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https://www.readbyqxmd.com/read/29216600/ethylene-formation-by-dehydration-of-ethanol-over-medium-pore-zeolites
#1
Kinga Gołąbek, Karolina A Tarach, Urszula Filek, Kinga Góra-Marek
In this work, the role of pore arrangement of 10-ring zeolites ZSM-5, TNU-9 and IM-5 on their catalytic properties in ethanol transformation were investigated. Among all the studied catalysts, the zeolite IM-5, characterized by limited 3-dimensionality, presented the highest conversion of ethanol and the highest yields of diethyl ether (DEE) and ethylene. The least active and selective to ethylene and C3+ products was zeolite TNU-9 with the largest cavities formed on the intersection of 10-ring channels. The catalysts varied, however, in lifetime, and their deactivation followed the order: IM-5>TNU-9>ZSM-5...
November 23, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29209795/exploring-anaerobic-environments-for-cyanide-and-cyano-derivatives-microbial-degradation
#2
REVIEW
Víctor M Luque-Almagro, Purificación Cabello, Lara P Sáez, Alfonso Olaya-Abril, Conrado Moreno-Vivián, María Dolores Roldán
Cyanide is one of the most toxic chemicals for living organisms described so far. Its toxicity is mainly based on the high affinity that cyanide presents toward metals, provoking inhibition of essential metalloenzymes. Cyanide and its cyano-derivatives are produced in a large scale by many industrial activities related to recovering of precious metals in mining and jewelry, coke production, steel hardening, synthesis of organic chemicals, and food processing industries. As consequence, cyanide-containing wastes are accumulated in the environment becoming a risk to human health and ecosystems...
December 5, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29206444/multi-regional-input-output-analysis-of-spatial-temporal-evolution-driving-force-for-carbon-emissions-embodied-in-interprovincial-trade-and-optimization-policies-a-case-study-of-northeast-industrial-district-in-china
#3
Hao Cheng, Suocheng Dong, Fujia Li, Yang Yang, Shantong Li, Yu Li
In the counties with rapid economy and carbon emissions(CEs) growth, CEs embodied in interprovincial trade(CEs-PT) significantly impacts the CEs amount and structure, and represents a key issue to consider in CEs reduction policies formulation. This study applied EEBT and two-stage SDA model to analyze the characteristics and driving force of spatial-temporal evolution for net CEs-PT outflow in the Northeast Industrial District of China(NID). We found that, during 1997-2007, the net CEs-PT flowed out from NID to 16 south and east provinces, then to 23 provinces all over China, and its amount has increased 216...
December 5, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29201243/on-the-role-of-acidity-in-bulk-and-nanosheet-t-mfi-t-al3-ga3-fe3-b3-zeolites-in-the-methanol-to-hydrocarbons-reaction
#4
Lingqian Meng, Xiaochun Zhu, Brahim Mezari, Robert Pestman, Wannaruedee Wannapakdee, Emiel J M Hensen
The influence of framework substituents (Al3+, Ga3+, Fe3+ and B3+) and morphology (bulk vs. nanometer-sized sheets) of MFI zeolites on the acidity and catalytic performance in the methanol-to-hydrocarbons (MTH) reaction was investigated. The Brønsted acid density and strength decreased in the order Al(OH)Si>Ga(OH)Si>Fe(OH)Si≫B(OH)Si. Pyridine 15N NMR spectra confirmed the differences in the Brønsted and Lewis acid strengths but also provided evidence for site heterogeneity in the Brønsted acid sites...
October 23, 2017: ChemCatChem
https://www.readbyqxmd.com/read/29195198/single-microbial-fuel-cell-reactor-for-coking-wastewater-treatment-simultaneous-carbon-and-nitrogen-removal-with-zero-alkaline-consumption
#5
Di Wu, Xiaoyun Yi, Rong Tang, Chunhua Feng, Chaohai Wei
The use of several individual reactors for sequential removal of organic compounds and nitrogen, in addition to the required alkaline addition in aerobic reactors, remain outstanding technical challenges to the traditional biological treatment of coking wastewater. Here, we report the utilization of a single microbial fuel cell (MFC) reactor that performs simultaneous carbon and nitrogen removal with zero alkaline consumption, as evidenced by the results of the batch-fed and continuous-flow experiments. The MFC exhibited faster reaction kinetics for COD and total nitrogen (TN) removal than the same configured reactor analogous to the traditional aerobic biological reactor (ABR)...
