Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Yu Deng,Jingfan Chen,Ailun She,Fuquan Ni,Wenqing Chen,Tianqi Ao,Ying Zhang
The novel Fe-loaded porous hydrothermal biochars (FeKHCs) were successfully prepared by two-step synthesis of hydrothermal pretreatment and pyrolysis at different temperatures and used to remove tetracycline (TC) from wastewater. The biochar synthesized at 900 °C (FeKHC900) showed the highest specific surface area (SSA) (1487.55 m 2 /g) and porosity volume (V total ) (0.9951 cm 3 /g), which was significantly affected by hydrothermal pretreatment and K 2 C 2 O 4 activation. K 2 C 2 O 4 favored the micropores formation, which was beneficial to TC adsorption. Thus, FeKHC900 had the largest sorption amount of 606.52 mg/g for TC and outstanding performance for the other three antibiotics. Moreover, Fixed-bed column adsorption experiments proved that FeKHC900 has good dynamic adsorption performance (425.93 mg/g). The slightly reduced sorption amounts in different initial pH, coexisting ions, and humic acid (HA) indicated that FeKHC900 has a high resistance to interference and selective adsorption ability. Batch experiments revealed that TC adsorption was dominated by chemisorption, and the main mechanism referred to π-π interactions, pore-filling, H-bonding, and complexation. This work shares a simple and effective strategy for fabricating magnetic porous hydrothermal biochar as an efficient adsorbent to treat antibiotics.
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SURFACE & COATINGS TECHNOLOGY
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2025
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IF 6.1
Miaomiao Tang,Xia Zhang,Bo Wang
Superhydrophobic solid-liquid composite (SLC) coatings are recognized as a promising material for addressing wear and ice accumulation issues due to their inherent self-lubricating properties. In this study, iron-doped carbon nanotube (CNT@Fe) coatings with photothermal, anti-friction, and wear-resistant properties were successfully fabricated via an aerosol-assisted chemical vapor deposition (AACVD) process. Subsequently, a spin-coating process was employed to apply perfluoropolyether (PFPE) onto the CNT surface, resulting in the formation of solid-liquid composite coatings. The CNT coating inherently proves to be highly stable, self-lubricating, and wear-resistant properties. Following the application of the solid-liquid composite, the film exhibited an average friction coefficient decrease to 0.10, marking a 33 % decrease compared to the 0.15 coefficient of CNT coatings. Additionally, the wear rate decreased by approximately 74 %. The main factors for reducing friction and preventing wear are the self-lubricating and bearing properties of CNT, along with the solid-liquid synergistic lubrication provided by solid-liquid composite coatings. Meanwhile, the superhydrophobicity of the coatings and the photothermal effect result in excellent anti-icing properties, which make it possible to de-ice in 300 s. The coatings exhibit prospective for outdoor anti-icing applications and mechanical component surfaces due to their photothermal and wear resistance characteristics.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Qianshun Chen,Qiuyan He,Yiting Wang,Chen Huang,Yuyu Lin,Jieyang Wang,Wei Shen,Bin Qiu,Xunyu Xu
Carcinoembryonic antigen (CEA) is the most widely adopted biomarker for the early determination of various cancers, thus it is very important to design a simple and highly effective sensing method to detect CEA. Herein, by synthesizing Fe-MOF nanohybrid loaded with platinum nanoparticles (Pt NPs/Fe-MOF) nanozyme and selecting CEA aptamer (Apt) as the specific recognition element, a simple nanozyme-based voltammetric sensor was designed to detect CEA based on Apt-controlled the catalytic activity of Pt NPs/Fe-MOF nanozyme. The as-synthesized Pt NPs/Fe-MOF nanozyme could catalyze effectively 1,2-diaminobenzene oxidation to produce electroactive 2,3-diaminophenazinc (DAP) which can exhibit a strong reduction current. Nonetheless, when Pt NPs/Fe-MOF is covered fully by Apt of CEA, the peroxidase activity of the as-synthesized Pt NPs/Fe-MOF nanozyme is remarkably restricted and the peak current of DAP would disappear nearly. Interestingly, this catalytic activity could be recovered effectively in the presence of CEA owing to the specific identification of Apt toward CEA. Through optimizing several experimental factors, the as-designed nanozyme voltammetric sensor offers superior detective performance for CEA. In addition, the as-designed sensor possesses superior specificity and selectivity, reproducibility and stability as well as practical applications, showing great potentials for achieving simple, sensitive and highly effective determination of CEA.
