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Two-step hydrothermal conversion of biomass waste to humic acid using hydrochar as intermediate

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 10, doi: 10.1007/s11783-023-1719-8

Abstract: A two-step hydrothermal treatment method was adopted in this study to produce humic acid from corn stalksIn the first step of the process, hydrochar was prepared at different hydrothermal temperatures and pHchemical properties were then analyzed, and the hydrochar-derived humic acids were produced under alkaline hydrothermalwere as follows: 1) production in the hydrochar preparation stage, and 2) increment under the alkaline hydrothermalThis study provides an important reference for the preparation of suitable hydrochar with high hydrothermal

Keywords： Biowaste     Hydrochar     Humic acid     Hydrothermal parameter     Unsaturation    

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Research progress on hydrothermal dissolution and hydrolysis of lignocellulose and lignocellulosic waste

Yan ZHAO, Wenjing LU, Jiajun CHEN, Xiangfeng ZHANG, Hongtao WANG

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 2,   Pages 151-161 doi: 10.1007/s11783-013-0607-z

Abstract: Previous studies have shown that pretreatment and hydrolysis are key processes for lignocellulose conversionHydrothermal process is a promising technique because of its efficiency to break down the lignocellulosicto produce high yields of fermentable hexoses is mainly attributed to inadequate information on the conversionlignocellulose, particularly the reaction rules of dissolution, which is a limiting step in the entire conversionThis paper critically reviewed the progress done in the research and development of the hydrothermal

Keywords： lignocellulosic waste     hydrothermal conversion     separate dissolution     asynchronous hydrolysis     mechanism    

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Nitrogen distribution in the products from the hydrothermal liquefaction of sp. and sp.

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6,   Pages 985-995 doi: 10.1007/s11705-021-2126-y

Abstract: The high contents of nitrogen-containing organic compounds in biocrude obtained from hydrothermal liquefactionIn summary, a brief reaction map was proposed to describe the nitrogen pathway during microalgae hydrothermal

Keywords： microalgae     hydrothermal liquefaction     biocrude     nitrogen distribution    

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ASSESSMENT OF HEAVY METALS IN HYDROCHAR PRODUCED BY HYDROTHERMAL CARBONIZATION OF DAIRY MANURE

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 3,   Pages 437-447 doi: 10.15302/J-FASE-2023507

Abstract:

● Content of heavy metals in hydrochar varies considerably, from 50% to 100%.

Keywords： heavy metals     dairy manure     hydrochar     hydrothermal carbonization     waste management    

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Ti incorporation in MCM-41 mesoporous molecular sieves using hydrothermal synthesis

Shengping WANG, Changqing MA, Yun SHI, Xinbin MA

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 1,   Pages 95-103 doi: 10.1007/s11705-014-1405-2

Abstract: Titanium-containing mesoporous materials (Ti-MCM-41) were obtained by hydrothermal synthesis.

Keywords： Ti-MCM-41     mesoporous molecular sieve     acid sites     transesterification     hydrothermal synthesis    

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Underlying mechanism of the hydrothermal instability of Cu

Nadeen Al-Janabi,Abdullatif Alfutimie,Flor R. Siperstein,Xiaolei Fan

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 1,   Pages 103-107 doi: 10.1007/s11705-015-1552-0

Abstract: Water induced decomposition of Cu (BTC) (BTC= benzene-1,3,5-tricarboxylate) metal-organic framework (MOF) was studied using dynamic water vapour adsorption. Small-angle X-ray scattering, Fourier transform infrared spectroscopy and differential scanning calorimetry analyses revealed that the underlying mechanism of Cu (BTC) MOF decomposition under humid streams is the interpenetration of water molecules into Cu-BTC coordination to displace organic linkers (BTC) from Cu centres.

