ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Gang Li,Han Hua,Qican Zhou,Yiping Su,Chenye Wang,Xuehua Shen,Zuotai Zhang
Mechanochemical carbonation (MC) of alkaline solid wastes (ASW) has emerged as a promising strategy for CO2 sequestration. However, CaCO3 polymorphs formed during carbonation exhibit distinct transformation pathways that influence both sequestration durability and downstream utilization. Here, we elucidate how inherent Mg and Si species in ASW govern CaCO3 polymorph during MC. Using steel slag (SS) and blast furnace slag (BFS) as representative ASW with distinct Si/Mg availabilities, and NaHCO3 as a carbon source, we systematically investigated polymorph evolution, carbonation kinetics, and microstructure development. During carbonation, SS initially forms calcite (31.7 wt %), which transforms into monohydrocalcite (MHC, 20.4 wt % at 12 h), whereas BFS continuously yields aragonite (30.1 wt % at 12 h). These pathways stem from distinct gel-mediated microenvironments: amorphous silica gel in SS creates localized carbonate supersaturation and hydrous conditions, which kinetically promote MHC reprecipitation; whereas magnesium silicate hydrate-like (M-S-H-like) gel in BFS provides Mg-enriched surfaces (Mg/Ca = 0.98) that facilitate aragonite nucleation. Furthermore, model experiments employing carbide slag (CS, primarily Ca(OH)2) with controlled Si/Mg additives further confirm this mechanistic relationship. These findings establish a gel-mediated mechanism for CaCO3 polymorph selection and provide a basis for rationally tuning carbonation products in complex waste-derived systems.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 43
·34240-34255
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IF 4.4
Han Qianyue,Sun Youping,He Jiangmei,Zhang Kaifei,Liang Ting,He Chengwei
This study investigated the effects of rolling speed on the microstructure, mechanical properties, and corrosion behavior of Mg–2Zn–0.4Ca magnesium alloy in SBF. The results indicate that rolling speed strongly controls dynamic recrystallization (DRX), grain size, and dislocation density. Although the sample rolled at 768 mm/s showed a relatively high fraction of DRXed grains, retained coarse deformed grains and high GND density caused pronounced microstructural inhomogeneity. At 1024 mm/s, the alloy obtained the finest average grain size (3.51 μm) and the lowest dislocation density, achieving a good balance between grain refinement and defect regulation. Consequently, its ultimate tensile strength (UTS) and elongation (EL) reached 291.39 MPa and 9.9%, respectively. When the rolling speed increased to 1280 mm/s, DRX was suppressed, while the fractions of deformed grains and unindexed regions increased, leading to degraded mechanical properties. Corrosion tests revealed that the 1024 mm/s sample had the lowest corrosion rate, hydrogen evolution volume, and corrosion current density, owing to its homogeneous microstructure, reduced local distortion, and dense, stable corrosion product layer. Overall, moderate rolling speed can synergistically improve microstructural uniformity, mechanical properties, and corrosion resistance, providing guidance for plastic processing of biodegradable Mg alloy sheets.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Yongman Niu,Yunyu Zhao,Jie Hao,Yupeng Wang,Junyi Song,Chong Peng,Changlong Bi,Shuyi Yang,Tao E
Converts WD and IT into efficient adsorbent MBMS, achieving dual waste valorization. • Innovative “adsorb-modulate-capture” strategy enables synergic MB and Cu 2+ removal. • MBMS is a highly effective adsorbent towards dual pollutants with > 99% removal rate. • MBMS has good recyclability and can be used as soil fertiliser after deactivation. The Cu 2 + and methylene blue (MB) composite pollution generated by the intensive production model adopted in recirculating aquaculture systems has become a critical challenge requiring urgent solutions in the field of fishery environmental remediation. Existing remediation technologies commonly suffer from issues such as competitive adsorption of pollutants, poor structural stability, and limited electron transfer, making it difficult to achieve efficient synergistic treatment of composite pollution systems. This study utilized waste dander (WD) and Mg slag tailings (IT) as raw materials to prepare a novel adsorbent (MBMS) through an impregnation-calcination-ball milling-recalcination process. Based on the pathway strategy of “priority response, electrostatic regulation and synergistic adsorption” it achieved highly efficient, synergistic, and stable treatment of Cu 2+ and MB co-pollution in aquaculture effluent. Adsorption experiments demonstrate MBMS exhibits outstanding synergistic treatment efficacy for Cu 2+ and