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Gaseous products of aqueous N,N-dimethyl hydroxylamine degraded by radiation
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作者 WANG Jinhua LI Chun +5 位作者 WU Minghong XU Gang BAO Borong ZHENG Weifang HE Hui ZHANG Shengdong 《Nuclear Science and Techniques》 SCIE CAS CSCD 2010年第4期233-236,共4页
In this work,the 0.1-0.5 mol·L-1 N,N-dimethylhydroxylamine(DMHA) were irradiated to 5-25 kGy,and gaseous products of mainly hydrogen,methane,ethane and n-butane were measured by gas chromatography.The results sho... In this work,the 0.1-0.5 mol·L-1 N,N-dimethylhydroxylamine(DMHA) were irradiated to 5-25 kGy,and gaseous products of mainly hydrogen,methane,ethane and n-butane were measured by gas chromatography.The results show that the volume fraction of hydrogen and methane increases with the concentration of DMHA and dose,and the latter does not change markedly at high doses. 展开更多
关键词 二甲基 气态产物 辐射降解 羟胺 气相色谱法 丁烷气体 体积分数
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Qualitative and quantitative analysis of hydrogen and carbon monoxide produced by radiation degradation of N, N-dimethyl hydroxylamine
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作者 WANGJinhua BAOBorong +4 位作者 WUMinghong SUNXilian ZHANGXianye HUJingxin YEGuoan 《辐射研究与辐射工艺学报》 CAS CSCD 北大核心 2005年第2期110-110,共1页
关键词 辐射衰退 一氧化碳 气相色谱 二甲基羟胺
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Synthesis and kinetics of 2,5-dicyanofuran in the presence of hydroxylamine ionic liquid salts 被引量:2
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作者 Xuan Gao Zhihui Li +2 位作者 Dongsheng Zhang Xinqiang Zhao Yanji Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第1期310-316,共7页
2,5-Dicyanofuran(DCF)is an important biomass-derived platform compound primarily used to prepare bio-based adiponitrile,which is the key precursor for the synthesis of nylon 66 and 1,6-hexanediisocyanate(HDI).In this ... 2,5-Dicyanofuran(DCF)is an important biomass-derived platform compound primarily used to prepare bio-based adiponitrile,which is the key precursor for the synthesis of nylon 66 and 1,6-hexanediisocyanate(HDI).In this study,one-pot,green and safe synthesis of DCF from 2,5-diformylfuran(DFF)and hydroxylamine ionic liquid salts was proposed.Eco-friendly hydroxylamine ionic liquid salts were used as the nitrogen source.Ionic liquid exhibited three-fold function of cosolvent,catalysis and phase separation.The conversion of DFF and yield of DCF reached 100%under the following optimum reaction conditions:temperature of 120℃ for 70 min,volume ratio of paraxylene:[HSO_(3)-b-Py]HSO4 of 2:1,and molar ratio of DFF:(NH_(2)OH)_(2)[HSO_(3)-b-Py]HSO4 of 1:1.5.The reaction mechanism for the synthesis of DCF was proposed,and the kinetic model was established.The reaction order with respect to DFF and intermediate product 2,5-diformylfuran dioxime(DFFD)was 1.06 and 0.16,and the reaction activation energy was 64.07 kJ·mol^(-1) and 59.37 kJ·mol^(-1) respectively.After the reaction,the ionic liquid was easy to separate,recover and recycle. 展开更多
