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Journal of Environmental Sciences (China)

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https://www.readbyqxmd.com/read/29628112/production-of-ammonia-from-plasma-catalytic-decomposition-of-urea-effects-of-carrier-gas-composition
#1
Xing Fan, Jian Li, Danqi Qiu, Tianle Zhu
Effects of carrier gas composition (N2 /air) on NH3 production, energy efficiency regarding NH3 production and byproducts formation from plasma-catalytic decomposition of urea were systematically investigated using an Al2 O3 -packed dielectric barrier discharge (DBD) reactor at room temperature. Results show that the presence of O2 in the carrier gas accelerates the conversion of urea but leads to less generation of NH3 . The final yield of NH3 in the gas phase decreased from 70.5%, 78.7%, 66.6% and 67.2% to 54...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628111/photocatalytic-degradation-of-aqueous-methyl-orange-using-nitrogen-doped-tio-2-photocatalyst-prepared-by-novel-method-of-ultraviolet-assisted-thermal-synthesis
#2
Mohsen Nasirian, Mehrab Mehrvar
A nitrogen-doped titanium dioxide composite photocatalyst (N-TiO2 ) with heterojunction structures is synthesized by three different approaches: a novel UV-assisted thermal synthesis, annealing, and microwave technique. Photocatalytic activities of synthesized photocatalysts are evaluated by the degradation of Methyl Orange under ultraviolet light types A (UV-A), B (UV-B), and C (UV-C), visible light, and direct sunlight irradiation. Results show that by using N-TiO2 photocatalyst prepared by the UV-assisted thermal synthesis and annealing, the degradation increases by 16...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628110/photocatalytic-properties-of-p25-doped-tio-2-composite-film-synthesized-via-sol-gel-method-on-cement-substrate
#3
Xiang Guo, Lei Rao, Peifang Wang, Chao Wang, Yanhui Ao, Tao Jiang, Wanzhong Wang
TiO2 films have received increasing attention for the removal of organic pollutants via photocatalysis. To develop a simple and effective method for improving the photodegradation efficiency of pollutants in surface water, we herein examined the preparation of a P25-TiO2 composite film on a cement substrate via a sol-gel method. In this case, Rhodamine B (RhB) was employed as the target organic pollutant. The self-generated TiO2 film and the P25-TiO2 composite film were characterized by X-ray diffraction (XRD), N2 adsorption/desorption measurements, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and diffuse reflectance spectroscopy (DRS)...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628109/analysis-of-the-influencing-factors-of-paes-volatilization-from-typical-plastic-products
#4
Weidong Chen, Chenchen Chi, Chen Zhou, Meng Xia, Cees Ronda, Xueyou Shen
The primary emphasis of this research was to investigate the foundations of phthalate (PAEs) pollutant source researches and then firstly confirmed the concept of the coefficient of volatile strength, namely phthalate total content in per unit mass and unit surface area of pollutant sources. Through surveying and evaluating the coefficient of volatile strength of PAEs from typical plastic products, this research carried out reasonable classification of PAEs pollutant sources into three categories and then investigated the relationship amongst the coefficient of volatile strength as well as other environmental factors and the concentration level of total PAEs in indoor air measured in environment chambers...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628108/comparative-toxicity-of-silver-nanoparticles-and-silver-ions-to-escherichia-coli
#5
Yoojin Choi, Hyun-A Kim, Kyoung-Woong Kim, Byung-Tae Lee
With the increase in silver (Ag)-based products in our lives, it is essential to test the potential toxicity of silver nanoparticles (AgNPs) and silver ions (Ag ions) on living organisms under various conditions. Here, we investigated the toxicity of AgNPs with Ag ions to Escherichia coli K-12 strain under various conditions. We observed that both AgNPs and Ag ions display antibacterial activities, and that Ag ions had higher toxicity to E. coli K-12 strain than AgNPs under the same concentrations. To understand the toxicity of AgNPs at a cellular level, reactive oxygen species (ROS) enzymes were detected for use as antioxidant enzymatic biomarkers...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628107/arsenate-biotransformation-by-microcystis-aeruginosa-under-different-nitrogen-and-phosphorus-levels
