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-substituted benzaldehyde 1

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Electrochemical reduction characteristics and the mechanism of chlorinated hydrocarbons at the copper

XU Wenying, GAO Tingyao, ZHOU Rongfeng, MA Lumin

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 2,   Pages 207-212 doi: 10.1007/s11783-007-0036-y

Abstract: The electrochemical reduction characteristics of chlorinated hydrocarbons were investigated by cyclicThe reduction mechanism and activity of the chlorinated hydrocarbons at the copper electrode were exploredThe relationship between the structure of chlorinated hydrocarbons and their reductive activity wereThe experimental results showed that chlorinated alkanes and a portion of chlorinated aromatic hydrocarbonsHowever, chlorinated aromatic hydrocarbons were not easy to reduce at the copper electrode.

Keywords： electrolysis     chlorinated     relationship     mechanism     voltammetry technique    

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Degradation of chlorinated phenols by nanoscale zero-valent iron

CHENG Rong, WANG Jianlong, ZHANG Weixian

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 1,   Pages 103-108 doi: 10.1007/s11783-008-0009-9

Abstract: particles were prepared using chemical reduction, and the reductive transformations of three kinds of chlorinated
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Decomposition of aqueous chlorinated contaminants by UV irradiation with H

Eunsung KAN,Chang-Il KOH,Kyunghyuk LEE,Joonwun KANG

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 3,   Pages 429-435 doi: 10.1007/s11783-014-0677-6

Abstract: In the present study, the decomposition rates of carbon tetrachloride (CCl ) and 2,4-dichlorophenol (2,4-DCP) in water by the ultraviolet (UV) light irradiation alone and H O /UV were experimentally investigated. The detailed experimental studies have been conducted for examining treatment capacities of the two different ultraviolet light sources (low and medium pressure Hg arc) in H O /UV processes. The low or medium UV lamp alone resulted in a 60%–90% decomposition of 2,4-DCP while a slight addition of H O resulted in a drastic enhancement of the 2,4-DCP decomposition rate. The decomposition rate of 2,4-DCP with the medium pressure UV lamp alone was about 3–6 times greater than the low pressure UV lamp alone. In the direct photolysis of aqueous CCl , the medium pressure UV lamp had advantage over the low pressure UV lamp because the molar extinction coefficient of CCl at shorter wavelength (210–220 nm) is about 20 to 50 times higher than that at 254 nm. However, adding H O to the medium pressure UV lamp system rendered a negative oxidation rate because H O acted as a UV absorber being competitive with CCl due to negligible reaction between CCl and OH radicals. The results from the present study indicated significant influence of the photochemical properties of the target contaminants on the photochemical treatment characteristics for designing cost-effective UV-based degradation of toxic contaminants.

Keywords： H2O2/ultraviolet (UV) light     advanced oxidation     UV light irradiation     chlorinated    

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Synthesis of nanofluids composed of deep eutectic solvents and metal-modified MCM-41 particles as multifunctional

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 11,   Pages 1776-1787 doi: 10.1007/s11705-023-2314-z

Abstract: Compared with traditional hydrodesulfurization, new nonhydrodesulfurization methods have the advantage of a high removal efficiency for thiophene compounds under mild conditions. However, independent nonhydrodesulfurization technologies are faced with their own shortcomings, such as limitations of the desulfurization performance and regeneration of materials. To overcome these limitations, four nanofluids were prepared by dispersing different metal-modified MCM-41 particles in deep eutectic solvent as multifunctional promoters to develop a comprehensive desulfurization method. Based on the excellent adsorbability and high catalytic activity of the dispersed particles and the outstanding extractability of deep eutectic solvent in nanofluids, a high sulfur removal of 99.33% was achieved for model oil under mild conditions in 15 min. The nanofluids also showed excellent reusability due to their high structural stability. In addition, NF@Cu/Al-MCM-41-2.5% exhibited the best desulfurization performance among the prepared nanofluids. This result was obtained because the introduction of Al ions increased the number of acid sites and defect sites to improve the catalytic activity and adsorbability, and the best affinity of Cu/Al-MCM-41 for the deep eutectic solvent favored the reaction mass transfer. This work opens the door to the development of a comprehensive nonhydrodesulfurization method based on the design of nanofluid materials.