关键词 2 5-Dicyanofuran hydroxylamine ionic liquid salts Green synthesis KINETICS
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Effects of Hydroxylamine Sulfate and Sodium Nitrite on Microstructure and Friction Behavior of Zinc Phosphating Coating on High Carbon Steel 被引量:1
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作者 许育东 齐三 +5 位作者 王雷 石敏 丁宁 庞志成 汪泉 彭旭东 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2015年第2期197-202,I0002,共7页
Hydroxylamine sulfate (HAS) and sodium nitrite are used as the accelerators for zinc phos- phate coating on high carbon steel. Phase evolution of phosphate coating was investigated by X-ray diffraction. It is found ... Hydroxylamine sulfate (HAS) and sodium nitrite are used as the accelerators for zinc phos- phate coating on high carbon steel. Phase evolution of phosphate coating was investigated by X-ray diffraction. It is found that the phosphating coatings are mainly composed of hopeite Zn3Fe(PO4)2.4H2O and phosphophyllite Zn2Fe(PO4)2.4H2O. The microstructural changes of the phosphate coating, as a function of phosphating time, were evaluated by scanning elec- tron microscopy. Four-ball friction experiments reveal that hydroxylamine sulfate instead of sodium nitrite can effectively reduce the friction coefficient of lubricated phosphating coat- ing. Therefore, it may be expected that HAS will be widely used as a fast and ECO-friendly accelerator in phosphate industry. 展开更多
关键词 hydroxylamine sulfate ACCELERATOR Phosphate coating FRICTION
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Purification and Characterization of a Low-temperature Hydroxylamine Oxidase from Heterotrophic Nitrifier Acinetobacter sp.Y16 被引量:6
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作者 ZHANG Shu Mei LI Wei Guang +3 位作者 ZHANG Duo Ying HUANG Xiao Fei QIN Wen SHA Chang Qing 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2014年第7期515-522,共8页
Objective To purify a low-temperature hydroxylamine oxidase (HAO) from a heterotrophic nitrifying bacterium Acinetobacter sp. Y26 and investigate the enzyme property. Methods A HAO was purified by an anion-exchange ... Objective To purify a low-temperature hydroxylamine oxidase (HAO) from a heterotrophic nitrifying bacterium Acinetobacter sp. Y26 and investigate the enzyme property. Methods A HAO was purified by an anion-exchange and gel-filtration chromatography from strain Y16. The purity and molecular mass were determined by RP-HPLC and SDS-PAGE. The HAO activity was detected by monitoring the reduction of potassium ferricyanide using hydroxylamine as substrate and ferricyanide as