共查询到20条相似文献,搜索用时 31 毫秒
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为了研究包膜尿素对水田土壤排放NH3、NOx和CO2的影响,采用水稻盆栽的方法,探讨了在水稻不同生育期内不同种类包膜尿素对水田土壤排放NH3、NOx和CO2的影响。结果表明,包膜尿素处理对水田土壤排放NH3、NOx和CO2均具有抑制作用,与普通尿素相比,包膜尿素LP40、LPSS、BB、SC60 NH3的挥发总量降低了5.4%~19.3%,NOx的挥发总量降低了8.1%~23.4%,CO2的挥发总量降低了1.6%~13.0%;施用包膜尿素能够抑制水田土壤NH3、NOx和CO2的排放。 相似文献
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大气CO2、CH4、CO高精度观测混合标气配制方法 总被引:1,自引:0,他引:1
高精度、高准确度的大气CO2、CH4、CO浓度观测需使用以干洁大气为底气的标气.标气中水汽含量及CO2的δ13C对基于光学原理的观测系统有不可忽视的影响.本研究利用自组装的混合标气配制系统,以环境大气为底气,并通过添加高浓度气体或利用吸附剂吸附,调节目标物种浓度.CO2和CO吸附效率分别达99.7%和99.8%,标气水汽含量小于3.7×10-6(物质的量分数,下同),可配制不同浓度范围的CO2、CH4、CO混合标气.在青海瓦里关全球大气本底站配制环境大气浓度范围的标气,CO2、CH4、CO实际配制浓度同目标浓度的偏差小于10×10-6、30×10-9、30×10-9,CO2中δ13C同实际大气接近.本方法配制的标气已应用于我国本底站大气CO2、CH4、CO高精度观测,符合世界气象组织/全球大气观测(WMO/GAW)质量要求. 相似文献
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Lina Gan Kezhi Li Hejingying Niu Yue Peng Jianjun Chen Yuandong Huang Junhua Li 《Frontiers of Environmental Science & Engineering》2021,15(4):70
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SO2-4/TiO2对SO2-C7H16-TiO2复相光化学反应的影响 总被引:1,自引:0,他引:1
《环境化学》2003,22(5):450-453
研究了TiO2与SO2,C7H16复相光化学反应的光催化活性.在SO2-C7H16-O2-TiO2光催化反应过程中,TiO2表面可形成SO2-4/TiO2结构,它的存在可提高庚烷的光催化氧化速率,利用IR和XPS研究了反应过程中TiO2表面形成的SO2-4/TiO2结构. 相似文献
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Liu YANG Ye WU Jiaqi LI Shaojie SONG Xuan ZHENG Jiming HAO 《Frontiers of Environmental Science & Engineering》2015,9(4):675
Mass concentrations of PM10, PM2.5 and PM1 were measured near major roads in Beijing during six periods: summer and winter of 2001, winter of 2007, and periods before, during and after the 2008 Beijing Olympic Games. Since the control efforts for motor vehicles helped offset the increase of emissions from the rapid growth of vehicles, the averaged PM2.5 concentrations at roadsides during the sampling period between 2001 and 2008 fluctuated over a relatively small range. With the implementation of temporary traffic control measures during the Olympics, a clear “V” shaped curve showing the concentrations of particulate matter and other gaseous air pollutants at roadsides over time was identified. The average concentrations of PM10, PM2.5, CO and NO decreased by 31.2%, 46.3%, 32.3% and 35.4%, respectively, from June to August; this was followed by a rebound of all air pollutants in December 2008. Daily PM10 concentrations near major roads exceeded the National Ambient Air Quality Standard (Grade II) for 61.2% of the days in the non-Olympic periods, while only for 12.5% during the Olympics. The mean ratio of PM2.5/PM10 near major roads remained relatively stable at 0.55 (±0.108) on non-Olympic days. The ratio decreased to 0.48 (±0.099) during the Olympics due to a greater decline in fine particles than in coarse-mode PM. The ratios PM1/PM2.5 fluctuated over a wide range and were statistically different from each other during the sampling periods. The average ratios of PM1/PM2.5 on non-Olympic days were 0.71. 相似文献
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Yanjun Xue Yinghong Ji Xinyu Wang Huanli Wang Xiaobo Chen Xiaoli Zhang Jian Tian 《绿色能源与环境(英文)》2023,(3):864-873
In this work,we report the preparation of 1T’-MoS2/g-C3N4 nanocage(NC) heterostructure by loading 2D semi-metal noble-metal-free 1T’-MoS2 on the g-C3N4 nanocages(NCs).DFT calculation and experimental data have shown that the 1T’-MoS2/g-C3N4 NC heterostructure has a stronger light absorption capacity and larger specific surface area than pure g-C3N4 NCs and g-C3N 相似文献
