CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yanxu Wang,Lijia Huang,Tian C. Zhang,Yan Wang,Shaojun Yuan
Ammonia gas (NH 3 ) is a notorious malodorous pollutant with detrimental effects on environment and human health. Removing NH 3 through photocatalytic oxidation remains a challenging task due to unclear reaction mechanisms. In this study, DFT simulation results revealed that C doped TiO 2 could extend the photo-response range to the visible region, but the introduction of deep impurity levels was found to accelerate photogenerated carrier recombination. Fortunately, the rational doping of Mo was found to mitigate this negative effect. Accordingly, Mo, C co-doped TiO 2 was synthesized via a facile low-temperature calcination process, resulting in unique band structure that enhanced the photocatalytic oxidation of NH 3 . Notably, in-situ DRIFTS and DFT results demonstrated that the gradual reaction of NH 3 adsorbed on Mo atoms with oxygen species through the N 2 H 4 mechanism, promoting the formation of N 2 . These findings offer insights into the design of efficient photocatalysts for NH 3 removal under visible light, and present a promising technology for indoor air pollution control.
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COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Bingbing Qiu,Donghui Zhang,Ruiming Fang,Yanfang Wang,Banglong Shen,Junhao Dai,Huaqiang Chu
Electrocatalytic hydrogen production is a green and feasible method for obtaining hydrogen energy. However, the bottlenecks of high cost, low catalytic activity and inferior stability urgently need to be addressed, and constructing advanced catalysts with optimized microscopic morphology and crystal structure is a feasible and effective strategy to overcome this barrier. Herein, an artful strategy of in-situ grown coupled with N doping and C encapsulation was employed to obtain the NC/NiO–Mo/NF with biomimetic cattle stomach-liked porous structure, which can offer shortcut for ion transportation and expose more active sites for H∗ adsorption. Particularly, the constructed NiMoO 4 –NiO heterojunction in NC/NiO–Mo/NF can significantly boost the hydrogen evolution activity. Meanwhile, the density functional theory (DFT) confirm that the construction of the crystalline-amorphous heterojunction induces electron transfer from NiMoO 4 to NiO, promoting a downshift in the d-band center, thereby achieving a near-thermoneutral free energy for the hydrogen evolution reaction (HER). The de-signed electrocatalyst exhibits exceptional HER activity, with a small overpotential of 48 mV to achieve a current density of 10 mA cm −2 . It is important that NC/NiO–Mo/NF exhibits exceptional HER stability, with current density of 50 mA cm −2 for 100 h. The finding provides a feasible strategy for the fabrication of nonprecious-metal-based HER electrocatalysts with high activity and stability toward industrial water electrolysis.
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 13
·期 6
·120413
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IF 7.2
Yiting Lei,Yulong Ma,Yonggang Sun,Liqiong Wang
Lignin, a three-dimensional network biopolymer, presents catalytic challenges due to its recalcitrant C(aryl)–O/C(aryl)–C bonds and diverse oxygen functionalities. To address this, we engineered Mo 2 C-decorated Ni-Mo bimetallic catalysts (Ni- Mo 2 C@NC-x) via dopamine-mediated self-assembly, achieving unprecedented 2D nanosheet architectures. The optimized Ni-Mo 2 [email protected] exhibited a 10.2-fold surface area enhancement (230.4 m 2 ·g⁻ 1 vs. 22.6 m 2 ·g⁻ 1 for Ni@NC), maximizing accessible active sites. The highly dispersed MoC 2 phase enhanced the graphitization degree, facilitated electron transfer while simultaneously increased Lewis and Brønsted acid densities. Furthermore, the Mo 2 C phase effectively enriched Mo 5+ species, which promoted selective cleavage of C–O and C–C bonds via oxygen vacancy generation. The synergistic interplay between the Mo 2 C phase and Ni metal centers achieved 95.69 % lignin oil conversion with 85.25 % cycloalkane selectivity. This work establishes a multifunctional catalyst design paradigm where tailored defect-acid cooperativity overcomes lignin depolymerization-deoxygenation trade-offs.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Junshuo Cui,Shuang Liu,Liangyu Guo,Zhongjun Li,Zuozhen Zhang,Ying Xiong
Uniform dispersion of graphene is a prerequisite for the preparation of high-performance graphene-based composites. In this study, a new type of coupling agent which contains a thiophene center and two silanol groups (TPSi) is synthesized via amino-epoxy ring-opening reaction. The molecule shows good ability for dispersing graphene in water based on its amphiphilic feature. Dynamic light scattering (DLS) reveals that the concentration of graphene reaches 3 mg mL −1 at the weight ratio of TPSi-to-graphene of 1:1. It also stabilizes graphene well when diminishing the weight ratio to 0.5:1. By freeze-drying the dispersion, TPSi/graphene composite is prepared and it shows good adsorption performance for Mo(VI) in water. The maximum capacity can reach to 134.87 mg g −1 at pH 3 according to the Langmuir isotherm model. The composite also exhibits fast adsorption kinetics that equilibrium could be achieved within 2 h. TPSi plays a key role for the uniform distribution of graphene and improves the adsorption capability of graphene-based composite for Mo(VI) ions.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2025
