JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52199
·
IF 3.057
Wenjiao Wang,Mingming Zheng,Jiajia Ren,Mingliang Ma,Xunqian Yin,Tingxi Li,Yong Ma
Magnetic Fe 3 O 4 /MnO 2 /TiO 2 /polypyrrole (PPy) heterostructure as adsorbent for adsorbing Mn 7+ was synthesized by combining hydrothermal method and chemical oxidation method. The heterostructure was characterized by field-emission scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, and vibrating sample magnetometer. Its saturation magnetization is 18.88 emu/g, so it is easy to separate it from the solution. The feasibility of Fe 3 O 4 /MnO 2 /TiO 2 /PPy heterostructure to remove Mn 7+ was researched in detail. It is found that the optimal pH is 2. The initial adsorption rate can reach 4.60 mg/g min. At 288.15 K, the maximum equilibrium adsorption capacity is 202.8 mg/g. Adsorption kinetics follows a pseudo second order model, as well as is determined by through membrane diffusion processes. The Langmuir isotherm model is used to describe the adsorption isotherm behavior. Besides, thermodynamic parameters indicate spontaneous adsorption behavior, and entropy of the endothermic reaction increases. Finally, the cycle test results show that the adsorbent has better cycle performance, displaying broad application prospects.
研究领域:
环境科学
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材料科学
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化学工程
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纳米技术
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污染控制
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Desalination and Water Treatment
·
2024
·
IF 1
Zhi Song,Yu-Long Ma,Cong-Er Li
Tetracycline (TC), a major pollutant in water, has an adverse effect on ecosystem and human health. Thus, it is urgent to remove but still remains a challenging. In this work, a new adsorbent of MnO 2 decorated on sodium hypochlorite treated expanded graphite (MnO 2 /TEG) was developed by an in situ hydrothermal method, which exhibited a highly removal rate of 99.2% to pharmaceutical wastewater treated by flocculation. The structure and morphology of the adsorbent was studied by detailed physical characterization. Meanwhile, the main influencing factors on the adsorption behavior such as pH value, concentration, temperature of the solution, adsorption time, metal oxide species and MnO 2 loading amount were also investigated in detail. It was found that the electrostatic adsorption between Mn 4+ in MnO 2 /TEG and dimethylamino groups in TC molecules played an important role during the adsorption process. These excellent properties proved that the novel composite could be applied to remove TC residues in pharmaceutical wastewater.
研究领域:
环境科学
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水处理技术
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材料科学
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环境污染与控制
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药物残留去除
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CATALYSIS LETTERS
·
2020
·Vol. 151
·期 3
·901-908
·
IF 2.482
Wu Yuting,Yang Long,Wu Bo,Li Jie,Liu Binyao,Ke Gaili,Dong Faqin,Zhou Yong,He Huichao
It has been reported that β -MnO 2 has photocatalytic activity for the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols. Nevertheless, it is hard to exclude the possibility that the oxidative-coupling of 2-naphthols is initiated by β -MnO 2 catalysis in dark due to the insufficient investigations in the related reports. In the present work, the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols with different phases MnO 2 catalysis in dark and under visible-light irradiation were systematically investigated. The results revealed that the oxidative-coupling of 2-naphthols is jointly initiated by MnO 2 catalysis and O 2 -oxidation, not by MnO 2 photocatalysis. Among the α -MnO 2 , β -MnO 2 , γ -MnO 2 and δ -MnO 2 catalysis, β -MnO 2 catalysis has the optimal performance, its selectivity for the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols is close to 100%, and its catalytic capacity could be well retained after multiple using. Our findings provide comprehensive and accurate understanding the catalytic role of MnO 2 for the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols. Graphic In the present work, the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols was proved to be jointly initiated by MnO 2 catalysis and O 2 -oxidation, not by MnO 2 photocatalysis. β -MnO 2 has the optimal catalytic activity for the oxidative-coupling of 2-naphthols relative to α -MnO 2 , γ -MnO 2 and δ -MnO 2 .