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Jianbing WANG Guoqing WANG Chunli YANG Shaoxia YANG Qing HUANG 《Frontiers of Environmental Science & Engineering》2015,9(4):615
This research investigates the performances of RuO2/ZrO2-CeO2 in catalytic ozonation for water treatment. The results show that RuO2/ZrO2-CeO2 was active for the catalytic ozonation of oxalic acid and possessed higher stability than RuO2/Al2O3 and Ru/AC. In the catalytic ozonation of dimethyl phthalate (DMP), RuO2/ZrO2-CeO2 did not enhance the DMP degradation rate but significantly improved the total organic carbon (TOC) removal rate. The TOC removal in catalytic ozonation was 56% more than that in noncatalytic ozonation. However this does not mean the catalyst was very active because the contribution of catalysis to the overall TOC removal was only 30%. The adsorption of the intermediates on RuO2/ZrO2-CeO2 played an important role on the overall TOC removal while the adsorption of DMP on it was negligible. This adsorption difference was due to their different ozonation rates. In the catalytic ozonation of disinfection byproduct precursors with RuO2/ZrO2-CeO2, the reductions of the haloacetic acid and trihalomethane formation potentials (HAAFPs and THMFPs) for the natural water samples were 38%–57% and 50%–64%, respectively. The catalyst significantly promoted the reduction of HAAFPs but insignificantly improved the reduction of THMFPs as ozone reacts fast with the THMs precursors. These results illustrate the good promise of RuO2/ZrO2-CeO2 in catalytic ozonation for water treatment. 相似文献
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Sijia Song Zipeng Xing Ke Wang Huanan Zhao Peng Chen Zhenzi Li Wei Zhou 《绿色能源与环境(英文)》2023,(1):200-212
3D flower-like hierarchical mesoporous Bi4O5I2/MoS2 Z-scheme layered heterojunction photocatalyst was fabricated by oil bath and hydrothermal methods. The heterojunction with narrow band gap of ~1.95 eV extended the photoresponse to near-infrared region, which showed obvious photothermal effect due to the introduction of MoS2 with broad spectrum response. MoS2 nanosheets were anchored onto the surface of flower-like hierarchical m... 相似文献
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Zihao Li Yang Geng Lei Ma Xiaoyin Chen Junhua Li Huazhen Chang Johannes W. Schwank 《Frontiers of Environmental Science & Engineering》2020,14(4):65
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Jing Gu Hongtao Yu Xie Quan Shuo Chen Junfeng Niu 《Frontiers of Environmental Science & Engineering》2020,14(4):72
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Wei Tan Shaohua Xie Wenpo Shan Zhihua Lian Lijuan Xie Annai Liu Fei Gao Lin Dong Hong He Fudong Liu 《Frontiers of Environmental Science & Engineering》2022,16(5):60
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Jingke Song Chenyang Li Xuejiang Wang Songsong Zhi Xin Wang Jianhui Sun 《Frontiers of Environmental Science & Engineering》2021,15(6):129
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Kelei Huang Chunhu Li Xiuli Zhang Liang Wang Wentai Wang Xiangchao Meng 《绿色能源与环境(英文)》2023,(1):233-245
Establishing highly effective charge transfer channels in carbon nitride(g-C3N4) to enhance its photocatalytic activity is still a challenging issue. Herein, the delaminated 2D Ti3C2 MXene nanosheets were employed to decorate the P-doped tubular g-C3N4(PTCN)for engineering 1D/2D Schottky heterojunction(PTCN/TC) through electrostatic self-assembly. The optimized PTCN/TC exhibited the highest hydrogen evolution rate(565 μmol h-... 相似文献
