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Locally Enhanced Flow and Electric Fields Through a Tip Effect for Efficient Flow‑Electrode Capacitive Deionization

Nano-Micro Letters 2025年第2期17卷 1-17页

作者： Ziquan Wang Xiangfeng Chen Yuan Zhang Jie Ma Zhiqun Lin Amor Abdelkader Maria‑Magdalena Titirici Libo Deng College of Chemistry and Environmental engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Research Center for Environmental Functional Materials College of Environmental Science and EngineeringTongji University1239 Siping RoadShanghai 200092People’s Republic of China department of chemical and biomolecular engineering National University of SingaporeSingapore 117585Singapore department of engineering Faculty of Science and TechnologyBournemouth UniversityTalbot CampusFern BarrowPooleEngland BH125BBUK Institut de Chimie de Nice UniversitéCôte d’AzurUMR CNRS 727228 Av.Valrose06108 NiceFrance department of chemical engineering Imperial College LondonSouth Kensington CampusExhibition RdLondon SW72AZUK

Low-electrode capacitive deionization(FCDI)is an emerging desalination technology with great potential for removal and/or recycling ions from a range of ***,it still suffers from inefficient charge transfer and ion transport kinetics due to weak turbulence and low electric intensity in flow electrodes,both restricted by the current ***,a new tip-array current collector(designated as T-CC)was developed to replace the conventional planar current collectors,which intensifies both the charge transfer and ion transport *** effects of tip arrays on flow and electric fields were studied by both computational simulations and electrochemical impedance spectroscopy,which revealed the reduction of ion transport barrier,charge transport barrier and internal *** the voltage increased from 1.0 to 1.5 and 2.0 V,the T-CC-based FCDI system(T-FCDI)exhibited average salt removal rates(ASRR)of 0.18,0.50,and 0.89μmol cm^(-2) min^(-1),respectively,which are 1.82,2.65,and 2.48 folds higher than that of the conventional serpentine current collectors,and 1.48,1.67,and 1.49 folds higher than that of the planar current ***,with the solid content in flow electrodes increased from 1 to 5 wt%,the ASRR for T-FCDI increased from 0.29 to 0.50μmol cm^(-2) min^(-1),which are 1.70 and 1.67 folds higher than that of the planar current ***,a salt removal efficiency of 99.89%was achieved with T-FCDI and the charge efficiency remained above 95%after 24 h of operation,thus showing its superior long-term stability.

关键词： Flow-electrode Capacitive deionization Current collector Tip effect Desalination

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Mo_(2)B_(2)O_(2) MBene for Efficient Electrochemical CO Reduction to C_(2) chemicals:Computational Exploration

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Energy & Environmental Materials 2024年第6期7卷 342-350页

作者： Bikun Zhang Jianwen Jiang department of chemical and biomolecular engineering National University of SingaporeSingapore 117576Singapore

Emerging as a new class of two-dimensional materials with atomically thin layers,MBenes have great potential for many important applications such as energy storage and *** mitigating carbon footprint,there has been increasing interest in CO_(2)/CO conversion on MBenes,but mostly focused on C_(1) products.C^(2+) chemicals generally possess higher energy densities and wider applications than C_(1) ***,C–C coupling is technically challenging because of high energy requirement and currently few catalysts are suited for this ***,we explore electrochemical CO reduction reaction to C_(2) chemicals on Mo_(2)B_(2)O_(2) MBene via density-functional theory ***,the most favorable CO–COH coupling is revealed to be a spontaneous and barrierless process,making Mo_(2)B_(2)O_(2) an efficient catalyst for C–C *** C_(1) and C_(2) chemicals,ethanol is predicted to be the primary ***,by charge and bond analysis,it is unraveled that there exist significantly more unbonded electrons in the C atom of intermediate*COH than other C_(1) intermediates,which is responsible for the facile C–C *** an atomic scale,this work provides microscopic insight into C–C coupling process and suggests Mo_(2)B_(2)O_(2) a promising catalyst for electrochemical CO reduction to C_(2) chemicals.

关键词： C_(2) chemicals C-C coupling density-functional theory MBene Mo2B2O2

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engineering microbes to overproduce natural products as agrochemicals

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Synthetic and Systems Biotechnology 2023年第1期8卷 79-85页

作者： Smaranika Panda Kang Zhou department of chemical and biomolecular engineering National University of SingaporeSingapore

Current agricultural practices heavily rely on the excessive application of synthetic pesticides and fertilizers to meet the food demands of the increasing global *** practice has several drawbacks including its negative impact on the environment and human ***,the use of natural products has gained interest as alternatives to these synthetic agrochemicals due to their selective working mechanisms and *** order to efficiently produce these natural agrochemicals,engineering microorganisms is emerging as an increasingly viable approach,and it is anticipated that it will have a significant market share in the near *** approach manipulates the metabolism of microbes to manufacture the desired natural compounds from low-cost starting *** review discusses recent examples of this *** produced natural products can serve as biopesticides or plant growth regulators for the sustainable improvement of plant growth and disease *** challenges in further developing these strategies are also discussed.