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FUEL
·
2024
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IF 6.7
Silu Liu,Yue Wang,Jinxiao Gao,Wei Jin,Weiping Xiao,Liantao Xin,Zhenyu Xiao,Guangrui Xu,Chunlong Dai,Huadong Zhang,Zexing Wu,Lei Wang
Nickel-iron based (Ni-Fe) catalysts are widely used in the electrolysis of water due to their high activity and low cost. However, the development of highly active non-precious metal catalysts is still a great challenge. Herein, self-supported nickel–iron phosphide is fabricated through a sulfurization/phosphorization approach (Ni-Fe-P-S-1/Ni-Fe-P-S-2). The prepared catalysts show excellent catalytic performance and stability. The HER performance of Ni-Fe-P-S-1 reaches 500 mA cm −2 with small overpotentials of 289 mV in alkaline freshwater. Meanwhile, the Ni-Fe-P-S-2 requires 312 and 375 mV to reach 500 mA cm −2 in alkaline freshwater and alkaline seawater for OER. Remarkably, at the current density of 500 mA cm −2 , the Ni-Fe-P-S-1||Ni-Fe-P-S-2 electrolyzer requires only 1.85 V in alkaline. Interestingly, sustainable energies can power the electrolyzer effectively. The work provides methods for potentially promising and cost-effective electrocatalysts.
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MICROCHIMICA ACTA
·
2024
·Vol. 192
·期 1
·1-12
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IF 5.3
Hou Linqian,Wei Jinya,Xiang Chen,Yang Dezhi,Yang Yaling
A novel copper and iron doped containing chitosan and heparin sodium carbon dots (CS-Cu,Fe/HS) nanozyme was formulated through a single-step microwave digestion method. CS-Cu,Fe/HS exhibits excellent peroxidase (POD)-like activity and positive charge characteristics, and it can oxidize the negatively charged 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) in the presence of H 2 O 2 to produce a green compound (ox-ABTS). Furthermore, CS-Cu,Fe/HS enhances electron transfer and provides additional active sites through the valence state transformations of Fe 2+ /Fe 3+ and Cu 2+ /Cu + . Interestingly, the POD-like activity of CS-Cu,Fe/HS is inhibited with the introduction of ampicillin (AMP), which may be because the Cu and Fe ions in CS-Cu,Fe/HS form complexes with AMP, leading to changes in the structure or surface properties of the nanozyme, thereby reducing the number of active sites on the nanozyme. Drawing from this, a straightforward and reliable colorimetric sensor was constructed for AMP detection, featuring a linear range of 0.033 to 110 μg/mL and a detection limit as low as 11.6 ng/mL. The proposed detection method for AMP performed well in real samples, with recoveries ranging from 94.8% to 110.2%. Graphical abstract
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JOURNAL OF POWER SOURCES
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2017
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IF 6.395
Bo Xu,He Yang,Lincheng Yuan,Yiqiang Sun,Zhiming Chen,Cuncheng Li
Development of low-cost, highly active bifunctional catalyst for efficient overall water splitting based on earth-abundant metals is still a great challenging task. In this work, we report a NiFe-Se/C composite nanorod as efficient non-precious-metal electrochemical catalyst derived from direct selenylation of a mixed Ni/Fe metal-organic framework. The as-obtained catalyst requires low overpotential to drive 10 mA cm −2 for HER (160 mV) and OER (240 mV) in 1.0 M KOH, respectively, and its catalytic activity is maintained for at least 20 h. Moreover, water electrolysis using this catalyst achieves high water splitting current density of 10 mA cm −2 at cell voltage of 1.68 V.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Yuchen Xing,Xiuli Shen,Qijian Niu,Hongwei Duan,Chengshun Tang,Bo Tao,Siyu Chen,Qianyi Shangguan,Bo Feng,Haizhang Yu,Zhong Tang,Guanya Ji
Nanoplastics, characterized by their small size, high diffusion, and stability, have emerged as the new class of pollutants posing a global threat. For achieving both chemical and thermal stability of adsorbents, this study synthesized FeMg-LDO@BC, a novel adsorbent prepared through the in-situ growth and calcination of FeMg-layered double hydroxide (FeMg-LDH) on pre-treated biochar. FeMg-LDO@BC demonstrated an excellent adsorption rates and removal efficiencies for polystyrene nanoplastics (PSNPs) as determined by pseudo-first-order kinetic model and Sips isotherm model, reaching a 99.8 % adsorption efficiency and the maximum capacity of 97.93 mg/g. The removal mechanism was primarily attributed to π-π EDA interactions, surface complexation, and hydrogen bonding. Furthermore, the composite exhibited excellent chemical and thermal stability, demonstrating robust environmental adaptability and regenerative performance. After five cycles of adsorption-thermal degradation, FeMg-LDO@BC maintained 80 % of its initial adsorption capacity. The thermal regeneration products were primarily composed of styrene, with the presence of alkenes and aromatic hydrocarbons, confirming the simultaneously degradation of nanoplastics and the regeneration of the biochar adsorbent.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
