CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Qibin Zhu,Long Chen,Yun Da
The Calcium looping thermochemical reaction directly driven by solar energy effectively addresses the problem of efficient energy storage of concentrated solar power plants (CSP) by shortening the energy conversion path. But new requirements are put forward for energy storage materials, including high solar radiation absorption, high cycling stability and fast kinetics. To meet these challenges, we have designed porous microsphere structures for the purpose of enhancing mass transfer and the capture of solar radiation. Additionally, Zr and Mn oxides with elevated Tammann temperatures were incorporated to stabilize the morphology and prevent sintering. The synthesized porous microspheres retained abundant mesoporous channels on the surface even after undergoing 20 cycles. The addition of Mn oxide significantly enhances solar spectral absorptivity, achieving an impressive 82.88 % absorbance. The incorporation of Mn and Zr oxides increased the sintering resistance, specific surface area and porosity of CaO/CaCO 3 , especially in the 10–100 nm range, which accelerated the CO 2 transport during carbonation. These enhancements significantly improve the chemical control stage of the carbonation reaction, as further supported by kinetic models. After 50 cycle experiments at 800 °C, the energy storage density of the sample remains at 1074 kJ/kg, which is 1.86 times that of the undoped CaCO 3 . This study provides a new way to design CaCO 3 materials suitable for CSP applications.
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Toxics
·
2024
·Vol. 12
·期 3
·230
·
IF 3.9
Lingli Min,Yahui Ma,Bi Zhang,Dulan He,Jinhua Chen,Xuerong Li,Shuhua Wang,Yulang Chi
Efficient removal of extremely mobile and toxic As(III) from water is a challenging but critical task. Herein, we developed a functionalized sorbent of chitosan nanofiber with iron–manganese (Fe-Mn@CS NF) using a one-step hybrid electrospinning approach to remove trace As(III) from water. Batch adsorption studies were performed to determine the adsorption efficiency under a variety of conditions, including contact time, starting concentration of As(III), ionic strength, and the presence of competing anions. The experimental results demonstrated that the concentration of As(III) dropped from 550 to less than 1.2 µg/L when using 0.5 g/L Fe-Mn@CS NF. This demonstrates the exceptional adsorption efficiency (99.8%) of Fe-Mn@CS NF for removing As(III) at pH 6.5. The kinetic tests revealed that the adsorption equilibrium was reached in 2.6 h, indicating a quick uptake of As(III). The ionic strength effect analysis showed that the adsorbed As(III) formed inner-sphere surface complexes with Fe-Mn@CS NF. The presence of SO42−or F−had a negligible impact on As(III) uptake, while the presence of PO43−impeded As(III) absorption by competing for adsorption sites. The exhausted sorbent could be effectively regenerated with a dilute NaOH solution. Even after 10 cycles of regenerating Fe-Mn@CS NF, the adsorption efficiency of As(III) in natural groundwater was maintained over 65%. XPS and FTIR analyses show that the presence of M–OH and C–O groups on the sorbent surface is essential for removing As(III) from water. Overall, our study highlights the significant potential of Fe-Mn@CS NF for the efficient and quick elimination of As(III) from water.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ertai Zhang,Shuyan Guan,Haojun Fan,Yongxin Wang,Hui Yan,Lei Guo,Xuedong Zhai,Carlos A. Martínez Huitle,Jing Ding
Sulfite has been proven to promote advanced oxidation processes (AOPs) to achieve low-cost and efficient degradation of contaminants, serving as an alternative to persulfate. In this study, a novel composite Fe/Mn@carbon felt (CF) electrode was successfully constructed to remove carbamazepine (CBZ). The capacity of the Fe/Mn@CF anode to activate sulfite was evaluated under various electrode preparation conditions and operating parameters. Results clearly indicated that the complete removal of CBZ was achieved in Fe/Mn@CF anode activated sulfite system under the specific conditions including Na 2 SO 4 electrolyte concentration of 50 mM, sulfite dosage of 1 mM, initial pH of 7, and current density of 1 mA/cm 2 . The capacity of Fe/Mn@CF anode for sulfite activation was further presented by its excellent reusability and stability in terms of CBZ removal and metal ion release. Both radical and non-radical pathways were significantly contributed to the CBZ removal, including OH, SO 4 · - , O 2 · - , 1 O 2 , and other reasons. Density functional theory (DFT) calculations demonstrated that Fe-Mn bimetals effectively promoted sulfite activation, with the electric field further boosting the process of Fe-Mn valence cycle and oxidation. Overall, the novel Fe/Mn@CF activated sulfite system exhibited outstanding performance and had great potential for sustainable use in removing organics.