electron acceptor. The partial amino acid sequence was determined by mass spectrometry. Results The low-temperature HAO with a molecular mass of 61 kDa was purified from strain Y26 by an anion-exchange and gel-filtration chromatography. The enzyme exhibited an ability to oxidize hydroxylamine in wide temperature range (4-40 ℃) in vitro using hydroxylamine as substrate and ferricyanide as electron acceptor. It was stable in the temperature range of 4 to 25 ℃ and pH range of 6.0 to 8.5 with less than 30% change in its activity. The optimal temperature and pH were 15 ℃ and 7.5, respectively. Three peptides were determined by mass spectrometry which were shown to be not identical to other reported HAOs. Conclusion This is the first study to purify a low-temperature HAO from a heterotrophic nitrifier Acinetobecter sp. It differs from other reported HAOs in molecular mass and enzyme properties. The findings of the present study have suggested that the strain Y26 passes through a hydroxylamine-oxidizing process catalyzed by a low-temperature HAO for ammonium removal. 展开更多
关键词 hydroxylamine oxidase PURIFICATION Heterotrophic nitrifier Acinetobacter sp Y16
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New Di-(p-hydroxybenzyl) A Hydroxylamine from Gastrodia eleta Bl 被引量:6
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作者 Xiao Yan HAO Ning Hua TAN Jun ZHOU(Department of Medicinal Chemistry Guiyang Medical Guiyan Guizhou 530004 Laboratory of Phytochemistry Kuming Institute of Botany Chinese Aademy of Sciences.Heilongtan Kunming.Yunnan 650204) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第6期467-468,共2页
It is the first reported that a new nitrogen-containing non-amino acid type organiccomponent 1 isolated from one of the well known traditional chinese herb medicines. Gastrodiaelela BI. Structure elucidation and unamb... It is the first reported that a new nitrogen-containing non-amino acid type organiccomponent 1 isolated from one of the well known traditional chinese herb medicines. Gastrodiaelela BI. Structure elucidation and unambiguous NMR assignments for the title compound werecarried out mainly Oil the basis of' 1D and 2D NMR experiments. 展开更多
关键词 Gastrodia eleta Bl di-(p-hydroxybenzzy ) hydroxylamine ID NMR 2D NMR
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Chemiluminescence Sensor for the Determination of Hydroxylamine by Electrostatically Immobilizing Luminol and Periodate 被引量:1
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作者 ZHANG Si chun ZHOU Guo jun JU Huang xian 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2003年第2期155-159,共5页
