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Selectively structural fractionation and economical-functionality conversion of lignocellulosic biomass

Chen Hongzhang,Qiu Weihua and Wang Lan

Strategic Study of CAE 2014, Volume 16, Issue 3,   Pages 27-36

Abstract:

In this paper，an innovative biomass- refining path called“selective- fractionation and economical-functionalityestablished to prove the feasibility，reasonability and reliability of“selectivefractionation and economical- functionality”.In conclusion，“selective- fractionation and economical-functionality”of lignocellulosic materials

Keywords： biorefining     heterogeneity of raw material     selective-fractionation and economical-functionality     industrialized    

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Continuous size fractionation of magnetic nanoparticles by using simulated moving bed chromatography

Carsten-Rene Arlt, Dominik Brekel, Stefan Neumann, David Rafaja, Matthias Franzreb

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 5,   Pages 1346-1355 doi: 10.1007/s11705-021-2040-3

Abstract: The size fractionation of magnetic nanoparticles is a technical problem, which until today can only beUsing magnetic chromatography, we show a promising method for fractionation of magnetic nanoparticlesSince the strength of this interaction is related to particle size, the principle is suitable for size fractionationeasy scalability of continuous chromatography, the process is a promising approach for the efficient fractionation

Keywords： magnetic chromatography     simulated moving bed chromatography     magnetic nanoparticles     size fractionation    

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Can energy storage make off-grid photovoltaic hydrogen production system more economical?

Frontiers of Engineering Management   Pages 672-694 doi: 10.1007/s42524-022-0245-x

Abstract: Under the ambitious goal of carbon neutralization, photovoltaic (PV)-driven electrolytic hydrogen (PVEH) production is emerging as a promising approach to reduce carbon emission. Considering the intermittence and variability of PV power generation, the deployment of battery energy storage can smoothen the power output. However, the investment cost of battery energy storage is pertinent to non-negligible expenses. Thus, the installation of energy-storage equipment in a PVEH system is a complex trade-off problem. The primary goals of this study are to compare the engineering economics of PVEH systems with and without energy storage, and to explore time nodes when the cost of the former scenario can compete with the latter by factoring the technology learning curve. The levelized cost of hydrogen (LCOH) is a widely used economic indicator. Represented by seven areas in seven regions of China, results show that the LCOH with and without energy storage is approximately 22.23 and 20.59 yuan/kg in 2020, respectively. In addition, as technology costs drop, the LCOH of a PVEH system with energy storage will be less than that without energy storage in 2030.

Keywords： hydrogen     off-grid photovoltaic     energy storage     LCOH     engineering economics    

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Variation in humic and fulvic acids during thermal sludge treatment assessed by size fractionation, elementary

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: Thermal pretreatment can be applied to sludge anaerobic digestion or dewatering. To analyze the variation in humic substances during thermal sludge treatment, sludge humic and fulvic acids were extracted before and after 30-min thermal treatment at 180°C, and then their contents, molecular weight distributions, elementary compositions, and spectral characteristics were compared. The results showed that the total contents of humic and fulvic acids in the sludge almost remained constant during thermal treatment, but 35% of humic and fulvic acids were dissolved from the sludge solids. Moreover, both humic and fulvic acids were partly decomposed and 32% of humic acids were converted to fulvic acids. The median value of the molecular weights of humic acids decreased from 81 to 41 kDa and that of fulvic acids decreased from 15 to 2 kDa. Besides the reduction in molecular size, the chemical structures of humic and fulvic acids also exhibited a slight change, i.e. some oxygen functional groups disappeared and aromatic structures increased after thermal sludge treatment.

Keywords： sludge     thermal treatment     humic acids     fulvic acids    

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Tank-dependence of the functionality and network differentiation of activated sludge community in a full-scale

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 3, doi: 10.1007/s11783-023-1636-x

Abstract:

● Environmental parameters affected functional bacteria and network associations.

