Nicolas Keller
α, β, γ, and δ polymorphs of 4.6-4.8 eV wide band gap Ga2O3 photocatalysts were prepared via a soft chemistry route. Their photocatalytic activity under 254 nm UV-C light in the degradation of gaseous toluene was strongly depending on the polymorph phase. α- and β-Ga2O3 photocatalysts enabled achieving high and stable conversions of toluene with selectivities to CO2 within the 50-90% range, by contrast to conventional TiO2 photocatalysts that fully deactivate very rapidly on stream in similar operating conditions with rather no CO2 production, no matter whether UV-A or UV-C light was used...
September 29, 2017: Environmental Science and Pollution Research International
Argyro Kokkoli, Yifeng Zhang, Irini Angelidaki
Biogas upgrading to natural gas quality has been under focus the recent years for increasing the utilization potential of biogas. Conventional methods for CO2 removal are expensive and have environmental challenges, such as increased emissions of methane in the atmosphere with serious greenhouse impact. In this study, an innovative microbial electrochemical separation cell (MESC) was developed to in-situ separate and regenerate CO2 via alkali and acid regeneration. The MESC was tested under different applied voltages, inlet biogas rates and electrolyte concentrations...
September 19, 2017: Bioresource Technology
Yomna H Abdelmoaty, Tsemre-Dingel Tessema, Nazgol Norouzi, Oussama M El-Kadri, Joseph B McGee Turner, Hani M El-Kaderi
Development of efficient sorbents for carbon dioxide (CO2) capture from flue gas or its removal from natural gas and landfill gas is very important for environmental protection. A new series of heteroatom-doped porous carbon was synthesized directly from pyrazole/KOH by thermolysis. The resulting pyrazole-derived carbons (PYDCs) are highly doped with nitrogen (14.9-15.5 wt %) as a result of the high nitrogen-to-carbon ratio in pyrazole (43 wt %) and also have a high oxygen content (16.4-18.4 wt %). PYDCs have a high surface area (SABET = 1266-2013 m(2) g(-1)), high CO2 Qst (33...
October 18, 2017: ACS Applied Materials & Interfaces
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