Frontiers in Energy Research
·
2022
·
IF 3.858
Zhang Shuai,Ren Huixue,Fu Kaifang,Cheng Wenqing,Wu Daoji,Luo Congwei,Jiang Shengyun,Li Jie,Zhang Mingyue
The printing and dyeing wastewater produced by different dyes, as well as different printing and dyeing processes, have different components. These wastewater have high toxicity, high organic concentration, and deep chromaticity. Ozone catalytic oxidation is a very promising technical method for wastewater treatment. In this paper, Mn/Mg/Ce ternary catalyst was prepared, and the ozone catalytic oxidation treatment of actual and simulated printing and dyeing wastewater was performed to study the performance of four different carrier catalysts, namely, molecular sieve (MS), silica gel (SG), attapulgite (ATP), and nano alumina (Al2O3), by simulated dynamic test. The effects of reaction time, pH, and catalyst dosage on methyl orange degradation were studied. The results showed that under the optimum treatment conditions (120 min, pH 11, and 12.5 g/L catalyst dosage), the degradation rate of methyl orange reached 96% and the removal rate of the chemical oxygen demand of printing and dyeing wastewater reached 48.7%. This study shows that the treatment effect of ozone catalytic oxidation on printing and dyeing wastewater is remarkably improved after catalyst addition. This study provides a new choice of ozone catalyst for the degradation of printing and dyeing wastewaters in the future.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 1
·1289-1300
·
IF 4.223
Huang Tao,Du Jing,Yu Danni,Deng Shihan,Zhang Shuwen,Liu Longfei
Aqueous Fe(II)-catalyzed activation commonly deteriorates the oxidation performance of persulfate (PS) to the treatment of organic contaminants. In this study, a PS-doped layered bimetallic hydroxide (Fe–Mn hydroxide) was synthesized to construct a heterogeneously catalytic system to solve the issue brought by homogeneity. The molar ratio of Fe(II) to Mn(II) and the mass ratio of PS to Fe–Mn hydroxide both had a significant impact on the catalytic degradation of p-CP. Reaction temperatures engaged in the most essential role in influencing the degradation and removal of p-chlorophenol (p-CP). The optimal combination of factors for the preparation of PS-hydroxide and the treatment of p-CP was finally determined by significance analysis. The degradation process was appropriately fitted by the pseudo-first-order kinetic model. The benzene ring in p-CP was broken by PS-hydroxide during the adsorption. The surface modification of PS-hydroxide caused by the valence transition of Mn was beneficial to the adsorption and catalytic degradation of p-CP.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zilei Liu,Feng Li,Gaoxiang Huang,Feng Zhao,Weiwei Zhang,Guangyu Jiang,Sunhuizi Cheng,Zixin Fang,Quanshui Zhu,Yan Huang
Perovskite quantum dots (PQDs) suffer from the long-time stability owing to their strong ionic structure. Wrapping them with silica or doping them with ions have been used to improve their structural stabilities. Here, transitional metal doping and surface engineering are employed to synthesize silica-coated Mn:CsPbCl 3 QDs for the fabrication of photoluminescent QD-based light-emitting diodes (QLEDs). The as synthesized QDs have dual emission, one is the intrinsic emission of the perovskite host, and the other is the Mn-related emission. The as synthesized Mn-doped CsPbCl 3 exhibit improved stability of luminous spectra compared to those of the pure ones. We also integrate the silica-coated Mn:CsPbCl 3 QDs as color converters with a purple chip. The luminous spectra of the photoluminescent QD-based light-emitting diodes (QLEDs) can be adjusted by controlling the QD concentration. Twenty-day observation and measurement show that devices based on the silica-coated Mn:CsPbCl 3 exhibit enhanced performance stabilities, including a maximum CRI fluctuation of 2.3, a maximum CCT fluctuation of 7 K and a maximum LER fluctuation of 5.2 lm/W opt . These results indicate that manganese doping and silica shell are helpful for the stability improvement of perovskite QDs, and the potential applications of silica-coated Mn:CsPbCl 3 QDs in lighting fields.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·Vol. 28