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IF 6.2
Lixia Chen,Nan Wang,Qiuhua Ma,Qiuling Chen
Sm 3 + /Sr 2+ -co-doped Bi 5 FeTi 3 O 15 (BFTO) nanocrystals were hydrothermally synthesized and embedded into a TeO 2 -based magneto-optical (MO) matrix using a melt-quenching technique. original BFTO nanocrystals exhibited 30–50 nm- hexagonal platelet-like morphology, which reduced to 20–35 nm after Sm 3+ /Sr 2+ doping due to lattice distortions and strain effects. The X-ray diffraction confirmed the crystal structure, while Raman and X-ray photoelectron spectra revealed charge redistribution and local asymmetry. Critically, Electron Paramagnetic Resonance analysis directly confirmed the presence of increased oxygen vacancies. These combined factors enhance the nonlinear optical (NLO) and chiroptical responses. The optimized 2 mol% Sm 3+ /Sr 2+ - Bi 5 FeTi 3 O 15 doped BFSS2 showed the highest third-order nonlinear susceptibility (χ (3) = 8.44 × 10 −11 esu), nonlinear refractive index (n₂ = 5.82 × 10 −10 m 2 /W), and nonlinear absorption coefficient (α 3 = 4.5 × 10 −11 m/W), demonstrating strong two-photon absorption (TPA) and Kerr nonlinearity. Photoluminescence spectra exhibited intense red emission at 610 nm and 645 nm, with BFSS2 achieving the highest circulary polarized luminescence (CPL) dissymmetry (g lum = −0.85) due to enhanced electric dipole –magnetic dipole interactions. Magnetic circularly polarized luminescence (MCPL) was significantly enhanced by Fe 2+ /Fe 3+ charge transfer and spin-orbit coupling. BFSS2 also exhibited the highest saturation magnetization (M s = 28 emu/g) and Verdet constant (28.3 rad/T·m at 633 nm), confirming strong magneto-chiral effects. These findings highlight the synergy of structural asymmetry, charge redistribution, and MO coupling in optimizing CPL, MCPL, and NLO properties, making BFSS2 a promising candidate for chiral photonic and magneto-optical applications.
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ANALYST
·
2022
·Vol. 147
·期 8
·1631-1640
·
IF 5.227
Yunkang Ma,Chenhui Wu,Wenjie Yang,Zhigang Gao,Lihua Chen
Mycoplasma ovipneumoniae (MO), a disease-causing pathogen with some of the highest levels of morbidity and mortality, can spread silently at the herd level. A novel alternative nanoprobe for MO was prepared using porous metal–organic frameworks (MOFs) as the scaffold and hairpin DNA with specific sequences of MO and G4 segments as the probe. This preparation was based on the strong fluorescence emission by ThT (thioflavin T) in the limitation of G-quadruplexes with a cavity structure. The use of MOFs effectively limited the folding behavior of G4 as a part of the probe to improve the defect of the strong background signal caused by the free-state G4Probe in a buffer. The results from the selectivity experiment showed that only a trace amount of the target with lower ΔG could be the “key” to the highly efficient triggering of the release behavior of the G4Probe from MOFs and the subsequent change in the fluorescence behavior of ThT. The DNA targets could be determined by observing the change in the signal. More importantly, the probe showed a low detection limit and a good linear correlation between the concentration of target DNA ranging from 10−10 M to 10−6 M not only in buffer but also in natural complex media. Moreover, the operation involved in the whole strategy was simple and the total cost was low. These findings demonstrated the value of the probe in further clinical diagnosis. This study reports the successful construction of a ΔG-sensitive sensor for MO for the first time.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 9
·1-13
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IF 2.8
Gong Zonggui,Wang Nanlan,Guo Haoxuan,Zhu Peishu,Wang Qijing,Yu Hang,Zhang Yu,Gao Min,Zheng Xinghua
Due to the increasingly urgent safety and energy density concerns of lithium-ion batteries, more and more attention has been attracted by the Li 7 La 3 Zr 2 O 12 (LLZO)-based solid electrolytes with high ion conductivity and chemical stability against Li-metal. However, to prepare the high-quality LLZO ceramic electrolyte with high-ion conductivity and density, there is still a big challenge of the serious “Li-loss” and the abnormal grain growth during the long-time high-temperature sintering process. A novel covered sintering method is put forward to prepare the high-quality Mo-doped LLZO (LLZMO) ceramic electrolyte. The sintering strategy effectively suppresses the Li-loss to obtain the LLZMO dense ceramics with cubic garnet phase and tight grain boundaries. The LLZMO ceramics sintered at lower temperature of 1050 °C for 2 h via the novel covered sintering exhibit high density ( ρ r = 92.3%) and high-ionic conductivity of 6.08 × 10 –4 S cm −1 at 25 °C, which are close to those of LLZO-based ceramics prepared by hot pressing sintering, ultrafast high-temperature sintering (UHS). The novel covered sintering provides an energy-saving, low-cost and high-efficient strategy to prepare the high-quality LLZO-based ceramics electrolyte.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Worku Lakew Kebede,Kuo Dong-Hau,Chen Xiaoyun
