RSC Advances
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2025
·Vol. 15
·期 25
·19826-19835
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IF 4.6
Suxing Luo,Jiang Li,Meizhi Yang,Ping Zeng,Yuanhui Wu
Enhancing supercapacitor performance by incorporating heteroatoms into biochar represents a fascinating strategy. Our study presented an uncomplicated process for creating porous biochar simultaneously doped with nitrogen (N), phosphorus (P), and iron (Fe). The source material was excess sludge from sauce-flavor liquor production, which conveniently provided high initial N and Fe content for the resulting biochar. The phosphorus originated from phytic acid, while gentle activation was achieved using potassium carbonate (K2CO3). We found that adjusting the K2CO3 proportion and activation heating allowed precise control over the final material's characteristics, including its pore network, surface chemistry, plus the ultimate N, P, and Fe levels. Through electrochemical assessment, the N, P, Fe/BC-700-2 sample demonstrated superior performance, exhibiting a specific capacitance up to 141.7 F g−1 when tested at a 1 A g−1 current density in 6 M KOH electrolyte. This efficacy stemmed from several contributing elements: a large specific surface area (BET, 824.5 m2 g−1), abundant structural imperfections coupled with extensive mesoporosity, and advantageous synergistic effects arising from N, P, Fe co-incorporation. This investigation demonstrates that transforming sauce-flavor liquor excess sludge (SFLS) into heteroatom-enriched biochar not only offers significant promise for developing advanced supercapacitor electrode materials but also provides a sustainable pathway for valorizing problematic industrial waste.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yuying Chen,Caiwen Wu,Haiyang Xie,Zhaoyan Deng,Yiming Liu,Yanjuan Zhang,Zuqiang Huang,Huayu Hu,Tao Gan
Iron-based catalysts have garnered great attention as alternatives for Fenton-like catalysts in the degradation of organic compounds. However, there is a demand for the synthesis of highly efficient iron-based catalysts that can solve the problems of iron dissolution and poor stability. Herein, nitrogen-doped graphitic carbon-supported Fe-Co/Fe 3 C dual active sites catalyst (Fe-Co/Fe 3 C-NC) is successfully prepared by ball milling method combined with subsequent high-temperature self-reduction. 0.5 wt%-Fe-Co/Fe 3 C-NC shows high efficiency in the activation of peroxymonosulfate (PMS) for the ultrafast degradation of high concentration Rhodamine B (200 mg/L of RhB is completely degraded within 8 min and the degradation rate constant is as high as 0.5066 min −1 ), as well as high stability and good reproducibility, attributing to the synergistic mechanism between the dual active sites (Fe-Co and Fe 3 C) and the adsorption sites (Fe 3 C and pyrrolic-N). Chemical quenching experiments and electron paramagnetic resonance indicate that the prepared 0.5 wt%-Fe-Co/Fe 3 C-NC exhibits outstanding activation for PMS by generating reactive oxygen species (SO 4 •− , • OH, 1 O 2 ) and high-valent FeCo=O species. This work shows useful insights into the synthesis of iron-based dual active sites catalysts, providing exciting chances for the highly efficient degradation of high concentration organic wastewater.