MB composite pollution, achieving removal rates of 99.27% for Cu 2+ and 99.79% for MB. This study further elucidates the interaction mechanisms and synergistic treatment pathways through electrostatic potential, charge distribution, density of states, and frontier molecular orbital analyses. Additionally, spent MBMS was utilized as soil fertilizer in alfalfa cultivation experiments to evaluate its value-added application potential. This research not only provides a novel approach for solid waste reduction and high-value utilization of WD and IT but also offers a technically viable solution for the synergistic treatment of Cu 2+ and MB composite pollution in aquaculture effluent, delivering both environmental benefits and practical application value. Download: Download high-res image (277KB) Download: Download full-size image
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JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Bing Yu,Guoqiang You,Lei Wang,Kaixuan Zhou,Yong Zhao,Bin Jiang
The Gd-rich cubic phase, which is ubiquitous in Mg-Gd alloys, plays a crucial role in determining their mechanical properties. However, its chemical composition has long been debated, and it has often been misidentified as MgGd or GdO. This study focuses on the origin and hereditary characteristics of the cubic phase. Through multiscale characterization techniques such as X-ray diffraction analysis, scanning electron microscopy, focused ion beam, and transmission electron microscopy, the microstructural evolution of three as-cast Mg-Gd binary alloys and their diluted counterparts (Mg-10 wt% Gd) was systematically investigated. The spatial distribution, crystal structure, and chemical composition of the cubic phase were examined. Microstructural analysis reveals that the cubic phase in the Mg-Gd binary alloy exhibits a face-centered cubic structure (lattice parameter a ≈ 0.5328 nm), and it is identified as GdH 2 . Additionally, trace amounts of α-Gd are detected. Upon dilution to Mg-10 wt% Gd, the GdH 2 phase remains largely undissolved, demonstrating stable hereditary characteristics, whereas the submicron α-Gd phase completely dissolves. The hereditary characteristics of GdH 2 are closely associated with the H content in the melt and the initial microstructure of the Mg-Gd binary alloy. This study resolves the existing controversy regarding the cubic phase, establishing a theoretical foundation for optimizing the design of Mg-Gd alloys and enhancing the strength–ductility synergy.
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RARE METALS
·
2026
·Vol. 45
·期 6
·e70378
·
IF 12.1
Tao Wen,Xiaohan Chen,Honglin Hu,Xiteng Yan,Krongthong Kamonsuangkasem,Gang Feng,Rongbin Zhang,Runping Ye,Sibudjing Kawi
en This link goes to a English section zh This link goes to a Chinese section Catalytic NH 3 decomposition has garnered substantial attention for hydrogen transformation and storage. Ni-based catalysts continue to suffer from limited thermal stability and suboptimal low-temperature activity, largely attributed to an incomplete understanding of the structure-activity relationships and reaction mechanisms governing their performance. In this study, we designed and constructed a novel Y-Mg bimetallic oxide support system to synergistically modulate the properties of Ni-based catalysts for NH 3 decomposition. Unlike conventional Ni/MgO or Ni/Y 2 O 3 , the precisely tuned Y/Mg ratio in the 20Ni/YMg 8 catalyst creates a unique interface that couples the structural and electronic advantages of both components. A series of Ni-based catalysts with varying Y/Mg ratios was synthesized, and the 20Ni/YMg 8 catalyst with a 1:8 ratio of Y: Mg achieved a hydrogen production rate of 29.77 mmol g cat −1 min −1 at 600°C. Characterizations revealed that Mg incorporation primarily increased surface area and refined Ni dispersion, whereas Y enhanced reducibility and active metal distribution. More importantly, their synergy optimally tailors the electronic structure of Ni and the distribution of basic sites, which collectively promote *NH 2 formation and accelerate N 2 desorption—the rate-determining step. Mechanistic studies confirmed that the optimized catalyst promoted *NH 2 formation and accelerated N 2 evolution, indicating enhanced NH 2 activation and dehydrogenation. This study presents a rational design approach of bimetallic supports to modulate structural and surface properties, offering valuable insights into the development of efficient and stable Ni-based catalysts for ammonia decomposition. 摘要 en This link goes to a English section zh This link goes to a Chinese section 氨催化分解因其在氢能转化与储存方面的潜力而备受关注。镍基催化剂仍面临热稳定性不足和低温活性欠佳的挑战,这主要归因于对其构效关系及反应机理的认识尚不完善。本研究中,我们设计并构建了一种新型的Y-Mg双金属氧化物载体体系,以协同调控镍基催化剂的氨分解性能。与传统的Ni/MgO或Ni/Y 2 O 3 催化剂不同,20Ni/YMg 8 催化剂中精确调控的Y/Mg比例形成了一种独特的界面,耦合了两种组分的结构优势与电子优势。通过合成一系列不同Y/Mg比例的镍基催化剂,我们发现Y:Mg比例为1:8的20Ni/YMg 8 催化剂在600°C时达到了29.77 mmol g cat −1 min −1 的产氢速率。表征结果显示,Mg的引入主要增加了比表面积并优化了Ni的分散性,而Y则增强了还原性和活性金属分布。更重要的是,二者的协同作用精准调控了Ni的电子结构和碱性位点分布,共同促进了NH 2 的形成并加速了N 2 脱附(速率控制步骤)。机理研究证实,优化后的催化剂促进了 NH 2 的形成并加快了N 2 的生成,表明NH 2 的活化和脱氢过程得到增强。本研究为双金属载体的理性设计以调控结构及表面性质提供了新思路,为开发高效稳定的氨分解镍基催化剂提供了重要见解。
