检索结果-南通市图书馆

Chinese Physics B 2017年第6期26卷 395-400页

作者：樊继斌刘红侠段理张研于晓晨 School of Materials Science and Engineering Chang’an University School of Microelectronics Key Laboratory of Wide Band-Gap Semiconductor Materials and DevicesXidian University

A comparative study of two kinds of oxidants（H2O and O3） with the combination of two metal precursors（TMA and La（～iPrCp）3） for atomic layer deposition（ALD） La2O3/Al2O3 nanolaminates is carried out. The effects of different oxidants on the physical properties and electrical characteristics of La2O3/Al2O3 nanolaminates are studied. Initial testing results indicate that La2O3/Al2O3 nanolaminates could avoid moisture absorption in the air after thermal annealing. However, moisture absorption occurs in H2O-based La2O3/Al2O3 nanolaminates due to the residue hydroxyl/hydrogen groups during annealing. As a result, roughness enhancement, band offset variation, low dielectric constant and poor electrical characteristics are measured because the properties of H2O-based La2O3/Al2O3 nanolaminates are deteriorated. Addition thermal annealing effects on the properties of O3-based La2O3/Al2O3 nanolaminates indicate that O3 is a more appropriate oxidant to deposit La2O3/Al2O3 nanolaminates for electron devices application.

关键词： La2O3/Al2O3 nanolaminates atomic layer deposition oxidants annealing

Rapid and long-effective removal of broad-spectrum pollutants from aqueous system by ZVI/oxidants

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2020年第5期14卷 147-156页

作者： Sana Ullah Xuejun Guo Xiaoyan Luo Xiangyuan Zhang Siwen Leng Na Ma Palwasha Faiz State Key Laboratory of Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Department of Environmental and Conservation Sciences University of SwatMingora 19200Pakistan

Zero-valent iron(ZVI)technology has recently gained significant interest in the efficient sequestration of a wide variety of ***,surface passivation of ZVI because of its intrinsic passive layer would lead to the inferior reactivity of ZVI and its lower efficacy in contaminant ***,to activate the ZVI surface cheaply,continuously,and efficiently is an important challenge that ZVI technology must overcome before its wide-scale *** date,several physical and chemical approaches have been extensively applied to increase the reactivity of the ZVI surface toward the elimination of broad-spectrum ***,these techniques have several limitations such as low efficacy,narrow working pH,eco-toxicity,and high installation *** objective of this mini-review paper is to identify the critical role of oxygen in determining the reactivity of ZVI toward contaminant ***,the effect of three typical oxidants(H2O2,KMnO4,and NaClO)on broad-spectrum contaminants removal by ZV1 has been documented and *** reaction mechanism and sequestration efficacies of the ZVI/oxidant system were evaluated and *** technical basis of the ZVI/oxidant approach is based on the half-reaction of the cathodic reduction of the *** oxidants commonly used in the water treatment industry,i.e.,NaClO,O3,and H2O2,can be served as an ideal coupling electron *** the combination of these oxidants,the surface corrosion of ZVI can be continuously *** ZVI/oxidants technology has been compared with other conventional technologies and conclusions have been drawn.

关键词： Zero-Valent Iron(ZVI) oxidants Heavy Metals(HMs) Metalloids Nitrate,Phosphate

Degradation of simulated organic wastewater by advanced oxidation with oxidants generated from oxygen reduction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第4期27卷 850-856页

作者： Yi Ouyang Qing Xu Yang Xiang Wei Liu Junqi Du Beijing Key Laboratory of Membrane Science and Technology Beijing University of Chemical Technology Beijing 100029 China School of Chemical Engineering Beijing University of Chemical Technology Beijing 100029 China

The degradation capacity of advanced oxidants generated from oxygen reduction was investigated in model effluent containing chlorobenzene, aniline and benzene through the advanced oxidation processes(AOPs). Intermediate products of the degradation process were determined by GC–MS, and they contributed to specify the degradation pathways of monoaromatic compounds. The study particularly focused on the influence of the dosage of the oxidant, pH and the initial concentration of organic compounds on the degradation *** the dosage of oxidant was 4 wt% and the pH was 7, the maximum degradation rates of 74.83% chlorobenzene, 70.32% aniline and 37.69% benzene were achieved. Furthermore, microwave was applied to intensify the oxidation process under optimal operation conditions, and the degradation rates were increased to 87.85% chlorobenzene, 89.11% aniline and 39.03% benzene, respectively.