关键词： Agrochemicals Fermentation Biopesticides Plant hormones Metabolic engineering

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An integrated approach to improve the performance of lean–electrolyte lithium–sulfur batteries

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Journal of Energy Chemistry 2022年第4期31卷 585-592页

作者： Hualin Ye Jianguo Sun Yun Zhao Jim Yang Lee department of chemical and biomolecular engineering National University of Singapore119260Singapore department of Mechanical engineering National University of Singapore117575Singapore

While the sulfur conversion reaction kinetics in Li–S batteries is nowadays improved by the use of appropriate electrocatalysts,it remains a challenge for the batteries to perform well under the lean electrolyte condition where polysulfide shuttle,electrode passivation and the loss of electrolyte due to side reactions,are *** challenges are addressed in this study by the tandem use of a polysulfide conversion catalyst and a redox–targeting mediator in a gel sulfur ***,the gel cathode reduces the polysulfide mobility and hence the polysulfide shuttle and the passivation of the lithium anode by the crossover *** redox mediator restrains the deposition of inactive sulfur species in the cathode thereby enabling the Fe–N and Co–N co–doped carbon catalyst to prolong its catalytic ***,the integrated catalytic system is able to increase the discharge capacity of high–loading (6.8 mg cm^(-2)) lean–electrolyte (4.0μL mg^(-1)) Li–S batteries from~630 to~1316 m Ah g^(-1),concurrently with an improvement of the cycle life (600 cycles with 46%capacity retention at 1.0 m A cm^(-2)).Redox mediator assisted catalysis in a gel cathode is therefore an effective strategy to extend the application of the sulfur conversion catalyst in lean electrolyte Li–S batteries.

关键词： Redox mediators Gel electrolytes Polysulfide catalysis Lean electrolyte Lithium–sulfur batteries

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Conjugated polyelectrolytes for label-free visual detection of heparin

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Science China Chemistry 2011年第4期54卷 567-574页

作者： PU KanYi ZHAN RuoYu LIANG Jing LIU Bin department of chemical and biomolecular engineering National University of SingaporeSingapore 117576Singapore

Conjugated polyelectrolytes (CPEs),with electron-delocalized backbones and charged ionic side chains,are unique sensory materials for the construction of optical *** this feature article,CPE-based visual detection of heparin is *** CPE-based heparin probes,including ratiometric,light-up and colormetric probes,are discussed in terms of molecular design,detection selectivity and quantification *** work summarized here provides fundamental guidelines for CPE-based label-free visual sensing.

关键词： conjugated polyelectrolyte heparin fluorescence resonance energy transfer sensor

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ANTIBACTERIAL POLY(D,L-LACTIDE)(PDLLA)FIBROUS MEMBRANES MODIFIED WITH QUATERNARY AMMONIUM MOIETIES

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Chinese Journal of Polymer Science 2010年第4期28卷 581-588页

作者：李新松 K.G.Neoh School of Chemistry and chemical engineering Southeast University department of chemical and biomolecular engineering National University of Singapore

Antibacterial poly（D,L-lactide）（PDLLA） fibrous membranes were developed via electrospinning, followed by surface modification which involved plasma pretreatment, UV-induced graft copolymerization of 4-vinylpyridine （4VP） and quaternization of the grafted pyridine groups with hexylbromide. The success of modification with quaternized pyridinium groups on the PDLLA fibrous membranes was ascertained by X-ray photoelectron spectroscopy （XPS）. The antibacterial activities of these membranes were assessed against Gram-positive Staphylococcus aureus （S. aureus） and Gram-negative Escherichia coli （E. coli）. The PDLLA fibrous membranes modified with quatemized pyridinium groups showed antibacterial efficiency against both bacteria as high as 99.999%. The results demonstrated that the antibacterial activity was based on the interaction of the positive charge of pyridinium group and negatively charged cell membrane of bacteria, resulting in loss of membrane permeability and cell leakage.

关键词： Poly(D,L-lactide) Antibacterial Electrospinning Surface modification

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Smart systems engineering contributing to an intelligent carbon-neutral future: opportunities, challenges, and prospects

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Frontiers of chemical Science and engineering 2022年第6期16卷 1023-1029页

作者： Xiaonan Wang Jie Li Yingzhe Zheng Jiali Li department of chemical engineering Tsinghua UniversityBeijing 100084China department of chemical&biomolecular engineering Faculty of EngineeringNational University of SingaporeSingapore 117585Singapore

This communication paper provides an overview of multi-scale smart systems engineering(SSE)approaches and their applications in crucial domains including materials discovery,intelligent manufacturing,and environmental management.A major focus of this interdisciplinary field is on the design,operation and management of multi-scale systems with enhanced economic and environmental *** emergence of big data analytics,internet of things,machine learning,and general artificial intelligence could revolutionize next-generation research,industry and society.A detailed discussion is provided herein on opportunities,challenges,and future directions of SSE in response to the pressing carbon-neutrality targets.