November 28, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29189447/effects-of-a-peer-evaluation-technique-on-nursing-students-anxiety-levels
#6
Patricia Stewart, Debbie Greene, Sallie Coke
Techniques to help decrease students' stress and anxiety during a nursing program can be beneficial to their overall health and mental well-being. A quasi-experimental design was used to examine if a peer evaluation technique during clinical skill practice sessions decreases anxiety prior to skill performance evaluation with nursing faculty. Participant feedback supports the integration of a peer evaluation technique when learning clinical skills.
November 16, 2017: Nurse Educator
https://www.readbyqxmd.com/read/29168925/enhanced-degradation-of-1-naphthol-in-landfill-leachate-using-arthrobacter-sp
#7
Wenyong Hu, Xiaobo Min, Xinyu Li, Jingyi Liu, Haibin Yu, Yuan Yang, Jiachao Zhang, Lin Luo, Liyuan Chai, Yaoyu Zhou
Arthrobacter sp. named as JY5-1 was isolated from the contaminated soil of a coking plant, which can degrade 1-naphthol as the sole carbon source. Through identification of species, analysis of the optimal degradation condition and kinetic equation, the degradation characteristic of Arthrobacter sp. JY5-1 was obtained. Afterwards, the acclimated strain was added into the bioreactor to observe treatment performance of landfill leachate. The results showed the optimal conditions for strain JY5-1 biodegradation in the study were pH 7...
November 23, 2017: Environmental Technology
https://www.readbyqxmd.com/read/29147739/effects-of-coking-wastewater-on-the-growth-of-five-wetland-plant-species
#8
Yulin Xiang, Yukun Xiang, Lipeng Wang, Yurong Jiao
In order to investigate the effect of wetland plants in the treatment of coking wastewater, Oenanthe javanica (Blume) DC (OC), Artemisia selengensis Turcz. ex Bess. (AB), Echinochloa crusgalli (L.) Beauv. (EB), Brasenia schreberi J.F.Gmel. (BG), and Lythrum salicaria L. (LL) were used to remove ammonia-nitrogen and chemical oxygen demand (COD) from coking wastewater. Results showed high concentrations (> 30%, diluted by deionized water) of coking wastewater caused decreased photosynthetic rate, transpiration rate, and relative growth rate in all studied plants...
November 16, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29145137/uncertainty-in-positive-matrix-factorization-solutions-for-pahs-in-surface-sediments-of-the-yangtze-river-estuary-in-different-seasons
#9
Ruimin Liu, Cong Men, Wenwen Yu, Fei Xu, Qingrui Wang, Zhenyao Shen
To examine the variabilities of source contributions in the Yangtze River Estuary (YRE), the uncertainty based on the positive matrix factorization (PMF) was applied to the source apportionment of the 16 priority PAHs in 120 surface sediment samples from four seasons. Based on the signal-to-noise ratios, the PAHs categorized as "Bad" might drop out of the estimation of bootstrap. Next, the spatial variability of residuals was applied to determine which species with non-normal curves should be excluded. The median values from the bootstrapped solutions were chosen as the best estimate of the true factor contributions, and the intervals from 5th to 95th percentile represent the variability in each sample factor contribution...