A novel chemiluminescence(CL) sensor, which can be used for hydroxylamine determination in combination with flow injection analysis, was developed by electrostatically immobilizing luminol and periodate on anion exch... A novel chemiluminescence(CL) sensor, which can be used for hydroxylamine determination in combination with flow injection analysis, was developed by electrostatically immobilizing luminol and periodate on anion exchange resin respectively. Hydroxylamine was sensed by its enhancing effect on the weak CL reaction between luminol and periodate, which were eluted from the ion exchange column. The response of the sensor to hydroxylamine was linear in the concentration range of 8.0×10^(-8)-2.0×10^(-6)mol/L with a detection limit of 4.0×10^(-8)mol/L hydroxylamine(3σ).The relative standard deviation(RSD) was 2.0% for 9 repetitive determinations at a hydroxylamine concentration of 5.0×10^(-7) mol/L. The sensor could be reused for over 400 times with a good reproducibility and was used to determine hydroxylamine in wastewater. 展开更多
关键词 Chemical sensor CHEMILUMINESCENCE LUMINOL PERIODATE hydroxylamine
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Study on the Inert Coordination Compound in the System of“Molybdenum(Ⅵ)—TAE—Hydroxylamine”and its Analytical Application
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作者 Chen Huaxu Shao Guangdi Department of Chemistry,University of Science and Technology BeijingBai Linshan Department of Chemical Engineering,East China Institute of Metallurgy 《Rare Metals》 SCIE EI CAS CSCD 1989年第2期58-63,共6页
In the presence of ethyl alcohol or emulsifier OP,molybdenum(Ⅵ) forms 1∶1∶1'water soluble colored coordination com- pound with both of 2-(2-thiazolylazo)-5-diethylaminophenol (abbreviation TAE) and hydroxylamin... In the presence of ethyl alcohol or emulsifier OP,molybdenum(Ⅵ) forms 1∶1∶1'water soluble colored coordination com- pound with both of 2-(2-thiazolylazo)-5-diethylaminophenol (abbreviation TAE) and hydroxylamine.This deep blue coordination compound is inert characteristically and remains stable in 1.7 mol/L sulfuric acid,2.4 mol/L hydrochloric or ni- tric acid.It will not be decomposed by masking agents even on boiled,while in that case,almost all the colored coordination com- pounds formed by other metal ions will be decomposed completely.This inert character of the coordination compound of molybdenum(Ⅵ) and its utilization in improving the analytical selectivity have been discussed.In the coexistence of various for- eign ions,especially in the presence of a great quantity of tungsten,which always interferes with the determination of molybdenum,the direct determination of molybdenum in the aqueous solution by applying this system has shown an acceptable sensitivity and reproducibility.From the results of determination in some synthetic and standard samples,it seems feasible to use this system in the determination of molybdenum in nonferrous alloys. 展开更多
关键词 and its Analytical Application Molybdenum hydroxylamine Study on the Inert Coordination Compound in the System of TAE
