RSC Advances
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2016
·Vol. 6
·期 79
·75855-75861
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IF 3.289
Qixuan Song,Hui Wang,Baoshan Yang,Fei Wang,Xinrong Sun
A novel silver nanoparticle-modified magnetic multi-walled carbon nanotube composite (Ag-FMWCNTs) was synthesized by embedding Fe3O4 and assembling Ag nanoparticles in one-step. The properties of the Ag-FMWCNTs composites and magnetic multi-walled carbon nanotubes (FMWCNTs) were studied by scanning electron microscopy, vibrating sample magnetometry (VSM) and Fourier transform infrared spectroscopy. The adsorption isotherms, adsorption kinetics and the effects of solution pH and ionic strength to adsorb emerging contaminant sulfamethoxazole (SMX) from aqueous solution on different multi-walled carbon nanotubes-based adsorbents were determined. The results showed that the adsorption kinetics could be explained well by means of the pseudo-second-order and intraparticle diffusion models. The pH experiments showed that maximum adsorption occurred at pH 4. Additionally, all adsorbents had a strong adsorption ability to SMX and the Langmuir maximum capacity followed the order: 5% Ag-FMWCNTs (118.58 mg g−1) > 3% Ag-FMWCNTs (86.41 mg g−1) > MWCNTs (73.69 mg g−1) > 1% Ag-FMWCNTs (70.26 mg g−1) > FMWCNTs (45.13 mg g−1). The spent adsorbents were regenerated in methanol. It was also found that after regenerating four times, multi-walled carbon composites retained up to 80% of their original adsorption performance. Therefore, the Ag-FMWCNTs composite could be used as a potential adsorbent for removing sulfamethoxazole from water.
研究领域:
环境科学
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纳米技术
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水污染控制
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吸附材料
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药物残留治理
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FOOD AND AGRICULTURAL IMMUNOLOGY
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2019
·
IF 2.398
Zexiang Wang,Song Hu,Ganggang Zhang,Jintao Liu,Jun Xia,Juan Peng,Weihua Lai
Sulfamethazine (SMZ), widely used for disease prevention of bees, is harmful to consumers when excess SMZ residues are present in honey. In this study, a novel competitive lateral flow immunoassay (LFIA) was established by using aggregation-induced emission fluorescent microsphere (AIEFM) as label for the detection of SMZ. Results indicated that the limit of detection (LOD) for the developed competitive AIEFM-LFIA in honey was 0.028 ng/mL, and the corresponding linear range was 0.05−5 ng/mL. Recovery experiments showed that the average recovery range was 75.6–95.1% with coefficient variations of 5.7–12.9% in honey. The developed competitive AIEFM-LFIA was compatible with HPLC-MS/MS in detecting SMZ in 15 real samples from honey. In general, the proposed AIEFM-LFIA is well suited for the competitive format and has great potential for the detection of other small targets with single antigenic site in practical application.
研究领域:
食品安全
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分析化学
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免疫学
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Nature Protocols
·
2026
·
IF 18.4
Guo Xuecheng,Gao Yuan,Zhang Chao,Zhang Shuai,Sang Shuaikang,Ma Jun,Murzin Dmitry Yu.,Low Jingxiang,Shao Tao,Xiong Yujie
Decentralized, sustainable ammonia production could have an immense global impact. Here we describe an electrolytic approach to synthesizing ammonia directly from air and water under ambient conditions, which could be developed and optimized toward this goal. The system integrates a gliding arc discharge plasma reactor for generating \({\rm{NO}}_{\rm{x}}\) from air with a membrane electrode assembly reactor for the electrochemical reduction of \({\rm{NO}}_{\rm{x}}^{-}\) to ammonia, enhancing both the efficiency and scalability of the process. Furthermore, the plasma-generated \({\rm{NO}}_{\rm{x}}\) feedstock can be substituted with \({\rm{NO}}_{\rm{x}}\) derived from industrial waste, further extending the potential of this system. In this Protocol, we describe the fundamental principles of this plasma-electrochemical nitrogen reduction reaction (PE-N 2 RR) system and provide advice for experimental standardization, operational mechanisms and data analysis methods. The procedure starts with the synthesis of the catalyst—a La 1.5 Sr 0.5 Ni 0.5 Fe 0.5 O 4 perovskite oxide—at either laboratory or industrial scale. This catalyst is sufficiently stable to enable the \({\rm{NO}}_{\rm{x}}^{-}\) RR to continuously work under strongly acidic conditions. We highlight the key operating parameters that are necessary for plasma-based \({\rm{NO}}_{\rm{x}}\) production and electrochemical \({\rm{NO}}_{\rm{x}}^{-}\) reduction reaction systems. This information and framework can be used to optimize and streamline the entire PE-N 2 RR system. A moderate level of expertise in electrochemistry, plasma systems and catalyst synthesis is recommended to ensure successful execution. The setup of the entire PE-N 2 RR system, from catalyst synthesis to the configuration of plasma and electrochemical, is estimated to take 72 h. The full reaction operation test requires 200 h, whereas in situ electrochemical characterizations take 3 h.