·期 8
·2547-2560
·
IF 2.6
Wan Huan,Wang Wei,Bu Lu-xia
In this study, Al-Fe and Al-Fe-Mn alloy anodes are prepared and examined. The influence of impurity Fe on the microstructure and properties of Al alloy anodes is investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), and electrochemical testing techniques. The results reveal that the presence of impurity Fe in Al alloys significantly shifts the open-circuit potential of the Al anode towards the positive side and reduces its discharge efficiency. However, the adverse impact of impurity Fe is mitigated by alloying with Mn. Specifically, the open-circuit potential of Al-0.20%Fe-0.20%Mn anodes is observed to shift negatively by 70 mV when compared to that of Al-0.20%Fe in a 3 M KOH solution. Furthermore, the anode utilization of Al-0.20%Fe-0.20%Mn anodes, following continuous discharge at 30 mA·cm −2 and 100 mA·cm −2 for 30 min, is found to be 70% and 52% higher, respectively, than that of Al-0.20%Fe anodes. This highlights the effectiveness of Mn modification as a preferable approach to ameliorate the detrimental effects of impurity Fe.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Hongchao Li,Na Yuan,Jieshu Qian,Bingcai Pan
The environmentally benign Mn oxides play a crucial role in the transformation of organic contaminants, either through catalytically decomposing oxidants, e.g., peroxymonosulfate (PMS), or through directly oxidizing the target pollutants. Because of their dual roles and the complex surface chemical reactions, the mechanism involved in Mn oxide-catalyzed PMS activation processes remains obscure. Here, we clearly elucidate the mechanism involved in the Mn2O3 catalyzed PMS activation process by means of separating the PMS activation and the pollutant oxidation process. Mn2O3 acts as a shuttle that mediates the electron transfer from organic substrates to PMS, accompanied by the redox cycle of surface Mn(IV)/Mn(III). Multiple experimental results indicate that PMS is bound to the surface of Mn2O3 to form an inner-sphere complex, which then decomposes to form long-lived surface reactive Mn(IV) species, without the generation of sulfate radicals (SO4•–) and hydroxyl radicals (HO•). The surface reactive Mn(IV) species are proposed to be responsible for the degradation of organic contaminants (e.g., phenol) and the formation of singlet oxygen (1O2), followed by the regeneration of the surface Mn(III) sites on Mn2O3. This study advances the fundamental understanding of the underlying mechanism involved in transition metal oxide-catalyzed PMS activation processes.
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Water Cycle
·
2024
·
IF 0
Guoting Li,Haozhe Li,Shude Zhang,Xiao Mi,Yujie Guo,Zhixin Song,Yuhao Liu,Hongwei Pan,Baogui Wang,Yingxu Liu,Weigao Zhao,Tannaz Pak
Mn oxides are confined within the porous structure of activated coke (ACO) via impregnation followed by calcination treatment. The Mn-ACO sample calcined at 600°C (Mn-ACO600) demonstrated superior performance despite containing only a minute atomic ratio of 0.11% Mn on its surface. This treatment led to a slight increase in the specific surface area and pore volume of ACO, with a significant enhancement in the proportion of micropores, rising from 54.2% in ACO to 71.8% in Mn-ACO600. Raman spectroscopy indicated additional defects in Mn-ACO, while XPS analysis confirmed the coexistence of Mn(II), Mn(III), and Mn(IV) oxides. Although ACO adsorption alone was ineffective in removing acesulfame (ACE), Mn-ACO600 achieved a removal rate of 19.0%. The introduction of peroxydisulfate (PDS) further boosted the degradation of Mn-ACO600, with a K app value that was 2.28 times of that of the combined Mn-ACO600 adsorption and PDS oxidation process, indicating a remarkable synergistic effect. To optimize the experimental conditions, a response surface methodology design analysis was conducted, revealing that solution pH and the dosage of Mn-ACO600 were crucial factors. Furthermore, the study confirmed non-radical oxidizing species, such as 1 O 2 and h + , played a predominant role in the process, with relatively minor contributions from radical oxidizing species.
