NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yanhua Ma,Jialu Wang,Xiangli Li,Yongfeng Qiao
Epoxidation reactions with hydrogen peroxide serving as the oxidant have a crucial position in the realm of organic chemistry. Here in, the five inorganic-organic hybrid compounds ([Mn(Salen-X)]4[SiW12O40], namely 1 X=H, 2 X=Me, 3 X=tBu, 4 X=Cl, 5 X=Br) were employed as catalysts in the epoxidation of cyclohexene, with hydrogen peroxide serving as the oxidant. Cyclohexene exhibited a conversion of 72.0% and a selectivity of 99.3% toward cyclohexene oxide under mild conditions (20 °C) and in a short reaction time (60 min). The results of UV-vis spectroscopy and electrochemical analyses indicated that the Mn(Salen) moiety acts as the catalytic centre, and the [SiW12O40]4−(SiW12) polyanion promotes electron transfer, thereby guaranteeing the stable catalytic activity of the Mn(Salen) moiety. Thorough characterization studies elucidated the mechanism responsible for the catalytic activity of Mn(Salen) and polyoxometalate-based inorganic-organic hybrid materials. This study provides important theoretical foundations and practical experience for the development of more efficient Mn(Salen)-POM-based catalysts for the green epoxidation of cyclohexene, and offers theoretical basis for the development of efficient and environmentally-friendly olefin epoxidation processes..
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Wensheng Lei,Minglin Sun,Wenliang Zhang,Liuan Liang,Zhezheng Ding,Xiao Tang,Haonan Dai,Xiaomin Liu,Pengfei Qi,Yan Wang
The efficient and sustainable removal of hexavalent chromium (Cr(VI)) from wastewater is a critical challenge in environmental engineering. Herein, an ultra-stable and recyclable cellulose nanofiber-based composite membrane (CNF@MN@MX) was fabricated via vacuum-assisted filtration by integrating cellulose nanofibers (CNFs), indium-based metal-organic frameworks (MIL-68(In)-NH₂, MN), and Ti₃C₂Tₓ MXene (MX). The CNFs provide a robust structural scaffold, MN imparts visible-light photoactivity, and MX establishes a highly conductive network that facilitates charge separation and transport. Comprehensive structural and photoelectrochemical characterizations confirmed strong interfacial coupling among the three components, leading to enhanced electron mobility and light-harvesting capacity. The optimized CNF@MN@MX membrane (mass ratio CNF:MN:MX = 1:1:1) exhibited a specific surface area of 22.65 m 2 /g, a maximum Cr(VI) adsorption capacity of 17.79 mg/g, and nearly complete Cr(VI) reduction under visible-light irradiation. Notably, the membrane retained over 70% removal efficiency after 20 regeneration cycles and maintained excellent performance in the presence of common anions. Density functional theory (DFT) calculations revealed that MX incorporation lowered the Gibbs free energy of Cr(VI) reduction from −1.19 to −1.72 eV, confirming the thermodynamic advantage of MX-facilitated electron transfer. Furthermore, the CNF@MN@MX membrane efficiently purified simulated industrial effluents, yielding residual Cr(VI) concentrations below the regulatory limit. This work provides a robust design strategy for constructing conductive, photoactive, and recyclable membrane systems for advanced heavy-metal wastewater treatment.
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Sustainable Materials and Technologies
·
2026
·
IF 9.2
Rumeng Ye,Kai Tian,Yingzhe Xu,Jianbiao Peng,Xingbing He,Minjie Deng,Xueying Chu
Current studies involve excessively complex synthesis of metal-modified biochar for the adsorption of tetracycline hydrochloride (TC), focusing on the effects of a single strategy and neglecting systematic comparisons. For environmental sustainability, Fe₃O₄/MnOₓ-modified rice husk biochar (BC) was simply synthesized by impregnation-precipitation. Batch adsorption experiments were conducted on BC, Fe-modified (BC-Fe), and KMnO 4 -modified (BC-Mn) biochars to assess their TC removal efficiency. The mechanisms were investigated by FTIR, XRD, XPS, and UV–vis. Results demonstrated BC-Fe and BC-Mn exhibited significantly enhanced TC adsorption capacities compared with BC (170.06/266.94/132.86 mg/g, respectively). This improvement is attributed to increased specific surface area, refined microporous architecture, enriched O-containing functional groups, and the incorporation of Fe 3 O 4 /MnO x nanoparticles. Divergent adsorption behaviors were observed: BC-Fe operates through an endothermic process dominated by diffusion, pore filling, electrostatic adsorption, coordination interactions, and hydrogen bonding; this process is pH-sensitive and further promoted by the presence of SO 4 2− , PO 4 3− and CO 3 2− ions. In contrast, BC-Mn exhibits a stable adsorption mechanism minimally affected by pH or ionic composition, combining diffusion, pore filling, and hydrogen bonding with catalytic oxidation (Mn (III), Mn (IV)) that disrupts and degrades the conjugated structure of TC. Fe/Mn-modified adsorption guides TC targeted remediation and rice husk sustainable utilization. By converting agricultural byproducts into high-performance environmental remediation materials, this study advances the ecological circular economy, realizing the dual value of waste recycling and pollution control.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·Vol. 47
