APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Ruyi Wang,Xianfeng Liu,Fu Yang,Shuying Gao,Shijian Zhou,Yan Kong
Herein, we report an efficient controlled approach to reach the synergetic neighboring dual-metal active sites in the confined mesopore of silica. In this approach, Mn-bearing mesoporous molecular sieve was designed in advance via a metal-assisted in-situ assembly route and further employed as a starting carrier to accommodate more extraneous Cu by impregnation. Controlling copper loading (Cu/Mn = 0.2, 0.4, and 0.6), comparative catalysts were attained and precisely characterized by key physicochemical methods. Impressively, in-situ formed highly-dispersed MnO x covered on the mesopore become the prerequisite for producing interplayed active species with neighboring dual Cu-Mn sites. Catalytic results concerning styrene epoxidation together with DRIFTS experiments and calculated bond energy variation in expected reaction intermediates demonstrated the existed synergy derived from formed neighboring Cu-Mn species via weakening and reinforcing appointed chemical bonds in intermediates. This study provides the foreseeable possibility for attaining universal synergetic catalysts in industrial heterogeneous catalysis.
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CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Zimo Lou,Zhen Cao,Jiang Xu,Xiaoxin Zhou,Jin Zhu,Xue Liu,Shams Ali Baig,Junliang Zhou,Xinhua Xu
In this study, reduced graphene oxide (RGO) and different stabilizers (hexadecyltrimethylammonium bromide, starch, and carboxymethyl cellulose) were applied to simultaneously support and stabilize Fe-Mn binary oxide (FeMnO x ) nanohybrids, and enhanced removal of As(III)/(V) from water was achieved. TEM images shows that the aggregation of FeMnO x on RGO was effectively inhibited after the starch stabilization, meanwhile, the loading of FeMnO x on RGO was also increased. The adsorption capacity of As(III) and As(V) on starch-FeMnO x /RGO via Langmuir isotherm model was 78.74 mg g −1 and 55.56 mg g −1 , respectively, which was 1.99 and 2.39 times higher than bare FeMnO x . The adsorption kinetics was well fitted by the pseudo-second-order model. The effects of initial pH and coexisted anions were investigated. Over 90% of As(III) and As(V) could be removed by starch-FeMnO x /RGO during the five consecutive adsorption-desorption cycles. The results revealed the potential of the RGO supported and starch stabilized FeMnO x as an efficient adsorbent for arsenic removal from water.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yumeng Lian,Yi Wang,Dun Zhang,Likun Xu
Developing a stable and reusable material for antibacterial application in an enzyme-like system is still a challenge. Herein, Mn–Co–S–Se (MnCo 2 S x Se 4–x )/Ni foam (NF) are synthesized by introducing S 2– and Se 2– in MnCo 2 O 4 /NF with a facile hydrothermal approach. With the different molar ratios of S/Se, the surface morphology of MnCo 2 S x Se 4–x /NF shows different growth and the catalytic activity also presents regular changes. MnCo 2 S 3.1 Se 0.9 /NF possesses a high enzyme-like ability with higher V max than natural horseradish peroxidase . Due to the outstanding peroxidase-like activity, MnCo 2 S 3.1 Se 0.9 /NF also exhibits broad-spectrum bactericidal performance towards Escherichia coli and Staphylococcus aureus which stems from the formation of ·O 2 – from H 2 O 2 . In the reutilization experiment, the enzyme-like activity keeps a stable value after 25 cyclic tests and the bactericidal performance is still stable after 10 cyclic tests, proving that MnCo 2 S 3.1 Se 0.9 /NF possesses relative stability and reusability. This research showed the great prospect of new energy and environmental catalysis.
