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Characterization of humic substances in bio-treated municipal solid waste landfill leachate

Guangxia QI, Dongbei YUE, Yongfeng NIE

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 5,   Pages 711-716 doi: 10.1007/s11783-012-0421-z

Abstract: Considerable organic matter remains in municipal solid waste landfill leachate after biological treatments. Humic substances (HSs) dominate the organic matter in bio-treated landfill leachate. In this study, the HSs from landfill leachate treated by membrane bioreactor (MBR-HSs) were analyzed via elemental analysis, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, and charge polarized magic-angle spinning- C-nuclear magnetic resonance. The characteristic absorption in the UV wavelength range indicated the presence of high C=C and C=O double bonds within the MBR-HSs. Compared with commercial HSs, MBR-HSs had lower carbon content [48.14% for fulvic acids (FA) and 49.52% for humic acids (HA)], higher nitrogen content (4.31% for FA and 6.16% for HA), lower aromatic structure content, and higher carbohydrate and carboxylic atoms of carbon content. FA predominantly had an aliphatic structure, and HA had less condensed or substituted aromatic ring structures than natural HA. The aromatic carbon content of MBR-HSs was lower than that of humus-derived HSs but higher than that of waste-derived HSs, indicating that MBR-HSs appeared to be more similar to humus-derived HSs than waste-derived HA.

Keywords： bio-treated landfill leachate     humic substances     elemental analysis     spectroscopic characteristics    

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V-shaped substrate for surface and volume enhanced Raman spectroscopic analysis of microplastics

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 11, doi: 10.1007/s11783-022-1578-8

Abstract:

● V-shaped substrate was obtained for SERS analysis of microplastics (diameter ≈ 1 μm).

Keywords： SERS     V-shaped     AAO     Microplastic     Atmospheric aerosol    

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fulvic acids during thermal sludge treatment assessed by size fractionation, elementary analysis, and spectroscopic

Yuning YANG,Huan LI,Jinyi LI

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 6,   Pages 854-862 doi: 10.1007/s11783-014-0755-9

Abstract: 180°C, and then their contents, molecular weight distributions, elementary compositions, and spectral characteristics

Keywords： sludge     thermal treatment     humic acids     fulvic acids    

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Diporphyrin tweezer for multichannel spectroscopic analysis of enantiomeric excess

Daniel T. Payne, Mandeep K. Chahal, Václav Březina, Whitney A. Webre, Katsuhiko Ariga, Francis D’Souza, Jan Labuta, Jonathan P. Hill

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 1,   Pages 28-40 doi: 10.1007/s11705-019-1869-1

Abstract: Chiral 1,1’-binaphthyl-linked diporphyrin ‘tweezers’ ( )- /( )- and the corresponding zinc(II) complexes ( )- /( )- were prepared as chiral host molecules, and their utility for chiral analyses (especially enantiomeric excess ( ) determinations) were evaluated. Tris(1- -dodecyl)porphyrins were used for the first time as the interacting units. Host capabilities of the diporphyrin tweezers were investigated by titrations with ( , )- and ( , )-cyclohexane-1,2-diamine (CHDA). The host molecules could be used as multichannel probes of by using UV-vis, circular dichroism (CD), fluorescence emission and H nuclear magnetic resonance ( H-NMR) methods. Chiral configurations could also be differentiated using CD or H-NMR spectroscopy. All three optical techniques give good resolution of with reasonable sensitivity considering the low concentrations used (ca. 10 mol·L ). The determination of CHDA enantiomers using NMR spectroscopy is also possible because of the reasonably well separated resonances in the case of ( , )- and ( , )-CHDA. Non-metallated ( )- /( )- hosts could not be used to detect chiral information in a strongly acidic chiral guest. This work demonstrates the utility of 1,1’-binapthyl-linked chiral hosts for chiral analysis of ditopically interacting enantiomers.