关键词： AOPs Degradation Advanced oxidants Monoaromatic compounds Microwave

The coupling of sand with ZVI/oxidants achieved proportional and highly efficient removal of arsenic

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2020年第6期14卷 29-39页

作者： Sana Ullah Xuejun Guo Xiaoyan Luo Xiangyuan Zhang Yameng Li Ziyu Liang State Key Laboratory of Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Department of Environmental and Conservation Sciences University of Swat19200Pakistan

The coupling of zero-valent iron(ZVI)with common oxidants has recently achieved very rapid and highly efficient removal of Heavy metals from ***,the uniform activation of ZVI throughout the column and the proportional removal of target contaminants are urgently required for the prevention of premature filter clogging and the extension of the effective column operational *** this study,we successfully achieved this objective by simply doping granular sand with ZVI at appropriate weight *** pure ZVI packed column was spiked with oxidants,the majority of As trapping occurred between the column inlet and the first sampling *** a packed column with a 1:20 mixture of ZVI and sand,the average As removal efficiency was 36(1st),13.1(2nd),18.5(3rd),19.2(4th)and 5.9%(5th outlet).The overall arsenic removal performance of the composite filling system of ZVI/sand was equally as efficient as that of the previous pure ZVI-packed ***,the leaching of Fe was significantly reduced with an increased sand ratio,resulting in clearer water with less *** results of X-ray photoelectron spectroscopy(XPS)demonstrated that more than 54%of the arsenic was reduced to As(III).X-ray diffraction(XRD)and scanning electron microscopy(SEM)confirmed the extensive corrosion of the ZVI surface,which resulted in various species of iron oxyhydroxides responsible for the highly efficient sequester of arsenic through reduction,adsorption,and coprecipitation.

关键词： Arsenic ZVI Sand oxidants Fixed-bed Column Removal

The electrochemical advanced oxidation processes coupling of oxidants for organic pollutants degradation: A mini-review

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2019年第12期30卷 2139-2146页

作者： Jun Li Yangju Li Zhaokun Xiong Gang Yao Bo Lai State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China Sino-German Centre for Water and Health Research Sichuan UniversityChengdu 610065China Institute of Environmental Engineering RWTH Aachen UniversityAachen 52072Germany

The electrochemical advanced oxidation processes(EAOPs) have been extensively applied in the treatment of organic pollutants ***,the mini review provides the coupling systems about EAOPs and different oxidants(e.g.,persulfate(PS),peroxymonosulfate(PMS),and ozone(O3)),including EAOPs-PS systems,EAOPs-PMS systems,EAOPs-peroxone systems,and photoelectro-oxidants systems,for the organic compounds *** coupling system of EAOPs with oxidants is an effective way to improve the generated free radicals(e.g.,HO^·and SO4^·-) concentration and to accelerate pollutant *** this review,we make a summary of the homogeneous and heterogeneous EAOPs-oxidant *** reaction mechanisms of EAOPs combined with different oxidants are elucidated in detail,as well as the synergistic effect for improving the degradation and mineralization efficiency.

关键词： Electrochemical advanced oxidation processes Organic compounds oxidants Free radicals Reaction mechanism

Influences of different oxidants on the characteristics of HfAlO_x films deposited by atomic layer deposition

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第2期22卷 487-491页

作者：樊继斌刘红侠马飞卓青青郝跃 School of Microelectronics Key Laboratory of Wide Band-Gap Semiconductor Materials and DevicesXidian University

A comparative study of two kinds of oxidants（H2O and O3） with the combinations of two metal precursors [trimethylaluminum（TMA） and tetrakis（ethylmethylamino） hafnium（TEMAH）] for atomic layer deposition（ALD） hafnium aluminum oxide（HfAlOx） films is carried *** effects of different oxidants on the physical properties and electrical characteristics of HfAlOx films are *** preliminary testing results indicate that the impurity level of HfAlOx films grown with both H2O and O3 used as oxidants can be well controlled,which has significant effects on the dielectric constant,valence band,electrical properties,and stability of HfAlOx *** thermal annealing effects on the properties of HfAlOx films grown with different oxidants are also investigated.

关键词： HfAlOx atomic layer deposition oxidants annealing

Chemisorbed　dimethylammonium　chlorochromate　as　selective　oxidants　for　primary　and　second　aryAlcohols

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1996年第11期7卷 973-974页

作者： Zhang, GS Shi, QZ Chen, MF Cai, K HENAN NORMAL UNIV DEPT CHEMXINXIANG 453002PEOPLES R CHINA

Two new reagents. dimethylammonium chlorochromale adsrbed on alumina and silicagel are describe as convenient reagents for efficient oxidation of a variety of primary and secondaryalcohols. These two reagents are very... 详细信息

关键词： selective and aryAlcohols chlorochromate dimethylammonium oxidants primary Chemisorbed

Study of removal effect on Mesocyclops leukarti with oxidants

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第3期7卷 171-179页

作者： ZUO Jin-long CUI Fu-yi LIN Tao School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

Cyclops of zooplankton propagates prolifically in eutrophic waterbody and it cannot be exterminated by conventional disinfection process. The mutagenicity of Mesocyclops leukarti and its extermination with oxidants in a drinking waterworks in China were studied. Among five oxidants for use in bench-scale, chlorine dioxide is the most effective and the potassium per-manganate is the weakest against Mesocyclops leukarti under the same conditions. Full-scale results showed that Mesocyclops leukarti could be effectively removed from water by 1.0 mg/L chlorine dioxide preoxidation combined with conventional removal physical process. After filtration, chlorite, a by-product of prechlorine dioxide, is stable at 0.45 mg/L, which is lower than the critical value of the USEPA. GC-MS examination and Ames test further showed that the quantity of organic substance and the mutagenicity in water treated by chlorine dioxide preoxidation are obviously less than those of prechlorination.