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Journal of Cleaner Production
·
2021
·
IF 9.297
Chuankun Yin,Siji Zhou,Keyi Zhang,Jiale Bai,Yangyang Lv,Xuewen Zhang,Xiaoxia Li,Aihua Xu
p-Nitrophenol (PNP) is one of the highly toxic and mutagenic pollutants existed in aquatic environment. In this work, the crednerite CuMnO 2 nanoflake was prepared and used to degrade PNP with peroxymonosulfate (PMS) as the oxidant. It was found that CuMnO 2 exhibited much higher activity than other Cu-based catalysts such as CuO, Cu 2 O, CuFe 2 O 4 and CuFeO 2 , with 90% of PNP degraded after 10 min under mild reaction conditions. The catalyst was also stable during five successive runs. Sulfate and hydroxyl radicals produced from PMS reduction by Cu(I) species, as well as superoxide ions and single oxygen, contribute to the degradation of PNP. More importantly, the interactions between Mn and Cu species in CuMnO 2 were identified by X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FT-IR) and linear sweep voltammetry (LSV), and were further confirmed by the control experiment with the mixture of Cu 2 O + Mn 2 O 3 . The results implied that the high valent Mn(III) species acted as Lewis acids to withdraw electron from PMS, resulting that the Cu(I) species can be easier oxidized to Cu(II) by PMS with the formation of radicals. These findings provide an ideal bimetallic heterogeneous catalyst and a new mechanism for PMS-mediated reaction.
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Journal of Environmental Sciences
·
2025
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IF 6.3
Wei Jia,Jianxun Bao,Hebi Zhang,Min Wu,Jianbei Qiu,Hao Wu,Yingjie Zhang
Halide perovskite materials have received considerable attention for solar cells, LEDs, lasers etc. owing to their controllable physicochemical properties and structural advantages. However, little research has focused on energy storage and conversion applications, such as use as anodes in lithium-ion batteries. In this paper, all-inorganic lead-free halide perovskite Cs 3 Bi 2 Cl 9 powders were synthesized by the grinding method, and the lattice was successfully adjusted via introducing Mn 2+ . The characterization results show that Mn-ion substitution can cause local lattice distortion to restructure the lattice, which will cause a mixed arrangement of [BiCl 6 ] octahedra to improve the performance of the anode material. This new material can provide a feasible solution for solving the problem of low specific capacity anode materials caused by unstable crystal structures, and also indicates that such perovskites with unique crystal structures and lattice tunability have broad application prospects in lithium-ion batteries.
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ENVIRONMENT INTERNATIONAL
·
2025
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IF 9.7
Jiaqi Shi,Yan Li,Qi Wei,Xin Zhu,Shaohua Cao,Wenyi Xie,Yang Guo,Jing Wei,Zekai Li,Tao Long
The widely used rubber antioxidant N-(1,3-Dimethylbutyl)-N’-phenyl-p-phenylenediamine (6PPD) and its ozonated product, 6PPD-quinone (6PPD-Q), are highly toxic to aquatic life, yet understanding on their environmental behaviors is limited. This study comprehensively investigated their adsorption and transformation processes on natural Fe-Mn nodules (NFMN), which commonly exist in sediments and soils through a combination of diverse experimental and computational methods. The maximum adsorption capacity of 6PPD-Q (719.2 μg·g −1 ) is significantly higher than that of 6PPD (133.8 μg·g −1 ) at 293 K, and it is more difficult to desorb. They follow different kinetic and isothermal adsorption models, and environmental conditions (including temperature, pH, and anions) exert distinct influences on the adsorption of the two substances. Adsorption mechanisms involving electrostatic attraction, charge transfer, hydrogen bonding, and Lewis acid-base complexation were unveiled. For 6PPD, electrostatic adsorption and Lewis acid-base complexation contribute significantly to its adsorption. Conversely, for 6PPD-Q, the contribution of Lewis acid-base complexation outweighs that of hydrogen bonding, while the effect of electrostatic adsorption is relatively negligible. The stronger electrostatic attraction, more efficient charge transfer, and a greater number of binding sites for hydrogen bonding and Lewis acid-base complexation with NFMN results in more robust adsorption of 6PPD-Q. Furthermore, 6PPD can transform into 6PPD-Q on NFMN, facilitated by dissolved Mn(III). This study advances understanding of the adsorption behavior and mechanism of 6PPD and 6PPD-Q, and highlights a new pathway for 6PPD-Q formation, which provides valuable reference for assessing the water body exposure risks and formulating environmental remediation strategies for such pollutants. Environmental Implication This study offers the first comprehensive insight into the interactions between 6PPD/6PPD-Q and NFMN, illuminating their environmental behavior in water and soil systems. It reveals the adsorption discrepancy between 6PPD and 6PPD-Q, and elucidates the mechanisms underlying the difference in adsorption. Additionally, it uncovers a novel pathway for 6PPD-Q formation, offering valuable implications for risk assessment and environmental remediation strategies.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jian Deng,Chunhao Wang,Shenggui Ma,Chengchao Liu,Yongtao Zheng,Haipeng Chen,Ruofei Chen,Siyu Wei,Shanbi Peng,Xia Jiang