#6
Feifei Che, Miaomiao Du, Changzhou Yan
The arsenate (As(V)) biotransformation by Microcystis aeruginosa in a medium with different concentrations of nitrogen (N) and phosphorus (P) has been studied under laboratory conditions. When 15μg/L As(V) was added, N and P in the medium showed effective regulation on arsenic (As) metabolism in M. aeruginosa, resulting in significant differences in the algal growth among different N and P treatments. Under 0.2mg/L P treatment, increases in N concentration (4-20mg/L) significantly stimulated the cell growth and therefore indirectly enhanced the production of dimethylarsinic acid (DMA), the main As metabolite, accounting for 71%-79% of the total As in the medium...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628106/single-and-multiple-stressor-effect-of-road-deicers-and-cu-on-atlantic-salmon-salmo-salar-alevins-from-hatching-till-swim-up
#7
Urma Mahrosh, Bjørn Olav Rosseland, Brit Salbu, Hans-Christian Teien
Road salts are frequently used for deicing of roads in the Nordic countries. During snow-melt, the road run-off containing high concentrations of road salt and various metals such as Cu remobilized from sand, silt and dust may negatively influence organisms in downstream receiving water bodies. The present work focuses on the impact of road salt (NaCl) and Cu, separately and in mixtures on Atlantic salmon alevins from hatching till swim-up. The results showed that high road salt concentrations could induce a series of negative effects in alevins such as reduced growth, deformities, delayed swim-up and mortality...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628105/nb-2-o-5-nanowires-in-situ-grown-on-carbon-fiber-a-high-efficiency-material-for-the-photocatalytic-reduction-of-cr-vi
#8
Yucheng Du, Shihao Zhang, Jinshu Wang, Junshu Wu, Hongxing Dai
Niobium oxide nanowire-deposited carbon fiber (CF) samples were prepared using a hydrothermal method with amorphous Nb2 O5 ·nH2 O as precursor. The physical properties of the samples were characterized by means of numerous techniques, including X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), UV-visible spectroscopy (UV-vis), N2 adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628104/potential-of-secondary-aerosol-formation-from-chinese-gasoline-engine-exhaust
#9
Zhuofei Du, Min Hu, Jianfei Peng, Song Guo, Rong Zheng, Jing Zheng, Dongjie Shang, Yanhong Qin, He Niu, Mengren Li, Yudong Yang, Sihua Lu, Yusheng Wu, Min Shao, Shijin Shuai
Light-duty gasoline vehicles have drawn public attention in China due to their significant primary emissions of particulate matter and volatile organic compounds (VOCs). However, little information on secondary aerosol formation from exhaust for Chinese vehicles and fuel conditions is available. In this study, chamber experiments were conducted to quantify the potential of secondary aerosol formation from the exhaust of a port fuel injection gasoline engine. The engine and fuel used are common in the Chinese market, and the fuel satisfies the China V gasoline fuel standard...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628103/rates-and-processes-affecting-as-speciation-and-mobility-in-lake-sediments-during-aging
#10
Alan Lock, Dirk Wallschläger, Nelson Belzile, Graeme Spiers, Celine Gueguen
Sediments from an arsenic (As) contaminated groundwater vent site were used to investigate As(III) binding, transformation and redistribution in native and iron oxide amended lake sediments using aging spiked batch reactions and a sequential extraction procedure that maintains As(V) and As(III) speciation. In the native sediments, fractionation analysis revealed that 10% of the spiked As(III) remained intact after a 32-day aging experiment and was predominantly adsorbed to the strongly sorbed (NH4 H2 PO4 extractable) and amorphous Fe oxide bound (H3 PO4 extractable) fractions...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628102/mesoporous-wo-3-graphene-photocatalyst-for-photocatalytic-degradation-of-methylene-blue-dye-under-visible-light-illumination