Keywords： porphyrin dimer     chirality     enantiomeric excess     CD     fluorescence    

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Synthesis, spectroscopic, and electrochemical properties of two dyads consisted of tetrathiafulvalene

Guoqiao LAI, Yibo LIU, Meijiang LI, Yongjia SHEN

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 2,   Pages 192-195 doi: 10.1007/s11705-009-0015-x

Abstract: Two donor-σ-acceptor molecules containing tetrathiafulvalene (TTF) and carbazole moieties were synthesized by the reaction of 9-(4-bromo-butyl)-carbazole ( ) with 2,6-bis(hexylthio)-3-(2-cyanoethylthio)-7-(methylthio)-tetrathiafulvalene ( ) or 2,6-bis(2-cyanoethylthio)-3,7-bis(methylthio)tetrathiafulvalene ( ) in the presence of CsOH·H O, respectively. The structures of the molecules were characterized by H NMR, C NMR, MS, and elemental analyses. They showed negligible intramolecular charge-transfer interaction in their ground states as indicated by their UV-Vis spectroscopics and cyclic voltammetry results. Compared with carbazole, their fluorescence was strongly quenched, which implied that a photo induced electron transfer (PET) interaction between TTF and carbazole moieties occurred.

Keywords： donor-σ-acceptor molecule     intramolecular charge transfer interaction     photo induced electron transfer     tetrathiafulvalene     carbazole    

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Fluorescence spectroscopic studies of the effect of granular activated carbon adsorption on structural

Shuang XUE, Qingliang ZHAO, Liangliang WEI, Xiujuan HUI, Xiping MA, Yingzi LIN

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 6,   Pages 784-796 doi: 10.1007/s11783-012-0436-5

Abstract: This work investigated the effect of granular activated carbon adsorption (GACA) on fluorescence characteristics

Keywords： granular activated carbon adsorption     dissolved organic matter     fractionation     fluorescence    

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Recent progress in hydrodynamic characteristics research and application of annular centrifugal extractors

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6,   Pages 854-873 doi: 10.1007/s11705-022-2156-0

Abstract: Hence, this paper reviews research progress regarding ACE in terms of hydrodynamic characteristics and

Keywords： annular centrifugal extractor     hydrodynamic characteristics     structure optimization     the latest application    

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Clinical characteristics and outcomes of biopsy-proven diabetic nephropathy

Li Zhuo, Nianrong Zhang, Guming Zou, Dapeng Chen, Wenge Li

Frontiers of Medicine 2017, Volume 11, Issue 3,   Pages 386-392 doi: 10.1007/s11684-017-0574-z

Abstract: In conclusion, the clinical characteristics of DN vary, and renal biopsy is necessary to determine renal

Keywords： diabetic nephropathy     clinical characteristics     renal biopsy     outcomes    

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Obesity in China: its characteristics, diagnostic criteria, and implications

Weiping Jia

Frontiers of Medicine 2015, Volume 9, Issue 2,   Pages 129-133 doi: 10.1007/s11684-015-0387-x

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Prospect in Creating New Drugs from Chinese Herbal Medicine

Yu Dequan

Strategic Study of CAE 1999, Volume 1, Issue 2,   Pages 87-90

Abstract: Natural product research should be featured by the application of modern spectroscopic techniques, such

Keywords： natural product research     creating new drug     chemical constituent of Chinese herbal medicine     modem spectroscopic    

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Obesity-related glomerulopathy: pathogenesis, pathologic, clinical characteristics and treatment

Tianhua Xu, Zitong Sheng, Li Yao

Frontiers of Medicine 2017, Volume 11, Issue 3,   Pages 340-348 doi: 10.1007/s11684-017-0570-3

Abstract:

In light of the rapid increase in the number of obesity incidences worldwide, obesity has become an independent risk factor for chronic kidney disease. Obesity-related glomerulopathy (ORG) is characterized by glomerulomegaly in the presence or absence of focal and segmental glomerulosclerosis lesions. IgM and complement 3 (C3) nonspecifically deposit in lesions without immune-complex-type deposits during ORG immunofluorescence. ORG-associated glomerulomegaly and focal and segmental glomerulosclerosis can superimpose on other renal pathologies. The mechanisms under ORG are complex, especially hemodynamic changes, inflammation, oxidative stress, apoptosis, and reduced functioning nephrons. These mechanisms synergize with obesity to induce end-stage renal disease. A slow increase of subnephrotic proteinuria (<3.5 g/d) is the most common clinical manifestation of ORG. Several treatment methods for ORG have been developed. Of these methods, renin–angiotensin–aldosterone system blockade and weight loss are proven effective. Targeting mitochondria may offer a novel strategy for ORG therapy. Nevertheless, more research is needed to further understand ORG.