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Journal of Energy Storage
·
2025
·
IF 9.8
Zhiwen Wang,Zhenping Qiu,Chaojie Zhao,Zheng Pan,Guangxia Wang,Yue Guo
As demand for high-energy-density batteries grows, cobalt-free ultra-high‑nickel cathodes like LiNiO₂ are poised to revolutionize next-generation energy storage solutions. However, their practical use is hindered by structural degradation caused by phase transitions, oxygen loss, and detrimental interfacial reactions triggered by the strong oxidizing nature of Ni 4+ formed under high voltage, which together lead to rapid capacity degradation and poor cycling stability. To overcome these challenges, effective doping strategies are crucial. This study systematically examines the potential of Mn and Al doping to enhance the stability of LiNiO₂ using in situ XRD, TEM, XPS, and electrochemical testing. The results show that, while both Mn and Al doping enhance structural stability and cycling performance, they operate through different mechanisms. In particular, 4 mol% Al doping remarkably suppresses c-axis expansion, enhances phase transition reversibility, and achieves capacity retention of 84.8 % after 100 cycles at 1C. In contrast, LiNiO₂ exhibits good tolerance toward Mn doping up to 10 mol%, which helps mitigate structural degradation; however, the capacity retention remains moderate at 80.3 %. While Al doping primarily enhances electrochemical performance, Mn doping contributes to preserving the structural integrity of the cathode at higher concentrations. Our study reveals their complementary roles, providing a strategy to address structural challenges and advance sustainable cobalt-free energy storage solutions.
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高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Tingting Tang,Yanfang Teng,Kuoteng Sun,Yanhan Liu,Zhendong Gao,Tayirjan Taylor Isimjan,Jingya Guo,Jianniao Tian,Xiulin Yang
Crystalline and amorphous catalysts offer disparate advantages in reducing the overpotential of the oxygen evolution reaction (OER). Crystalline phases provide excellent electrical conductivity, while amorphous phases offer abundant unsaturated active sites. This study explores a synergistic strategy that integrates these benefits to develop high-performance OER catalysts with enhanced activity and stability. By employing controlled annealing followed by phosphating, we engineered a transition from low-crystallinity MnP–Co3P/NF to high-crystallinity MnP–Co3(PO4)2/NF, effectively tuning the balance between conductivity and active site availability. Advanced spectroscopic characterization studies (including X-ray photoelectron spectroscopy (XPS), zeta potential analysis, ultraviolet photoelectron spectroscopy (UPS) and electrochemical measurements) reveal that the high-crystallinity MnP–Co3(PO4)2/NF catalyst exhibits superior hydrophilicity, an enriched concentration of phosphorus vacancies, and enhanced charge redistribution, collectively leading to significantly improved OER kinetics. The catalyst achieved low overpotentials of 281 mV at 50 mA cm−2 and 306 mV at 100 mA cm−2, with exceptional stability for 230 h at 100 mA cm−2, outperforming comparable systems and commercial noble metal catalysts. In situ studies revealed faster formation of the active CoOOH phase on high-crystallinity MnP–Co3(PO4)2/NF. This work provides valuable insights into designing efficient and durable OER catalysts for energy conversion applications.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2025
·Vol. 23
·期 1
·1-18
·
IF 12.6
Wen E.,Tian Yu,Chen Yu,Wang Zhigang,Feng Yi,Liao Zhen
Despite the encouraging developments in tumor immunotherapy, the complex tumor microenvironment (TME) and abnormal energy metabolism persist as key factors facilitating immune escape. Recent research has emphasized the significant potential of the Manganese ions (Mn 2+ ) as a “immune ion reactors” have the potential to stimulate cGAS-STING signaling pathway in modulating tumor immunotherapy. However, their efficacy is limited by insufficient targeting and lack of tumor specificity. To address these challenges, we have developed a nano-drug named as LT@MnO@MON-HA (LMMH), which incorporates manganese oxide (MnO) nanoparticles as the core and organic mesoporous silica as the outer layer. The mitochondrial glycolysis inhibitor lonidamine (LT) is encapsulated within the mesopores of LMMH and subsequently coated with hyaluronic acid to achieve precise tumor-targeted drug delivery. After reaching the tumor site, LMMH can decompose in the reducing and acidic TME, releasing LT and Mn 2+ . Once internalized by cells, LT rapidly localizes to mitochondria via functional groups, disrupting mitochondrial metabolism and increasing intracellular reactive oxygen species levels. Mn 2+ catalyze the conversion of hydrogen peroxide (H₂O₂) into more cytotoxic hydroxyl radicals (·OH), thereby enhancing chemodynamic therapy (CDT). The mesoporous silica shell of LMMH is capable of depleting glutathione in the TME, enhancing CDT. Moreover, LMMH functions as an agonist of the cGAS-STING pathway, stimulating cytokine release and activating effector T cells, which in turn triggering systemic immune responses against primary and metastatic cancers. Collectively, these finding highlights the dual mechanisms by which LMMH enhances combination immunotherapy by regulating the TME and tumor metabolism. Graphical