·期 47
·20561-20571
·
IF 7.139
Tianyu Ai,Jing Li,Shuai Nie,Yansheng Yin,Jinlin Lu,Shuo Bao,Ling Yan
Transition elements doping metal oxide is of great significance for developing gas sensors with high performance. To achieve this goal, α-Fe 2 O 3 rod and Mn-doped α-Fe 2 O 3 polyhedrons are successfully synthesized by a facile N, N-dimethylformamide assisted hydrothermal method and characterized by several physical techniques. The morphology of α-Fe 2 O 3 is evolved by introducing Mn elements. The performance of the α-Fe 2 O 3 rod and Mn-doped α-Fe 2 O 3 polyhedrons as H 2 gas sensors are studied and compared. The Mn/α-Fe 2 O 3 -5 polyhedrons sensor exhibit the best performance at optimum operating temperature of 300 °C. The response and recovery times are 10 s/24 s for H 2 with a concentration of 200 ppm, which is much faster in contrast to those recently reported H 2 gas sensors. Furthermore, α-Fe 2 O 3 rod and Mn-doped α-Fe 2 O 3 polyhedrons show abnormal n-p transition sensing behavior with the change of operating temperature. This work provides a facile method for synthesizing α-Fe 2 O 3 based sensing materials for various sensors applications.
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Coatings
·
2026
·Vol. 16
·期 10
·1160
·
IF 3.4
Jiujie Xu,Fugang Lu,Mengchun Fu,Tiesong Lin,Fei Long,Yongkang Dong,Ce Wang,Panpan Lin,Peng He
Mn-based disordered rock-salt (DRX) cathode materials offer high theoretical capacities and operating voltages, rendering them promising candidates for high-energy-density lithium-ion batteries. However, severe interfacial reactions between Mn-based DRX cathodes and the electrolyte can induce surface degradation and a pronounced increase in interfacial impedance. In this study, a LAGP glass ceramic coating layer was introduced onto the surface of Li1.2Cr0.3Ti0.3Mn0.3O1.9F0.1(LCTMOF) particles to minimize direct contact between the active material and the electrolyte, thereby enhancing the capacity retention over 50 cycles. It delivered an initial discharge capacity of 278.7 mAh g−1and retained 227.3 mAh g−1after 50 cycles. Relative to the pristine uncoated cathode, the LAGP glass ceramic coating material achieved a capacity retention of 81.5% together with improved rate performance, retaining a high specific capacity of 184.5 mAh g−1at a current density of 500 mA g−1. Surface XPS analysis, together with the electrochemical results, suggests that the LAGP glass ceramic coating mitigates cathode interfacial degradation under the investigated cycling conditions.
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International Journal of Self-Propagating High-Temperature Synthesis
·
2026
·Vol. 35
·期 3
·165-172
·
IF 0.6
Kim S.-J.,Kim R.-J.,Sin C.-N.,Rim T.-S.
ZnO-based pigments doped with Co and Mn ions were synthesized via a self-propagating combustion method using Gingko biloba leaves as a bio-derived fuel. Thermogravimetric analysis confirmed an effective combustion interaction between the metal nitrates and the leaf-derived fuel, validating the combustion synthesis process. X-ray diffraction results revealed the formation of single-phase hexagonal wurtzite ZnO for all samples, with successful incorporation of dopant ions without secondary phase formation. The synthesized powders exhibited porous agglomerated morphologies resulting from gas evolution during the combustion process, while FTIR analysis confirmed the formation of Zn–O bonds and the effective removal of organic species after calcination. Optical characterization demonstrated that transition-metal doping significantly modifies the visible and near-infrared reflectance properties of ZnO pigments, producing green Co-doped and black-brown Mn-doped pigments with relatively high NIR solar reflectance. These results indicate that bio-fuel-assisted combustion synthesis provides a simple and effective route for producing functional ZnO-based pigments with tunable optical properties for potential application in thermally functional coating materials.