Keywords： fuel oil desulfurization     nanofluids     catalytic ozonation    

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Fenton process for degradation of selected chlorinated aliphatic hydrocarbons exemplified by trichloroethylene

QIANG Zhimin, BEN Weiwei, HUANG Chin-Pao

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 4,   Pages 397-409 doi: 10.1007/s11783-008-0074-0

Abstract: The degradation of selected chlorinated aliphatic hydrocarbons (CAHs) exemplified by trichloroethyleneradicals (OH) preferred to attack the organic contaminants with an electron-rich structure such as chlorinated

Keywords： identified     1     1-dichloroethylene     kinetic     Dichloroacetic     Chloride    

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Kinetics and mechanisms of reactions for hydrated electron with chlorinated benzenes in aqueous solution

Haixia YUAN,Huxiang PAN,Jin SHI,Hongjing LI,Wenbo DONG

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 4,   Pages 583-590 doi: 10.1007/s11783-014-0691-8

Abstract: The reactions between chlorinated benzenes (CBzs) and hydrated electron ( ) were investigated by the

Keywords： chlorinated benzenes     hydrated electron     electron beam     laser flash photolysis    

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Effects of solvents and temperature on spherulites of self-assembled phloroglucinol tristearate

Yawen Yao, Sabine Rosenfeldt, Kai Zhang

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 3,   Pages 389-396 doi: 10.1007/s11705-019-1911-3

Abstract: Spherulites of crystallized PhgTS from four solvents under diverse conditions were analyzed in detailMaltese cross is shown by PhgTS spherulites obtained from aprotic solvents via polarized optical microscopyIn comparison, no Maltese cross can be observed from branch-like crystals formed from protic solventsAlthough differential characters of the solvents did not affect the formation of lamellas, the solventsstrongly affected by the concentration of PhgTS solutions, surrounding temperature and evaporation rate of solvents

Keywords： phloroglucinol     tristearate     aprotic and protic solvent     self-assembly     spherulites    

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Microbial responses to combined oxidation and catalysis treatment of 1,4-dioxane and co-contaminants in groundwater and soil

Yu Miao, Nicholas W. Johnson, Kimberly Heck, Sujin Guo, Camilah D. Powell, Thien Phan, Phillip B. Gedalanga, David T. Adamson, Charles J. Newell, Michael S. Wong, Shaily Mahendra

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 5, doi: 10.1007/s11783-018-1071-6

Abstract:

Groundwater microbial community was altered after catalysis and chemical oxidation.

The coupled treatment train removed 90% 1,4-dioxane regardless of co-contaminants.

Dynamics of microbial populations varied along with different treatment stages.

Many microbial taxa exhibited resilience against oxidative and catalytic treatments.

Metagenomic analysis will be valuable for long-term management of polluted sites.

Keywords： Coupled treatments     Chlorinated solvents     Diethylene ether     Biological diversity     Microbial populations     Biomarkers    

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Synthesis of p -substituted tetraphenylporphyrins and corresponding ferric complexes with mixed-solvents

Zhicheng SUN, Yuanbin SHE, Rugang ZHONG,

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 4,   Pages 457-461 doi: 10.1007/s11705-009-0169-6

Abstract: By using mixed-solvents method, five kinds of -substituted tetraphenylporphyrin compounds [T(-R)PPH,CH, OCH, OH] were synthesized by the condensation of -substituted benzaldehyde with pyrrole in mixed solventsEffects of reactive conditions, solvents and oxidants on yields of free base porphyrins were investigated

Keywords： -substituted tetraphenylporphyrin     condensation     -substituted benzaldehyde     dimethylformamide     metalation    

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The influence of chlorinated aromatics' structure on their adsorption characteristics on activated carbon

Pengfei LIN,Yuan ZHANG,Xiaojian ZHANG,Chao CHEN,Yuefeng XIE,Irwin H SUFFET

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 1,   Pages 138-146 doi: 10.1007/s11783-014-0725-2

Abstract: The Freundlich isotherm equation could well describe the adsorption equilibrium behaviors of chlorinatedThese results could assist water professionals in removing chlorinated aromatics during emergency drinking

Keywords： chlorinated aromatics     adsorption     powdered activated carbon     kinetics     equilibrium    

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preparation of polybenzoxazine-based carbon microspheres with nitrogen functionalities: Effects of mixed solvents

Uthen Thubsuang, Suphawadee Chotirut, Apisit Thongnok, Archw Promraksa, Mudtorlep Nisoa, Nicharat Manmuanpom, Sujitra Wongkasemjit, Thanyalak Chaisuwan

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 6,   Pages 1072-1086 doi: 10.1007/s11705-019-1899-8

Abstract: In this study, polybenzoxazine (PBZ)-based carbon microspheres were prepared via a facile method using a mixture of formaldehyde (F) and dimethylformamide (DMF) as the solvent. The PBZ microspheres were successfully obtained at the F/DMF weight ratios of 0.4 and 0.6. These microspheres exhibited high nitrogen contents after carbonization. The microstructures of all the samples showed an amorphous phase and a partial graphitic phase. The porous carbon with the F/DMF ratio of 0.4 showed significantly higher specific capacitance (275.1 F g ) than the reference carbon (198.9 F g ) at 0.05 A g . This can be attributed to the synergistic electrical double-layer capacitor and pseudo-capacitor behaviors of the porous carbon with the F/DMF ratio of 0.4. The presence of nitrogen/oxygen functionalities induced pseudo-capacitance in the microspheres, and hence increased their total specific capacitance. After activation with CO , the specific surface area of the carbon microspheres with the F/DMF ratio of 0.4 increased from 349 to 859 m g and the specific capacitance increased to 424.7 F g . This value is approximately two times higher than that of the reference carbon. The results indicated that the F/DMF ratio of 0.4 was suitable for preparing carbon microspheres with good supercapacitive performance. The nitrogen/oxygen functionalities and high specific surface area of the microspheres were responsible for their high capacitance.