October 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/29144286/effects-and-mechanistic-aspects-of-absorbing-organic-compounds-by-coking-coal
#10
Kejia Ning, Junfeng Wang, Hongxiang Xu, Xianfeng Sun, Gen Huang, Guowei Liu, Lingmei Zhou
Coal is a porous medium and natural absorbent. It can be used for its original purpose after adsorbing organic compounds, its value does not reduce and the pollutants are recycled, and then through systemic circulation of coking wastewater zero emissions can be achieved. Thus, a novel method of industrial organic wastewater treatment using adsorption on coal is introduced. Coking coal was used as an adsorbent in batch adsorption experiments. The quinoline, indole, pyridine and phenol removal efficiencies of coal adsorption were investigated...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29124641/the-mineralization-of-oxalic-acid-and-bio-treated-coking-wastewater-by-catalytic-ozonation-using-nickel-oxide
#11
Kaiyi Wu, Fengzhen Zhang, Haizhen Wu, Chaohai Wei
Coking wastewater after biological treatment still possesses potential environmental risk and should be mineralized further. This work focused on the mineralization of bio-treated coking wastewater using catalytic ozonation by NiO. First, oxalic acid, the typical by-product of advanced oxidation process (AOPs), was used to test the catalytic performance of NiOs, prepared by modified hydrothermal methods upon addition of different surfactants. This demonstrated that NiO upon addition of hexadecyltrimethylammonium (CTAB) had the best catalytic activity, due to its high concentration surface hydroxyl density and strong stability...
November 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29114997/in-vitro-modeling-of-hiv-proviral-activity-in-microglia
#12
Lee A Campbell, Christopher T Richie, Yajun Zhang, Emily J Heathward, Lamarque M Coke, Emily Y Park, Brandon K Harvey
Microglia, the resident macrophages of the brain, play a key role in the pathogenesis of HIV-associated neurocognitive disorders (HAND) due to their productive infection by HIV. This results in the release of neurotoxic viral proteins and pro-inflammatory compounds which negatively affect the functionality of surrounding neurons. Because models of HIV infection within the brain are limited, we aimed to create a novel microglia cell line with an integrated HIV provirus capable of recreating several hallmarks of HIV infection...
November 8, 2017: FEBS Journal
https://www.readbyqxmd.com/read/29071772/ti3alc2-max-phase-as-an-efficient-catalyst-for-oxidative-dehydrogenation-of-n-butane
#13
Wesley Ng, Edwin Gnanakumar, Gadi Rothenberg, Erdni Batyrev, Sandeep Sharma, Pradeep Pujari, Heather Greer, Wuzong Zhou, Ridwan Sakidja, Michel Barsoum, N R Shiju
Light alkenes are important raw materials for the synthesis of polymers and other products. Traditionally they are obtained from steam cracking and catalytic cracking. However, (oxidative) dehydrogenation of alkanes is gaining more importance to produce alkenes directly from natural gas. Here we report that Ti3AlC2, a MAX phase, which hitherto had not used in catalysis, efficiently catalyses the ODH of n-butane to butenes and butadiene, important intermediates for the synthesis of polymers and other compounds...
October 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29068344/surface-water-polycyclic-aromatic-hydrocarbons-pah-in-urban-areas-of-nanjing-china
#14
Chunhui Wang, Shenglu Zhou, Shaohua Wu, Jing Song, Yaxing Shi, Baojie Li, Hao Chen
The concentration, sources and environmental risks of polycyclic aromatic hydrocarbons (PAHs) in surface water in urban areas of Nanjing were investigated. The range of ∑16PAHs concentration is between 4,076 and 29,455 ng/L, with a mean of 17,212 ng/L. The composition of PAHs indicated that 2- and 3-ring PAHs have the highest proportion in all PAHs, while the 5- and 6-ring PAHs were the least in proportion. By diagnostic ratio analysis, combustion and petroleum were a mixture input that contributed to the water PAH in urban areas of Nanjing...
October 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29066262/distribution-characteristics-sources-and-ecological-risk-assessment-of-polycyclic-aromatic-hydrocarbons-in-sediments-from-the-qinhuangdao-coastal-wetland-china
#15
Faxiang Lin, Bin Han, Yu Ding, Qian Li, Wei Gao, Li Zheng
Sixteen USEPA priority polycyclic aromatic hydrocarbons (PAHs) were analyzed by gas chromatography-mass spectrometry. Twenty-three samples were collected from the surface sediments of Qinhuangdao coastal wetlands in this survey. This research aimed to identify the PAHs contamination level, composition pattern, pollution sources, and assess the ecological risk of PAHs. The results showed that the sum of PAH concentrations ranged from 341.61ng/g to 4703.80ng/g (mean: 1367.80ng/g), which is higher than the reported values for different wetlands worldwide...
