MINERALS ENGINEERING
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2025
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IF 5
Hao Fu,Xuesong Jiang,Xiaotian Chen,Zhenyi Hu,Jifei Sun,Zongrong Zhou,Ling Wang,Boyuan Ban,Jian Chen
Al is one of the most difficult to remove impurities from quartz. Even with HF, only a limited removal efficiency was demonstrated. This study proposes a novel and environmentally friendly strategy centered on a combined process of ball milling, Na 2 CO 3 roasting, fluorine-free acid leaching, and chlorination roasting. The core innovation lies in the strategic induction of a consecutive and reversible phase transformation cycle (α-quartz → cristobalite → α-quartz), which serves as an internal grain refiner to achieve continuous microstructure refinement, thereby constructing abundant fast pathways for impurity migration. A comprehensive XRD analysis was introduced to observe the microstructure evolution. The results indicate that Na 2 CO 3 promotes the phase transformation from α-quartz into cristobalite at a relatively low temperature, while chlorination roasting facilitates the reverse transformation back to α-quartz. It revealed that these two distinct phase transformations not only disrupt the crystal integrity but also lead to significant microstructure refinement accompanied by abundant lattice defects. Through these defects, Al impurities rapidly migrate to the quartz particle surface, where they react with the acid solution and HCl gas, enabling efficient removal. Under the optimal process, the Al removal rate reached 90.5 %, the total impurity removal rate attained 98 %, and the quartz purity increased from 99.683 wt% to 99.994 wt%. This work highlights the crucial role of reversible phase transformation-induced grain refinement as an efficient strategy for lattice impurity removal, offering a green and high-performance alternative to HF-based purification with demonstrated advantages in environmental safety, energy efficiency, and product yield.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 12
·e70119
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IF 3.8
Shaobo Yang,Xian Liu,Chenxi Liang,Jiali Li,Yujie Ma,Sijie Kou,Juanli Deng,Bo Chen,Shangwu Fan
The study investigated the hydrothermal corrosion behavior of Y 2 O 3 -Al 2 O 3 -SiO 2 (YAS) and CaO-Y 2 O 3 -Al 2 O 3 -SiO 2 (CYAS) glass interlayers in SiC/SiC composite joints under simulated pressurized water reactor (PWR) conditions and evaluated their effects on mechanical performance. The corrosion rate of the YAS joint was ∼2.7 mg/(cm 2 ·day), primarily due to the rapid dissolution of SiO 2 , which triggered pitting corrosion and void formation. While the Y 2 Si 2 O 7 exhibited good stability, degradation of the glass network caused the hydrolysis of Al species, forming stable AlO(OH) corrosion products. These processes severely damaged the structural integrity, reducing shear strength to ∼6 ± 2 MPa after 15 days, making it unsuitable for application. In contrast, the CYAS joint showed superior corrosion resistance, with a corrosion rate of ∼0.16 mg/(cm 2 ·day), only 2.2% of the YAS joint. The CYAS joint maintained structural integrity and interface bonding. During corrosion, Y 2 Si 2 O 7 crystals formed, while a layer of corrosion intermediates covered and eventually transformed into AlO(OH) particles. After 25 days, shear strength remained at 26 ± 2 MPa, still satisfying service requirements. The hydrothermal corrosion mechanism of YAS-based glasses basically involved the breakdown of the glass network and formation of stable products, including Y 2 Si 2 O 7 and AlO(OH).