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Journal of Water Process Engineering
·
2023
·
IF 7
Xiuping Chen,Ting Zhang,Guangfei Qu,Yuanchuan Ren,Zuoliang Wang,Jun Wang,Ping Lu,Minhua Cheng,Xiaomei Chu
The degradation of cyanide ions in cyanide containing wastewater is a major challenge in water treatment . This article uses a one-step hydrothermal method to prepare iron copper bimetallic oxide catalysts and applies them for the rapid degradation of cyanide (CN − ). The experimental results show that under the optimal conditions, the removal rate of CN − in the bimetallic catalyst/H 2 O 2 system is close to 100 % within 1 h, which is significantly better than the single metal oxide catalyst. Through characterization by SEM-EDS, XRD, XPS, and combined with catalytic performance experimental analysis, it was found that. There is a synergistic effect between Cu and Fe, which can effectively promote the cycling of metal ions and improve the generation efficiency of hydroxyl radicals (HO • ) to a certain extent, thereby improving the degradation performance of CN − . In addition, ion chromatography was used to analyze the oxidation products and a possible pathway for CN − degradation was proposed. This provides new insights and ideas for the development of high-performance bimetallic oxide catalysts for cyanide degradation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Quanli Hu,Bin Yue,Hongyang Shao,Fan Yang,Jinghui Wang,Yin Wang,Jinghai Liu
Lanthanum-based LaMO 3 (M = Fe, Co, Ni) perovskite nanofibers were effectively fabricated by electrospinning approach coupled with calcination process. The crystallinity, microstructures, morphologies, elemental compositions, and chemical bonding states of LaMO 3 perovskites were investigated in detail. The electrochemical properties of LaMO 3 perovskite nanofibers as supercapacitor electrodes and lithium-ion battery anodes were elucidated. The specific capacitances of LaFeO 3 , LaCoO 3 , and LaNiO 3 nanofibers were 183.6, 95.8 and 116.3 F g −1 at the current density of 1 A g −1 , respectively. The supercapacitive properties of LaMO 3 NFs had originated from the redox reactions of M 3+ /M 2+ . As lithium-ion battery anodes, LaMO 3 (M = Fe, Co, Ni) nanofibers exhibited the specific discharge capacities of 331, 646, and 92 mAh g −1 after 200 cycles, respectively. This research endowed the potential and competent candidates of the perovskite type lanthanum-based nanofibers for supercapacitor electrodes and lithium-ion battery anodes.
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ACS Omega
·
2021
·
IF 3.512
Chang Xu,Wenlu Yang,Jiaxin Zhao,Jingyuan Ma,Mingxing Wu
In the present study, three types of specific solid, core–shell, and hollow structured cobalt and iron co-doped MoS2 nanocubes (denoted as s-Co-Fe-MoSx, c-Co-Fe-MoSx, and h-Co-Fe-MoSx) are controllably synthesized for the first time by regulating the reactant mass ratios. The prepared Co-Fe-MoSx nanocubes can function as a counter electrode in dye-sensitized and perovskite solar cells (DSCs and PSCs) and a working electrode in a supercapacitor. In the DSC system, the c-Co-Fe-MoSx nanocubes exhibit the maximum catalytic activity to the Co3+/2+ redox couple regeneration, and the device achieves a power conversion efficiency (PCE) of 8.69%, significantly higher than the devices using s-Co-Fe-MoSx (6.61%) and h-Co-Fe-MoSx (7.63%) counter electrodes. Similarly, all of the prepared Co-Fe-MoSx nanocubes show decent activity in PSCs and the device using the c-Co-Fe-MoSx counter electrode achieves the highest PCE of 6.88%. It is worth noting that, as the supercapacitor working electrode, the h-Co-Fe-MoSx exhibits a specific capacitance of 85.4 F g–1, significantly higher than the parallel values achieved by the s-Co-Fe-MoSx and c-Co-Fe-MoSx electrodes under identical conditions.
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CHEMISTRY OF MATERIALS
·
2016
·
IF 9.407
Chunwei Dong,Dong Yao,Jianyou Feng,Tingting Huang,Xiyu Hu,Zhennan Wu,Yi Liu,Bai Yang,Hao Zhang
Hollow nanostructures have shown charming properties beyond their solid counterparts, but the synthesis of multinary chalcogenide semiconductors with hollow nanostructures remains challenging, because of their complex components. In this work, we demonstrate a facile one-pot method to synthesize Cu2GeS3 hollow nanoparticles (NPs) based on Kirkendall effect by using dissolved GeO2 as the Ge source. A theory model according to the diffusion kinetic and reaction kinetic is established to investigate the growth mechanism of Cu2GeS3 hollow NPs. By using Cu2GeS3 hollow NPs as the template, quaternary Cu2MGeS4 (M = Zn, Ni, Co, Fe and Mn) hollow NPs are further produced, which are more difficult to prepare, because of their excessive ion species. Furthermore, Cu2GeS3 hollow NP-based gas sensors are prepared, which exhibit outstanding sensitivity for the detection of ethanol gas, because of their large surface-to-volume ratio and small grain size.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Shenbao Qu,Wenpei Guo,HongDi Mou,Ruyi Wang,Man Wei,Xia Hu
