SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chi Zhang,Haotian Wu,Jiazhou He,Xiangtong Kong,Di He,Junjian Zheng,Jinxing Ma
The extraction of ammonia from waste sources, such as urine, presents significant potential for its utilization as fertilizers and chemical precursors. Conventional recovery techniques, such as air stripping and chemical precipitation, face limitations due to their high energy demands and substantial chemical usage. Although electrochemical alternatives offer improved selectivity for ammonia recovery, they remain constrained by slow ammonia mass transfer. In this work, we have designed an electrochemical system incorporating a parallel plate stack design with a membrane electrode assembly. This innovation leverages the benefits of electrochemical base production coupled with rapid ammonia separation and recovery from urine. The system achieved an ammonia removal rate of 19.4 g-N m −2 h −1 , with removal and recovery efficiencies recorded at 72.7 % and 93.5 %, respectively, while consuming 19.5 kWh per kg-N. The system’s performance and robustness were then evaluated using real urine. Over 96 h of continuous operation, at an ammonia removal rate of 14.5 g-N m −2 h −1 and an energy consumption of 33.1 kWh per kg-N, the removal and recovery efficiencies stabilized at 84.2 % and 78.4 %, respectively. The chemical scale that formed on the assembly was easily removed using a 0.1 M citric acid solution. Overall, the findings underscore the critical role of the nickel-based membrane cathode assembly in achieving chemical-free and efficient ammonia separation and recovery from urine, which may facilitate broader applications of membrane electrode assemblies in waste management and related fields.
研究领域:
环境科学
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化学工程
·
废物管理
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2012
·
IF 2.905
Xiaohua Zhu,Qifang Jiao,Chuyi Zhang,Xiaoxi Zuo,Xin Xiao,Yong Liang,Junmin Nan
The graphene and 5-[ o -(4-Bromine amyloxy) phenyl]-10,15,20-triphenylporphrin ( o -BrPETPP) composite (GR- o -BrPETPP) film is prepared on the glassy carbon electrode (GCE) with graphene oxide (GO) modifier through a consecutive cyclic voltammetry process, and then its electrocatalytic oxidation to indirubin is investigated. The as-prepared GR- o -BrPETPP film exhibits wrinkling paper-like structure and lower electron transfer resistance. In comparison with the o -BrPETPP/GCE and GCE, the GR- o -BrPETPP film electrode prepared for five cycles indicates an excellent electrocatalytic oxidation activity toward indirubin with about 2.2 and 13.3 times higher current response, respectively. In addition, in the 0.1 mol L −1 acetate buffer solution (pH = 4.6), the film electrode displays a linear relationship between the oxidation current and the indirubin concentration in the range from 5.0 × 10 −7 mol L −1 to 2.4 × 10 −5 mol L −1 , and presents a detection limit of 1.0 × 10 −7 mol L −1 ( S / N = 3) by differential pulse voltammetry (DPV) with 220 s accumulation. Especially, this film electrode also shows a comparative sensitivity with high-performance liquid chromatography (HPLC) for the determination of the indirubin extractive of herbal medicines, showing its practical prospect in the electrochemical determination of indirubin.
研究领域:
分析化学
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电化学
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产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 28
·17240-17248
·
IF 3.361
Jinying Hou,Yuping Fan,Xiaomin Ma,Xianshu Dong,Suling Yao
Fly ash, as waste from coal combustion, has been effectively modified to improve its adsorption to remove toxic metals, and modified fly ash could be used for electrode modification to improve the sensitivity of the electrode. In this paper, a modified fly ash doped carbon paste electrode for the detection of trace cadmium was first and successfully developed. Several parameters affecting the anodic stripping voltammetric response of Cd(II) were optimized, such as the composition of the paste, pH of the measurement solution, the concentration of Sb(III) (or Sb(III) and Bi(III)), deposition potential and deposition time. Compared with Sb/MFA-CPE, the square wave anodic stripping voltammetry (SWASV) response of Cd(II) at Sb/MMFA-CPE had a higher linear range and lower sensitivity. Relative to MFA, MMFA-CPE, due to the introduction of CTAB, provided a larger effective area for interacting with analytes, more binding sites and further facilitating electron transfer at the electrode, and amplified the electrochemical signal. Compared with Sb/MMFA-CPE, the SWASV response of Cd(II) at Sb–Bi/MMFA-CPE had a higher linear range and similar sensitivity, since mechanisms at bismuth and antimony film electrodes were different. Besides, the electrode reactions of Cd(II) at bismuth film electrodes involved adsorption phenomena while they were free of adsorption at antimony film electrodes.