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IF 8
Xin Li,Aiyu Niu,Shanshan Yang,Fei Liu
Determining the contaminants reduction rate by dissolved ferrous iron (Fe(II) aq ) bound to iron oxides is curial for evaluating the abiotic attenuation of contaminants in aquifers. However, few studies have assessed the contaminants reduction rate controlled by thermodynamic parameters in heterogeneous systems with different iron oxides. In this study, a linear free energy relationship (LFER) was established between the nitrobenzene reduction rate and the thermodynamic driving force (reduction potential (E H ) and pH) in Fe(II) aq -goethite-hematite co-existing systems. Results showed that the reduction rate of nitrobenzene correlated with the E H of the heterogeneous system. The standard reduction potential (E H 0 mix ) of the mixed iron oxides could be obtained by a proportionate linear combination of the single iron oxide system E H 0 . Based on this, the E H of the heterogeneous systems could be calculated theoretically by combining E H 0 mix and the Nernst equation. Furthermore, a parallel LFER with the slope of 1 was established to associate the nitrobenzene reduction rate with E H and pH. The intercept term was related to the adsorption capacity of different iron oxides towards Fe(II) aq . The Fe(II) aq saturation adsorption capacity of hematite was 1.5 times higher than that of goethite. After normalizing the nitrobenzene reduction rate to the Fe(II) aq saturation adsorption capacity, the maximum difference in intercept terms was reduced from 37% to 15%. These findings would provide an important and feasible methodological support for the quantitative evaluation of abiotic attenuation of contaminants in groundwater.
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Heliyon
·
2024
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IF 3.4
Lijuan Feng,Jie Liu,Shizhao Wang,Yingying Zhao,Fei Li,Xiaofu Guo,Junsheng Yuan
Sulfite oxidation is critical for the stable operation of desulfurization process and the treatment & recovery of desulfurization by-products. The Fe and Co oxides modified super hydrophobic layer was prepared on tubular ceramic membranes using hydrothermal synthesis and surface modifications to realize the combination of the membrane catalysis and membrane aeration. These two oxides were approximately two-layer distributed on the membrane surface, among which the Fe 2 O 3 located in the bottom layer and the Co 3 O 4 located in the upper layer. The catalytic rate of the bifunctional membrane was about 5.8 times than that of the original ceramic membrane, which was decreased with the increasing of Fe/Co ratio and declined after an initial rise with the increase of urea and cetyltrimethylammonium bromide. The conjoint effect of Fe and Co could improve the catalytic performance and reduce the dissolution loss of catalyzer. The oxidation rate tended to be constant after a 15 % decrease in 7 times experiments.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Zimo Lou,Ludi Song,Xuanlong Zhang,Xiaofei Wen,Dong Cheng,Jianming Yu,Xinhua Xu
Exogenous ferrous ion dosing allows depassivation of aged zerovalent iron (ZVI) for industrial wastewater treatment, while sustaining the persistent existence of Fe(II) species for continuous depassivation throughout decontamination remains challenging. To tackle this dilemma, pre-oxidized microscale ZVI (poZVI bm ) is proposed via ball milling with peroxydisulfate (PDS) solids, for tailoring an “continuous self-driven depassivation” scenario with Fe 0 /Fe(II) symbiosis. The poZVI bm exhibits a 4.4 ∼ 19.0 times higher equilibrated adsorption capacity for hexavalent chromium (Cr(VI)) than the referenced ball milled ZVI (ZVI bm ) and other benchmarked mZVI composites (e.g. oxalated ZVI bm , sulfidized ZVI bm , and nanoscale ZVI), following a chemisorption-reduction process. It also demonstrates a 4.5 ∼ 18.7 folds faster surface area-normalized removal rate for nitrobenzene (NB) than all these counterparts, mediated by reductive transformation. Cr(VI) removal and NB reduction depend on the dissolved and surface-sorbed Fe(II), respectively, which can be optimized by regulating pre-oxidation degree of poZVI bm . The “continuous self-driven depassivation” of poZVI bm starts with the local microenvironment acidification due to the adsorption of abundant dissolvable Fe(II) over surface-located Fe(III), which drives continuous dissolution of Fe 0 core to create more reactive Fe(II), and therefore repeats the above procedure. Owing to wide pH adaptability (pH 3 ∼ 9) and impressive corrosion behavior of poZVI bm , these findings inspire the intimate integration of Fe 0 /Fe(II) component for high-efficient remediation of multicomponent industrial wastewater.