Keywords： Activated sludge     Bacterial community     Tank-dependence     Network association     Functional bacteria    

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Aerodynamic challenges in span length of suspension bridges

XIANG Haifan, GE Yaojun

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2,   Pages 153-162 doi: 10.1007/s11709-007-0016-0

Abstract: of extreme bridge spans is firstly discussed according to horizontal clearances for navigation and economical

Keywords： requirement     reasonable limitation     challenge     particular     economical construction    

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Fused structures for safer and more economical constructions

Yu-Fei WU, Ying-Wu ZHOU, Biao HU, Xiaoxu HUANG, Scott SMITH

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 1-9 doi: 10.1007/s11709-019-0541-7

Abstract: safer failure mode is enforced, a fused structure requires a smaller safety factor thus leading to more economical

Keywords： fused structures     structural fuse     fiber-reinforced polymer     concrete    

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Preparation of adsorptive nanoporous membrane using powder activated carbon: Isotherm and thermodynamic studies

Majid Peyravi

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 4,   Pages 673-687 doi: 10.1007/s11705-019-1800-9

Abstract: Adsorptive polyethesulfone (PES) membranes were prepared by intercalation of powder activated carbon (PAC) with and without functionalization. Accordingly, PAC was aminated with 1,5-diamino-2-methylpentane, and the physicochemical properties of the functionalized PAC were analyzed. Intercalation of PAC within the PES scaffold changed the porosity and mean pore size of the aminated membrane (AC-NH ) from 52.6% to 92.5% and from 22.6 nm to 3.5 nm, respectively. The effect of temperature on the performance of the modified membranes was monitored by the flux and chemical oxygen demand (COD) removal of leachate. At ambient temperature, the COD removal of the neat, AC-containing, and AC-NH membranes was 47%, 52%, and 58.5%, respectively. A similar increment was obtained for the membrane flux, which was due to the synergistic effect of the high porosity and large number of hydrophilic functional groups. The experimental leachate adsorption data were analyzed by Langmuir, Freundlich, and Dubinin- Radushkevich isotherm models. For all membranes, the significant thermodynamic parameters ( , , and ) were calculated and compared. The isosteric heat of adsorption was lower than 80 kJ∙mol , indicating that the interaction between the membranes and the leachate is mainly physical, involving weak van der Waals forces.

Keywords： amine functionality     nanoporous membrane     adsorption isotherm     thermodynamic parameters     landfill leachate    

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Recent advances in selective acetylene hydrogenation using palladium containing catalysts

Alan J. McCue, James A. Anderson

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 2,   Pages 142-153 doi: 10.1007/s11705-015-1516-4

Abstract: Recent advances with Pd containing catalysts for the selective hydrogenation of acetylene are described

Keywords： acetylene     ethylene     selective hydrogenation     palladium     bimetallic    

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Preparation of polysulfone-based block copolymer ultrafiltration membranes by selective swelling and

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 5,   Pages 745-754 doi: 10.1007/s11705-021-2038-x

Abstract: Selective swelling of block copolymers of polysulfone-b-poly(ethylene glycol) is an emerging strategyHerein, we prepared nanoporous polysulfone-b-poly(ethylene glycol) ultrafiltration membranes by selectiveSelective swelling was performed on the obtained block copolymer structures in the solvent pair of ethanol

Keywords： block copolymers     selective swelling     ultrafiltration     CaCO3 nanoparticles     sacrificial nanofillers    

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Highly efficient and selective removal of vanadium from tungstate solutions by microbubble floating-extraction

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 5,   Pages 581-593 doi: 10.1007/s11705-022-2235-2

Abstract: Selective separation of dissolved tungsten and vanadium is of great significance for the utilizationIn this work, selective removal of vanadium from tungstate solutions via microbubble floating-extraction

Keywords： tungsten     vanadium     selective separation     reagent mineralization     microbubble floating-extraction    

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Mechanistic insights into the selective photocatalytic degradation of dyes over TiO/ZSM-11

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 8, doi: 10.1007/s11783-023-1701-5

Abstract:

● TiO2/ZSM-11 was prepared by a facile solid state dispersion method.