October 21, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29065480/effect-of-steam-deactivation-severity-of-zsm-5-additives-on-lpg-olefins-production-in-the-fcc-process
#16
Andrey A Gusev, Antonios C Psarras, Konstantinos S Triantafyllidis, Angelos A Lappas, Paul A Diddams
ZSM-5-containing catalytic additives are widely used in oil refineries to boost light olefin production and improve gasoline octanes in the Fluid Catalytic Cracking (FCC) process. Under the hydrothermal conditions present in the FCC regenerator (typically >700 °C and >8% steam), FCC catalysts and additives are subject to deactivation. Zeolites (e.g., Rare Earth USY in the base catalyst and ZSM-5 in Olefins boosting additives) are prone to dealumination and partial structural collapse, thereby losing activity, micropore surface area, and undergoing changes in selectivity...
October 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29048823/-analysis-of-aromatic-hydrocarbons-in-cracking-products-of-jet-fuel-by-comprehensive-two-dimensional-gas-chromatography-mass-spectrometry
#17
Haijing Li, Xiangwen Zhang
As coking precursors, aromatic hydrocarbons have an effect on the cracking stability of fuels. A method for identifying and quantitating aromatics in the supercritical cracking products of jet fuel was established by comprehensive two-dimensional gas chromatography coupled with mass spectrometry (GC×GC-MS). The effects of main chromatographic conditions such as initial oven temperature and modulation period on the separation of supercritical cracking products were studied. The method has good separation ability for polycyclic aromatic hydrocarbons (PAH) isomers...
August 8, 2017: Se Pu, Chinese Journal of Chromatography
https://www.readbyqxmd.com/read/29034721/biological-monitoring-of-exposure-to-low-concentrations-of-benzene-in-workers-at-a-metallurgical-coke-production-plant-new-insights-into-s-phenylmercapturic-acid-and-urinary-benzene
#18
Piero Lovreglio, Giuseppe De Palma, Anna Barbieri, Roberta Andreoli, Ignazio Drago, Luciano Greco, Elisabetta Gallo, Laura Diomede, Pietro Scaramuzzo, Maria Cristina Ricossa, Jacopo Fostinelli, Pietro Apostoli, Leonardo Soleo
CONTEXT: Urinary S-phenylmercapturic acid (SPMA) and benzene (U-Ben) are usually measured at the end of the work shift (ES), although their kinetic of elimination is not clearly known. OBJECTIVE: To investigate SPMA and U-Ben elimination 16 h after the ES, in 93 coke production workers exposed to low benzene concentrations. MATERIALS AND METHODS: Airborne benzene (A-Ben) was measured by passive samplings, while SPMA, U-Ben, methyl-tert-butyl ether (U-MTBE), cotinine (U-Cot) and creatinine were determined on urine samples collected at ES and before the beginning of the next work shift (next BS)...
October 16, 2017: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://www.readbyqxmd.com/read/29031116/evaluation-of-fluoride-bioremediation-and-production-of-biomolecules-by-living-cyanobacteria-under-fluoride-stress-condition
#19
Gargi Biswas, Sohini Guha Thakurta, Jitamanyu Chakrabarty, Kalyan Adhikari, Susmita Dutta
Application of microalgae for defluoridation has gained interest in recent years. In the present study, bioremediation of fluoride using living cyanobacteria, Starria zimbabweensis, collected from wastewater of coke-oven effluent treatment plant, Durgapur, India, has been investigated. Initially, the cyanobacterial strain was grown in BG11 medium at 25°C, 45μmol/m(2)/s irradiation in 18h: 6h light:dark cycle in an algal incubator. Samples were withdrawn after 2 days interval and analyzed for its dry biomass and lipid content...
October 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28991868/type-2-diabetes-in-the-older-adult-the-need-for-assessment-of-frailty
#20
Lola A Coke, Cheryl R Dennison Himmelfarb
No abstract text is available yet for this article.
November 2017: Journal of Cardiovascular Nursing
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