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Qingbo Zhang,Zhenxuan Ma,Jiaguang Zheng,Ao Xia,Cong Li,Panpan Zhou
This study presents the synthesis of novel Mg(BH 4 ) 2 @V 2 C, Mg(BH 4 ) 2 @Nb 2 C and Mg(BH 4 ) 2 @Ti 3 C 2 composites using a solution-based nanoconfinement strategy, achieving robust architecture of Mg(BH 4 ) 2 onto Mxene structures. Among these composites, the Mg(BH 4 ) 2 @V 2 C composite exhibited an initial dehydrogenation temperature of 76.4 °C and released 9 wt% hydrogen at 300 °C, which exhibited the optimal hydrogen release behavior. Its two-step dehydrogenation activation energies (104.44 kJ/mol and 118.52 kJ/mol) were significantly lower than those of pure Mg(BH 4 ) 2 , showing improved dehydrogenation kinetics. After four absorption-desorption cycles, the composite could still desorb 4.9 wt% hydrogen, demonstrating excellent cycling stability. Further structural investigations revealed that V 2 C actually acted as a “functionalized” matrix, which improved hydrogen storage through a combination of nanoconfinement and catalytic effects, promoting both hydrogen desorption and absorption. This work provides critical insights for designing high-performance hydrogen storage materials and advances the development of next-generation storage systems.
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高影响因子
JOM
·
2025
·
IF 2.3
Zhang Kaifei,Sun Youping,He Jiangmei,Li Wangzhen,Liu Chenglong,Li Qian
This study investigated the effects of different homogenization treatments on the microstructure, mechanical properties, and in vitro degradation behavior of an Mg-2Zn-0.1Ca alloy. The results indicated that homogenization significantly increased the alloy's grain size, reaching 1327.5 μm after 400°C/12-h treatment, an approximately 38.8% increase compared to 956.27 μm for the as-cast alloy. Regarding mechanical properties, homogenization markedly improved the tensile elongation, with the highest value of 20.8% achieved after 400/12-h treatment, representing an approximately 95% increase from the as-cast alloy's 10.66%. Conversely, the ultimate tensile strength (UTS) peaked at 138.53 MPa under the 350°C/12-h condition, an approximately 13% improvement over the as-cast state. In terms of in vitro degradation, homogenized alloys exhibited higher degradation rates than as-cast samples. Notably, the 400°C/12-h homogenization treatment resulted in the fastest corrosion rate, approximately 1.68 times higher than that of the as-cast alloy.
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SURFACE & COATINGS TECHNOLOGY
·
2026
·
IF 6.1
Xin Wang,Tianyu Zhang,Zihan Zhao,Wenlong Guo,An Du,Yong Wang,Ruina Ma,Yongzhe Fan,Xue Zhao,Xiaoming Cao
Zn-Al-Mg powder co-diffusion was performed on Q235 steel using a mechanical energy-assisted diffusion process. The resulting ZAM alloy diffusion coating comprised an inner Fe Zn layer composed of δ(FeZn 10 ) and Γ(Fe 11 Zn 40 ) phases, while the outer layer exhibited a multiphase structure distributed discontinuously in island-like or dot-like patterns on the δ-phase surface. The multiphase structure exhibits layered characteristics extending outward from the δ phase: an Al-rich layer composed of Al 2 O 3 and Fe Al phases; a Mg-rich layer interwoven with Mg Al phases, Mg Zn phases, and MgO; and an amorphous ZnO layer. The growth mechanism is investigated by this study, revealing that during the primary co-diffusion phase, a 20 μm Fe Zn layer formed first on the substrate. Subsequently, increased Al atoms combined with Fe atoms within the Fe Zn phase to form an Fe Al layer, thereby inhibiting Fe Zn layer growth. Finally, active Mg atoms form a Mg-rich layer on the surface of the Fe Al layer. Mg-rich layer combines with Al atoms to form a Mg Al phase and induces lattice distortion, thereby inhibiting Fe Al layer growth. Throughout the process, the removal of HCl exposes the Fe Zn layer and restores its normal growth. Eventually, under this dynamic mechanism, a complex, multi-phase outer structure is formed. The self-corrosion current (J corr ) of the ZAM diffusion coating (1.673 × 10 −5 A/cm 2 ) markedly lower than the ZA diffusion coating (5.499 × 10 −5 A/cm 2 ). While the ZAM diffusion coating exhibited a weight gain of 1.182 ± 0.075 mg/cm 2 after 120 h of oxidation at 500 °C, which was slightly higher than the ZA diffusion coating but considerably lower than Q235 steel.
