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Tong Zhang,Shaofeng Zhu,Guangsheng Fei,Yuanhang Ma 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6
In this study, industrial waste tailings were used as the main raw material to prepare porous ceramic by injection molding. The porous ceramic samples were surface treated by γ-Aminopropyl triethoxysilane solution to be used as adsorbent to removeCu(II) from solution. The effects of sintering technology on properties of porous ceramic samples were studied. Meanwhile,the effects of test conditions on the adsorption characteristics of samples were also studied. The samples were analyzed by Xray diffraction, FTIR, and SEM. Atomic absorption spectrophotometer was used to determine the changes of Cu(II)concentration in the aqueous solution before and after adsorption. The results show that the compressive strength of thesamples is increased with the increase of sintered temperature and extension of holding time. The average pore diameters ofthe samples are decreased and concentrated between 0.1 and 0.2mm with the increase of sintered temperature. The removalrates and the adsorption capacities of the samples to Cu(Ⅱ) are increased with the increase of solution temperature, increaseof pH value of the solution and the extension of the test time.
Yaqiang Li,Penghui Ren,Yuanhang Zhang,Shengxu Wang,Jinqiu Zhang,Peixia Yang,Anmin Liu,Guangzhao Wang,Zhidong Chen,Maozhong An 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
Finding proper additive to achieve copper superconformal electrodeposition is significantly important. Brilliant Green exhibits excellent suppressing ability to the copper electrodeposition according to electrochemicalanalysis. Meanwhile, 100 mg/L was selected as the optimum value based on the convectiondependentadsorption behavior analysis of Brilliant Green. The interaction among three different additiveswas also investigated by applying chronopotentiometry as well as Brilliant Green compete to absorbon the cathode surface with SPS. Besides, the introduction of Brilliant Green can improve the transport ofcupric ions (Cu2+). The nucleation and growth of copper deposition is 3D diffusion-controlled instantaneousgrowth process at high overpotential but 3D diffusion-controlled mixing growth process at lowoverpotential. The synergistic suppressing mechanism was proposed to explain strong suppressing effectof BG on reduction of Cu2+ and the reaction pathways was studied theoretically. Copper interconnectlayer with high FP values (80.52 % to 84.38 %) was obtained with low SDT (about 28 lm) after electroplatingprocess was optimized. The surface morphology under the influence of Brilliant Green is compactand uniform and the grain size is reduced by Brilliant Green.
Jung, Jinsang,Lee, Hanlim,Kim, Young J.,Liu, Xingang,Zhang, Yuanhang,Hu, Min,Sugimoto, Nobuo American Geophysical Union 2009 Journal of geophysical research Vol.114 No.d2
<P>In order to investigate the optical properties of atmospheric aerosol in the urban area of Beijing, in situ and remote measurements of particulate pollutants were conducted at an urban site (39.98 degrees N, 116.35 degrees E, similar to 20 m above ground level) in Beijing during the Campaign of Air Quality Research in Beijing (CAREBeijing) campaign from 16 August to 10 September 2006. During the intensive measurement period, average PM2.5 mass concentration and light extinction coefficient (b(ext)) were measured to be 102.1 +/- 55.0 mu g m(-3) and 880.7 +/- 685.9 Mm(-1), respectively. Average mass scattering efficiency of PM10 and PM2.5 particle were found to be 2.5 +/- 1.1 and 3.4 +/- 1.2 m(2) g(-1), respectively. Average single scattering albedo (SSA) of dry PM10 was characterized to be 0.82 +/- 0.09. It was found that SSA decreased to lower values of similar to 0.75 during the relatively clean condition while it increased up to similar to 0.86 during polluted condition mainly owing to the increases of ammonium sulfate, ammonium nitrate, and organic mass by carbon's contributions to PM mass concentrations. Pollution episodes in Beijing were strongly related to wind speed and wind direction. Stagnant weather conditions with southerly wind and low wind speed accelerated the accumulation of the pollutants in Beijing, which led to severe haze. It has been found that high PM2.5/AOT (aerosol optical thickness) ratio of 228.2 mu g m(-3) was observed when air mass was transported from western or northern China while significantly lower PM2.5/AOT of 107.6 mu g m(-3) was observed when it was affected mostly by local air pollutants in Beijing.</P>