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Journal of Magnesium and Alloys
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2020
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IF 7.115
Xin Wang,Chuan Jing,Yuxiang Chen,Xiushuang Wang,Gang Zhao,Xing Zhang,Liang Wu,Xiaoying Liu,Biqin Dong,Yuxin Zhang
Magnesium alloys, the advanced lightweight structural materials, have been successfully applied in the manufacturing field. Unfortunately, their poor corrosion resistance restrains the potential wide applications. In this work, anti-corrosion coatings were fabricated via the in-situ growth of the corrosion inhibitors intercalated magnesium-aluminum layered double hydroxide (Mg–Al LDH) on AZ31 magnesium alloy and then post-sealing it by a super-hydrophobic coating. SEM, XRD, EDS, FTIR, XPS and contact angle test were conducted to analyze physical/chemical features of these coatings. Potentiodynamic polarization curves and electrochemical impedance spectroscopy were recorded to assess the anti-corrosion performance of prepared coatings. Surprisingly, Mg–Al LDH with molybdate intercalation and lauric acid modification achieves the excellent corrosion inhibition performance (99.99%) due to the multicomponent synergistic effect such as the physical protection of Mg–Al LDH, the corrosion inhibition of molybdate and super-hydrophobic properties of lauric acid. This work presents a scientific perspective and novel design philosophy to fabricate the efficient anti-corrosion coating to protect magnesium alloys and then expand their potential applications in other field.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
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IF 3.442
Jun Wang,Xiaofang Lei,Cong Huang,Lian Xue,Wei Cheng,Qiang Wu
Herein, a novel MoO 3 /Zn–Al LDHs composite photocatalyst was successfully prepared. Morphology, chemical composition, and photoelectrochemical properties of the prepared catalyst were explored by different characterization methods, including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), Brunauer Emmett-Teller (BET), UV–Vis diffuse reflectance spectrometry (DRS) and Electron Spin Resonance (ESR). Using tetracycline as a target pollutant, the photocatalytic activity of MoO 3 (10 wt%)/Zn–Al LDHs composite was tested by photodegradation of tetracycline under visible light irradiation. The experimental results indicate that the MoO 3 (10 wt%)/Zn–Al LDHs composite exhibited higher photocatalytic removal efficiency than pure Zn–Al LDHs and MoO 3 . The removal efficiency of TC in 60 min could reach 90.5%. It was confirmed that the optimal conditions were a catalyst dosage of 1.0 g/L, an initial pH of 9, and an initial concentration of TC of 40 mg/L. In addition, a possible mechanism for the photodegradation of TC with MoO 3 (10 wt%)/Zn–Al LDHs composite was proposed. The introduction of MoO 3 facilitates the separation of electron-hole pairs. It could be seen that the MoO 3 (10 wt%)/Zn–Al LDHs composite has great application prospects for the treatment of antibiotic wastewater.
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Frontiers in Physics
·
2023
·
IF 3.1
Zhang Lan,Yang Shuquan,Xiao Meihui,Chen Lin,Sun Jun,Ding Jianjun,Li Xiaoxiao,Gong Yi,Zheng Kang,Zhang Xian,Tian Xingyou
In this study, the performance of low-temperature sintered Bi-B-Si-Zn-Al glass/SiC composites by vacuum hot-press sintering between 700°C and 1000°C was investigated. The specimen had a relatively preferable density of 95.5% and thermal conductivity of 8.660 Wm−1K−1 after sintering at 900°C for 2 h. The dielectric constant and dielectric loss tangle of the composite were 32.9 and 0.57 at 20 GHz, respectively. The XRD analysis indicated the formation of Bi, Zn and ZnAl2O4 crystals, and the microstructure showed the low contact angle of the glass and SiC grain. Such low-temperature sintered SiC ceramic may have a promising application in the electronic field.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Min Zhao,Ziang Zhao,Yuan Lyu,Wei Lu,Ming Jin,Tao Liu,Hejun Zhu,Yunjie Ding
Suitable metal–support interaction is of great significance for the supported Fischer–Tropsch catalyst. Herein, we synthesized a series of porous spinel MAl2O4 (M = Co, Mg, Zn) together with Al2O3, via a sol–gel method and used them as supports for the Co-based Fischer–Tropsch synthesis (FTS) catalyst to investigate the influence of metal–support interaction on Co dispersity, reducibility, and catalytic performance. The catalytic performance showed that 15Co/CoAl2O4 had the highest activity and C5+ selectivity, as well as favorable stability during 1000 h lifetime testing. The catalysts were characterized by physisorption, chemisorption, HRTEM, XPS, and TPSR. The results indicated that 15Co/CoAl2O4 showed weaker metal–support interaction than 15Co/MgAl2O4 and 15Co/Al2O3, which was considered as the key factor for its higher reducibility and CO dissociation ability, contributing to the higher CO conversion. The higher Co dispersity on CoAl2O4 resulted from the smaller particle size of Co species on CoAl2O4, contributing to the higher activity of 15Co/CoAl2O4 than that of 15Co/ZnAl2O4. The higher C5+ selectivity on 15Co/CoAl2O4 and 15Co/ZnAl2O4 than that on 15Co/MgAl2O4 and 15Co/Al2O3 was verified to benefit from the appropriate H2/CO adsorption ability, which was significantly affected by metal–support interaction.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Zhaojie Fang,Zetong Liu,Joe Yeang Cheah,Xinyi Guan,Huijuan Li,Tao Jiang,Shengping Wang,Xinbin Ma