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Studies on the Reaction of Vinyl Triazole Derivatives with Hydroxylamine
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作者 Gui Yu JIN Guo Feng ZHAO +2 位作者 Zhong Fa LIU Jin REN Yu Chang LI (Institute of Elemento-Organic Chemistry, National Key Laboratory of Elemento-Organic Chemistry.Nankai University, Tianjin 30007) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第6期467-470,共4页
In this paper the reaction of vinyl triazole derivatives with hydroxylamine hydrochloride under the action of sodium carbonate was studied. The result indicated that cyclization took place and new heterocyclic compoun... In this paper the reaction of vinyl triazole derivatives with hydroxylamine hydrochloride under the action of sodium carbonate was studied. The result indicated that cyclization took place and new heterocyclic compounds of 1,2-oxazocyclopentanes were obtained. 展开更多
关键词 PPM OH NH Studies on the Reaction of Vinyl Triazole Derivatives with hydroxylamine Ph IR
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甲氧胺盐酸盐的合成工艺
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作者 杨士伟 朱金苗 +3 位作者 郑斌 王小红 毕文杰 张雪燕 《精细石油化工》 CAS 2024年第6期56-59,共4页
报道了以盐酸羟胺为原料的甲氧胺盐酸盐合成新工艺。优化合成工艺条件为:1)盐酸羟胺用量20 g,n(盐酸羟胺)∶n(碳酸钾)=2∶1,V(乙酸乙酯)=150 mL,V(50%乙醇)=150 mL,反应温度80℃,反应时间5.0 h,得到乙酰羟胺(Ⅰ);2)n(化合物Ⅰ)∶n(硫酸... 报道了以盐酸羟胺为原料的甲氧胺盐酸盐合成新工艺。优化合成工艺条件为:1)盐酸羟胺用量20 g,n(盐酸羟胺)∶n(碳酸钾)=2∶1,V(乙酸乙酯)=150 mL,V(50%乙醇)=150 mL,反应温度80℃,反应时间5.0 h,得到乙酰羟胺(Ⅰ);2)n(化合物Ⅰ)∶n(硫酸二甲酯)=1.68∶1,反应温度0~25℃,反应时间4.0 h,150 mL 50%NaOH-乙醇溶液,得到乙酰甲氧胺(Ⅱ);3)以水为溶剂,n(化合物Ⅱ)=0.5612 mol,V(H_(2)SO_(4))=50 mL,反应温度70℃,反应时间4.0 h,得到甲氧胺盐酸盐。三步反应的总收率为74.47%。 展开更多
关键词 盐酸羟胺 硫酸二甲酯 甲氧胺盐酸盐 乙酰甲氧胺 循环套用
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硝酸羟胺基液体推进剂的热安全性研究
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作者 康立敏 徐森 +3 位作者 朱晨光 徐飞扬 刘静平 邵星宇 《爆破器材》 CAS CSCD 北大核心 2024年第4期1-8,共8页
为了评估硝酸羟胺(HAN)基液体推进剂在生产、储存、运输以及使用过程中的安全性,利用差式扫描量热仪DSC测试了热分解过程,计算了热安全参数;并利用BAM撞击感度仪测试了撞击能量随温度的变化。结果显示:K-A-S法、F-W-O法和Starink法计算... 为了评估硝酸羟胺(HAN)基液体推进剂在生产、储存、运输以及使用过程中的安全性,利用差式扫描量热仪DSC测试了热分解过程,计算了热安全参数;并利用BAM撞击感度仪测试了撞击能量随温度的变化。结果显示:K-A-S法、F-W-O法和Starink法计算得到的表观活化能分别为154.8、154.6、155.6 kJ/mol;热分解自由能、活化焓和活化熵分别为128.2、150.9 kJ/mol和48.9 J/mol;热爆炸临界温度为204.2℃;绝热至爆时间为3.92~55.52 s。使用AKTS软件得到,2、4、8 h和24 h绝热诱导期对应的温度分别为123.4、119.1、114.8℃和108.2℃。包装质量为0.01、5.00、25.00、50.00 kg和100.00 kg时,自加速分解温度依次为116、104、103、102℃和101℃。不同温度下,临界撞击能量分别为>50(25℃)、40(80℃)、25(90℃)、10 J(100℃)和5 J(110℃)。因此,在生产、储存和运输HAN基液体推进剂的过程中需要避免因碰撞等原因产生高温。 展开更多
关键词 硝酸羟胺(HAN) 热安全性 撞击能量 DSC BAM
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HAN基ECSP凝胶模型的构建与分子动力学模拟 被引量:2
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作者 李门 李天鹏 +2 位作者 郭爱强 刘建国 高欣宝 《装备环境工程》 CAS 2024年第2期28-36,共9页
