ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
·
IF 0
Sun Qing,Yu Jiale,Zhao Youpu,Liu Hanhu,Li Chunsheng,Tao Jiajun,Zhang Jian,Sheng Jiawei
Iron-based catalysts are environmentally friendly, and iron minerals are abundant in the earth's crust, with great potential advantages for PMS-based advanced oxidation process applications. However, homogeneous Fe 2+ /PMS systems suffer from side reactions and are challenging to reuse. Therefore, developing catalysts with improved stability and activity is a long-term goal for practical Fe-based catalyst applications. In this study, we prepared Fe-HNTs nanoreactors by encapsulating a nitrogen-doped carbon layer with one-dimensional halloysite nanotubes (HNTs) using the molten salt-assisted method. Subsequently, Fe (Co, Ni) nanoclusters were anchored onto the nitrogen-doped carbon layer at a relatively low temperature (550℃), resulting in stable and uniform distribution of metal nanoclusters on the surface of HNTs carriers in the form of Fe-N x coordination. The results showed that the dissolution of the molten salt and leaching of post-treated metal oxides generated numerous mesopores within the Fe-HNTs nanoreactor, leading to a specific surface area more than 10 times that of HNTs. This enhanced mass transfer capability facilitates rapid pollutant removal while exposing more active sites. Remarkably, Fe-HNTs adsorbed up to 97% of tetracycline within 60 min. In the Fe-HNTs/PMS system, the predominant reactive oxygen species has been shown to be 1 O 2 , and the added tetracycline was degraded by more than 98% within 5 min. The removal of tetracycline was maintained above 96% in the presence of interfering factors such as wide pH (3–11) and inorganic anions (5 mM Cl − , HCO 3 − , NO 3 − , and SO 4 2− ). The investigated mechanism suggests that efficient degradation and interference resistance of the Fe-HNTs/PMS system is attributed to the synergistic effect between the rapid adsorption of porous structure and the non-radical ( 1 O 2 )-dominated degradation pathway. Graphical Abstract
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ADVANCED POWDER TECHNOLOGY
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2025
·
IF 4.2
Yan Zhao,Xing Zhou,Hongfeng Ji,Bian Li,Wei Zhou,Yao-Hua Liu,Guixi Liu
This study focuses on the thermal decomposition regulation behavior of AP achieved by Fe5B/AP nanoparticles, which are characterized using XRD, XPS and other techniques. When the mass ratio of Fe5B catalyst to AP was 3: 1, the high-temperature peak associated with AP decomposition advanced significantly by 181 ℃, resulting in a more concentrated exothermic process. Additionally, solid propellant containing an optimal mass ratio of 1: 3 for Fe5B to AP exhibited higher burning velocity compared to Fe 2 O 3 under low pressure condition with a 10 % increase in burning rate. Within the pressure range from 3.0 MPa to 9.0 MPa, the combustion rate of solid propellant containing Fe5B/AP (1: 3) remained similar to that achieved with Fe 2 O 3 but displayed a lower pressure index. The mechanistic studies show Fe-based structural units and active metal centers served as intermediates for electron transfer,expediting electron transfer between ClO 4 - and NH 4 + in the LTD process. Fe5B/AP particles generate iron oxides in situ, facilitating the adsorption of oxygen species and promoting increased heat release during the HTD stage. These findings highlight the potential application of Fe5B/AP as combustion catalysts for solid propellants by enabling controlled decomposition behavior of ammonium perchlorate.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Haoyang Fu,Ruizhao Wang,Qianyu Xu,Minwang Laipan,Chenliu Tang,Weixian Zhang,Lan Ling