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ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2026
·Vol. 48
·期 6
·250
·
IF 4.3
Ma Chuang,Liu XueMei
Lead (Pb) and cadmium (Cd) in soil threaten agroecosystem safety and human health. Due to the high bioavailability and mobility of heavy metals in red soil, the risk is further increased. Biochar is widely used for heavy metal immobilization, but original biochar suffers from inherent limitations. Most existing studies of iron (Fe)–manganese (Mn) modified biochar have not focused on red soil, and the relationship with soil–plant responses remains unclear. This study aimed to evaluate and compare the efficacy of sugarcane bagasse biochar (BC) and Fe–Mn modified sugarcane bagasse biochar (FMBC) for Pb and Cd immobilization in red soil, and clarify their effect on plant uptake. BC and FMBC were applied to Pb and Cd contaminated red soil for pot experiments with pak choi ( Brassica rapa chinensis ) as an indicator plant. The results showed that both BC and FMBC elevated soil pH, organic matter (SOM), enzyme activities, reduced Pb and Cd bioavailability, and transformed Pb and Cd to stable fractions. FMBC outperformed BC, and the 5% FMBC treatment achieved the optimal remediation efficacy. The 5% FMBC decreased the acid-extractable Pb and Cd by 9.33 and 34.40% compared to control. The plant biomass was significantly increased, Pb and Cd content in edible shoots met the limit standards, and bioconcentration (BCF) and translocation factors (TF) were lowered. Overall, this study establishes theoretical foundations and empirical bases for the application of FMBC to immobilize Pb and Cd in red soils, thereby providing a feasible and eco-friendly approach to support sustainable agriculture and the recycling of agricultural waste.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2026
·
IF 7.9
Fan Pan,Yang Xu,Huan Liu,Yuming Cheng,Jianjun Zhou,Kerun Yang,Yang Zhao,Hongkun Ma,Furong Zhang,Shengkai Cao
Building upon a diagnostic assessment of nitrogen and phosphorus pollution in the Jingzhou Moat, this work developed a novel Fe-Mn oxide composite for the targeted removal of nitrate. An assessment of the water quality revealed a typical pattern of low phosphorus and high nitrogen pollution, with nitrate being the predominant contaminant. A novel Fe-Mn oxide modified activated carbon (FeMnAC) composite with a well-anchored MnFe 2 O 4 spinel structure was synthesized using a controlled activation, impregnation, and calcination procedure. The composite has an increased point of zero charge (pH 9.6), allowing for excellent nitrate adsorption throughout a wide pH range (2∼10). The adsorption process follows the Langmuir monolayer chemisorption model, with a maximum adsorption capacity of 23.19 mg·g −1 . FeMnAC demonstrated exceptional selectivity in the presence of competing anions like PO 4 3– while achieving highly efficient nitrate removal in real moat water samples in 120 min. After four regeneration cycles using NaCl, the adsorbent showed good reusability, retaining more than 50% of its initial capacity. This work offers a transferable methodological framework for nitrogen pollution control in similar heritage urban water systems by combining pollution diagnosis, targeted material design, and practical validation.
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RESOURCES CONSERVATION AND RECYCLING
·
2026
·
IF 10.4
Tianshu Bao,Congcong Li,Chenye Wang,Huiquan Li,Liangbin Li,Zhenhua Sun,Lili Yu,Xinjuan Hou,Aiping Peng,Ming Ye
Global lithium demand has heightened interest in direct extraction from salt-lake brine. Mn-based ion sieves (HMOs) offer high capacity, fast kinetics, and low cost but suffer from Mn dissolution. This study reports a low-dissolution HMO@Hy sieve prepared via hydrothermal carbon coating. The oxygen-rich carbon layer curbs metal leaching without performance loss seen in amorphous carbon coatings, reducing Mn dissolution from 2.01% to 1.06%. The material exists as loose powder with a uniform 2–3 nm coating and adsorbs 21.1 mg/g from real brine within one hour. First-principles calculations show the carbon-doped coating raises surface Mn valence, reducing charge density and limiting dissolution during desorption. Granulation and cycling tests confirm practical potential: one ton of adsorbent processes 114 tons brine weekly, yielding 0.49 tons Li₂CO₃ and ¥42,800 economic benefit. This non-metallic coating strategy enhances HMO stability for sustainable lithium recovery.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Shangyi Zhao,Jing Li,Yanchanjuan Yang,Shuaiqi Zhao,Aihua Xu,Xiuying Liu,Xiaoxia Li