Metal oxide semiconductor photocatalysts have received remarkable consideration as a promising technology for environmental remediation and energy conversion. Oxysulfide semiconductors have narrow band gaps which are appropriate for photocatalytic removal of toxic organic pollutants under visible light illumination. For the elimination purpose of these pollutants, Mo(O,S) 2 , Mn(O,S) 2 , and Mn–Mo(O,S) 2 oxysulfide catalysts containing various Mn contents were synthesized at low temperatures via a simple method. The structural, morphological, electrochemical, compositional, and optical properties of the as-synthesized catalysts were exhaustively characterized. The photocatalytic degradation activity of the bares Mo(O,S) 2 , Mn(O,S) 2 , and other Mn–Mo(O,S) 2 compositions were evaluated over different types of organic pollutants under visible light illumination. The addition of Mn in Mo(O,S) 2 structure improved the photodegradation activity, and Mn–Mo(O,S) 2 -30 was found to be the best composition with superior photodegradation performance towards the four cationic, anionic, and neutral dyes. The degradation efficiency of 10 ppm of MB, and MO dyes reach 99.7 % and 98.6 %, within 30 and 120 min, respectively. Mn–Mo(O,S) 2 -30 catalyst also shows a good photodegradation performance on Rh B and NR organic pollutants. According to the recycling test, the catalyst exhibited excellent performance. The photodegradation follows pseudo-first order kinetics with a rate constant of 0.097 and 0.036 min −1 for MB and MO dyes, respectively. The trapping experiment showed that superoxide anion radicals (O 2 •- ) and holes (h + ) are the responsible active species for the degradation on MO and MB, respectively. The novelty of using Mn–Mo(O,S) 2 -30 for various dyes degradation lies in its remarkable catalytic properties.
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Small
·
2024
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IF 13
Guonan Cui,Yanchun Yang,Lulu Bai,Rui Wang,Zhihui Gong,Yongjun Cao,Shuyu Li,Xiaogong Lv,Chengjun Zhu
A suitable interlayer between the Mo back electrode and kesterite absorber layer has been proven to have a positive effect on limiting the bulk defects of the absorber by the constitute diffusion. Here, a thin Bi 2 S 3 layer is used as the back-interface intermediate layer for the first time, this innovative approach allows for simultaneous modification of the back contact and reduction of bulk defects, resulting in improving the power conversion efficiency of the kesterite device from 9.66% to 11.8%. The evaporated Bi 2 O 3 thin films turn into the Bi 2 S 3 interlayers after sintering the Cu 2 ZnSnS 4 precursor thin films. The Bi 2 S 3 interlayer can inhibit the decomposition reaction of back contact and suppress the formation of the secondary phases. It can also optimize the Fermi level offset and promote the separation of the photoinduced carriers, resulting from its characteristic of high work function. Besides, a small part of the Bi element can diffuse into Cu 2 ZnSn(S, Se) 4 film and induce the crystal growth and restrain Zn-related defects, which is attributed to forming the low melting-point liquid BiSe x phase during the high-temperature selenization process. The conclusions highlight the bifunction of the thin Bi 2 S 3 intermediate layer, which can provide a new approach to improve the photoelectric conversion efficiency of kesterite solar cells.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Li Gong,Kai Lan,Xiang Wang,Xiaokang Huang,Pengbo Jiang,Kaizhi Wang,Ming Yang,Lei Ma,Rong Li
Exploration of noble-metal-free, highly-efficient and durable catalysts for Hydrogen evolution reaction (HER) remains a challenge. In this work, the development of carbon-coated cobalt-molybdenum-phosphide nanosheets supported on carbon cloth (Co-Mo-P@C) is successfully demonstrated. To obtain a better electrocatalystic performance, the different amount of glucose was added into the reaction system during hydrothermal process. Benefiting from the 2D structure, high electrical conductivity and sufficient active sites, the Co-Mo-P@C contained 0.5 mmol glucose exhibits relatively good catalytic activity for HER with low over poentials at −96 mV and −162 mV @ 10 mA cm −2 in acidic and alkaline medias respectively and the Tafel slope of 52.9 mV dec −1 and 34.3 mV dec −1 . Additionally, the catalyst also shows good durability in the both electrolytes.