关键词： oxidants Chlorine Chlorine dioxide Mesocyclops leukarti Preoxidation Water safety oxidants, Chlorine, Chlorine dioxide, Mesocyclops leukarti, Preoxidation, Water safety

<i>Gsta</i>4 Null Mouse Embryonic Fibroblasts Exhibit Enhanced Sensitivity to oxidants: Role of 4-Hydroxynonenal in Oxidant Toxicity

在线全文

学校读者我要写书评

暂无评论

Open Journal of Apoptosis 2013年第1期2卷 1-11页

作者： Kevin E. McElhanon Chhanda Bose Rajendra Sharma Liping Wu Yogesh C. Awasthi Sharda P. Singh Central Arkansas Veterans Healthcare System Little Rock USA Department of Molecular Biology and Immunology University of North Texas Health Science Center Fort Worth USA Department of Pharmacology and Toxicology University of Arkansas for Medical Sciences Little Rock USA

The alpha class glutathione s-transferase (GST) isozyme GSTA4-4 (EC2.***.1.18) exhibits high catalytic efficiency towards 4-hydroxynon-2-enal (4-HNE), a major end product of oxidative stress induced lipid peroxidation. Exposure of cells and tissues to heat, radiation, and chemicals has been shown to induce oxidative stress resulting in elevated concentrations of 4-HNE that can be detrimental to cell survival. Alternatively, at physiological levels 4-HNE acts as a signaling molecule conveying the occurrence of oxidative events initiating the activation of adaptive pathways. To examine the impact of oxidative/electrophilic stress in a model with impaired 4-HNE metabolizing capability, we disrupted the Gsta4 gene that encodes GSTA4-4 inmice. The effect of electrophile and oxidants on embryonic fibroblasts (MEF) isolated from wild type (WT) and Gsta4 null mice were examined. Results indicate that in the absence of GSTA4-4, oxidant-induced toxicity is potentiated and correlates with elevated accumulation of 4-HNE adducts and DNA damage. Treatment of Gsta4 null MEF with 1,1,4-tris(acetyloxy)-2(E)-nonene [4-HNE(Ac)3], a pro-drug form of 4-HNE, resulted in the activation and phosphorylation of the c-jun-N-terminal kinase (JNK), extracellular-signal-regulated kinases (ERK 1/2) and p38 mitogen activated protein kinases (p38 MAPK) accompanied by enhanced cleavage of caspase-3. Interestingly, when recombinant mammalian or invertebrate GSTs were delivered to Gsta4 null MEF, activation of stress-related kinases in 4-HNE(Ac)3 treated Gsta4 null MEF were inversely correlated with the catalytic efficiency of delivered GSTs towards 4-HNE. Our data suggest that GSTA4-4 plays a major role in protecting cells from the toxic effects of oxidant chemicals by attenuating the accumulation of 4-HNE.

关键词： Glutathione Transferase Protein Adducts Lipid Peroxidation oxidants Stress Kinases

Use of ionic liquid in leaching process of brass wastes for copper and zinc recovery

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2014年第2期21卷 138-143页

作者： Ayfer Kilicarslan Muhlis Nezihi Saridede Srecko Stopic Bernd Friedrich Department of Metallurgical and Materials Engineering (Davutpasa Campus) Yildiz Technical University Department of Process Metallurgy and Metal Recycling (IME) RWTH Aachen University

Brass ash from the industrial brass manufacturer in Turkey was leached using the solutions of ionic liquid （IL） 1-butyl-3-methyl-imi-dazolium hydrogen sulfate （[bmim]HSO4） at ambient pressure in the presence of hydrogen peroxide （H2O2） and potassium peroxymonosulfate （oxone） as the oxidants. Parameters affecting leaching efficiency, such as dissolution time, IL concentration, and oxidizing agent addition, were investigated. The results show that [bmim]HSO4 is an efficient IL for the brass ash leaching, providing the dissolution efficiencies of 99%for Zn and 24.82%for Cu at a concentration of 50vol%[bmim]HSO4 in the aqueous solution without any oxidant. However, more than 99%of zinc and 82%of copper are leached by the addition of 50vol%H2O2 to the [bmim]HSO4 solution. Nevertheless, the oxone does not show the promising oxidant behavior in leaching using [bmim]HSO4.

关键词： leaching recovery copper zinc ionic liquids oxidants