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Tungsten
·
2024
·
IF 5.6
Sun Xin-Ran,Yuan Hao-Ming,Zhang Guo-Da,Wang Chao,Sun Shu-Juan,Shi Peng-Fei
The combination of photodynamic therapy (PDT) and chemodynamic therapy (CDT) in tumor treatment has attracted considerable attention. However, tumor hypoxia and glutathione (GSH) overproduction in the tumor tissue restricted the progress of their applications. Herein, a Mn-porphyrinic metal–organic framework (Mn-TCPP) was constructed by the one-pot method and further used for immobilizing glucose oxidase (GOx) to obtain GOx@Mn-TCPP. GOx would rapidly exhaust endogenous glucose into hydrogen peroxide (H 2 O 2 ) and gluconic acid, thus shutting off the energy supply of tumor cells for starvation treatment. Mn-TCPP catalyzed H 2 O 2 to produce oxygen, regulating the hypoxic tumor microenvironment and in turn improving 1 O 2 generation under laser irradiation. Interestingly, Mn-TCPP can reduce reactive oxygen species consumption owing to the redox reaction between Mn 3+ and GSH, thus greatly enhancing PDT. Furthermore, benefiting from GOx-mediated starvation therapy, Mn 2+ produced by Mn 3+ reduction can react with sufficient intracellular H 2 O 2 to generate ·OH with high cytotoxicity through a Fenton-like reaction. After treatment by GOx@Mn-TCPP under laser irradiation in vitro, the cell viability of 4T1 and A549 tumor cells reached to 20%, reflecting GOx@Mn-TCPP could give full play to the advantages of PDT/CDT/starvation therapy. The results in vivo demonstrated that GOx@Mn-TCPP mediated synergistic cascade therapy could significantly inhibit tumor growth and improve the therapeutic effect.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ruonan Guo,Zenghui Bi,Beidou Xi,Changsheng Guo,Heng Zhang,Ningqing Lv,Guangzhi Hu,Jian Xu
The function of heterogeneous catalyst in singlet oxygen ( 1 O 2 ) generation under acidic and neutral conditions and the effect of sulfate radical on the generation of 1 O 2 is still unclear. This study provided a novel generation pathway of 1 O 2 in the heterogeneous Mn single − atom catalyst (Mn SAC)/peroxymonosulfate (PMS) system. The MnN4 site with the ideal binding strength promoted the activation of PMS to generate sulfate radical (SO 4 •– ), which would be adsorbed on the carbon/nitrogen sites forming SO 4 •– (s) , reacting spontaneously to produce 1 O 2 . The presence of MnN4 and carbon/nitrogen structure sites could shift the oxidation process from a bulk–phase oxidation to a surface oxidation. This shift has important implications in terms of reaction rate and product distribution, as the dual reaction sites decrease the required migration distance for the active species to form 1 O 2 , avoiding the pointless consumption of active substances.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ziming Wang,Fangbing Liu,Dongyu Pei,Hanbo Wang,Sheng Wan,Yan Wang,Mingrui Yu,Kechang Li,Haiyan Lu
As environmental and carbon emission issues become increasingly severe, electrochemical energy storage systems have gained attention. Compared to traditional supercapacitors, zinc-ion hybrid capacitors (ZIHCs) are not only environmentally friendly but also cost-effective. MnO 2 , with its low cost, eco-friendliness, high theoretical capacity, and stable crystal structure, is considered a promising positive electrode material. In this study, the morphology of MnO 2 was optimized using electrodeposition. During cycling, zinc ions reversibly intercalate and extract from MnO 2 , forming a cactus-like nanoflower structure. This structure is loose and porous, providing ample reaction space for active materials. The assembled device exhibits excellent performance in both energy density (85.68 Wh kg −1 ) and stability (91.60 %).