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SENSORS
·
2025
·Vol. 25
·期 9
·2634
·
IF 3.5
Mengxue Xu,Yihong Zhong,Hongpeng Zhang,Yi Tao,Qingqing Shen,Shumin Zhang,Pingping Zhang,Xiaochun Hu,Xingqi Liu,Xuhui Sun,Zhenxing Cheng
HighlightsWhat are the main findings?The problem of dichloromethane “poisoned” MOS materials was well solved.Gas sensing mechanism of dichloromethane on the MOS material was elucidate.What is the implication of the main finding?The best performance of significant response and excellent recoverability by the MEMS sensor to dichloromethane is attributed to a synergetic effect from Mo and Ni co-doping into SnO2.Kinetically, the transportation of dichloromethane molecules onto the surface determines the response process. Thermodynamically, the output steady electronic signal of the MEMS sensor follows the equations newly derived by statistical mechanics.The challenging problem of chlorine “poisoning” SnO2for poorly recoverable detection of dichloromethane has been solved in this work. The materials synthesized by Ni or/and Mo doping SnO2were spread onto the micro-hotplates (<1 mm3) to fabricate the MEMS sensors with a low power consumption (<45 mW). The sensor based on Mo·Ni co-doped SnO2is evidenced to have the best sensing performance of significant response and recoverability to dichloromethane between 0.07 and 100 ppm at the optimized temperature of 310 °C, in comparison with other sensors in this work and the literature. It can be attributed to a synergetic effect of Mo·Ni co-doping into SnO2as being supported by characterization of geometrical and electronic structures. The sensing mechanism of dichloromethane on the material is investigated. In situ infrared spectroscopy (IR) peaks identify that the corresponding adsorbed species are too strong to desorb, although it has demonstrated a good recoverability of the material. A probable reason is the formation rates of the strongly adsorbed species are much slower than those of the weakly adsorbed species, which are difficult to form significant IR peaks but easy to desorb, thus enabling the material to recover. Theoretical analysis suggests that the response process is kinetically determined by molecular transport onto the surface due to the free convection from the concentration gradient during the redox reaction, and the output steady voltage thermodynamically follows the equation only formally identical to the Langmuir–Freundlich equation for physisorption but is newly derived from statistical mechanics.
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高影响因子
Desalination and Water Treatment
·
2025
·
IF 1
Qian Wang,Haifeng Yang,Shanni Lin,Wei Ji,Shu Zhang,Wenjie Wang,Jiazheng Yu,Jingwen Gao,Xiulei Fan
The advanced oxidation processes (AOPs) employing bimetallic catalysts for peroxodisulfate (PDS) activation has attracted considerable attention. A novel composite, polyethylene mulch-sorghum straw biochar (Fe-Mo 0.1 /N-PSC), was synthesized via hydrothermal activation, co-impregnation, and high-temperature pyrolysis to enhance catalytic efficiency and facilitate agricultural solid waste valorization. In the Fe-Mo 0.1 /N-PSC/PDS system, this composite efficiently activated PDS, achieving 91.86 % tetracycline (TC) removal within 3 minutes, with a pseudo-first-order rate constant of 0.1426 min⁻¹ , surpassing comparable catalytic systems. The influences of PDS concentration, catalyst dosage, pH, and temperature on TC degradation were systematically investigated. X-ray photoelectron spectroscopy indicated that the reactive Mo 4 + promoted the cycle of Fe²⁺/Fe³ ⁺, accelerating reaction kinetics. Quenching and electron paramagnetic resonance analyses confirmed the generation of radicals (•OH, SO₄•⁻, O₂•⁻), which actively contributed to TC degradation. Additionally, the persistent free radicals derived from PE during hydrothermal activation further enhanced degradation efficiency. Liquid chromatography-mass spectrometry identified degradation intermediates, elucidating possible pathways and proving the toxicity of intermediates greatly reduced. The system exhibited excellent stability, maintaining over 75 % degradation efficiency after five cycles with minimal metal leaching, offering valuable insights for practical applications. This study highlights Fe-Mo 0.1 /N-PSC as an effective PDS catalyst and a sustainable strategy for agricultural waste reutilization.
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