Keywords： obesity-related glomerulopathy     pathogenesis     pathologic     clinical characteristics    

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Dynamic characteristics of molten droplets and hot particles falling in liquid pool

Liangxing LI, Weimin MA, Huixiong LI, Tingkuan CHEN,

Frontiers in Energy 2010, Volume 4, Issue 2,   Pages 246-251 doi: 10.1007/s11708-009-0077-y

Abstract: The dynamic characteristics of molten droplets and hot particles at the very beginning of their fall

Keywords： dynamic characteristics     molten droplets     high-temperature particles     fuel and coolant interactions    

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Combustion characteristics and kinetics of bio-oil

Ruixia ZHANG, Zhaoping ZHONG, Yaji HUANG

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 2,   Pages 119-124 doi: 10.1007/s11705-009-0068-x

Abstract: The combustion characteristics of bio-oils derived from rice husk and corn were studied by thermogravimetrythermal analysis (DTA) curves of bio-oils in air and nitrogen atmosphere, we analyzed the combustion characteristics

Keywords： bio-oil     combustion characteristics     combustion kinetics    

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Study on combustion characteristics of blended coals

LI Yonghua, WANG Chunbo, CHEN Hongwei

Frontiers in Energy 2007, Volume 1, Issue 1,   Pages 96-100 doi: 10.1007/s11708-007-0010-1

Abstract: rig with a capacity of 640 MJ/h with an absolute milling system and flue gas online analysis system, characteristics

Keywords： combustion     capacity     variety     blended     burnout    

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The strength–dilatancy characteristics embraced in hypoplasticity

Zhongzhi FU, Sihong LIU, Zijian WANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 178-187 doi: 10.1007/s11709-013-0191-0

Abstract: The strength-dilatancy characteristics of frictional materials embraced in the hypoplastic model proposed

Keywords： strength     dilatancy     hypoplasticity     frictional materials    

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Title Author Date Type Operation

Characterization of humic substances in bio-treated municipal solid waste landfill leachate

Guangxia QI, Dongbei YUE, Yongfeng NIE

Journal Article

V-shaped substrate for surface and volume enhanced Raman spectroscopic analysis of microplastics

Journal Article

fulvic acids during thermal sludge treatment assessed by size fractionation, elementary analysis, and spectroscopic

Yuning YANG,Huan LI,Jinyi LI

Journal Article

Diporphyrin tweezer for multichannel spectroscopic analysis of enantiomeric excess

Daniel T. Payne, Mandeep K. Chahal, Václav Březina, Whitney A. Webre, Katsuhiko Ariga, Francis D’Souza, Jan Labuta, Jonathan P. Hill

Journal Article

Synthesis, spectroscopic, and electrochemical properties of two dyads consisted of tetrathiafulvalene

Guoqiao LAI, Yibo LIU, Meijiang LI, Yongjia SHEN

Journal Article

Fluorescence spectroscopic studies of the effect of granular activated carbon adsorption on structural

Shuang XUE, Qingliang ZHAO, Liangliang WEI, Xiujuan HUI, Xiping MA, Yingzi LIN

Journal Article

Recent progress in hydrodynamic characteristics research and application of annular centrifugal extractors

Journal Article

Clinical characteristics and outcomes of biopsy-proven diabetic nephropathy

Li Zhuo, Nianrong Zhang, Guming Zou, Dapeng Chen, Wenge Li

Journal Article

Obesity in China: its characteristics, diagnostic criteria, and implications

Weiping Jia

Journal Article

Prospect in Creating New Drugs from Chinese Herbal Medicine

Yu Dequan

Journal Article

Obesity-related glomerulopathy: pathogenesis, pathologic, clinical characteristics and treatment

Tianhua Xu, Zitong Sheng, Li Yao

Journal Article

Dynamic characteristics of molten droplets and hot particles falling in liquid pool

Liangxing LI, Weimin MA, Huixiong LI, Tingkuan CHEN,

Journal Article

Combustion characteristics and kinetics of bio-oil

Ruixia ZHANG, Zhaoping ZHONG, Yaji HUANG

Journal Article

Study on combustion characteristics of blended coals

LI Yonghua, WANG Chunbo, CHEN Hongwei

Journal Article

The strength–dilatancy characteristics embraced in hypoplasticity

Zhongzhi FU, Sihong LIU, Zijian WANG

Journal Article