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PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Hu Lan,Zhao Qiuyue,Zhang Xinling,Li Huipeng,Bian Cheng,Zeng Yiqing
Redox sites and acidic sites are the main active sites of bimetallic oxide catalysts used for selective catalytic oxidation of NH 3 (NH 3 -SCO). In this work, three MMoO x (M = Cr, Fe, and Mn) bimetallic oxides catalysts were prepared by simple grinding and calcination to investigate the effect of redox sites (M sites) on the NH 3 -SCO performance. The NH 3 -SCO test results showed that the activity of MMoO x is in the order of CrMoO x > MnMoO x > FeMoO x . The characterization results of H 2 -TPR, O 2 -TPD, NH 3 -TPD, and in situ DRIFTS proposed that the NH 3 -SCO reaction on MMoO x catalysts is proceed via i-SCR mechanism, and the formation of the intermediates of NH 3 -SCR reaction is the decisive reaction step. Owing to the excellent ability in promoting the formation of nitrate/nitrite species, CrMoO x and MnMoO x samples show much higher NH 3 -SCO activity than FeMoO x sample . CrMoO x can facilitate the formation of a large amount of –NH 2 species, which together with nitrate/nitrite species enhance the NH 3 -SCO reaction via i-SCR reaction route. Therefore, CrMoO x shows the highest NH 3 -SCO activity among the MMoO x catalysts. Through this work, the redox sites of bimetallic oxide catalysts are demonstrated as a vital role in inducing the formation of reaction-active intermediates, which highlight the importance of choosing the redox sites in designing NH 3 -SCO catalyst.
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高影响因子
POLYHEDRON
·
2024
·
IF 2.4
Wei Sun,Xue-Lu Hao,Wen-Qian Zhang,Zhen-Nan Li,Dong-Fang Zhang,Li Xu,Yi-Fan Kang
N -Oxide-functional isonicotinic acid N -Oxide (HINO) ligand has been selected to construct functional metal–organic frameworks (MOFs). And based on HINO ligand and Mn(Ⅱ) center, a novel N -Oxide-functional three-dimensional (3D) pillared microporous Mn(Ⅱ)-MOF, [Mn(INO) 2 ·CH 3 OH] n ( 1 ), has been constructed. MOF 1 has been characterized by single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), thermogravimetric analyses (TGA), elemental analyses (EA) and infrared spectroscopy (IR). Structural analysis reveal that in MOF 1 , the N -Oxide group and carboxylic group of INO ligand connect Mn(Ⅱ) centers to form a one-dimensional (1D) Mn-O chain, and then the 1D chains are supported by INO ligands with two types of coordination modes to generate its 3D pillared microporous framework. Given the 1D Mn-O chains in MOF 1 , magnetic susceptibility measurements have been conducted, which show antiferromagnetic exchange interactions between Mn(Ⅱ) centers in the Mn-O chain. Given the porosity of MOF 1 and the N -Oxide sites and vacant carboxylic O sites on its pore surfaces, gas adsorption experiments of MOF 1 have been investigated by N 2 , CH 4 and CO 2 gases. MOF 1 displays good adsorption capacity, affinity and selectivity of CO 2 over CH 4 and N 2 , indicating its potential application in postcombustion CO 2 capture and gas separation.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Simin Li,Ziran Chang,Fengbing Tang,Tianshuo Sui,Lemin Li,Jingbo Mu,Zhennan Shi
The QS@PDA/Co-Mn-ZIF catalyst, synthesized using quartz sand as a base material, effectively degrades TCH through the activation of PMS. The Co-Mn-ZIF component activates PMS, while PDA ensures the adhesion of ZIF to quartz, facilitating catalyst recovery. This design enhances electron transport and metal ion redox reactions, generating reactive species that degrade TCH. It achieves a 94 % TCH removal rate from a 100 mg/L solution within 40 min, demonstrating stability under various pH and water conditions. The catalytic mechanism was elucidated·through radical trapping experiments and electron paramagnetic resonance analysis. QS@PDA/Co-Mn-ZIF shows great potential for treating recalcitrant and high-concentration organic wastewater.
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高影响因子
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