Typical antineoplastic agent doxorubicin (DOX) contamination is a major environmental concern and its efficient purification remains a daunting challenge so far. This work explored the potential of Fe/Pd-doped graphite carbon nitride (g-C 3 N 4 @Fe/Pd) for DOX removal from water, involving the removal performance, mechanism, and pathway. Structural characterization of g-C 3 N 4 @Fe/Pd showed that the metallic Pd clusters are decorated on the surface of uniformly distributed iron nanoparticles (~ 28 nm) on g-C 3 N 4 . The existence of g-C 3 N 4 effectively relieved the agglomeration and overgrowth of iron nanoparticles, the strong coupling effect among the Fe, Pd and N demonstrates the excellent DOX removal performance (k = 0.115 min −1 ) with versatility under different initial concentrations (30–150 mg/L) and material dosages (0.1–0.4 g/L). Three possible degradation pathways of DOX were proposed, where catalytic saccharide moiety elimination is the primary pathway. Importantly, intermediates exhibit lower toxicity and the final degradation product is efficiently adsorbed by g-C 3 N 4 @Fe/Pd.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
·
IF 6.9
Xueqian Wu,Zhen Li,Jiangyan Tao,Yufei Xie,Wei Liu,Songjian Zhao
The Fenton technology used for treating formaldehyde-containing wastewater (HCHO) has limitations in terms of pH, efficiency, and cost. To address these issues, a Fe x -HT Fenton-like catalyst was developed in this study. This catalyst combines active Fe with walnut shell biochar (HT) that contains surface defects, resulting in a highly effective solution for the rapid purification of formaldehyde wastewater in complex environments. The carbon defects on the HT surface play a crucial role in stabilizing the active Fe binding, while the appropriate loading of Fe further enhances the specific surface area of HT. Additionally, the porous structure of HT provides ample contact sites for formaldehyde. Furthermore, the Fe 3 -HT catalyst exhibits superparamagnetism, allowing for convenient recovery of the catalyst after use. Experimental results demonstrate that Fe 3 -HT achieves an impressive 90% degradation rate for systems containing HCHO concentrations ranging from 200 to 800 mg/L. The effects of feed ratio, pH, and formaldehyde concentration on the performance of Fe 3 -HT were thoroughly investigated. Moreover, a possible mechanism for the degradation of HCHO by the Fe 3 -HT Fenton-like catalyst was proposed. The environmentally friendly catalyst developed in this study boasts numerous advantages, including low cost, high treatment capacity for wastewater, and strong adaptability to complex wastewater environments.
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LANGMUIR
·
2025
·
IF 3.9
Huining Lan,Jingge Niu,Tianshu Luo,Louqun Wang,Xiaohong Hou
Biological antioxidants play a crucial role in numerous disease-related biological processes, which has led to significant interest in their identification. In this research, a colorimetric sensor array was created. It uses MIL-53 (Fe, Mn) nanozymes to simultaneously detect multiple antioxidants. The bimetallic nanozymes, MIL-53(Fe, Mn), were synthesized by using a solvent-thermal method. This framework demonstrated notable oxidase-like catalytic ability. In particular, it facilitates the conversion of colorless TMB to a blue compound under different pH conditions. When antioxidants were introduced into the reaction system, the sensor array exhibited cross-reactivity, resulting in distinct color signals. Linear discriminant analysis (LDA) was successfully utilized to precisely identify the different concentrations of cysteine (CYS), glutathione (GSH), dopamine (DA), and ascorbic acid (AA) and their combinations. This method enabled accurate determination of the amounts of these substances both individually and in mixtures, providing a reliable way to analyze their concentrations in an experimental context. Furthermore, the prepared sensor array combined with the smartphone successfully distinguished the target antioxidants in the serum. The proposed sensing method would be expected to have practical applications in diagnosis.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Shi-Wen Lv,Jialu Pan,Xiaoran Wang,Yifan Shao,Yanqing Cong,Lin Che