Keywords： hydrothermal stability     metal-organic framework (MOF)     open metal sites (OMSs)     dynamic water vapour adsorption    

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Effects of metal ions on the morphology of calcium sulfate hemihydrate whiskers by hydrothermal method

Tianjie Liu, Hao Fan, Yanxia Xu, Xingfu Song, Jianguo Yu

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 4,   Pages 545-553 doi: 10.1007/s11705-017-1665-8

Abstract: ion concentrations on the crystal morphology of calcium sulfate hemihydrate whiskers formed via a hydrothermal

Keywords： metal ions     morphology     calcium sulfate hemihydrate whiskers     hydrothermal method     selective adsorption    

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Hydrothermal treatment of MSWI fly ash for simultaneous dioxins decomposition and heavy metal stabilization

Jinlong XIE, Yuyan HU, Dezhen CHEN, Bin ZHOU,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 1,   Pages 108-115 doi: 10.1007/s11783-010-0013-8

Abstract: Researches on the hydrothermal treatment of municipal solid waste incineration (MSWI) fly ash were conducteddecomposing polychlorinated dibenzo-dioxins (PCDDs) and polychlorinated dibenzo-furans (PCDFs) during hydrothermalA hydrothermal reactor was set up by mixing raw MSWI fly ash or the pre-treated fly ash with water andresulted from the highly chlorinated congeners losing their chlorine atoms and being degraded during the hydrothermalGood stabilization of heavy metals was also obtained in the same hydrothermal process especially when

Keywords： incineration (MSWI)     fly ashes     polychlorinated dibenzo-dioxins (PCDDs)     polychlorinated dibenzo-furans (PCDFs)     hydrothermal    

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Preparation and characterization of ZnO/ZnS hybrid photocatalysts via microwave-hydrothermal method

ZHAO Jinglian, WANG Xinping, ZHAO Liang

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 4,   Pages 415-420 doi: 10.1007/s11783-008-0056-2

Abstract: The photocatalysts were obtained via microwave-hydrothermal crystallization with the help of sodium citrate

Keywords： large-scale     hexagonal     misdistribution     characterization     nanocomposite    

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Efficient hydrothermal deoxygenation of methyl palmitate to diesel-like hydrocarbons on carbon encapsulated

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 2,   Pages 139-155 doi: 10.1007/s11705-022-2217-4

Abstract: prepared by the one-pot extended Stöber method followed by carbonization and tested for in-situ hydrothermalDuring the in-situ hydrothermal deoxygenation, the synergism between Ni and Sn favors palmiticcarbon confinement that effectively suppresses the sintering and loss of metal particles under harsh hydrothermal

Keywords： extended Stöber method     carbon encapsulated Ni–Sn intermetallic compounds     confinement     in-situ hydrothermal    

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Hydrogel photocatalysts for efficient energy conversion and environmental treatment

Frontiers in Energy 2021, Volume 15, Issue 3,   Pages 577-595 doi: 10.1007/s11708-021-0756-x

Abstract: Moreover, current applications of hydrogel photocatalysts in energy conversion and environmental remediation

Keywords： hydrogel     photocatalysts     energy conversion     environmental treatment    

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Biological conversion pathways of sulfate reduction ammonium oxidation in anammox consortia

Zhen Bi, Deqing Wanyan, Xiang Li, Yong Huang

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 3, doi: 10.1007/s11783-019-1217-1

Abstract: AOB and AnAOB are mainly responsible for ammonium conversion.Heterotrophic sulfate reduction mainly contributed to sulfate conversion.Results obtained differed largely for the conversion mole ratios (ammonium/sulfate), and even the intermediateThus, the hypothesis of biological conversion pathways of ammonium and sulfate in anammox consortia isdifferent biomass proportions to verify the SRAO phenomena and identify possible pathways behind substrate conversion

Keywords： Anammox bacteria     Autotrophic     Biological conversion     Sulfate reducing ammonium oxidation (SRAO)    

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Simplistic hydrothermal synthesis approach for fabricating photoluminescent carbon dots and its potential

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 5,   Pages 536-547 doi: 10.1007/s11705-022-2239-y

Abstract: Herein, we report the simple hydrothermal method to fabricate photoluminescent doped carbon quantum dots

Keywords： carbon dots     fluorescence     heavy metal sensing     practical application     photoluminescence    

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Sustainable conversion regenerated cellulose into cellulose oleate by sonochemistry

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 8,   Pages 1096-1108 doi: 10.1007/s11705-023-2317-9

Abstract: Derivatization has great potential for the high-value utilization of cellulose by enhancing its processability and functionality. However, due to the low reactivity of natural cellulose, it remains challenging to rapidly prepare cellulose derivatives with high degrees of substitution. The “cavitation effect” of ultrasound can reduce the particle size and crystalline index of cellulose, which provides a possible method for preparing cellulose derivatives. Herein, a feasible method was proposed for efficiently converting regenerated cellulose to cellulose oleate with the assistance of ultrasonic treatment. By adjusting the reaction conditions including ultrasonic intensity, feeding ratios of oleic acid, reaction time, and reaction solvent, a series of cellulose oleates with degrees of substitution ranging from 0.37 to 1.71 were synthesized. Additionally, the effects of different reaction conditions on the chemical structures, crystalline structures, and thermal behaviors were investigated thoroughly. Cellulose oleates with degrees of substitution exceeding 1.23 exhibited amorphous structures and thermoplasticity with glass transition temperatures at 159.8 to 172.6 °C. This study presented a sustainable and practicable method for effectively derivatizing cellulose.