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MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Tengchao Guo,Guoyue Xu,Shujuan Tan,Ning Liu,Jianchao Zhang,Xiangxiong Zeng,Juan Liang
The electronic properties and infrared emissivity of Zn 1-x Mg x O (x = 0, 0.0625, 0.125) were systematically investigated by using the first-principle calculation s based on density functional theory (DFT). The Zn 1-x Mg x O (x = 0, 0.0625, 0.125) powders were prepared by sol-gel method and their infrared emissivity in the wavelength of 8–14 μm was characterized. The results indicate that the infrared emissivity increases with the increase in Mg concentration, which is attributed to the reduction in conductivity and in the real part of dielectric function. Furthermore, the variation in conductivity and dielectric function has been well studied, and a reasonable method to calculate infrared emissivity of semiconductors has been established. It is expected that this method can be used for designing materials with different infrared emissivity and also applied for effectively guiding the experimental investigation.
研究领域:
材料科学
·
凝聚态物理
·
计算材料学
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功能材料
·
半导体物理
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Deping Xia,Wei Wang,Jingzhou Liu,Hualin Lin,Sheng Han
The Mg/Al hydrotalcite with different morphologies was prepared under mild conditions through a coprecipitation process. The sulfur- and phosphorus-free MA2 nanosheets were used in combination with MoDTC to improve the low load-bearing capacity and unsatisfactory tribological properties of organic molybdenum in PAO8. Especially, the 2.0 wt % MA2 nanosheets combined with 2.0 wt % MoDTC demonstrated the highest friction performances in PAO8. The results indicated that the synergistic effect between MA2 and MoDTC contributes to the formation of a stable tribofilm composed of MoS2, MgO, Al2O3, MoO3, Fe2(SO4)3, Fe2O3, and Fe3O4. This tribofilm not only could effectively protect the friction interface and provide friction-reducing and antiwear effects but also possess high film-forming rates (PB value) and load-bearing capacity.
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SUPERCONDUCTOR SCIENCE & TECHNOLOGY
·
2018
·Vol. 32
·期 1
·015015
·
IF 2.861
Zili Zhang,Min Tian,Lin Ma,Min Liu,Hongli Suo,Qiuliang Wang
We have established a novel reaction process using Mg vapour and B powder (a gas–solid reaction) to synthesize MgB2 powder with a low oxygen content. For the first time, we tried to eliminate the oxygen in Mg powder with a specially designed furnace tube that can keep the sample under an inert atmosphere throughout the entire synthesis process. The duration of heat treatment has a conspicuous effect on the phase formation of MgB2 which differs greatly from the conventional solid state reaction method. At short durations such as 1 h, unreacted B powder is ubiquitous in the sample. Full formation of MgB2 is achieved at 3 h. At longer times such as 4 h, MgB2 decomposes to form MgB4. It is deduced that the main reason for the unstable MgB2 phase formation in the gas–solid reaction is the Mg vapour present during the entire process. A feasible chemical reaction model of the novel gas–solid reaction has been established. This work provides an important foundation to obtain almost oxygen-free MgB2, which can finally resolve the mystery of the effect of oxygen on superconductivity in this system.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·Vol. 48
·期 47
·17957-17969
·
IF 7.2
Wei Zhang,Dongliang Zhao,Jun Li,Zeming Yuan,Shihai Guo,Yan Qi,Yanghuan Zhang
Ball milling the powders of Mg-based alloys with transition metal compounds is effective for improving their hydrogen storage performances. In this experiment, the alloys of La 1.7 Y 0.3 Mg 16 Ni + x wt.% TiF 3 ( x = 0–10) were prepared through mechanical milling technology. XRD , SEM , HRTEM and granulometry were used to measure the composition and microstructure of alloys. The isothermal hydrogen storage property was measured by a Sievert apparatus. The results reveal that the TiF 3 additive in ball-milled samples transforms into MgF 2 and TiH 2 after the first hydrogen absorption . Adding TiF 3 enhances the crystallinity and reduces the average particle and crystallite sizes of alloys, which is beneficial to accelerating hydriding and dehydriding kinetics. Adding 7 wt% TiF 3 into alloy decreases the dehydrogenation activation energy from 72.2 to 64.0 kJ/mol and improves the hydrogen absorption rate at low temperatures, absorbing 3.50 wt% H in 0.5 min at 323 K.
研究领域:
材料科学
·
氢能
·
金属合金
·
机械球磨
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危险品化学品经营许可证（带存储）