It is of great significance to establish an effective method for removing Cr(VI) from wastewater. Herein, Fe-doped g-C 3 N 4 (namely Fe-g–C 3 N 4 –2) was synthesized and then employed as photocatalyst to conduct the test of Cr(VI) reduction. Notably, the embedding of Fe ion in g-C 3 N 4 can offer the Fe 2+ /Fe 3+ redox couples, so reducing the interfacial resistance of charge transfer and suppressing the recombination of photogenerated electrons and holes. The impurity energy levels will form in g-C 3 N 4 after the introduction of Fe ion , thereby boosting the light absorption capacity of catalyst. Thus, Fe-g–C 3 N 4 –2 showed good performance in photocatalytic Cr(VI) reduction, and the reduction efficiency of Cr(VI) can reach 39.9% within 40 min. Different with many previous studies, current work unexpectedly found that the addition of p -benzoquinone (BQ) can promote the Cr(VI) reduction, and the reduction efficiency of Cr(VI) over Fe-g–C 3 N 4 –2 was as high as 93.2% in the presence of BQ (1.5 mM). Further analyses showed that BQ can be reduced to hydroquinone (HQ) by photogenerated electrons, and UV light can also directly induce BQ to generate HQ by using H 2 O as the hydrogen donor . The HQ with reducing ability can accelerate the Cr(VI) reduction. In short, current work shared some novel insights into photocatalytic Cr(VI) reduction in the presence of BQ. Future research should consider possible reactions between photogenerated electrons and BQ. For the UV-induced photocatalysis , the suitability of BQ as the scavenger of O 2 •‒ must be given carefully consideration.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2025
·
IF 14.3
Yanhui Cao,Junhao Zeng,Xuerong Zheng,Yuan Liu,Junda Lu,Jinfeng Zhang,Yang Wang,Yida Deng,Wenbin Hu
Oxygen reduction reaction (ORR) in neutral electrolyte is urgently needed in various areas, such as metal-air batteries. However, the N-coordinated transition-metal single-atom electrocatalysts confront sluggish catalytic kinetics due to the inappropriate electronic structure and the as-resulted unreasonable adsorption strength towards oxygen-containing intermediates. In this work, we develop a strategy to tune the Fe d-orbital spin state by introducing inert Si atom into the first coordination sphere of Fe-N 4 moieties. The experimental and theoretical results suggest that Si atom generates the coordination field distortion of Fe and induces the Fe d-orbital spin state transforming from low to medium spin state. The optimized spin-electron filled state (t 2g 4 e g 1 ) of Fe sites weakens the adsorption strength to intermediates and reduces the energy barrier of *OH desorption. Consequently, Fe-Si/NC catalyst exhibits superior ORR performance compared with that of Fe-NC and commercial Pt/C, showing a more positive half-wave potential of 0.751 V (vs. RHE) in 0.1 mol/L phosphate buffered saline. In addition, Fe-Si/NC-based neutral zinc-air batteries show a maximum power density of 108.9 mW cm −2 and long-term stability for more than 200 h. This work represents the possibility of constructing distorted coordination configurations of single-atom catalysts to modulate electronic structure and enhance ORR activity in neutral electrolyte.
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CORROSION SCIENCE
·
2024
·
IF 7.4
Fei Gao,En Su,Jiaming Hou,Jiale Wang,Yukun Zhou,Haotian Qin,Zhenhai Xie,Jinlong Mao,Huaiyu Li,Wenjie Tao,Yingqi Chen,Junyu Qian,Guojiang Wan
Long-term corrosion profile of molybdenum was studied in three different simulated body fluids up to 28 days, compared with magnesium, zinc, and iron from the perspective of biodegradable metals (bio-metals). Their corrosion rate, mode, products and surface characteristics were comprehensively fathomed. Strikingly, Mo showed progressively advantageous long-term corrosion behavior with the smallest corrosion rate, and most importantly, more uniform mode, as compared with the other three bio-metals. It also performed bilaterally under the simulated inflammatory and bovine serum protein added conditions, with different corrosion progressions. These findings provide an optimistic outlook in opting molybdenum as a new type of bio-metal.
