CHEMOSPHERE
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2021
·
IF 7.086
Ziyi Guo,Yuan Zhang,Dong Wang
A non-radical catalytic ozonation process functionalized by Mn(II)-sites was found effective to degrade oxalic acid as a typical refractory compound that is hard to remove through catalytic ozonation with hydroxyl radical oxidation. Specifically, we prepared functional Mn–C@Fe nanoparticles with carbon shell supporting Mn 3 O 4 for catalysis while encapsulating magnetic iron core for recycle. Batch study shows its excellent catalytic reactivity on the degradation of organics particular for the ozone-recalcitrant oxalic acid (20 min for 90.9% removal, kinetics constant of 0.045 min −1 ). Our mechanism study ruled out the hydroxyl radical oxidation, and highlighted the formation of a heptavalent Mn intermediate oxidant responsible for the fast degradation that was initiated via ozone activation of Mn(II)-sites on the carbon shell. Our findings underscore a non-radical catalytic ozonation as a promising alternative technology for the abatement of aqueous organic pollutants.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 10
·14720-14731
·
IF 5.164
Yang Zhan,Qing Wang,Shao-Hua Luo,Si Li,Luo-Xuan Wang,Xin Liu,Ya-Hui Zhang,Long-Jiao Chang
Summary The lithium transition metal orthosilicates (Li 2 MnSiO 4 ) compounds are considered key materials for the next-generation lithium-ion batteries (LIBs). However, they exhibit poor electronic conductivity and structural stability. Herein, the dual-phase ( Pmn2 1 , and Pn ) coexisting Li 2 Mn 1− x Ni x SiO 4 @C is prepared successfully via a two-step calcination process to address the aforementioned problems. The orthorhombic Pmn2 1 and Pn phase are expected to bring well solid-state Li diffusion properties (D Li + ) and structural stability for electrode material, respectively. Also, the Ni doping and carbon coating are expected to raise electronic conductivity. Then, the electrochemical performance of LIBs utilizing LiMn 0.995 Ni 0.005 SiO 4 @C, LiMn 0.985 Ni 0.015 SiO 4 @C, and LiMn 0.92 Ni 0.08 SiO 4 @C (ZNi-02 to ZNi-04) as cathode materials are investigated and compared with that of the LiB using Li 2 MnSiO 4 @C (ZNi-01). The ZNi-04 sample-based LiB shows well D Li + and a peak discharge capacity as high as 188.4 mAh g −1 . In addition, the ZNi-04 sample can still maintain a capacity of about 80 mAh g −1 at rate of 8 C. Such excellent electrochemical performance is ascribed to the synergistic effect of the dual-phase coexistence, the proper amount of Ni doping, and surface coating of carbon, which enhances the electrical conductivity and structural stability. Thus, Li 2 Mn 1− x Ni x SiO 4 @C has broad application chances as a high-performance LIBs electrode material.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chenhui Hu,Chunhong Liu,Kaimin Du,Chengkai Pang,Zuoxi Zhuo,Qiangsheng Gao
An energy-saving catalyst 4%Fe/Ce-Mn-TiO 2 was prepared via a simple one-step impregnation-annealing process and used as a denitration catalyst at low temperature (≤180 °C) and high water content (∼20%). The results show that 4%Fe/Ce-Mn-TiO 2 catalyst exhibits good low-temperature catalytic activity and water resistance attributed to its highly dispersed metal oxide species, more surface-adsorbed oxygen and high stability of particles. The denitrification efficiencies of 4%Fe/Ce-Mn-TiO 2 catalyst are 90% (5% H 2 O) and 70% (20% H 2 O) at 170 ℃ respectively, which are superior to the commercial vanadium catalyst in service usually needs heating up to 220 ℃.
