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Adsorbability of Mycobacterium phlei on hematite surface

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Journal of University of Science and Technology Beijing 2007年第2期14卷 103-106页

作者： Huifen Yang Qiang Zhang Zhuan Jiang Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China

The adsorption of microorganisms on the mineral surface is the base of microorganisms that are considered as mineral processing reagents. The principles of the use of a highly hydrophobic and negatively charged bacterium, Mycobacterium phlei, as a flocculating-flotating agent for finely divided hematite were investigated. The flocculating-floating recovery is strongly dependent on the pH and the dosage of the bacterium. Generally the pH should be controlled over the range of 5.5-7, and the dosage should be controlled about 16 mg/L. The infrared spectrometry analysis indicates that the six functional groups of M. phlei, substituted aromatic compound groups, -（CH2） n-groups, -CH2（-CH3） groups, carbonyl groups, aromatic hydrocarbon groups, and carboxyl groups, are on the hematite surface, among which the first five ones contribute physical adsorption and only the carboxyl groups provide chemisorption. Microscopic analysis reveals that the dimensions and tight aggregation degree of the flocs of hematite particles formed by M. phlei are also impacted by the pH and the content of M. phlei in flotation.

关键词： microorganisms mycobacterium phlei hematite flocculation flotation infrared spectrometry microscopic analysis physical adsorption chemisorption

Effects of Solvents on Extraction of Effective Components from Cell Wall Tissues of Chinese Traditional Medicines

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Chemical Research in Chinese Universities 2009年第6期25卷 899-903页

作者： LIU Cheng-bai TIAN Luo YU Zhen-xiang ZHANG Feng-chun CHEN Xia College of Life Science Jilin University Changchun 130021 P. R. China Department of Respiratory Medicine First Hospital of Jilin University Changchun 130021 P. R. China

The effects of different Chinese traditional medicines were solvents on the extraction of effective studied by the histochemical methods, components from the cell wall tissues of such as the bare-handed section, swelling ratio, paraffin section, IR spectrum and cell wall component analysis. The results show that the ethanol-alkali solvent could increase the swelling ratio as well as the swelling speed. The effective components of cell wall tissues extracted by ethanol-alkali solvent become loose shown by the paraffin section. According to the IR spectrum analysis and the results of cell wall tissue component analysis, it was found that the ethanol-alkali solvent could decrease the contents of pectin and hemicellulose in the cell wall to make the wall broken, and therefore the effective components can be extracted easily by the solvent and the extraction rate is increased.

关键词： Solvent Cell wall Paraffin Section infrared spectrometry

Application of a novel detection approach based on non-dispersive infrared theory to the in-situ analysis on indicator gases from underground coal fire

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Journal of Central South University 2022年第6期29卷 1840-1855页

作者： TIAN Fu-chao LIANG Yun-tao ZHU Hong-qing CHEN Ming-yi WANG Jin-cheng College of Emergency Management and Safety Engineering China University of Mining and Technology(Beijing)Beijing 100083China State Key Laboratory of Coal Mine Safety Technology China Coal Technology&Engineering Group Shenyang Research InstituteShenyang 113122China Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology) Ministry of EducationXuzhou 221116China Key Laboratory of Roads and Railway Engineering Safety Control(Shijiazhuang Tiedao University) Ministry of EducationShijiazhuang 050043China

Coal mine fires,which can cause heavy casualties,environmental damages and a waste of coal resources,have become a worldwide *** at overcoming the drawbacks,such as a low analysis efficiency,poor stability and large monitoring error,of the existing underground coal fire monitoring technology,a novel monitoring system based on non-dispersive infrared(NDIR)spectroscopy is *** this study,first,the measurement principle of NDIR sensor,the gas concentration calculation and its temperature compensation algorithms were ***,taking CO and CH_(4) as examples,the liner correlation coefficients of absorbance and the temperature correction factors of the two indicator gases were calculated,and then the errors of concentration measurement for CO,CO_(2),CH_(4) and C_(2)H_(4) were further *** results disclose that the designed NDIR sensors can satisfy the requirements of industrial standards for monitoring the indicator gases for coal fire *** the established NDIR-based monitoring system,the NDIRbased spectrum analyzer and its auxiliary equipment boast intrinsically safe and explosion-proof performances and can achieve real-time and in-situ detection of indicator gases when installed close to the coal fire risk area ***,a field application of the NDIR-based monitoring system in a coal mine shows that the NDIR-based spectrum analyzer has a permissible difference from the chromatography in measuring the concentrations of various indicator ***,the advantages of high accuracy,quick analysis and excellent security of the NDIR-based monitoring system have promoted its application in many coal mines.

关键词： indicator gas coal spontaneous combustion infrared spectrometry bundle tube monitoring intrinsically safe