Keywords： PBZ     carbon     porous materials     microsphere     supercapacitor    

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microspheres prepared through a facile aerosol-based process for the simultaneous adsorption and reduction of chlorinated

Bhanukiran SUNKARA,Yang SU,Jingjing ZHAN,Jibao HE,Gary L. MCPHERSON,Vijay T. JOHN

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 5,   Pages 939-947 doi: 10.1007/s11783-015-0807-9

Abstract: aerosol-based process are effective remediation agents for the simultaneous adsorption and reduction of chlorinatedComplete dechlorination was achieved for the class of chlorinated ethenes that include tetrachloroethylenerequisite characteristics of adsorption, reaction, and transport for the effective in situ remediation of chlorinatedThe adsorption of chlorinated ethenes on the Fe-C composites is higher (>80%) than that of humic acid

Keywords： chlorinated ethene     iron-carbon     aerosol     adsorption     reductive dechlorination    

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Unraveling Membrane Fouling Induced by Chlorinated Water Versus Surface Water: Biofouling Properties Article

Li Zhang, Lei Xu, Nigel Graham, Wenzheng Yu,

Engineering 2022, Volume 15, Issue 8,   Pages 154-164 doi: 10.1016/j.eng.2021.03.016

Abstract: As a pre-treatment during water treatment, it remains unclear whether chlorinated water can effectively

Keywords： Membrane fouling     Biofilm     GDM filtration technology     Ultrafiltration     Chlorine-resistant bacteria     Hydrophilicity    

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Title Author Date Type Operation

Electrochemical reduction characteristics and the mechanism of chlorinated hydrocarbons at the copper

XU Wenying, GAO Tingyao, ZHOU Rongfeng, MA Lumin

Journal Article

Degradation of chlorinated phenols by nanoscale zero-valent iron

CHENG Rong, WANG Jianlong, ZHANG Weixian

Journal Article

Decomposition of aqueous chlorinated contaminants by UV irradiation with H

Eunsung KAN,Chang-Il KOH,Kyunghyuk LEE,Joonwun KANG

Journal Article

Synthesis of nanofluids composed of deep eutectic solvents and metal-modified MCM-41 particles as multifunctional

Journal Article

Fenton process for degradation of selected chlorinated aliphatic hydrocarbons exemplified by trichloroethylene

QIANG Zhimin, BEN Weiwei, HUANG Chin-Pao

Journal Article

Kinetics and mechanisms of reactions for hydrated electron with chlorinated benzenes in aqueous solution

Haixia YUAN,Huxiang PAN,Jin SHI,Hongjing LI,Wenbo DONG

Journal Article

Effects of solvents and temperature on spherulites of self-assembled phloroglucinol tristearate

Yawen Yao, Sabine Rosenfeldt, Kai Zhang

Journal Article

Microbial responses to combined oxidation and catalysis treatment of 1,4-dioxane and co-contaminants in groundwater and soil

Yu Miao, Nicholas W. Johnson, Kimberly Heck, Sujin Guo, Camilah D. Powell, Thien Phan, Phillip B. Gedalanga, David T. Adamson, Charles J. Newell, Michael S. Wong, Shaily Mahendra

Journal Article

Synthesis of p -substituted tetraphenylporphyrins and corresponding ferric complexes with mixed-solvents

Zhicheng SUN, Yuanbin SHE, Rugang ZHONG,

Journal Article

The influence of chlorinated aromatics' structure on their adsorption characteristics on activated carbon

Pengfei LIN,Yuan ZHANG,Xiaojian ZHANG,Chao CHEN,Yuefeng XIE,Irwin H SUFFET

Journal Article

preparation of polybenzoxazine-based carbon microspheres with nitrogen functionalities: Effects of mixed solvents

Uthen Thubsuang, Suphawadee Chotirut, Apisit Thongnok, Archw Promraksa, Mudtorlep Nisoa, Nicharat Manmuanpom, Sujitra Wongkasemjit, Thanyalak Chaisuwan

Journal Article

microspheres prepared through a facile aerosol-based process for the simultaneous adsorption and reduction of chlorinated

Bhanukiran SUNKARA,Yang SU,Jingjing ZHAN,Jibao HE,Gary L. MCPHERSON,Vijay T. JOHN

Journal Article

Unraveling Membrane Fouling Induced by Chlorinated Water Versus Surface Water: Biofouling Properties

Li Zhang, Lei Xu, Nigel Graham, Wenzheng Yu,

Journal Article