目的从微观分子的角度对硝酸羟胺(HAN)基电控固体推进剂(Electrically Controlled Solid Propellants,ECSP)的性能参数进行模拟与计算。方法利用分子表面静电势(ESP)对HAN分子2种可能的构型进行优化和稳定性分析。通过真空非周期性分子... 目的从微观分子的角度对硝酸羟胺(HAN)基电控固体推进剂(Electrically Controlled Solid Propellants,ECSP)的性能参数进行模拟与计算。方法利用分子表面静电势(ESP)对HAN分子2种可能的构型进行优化和稳定性分析。通过真空非周期性分子动力学模拟得到聚乙烯醇(PVA)分子稳定构型,并以HAN基ECSP的主要成分按一定比例构建凝胶模型。基于RESP(Restrained Electrostatic Potential)电荷生成更准确的凝胶模型拓扑文件,并进行凝胶模型的分子动力学模拟、模型稳定分析以及模型参数计算。结果凝胶模型总能量相对平均值的周期性波动不超过7%。由于三维PVA链的包裹,H_(2)O分子的扩散系数被大幅削弱。氢键分析和径向分布函数表明氢键键长主要分布在0.2826 nm附近,PVA与H_(2)O间的氢键较少,H_(2)O与HAN、H_(2)O与H_(2)O之间的氢键较多。模型密度为1.405 g/cm^(3),与实验值吻合度高。在283、293、303 K下,HAN基ECSP凝胶模型的拉伸模量依次降低,剪切模量先增后减。在15 K/600 ps冷却速率下,HAN基ECSP凝胶模型的拉伸模量和剪切模量均增大。结论ECSP制备结束后,冷却过程中的环境温度不宜过高,否则容易造成ECSP力学性能的快速下降,快速冷却可以提高ECSP的力学性能。 展开更多
关键词 电控固体推进剂 硝酸羟胺 聚乙烯醇 凝胶模型 分子动力学模拟 力学性能 静电势
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双功能型羟胺类抗氧剂的进展
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作者 李林 张娜 +2 位作者 邹子墨 段百超 王俊 《塑料》 CAS CSCD 北大核心 2024年第1期130-137,共8页
抗氧剂是聚合物材料中应用最广泛的助剂之一,羟胺类抗氧剂同时具有捕获自由基和分解氢过氧化物的功能,其作为一种双功能型抗氧剂,在聚合物材料的加工和使用过程中已经得到了应用。简述了羟胺类抗氧剂的结构,详细介绍了羟胺类抗氧剂抗氧... 抗氧剂是聚合物材料中应用最广泛的助剂之一,羟胺类抗氧剂同时具有捕获自由基和分解氢过氧化物的功能,其作为一种双功能型抗氧剂,在聚合物材料的加工和使用过程中已经得到了应用。简述了羟胺类抗氧剂的结构,详细介绍了羟胺类抗氧剂抗氧化作用的机理,在结构和作用机理的基础上对影响该类抗氧剂抗氧化效率的因素进行分析,着重阐述了次级氮氧自由基、取代基及取代烷基链长度对其抗氧化效率的影响。此外,介绍了常用羟胺类抗氧剂(烷基羟胺类、苄基羟胺类以及环状羟胺类等)的开发应用现状。最后,提出羟胺类抗氧剂未来的发展方向应致力于优化合成工艺,开发多元复配体系和多功能型羟胺类抗氧剂,实现抗氧剂的高效利用。 展开更多
关键词 抗氧剂 羟胺类抗氧剂 抗氧化效率 聚合物材料 双功能型抗氧剂
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不同组份下硝酸羟胺基液体推进剂电点火及稳定燃烧
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作者 金宝志 申连华 +2 位作者 李国岫 李洪萌 鲍世国 《火箭推进》 CAS 北大核心 2024年第5期96-105,共10页
为避免硝酸羟胺(HAN)基液体推进剂传统催化点火的延迟时间长、催化剂失活等缺点,同时充分发挥HAN基液体推进剂高能量密度、高比冲等优点,设计并搭建了HAN基液体推进剂静置状态和流动状态下电点火实验系统。制备了4种新型高能HAN基液体... 为避免硝酸羟胺(HAN)基液体推进剂传统催化点火的延迟时间长、催化剂失活等缺点,同时充分发挥HAN基液体推进剂高能量密度、高比冲等优点,设计并搭建了HAN基液体推进剂静置状态和流动状态下电点火实验系统。制备了4种新型高能HAN基液体推进剂,并开展了静置状态和流动状态下电点火及稳定燃烧实验研究,对比了不同组份下HAN基液体推进剂点火及稳定燃烧的影响。甲醇的添加抑制了推进剂的活性,推进剂分解过程变得缓慢且没有观察到持续稳定燃烧的火焰。掺混15%乙腈的推进剂在火焰高度和点火延迟时间等方面都表现出优异性能,流动状态下在关闭加载电压后能通过自分解维持火焰的燃烧。 展开更多
关键词 空间发动机 硝酸羟胺基液体推进剂 电点火 甲醇 乙腈
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羟胺强化Fe(Ⅲ)-NTA络合物活化过二硫酸盐降解磺胺甲恶唑 被引量:3
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作者 王真然 彭藴斓 +1 位作者 刘义青 付永胜 《安全与环境学报》 CAS CSCD 北大核心 2024年第3期1163-1172,共10页
针对Fe(Ⅱ)/过二硫酸盐(Peroxydisulfate,PDS)高级氧化技术存在的pH值应用范围窄、铁泥产量大等缺陷,研究构建Fe(Ⅲ)-氨三乙酸(Nitrilotriacetic Acid,NTA)/羟胺(Hydroxylamine,HAm)/PDS体系,以在中性条件下高效降解水中新污染物磺胺甲... 针对Fe(Ⅱ)/过二硫酸盐(Peroxydisulfate,PDS)高级氧化技术存在的pH值应用范围窄、铁泥产量大等缺陷,研究构建Fe(Ⅲ)-氨三乙酸(Nitrilotriacetic Acid,NTA)/羟胺(Hydroxylamine,HAm)/PDS体系,以在中性条件下高效降解水中新污染物磺胺甲恶唑(Sulfamethoxazole,SMX)。研究结果显示,Fe(Ⅲ)-NTA/HAm/PDS体系在pH=7条件下对SMX的降解率可达91%,该体系降解SMX的主要活性物种为·SO_(4)^(-)和·OH。SMX在Fe(Ⅲ)-NTA/HAm/PDS体系中的降解效率随溶液pH值的升高而降低,且增加Fe(Ⅲ)、PDS的用量会加速SMX降解。NTA的引入可将Fe(Ⅱ)/PDS体系的pH值应用范围由酸性拓展至弱碱性,与此同时,向体系内加入HAm可有效减少铁泥的产量。根据检测到的降解产物,提出SMX在Fe(Ⅲ)-NTA/HAm/PDS体系中可能的降解途径包括断键反应、羟基化反应、氨基氧化反应。双酚AF、双氯芬酸、土霉素等其他新污染物也能在Fe(Ⅲ)-NTA/HAm/PDS体系中被高效去除,表明该体系在新污染物的降解领域有较大的应用潜力。 展开更多