Keywords： Selective dye degradation     Photocatalysis     TiO2     ZSM-11     Chemisorption    

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Porous ultrathin-shell microcapsules designed by microfluidics for selective permeation and stimuli-triggered

Frontiers of Chemical Science and Engineering   Pages 1643-1650 doi: 10.1007/s11705-022-2201-z

Abstract: Generally, microcapsules with solid shells lack selective permeation and only exhibit a simple releasewater-in-oil-in-water double emulsions as templates and design porous ultrathin-shell microcapsules for selectiveThe porous ultrathin-shell microcapsules exhibit excellent properties, including tunable size, selective

Keywords： microcapsule     emulsion     microfluidics     selective permeation     stimuli-triggered release    

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Highly selective and green recovery of lithium ions from lithium iron phosphate powders with ozone

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 6,   Pages 749-758 doi: 10.1007/s11705-022-2261-0

Abstract: Here, we describe a selective recovery process that can achieve economically efficient recovery and anAdjusting the acid concentration and amount of oxidant enables selective recovery of lithium ions.temperature on the leaching of lithium and iron are comprehensively explored, and the mechanism of selective

Keywords： lithium iron phosphate powder     stoichiometric number     selective leaching     lithium recovery    

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Shape selective catalysis in methylation of toluene: Development, challenges and perspectives

Jian Zhou, Zhicheng Liu, Yangdong Wang, Dejin Kong, Zaiku Xie

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 1,   Pages 103-112 doi: 10.1007/s11705-017-1671-x

Abstract: “molecular engineering” process to realize directional conversion of toluene/methanol molecules by selectivehistory of methylation catalysts and reaction mechanism, and the effect of reaction condition in -selectiveIf constructing -xylene as the single target product, the major challenge to develop -selective toluene

Keywords： shape selective catalysis     methylation of toluene    

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Title Author Date Type Operation

Selectively structural fractionation and economical-functionality conversion of lignocellulosic biomass

Chen Hongzhang,Qiu Weihua and Wang Lan

Journal Article

Continuous size fractionation of magnetic nanoparticles by using simulated moving bed chromatography

Carsten-Rene Arlt, Dominik Brekel, Stefan Neumann, David Rafaja, Matthias Franzreb

Journal Article

Can energy storage make off-grid photovoltaic hydrogen production system more economical?

Journal Article

Variation in humic and fulvic acids during thermal sludge treatment assessed by size fractionation, elementary

Yuning YANG,Huan LI,Jinyi LI

Journal Article

Tank-dependence of the functionality and network differentiation of activated sludge community in a full-scale

Journal Article

Aerodynamic challenges in span length of suspension bridges

XIANG Haifan, GE Yaojun

Journal Article

Fused structures for safer and more economical constructions

Yu-Fei WU, Ying-Wu ZHOU, Biao HU, Xiaoxu HUANG, Scott SMITH

Journal Article

Preparation of adsorptive nanoporous membrane using powder activated carbon: Isotherm and thermodynamic studies

Majid Peyravi

Journal Article

Recent advances in selective acetylene hydrogenation using palladium containing catalysts

Alan J. McCue, James A. Anderson

Journal Article

Preparation of polysulfone-based block copolymer ultrafiltration membranes by selective swelling and

Journal Article

Highly efficient and selective removal of vanadium from tungstate solutions by microbubble floating-extraction

Journal Article

Mechanistic insights into the selective photocatalytic degradation of dyes over TiO/ZSM-11

Journal Article

Porous ultrathin-shell microcapsules designed by microfluidics for selective permeation and stimuli-triggered

Journal Article

Highly selective and green recovery of lithium ions from lithium iron phosphate powders with ozone

Journal Article

Shape selective catalysis in methylation of toluene: Development, challenges and perspectives

Jian Zhou, Zhicheng Liu, Yangdong Wang, Dejin Kong, Zaiku Xie

Journal Article