Phthalates (PAEs) are frequently detected in the water environment and pose a severe threat to the ecosystem and human health. Electro-Fenton technology is regarded as an effective approach to degrade PAEs; however, the preparation of inexpensive and efficient cathode materials has restricted its further application. In this study, Fe/Co bimetallic sites were incorporated into solid waste wine lees to synthesize highly active heterogeneous catalyst, and dimethyl phthalate (DMP) was chosen as the target pollutant to investigate the activity of the catalyst. Both the degradation of DMP and the removal of total organic carbon (TOC), the performance of Fe/Co co-modified biochar (FeCo@NOPC) is superior to that of Fe (Co) alone (Fe@NOPC/Co@NOPC) and modified biochar (NOPC). Under neutral conditions. Within 5 h, the DMP removal rate reached 89 % and TOC was reduced by approximately 40 %. The mechanism study reveals that the degradation of DMP is mainly attributed to the OH generated by the cathode, and the anodic oxidation and cathode adsorption only play minor roles. Finally, the degradation path of DMP was analyzed by LC-MS technique. This study offers a novel way to utilize solid waste and reduce the cost of heterogeneous electro-Fenton system.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2025
·Vol. 27
·期 2
·1-15
·
IF 2.6
Hui Xianghe,Fang Dong,Wang Guifang,Ran Feng,Zhang Xin,Fu Zewei,Ruzimuradov Olim
Perovskite hydroxystannate (MSn(OH) 6 ) has garnered considerable interest in recent years as a novel flame retardant characterized by its low toxicity and environmentally benign properties. In order to improve the flame retardancy and smoke suppression properties of epoxy resin (EP) matrices, transition metal hydroxystannate (MSn(OH) 6 , M = Fe, Co, Mn) was prepared by a ultrasonic-coprecipitation method and used as flame retardants. The synthesized composites were assessed for their flame retardant characteristics and mechanical properties through the measurement of the limiting oxygen index (LOI), the cone calorimetry test (CCT), and universal tensile testing. Upon the incorporation of 10 wt% of the MSn(OH) 6 flame retardants, the flame retardant of EP composites exhibited marked enhancement, especially manganese hydroxystannate (MHS). Compared with pure EP, the EP/MHS-10 composite demonstrated the best performance, reducing the peak of heat release rate (pHRR), total heat release (THR), total smoke production (TSP) by 60.0%, 14.4%, and 32.6%, respectively. During the process of combustion, the decomposition of MSn(OH) 6 results in the generation of non-flammable gases and water vapor. In the condensed phase, tin (Sn) and transition metals contribute to the formation of a more protective char residue. The residue serves as a physical barrier, effectively isolating the underlying epoxy (EP) matrix material from heat and oxygen.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Wenjing Yang,Chenhang Ding,Yibing Ji,Chongxian He,Feilong Xiong,Wurikaixi Aiyiti,Cijun Shuai
The overexpression of glutathione (GSH) within the tumor microenvironment has long been considered as the major obstacle for reactive oxygen species (ROS)-based antitumor therapies. To address this challenge, a selenite (SeO 3 2 − ) and ferric ion co-doped hydroxyapatite (SF-HAP) nanohybrid was synthesized, which is then introduced into poly-L-lactic acid (PLLA) to prepare porous scaffold by selective laser sintering to continuously release Fe 3+ and SeO 3 2− ions. Of great significance is the released SeO 3 2− catabolize GSH to generate superoxide anion (O 2 •− ) rather than directly eliminating GSH, thereby reversing the obstacle posed by its overexpression and achieving a "waste-to-treasure" transformation. The newly generated O 2 •− synergizes with the hydroxyl radicals (•OH) produced by the Fenton reaction between Fe 3+/2+ and hydrogen peroxide, triggering high concentration ROS storms. Collectively, the PLLA/SF-HAP scaffold mediated self-augmented catabolism dynamic progress significantly raised intracellular ROS levels, almost twice as much as PLLA/Fe-HAP scaffold, thereby effectively inducing tumor cell apoptosis. The study provides an innovative inspiration for ROS-based antitumor therapies.