Sulfite (SO 3 2− ) has emerged as an economical and eco-friendly precursor for reactive species generation in advanced oxidation processes (AOPs). However, conventional activation strategies typically require high sulfite inputs and generate non-selective radicals, limiting their efficiency and practicality. Here, we demonstrate that a trace amount of water‑soluble manganese porphyrin complex (Mn(III)‑TCPP, as low as 4 μM), can efficiently activate Na 2 SO 3 at ultralow concentrations (10–100 μM) to degrade sulfadiazine. The Mn(III)-TCPP/Na 2 SO 3 system exhibited an initial rate 41 times faster than the Mn 2+ /Na 2 SO 3 system and 4.2 times greater than the reported -Mn(III)-NTA/Na 2 SO 3 system. A linear correlation between the degradation rate constant and the Hammett constant (σ + ) of porphyrin substituents confirms that ligand electronic structure modulates Mn redox cycling during SO 3 2− oxidation by dissolved O 2 . Mechanistic studies, including time‑resolved spectroscopy, electrochemical analysis, and reactive species trapping, reveal that the reaction proceeds primarily via superoxide radical and singlet oxygen, representing a distinct departure from conventional sulfate radical or high-valent Mn(V) that has been reported in other metal–ligand AOP systems. This work establishes a new, highly efficient sulfite activation driven by an ultralow-dose metalloporphyrin catalyst and provides fundamental insight into non‑radical oxidation routes for sulfite-based AOPs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Songtao Dong,Tian-yu Zhang,Jing Luan,Honglei Wang,Lei Wang,Hongbo Ju
As a viable p-type thermoelectric (TE) material, Cu 2 SnSe 3 has attracted increasing attention, primarily due to its moderate band gap and tunable electronic structure. Nevertheless, its practical TE utilization is significantly limited by its inherently high lattice thermal conductivity ( κ l ) and suboptimal power factor. Herein, a Fe/Mn co-doping strategy is proposed to concomitantly regulate electrical and thermal transport properties, thereby achieving a remarkable improvement in the overall TE performance. A series of Cu 2 Sn 1–2x Fe x Mn x Se 3 (x = 0, 0.02, 0.04, 0.06) ceramic samples were fabricated via vacuum-based melting followed by hot-press sintering, which concurrently introduced abundant lattice defects and a CuSe secondary phase. These multi-scale structural features significantly enhance phonon scattering, causing a substantial reduction in thermal conductivity. Consequently, the total thermal conductivity of Cu 2 Sn 0.92 Fe 0.04 Mn 0.04 Se 3 is reduced to a minimum value of 0.432 W m −1 K −1 at 773 K. Meanwhile, Fe/Mn co-doping notably increases the charge carrier concentration ( n ), resulting in a dramatic enhancement in electrical conductivity—from 189.8 S cm −1 for Cu 2 SnSe 3 to 1381 S cm −1 for Cu 2 Sn 0.92 Fe 0.04 Mn 0.04 Se 3. Although the Seebeck coefficient exhibites a slight to moderate reduction, the significant increase in electrical conductivity prevails, yielding a substantially optimized power factor ( PF ). A maximum PF of 500.1 μW m −1 K −2 was achieved, together with a peak ZT value of 0.89 at 773 K, representing a 5.23-fold enhancement compared to the undoped Cu 2 SnSe 3 sample ( ZT = 0.17). In addition to enhancing thermoelectric performance, Fe/Mn co-doping significantly improves the mechanical of Cu 2 SnSe 3 . Specifically, the Young’s modulus ( E ) and hardness ( H ) of Cu 2 Sn 0.92 Fe 0.04 Mn 0.04 Se 3 increased by 18.2% and 25.2%, respectively, relative to the undoped sample—demonstrating markedly enhanced mechanical robustness. These results establish Fe/Mn co-doping as an effective and versatile strategy for decoupling electrical and thermal transport in Cu 2 SnSe 3 -based materials, thereby providing a promising pathway toward high-performance thermoelectric materials with superior structural integrity.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Ying Yan,Qianwen Zhang,Yuxin Shu,Zeyu Zuo,Shuoyue Li,Mama Embalo Samba,Wenxuan Xu,Lankun Cai
Photocathodic protection (PCP) provides a sustainable strategy for corrosion control, but conventional TiO 2 /CdS photoanodes remain limited by inefficient interfacial charge transfer and CdS photocorrosion. Herein, TiO 2 /Mn-CdS composite photoanodes were fabricated via anodic oxidation combined with the successive ionic layer adsorption and reaction (SILAR) method for the photocathodic protection of Q235 carbon steel (Q235 CS). The optimized photoanode, prepared using a 0.04 M Mn precursor solution (denoted as TiO 2 /Mn-CdS-0.04), exhibited a photocurrent density of 1590 μA·cm −2 . When coupled with Q235 CS, it induced a cathodic shift of the open-circuit potential to −1.30 V (vs. SCE) under visible-light irradiation. During a 24-day stability test, the photocurrent density remained above 1000 μA·cm −2 and the coupled potential remained approximately −0.95 V (vs. SCE). First-principles calculations indicated that Mn-induced electronic states facilitated carrier separation and interfacial charge transfer, suggesting that Mn incorporation promotes cascade charge transfer within the composite photoanode. This study demonstrates the potential of TiO 2 /Mn-CdS as a non-noble-metal photoanode for durable photocathodic protection of Q235 CS.
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危险品化学品经营许可证（带存储）