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ENVIRONMENTAL POLLUTION
·
2024
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IF 7.6
Miaofei Sun,Sajjad Ali,Chengyin Liu,Chunhui Dai,Xin Liu,Chao Zeng
In this work, a series of hydrogenated Fe-doped AgIO 3 (FAI-x) catalysts are synthesized for photodegrading diverse azo dyes and antibiotics. Under the irradiation of natural sunlight with a light intensity of ∼60 mW/cm 2 , the optimum FAI-10 exhibits a considerable rate constant for decomposing methyl orange (MO) of 0.067 min −1 , about 7.4 times higher than that of AgIO 3 (0.009 min −1 ), and 24.6% and 83.8% of MO can be decomposed over AgIO 3 and FAI-10 after irradiation for 40 min. In the amplification photodegradation experiments with using 0.5 g catalyst and 400 mL MO dye solution (10 mg/L), FAI-10 possesses greatly higher photoreactivity to common semiconductors (ZnO, TiO 2 , In 2 O 3 and Bi 2 MoO 6 ), and the photodegradation rates over FAI-10 are 92%. Particularly, the FAI-10 shows superior stability, the activity of which remains unaltered after 8 continuous cycles. Foreign ions and water bodies have slight effect on the activity of FAI-10, but the MO degradation rates are decreased by adjusting pH values, especially when pH = 11 because of the strong electrostatic repulsion between MO and FAI-10. FAI-10 can also effectively decompose another azo dye (rhodamine B (RhB)) and diverse antibiotics (sulflsoxazole (SOX), chlortetracycline hydrochloride (CTC), tetracycline hydrochloride (TC) and ofloxacin (OFX)). The activity enhancement mechanism of FAI-10 has been systemically investigated and is ascribed to the promoted photo-absorption, charge separation and transfer efficiency, and affinity of organic pollutants , owing to the synergistic effect of Fe doping and oxygen vacancy (Ov). The photocatalytic mechanisms and process for decomposing MO are verified and proposed based on radical trapping experiments and liquid chromatography-mass spectrometry (LC-MS). This work opens an avenue for the fabrication of effective photocatalysts toward water purification .
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ChemPlusChem
·
2024
·
IF 3
Meng-Ge Wei,Hong-Ru Li,Liang-Nian He
Graphical A series of solid base KF/Mg-Fe bi-metal oxides were fabricated via supporting KF on Mg-Fe bi-metal oxides and calcination. When applied as catalyst to dimethyl carbonate (DMC) synthesis through transesterification of ethylene carbonate (EC) and methanol, this material can afford up to 88 % yield and 97 % selectivity toward DMC in the optimal conditions. It is worth noting that the catalyst can be easily separated by filtration and reused. A series of KF/Mg-Fe oxides were fabricated via the solid-state reaction between KF and Mg-Fe oxides. Especially, when 20 wt % KF was supported on the Mg-Fe bi-metal oxides and calcined at 400–600 °C, the solid material with more basic sites than the support itself was obtained. When applied as catalyst to dimethyl carbonate (DMC) synthesis through transesterification of ethylene carbonate (EC) and methanol, this material can afforded up to 88 % yield and 97 % selectivity toward DMC in 2 h under reflux conditions with the molar ratio of methanol to ethylene carbonate set at 8. It is worth noting that the catalyst was easily separated and reused, retaining at least 89 % catalytic activity during the first four recycles. Although an attenuated activity was still observed due to the inevitable filtration loss and dissolution, this solid base can still provide clues to the development recyclable catalyst in green synthesis of DMC.
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