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In-situ construction of abundant active centers on hierarchically porous carbon electrode toward high-performance phosphate electrosorption: Synergistic effect of electric field and capture sites

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Green Energy & Environment 2024年第1期9卷 126-137页

作者： Peng Zhang Fukuan Li Mingming He Silu Huo Xueli Zhang Benqiang Cen Dezhi Fang Kexun Li Hao Wang College of Environmental Science and Engineering Nankai UniversityTianjin300350China MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution ControlTianjin Key Laboratory of Environmental Technology for Complex Trans-Media PollutionNankai UniversityTianjin300350China State Key Laboratory of Simulation and Regulation of Water Cycles in River Basins China Institute of Water Resources and Hydropower ResearchBeijing100038China

Phosphate removal is crucial for eutrophication control and water quality improvement.Electro-assisted adsorption,an eco-friendly elec-trosorption process,exhibited a promising potential for wastewater treatment.However,there are few works focused on phosphate electro-sorption,and reported electrodes cannot attach satisfactory removal capacities and rates.Herein,electro-assisted adsorption of phosphate via in-situ construction of La active centers on hierarchically porous carbon(LaPC)has been originally demonstrated.The resulted LaPC composite not only possessed a hierarchically porous structure with uniformly dispersed La active sites,but also provided good conductivity for interfacial electron transfer.The LaPC electrode achieved an ultrahigh phosphate electrosorption capability of 462.01 mg g^(-1) at 1 V,outperforming most existing electrodes.The superior phosphate removal performance originates from abundant active centers formed by the coupling of electricﬁeld and capture sites.Besides,the stability and selectivity toward phosphate capture were maintained well even under comprehensive conditions.Moreover,a series of kinetics and isotherms models were employed to validate the electrosorption process.This work demonstrates a deep understanding and promotes a new level of phosphate electrosorption.

关键词： Electro-assisted adsorption electrosorption Phosphate removal Active centers MOF-derived carbon

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Treatment of Reused Comprehensive Wastewater in Iron and Steel Industry With electrosorption Technology

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Journal of Iron and Steel Research(International) 2011年第6期18卷 37-42页

作者： ZHANG Yun-hua GAN Fu-xing LI Meng WANG Di-hua HUANG Zhong-mai GAO Yun-peng Wuhan Iron and Steel (Group) Corp Wuhan 430080 Hubei China School of Resource and Environmental Science Wuhan University Wuhan 430072 Hubei China School of Civil Engineering and Architecture Wuhan University of Technology Wuhan 430070 Hubei China

electrosorption technology was used to treat the reused comprehensive wastewater from iron and steel industry. A problem of relatively high conductivity of wastewater which greatly affects the reuse was examined, and industrial test was conducted for the reused water advanced deionization and purification in a comprehensive wastewater treatment plant o{ WISCO [Wuhan Iron and Steel （Group） Corporation]. The results of the on-site in- dustrial test showed a satisfactory treatment performance for the reused water even at a flow rate of 1 000 L/h in a standard 500 L/h unit. The average conductivity decreased by about 70%, from 580--780 μS/cm to 100--350 μS/cm. The average removal efficiency of CI and Ca2＋ was about 75% and 68%, respectively, and CODcr of the treated wa- ter was also reduced in some degree while the pH value was almost unchanged. The energy consumption was as low as 0.6 kWh/t, which was remarkably superior to the conventional technologies. Therefore, it is entirely feasible that the novel eleetrosorption technology can be used in enhanced desalination and purification treatment of reused com- prehensive wastewater in iron and steel industry.

关键词： electrosorption desalination purification conductivity industrial reused water

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Multilayered graphene membrane as an experimental platform to probe nano-confined electrosorption

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Progress in Natural Science:Materials International 2012年第6期22卷 668-672页

作者： Chi Cheng Julia Uhe Xiaowei Yang Yanzhe Wu Dan Li Department of Materials Engineering Monash UniversityVIC Australia

Multilayered graphene membranes(MGMs) with different packing densities were prepared and used as electrodes for supercapacitors to probe nano-confined electrosorption in porous carbon materials.The electrosorption capacity of MGMs was measured against an increasing operation rate in a series of aqueous solutions of monovalent ions.The nano-confinement effect was found prominent when the microscopic pore structure of the MGMs was controlled to be comparable to the size of hydrated ions being tested.The electrosorption capacity was found highly dependent on the type of ions.This study highlights the great potential of using easily available and structurally tunable graphene membranes as a model system to investigate fundamental problems relating to energy storage,membrane separation and nanofiuidics.