关键词 环境工程学 磺胺甲恶唑 羟胺 Fe(Ⅲ)-NTA络合物 过二硫酸盐
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硝酸羟胺基固体推进剂电控燃烧特性实验研究
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作者 胡泽君 吴建军 +3 位作者 欧阳 何志成 张宇 彭琴惠 《宇航学报》 EI CAS CSCD 北大核心 2024年第7期1040-1051,共12页
硝酸羟胺基固体推进剂以硝酸羟胺(HAN)为氧化剂,聚乙烯醇(PVA)为粘合剂,具有可电控燃烧、产气无毒害、能量特性好的特点,然而工作性能不稳定、点火机理不明朗的问题是限制其工程实际应用的主要因素之一。针对以上问题,制备了不同成分配... 硝酸羟胺基固体推进剂以硝酸羟胺(HAN)为氧化剂,聚乙烯醇(PVA)为粘合剂,具有可电控燃烧、产气无毒害、能量特性好的特点,然而工作性能不稳定、点火机理不明朗的问题是限制其工程实际应用的主要因素之一。针对以上问题,制备了不同成分配比的推进剂,利用扫描电镜能谱仪和电化学工作站对推进剂的微观形貌、元素分布和电导率进行分析,然后对推进剂的点火功率、推进剂温度、火焰结构、熄灭特性进行实验研究并优选了最佳成分配比。实验结果表明,推进剂中PVA的含量越高,PVA分子链交联形成的骨架结构越紧密,造成推进剂的电导率更低,所需的点火功率更高,燃烧过程中推进剂表面温度也会更高,熄灭后推进剂的自分解会更剧烈,不利于推进剂的高效燃烧和重复点火。PVA的最佳质量分数为18%。另外,电化学阻抗是影响推进剂电能注入的重要因素,PVA含量过低会导致电能难以注入,使得推进剂表面无法达到点火温度。 展开更多
关键词 固体推进剂 硝酸羟胺 配方优化 电控燃烧 点火燃烧特性
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羟胺强化Cu(Ⅱ)活化过氧乙酸降解有机染料
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作者 欧杰丽 刘义青 +1 位作者 唐钰琦 付永胜 《中国环境科学》 EI CAS CSCD 北大核心 2024年第10期5547-5555,共9页
采用盐酸羟胺(HA)强化Cu(Ⅱ)活化过氧乙酸(PAA)降解亚甲基蓝(MB),考察了溶液初始pH值、反应物投加量及水环境中常见阴离子、天然有机物对HA/Cu(Ⅱ)/PAA体系去除MB效果的影响;通过鉴别体系中的主要活性物质,探究PAA在HA/Cu(Ⅱ)/PAA体系... 采用盐酸羟胺(HA)强化Cu(Ⅱ)活化过氧乙酸(PAA)降解亚甲基蓝(MB),考察了溶液初始pH值、反应物投加量及水环境中常见阴离子、天然有机物对HA/Cu(Ⅱ)/PAA体系去除MB效果的影响;通过鉴别体系中的主要活性物质,探究PAA在HA/Cu(Ⅱ)/PAA体系中的活化机理.结果表明:pH值为7.0条件下,当Cu(Ⅱ)和PAA投加量均为200μmol/L时,向Cu(Ⅱ)/PAA体系中加入400μmol/L的HA,经过30min的反应,MB的去除率可由14.7%增加到74.1%,降解速率由0.0047min^(-1)提高至0.2271min^(-1);HA的引入推动了Cu(Ⅱ)向Cu(Ⅰ)的转化,促进了PAA的催化分解,导致体系中生成更多的活性物种.基于自由基淬灭实验结果,羟基自由基(HO•)主导了MB的氧化降解.溶液pH值对MB降解影响较大,中性和弱碱性环境更有利于HA/Cu(Ⅱ)/PAA体系对MB的降解.共存Cl^(-)和HCO_(3)^(-)会抑制MB降解,而天然有机质对MB降解起一定促进作用. 展开更多
关键词 过氧乙酸 Cu(Ⅱ) 盐酸羟胺 高级氧化 亚甲基蓝
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HA/H_(2)O_(2)体系对磺胺噻唑降解的机理与效能
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作者 武玮 郑伟杰 +3 位作者 许荣刚 罗从伟 任会学 陈飞勇 《净水技术》 CAS 2024年第6期95-105,共11页
以盐酸羟胺/过氧化氢(HA/H_(2)O_(2))作为研究体系,考察其对于磺胺噻唑(STZ)的降解效能。文章考察了HA初始浓度、H_(2)O_(2)初始浓度、STZ初始浓度、pH、天然有机物(NOM)、阴离子(SO_(4)^(2-)、Cl-和NO_(3)^(-))对STZ降解的影响。结果表... 以盐酸羟胺/过氧化氢(HA/H_(2)O_(2))作为研究体系,考察其对于磺胺噻唑(STZ)的降解效能。文章考察了HA初始浓度、H_(2)O_(2)初始浓度、STZ初始浓度、pH、天然有机物(NOM)、阴离子(SO_(4)^(2-)、Cl-和NO_(3)^(-))对STZ降解的影响。结果表明:在pH值=3.0的条件下,HA/H_(2)O_(2)体系对STZ具有高效的降解效果,当HA的物质的量浓度由2 mmol/L增加到10 mmol/L时,对STZ的去除率从56.06%增加到85.26%;当H_(2)O_(2)的物质的量浓度从2 mmol/L增加到10 mmol/L时,对STZ的去除率从58.96%增加到85.26%,当STZ的物质的量浓度从2μmol/L增加到10μmol/L时,对STZ的去除率从98.72%降低到71.86%。随着pH的增大,STZ的去除率逐渐降低,在pH值>7的条件下对STZ的去除率可以忽略不计。向反应体系中分别投加5 mmol/L的SO_(4)^(2-)和5 mmol/L的NO_(3)^(-)都可以有效促进STZ的降解,而5 mmol/L的Cl^(-)则会抑制STZ的降解。当向体系中投加小于5 mg/L的NOM则对STZ的降解的影响可以忽略不计。测定了体系中共有17种降解产物,并推测STZ通过取代反应、羟基化反应等方式逐步被降解。通过明亮发光杆菌发光值变化分析降解过程中溶液毒性的变化,测定发现STZ降解过程中急性毒性不高。实际水体试验结果表明,HA/H_(2)O_(2)系统对二级出水中的荧光类物质具有较好的降解效果。 展开更多
关键词 盐酸羟胺/过氧化氢(HA/H_(2)O_(2)) 磺胺噻唑(STZ) 氧化降解 产物分析 急性毒性
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4,4-二甲基异噁唑-3-酮的合成研究