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Yuanqing Wang,Yusong Pan,Shuhuan He,Run Huang
This study reports an innovative europium-iron co-doped bismuth tungstate catalyst (EF-Bi 2 WO 6 ) for rapid organic pollutant degradation through a visible light-driven photo-Fenton process. The results of degradation experiment verified that the 1-EF-BWO catalyst exhibited superior photo-Fenton catalytic activity relative to single-doped and undoped Bi 2 WO 6 , achieving over 99 % degradation of Rhodamine B (RhB) within 6 min, with a kinetic rate constant of 0.9745 min −1 , which was 4.81 times higher than pure Bi 2 WO 6 (0.1678 min −1 ) and 2.42–2.92 times superior to Eu- or Fe-doped Bi 2 WO 6 . Remarkably, 1-EF-BWO maintained consistent degradation efficiency across a broad pH value and diverse ionic environments, showcasing robust operational adaptability. The enhanced catalytic activity is attributed to synergistic electron transfer mechanisms between Eu 3+ , Fe 3+ , and the Bi 2 WO 6 matrix, which optimized band gap structure to facilitate charge carrier separation. EPR spectroscopy revealed that singlet oxygen ( 1 O 2 ), photogenerated holes (h + ), and superoxide radicals (·O 2 − ) served as the primary reactive species driving pollutant mineralization. Reusability tests demonstrated remarkable catalytic stability over multiple cycles. Phytotoxicity assessments revealed that EF-Bi 2 WO 6 -treated wastewater significantly enhanced mung bean germination rates, underscoring its ecological compatibility for sustainable wastewater remediation. These results establish EF-Bi 2 WO 6 as a sustainable, pH-tolerant nanocatalyst with dual advantages of ultrafast degradation kinetics and environmental safety.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zizai Ma,Zihao Wan,Shuaili Zhao,Jinping Li,Jianping Du,Xiaoguang Wang
Bimetallic single-atom catalysts have garnered considerable interest in the field of the oxygen reduction reaction due to their unique electronic configurations and synergistic catalytic effects. However, precise modulation of d-orbital electron distribution at single-atom sites and comprehensive elucidation of the underlying catalytic mechanisms continue to present significant challenges. Herein, the FeCo(mlm)–N–C catalyst, integrating atomically dispersed Fe–Co dual-metal sites and Fe3C nanoparticles, was synthesized by using an encapsulation and ligand exchange strategy. Comprehensive analyses and theoretical simulations reveal that the incorporation of Fe3C nanoparticles induces significant d-orbital electron delocalization at the Fe active sites. This tailored electronic configuration effectively modulates Fe d–O p hybridization between the Fe active sites and adsorbed OH*. Consequently, it optimizes the occupancies of bonding and antibonding orbitals, thereby accelerating OH* desorption. This mechanism enables FeCo(mlm)–N–C to exhibit excellent catalytic performance and remarkable stability in both acidic and alkaline environments, while demonstrating superior activity in zinc-air batteries and proton exchange membrane fuel cells. This work not only presents a highly efficient non-noble metal electrocatalyst but also provides valuable insights into the rational development of advanced transition metal–nitrogen–carbon catalysts for energy-related applications.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Shuangjiang He,Junchang Wang,Chong Wang,Xiao Zhang,Sen Liang
The Mn-Fe-Co-Zn-O series is a widely used thermistor material, but its thermal stability is compromised by nitrogen glass encapsulation, limiting its application in electrical devices. To address this issue, La 2 O 3 and Y 2 O 3 were used as rare earth oxide dopants, and xR 2 O 3 -Mn 0.76 Fe 0.87 Co 1.07 Zn 0.3 O 4 (x = 0.0025, 0.005, 0.01, 0.02) negative temperature coefficient (NTC) materials were synthesized via solid-state sintering. The effect of rare earth doping on the electrical properties after high-temperature nitrogen annealing was investigated. After annealing at 750°C for 4 h, the variation in resistivity ( ρ 25 ) and material constant ( B 25/50 ) significantly decreases with increasing La doping. For the La-doped sample (x = 0.01), Δρ 25 decreased to 7.77% and ΔB 25/50 to 0.77% (for the Y-doped sample (x = 0.01), Δρ 25 decreased to 22.76% and ΔB 25/50 to 1.91%), compared to the undoped sample, where Δρ 25 reduced by 168.84% and ΔB 25/5 0 by 5.57%. This improvement was attributed to rare earth accumulation at grain boundaries, filling voids and forming R-O bonds, which inhibited oxygen vacancy migration and significantly reduced grain boundary resistance. Rare earth doping effectively improved the thermal stability and electrical consistency of NTC thermistor ceramics in high-temperature nitrogen atmospheres, offering a new strategy for high-temperature encapsulation applications. (Y-doped samples showed similar results, as detailed in the Supplementary Materials.)
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