研究领域:
环境科学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Lin Yan,Li Hui,Miao Xiaodong,Sun Yunayuan,Ren Hao,Yu Xifeng,Cui Wangyang,Wu Mingbo,Li Zhongtao
Direct electro-epoxidation of propylene (D-EOPO) with a membrane electrode assembly (MEA) system represents a sustainable approach for producing propylene oxide, which can reduce ohmic losses and simplify product separation. To address the challenges of selectivity and activity, we develop an Ag/V catalyst and integrate it into the “liquid-free” MEA reactor for continues D-EOPO. The V in the catalyst facilitates the formation of Ag-O active centers, thereby reducing the generation energy of *O radicals. Meanwhile, V doping also results in a downshift of the d -band center of the Ag sites. Consequently, the formation of the crucial intermediate (*OC 3 H 6 ) is significantly accelerated through the coupling *O with adsorbed propylene, thereby markedly improving propylene oxide (PO) production. The MEA reactor, integrated with the developed Ag/V catalyst, can maintain a stable production rate of PO at 227 μmol/h over a period of 78 hours. Thus, the “liquid-free” electro-epoxidation protocol developed here exhibits greater industrial applicability.
研究领域:
化学工程
·
催化科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jing Wang,Jia-Wei Fang,Zhi-Yong Ji,Zhi-Yuan Guo,Xin-Wei Li,Jie Liu,Ying-Ying Zhao,Zhong Liu,Feng-Feng Gao,Yuan Zhong,Jun-Sheng Yuan
Lithium extraction from the solution in low Li + concentration by an energy-saving and high-efficiency method is still a challenge. Herein, a novel hollow porous LiMn 2 O 4 (H-LMO) with highly active site was proposed to enhance the extraction performance of Li + . Based on the established hollow porous structure, the H-LMO film electrode (H-LMOE) exhibits excellent lithium electrosorption performance and stability. Under the current density of 0.5 C, the electrosorption capacity of Li + could reach 31.52 mg/g, the separation coefficient of Li + /Mg 2+ was 581.67, and the energy consumption was as low as 0.49 Wh/mol Li. This unique structural strengthening mechanism made H-LMOE maintain a good Li + extraction performance even in a solution of low Li + concentration. The Li + electrosorption capacity of H-LMOE was 2.13 times that of T-LMOE in a 60 mg/L Li + solution, while the specific energy consumption of the H-LMOE was 15.78% lower than that of the traditional-LiMn 2 O 4 film electrode (T-LMOE). Even in a 10 mg/L Li + solution, the electrosorption capacity of H-LMOE was 21.48 mg/g, which was 10.0% higher than that of T-LMOE. Moreover, after 50 recycling processes, the final electrosorption capacity of the H-LMOE was about 25.0% higher than that of the T-LMOE.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jiao Chen,Jiahui Hu,Kuichang Zuo,Xiao-yan Li,Liyuan Zhang
Selective adsorption is of high value in many important areas, but this is a well-known challenge. Here, a self-supporting carbon film electrode, used as anode for selective adsorption of NO 3 – , was fabricated successfully by using fungus hyphae as feedstock. The removal of NO 3 – by the carbon film electrode is 0.345 m mol/g anode , accounting for 85.2 % of the total removed anions. The selectivity of NO 3 – over Cl - and NO 3 – over SO 4 2- is 6.7 and 13.8, respectively. The preferential electrosorption is relevant to the narrow micropores structure and the nitrogen doping of the carbon film, based on the pore size analysis and density functional calculation. This work opens a hopeful window in providing an effective approach to fabricate electrosorption materials and also could inspire the future development of selective materials for electrosorption of target ions.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xun-rui Wang,Xiang Wang,Hong-en Nian,Tong Chen,Lin Zhang,Shuang Song,Jin-hong Li,Yu Wang