研究领域:
催化化学
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有机合成
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材料化学
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物理化学
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纳米催化
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Guoyong Liu,Yanrui Xie,Yanzhen Cao,Yingying Jing
Under the catalysis of MnO 2 , TBHQ can react with Cys to generate fluorescent CDs. • A fluorescence turn-on sensor for detection of TBHQ is proposed based on in-situ formation of fluorescent CDs. • This sensor is capable of quantitatively measuring the concentration of TBHQ in edible oils. Excessive intake of the food additive tert -butylhydroquinone (TBHQ) causes potential hazards to the human body. Designing an easy-to-fabricate and efficient TBHQ sensor is of great research significance. We found that in the presence of MnO 2 , TBHQ can react with cysteine (Cys) to generate fluorescent carbon dots (CDs). Inspired by this simple fluorogenic reaction, a turn-on sensor for TBHQ detection is proposed based on in-situ formation of fluorescent CDs. The sensor offers a linear range of 1–200 μM and a detection limit as low as 0.06 μM. Due to its simple reaction precursors and unambiguous reaction mechanism, this sensor demonstrates good practicability for TBHQ measurement in edible oils. This fluorescence turn-on in-situ sensor, which does not require pre-synthesized materials, offers considerable potential for on-site detection of TBHQ. Download: Download high-res image (122KB) Download: Download full-size image
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Nano Energy
·
2026
·
IF 16.7
Yan Zheng,Linjing Qiao,Zhongyang Wang,Hao Gong,Boyu Liu,Jiajun Wang,Liping Tong,Zhiyuan Zhao,Xiao Zhou,Tongxiang Fan
Chemical pressure engineering of Jahn-Teller distortion enables broadband high emissivity. • A quantitative Jahn-Teller distortion index ( Q OJT ) is established to correlate structure with emissivity. • Ca 2+ doping (Cu, Cr, Mn) 3 O 4 spinel achieves an emissivity of 0.947 across the 0.4–25 μm range. • Exceptional thermal stability is demonstrated with less than 1.4% degradation at 1673 K. • An 11% enhancement in heating rate is achieved in practical radiative heating tests. Infrared radiation materials with broadband emissivity and high thermal stability are highly desirable for energy saving and thermal management applications. However, achieving high emissivity across the visible to mid-infrared range (0.4–25.0 μm) remains challenging due to the discontinuous absorption mechanisms in ceramics. Herein, a strategy based on promoting Jahn-Teller (JT) distortion is proposed to enhance the broadband emissivity of (Cu, Cr, Mn) 3 O 4 spinel. Substituting Cu 2+ with alkaline-earth ions (Mg 2+ , Ca 2+ , Sr 2+ ) introduces tunable chemical pressure, which modifies the local electric field and valence state distribution, thereby regulating the JT structural evolution. An octahedral JT structural descriptor ( Q OJT ) is developed to quantitatively compare JT structural evolution among different compositions. The Q OJT values show a positive correlation with broadband emissivity. The optimized JT structural evolution simultaneously enhances electronic transition, carrier and lattice vibration absorption, enabling synergistic regulation of broadband emissivity across the entire 0.4–25.0 μm spectral range. Among the investigated compositions, Ca 2+ -doped (Cu, Cr, Mn) 3 O 4 exhibits a broadband emissivity of 0.947 and maintains excellent stability under a simulated hypersonic environment at 1673 K. In radiative heating test, it achieves a heating rate approximately 11% higher than that of Al 2 O 3 . These findings demonstrate that chemical pressure provides an effective strategy for regulating JT structural evolution and designing broadband thermal radiation ceramics for high temperature applications. Download: Download high-res image (225KB) Download: Download full-size image Chemical-pressure-tuned Jahn-Teller distortion in (Cu, Cr, Mn) 3 O 4 spinel enables broadband high emissivity (0.947, 0.4–25.0 μm) and exceptional thermal stability up to 1673 K. A quantitative octahedral Jahn-Teller distortion index ( Q OJT ) correlates directly with emissivity performance. The optimized material achieves a 11% acceleration in heating rate, demonstrating its potential for high-temperature radiative transfer and thermal management applications.