关键词： Graphene electrosorption Ion transport Supercapacitor

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A novel 3D sp2 carbon-linked covalent organic framework as a platform for efficient electro-extraction of uranium

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Science China Chemistry 2023年第2期66卷 562-569页

作者： Cheng-Rong Zhang Jia-Xin Qi Wei-Rong Cui Xiao-Juan Chen Xin Liu Shun-Mo Yi Cheng-Peng Niu Ru-Ping Liang Jian-Ding Qiu State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang330013China College of Chemistry Nanchang UniversityNanchang330031China

Extracting uranium from seawater offers opportunities for sustainable nuclear fuel supply,but the task is quite challenging due to the low uranium concentration(~3 ppb)in seawater.Here,based on the Knoevenagel condensation reaction of aldehyde and acetonitrile groups,a novel stable sp^(2)carbon-linked three-dimensional covalent organic framework(3D COF),TFPM-PDANAO was prepared as a porous platform for uranium extraction from seawater.The TFPM-PDAN-AO designed with regular 3D pore channel of 7.12 A provides a specific channel for uranyl diffusion,which exhibits high selectivity and fast kinetics for uranium adsorption.Meanwhile,the superior stability and optoelectronic properties enable it an excellent porous platform for uranium electroextraction.By applying alternating voltages between-5 and 0 V,uranyl ions can rapidly migrate and enrich into the porous structure of TFPM-PDAN-AO,then inducing the electrodeposition of uranium compounds to form the charge neutral species(Na_(2)O(UO_(3)H_(2)O)x)with an unprecedentedly high adsorption capacity of 4,685 mg g^(-1).This work not only expands the application prospects of functionalized 3D COFs,but also provides a technical support for the electrodeposition adsorption of uranium from seawater.

关键词： three-dimension covalent organic framework uranium adsorption electrosorption

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Exploration of the Exceptional Capacitive Deionization Performance of CoMn_(2)O_(4) Microspheres Electrode

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Energy & Environmental Materials 2023年第1期6卷 119-128页

作者： Zhenzhen Liu Haibo Li Ningxia Key Laboratory of Photovoltaic Materials Ningxia UniversityYinchuan 750021China

The“battery type”inorganic electrode has been demonstrated the highly efficient sodium ion intercalation capacity for capacitive deionization.In this work,the CoMn_(2)O_(4)(CMO)microspheres with porous core-shell structure are prepared via co-precipitation and followed by annealing.The effects of annealing temperatures on the morphology,pore structure,valence state,and electrochemical behavior of CMO are explored.As electrode for capacitive deionization,the salt removal capacity and current efficiency of optimized AC||CMO device reaches up to 60.7 mg g^(−1) and 97.6%,respectively,and the capacity retention rate is 74.1%after 50 cycles.Remarkably,both the in-situ X-ray diffraction and ex-situ X-ray diffraction analysis features that the intercalation/de-intercalation of sodium ions are governed by(103)and(221)crystal planes of CMO.Accordingly,the density functional theory calculations realize that the adsorption energies of Na+onto(103)and(221)crystal planes are higher than that of any other crystal planes,manifesting the priorities in adsorption of sodium atoms.Furthermore,the X-ray photoelectron spectra of pristine and post-CMO electrode highlights that the reversible conversion of Mn^(3+)/Mn^(4+)couple is resulted from the intercalation/de-intercalation of Na^(+),while this is irreversible for Co^(3+)/Co^(2+)couple.Beyond that,the CMO electrode has been proven the selectivity removal of Na^(+) over K^(+)and Mg^(2+)in a multi-cation stream.

关键词： capacitive deionization desalination electrosorption microspheres

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Emerging electrochemical processes for materials recovery from wastewater: Mechanisms and prospects

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Frontiers of Environmental Science & Engineering 2020年第5期14卷 157-170页

作者： Lingchen Kong Xitong Liu Department of Civil and Environmental Engineering The George Washington University80022nd St NWWashingtonDC 20052USA

Recovering valuable materials from waste streams is critical to the transition to a circular economy with reduced environmental damages caused by resource extraction activities.Municipal and industrial wastewaters contain a variety of materials,such as nutrients(nitrogen and phosphorus),lithium,and rare earth elements,which can be recovered as value-added products.Owing to their modularity,convenient operation and control,and the non-requirement of chemical dosage,electrochemical technologies offer a great promise for resource recovery in small-scale,decentralized systems.Here,we review three emerging electrochemical technologies for materials recovery applications:electrosorption based on carbonaceous and intercalation electrodes,electrochemical redox processes,and electrochemically induced precipitation.We highlight the mechanisms for achieving selective materials recovery in these processes.We also present an overview of the advantages and limitations of these technologies,as well as the key challenges that need to be overcome for their deployment in real-world systems to achieve cost-effective and sustainable materials recovery.

关键词： Materials recovery electrosorption Capacitive deionization Redox processes Electrochemical precipitation

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Structure of Oxygen and CO Adsorption on Ru(0001) Electrode

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Chinese Chemical Letters 2003年第2期14卷 201-204页

作者： Wei Bo WANG Mau Scheng ZEI 等 CenterforMolecularScience InstituteofChemistryChineseAcademyofSciencesBeijing100080 Fritz-Haber-InstitutederMax-Planck-Gesellschaft Faradayweg4-6D-14195Berlin

electrosorption of oxygen and CO on Ru(0001) surface were investigated by ex-situ electron diffraction (LEED/RHEED), AES and electrochemical data. The Ru(0001) surface exhibited a strongly affinity for oxygen which gave preference to form a (22)-O phase. However, anodization of Ru(0001) electrode produced a (11)-O phase. A coadsorption structure (2CO+O)(22) / Ru(0001) was performed from electrosorption of CO on Ru(0001) surface in electrolyte solution.

关键词： Ru(0001) electrosorption oxygen carbon monoxide.

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