Membrane capacitive deionization (MCDI) has emerged as a promising electric-field-driven technology for brackish water desalination and specific salt or charged ion separation. The use of carbon-based or pseudocapacitive materials alone for MCDI usually suffers from the drawbacks of low desalination capacity and poor cycling stability due to their limited accessible adsorption sites and obstructed charge-carrier diffusion pathways. Therefore, developing a hybrid electrode material with multiple charge storage mechanisms and continuous electron/ion transport pathways that can synergistically improve its specific capacitance and cycling durability has currently become one of the most critical technical demands. Herein, we developed a novel hierarchically architectured hybrid electrode by first spinning MXene into polyacrylonitrile (PAN)-based carbon nanofibers (MCNFs) to obtain a highly conductive carbon nanocomposite framework. The excellent spatial support structure can effectively prevent the dense packing of Cl–- and DBS–-doped polypyrrole (PPy) molecular chains during the following electrodeposition process, which not only ensures the efficient transport of electrons in the continuous hybrid carbon nanofibrous skeleton but also provides abundant accessible sites for ion adsorption and insertion. The obtained self-supporting membrane electrodes (MCNF@PPy+Cl– and MCNF@PPy+DBS–) have the advantages of outstanding specific capacitance (318.4 and 153.9 F/g, respectively), low charge transfer resistance (10.0 and 5.3 Ω, respectively), and excellent cycling performance (78% and 90% capacitance retention ratios, respectively, after 250 electrochemical cycles). Furthermore, the asymmetrical membrane electrodes showed a superior desalination capacity of 91.2 mg g–1 in 500 mg/L NaCl aqueous solution and obvious divalent ion (Ca2+, Mg2+) selective adsorption properties in high-salt water from the cooling towers of thermal power plants.
研究领域:
材料科学
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环境工程
·
电化学
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2013
·
IF 5.437
Kai Yan,Rui Wang,Jingdong Zhang
A novel photoelectrochemical (PEC) biosensing platform was constructed by assembling CdSe quantum dots (QDs) and DNA on liquid phase deposited TiO 2 (DNA–CdSe/TiO 2 ) film electrode. The transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis indicated that CdSe QDs were homogeneously assembled on TiO 2 film. The UV–visible diffuse reflectance spectra (DRS) showed that CdSe and DNA could effectively enhance the absorption of TiO 2 film to visible light. The obtained electrode showed a sensitive PEC response to o -aminophenol (OAP) under visible light irradiation . Due to the interaction between DNA and OAP, the response of OAP was improved by DNA immobilized on the sensing film. Under optimized conditions, the photocurrent was linearly proportional to OAP in the concentration range from 4.0×10 −7 to 2.7×10 −5 mol L −1 , with a detection limit (3 S/N) of 8.0×10 −8 mol L −1 . The novel strategy could provide a fast and sensitive method for OAP determination.