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作者 谢耀濂 唐依萍 +2 位作者 刘英 李致宝 郭洋洋 《云南化工》 CAS 2024年第11期42-45,共4页
为了提高4,4-二甲基异噁唑-3-酮的产率,节约实验成本,在前人所研究的基础上,探讨其更为优质的实验合成方法。以氯代特戊酰氯和盐酸羟胺为起始原料,水为溶剂,NaOH为缚酸剂,经过肟化、环合反应生成4,4-二甲基异噁唑-3-酮,采用正交实验法... 为了提高4,4-二甲基异噁唑-3-酮的产率,节约实验成本,在前人所研究的基础上,探讨其更为优质的实验合成方法。以氯代特戊酰氯和盐酸羟胺为起始原料,水为溶剂,NaOH为缚酸剂,经过肟化、环合反应生成4,4-二甲基异噁唑-3-酮,采用正交实验法对反应物投料比、反应时间、缚酸剂浓度、反应温度等各方面合成条件进行优化。结果表明,肟化反应在0~15℃的温度下进行,可抑制盐酸羟胺与氯代特戊酰氯的分解,反应投料比为1∶1.3,氢氧化钠质量分数为30%,反应时间为3 h,成环反应进行18~20 h,收率为64.84%。 展开更多
关键词 4 4-二甲基异噁唑-3-酮 氯代特戊酰氯 盐酸羟胺 肟化反应 环合反应
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Feasibility of low-intensity ultrasound treatment with hydroxylamine to accelerate the initiation of partial nitrification and allow operation under intermittent aeration
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作者 Jianxiong Jian Xiaojian Liao +7 位作者 Zhihua Mo Shoupeng Li Lei Li Shaojin Chen Zhenhua Huang Junhao Chen Wencan Dai Shuiyu Sun 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第5期446-459,共14页
Partial nitrification is a key aspect of efficient nitrogen removal,although practically it suf-fers from long start-up cycles and unstable long-term operational performance.To address these drawbacks,this study inves... Partial nitrification is a key aspect of efficient nitrogen removal,although practically it suf-fers from long start-up cycles and unstable long-term operational performance.To address these drawbacks,this study investigated the effect of low intensity ultrasound treatment combined with hydroxylamine(NH2OH)on the performance of partial nitrification.Results showthat compared with the control group,low-intensity ultrasound treatment(0.10W/mL,15 min)combined with NH2OH(5 mg/L)reduced the time required for partial nitrification initiation by 6 days,increasing the nitrite accumulation rate(NAR)and ammonia nitro-gen removal rate(NRR)by 20.4% and 6.7%,respectively,achieving 96.48% NRR.Mechanis-tic analysis showed that NH2OH enhanced ammonia oxidation,inhibited nitrite-oxidizing bacteria(NOB)activity and shortened the time required for partial nitrification initiation.Furthermore,ultrasonication combined with NH2OH dosing stimulated EPS(extracellular polymeric substances)secretion,increased carbonyl,hydroxyl and amine functional group abundances and enhanced mass transfer.In addition,16S rRNA gene sequencing results showed that ultrasonication-sensitive Nitrospira disappeared from the ultrasound+NH_(2)OH system,while Nitrosomonas gradually became the dominant group.Collectively,the results of this study provide valuable insight into the enhancement of partial nitrification start-up during the process of wastewater nitrogen removal. 展开更多
关键词 Partial nitrification Low-intensity ultrasound hydroxylamine Ammonia oxidizing bacteria Nitrite oxidizing bacteria
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