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Formation of halonitromethanes from methylamine in the presence of bromide during UV/Cl2 disinfection

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Journal of Environmental Sciences 2022年第7期34卷 28-36页

作者： Lin Deng Wei Luo Xiao Chi Tingting Huang Longjia Wen Huiyu Dong Mingxian Wu Jun Hu Department of Municipal Engineering Southeast UniversityNanjing 211189China Zhejiang Haihe Environmental Technology Co. Ltd.Jinhua 321000China Research Center for Eco-Environmental Sciences University of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100085China Zhejiang Truelove Blanket Technology Co. Ltd.Jinhua 322000China College of Environment Zhejiang University of TechnologyHangzhou 310014China

The UV/Clprocess is commonly used to achieve a multiple-barrier disinfection and maintain residuals. The study chose methylamine as a precursor to study the formation of hightoxic halonitromethanes(HNMs) in the presence of bromide ions(Br-) during UV/Cldisinfection. The maximum yield of HNMs increased first and then decreased with increasing concentration of Br-. An excessively high concentration of Br-induced the maximum yield of HNMs in advance. The maximum bromine incorporation factor(BIF) increased, while the maximum bromine utilization factor(BUF) decreased with the increase of Br-concentration. The maximum yield of HNMs decreased as p H value increased from 6.0 to 8.0 due to the deprotonation process. The BUF value remained relatively higher under an acidic condition, while p H value had no evident influence on the BIF value. The maximum yield of HNMs and value of BUF maximized at a Cl:Br-ratio of 12.5, whereas the BIF value remained relatively higher at low Cl:Br-ratios(2.5 and 5). The amino group in methylamine was first halogenated, and then released into solution as inorganic nitrogen by the rupture of C-N bond or transformed to nitro group by oxidation and elimination pathways. The maximum yield of HNMs in real waters was higher than that in pure water due to the high content of dissolved organic carbon. Two real waters were sampled to verify the law of HNMs formation. This study helps to understand the HNMs formation(especially brominated species) when the UV/Clprocess is adopted as a disinfection technique.

关键词： HNMs UV/Cl2 process methylamine Bromide

Understanding the precursor chemistry for one-step deposition of mixed cation perovskite solar cells by methylamine route

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Journal of Energy Chemistry 2021年第6期30卷 386-391,I0010页

作者： Manuel Vásquez-Montoya Juan F.Montoya Daniel Ramirez Franklin Jaramillo Centro de Investigación Innovación y Desarrollo de Materiales CIDEMATUniversidad de Antioquia UdeACalle 70 No.52-21MedellínColombia

Upscaling perovskite solar cell fabrication is one of the key challenges in the pathway for *** slow evaporation of frequently used solvents(DMF or DMSO) limits the fast perovskite layer crystallization,hindering their implementation in large scale deposition ***,methylamine-based precursors have demonstrated rapid crystallization,leading to uniform and specular ***,their application has been limited to MAPbI3 perovskites with limited efficiency and *** this work,we report the requirements for stabilizing α-phase of mixed cation perovskites with high amount of formamidinium by using a methylamine-based *** found that even though,there are many methods for incorporating the methylamine(MA) in precursors or films;the MA content determines stabilization of the α-phase and therefore the viscous-solution route is the only method to incorporate high amounts of *** low amounts of MA,perovskite tend to crystallize in 1D dimensional FA_(3)(MA)PbI5 phases due to the incomplete solvation of the *** contrast,high MA ratio induces a full solvation of the clusters,leading to a rapid crystallization and a full stabilization of the active 3D α-*** results open a window in the development and understanding of new precursors for the fabrication of high efficient,stable and scalable perovskite devices.

关键词： methylamine Stabilizingα-phase Mixed cation perovskite precursor Formamidinium Upscaling Perovskite Solar cells

Interaction of methylamine with Highly Siliceous MFI, FAU and FER-type Zeolites

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Chinese Journal of Chemistry 2005年第4期23卷 413-417页

作者：韩爱杰曾宇郭娟黄月芳贺鹤勇龙英才 ShanghaiKeyLaboratoryofMolecularCatalysisandInnovativeMaterials DepartmentofChemistryFudanUniversityShanghai200433China CenterofAnalysisandMeasurement FudanUniversityShanghai200433China

The adsorption of methylamine on highly siliceous MFI, FAU and FER‐type zeolites was investigated with XRD, FT‐IR, Raman, 13 C and 29 Si MAS NMR, and compared with the adsorption of methanol. As the adsorption of the amine, the relative intensity of XRD peaks of the zeolites has been changed significantly, the high‐resolution 29 Si MAS NMR peaks have been broadened and shifted to low field, and the resonance of Si  OH groups has appeared. The vibration of N  H has been shifted to low frequency and C  N vibration moved to high frequency in the IR spectra, and the 13 C resonance peak broadened and shifted to high field for the adsorbed amine. The facts reveal an associating interaction between the perfect framework of the zeolites and the adsorbed methylamine with hydrogen bonds, leading to the formation of Si  OH groups and the high desorption temperature of the methyl‐amine from the zeolites.