研究领域:
生物传感技术
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材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2016
·
IF 2.653
Xiaojun Zou,Fang Shang,Sui Wang
In this paper, a novel electrochemiluminescence (ECL) sensor of sol-gel@graphene luminescent composite film modified electrode for hyperin determination was prepared using graphene (G) as solid-phase microextraction (SPME) material, based on selective preconcentration of target onto an electrode and followed by luminol ECL detection. Hyperin was firstly extracted from aqueous solution through the modified GCE. Hydrogel, electrogenerated chemiluminescence reagents, pH of working solution, extraction time and temperature and scan rate were discussed. Under the optimum conditions, the change of ECL intensity was in proportion to the concentration of hyperin in the range of 0.02–0.24 μg/mL with a detection limit of 0.01 μg/mL. This method showed good performance in stability, reproducibility and precision for the determination of hyperin.
研究领域:
分析化学
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药物分析
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2015
·
IF 3.391
Xuemin Chen,Yanhui Ma,Danchao Chen,Ming Ma,Chunya Li
1-[3-(tert-Butoxycarbonylamino)propyl]-3-[3-(N-pyrrole)propyl]imidazolium tetrafluoroborate [( t -Boc-APPPI)BF 4 ], which is a novel pyrrolyl-functionalized ionic liquid, was synthesized and characterized. Subsequently, it was electrochemically deposited onto a glassy carbon electrode surface to fabricate a polymerized ionic liquid film electrode. X-ray photoelectron spectroscopy, scanning electron microscope and electrochemical impedance spectroscopy were used to confirm the successful polymerization of ionic liquid. Voltammetric behaviors of hexestrol at the film electrode were investigated. The oxidation peak slightly shifted towards positive potential, however, dramatically increased in peak current. Experimental conditions for hexestrol determination were optimized. The oxidation peak current is linear with hexestrol concentration in the range of 1.0 × 10 −8 –1.0 × 10 −5 mol L −1 . The detection limit is estimated to be 2.1 × 10 −9 mol L −1 (S/N = 3). Hexestrol in chicken meat was determined using the film electrode with good accuracy.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hongyuan Chuai,Haibei Yang,Sheng Zhang
Ni single-atom-decorated nitrogen-doped carbon materials (Ni–Nx-C) have demonstrated high efficiency in the electrochemical reduction of CO2 (CO2RR) to CO. In this study, Ni–Nx-C active sites were embedded within a carbon membrane via an electrospinning and pyrolysis process. The resulting self-supported carbon membrane hosting Ni–Nx-C sites could be directly utilized as an electrode for the CO2RR. To enhance the CO2RR performance of the carbon membrane, the porous structure of the carbon membrane was fine-tuned by incorporating a pore-forming agent. The optimized porous carbon membrane electrode, K0.66-Ni-NC, achieved an impressive CO faradaic efficiency (FECO) of over 90% within a wide potential range from −0.8 to −1.6 V vs RHE for CO2RR. Additionally, it maintained an FECO of above 90% at −0.8 V vs RHE throughout a 30 h durability test in an H-cell. Further analysis has revealed that the porous structure of the carbon membrane not only facilitates the mass transport of CO2 but also increases the level of exposure of active sites during the CO2RR.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2013
·Vol. 25
·期 6
·1446-1452
·
IF 2.817
Chen Chen,Xiangheng Niu,Yan Chai,Hongli Zhao,Minbo Lan,Yonggang Zhu,Gang Wei
This work presents a disposable bismuth-antimony film electrode fabricated on screen-printed electrode (SPE) substrates for lead(II) determination. This bismuth-antimony film screen-printed electrode (Bi-SbSPE) is simply prepared by simultaneously in situ depositing bismuth(III) and antimony(III) with analytes on the homemade SPE. The Bi-SbSPE can provide an enhanced electrochemical stripping signal for lead(II) compared to bismuth film screen-printed electrodes (BiSPE), antimony film screen-printed electrodes (SbSPE) and bismuth-antimony film glassy carbon electrodes (Bi-SbGC). Under optimized conditions, the Bi-SbSPE exhibits attractive linear responses towards lead(II) with a detection limit of 0.07 µg/L. The Bi-SbSPE has been demonstrated successfully to detect lead in river water sample.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）