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Journal of Energy Chemistry
·
2026
·
IF 15.6
Hewei Zhang,Zifan Zhu,Wei Wu,Jiajian Lin,Jiabei Song,Yutong Niu,Jinyu Ye,Abdullah N. Alodhayb,Yixi Zhuang,Zhou Chen,Wei Cheng
High-entropy nanomaterials have attracted tremendous research attention owing to their unique physical and chemical properties. Conventional methods for the synthesis of high-entropy nanomaterials often necessitate high temperatures and struggle with achieving well-defined morphologies. Here, we report room-temperature synthesis of high-entropy metal sulfide nanobelts through sequential cation exchange reactions between the pre-synthesized cobalt sulfide nanobelts and various metal ions in aqueous solution. The cation exchange reaction follows the hard and soft acid-base theory, which guides us to design and produce a variety of binary to high-entropy octonary metal sulfide nanobelts with uniform distribution of elements. The high-entropy quinary (CoCuSnFeIn)S x nanobelts demonstrate significantly enhanced electrocatalytic performance for the nitrate reduction reaction in comparison to low- and medium-entropy metal sulfide nanobelts, due to the increased configurational entropy and synergistic benefits of the incorporated metal elements. Our work provides a facile yet powerful synthesis platform for designing and synthesizing a diverse array of multi-metal/high-entropy sulfide nanomaterials with controlled compositions for electrocatalytic applications. A room-temperature sequential cation exchange strategy is developed to synthesize high-entropy metal sulfide nanobelts. These nanobelts exhibit exceptional electrocatalytic activity and selectivity for the nitrate reduction reaction to ammonia. Download: Download high-res image (234KB) Download: Download full-size image
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Shijian Zhang,Xiuxiu Huang,Wenbin Ruan,Xiaotong Mu,Kai Chen,Ge Ge,Hao Zhang,Jie Li,Yaner Ruan,Xiufang Wang
A self-supporting hierarchical NiFe-LDH@Cu/Cu 2 O heterostructure has been designed. • The tightly coupled NiFe-LDH@Cu/Cu 2 O heterointerface achieves efficient proton-electron synergistic transfer. • The catalyst delivers NO 3 − reduction performance with high Faradaic efficiency and excellent selectivity toward NH 3 . Electrochemical nitrate reduction reaction (NO 3 RR) provides a sustainable approach for ammonia synthesis and environmental remediation; however, the multi-step proton-coupled electron transfer processe poses significant challenges for achieving high efficiency and selectivity. Herein, we engineered a self-supporting NiFe-LDH@Cu/Cu 2 O (LDH: layered double hydroxides) heterostructure via facile hydrothermal and electrochemical deposition methods. The optimized electrode delivers exceptional NH 3 synthesis performance (1.06 ± 0.058 mmol h −1 cm −2 and a Faraday efficiency of 97.6 ± 1.88% at −0.4 V vs. RHE) and an excellent long-term stability. The