김철희,장임석,김정수,Fan Meng,Mizuo Kajino,Hiromasa Ueda,Yuanhang Zhang,손혜영,Youjiang He,Jun Xu,Keiichi Sato,송창근,반수진,Tatsuya Sakurai,Zhiwei Han,Lei Duan,이석조,심상규,영선우,이태영 한국기상학회 2011 Asia-Pacific Journal of Atmospheric Sciences Vol.47 No.4
Three comprehensive acid deposition models were used to simulate the sulfur concentrations over northeast Asia over the period covering entire year of 2002, and discussed the aggregated uncertainties and discrepancies of the three models. The participating models are from the countries participating in the project of Longrange Transboundary Air Pollutants in Northeast Asia (LTP): China,Japan and Korea. The Eulerian Model-3/CMAQ (by China), Regional Air Quality Model (RAQM, by Japan), and Comprehensive Acid Deposition Model (CADM, by Korea) were employed by each country with common emissions data established by the administrative agencies of China, Japan and Korea. The episodic simulation results between 1 to 15, March 2002 are also presented, during which aircraft measurements were carried out over the Yellow sea. The episodic results show both a wide short-term variability in simulations against measurements, and maximum concentration differences of 3~5 times among the three models, requiring that further attention before confidence among the three models can be claimed for short-term simulations. However, the year-long cumulative simulations showed almost the same general features, with lower aggregated uncertainties between the three models, produced by the long term integration over northeast Asia.
Jung, Jinsang,Lee, Hanlim,Kim, Young J.,Liu, Xingang,Zhang, Yuanhang,Gu, Jianwei,Fan, Shaojia Elsevier 2009 Journal of Environmental Management Vol.90 No.11
<P><B>Abstract</B></P><P>Optical and chemical aerosol measurements were obtained from 2 to 31 July 2006 at an urban site in the metropolitan area of Guangzhou (China) as part of the Program of Regional Integrated Experiment of Air Quality over Pearl River Delta (PRIDE-PRD2006) to investigate aerosol chemistry and the effect of aerosol water content on visibility impairment and radiative forcing. During the PRIDE-PRD2006 campaign, the average contributions of ammonium sulfate, organic mass by carbon (OMC), elemental carbon (EC), and sea salt (SS) to total PM<SUB>2.5</SUB> mass were measured to be 36.5%, 5.7%, 27.1%, 7.8%, and 3.7%, respectively. Compared with the clean marine period, (NH<SUB>4</SUB>)<SUB>2</SUB>SO<SUB>4</SUB>, NH<SUB>4</SUB>NO<SUB>3</SUB>, and OMC were all greatly enhanced (by up to 430%) during local haze periods via the accumulation of a secondary aerosol component. The OMC dominance increased when high levels of biomass burning influenced the measurement site while (NH<SUB>4</SUB>)<SUB>2</SUB>SO<SUB>4</SUB> and OMC did when both biomass burning and industrial emissions influenced it. The effect of aerosol water content on the total light-extinction coefficient was estimated to be 34.2%, of which 25.8% was due to aerosol water in (NH<SUB>4</SUB>)<SUB>2</SUB>SO<SUB>4</SUB>, 5.1% that in NH<SUB>4</SUB>NO<SUB>3</SUB>, and 3.3% that in SS. The average mass-scattering efficiency (MSE) of PM<SUB>10</SUB> particles was determined to be 2.2±0.6 and 4.6±1.7m<SUP>2</SUP>g<SUP>−1</SUP> under dry (RH<40%) and ambient conditions, respectively. The average single-scattering albedo (SSA) was 0.80±0.08 and 0.90±0.04 under dry and ambient conditions, respectively. Not only are the extinction and scattering coefficients greatly enhanced by aerosol water content, but MSE and SSA are also highly sensitive. It can be concluded that sulfate and carbonaceous aerosol, as well as aerosol water content, play important roles in the processes that determine visibility impairment and radiative forcing in the ambient atmosphere of the Guangzhou urban area.</P>