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Catalysts
·
2024
·Vol. 14
·期 4
·279
·
IF 3.8
Yan Wang,Wuxin Liu,Rongzhe Wang,Qing Wang,Shaohua Luo,Pengqing Hou,Yahui Zhang,Shengxue Yan,Xin Liu,Jing Guo
Fe/N-doped carbon (Fe-NC) is an excellent base-metal catalyst for use in an electrocatalytic oxygen reduction reaction (ORR) with high activity. In this paper, graphite phase carbon nitride (g-C3N4) was first obtained from the pyrolyzing of melamine, and then different proportions of FeCl3were separately doped into g-C3N4to further prepare the Fe-NC catalyst. The Fe-NC catalyst was applied in an ORR reaction, and the results show that the Fe-NC catalyst doped with 0.5 mmol FeCl3possesses exceptional electrocatalytic performance, with an onset potential of 0.96 V and a half-wave potential of 0.81 V, which approaches that of a Pt/C catalyst. Meanwhile, the Fe-NC catalyst displays high stability and methanol resistance. The results supply a new way to prepare efficient ORR electrocatalysts.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xianghui Meng,Yuanjie Zhang,Zhiqiang Wang,Zihan Wang,Huiqing Zhao,Ting Wang,Zongge Li,Wenjun Kang,Haibo Li
A defect-rich carbon catalyst with highly dispersed Fe/Zn/Ce species (FeZnCe-NC-1000) is synthesized via a controllable high-temperature pyrolysis strategy. Electrochemical characterizations reveal that FeZnCe-NC-1000 exhibits enhanced oxygen reduction reaction activity in 0.1 M KOH, featuring favorable kinetics and a dominant 4-electron transfer pathway. It also shows excellent durability with minimal performance degradation after 5000 cycles and strong methanol tolerance. When integrated into zinc-air batteries, FeZnCe-NC-1000 outperforms commercial Pt/C, delivering superior open-circuit voltage, discharge rate performance, specific capacity, and maximum power density. These results demonstrate that FeZnCe-NC-1000 is a promising non-precious metal catalyst with great potential for practical applications in energy conversion and storage systems.
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Catalysts
·
2025
·Vol. 15
·期 9
·850
·
IF 4
Qiongqiong He,Xuewen Wu,Ping Ma,Zhaoyang Song,Xiaoqi Wu,Ruize Gao,Zhenyong Miao
Phenol is a refractory organic pollutant that is difficult to degrade in wastewater treatment, and efficiently and stably degrading phenol presents a significant challenge. In this study, iron-doped humic acid-based nitrogen–carbon materials were prepared to activate peroxymonosulfate (PMS) for the degradation of phenol. The Fe-N-C/PMS system achieved a phenol degradation rate of 99.71%, which follows a first-order kinetic model, with the reaction rate constant of 0.1419 min−1. The phenol degradation rate remained above 92% in inorganic anions (Cl−, SO42−, HCO3−) and humic acid and the system maintained a 100% phenol removal rate over a wide pH range (3–9). The iron in the catalyst predominantly exists in the forms of Fe0and Fe3C, and Fe0, Fe2+/Fe3+are the main active sites that promote PMS activation during the reaction. Additionally, Fe-N-C has a large specific surface area (1041.36 m2/g). Quenching experiments and electron spin resonance (ESR) spectroscopy detected the active free radicals in the Fe-N-C/PMS system: SO4•−, •OH, O2•−, and1O2. The mechanism for phenol degradation was discussed, involving radical pathways (SO4•−, •OH, O2•−) and the non-radical pathway (1O2), in the Fe-N-C/PMS system activated by Fe0, Fe2+/Fe3+, sp2hybridized carbon, C-O/C-N, C=O, and graphitic nitrogen active sites. This study provides new insights into the synthesis of efficient carbon-based catalysts for phenol degradation and water remediation.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Yun Guo,Hong-Yi Li,Shuo Shen,Jie Cheng,Jiang Diao,Bing Xie
Chromium sludge is a hazardous solid waste which cannot be effectively treated but only piled up and abandoned, causing serious environment pollution and resource wasting. This work proposes an effective novel process to separately recover all resources in chromium sludge via a sustainable way. The obtained acid solving liquid from chromium sludge is desiliconized by cationic flocculant (PCAM) to induce coprecipitation of polysilicate gel and PCAM , which mixture is calcinated to generate the product of white carbon black in purity of 94.35% with a recovery of 92.58%. After desiliconization, V in the solving liquid is selectively extracted by microemulsion (ME), which is recovered as V 2 O 5 in purity of 99.34% with a recovery of 95.53% by the subsequent procedure of stripping-precipitation-calcination. The Fe 3+ in raffinate is reduced to Fe 2+ cations by Na 2 SO 3 , and is then recovered by H 2 C 2 O 4 precipitation to generate the FeC 2 O 4 product in purity of 99.12% with a recovery of 98.25%. Cr 3+ cations in residual solution are recovered by alkaline precipitation and calcination to generate the Cr 2 O 3 product in purity of 98.25% with a recovery of 92.68%. This work provides fresh penetrations into the synchronous detoxification, resource recovery and value-added utilization of hazardous industrial solid wastes.
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