experimental and theoretical calculation results reveal that NiFe-LDH accelerates water dissociation to yield abundant active hydrogen (*H) species, relieving the *H shortage during the reaction. The Schottky interface of Cu/Cu 2 O further optimizes interfacial electronic configuration, facilitates electron transport, and strengthens the adsorption of NO 3 − and reaction intermediates. The tightly coupled NiFe-LDH@Cu/Cu 2 O heterointerface realizes a highly efficient proton-electron synergistic relay. This distinctive effect drives the coordinated transport of electrons and protons, maximizes the utilization of active hydrogen, and expedites the deep hydrogenation of NO 2 − intermediates. This work provides a rational design strategy for enhancing NO 3 RR performance toward waste nitrate treatment and green ammonia synthesis via proton-electron coupled transfer engineering. Download: Download high-res image (250KB) Download: Download full-size image
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Nature Protocols
·
2026
·
IF 18.4
Jia Shunhan,Wang Ruhan,Liu Hanle,Wu Limin,Zhang Libing,Li Qian,Zhang Xiaoyu,Xiang Junfeng,Zhao Zhijuan,Sun Xiaofu,Han Buxing
Electrocatalytic upgrading of aqueous nitrate ( \({\rm{NO}}_{3}^{-}\) ) and nitrite ( \({\rm{NO}}_{2}^{-}\) ) represents a sustainable and increasingly important approach for producing valuable nitrogenous chemicals from abundant and hazardous feedstocks. Recent advances have demonstrated the ability to selectively convert \({\rm{NO}}_{3}^{-}\) / \({\rm{NO}}_{2}^{-}\) into products such as inorganic nitrogenous species including ammonia (NH 3 ), hydroxylamine (NH 2 OH), hydrazine (N 2 H 4 ) and organonitrogen compounds (e.g., urea, oximes and amines). However, the absence of standardized protocols has hindered reproducibility and cross-laboratory comparisons. Herein, we present a comprehensive protocol for aqueous \({\rm{NO}}_{3}^{-}/{\rm{NO}}_{2}^{-}\) -involved electrocatalytic reactions. Our protocol includes electrode preparation, electrolyzer assembly, electrolysis, product quantification and purification, in situ characterization and technoeconomic analysis. The protocol includes essential safety guidelines for toxic intermediate handling. Moreover, it remains adaptable to different levels of experimental capability. This protocol is suitable for initial screenings and mechanistic investigations spanning small-scale reactors (<30 ml) to liter-level systems and takes ~2 weeks to complete. This work is designed for researchers in green and sustainable chemistry, electrocatalysis, nanotechnology and environmental science and aims to establish reproducible workflows that accelerate the development of electrochemical \({\rm{NO}}_{3}^{-}/{\rm{NO}}_{2}^{-}\) upgrading strategies. More importantly, we hope that the protocol can motivate researchers to design catalytic strategies to upgrade renewable chemical sources beyond \({\rm{NO}}_{3}^{-}/{\rm{NO}}_{2}^{-}\) .