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Shuangyang Zhao Chengxin Chen Jie Ding Shanshan Yang Yani Zang Nanqi Ren 《Frontiers of Environmental Science & Engineering》2022,16(3):36
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大气二次细颗粒物(secondary fine particulate matters,SFPMs)是我国城市大气PM_(2.5)的主要组成部分。然而由于PM_(2.5)组成成份复杂,其毒性产生的来源并不明确。在本研究中,我们以二氧化铈(CeO_2)超细颗粒物(UFPs)为大气细矿物质颗粒模型,研究了SO_2气体在模拟大气环境中,如湿度(RH)、紫外光照(UV)和NO_2存在条件下,在CeO_2UFPs界面经多相反应生成的二次无机细颗粒物的性质及与细胞毒性的构效关系。实验通过实时高通量细胞分析系统,实时观察了CeO_2-SFPMs暴露对小鼠单核巨噬细胞(RAW264.7)增殖的影响;并进一步检测了CeO_2-SFPMs对细胞膜通透性和细胞凋亡的影响。结果表明,SO_2与CeO_2UFPs作用后可转化为硫酸盐,在有NO_2存在下转化更为明显。CeO_2-SFPMs对细胞毒性效应与其生成的环境条件相关,并具有时间效应性。RAW264.7细胞暴露于CeO_2-SFPMs 8 h,细胞增殖无明显变化;暴露8~25 h后,CeO_2-SFPMs对细胞增殖的抑制率随CeO_2@CeO_2+SO_2@CeO_2+SO_2+RH≈@CeO_2+SO_2+RH+UV@CeO_2+SO_2+RH+NO_2的顺序显著升高。CeO_2-SFPMs对Raw264.7细胞膜通透性和细胞凋亡的影响研究也证明CeO_2-SFPMs@CeO_2+SO_2+RH+NO_2产生的细胞毒性最明显。 相似文献
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The idea that trading is more costly the thinner the market is is common in most studies of market exchange with frictions. Surprisingly, this element is lacking from previous attempts to allow for frictions in pollution permit markets. This paper considers a CO2 cap-and-trade model where trading costs develop endogenously as a function of the market size. The pre-trade allocation of permits determines whether the market size can be strongly influenced by expectations that have a role because of adjustment costs. The pre-trade allocation also sets preconditions for endogenously vanishing trading costs and thus has nonstandard effects on long-run trading levels and market allocations. 相似文献
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Tao Yan Qianqian Yang Rui Feng Xiang Ren Yanxia Zhao Meng Sun Liangguo Yan Qin Wei 《Frontiers of Environmental Science & Engineering》2022,16(10):131
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Yang Yang Xiuzhen Zheng Wei Ren Jiafang Liu Xianliang Fu Sugang Meng Shifu Chen Chun Cai 《Frontiers of Environmental Science & Engineering》2022,16(11):137
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Felix Deutsch Jean Vankerkom Liliane Janssen Stijn Janssen Lszl Bencs Ren Van Grieken Frans Fierens Gerwin Dumont Clemens Mensink 《Ecological modelling》2009,217(3-4):230
The Eulerian Chemistry-Transport Model BelEUROS was used to calculate the concentrations of airborne PM10 and PM2.5 over Europe. Both primary as well as secondary particulate matter in the respirable size-range was taken into account. Especially PM2.5 aerosols are often formed in the atmosphere from gaseous precursor compounds. Comprehensive computer codes for the calculation of gas phase chemical reactions and thermodynamic equilibria between compounds in the gas-phase and the particulate phase had been implemented into the BelEUROS-model. Calculated concentrations of PM10 and PM2.5 are compared to observations, including both the spatial and daily, temporal distribution of particulate matter in Belgium for certain monitoring locations and periods. The concentrations of the secondary compounds ammonium, nitrate and sulfate have also been compared to observed values. BelEUROS was found to reproduce the observed concentrations rather well. The model was applied to assess the contribution of emissions derived from the sector agriculture in Flanders, the northern part of Belgium, to PM10- and PM2.5-concentrations. The results demonstrate the importance of ammonia emissions in the formation of secondary particulate matter. Hence, future European emission abatement policy should consider more the role of ammonia in the formation of secondary particles. 相似文献