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POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Yingbing Zou,Kui Niu,Fubin Luo,Hongzhou Li
The development of metal oxide flame retardants that are easy to synthesize, efficient, and recyclable would be more beneficial to circular economy. In this work, a porous core-shell Mn 3 CoO x was developed to efficiently reduce heat, smoke as well as hazardous gas during the combustion of epoxy resin (EP). Compared with pure EP, the peak heat release rate (pHRR), total heat release (THR), peak smoke production rate (pSPR), total smoke production (TSP), peak CO production rate (pCOPR), and peak CO 2 production rate (pCO 2 PR) of EP/Mn 3 CoO x are reduced by 47.5 %, 21.5 %, 34.6 %, 17.6 %, 58.6 %, and 55.4 %, respectively. It has been shown that Mn 3 CoO x not only catalyzes the formation of high-quality char layer but also effectively catalyzes the conversion of hazardous gas products into CO 2 . Recovery experiments of Mn 3 CoO x filler in EP composites show that the recovery of Mn 3 CoO x can reach 90.0 %. This work provides insights into the design of efficient metal oxide flame retardants and ideas for the development of recycled flame retardants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Tingting Zhu,Xin Song,Tianle Li,Junpeng Hu,Kai Qi,Panting Gao,Rongji Cui,Zhicheng Tang
The biological fermentation industry faces a challenge in simultaneously purifying complex sulfur-containing volatile organic compounds (VOCs) and reducing tail gas emissions. This is due to the multi-step purification process required for sulfur-containing VOCs and the high energy usage involved. The adsorption performance and controllability of elements in hydrotalcite-like compounds are noteworthy and have the potential to enhance the catalytic purification of sulfur-containing VOCs. This study utilizes Mn-based hydrotalcite-like compounds as a highly efficient catalyst for the simultaneous catalytic removal of complex sulfur-containing VOCs such as ethanol (C 2 H 5 OH), acetaldehyde (CH 3 CHO), and diethyl sulfide (C 4 H 10 S). The study successfully achieves the simultaneous and efficient removal of sulfur-containing VOCs at a temperature of 325 °C. The removal rates of three types of gas pollutants can reach 100 % for 420 min, 450 min, and 360 min, respectively. Meanwhile, the VOCs breakthrough capacity is 426 mg/g. The competitive adsorption effect, adsorption sites, and reaction mechanism were investigated using experimental and theoretical calculation methods. The simultaneous adsorption of three gases resulted in competitive adsorption, with the priority order of adsorption being CH 3 CHO > C 4 H 10 S > C 2 H 5 OH. The various adsorption effects were attributed to the formation of Mg–O–H…O-C, O…O=C, and Mn–O–H…S-C, respectively. CH 3 CHO was initially adsorbed at the O-Top site, while C 4 H 10 S was adsorbed at the Mn-Top site. C 2 H 5 OH was adsorbed at the Mg-Top site. High-temperatures promote the oxidation of elemental S to sulfate. The primary reason for catalyst deactivation is the buildup and coating of sulfate on the surface of the catalyst. The main active sites responsible for the catalytic oxidation of C 4 H 10 S were Mn 2+ and Mn 3+ . The oxygen defects act as active sites for the oxidation of C 2 H 5 OH and CH 3 CHO. C 2 H 5 OH undergoes gradual oxidation to form CH 3 CHO and CH 3 COOH (acetic acid), which are further oxidized to CO 2 and H 2 O. C 4 H 10 S was oxidized to elemental S and eventually to sulfate. The experimental results in this work are consistent with the theoretical results, providing a theoretical basis for the simultaneous catalytic removal of sulfur-containing VOCs.