Keywords： regenerated cellulose     cellulose oleate     sonochemistry     degree of substitution     thermoplasticity    

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Dynamic contribution of variable-speed wind energy conversion system in system frequency regulation

Yajvender Pal VERMA, Ashwani KUMAR

Frontiers in Energy 2012, Volume 6, Issue 2,   Pages 184-192 doi: 10.1007/s11708-012-0185-y

Abstract: Frequency regulation in a generation mix having large wind power penetration is a critical issue, as wind units isolate from the grid during disturbances with advanced power electronics controllers and reduce equivalent system inertia. Thus, it is important that wind turbines also contribute to system frequency control. This paper examines the dynamic contribution of doubly fed induction generator (DFIG)-based wind turbine in system frequency regulation. The modified inertial support scheme is proposed which helps the DFIG to provide the short term transient active power support to the grid during transients and arrests the fall in frequency. The frequency deviation is considered by the controller to provide the inertial control. An additional reference power output is used which helps the DFIG to release kinetic energy stored in rotating masses of the turbine. The optimal speed control parameters have been used for the DFIG to increases its participation in frequency control. The simulations carried out in a two-area interconnected power system demonstrate the contribution of the DFIG in load frequency control.

Keywords： doubly fed induction generator (DFIG)     load frequency control     inertial control     wind energy conversion    

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Title Author Date Type Operation

Two-step hydrothermal conversion of biomass waste to humic acid using hydrochar as intermediate

Journal Article

Research progress on hydrothermal dissolution and hydrolysis of lignocellulose and lignocellulosic waste

Yan ZHAO, Wenjing LU, Jiajun CHEN, Xiangfeng ZHANG, Hongtao WANG

Journal Article

Nitrogen distribution in the products from the hydrothermal liquefaction of sp. and sp.

Journal Article

ASSESSMENT OF HEAVY METALS IN HYDROCHAR PRODUCED BY HYDROTHERMAL CARBONIZATION OF DAIRY MANURE

Journal Article

Ti incorporation in MCM-41 mesoporous molecular sieves using hydrothermal synthesis

Shengping WANG, Changqing MA, Yun SHI, Xinbin MA

Journal Article

Underlying mechanism of the hydrothermal instability of Cu

Nadeen Al-Janabi,Abdullatif Alfutimie,Flor R. Siperstein,Xiaolei Fan

Journal Article

Effects of metal ions on the morphology of calcium sulfate hemihydrate whiskers by hydrothermal method

Tianjie Liu, Hao Fan, Yanxia Xu, Xingfu Song, Jianguo Yu

Journal Article

Hydrothermal treatment of MSWI fly ash for simultaneous dioxins decomposition and heavy metal stabilization

Jinlong XIE, Yuyan HU, Dezhen CHEN, Bin ZHOU,

Journal Article

Preparation and characterization of ZnO/ZnS hybrid photocatalysts via microwave-hydrothermal method

ZHAO Jinglian, WANG Xinping, ZHAO Liang

Journal Article

Efficient hydrothermal deoxygenation of methyl palmitate to diesel-like hydrocarbons on carbon encapsulated

Journal Article

Hydrogel photocatalysts for efficient energy conversion and environmental treatment

Journal Article

Biological conversion pathways of sulfate reduction ammonium oxidation in anammox consortia

Zhen Bi, Deqing Wanyan, Xiang Li, Yong Huang

Journal Article

Simplistic hydrothermal synthesis approach for fabricating photoluminescent carbon dots and its potential

Journal Article

Sustainable conversion regenerated cellulose into cellulose oleate by sonochemistry

Journal Article

Dynamic contribution of variable-speed wind energy conversion system in system frequency regulation

Yajvender Pal VERMA, Ashwani KUMAR

Journal Article