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TALANTA
·
2025
·
IF 6.1
Yin-Xia Sun,Xue Bai,Ai-Ping Luo,Yu Sun,Zhe-Peng Deng,Wan-Hong Sun,Wen-Yu Han
Quinolone antibiotics pose a threat to health and the environment due to their difficulty in decomposition and misuse. A novel fluorescence composite material CQD x @Co/Mn-MOF has been developed, which uses cobalt (Co) and manganese (Mn) as metal centers and 1,3,5-triazobenzene as organic ligands. Meaningfully, CQD x @Co/Mn-MOF can be designed as a ratiometric fluorescence sensor for detecting quinolone antibiotics, especially norfloxacin (NFX). In a series of CQD x @Co/Mn-MOF, CQD 6μL @Co/Mn-MOF sensor exhibits good linearity within the NFX concentration range of 1–4 × 10 −5 M, with a detection limit of 0.70 μM. Compared with Co/Mn-MOF, introducing CQDs significantly reduces the detection limit from 3.50 μM to 0.70 μM and increases the detection sensitivity by five times. The CQD 6μL @Co/Mn-MOF sensor exhibits fast response time (2 s), high selectivity and sensitivity to NFX, making it an ideal ratiometric fluorescent sensor for the detection of these antibiotics. Based on its excellent detection performance, the sensor was further applied to the quantitative determination of NFX in chicken, beef and honey samples and satisfactory results were obtained with recoveries ranging from 97.51 % to 108.60 %. In addition, based on CQD 6μL @Co/Mn-MOF test strips, convenient and real-time detection of quinolone antibiotics has been achieved. In conclusion, the CQD 6μL @Co/Mn-MOF ratiometric fluorescent sensor provides a reliable, sensitive and efficient analytical method for the detection and evaluation of trace NFX in food, which is of great significance for ensuring food safety and public health.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Peng Zhao,Jingwei Liu,Wei Zhu,Jie Meng,Zhuang Li,Jinwei Qin,Xiaohui Wang,Haiqin Wan,Chao Yao,Lin Dong
Catalytic combustion is one of effective ways to remove short-chain alkanes. In this study, we elaborately designed a novel catalyst of in situ Co-Mn decorated LaMnO 3 perovskite for ethane catalytic combustion, in which extra Mn and Co species were introduced via acidic KMnO 4 and Co(NO 3 ) 2 solution precipitation method. The addition of Mn and Co could not only slightly etch LaMnO 3 , thereby increasing specific surface area and redox property, but also generate new active phase CoMn 2 O 4 , thus accelerating reaction. Among all the as-prepared catalysts, CMO/LMO-0.5 exhibited admirable ethane removal efficiency with a T 90 of 365 °C, a reaction rate of 0.46 mmol·g −1 ·h −1 , a TOF value of 0.64 mmol·g −1 ·h −1 , and excellent hydrothermal stability and reusability. Moreover, according to in situ DRIFTS, a possible pathway was proposed. This work can rationalize an alternative approach to develop an active catalyst for short-chain alkanes catalytic combustion or other catalytic systems.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Tian Tian,Peixin Zhu,Chun He,Ya Xiong,Jingyun Fang,Shuanghong Tian
As initial and important reactive species, surface O 3 complexes are rarely investigated in catalytic ozonation, which might be one cause of dispute in mechanistic understanding. Herein, In-situ DRIFTS and premixing-standing experiments confirmed the generation of long-lived Mn-O 3 * complexes upon O 3 adsorption on surface Lewis acid sites of α-MnO 2 . In α-MnO 2 /O 3 system, the oxidation rate of various pollutants showed a good linear correlation with their redox potentials, as well as the energy gap between the pollutants and Mn-O 3 * complexes. Joint catalytic mechanism experiments and density functional theory calculations revealed that the oxidation of pollutants was boosted mainly because there was fast nonradical intermolecular electron transfer from the HOMO of pollutants to the LUMO of Mn-O 3 * complexes. This study illustrates the significance of surface Mn-O 3 * complex in catalytic ozonation and discloses an efficient nonradical catalytic ozonation process that is resistant to pH fluctuation and matrix interference.