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Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Sidan Wang,Pei Wang,Guojun Zhou,Nan Zhang,Yilin Mao,Xian-Ming Zhang
Low-dimensional chiral metal halides (CMHs) are promising as an industrialized platform for chiral recognition applications; however, there are hardly any luminescent CMHs with variable energy transfer between an organic ligand and an inorganic unit. Herein, an array of rare one-dimensional (1D) luminescent CMHs were engineered by screening R/S-3-aminopiperidine dihydrochloride as a chiral template, in which the chirality of the organic cation is transferred to the inorganic chain via hydrogen bonding interactions in (R/S-C5H14N2)MCl4·H2O (M = Mn, Cd), abbreviated as R/S-Mn and R/S-Cd. The orange emission at 607 nm is attributed to the d–d transition 4T1(G)–6A1(S) of Mn2+ in R/S-Mn, along with an energy transfer from the organic cation to the inorganic chain. In contrast, a reverse energy transfer from the inorganic chain to the organic cation was verified in R/S-Cd, with the emission at 401 nm being attributed to the singlet self-trapped excitons (STEs) of Cd2+. Beyond that, we innovatively proposed that the fluorescence quenching behaviour contributes to the strong stereo-selective fluorescence responsivity for mandelic acid (MA), confirming that R/S-Mn and R/S-Cd are useful for the rapid recognition of R/S-MA. This research not only promotes the discovery of low-dimensional luminescent CMHs but also expands their applications in bio-detection and sensing.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Menglong Liu,Litao Chen,Jinyang Li,Jiayan Gao,Xue Gao
The excessive use of ofloxacin (OFL) leads to residues in animal-derived foods and poses a threat to human health. Therefore, it is crucial to design a sensitive and reliable detection platform for ofloxacin. In this study, we established a multi-mode sensing platform based on manganese and cerium-doped oxidase-like active carbon dots (Mn, Ce-CDs) for the detection of OFL. The yellow fluorescent substance 2,3-diaminophenothiazine (DAP), produced by the oxidation of o-phenylenediamine (OPD), is used as a colorimetric signal while quenching the fluorescence of Mn, Ce-CDs via fluorescence resonance energy transfer (FRET). Furthermore, the OPD polymer nanoparticles formed by DAP self-aggregation also have excellent photothermal effect. The developed colorimetric/fluorescence/photothermal multi-mode biosensor showed a wide detection range (10 −7 -10 −2 mg/mL) and low detection limit (colorimetric: 2.55 ×10 −9 mg/mL, ratiometric fluorescence: 19.1 ×10 −9 mg/mL, photothermal: 58.6 ×10 −9 mg/mL) in the quantitative detection of OFL. It could be applied to the detection of actual samples with satisfactory results.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2014
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IF 2.063
Jianrong Li,Jinsheng Chen,Yanke Yu,Chi He
The Fe–Mn–Ce/CP catalyst prepared by the incipient-wetness impregnation method was investigated for elemental mercury (Hg 0 ) removal in simulated coal-fired flue gas . The incorporation of Fe could remarkably enhance the SO 2 -resistance of Fe–Mn–Ce/CP catalyst at low temperature, and the existence of water vapor had negative impact on Hg 0 removal efficiency. More than 95% of Hg 0 could be removed at 100 °C under the conditions of 60 ppm HCl, 3% O 2 ( v/v ), 5% H 2 O ( v/v ) and 400 ppm SO 2 . Hg-TPD results indicated that Hg 0 adsorption amount decreased after the addition of H 2 O or SO 2 . The XPS results revealed that the incorporation of Fe could enhance the contents of high valence Mn x + (i.e., Mn 3+ /Mn 4+ ) and Ce 3+ species in the composite catalysts, which are favorable for the oxidation process of elemental mercury. The surface characteristics were not the primary factor determining the catalytic activity . Overall, the catalytic performance of the Fe–Mn–Ce/CP catalyst was closely related to the Fe 3+ state, high ratios of (Mn 4+ + Mn 3+ )/Mn 2+ and high content of not fully coordinated cerium species.
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TRIBOLOGY INTERNATIONAL
·
2021
·
IF 4.872
Wenlong Wang,Qingjian Liu,Daquan Li,Lei Jin,Huaping Xiao
To better understand the properties of Mn-23Cu-6Ni alloy, its tribological behavior and wear mechanism were investigated under various conditions, including dry sliding, polyalphaolefin (PAO) lubrication , and PAO lubrication with molybdenum disulfide (MoS 2 ) additive. The experimental results showed high friction and severe wear when exposed to dry sliding while the running-in process denoted contact under PAO lubrication. MoS 2 nanosheets improved the friction reduction and anti-wear performance of PAO and suppressed the running-in process, rendering the sliding system stable from the beginning. The wear mechanism of the Mn-23Cu-6Ni alloy changed from adhesive wear in dry conditions to abrasive wear when exposed to PAO lubrication with MoS 2 nanosheets .
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ENERGY & FUELS
·
2026
·Vol. 40
·期 34
·19184-19193
·
IF 6
Ma Yuhao,Zhang Lei,Jiang Minkang,Qing Shihong,Liu Hongyu,Wang Hao,Wang Liping
Lithium-rich manganese-based (LRM) cathode materials
have attracted
considerable attention for next-generation lithium-ion batteries owing
to their superior energy density. However, their cycling stability
in conventional electrolytes is severely challenged by the high operating
voltage (4.8 V vs. Li/Li + ), particularly under fast-charging
and low-temperature conditions. To overcome this mismatch, we construct
a steric hindrance-guided electrolyte design strategy to tune the
solvation structure. By systematically increasing the steric hindrance
of carboxylic ester solvents, ethyl trimethyl acetate is ultimately
identified to effectively weaken the Li + -solvent interactions.