关键词： highly siliceous MFI or FAU or FER‐type zeolites adsorption methylamine association

Configuration Interconversion and Flipping of Hydrogen Bond in the Neutral methylamine Dimer Revealed by Infrared Spectroscopy

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Configuration Interconversion and Flipping of Hydrogen Bond ...

One-pot Synthesis of lO-Methyl-1,2,3,4,5,6,7,8,9,10-decahydroacridine-l,8-dione Derivatives under Microwave Heating without Catalyst

第十五届全国化学动力学会议

作者：张冰冰 Xiangtao Kong Shukang Jiang Ling Jiang State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Sciences

Solvation clusters, produced and probed in the gas phase, are often taken as microscopic models for solutions. However, neutral solvation clusters are much more challenging to measure, due to difficulties in both size selection and signal detection [1-5]. Recently, infrared-vacuum ultraviolet(IR-VUV) spectroscopy of neutral clusters has aroused great interest [6-9]. Well-resolved IR spectrum of neutral methylamine dimer,(CHNH), was measured in the C-H and N-H stretching region using the Dalian IR-VUV apparatus. Quantum chemical calculations and molecular dynamics simulations were performed to identify the structures and to assign the observed spectral features. Experimental and theoretical results reveal the dynamic nature of(CHNH) with the involvement of fast configuration interconversion and extensive flipping of hydrogen bond. The present work demonstrates a fundamental model to understand the microscopic details in the solvent-solvent interaction and the vibrational couplings among the biologically ubiquitous CH and NH groups [10].

关键词： IR-VUV Spectroscopic clusters IRPD methylamine Quantum chemical calculations

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Chinese Journal of Chemistry 2005年第12期23卷 1646-1650页

作者：华国平章晓镜石枫屠树江徐佳宁王倩朱晓彤张金鹏纪顺俊 Xuzhou Institute of Architectural Technology Xuzhou Jiangsu 221008 China Key Laboratory of Biotechnology for Medicinal Plants Department of Chemistry Xuzhou Normal University Xuzhou Jiangsu 221116 China Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry and Chemical Engineering Suzhou University Suzhou Jiangsu 215006 China

A series of 10-methyl-1,2,3,4,5,6,7,8,9,10-decahydroacridine-1,8-dione derivatives were synthesized by one-pot reaction of aldehyde, dimedone or 1,3-cyclohexanedione and methylamine in glycol or water under microwave heating without catalyst. The method has the advantage of short routine and reaction time, high yields as well as friendly environment. And the reaction was not only suitable for aliphatic and aromatic monoaldehyde, but also for aromatic dialdehyde.

关键词： aldehyde dimedone 1,3-cyclohexanedione methylamine 10-methyl-1,2,3,4,5,6,7,8,9,10-decahydroacridine-1,8-dione microwave heating

MODIFICATION OF X-5 RESIN AND ADSORPTION PROPERTY OF THE MODIFIED RESINS

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Chinese Journal of Reactive Polymers 2002年第2期11卷 162-166页

作者： HUANG Jiangou XUMancai LI Haitao SHI Zuoqing HE Binglin College of Chemistry and Chemical Engineering Hunan Normal UniversityChangsha 410081 The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation Institute of Polymer ChemistryNankai UniversityTianjin 300071

Three polymeric adsorbents with hydrogen bonding acceptors, methylamine, N-methyl-acetamide and aminotri(hydroxymethyl)methane modified resins are synthesized from chloromethylated X-5 resin. Adsorption isotherms of phenol and theophylline onto the three modified resins and the original X-5 resin from aqueous solution are measured. The results show that adsorption of compounds with hydrogen bonding donor onto methylamine and N-methylacetamide modified resins is enhanced as compared with that onto X-5 resin, and adsorption mechanism between the adsorbents and the adsorbates is mainly based on hydrogen bonding and hydrophobic interaction. While adsorption of compounds with hydrogen bonding donor onto aminotri(hydroxymethyl)methane modified resin is lowered as compared with that onto X-5 resin, and adsorption mechanism between the adsorbent and the adsorbates is mainly based on hydrophobic interaction.

关键词： methylamine N-methylacetamide Aminotri(hydroxymethyl)methane X-5 resin Modification Adsorption Phenol Theophylline Caffeine

LC-MS用于肌酸长期使用的细胞毒性机理研究

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LC-MS用于肌酸长期使用的细胞毒性机理研究