In this study, Cu 1.5 Mn 1.5 O 4 spinel with Mn(Ⅳ)O 6 coordination was synthesized by evaporation and combustion method. CuMn-500-1 catalyst was obtained by acid etching, which significantly promotes the catalytic oxidation of toluene (lowering ≈ 30℃ regarding T 100 ). Characterization results demonstrate that the enhanced performance can be attributed to the increased exposure of (222) crystal facet of a more rod-like Cu 1.5 Mn 1.5 O 4 spinel, independent of surface area and oxygen vacancy (which remained almost unchanged). In addition, the rate-determining steps were proved to be the ring-opening reaction of phenol by in-situ DRIFTS experiment. Density functional theory calculation further shows that the Mn(Ⅳ)O₆ site exhibits stronger capacity for toluene adsorption. In addition, the main cause underlying the enhanced performance of CuMn-500-1 is further corroborated: specifically, the (222) crystal surface demonstrates stronger catalytic performance compared to other crystal faces. This strategy provides a new method in enhancing the VOCs removal efficiency of catalyst.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Changpeng Xian,Ruilin He,Qianwei Chen,Qiulin Li,Yandong Ma,Shu-juan Bao,Wei Sun,Hao Chen,Maowen Xu
Aqueous rechargeable zinc-manganese batteries (AZMBs) are strong candidates for the next generation of energy storage technologies. However, poor cycling stability has greatly limited the commercialization process of AZMBs. The irreversible dissolution and low utilization of manganese-based cathodes impact cycling stability. Therefore, this work proposes a cathode for electrolytic zinc-manganese battery, where cobalt and nitrogen co-doped porous carbon with catalytic and adsorptive properties is grown on carbon nanotube films (CoNC-CFs). Through a synergistic approach of ion adsorption and catalytic conversion, it significantly enhances the reversible conversion efficiency of Mn 2+ /MnO 2 , leading to long-term cycling stability for AZMBs. This strategy utilizes the catalytic effect of cobalt to promote the uniform deposition of Mn 2+ during the charging process and ensures the efficient dissolution of the deposited material during discharge, thus achieving over 1300 reversible cycles at 1 mA cm −2 in a near-neutral sulfate electrolyte. This method offers new perspectives for the further development and application of AZMBs.
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MOLECULES
·
2024
·Vol. 29
·期 9
·1946
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IF 4.2
Yan Ma,Kai Wang,Sikai Liang,Zhongqing Li,Zhiyuan Wang,Jun Shen
The Mn-Fe oxide material possesses the advantages of abundant availability, low cost, and non-toxicity as an energy storage material, particularly addressing the limitation of sluggish reoxidation kinetics observed in pure manganese oxide. However, scaling up the thermal energy storage (TCES) system poses challenges to the stability of the reactivities and mechanical strength of materials over long-term cycles, necessitating their resolution. In this study, Mn-Fe granules were fabricated with a diameter of approximately 2 mm using the feasible and scalable drop technique, and the effects of Y2O3-stabilized ZrO2(YSZ) and SiO2doping, at various doping ratios ranging from 1–20 wt%, were investigated on both the anti-sintering behavior and mechanical strength. In a thermal gravimetric analyzer, the redox reaction tests showed that both the dopants led to an enhancement in the reoxidation rates when the doping ratios were in an appropriate range, while they also brought about a decrease in the reduction rate and energy storage density. In a packed-bed reactor, the results of five consecutive redox tests showed a similar pattern to that in a thermal gravimetric analyzer. Additionally, the doping led to the stable reduction/oxidation reaction rates during the cyclic tests. In the subsequent 120 cyclic tests, the Si-doped granules exhibited volume expansion with a decreased crushing strength, whereas the YSZ-doped granules experienced drastic shrinkage with an increase in the crushing strength. The 1 wt% Si and 2 wt% Si presented the best synthetic performance, which resulted from the milder sintering effects during the long-term cyclic tests.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Yuxi Zhang,Yamin Deng,Jiangkai Xue,Yihan Cheng,Yulun Nie,Kunfu Pi,Yao Du,Xianjun Xie,Jianbo Shi,Yanxin Wang