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Nature Water
·
2026
·
IF 30.7
Liu Fu,Hao Fengkun,Sun Mingzi,Wang Helin,Yao Ning,Wang Yunhao,Wang Juan,Chen Peng,Ma Xintao,Zhou Jingwen,Xiong Yuecheng,Ma Yangbo,Wang Guozhi,Guo Liang,Meng Xiang,Shao Mingzheng,Wang Chaohui,Wang Miao,Qian Fangren,Ye Chenliang,Xi Shibo,Huang Bolong,Fan Zhanxi
Phase control of alloy nanomaterials can modulate their atomic/electronic structures towards various electrocatalytic applications. However, the controlled synthesis of high-entropy nanoalloys (HENAs) with unconventional phase remains challenging. Here we report the one-pot synthesis of RhCuNiInSb HENAs with the unconventional 2H phase through regulating the nucleation/growth kinetics. Compared with the face-centred cubic phase counterpart, 2H RhCuNiInSb HENAs exhibit superior electrocatalytic nitrate reduction performance at low nitrate concentration. Ex/in situ studies reveal the accelerated deoxygenation/hydrogenation kinetics and distinct reaction pathway. Theoretical calculations demonstrate the electronic optimizations induced by the face-centred-cubic-to-2H phase transition, where the electronic redistribution and p – d elemental interactions improve the surface electroactivity. When operated in flow cell, 0.5 l of simulated wastewater can be efficiently converted into the value-added ammonia-derived product within 10 h. With a 20-h electrolysis, the NO 3 − -N concentration in real industrial and agricultural wastewater can be both reduced above the World Health Organization standard for drinking water.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
·
IF 9.6
Weiguang Miao,Kai Zhu,Xiangfen Yan,Fangfang Chang,Qing Zhang,Ge Li,Zhengyu Bai
Copper-based catalysts have emerged as promising candidates for the electrochemical nitrate reduction reaction (NO 3 RR) to produce ammonia (NH 3 ). Achieving selective NH 3 synthesis with high Faradaic efficiency and productivity remains a significant challenge. Herein, we investigate the manipulation of dynamic Cu 0 /Cu + /Cu 2+ multiphase heterointerfaces using an electrochemical reconstruction strategy on a carbon-coated CuO/Cu 2 O@C catalyst during NO 3 RR. An intriguing catalytic relationship is revealed by electrochemical analysis that the formation of the dynamic Cu 0 /Cu + /Cu 2+ interface as superior active sites enhances the selective conversion of NO 3 − to NH 3 . The maximum NH 3 Faradaic efficiency (95.5%) and productivity (13.5 mg·h −1 ·mg cat −1 ) are achieved on multiphase heterointerfaces under pH-neutral conditions. As revealed by in situ structural analysis and density functional theory (DFT) calculations, multiphase heterointerfaces facilitate water activation, boost hydrogen supply, and lower the energy barrier for the rate-determining step of *NO-to-*N, thereby promoting the selectivity and Faradaic efficiency of NH 3 . This discovery paves the way for novel design of Copper-based catalysts, featuring improved activity and selectivity to promote NO 3 RR.
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MOLECULES
·
2022
·Vol. 27
·期 22
·8037
·
IF 4.927
Xiaoyu Guan,Juntao Guo,Hui Zhang,Shiyong Tao,Gilles Mailhot,Feng Wu,Jing Xu
The adsorption of antibiotics on minerals is an important process in their environment behavior. The adsorption behavior of antibiotics on iron-containing minerals and the effect of co-existing cations and anions were studied in this work. Magnetite, hematite, goethite and kaolin were selected as the representative minerals and characterized by SEM, XRD and BET. A total of eight antibiotics, including three quinolones, three sulfonamides and two mycins were chosen as the research targets. Results showed a higher adsorption amount of quinolones than that of sulfonamides and mycins on the surface of iron-containing minerals in most mineral systems. The adsorption isotherms of quinolones can be well fitted using the Freundlich models. The effects of five cations and five anions on the adsorption of quinolones were investigated, among which Mg2+, Ca2+, HCO3−and H2PO4−mainly showed significant inhibition on the adsorption, while the effects of K+, Na+, NH4+, Cl−, NO3−and SO42−showed less. Natural surface water samples were also collected and used as media to investigate the adsorption behavior of quinolones on iron-containing minerals. The buffering capacity of the natural water kept the reaction solution at circumneutral conditions, and the adsorption amount was mostly promoted in the goethite system (from 0.56~0.78 μmol/g to 0.52~1.43 μmol/g), but was inhibited in the other systems (magnetite: from 1.13~1.33 μmol/g to 0.45~0.76 μmol/g; hematite: from 0.52~0.65 μmol/g to 0.02~0.18 μmol/g; kaolin: from 1.98~1.99 μmol/g to 0.90~1.40 μmol/g). The results in this work help to further understand the transportation and fate of antibiotics in an aqueous environment.Keywords:antibiotics;iron-containing minerals;adsorption;co-existing ions;natural surface water
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Weixiang Tao,Peifang Wang,Bin Hu,Xun Wang,Gang Zhou
The electrocatalytic nitrate reduction reaction (NITRR) plays a critical role in maintaining global nitrogen balance, which is strongly depended on the reactive activity of catalysts. Herein, we develop a simple hydrothermal technology to replace the O ions in NiCo 2 O 4 (NCO) by S ions to form NiCo 2 S 4 (NCS), in which the bonding interactions among Ni-O or Co-O bonds are stronger than Ni-S and Co-S bonds. Therefore, more 3d electrons can be localized at Ni or Co sites that can donate more charges to the intermediates. As a result, the ammonia yield can be enhanced to 642 μg h −1 cm −2 and the selectivity can reach 92.42%, which is obviously excellent than NCO. This work provides a new insight into accelerating the electrocatalytic activity by regulating the orbital interaction between anions and cations.