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PROGRESS IN SOLID STATE CHEMISTRY
·
2026
·
IF 9.7
Yutong Wang,Hang Zhao,Jiayin Niu,Anurak Weahayee,Wanwisa Limphirat,Theeranun Siritanon,Jingyi Ren,Peng Jiang,Yanfei Sun,Tingting Lu
The development of high-performance narrowband near-infrared second window (NIR-II) phosphors remains a critical challenge in the fields of advanced bioimaging and optical thermometry. Herein, a series of Mn 5+ -doped ABaPO 4 (A = Li, Na, K) phosphors are synthesized via conventional solid-state method, and the effect of A-site alkali metal cations on their crystal structure and luminescence properties is comparatively investigated. Mn K -edge X-ray absorption near-edge structure (XANES) spectroscopy unambiguously confirms that Mn ions are predominantly stabilized in the +5 oxidation state and exclusively occupy tetrahedral [PO 4 ] sites in all three hosts. All samples exhibit characteristic narrowband NIR-II emission in the 1160-1200 nm range originating from the 1 E → 3 A 2 spin-forbidden transition of Mn 5+ . The lattice distortion induced by different A-site cations significantly modulates the doping limit, crystal field strength, thermal stability and temperature sensing performance of Mn 5+ ions. All three Mn 5+ -doped hosts exhibit good thermal stability. The fluorescence decay lifetime of LiBaPO 4 : Mn 5+ reaches 772.436 μs NaBaPO 4 : Mn 5+ shows unique energy level splitting and achieves a maximum relative temperature sensitivity of 2.43% K −1 based on the fluorescence intensity ratio technique. KBaPO 4 : Mn 5+ possesses a highly symmetric crystal lattice and a higher doping limit, with a thermal quenching activation energy ( ΔE ) of 0.414 eV. This work not only provides three promising NIR-II phosphors for bioimaging and optical thermometry, but also offers new insights into the research of Mn 5+ -activated phosphate systems.
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ACS Nano
·
2026
·
IF 17.3
Ouyang Qin,Xiang Shiqi,Guo Yupeng,Yuan Jun,Chen Pan,Tang Qishun,Hu Chunhui,Zhou Wenhu,Huang Shu
Pyrolusite,
a traditional mineral medicine rich in manganese, has
long been used to promote fracture healing; however, its complex composition,
limited bioavailability, and poorly defined mechanisms have hindered
its modernization and clinical translation. Here, we present a nanotechnology-enabled
strategy to modernize pyrolusite by constructing a pyrolusite-derived
MnO 2 nanoplatform for osteo-angio-immunomodulatory bone
repair. Pyrolusite nanosuspensions were prepared via a top-down high-energy
ball-milling approach and incorporated into an injectable chitosan/β-glycerophosphate
thermosensitive hydrogel, thereby enabling precise local delivery
and sustained release. By directly comparing natural pyrolusite with
its monomeric component MnO 2 , we elucidated the pharmacological
substance basis of pyrolusite-mediated bone repair. Comprehensive in vitro and in vivo studies demonstrated
that both materials promote osteogenic differentiation, suppress osteoclastogenesis,
enhance angiogenesis, and induce reparative M2 macrophage polarization,
thereby reshaping the bone-regeneration microenvironment. Transcriptomic
analysis combined with protein–protein interaction mapping
and phosphorylation validation identified the PI3K–Akt signaling
pathway as a central regulatory hub orchestrating these effects, with
MnO 2 exhibiting consistently stronger biological activity
and pathway activation than natural pyrolusite. In a mouse femoral
defect model, MnO 2 -loaded hydrogels significantly accelerated
bone regeneration, improved bone microarchitecture and vascularization,
modulated immune responses, and exhibited excellent in vivo biosafety. Collectively, this work establishes a translatable paradigm
for upgrading traditional mineral medicine into a mechanism-driven
nanotherapeutic platform and highlights the potential of mineral-derived
nanomedicine for high-quality bone regeneration.