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Materials
·
2025
·Vol. 18
·期 15
·3633
·
IF 3.2
Hengfen Shen,Hao Du,Peng Li,Mei Wang
As an efficient clean energy technology, water electrolysis for hydrogen production has its efficiency limited by the sluggish oxygen evolution reaction (OER) kinetics, which drives the demand for the development of high-performance anode OER catalysts. This work constructs bimetallic (Al, Mn) co-doped nanoporous spinel CoFe 2 O 4 (np-CFO) with a tunable structure and composition as an OER catalyst through a simple two-step dealloying strategy. The as-formed np-CFO (Al and Mn) features a hierarchical flaky configuration; that is, there are a large number of fine nanosheets attached to the surface of a regular micron-sized flake, which not only increases the number of active sites but also enhances mass transport efficiency. Consequently, the optimized catalyst exhibits a low OER overpotential of only 320 mV at a current density of 10 mA cm −2 , a minimal Tafel slope of 45.09 mV dec −1 , and exceptional durability. Even under industrial conditions (6 M KOH, 60 °C), it only needs 1.83 V to achieve a current density of 500 mA cm −2 and can maintain good stability for approximately 100 h at this high current density. Theoretical simulations indicate that Al and Mn co-doping could indeed optimize the electronic structure of CFO and thus decrease the energy barrier of OER to 1.35 eV. This work offers a practical approach towards synthesizing efficient and stable OER catalysts.
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Journal of Energy Storage
·
2025
·
IF 9.8
Yongxiang Yuan,Jianglong Kang,Shengping Jin,Dengdeng Ai,Wenying Zhao,Jiatai Wang,Yulong Kang,Xiaoyi Hou
P2-type layered Mn-based excess metal oxide cathode is considered to be one of the most promising cathode materials for sodium-ion batteries (SIBs) due to the open sodium ion diffusion channels and low diffusion energy barrier. However, the deep charge/discharge process of the P2-type layered oxide cathodes at high potential leads to the displacement and irreversible alterations of the crystal structure, thereby resulting in poor rate capability and deteriorated capacity retention. The charge/discharge curves are smoothed after Fe doping. The specific discharge capacity, rate capability and cycling stability of the samples are significantly improved by Fe-doping. When x = 0.03, the obtained Na 0.6 Mn 1-x Fe x O 2 cathode delivers excellent electrochemical performance. The initial discharge specific capacity of the cathode is 193.14 mAh g −1 at 0.1C, and can remain 91.05 mAh g −1 after 100 cycles. The capacity retention rate is as high as 86.02 % when the current density turn back to 0.1C after cycles at different current densities. The present work may propose a strategy to improve P2-type layered Mn-based cathode materials for sodium-ion batteries by a doping method, which will be of great significance for the commercialization of sodium-ion batteries.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·42567
·
IF 3.9
Chen Dejun,Feng Jiawei,Guan Qingqing,Zhao Mengqi,Yuan Hao,Liang Xiaoyang
This study successfully developed Cu-Mn supported catalysts on fly ash geopolymer for the oxidative removal of toluene. The surface characteristics and catalytic performance of catalysts were systematically investigated in this paper. It was found that the Cu/Mn ratio plays a crucial role in determining the catalysts’ performance, with the Geo-3 catalyst showing the highest toluene conversion rate of 90% at 296 ℃. The catalyst also exhibited the lowest activation energy of 123.0 kJ/mol, indicating its superior catalytic efficiency. The findings not only contribute to the development of cost-effective and efficient catalysts for VOCs degradation but also provide valuable insights into the influence of the Cu/Mn ratio on the catalytic properties of geopolymer-supported Cu-Mn catalysts. This research offers a promising approach for the abatement of VOCs in industrial emissions.
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