#11
Adel A Ismail, M Faisal, Adel Al-Haddad
Advanced oxidation technologies are a friendly environmental approach for the remediation of industrial wastewaters. Here, one pot synthesis of mesoporous WO3 and WO3 -graphene oxide (GO) nanocomposites has been performed through the sol-gel method. Then, platinum (Pt) nanoparticles were deposited onto the WO3 and WO3 -GO nanocomposite through photochemical reduction to produce mesoporous Pt/WO3 and Pt/WO3 -GO nanocomposites. X-ray diffraction (XRD) findings exhibit a formation of monoclinic and triclinic WO3 phases...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628101/theoretical-study-on-the-formation-mechanism-of-polychlorinated-dibenzothiophenes-thianthrenes-from-2-chlorothiophenol-molecules
#12
Xiaoqing Yu, Jiamin Chang, Xian Liu, Wenxiao Pan, Aiqian Zhang
Homogeneous formation of polychlorinated dibenzothiophenes/thianthrenes (PCDT/TAs), sulfurated compounds analogous to polychlorinated dibenzo-p-dioxin/dibenzofurans (PCDD/Fs), has been well-documented to occur via radical-radical coupling reactions from chlorinated thiophenol precursors. However, the current understanding of the formation mechanism of PCDT/TAs is exclusively limited to the inherent point of view that chlorothiophenoxy radicals act as the only required intermediates for PCDT/TAs. This study investigates reaction pathways for the formation of PCDT/TAs involving two new types of radical species, i...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628100/competitive-effects-of-humic-acid-and-wastewater-on-adsorption-of-methylene-blue-dye-by-activated-carbon-and-non-imprinted-polymers
#13
Audrey Murray, Banu Örmeci
Natural organic matter (NOM), present in natural waters and wastewater, decreases adsorption of micropollutants, increasing treatment costs. This research investigated mechanisms of competition for non-imprinted polymers (NIPs) and activated carbon with humic acid and wastewater. Three different types of activated carbons (Norit PAC 200, Darco KB-M, and Darco S-51) were used for comparison with the NIP. The lower surface area and micropore to mesopore ratio of the NIP led to decreased adsorption capacity in comparison to the activated carbons...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628099/protecting-the-photosynthetic-performance-of-snap-bean-under-free-air-ozone-exposure
#14
Lu Zhang, Yasutomo Hoshika, Elisa Carrari, Kent O Burkey, Elena Paoletti
Tropospheric ozone (O3 ) is a major air pollutant and causes serious injury to vegetation. To protect sensitive plants from O3 damage, several agrochemicals have been assessed, including cytokinin (e.g., kinetin, KIN) and ethylenediurea (EDU) with cytokinin-like activity. In higher plant, leaves are primarily injured by O3 and protective agrochemicals are often applied by leaf spraying. To our knowledge, the mitigating abilities of EDU and KIN have not been compared directly in a realistic setup. In the present research, impacts of elevated O3 (2× ambient O3 , 24hr per day, for 8days) on an O3 sensitive line (S156) of snap bean (Phaseolus vulgaris), which is often used for biomonitoring O3 pollution, were studied in a free air controlled exposure system...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628098/preparation-and-properties-of-chitosan-metal-complex-some-factors-influencing-the-adsorption-capacity-for-dyes-in-aqueous-solution
#15
Sadia Rashid, Chensi Shen, Jing Yang, Jianshe Liu, Jing Li
Chitosan-metal complexes have been widely studied in wastewater treatment, but there are still various factors in complex preparation which are collectively responsible for improving the adsorption capacity need to be further studied. Thus, this study investigates the factors affecting the adsorption ability of chitosan-metal complex adsorbents, including various kinds of metal centers, different metal salts and crosslinking degree. The results show that the chitosan-Fe(III) complex prepared by sulfate salts exhibited the best adsorption efficiency (100%) for various dyes in very short time duration (10min), and its maximum adsorption capacity achieved 349...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628097/sustainable-green-technology-on-wastewater-treatment-the-evaluation-of-enhanced-single-chambered-up-flow-membrane-less-microbial-fuel-cell