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Catalysts
·
2022
·Vol. 12
·期 11
·1357
·
IF 4.501
Sijin Zuo,Yinqiao Zhang,Ruixin Guo,Jianqiu Chen
Spent caustic wastewater produced in a soda plant has a high concentration of ammonia nitrogen (NH4+-N). As excessive NH4+-N discharging into water bodies would cause eutrophication as well as destruction to the ecology balance, developing an efficient technology for NH4+-N removal from the spent caustic wastewater is imperative in the current society. In this study, an electrochemical process with graphene electrodes was designed for the NH4+-N removal in the spent caustic wastewater. The removal efficiency of the NH4+-N during the electrochemical process could reach 98.7% at 4 A in a short treatment time (within 120 s) with an acceptable energy consumption (6.1 kWh/m3-order). NO3−and NO2−were not detected during the electrochemical process. An insignificant amount of NH2Cl, NHCl2, and NCl3produced in the treatment suggested that little of the NH4+-N reacted with chlorine, that is, chlorination played a negligible role in the NH4+-N removal. By electron equilibrium and nitrogen conversion analysis, we think that NH4+-N was primarily converted to NH2(ads) on the surface of a graphene electrode by one-electron transfer during the direct oxidation of the electrochemical process. Due to the high calcium ion (Ca2+) in the spent caustic wastewater, the electrode scale significantly increased to 1.4 g after treatment of 240 s at 4 A. By X-ray diffraction (XRD) analysis, the composition of the electrode scale is portlandite Ca(OH)2. Although the electrode scale was obvious during the electrochemical treatment, it could be alleviated by alternating the electrode polarity. As a result, the life and efficiency of the graphene electrode for NH4+-N removal could remain stable for a long time. These results suggest that the electrochemical process with a graphene electrode may provide a competitive technology for NH4+-N removal in spent caustic wastewater treatment.Keywords:ammonia nitrogen;electrochemistry;spent caustic;graphene electrode;electrode scale
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
You Xu,Kaili Ren,Tianlun Ren,Mingzhen Wang,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
Electrochemical reduction of nitrate (NO 3 - ) to ammonia (NH 3 ) offers a sustainable avenue to close the NO 3 - cycle for NH 3 synthesis. Critical to the feasibility of electrochemical NO 3 - -to-NH 3 technology is the development of cost-effective, scalable and selective catalysts that can produce NH 3 with high yield. To this end, we design and constructure ultralow-content Pd (2.93 at%) in-situ incorporated Cu 2 O corner-etched octahedra (Pd-Cu 2 O CEO) with cavity and oxygen vacancy defects for selectively electrochemical NO 3 - -to-NH 3 transformation. The unique conner-etched cavity structure, rich surface oxygen vacancies, and Pd-Cu 2 O dual active sites, synergistically promote nitrate electroreduction undergo ammonia formation reaction pathway. Impressively, the as-made Pd-Cu 2 O CEO exhibited outstanding activity for electrocatalytic NO 3 - -to-NH 3 , with high ammonia selectivity (95.31%) and Faradaic efficiency (96.56%). The developed hierarchical-defect strategy may open a new avenue for reasonable design of defect electrocatalysts to contribute desirable properties and functionalities in specific applications.
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