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Nature Energy
·
2026
·
IF 70.1
Chu Shiyong,Wang Liguang,Bian Jingjing,Cheng Chen,Tian Jiaming,Sheng Chuanchao,Zhuo Zengqing,Shi Tianze,Guo Jinghua,Zhang Liang,Lu Jun,Zhou Haoshen,Guo Shaohua
Lattice-oxygen redox in layered oxides can enhance energy density, but its limited reversibility causes structural instability during deep cycling. Here we develop an iron-mediated strategy to regulate lattice-oxygen redox in layered oxide cathodes. In the Na 2/3 Mn 7/12 Mg 1/4 Fe 1/6 O 2 cathode, Fe ions act as redox mediators, with Fe 4+ capturing electrons from lattice oxygen during charging and Fe 2+ donating electrons back to oxidized oxygen during discharging through chemical pathways. With the assistance of iron mediation, the reversibility of lattice-oxygen redox is dramatically improved from 75% to 99%. As a result, the lattice-oxygen-activated cathode enables a sodium-ion pouch cell to achieve an energy density of 206 Wh kg −1 and operate stably for 100 cycles at 50 mA g −1 , with a capacity retention of 87.8%.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Huifen Yu,Yunxuan Ji,Xinyu Cui,He Qi,Di Zhou,Liang Chen,Jun Chen
High-entropy superparaelectrics design boosts capacitive energy storage. • Nanodomains, multiple oxygen octahedral tilts, and refined grains collectively give rise to a large Δ P and high E b . • Achieved a superior W rec of 14.7 J cm −3 at an ultrahigh E b of 78 kV mm −1 • Exhibiting excellent frequency/temperature stability and pulsed charge-discharge capability Lead-free dielectric ceramics are considered pivotal for next-generation pulsed power capacitors, yet their low energy storage density critically impede progress toward high-performance and miniaturized devices. Herein, we design high-entropy superparaelectrics in lead-free perovskite ceramics to enhance energy storage properties. This strategy can induce the formation of small-sized nanodomains, multiple types of oxygen octahedral tilts, and refined grain microstructures, collectively enabling rapid polarization response, delayed polarization saturation, large polarization difference, and enhanced breakdown electric field. By leveraging this design, an outstanding recoverable energy density of 14.7 J cm −3 is achieved in the 1/3NaNbO 3 -1/3Bi 0.5 Na 0.5 TiO 3 -1/3SrTiO 3 lead-free ceramic under an ultrahigh breakdown field of 78 kV mm −1 , accompanied by excellent frequency and temperature stability as well as superior pulsed charge-discharge performance. This work demonstrates that designing high-entropy superparaelectrics is an effective approach to enhance energy storage properties, offering significant potential for advanced energy storage applications. Download: Download high-res image (184KB) Download: Download full-size image
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ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 31
·42557-42571
·
IF 7.8
Liu Ming,Hua Yukai,Ning Meng,Liu Yong
O3- and P2-type layered oxides are promising cathode candidates for sodium-ion batteries (SIBs). However, their practical application is severely limited by inherent single-phase drawbacks, barely alleviated via elemental doping. Herein, we report an O3/P2 biphasic layered oxide cathode, Na 0.9 Ni 0.2 Cu 0.05 Zn 0.005 Mg 0.02 Fe 0.2 Mn 0.5 Ti 0.02 Sn 0.005 O 2 (denoted as Na 0.9 NiCuZnMgFeMnTiSn) fabricated via an eight-component nonequimolar medium-entropy strategy. Distinguished from conventional high-entropy configurations relying on equimolar elemental ratios, our nonequimolar design employs electrochemically active elements (Ni, Mn, Fe, and Cu) as the dominant constituents to stabilize the crystal structure and deliver high reversible capacity. The O3 phase (contributing higher capacity) acts as the dominant component in the biphasic structure, with an optimized O3/P2 phase ratio of 81.1:18.9. Minor inactive elements (Zn, Mg, Ti, and Sn) and the secondary P2 phase synergistically promote solid-solution reaction behavior, suppress detrimental phase transitions, and accelerate Na + diffusion kinetics. Consequently, the Na 0.9 NiCuZnMgFeMnTiSn cathode delivers a reversible capacity of 143.4 mAh g −1 at 10 mA g −1 , together with remarkable cycling stability (86.0 mAh g −1 retained after 100 cycles at 200 mA g −1 ) and superior rate capability (81.8 mAh g −1 at 300 mA g −1 ). This work provides a feasible multielement medium-entropy strategy for developing stable, high-performance layered oxide cathodes for advanced SIBs.