关键词： machine learning modeling material industrial applications environment

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Shell biorefinery: A comprehensive introduction

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Green Energy & Environment 2018年第4期3卷 318-327页

作者： Max J.Hlsey department of chemical and biomolecular engineering National University of Singapore

Biomass refinery is considered to be a key technology in the 21 st century due to the importance of the sustainable production of various bioderived fuels and fine chemicals. Besides the synthesis of oxygen-containing chemicals mainly from lignocellulosic biomass, nitrogencontaining chemicals belong to some of the most important commodity and fine chemicals. In this introductory short review, the main similarities and difficulties between petroleum oil-and biorefinery will be discussed and future challenges will be highlighted. As a particular example, recent developments in the shell biorefinery – the utilization of shell waste – will be reviewed. Particular emphasis will be placed on the structure of shell biomass, the current and emerging fractionation methods and the conversion of chitin and chitosan to various heteroatomcontaining chemicals. This review is meant to provide an introduction to beginners in the field of biorefinery as well as a comprehensive discussion of recent proceedings in the field of shell biorefinery. An outlook on the future potential and challenges will be given.

关键词： Shell biorefinery

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Nitrogen-doped graphene nanosheets as reactive water purification membranes

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Nano Research 2016年第7期9卷 1983-1993页

作者： Yanbiao Liu Ling Yu Choon Nam Ong Jianping Xie NUS Environmental Research Institute National University of Singapore 117411 Singapore department of chemical and biomolecular engineering National University of Singapore 117585 Singapore

Oxidation of organic pollutants by sulfate radicals produced via activation of persulfate has emerged as a promising advanced oxidation technology to address various challenging environmental issues. The development of an effective, environmentally-friendly, metal-free catalyst is the key to this technology. Additionally, a supported catalyst design is more advantageous than conventional suspended powder catalysts from the point of view of mass transfer and practical engineering applications （e.g. post-use separation）. In this study, a metal-free N-doped reduced graphene oxide （N-rGO） catalyst was prepared via a facile hydrothermal method. N-rGO filters were then synthesized by facile vacuum filtration, such that water can flow through nanochannels within the filters. Various advanced characterization techniques were employed to obtain structural and compositional information of the as-synthesized N-rGO filters. An optimized phenol oxidative flux of 0.036 ＋_ 0.002 mmol.h ~ was obtained by metal-flee catalytic activation of persulfate at an influent persulfate concentration of 1.0 mmol-L 1 and filter weight of 15 rag, while a N-free rGO filter demonstrated negligible phenol oxidation capability under similar conditions. Compared to a conventional batch system, the flow-through design demonstrates obviously enhanced oxidation kinetics （0.036 vs. 0.010 retool-h-I）, mainly due to the liquid flow through the filter leading to convection-enhanced transfer of the target molecule to the filter active sites. Overall, the results exemplified the advantages of organic compound removal by catalytic activation of persulfate using a metal-free catalyst in flow- through mode, and demonstrated the potential of N-rGO filters for practical environmental applications.

关键词： persulfate activation nitrogen-doped graphene phenol oxidation convective flow batch system

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Multi-functional forward osmosis draw solutes for seawater desalination

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Chinese Journal of chemical engineering 2016年第1期24卷 23-30页

作者： Dieling Zhao Shucheng Chen Chun Xian Guo Qipeng Zhao Xianmao Lu department of chemical & biomolecular engineering National University of Singapore

Forward osmosis(FO), as one of the emerging desalination technologies, has the potential to produce fresh water from a variety of water sources by utilizing the osmotic pressure gradient across a semi-permeable *** solution, as an essential component of any FO process, can extract water molecules from seawater or wastewater. An ideal draw solution should meet three essential requirements, namely high osmotic pressure, low reverse flux, and facile regeneration mechanism. The selection of proper draw solutes is especially critical for an energy-efficient FO process since the energy consumption mostly arises from the separation or regeneration of the draw solution. Recently, we developed a few multi-functional FO draw solutes, mainly aiming to enhance the FO water flux and to explore facile re-concentration methods. This review summarizes these draw solutes,including Na^+_- functionalized carbon quantum dots, thermoresponsive copolymers, hydrophilic magnetic nanoparticles, and thermoresponsive magnetic nanoparticles.

关键词： Forward osmosis Draw solution Seawater desalination Stimuli-responsive

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