The environmental fate of arsenic (As) relies substantially on its speciation, which occurs frequently coupled to the redox transformation of manganese. While trivalent manganese (Mn(III)), which is known for its high reactivity, is believed to play a role in As mobilization by iron (oxyhydr)oxides in dynamic aquifers, the exact roles and underlying mechanisms are still poorly understood. Using increasingly complex batch experiments that mimick As-affected aquifer conditions in combination with time-resolved characterization, we demonstrate that Mn(III)-NOM complexes play a crucial role in the manganese-mediated immobilization of As(III) by ferrihydrite and goethite . Under anaerobic condition , Mn(III)-fulvic acid (FA) rapidly oxidized 31.8% of aqueous As(III) and bound both As(III) and As(V). Furthermore, Mn(III)-FA exerted significantly different effects on the adsorption of As by ferrihydrite and goethite. Mn(III)-FA increased the adsorption of As by 6–16% due to the higher affinity of oxidation-produced As(V) for ferrihydrite under circumneutral conditions. In contrast, As adsorption by crystalline goethite was eventually inhibited due to the competitive effect of Mn(III)-FA. To summarize, our results reveal that Mn(III)-NOM complexes play dual roles in As retention by iron oxides , depending on the their crystallization. This highlights the importance of Mn(III) for the fate of As particularly in redox fluctuating groundwater environments.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zerui Chen,Yingxinjie Wang,Jie Wang,Xiaohui Li,Guohao Li,Ziying Zhang,Zhenjun Wu,Xiuqiang Xie,Nan Zhang
Manganese-based Prussian blue analogues (PBA) have garnered widespread attention as the promising cathode materials for sodium-ion batteries. However, the inevitable Jahn-Teller distortion and the formation of unstable and uneven cathode electrolyte interphase (CEI) result in severe Mn dissolution and poor cycling stability. Herein, we report a simple MXene modification strategy cold pressing method to embed Prussian blue cathode materials into MXene nanosheets. This highly conductive protective barrier not only mitigates the Jahn-Teller distortion in Mn-PBA and maintains the integrity of the particles during charge–discharge cycles, but also partially suppresses side reactions between the electrolyte and cathode interface through surface functional groups (−F), resulting in a thin and uniform CEI. The protection of the stable CEI and MXene nanosheets simultaneously alleviate the Jahn-Teller effect and suppress the Mn dissolution during long cycling, thus allowing the cathode material to retain ∼ 80 % of its capacity after 1000 cycles at a current density of 1000 mA g −1 . This study highlights the importance of stabilizing the cathode interface and provides a novel approach for preparing highly stable manganese-based PBA cathode.
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WATER RESEARCH
·
2025
·
IF 12.4
Jung-Hyun Son,Wen-Long Wang,Peng-Hui Liu,Hang Su,Ju-Won Lee,Min-Yong Lee,Qian-Yuan Wu
This study investigates the enhancement of ozonation efficiency through the introduction of manganese ions (O 3 /Mn(II)) that significantly improve the degradation of ozone-persistent organic pollutants. Manganese ions accelerate hydroxyl radical generation by catalyzing ozone decomposition, thereby facilitating more effective oxidative reactions. The application of O 3 /Mn(II) to degrade N, N-Diethyl-3-toluamide (DEET) achieved a decomposition efficiency of 3.6 to 4.1 times higher than ozonation alone. The promotive effect was highly pH-dependent, with the observed rate constant ( k obs ) for O 3 /Mn(II) reaching 97.05 M −1 s −1 at pH 4, approximately 3.3 times greater than ozonation alone, and 686.93 M −1 s −1 at pH 7, around 1.7 times higher. O 3 oxidation contributed approximately 1% to the overall process, while hydroxyl radicals accounted for approximately 80%, and manganese species accounted for approximately 20%. Furthermore, the oxidation state of manganese significantly influenced the cooperative oxidation efficiency, with Mn(VII) achieving the highest k obs (680.87 M −1 s −1 ), while Mn(IV) exhibited the lowest (304.6 M −1 s −1 ). Additionally, intermediate products formed during DEET oxidation were identified using Orbitrap technology, elucidating various degradation pathways (such as decarboxylation, tri-hydration, and aromatic ring opening). These findings provide valuable insights into enhancing ozonation processes for environmental remediation.
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