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PubMed
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ADVANCED MATERIALS
·
2026
·
IF 29.1
Lihao Tang,Liwei Jiang,Yang Huang,Rui Bai,Jingchen Lian,Haibo Wang,Hao Jiang,Bowen Wang,Xubin Wang,Yuyao Wang,Jian Peng,Fei Xie,Xiaohui Rong,Liquan Chen,Yong-Sheng Hu,Yaxiang Lu
Amorphous halide-based solid electrolytes (SEs) are promising candidates for all-solid-state Na batteries (ASSNaBs) due to their structural flexibility and favorable mechanical properties. Among them, aluminum-based halide electrolytes are particularly attractive owing to their low cost and oxidative stability; however, previously reported systems typically exhibit limited room-temperature ionic conductivity (<1 mS cm −1 ). In this work, we report the synthesis of a transparent, viscoelastic Na–Al SE with the specific composition 0.6NaClO–AlCl 3 –0.175SeO 2 , achieved through the strategic introduction of dual oxygen sources (NaClO and SeO 2 ). This approach enables the modulation of charge carrier concentrations while simultaneously supplying sufficient oxygen. Furthermore, we introduce the concept of deoxygenation enthalpy to rationalize the selection of these dual oxygen sources among various oxide candidates. The resulting electrolyte achieves a high Na + conductivity of 2.03 mS cm −1 at ambient temperatures, among the highest reported for Na–Al halide electrolytes. Molecular dynamics simulations confirm that segmental motion within the disordered framework actively facilitates Na + transport, underpinning the observed viscoelastic behavior. When integrated into ASSNaB with uncoated NaNi 0.4 Fe 0.2 Mn 0.4 O 2 cathode, the electrolyte enables stable long-term cycling and superior thermal compatibility, demonstrating practical applicability. This work establishes a new paradigm in rational precursor design for high-performance viscoelastic SEs.
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Nature Communications
·
2026
·
IF 18.1
Xu Shao-Wen,Liu Wei,Zhu Xu,Hong Zhuozheng,Qian Lisheng,Cheng Chen,Chen Kai,Zhang Liang,Ma Chuansheng,Liu Mengting,Shi Le,Xiao Yao,Dou Shi-Xue,Cheng Yonghong,Wang Peng-Fei
Fast-charging capabilities of sodium-ion batteries have emerged as a pivotal objective within the energy storage fields. Sodium layered P2-type oxide positive electrodes are considered promising for fast charging due to their inherent fast Na + mobility. However, their electrochemical polarization and interfacial charge transfer especially at high state of charge are limiting factors in quick kinetic response for large current. Herein, we demonstrate that a typical P2-type positive electrode (Na 0.7 Ni 0.27 Mn 0.53 Cu 0.04 Fe 0.08 Ti 0.08 O 2 ) achieves high-rate capacities through avoiding octahedral stacking faults, maintaining lattice oxygen activity and controlling anion-specific adsorption. The intermediate Z-phase intergrowth structure mitigates kinetic polarization and thermodynamic hysteresis by simultaneously suppressing the unfavorable phase evolution from P2-type to O2-type and irreversible oxygen redox. The potential-dependent competitive adsorption mechanism between anions and solvent molecules is revealed within the inner Helmholtz plane, where optimized anion-specific adsorption elevates potential difference between electrodes and inner Helmholtz plane, accelerating charge transfer across the electrode/electrolyte interface. Furthermore, the F-rich cathode/electrolyte interphase generated from inner Helmholtz plane mitigates transition metal dissolution and surface lattice collapse for stable long-term cycling. This study highlights the synergistic coupling interaction between bulk phase stability and interfacial environment optimization in ensuring fast Na + /charge transport kinetics for sodium-ion batteries.
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