The resulting anion-involved structure enhances Li + transport
kinetics while inducing a stable cathode-electrolyte interphase. With
this steric hindrance-induced low-temperature electrolyte, the LRM
cathode delivers exceptional fast-charging durability (1500 cycles
at 3C, RT) and an extended low-temperature cycle life (1000 cycles
at −20 ° C, 0.33C). This work validates molecular-level
steric hindrance tuning as an effective strategy to unlock the extreme-condition
performance of high-energy-density LRM cathodes.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Peixin Zhu,Yi Lu,Mengyao Xiao,Siyang Li,Chun He,Shuanghong Tian
Active MnO x location (inside MCM-41 pores vs. external surface) was precisely regulated. • Remarkable ozone oversolubility phenomenon within nanoconfined water was discovered. • Nanoconfinement effect triggered intrinsic inversion of reaction mechanism. • MnO x /C/MCM-41 nanoreactors perform excellently for complex wastewater treatment. Catalytic ozonation is promising for emerging contaminants (ECs) abatement but hindered by intrinsic bottlenecks: low O 3 solubility and catalytic efficiency. Herein, a series of xMn/C/M41 nanoreactors were fabricated via a two-step ligand-adsorption and metal-anchoring strategy. After pyrolysis, the optimized 3.3Mn/C/M41 nanoreactors confined ultra-small (~2 nm) mixed-valent MnO x nanoclusters and carbon within the mesopores of MCM-41, while s-3.3Mn/C/M41 (simultaneous ligand-metal complex adsorption) has 5–10 nm Mn 3 O 4 nanoparticles on the surface. 3.3Mn/C/M41 showed a 6.1 × 10 −2 min −1 sulfamethoxazole reaction rate (1.9 times that of s-3.3Mn/C/M41), > 93% removal of three other ECs, along with robust pH adaptability (3.5–10.5), matrix resistance and cycling stability. The excellent performance stems from the mesoporous confinement effects: 300-fold ozone oversolubility, rapid contaminant enrichment, and highly active MnO x nanoclusters with numerous undercoordinated Mn, oxygen vacancies, and Mn N motifs. Experimental and theoretical calculations demonstrate that the catalytic mechanism transforms from a hydroxyl radical (for s-3.3Mn/C/M41) to non-radical of electron transfer and 1 O 2 . This work provides a novel strategy to address the intrinsic bottlenecks of catalytic ozonation, and offers a promising platform for efficient remediation of emerging contaminants in complex aquatic environments. Download: Download high-res image (166KB) Download: Download full-size image
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Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Zhongliang Gong,Xiaodong Yi,Xi-Gui Gao,Huwenyu Huang,Yu-Xin Ma,Zi-Xuan Liu,Jingmei Zhao,Lijuan Feng,Cheng-Yang Yue
The increasing demands in optoelectronic applications have driven the advancement of organic–inorganic hybrid metal halides (OIHMHs), owing to their exceptional optical transparency and high luminescence performance. In this work, three zero-dimensional OIMH single crystals of (C7H18N2)MBr4 (C7H18N2 = 1-propylpiperazine, M = Cd, Zn, and Mn) were prepared via a facile saturated crystallization method with adjustable luminescence properties. (C7H18N2)MnBr4 displays intensive green light emission with the highest photoluminescence yield (PLQY) of 54.93% originating from the d–d transition of Mn2+. Due to filled d orbital configurations of Zn2+ and Cd2+, (C7H18N2)CdBr4 and (C7H18N2)ZnBr4 exhibited blue light owing to their stronger self-trapped excitons (STEs) recombination. Furthermore, (C7H18N2)CdBr4 and (C7H18N2)ZnBr4 exhibited another red luminescence band after grinding, originating from defect-induced STEs. In addition, due to their excellent PL performance, the white LED fabricated based on (C7H18N2)MnBr4 and (C7H18N2)ZnBr4 has demonstrated a high color rendering index (CRI) of 88.2. This work not only provides a strategy for optimizing the photoluminescence performance by modulating metal ions within the same crystal structure of OIHMHs, but also provides insights into both intrinsic STE emission and the design of high-performance luminescent materials.
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