#16
Wei-Eng Thung, Soon-An Ong, Li-Ngee Ho, Yee-Shian Wong, Fahmi Ridwan, Yoong-Ling Oon, Yoong-Sin Oon, Harvinder Kaur Lehl
This study demonstrated the potential of single chamber up-flow membrane-less microbial fuel cell (UFML-MFC) in wastewater treatment and power generation. The purpose of this study was to evaluate and enhance the performance under different operational conditions which affect the chemical oxygen demand (COD) reduction and power generation, including the increase of KCl concentration (MFC1) and COD concentration (MFC2). The results showed that the increase of KCl concentration is an important factor in up-flow membrane-less MFC to enhance the ease of electron transfer from anode to cathode...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628096/electronic-property-dependent-interactions-between-tetracycline-and-graphene-nanomaterials-in-aqueous-solution
#17
Lin He, Fei-Fei Liu, Mengyao Zhao, Zhen Qi, Xuefei Sun, Muhammad Zaheer Afzal, Xiaomin Sun, Yanhui Li, Jingcheng Hao, Shuguang Wang
Understanding the interactions between graphene nanomaterials (GNMs) and antibiotics in aqueous solution is critical to both the engineering applications of GNMs and the assessment of their potential impact on the fate and transport of antibiotics in the aquatic environment. In this study, adsorption of one common antibiotic, tetracycline, by graphene oxide (GO) and reduced graphene oxide (RGO) was examined with multi-walled carbon nanotubes (MWCNTs) and graphite as comparison. The results showed that the tetracycline adsorption capacity by the four selected carbonaceous materials on the unit mass basis followed an order of GO>RGO>MWCNTs>graphite...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628095/a-bibliometric-review-of-nitrogen-research-in-eutrophic-lakes-and-reservoirs
#18
REVIEW
Xiaolong Yao, Yunlin Zhang, Lu Zhang, Yongqiang Zhou
The global application of nitrogen is far greater than phosphorus, and it is widely involved in the eutrophication of lakes and reservoirs. We used a bibliometric method to quantitatively and qualitatively evaluate nitrogen research in eutrophic lakes and reservoirs to reveal research developments, current research hotspots, and emerging trends in this area. A total of 2695 articles in the past 25years from the online database of the Scientific Citation Index Expended (SCI-Expanded) were analyzed. Articles in this area increased exponentially from 1991 to 2015...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628094/low-temperature-conversion-of-ammonia-to-nitrogen-in-water-with-ozone-over-composite-metal-oxide-catalyst
#19
Yunnen Chen, Ye Wu, Chen Liu, Lin Guo, Jinxia Nie, Yu Chen, Tingsheng Qiu
As one of the most important water pollutants, ammonia nitrogen emissions have increased year by year, which has attracted people's attention. Catalytic ozonation technology, which involves production of ·OH radical with strong oxidation ability, is widely used in the treatment of organic-containing wastewater. In this work, MgO-Co3 O4 composite metal oxide catalysts prepared with different fabrication conditions have been systematically evaluated and compared in the catalytic ozonation of ammonia (50mg/L) in water...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29628093/anaerobic-treatment-of-source-separated-domestic-bio-wastes-with-an-improved-upflow-solid-reactor-at-a-short-hrt
#20
Hongliang Wang, Shikun Zhu, Bo Qu, Yu Zhang, Bin Fan
Anaerobic treatment is the core technology for resource and energy recovery from source-separated domestic bio-wastes. The higher efficiency of an improved upflow solid reactor (IUSR) designed in this study was demonstrated in the treatment of concentrated black water and kitchen waste. The highest methane production of 48L/person/day was achieved at the hydraulic retention time (HRT) of 7days, while the other measures of performance at the HRT of 8.3days were better than at the HRT of 7 or 10days, achieving a methane production of 43L/person/day, removal of total chemical oxygen demand (TCOD) of 89%, removal of soluble chemical oxygen demand (SCOD) of 92%, and conversion of chemical oxygen demand (COD) to methane of 71%...
April 2018: Journal of Environmental Sciences (China)
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