A novel core–shell CaO based adsorbent with Al-Zr co-modification was synthesized via a facile one-pot calcination method. The CO 2 capture capacity and long-term stability of the adsorbents with different Ca/Al/Zr molar ratios were investigated. The co-doping strategy significantly enhanced the CO 2 capture capacity of the calcium-based adsorbents. Specifically, the optimized Ca24Al1Zr0.3 adsorbent exhibited excellent CO 2 adsorption performance in long-term adsorption–desorption cycles, with the CO 2 capacity of 0.53 g-CO 2 /g-ads after 40 cycles. The synergistic effects of Al-Zr co-doping were analyzed from a microstructural perspective. The core–shell Ca24Al1Zr0.3 adsorbent with a CaZrO 3 outer shell featured minimized particle size, abundant mesoporous and macroporous structures, and uniformly distributed doping components. Under the combined effects of structural modification and metal doping, it manifested enhanced CO 2 capture capacity. Based on the CO 2 adsorption mechanism of CaO, this study revealed that Al-Zr co-doping promotes oxygen vacancy generation and improves CO 2 adsorption performance. The Ca24Al1Zr0.3 adsorbent demonstrated the highest oxygen vacancy content and the most pronounced positive shift in Ca 2p binding energy. This shift enhanced electron-donating capability of calcium, effectively facilitating O 2− migration and CO 2 diffusion. Furthermore, the Ca24Al1Zr0.3 adsorbent exhibited superior carbonation reaction kinetics during long-term cyclic operation.
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Catalysis Science & Technology
·
2024
·Vol. 14
·期 3
·735-745
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IF 4.4
Xueting Song,Haifeng Yang,Chenghua Zhang,Guizhi Zhang,Hong Wu,Youzhou He,Min Fu,Xingyan Liu,Siqi Li,Siping Wei
Synergistically modulating electron distribution between metal nodes in metal–organic frameworks (MOFs) is an effective strategy to improve the electrocatalytic performance of MOFs. Herein, a special bimetallic MOF composite (Al0.35/Ru0.15-TCPP-CNTs) was constructed by introducing highly dispersed Ru and Al co-existing in the MOF metal clusters and combining them with conductive carboxylic multi-walled carbon nanotubes (CNTs). Notably, the catalyst exhibited excellent hydrogen evolution reaction (HER) performance, with an overpotential of as low as 32 mV at a current density of 10 mA cm−2 in acidic media, comparable to commercial Pt/C. Experimental results and density functional theory (DFT) calculations proved that a reasonable proportion of Al/Ru bimetallic clusters in MOFs and the loaded CNTs induced charge redistribution and cooperative electronic coupling, which not only optimized the adsorption energy of H intermediates (ΔGH*) and produced a possible hydrogen spillover effect, but also increased the specific surface area and facilitated electron/mass transfer. This work may provide an improved method and research idea for the study of MOF electrocatalysts at the atomic level.
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INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
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2025
·
IF 2.5
Yuge Liu,Zhiguo Li,Yongmei Jia
The fast detection of environmental contaminants catechol (CC) and hydroquinone (HQ) is of great importance to public health. In this research, a composite was firstly synthesised by a pre-exfoliation method, the components of which were Ni-Al-LDH and reduced graphene (rGO). This material was then utilised in the development of a highly sensitive biosensor for determining CC and HQ. The construction procedure involved modification of glassy carbon electrode (GCE) by the composite and laccase (LAC). Tests conducted by electrochemical methods showed the addition of laccase can greatly improve the response signal of electrochemical measurements on the composite modified GCE to CC and HQ. The electrochemical tests were performed by utilising 0.1 mol/L phosphate-buffer. When separately detected, the detecting linear range for CC by the biosensor was 0.009–0.58 and 0.95–4.4 mmol/L. When it comes to HQ, the range was 0.009–0.57 and 0.95–4.4 mmol/L on the composite/enzyme modified electrode. When the biosensor was used for detecting CC and HQ together, the linear ranges were both 0.019–0.56 and 1.0–4.4 mmol/L. The detection limits calculated for simultaneous detection were 0.75 and 0.47 μmol/L, respectively. The sensor also possessed excellent sensitivity, selectivity and long stability. For applicability of the biosensor, it was used in analysing the two substrates in real water samples, and the recoveries were acceptable.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2026
·
IF 4.5
Yongtai Li,Yuanting Du,Yushan Jia,Ruixi Yang,Weijun Shan,Zhenning Lou,Haibiao Yu,Ying Xiong
Hollow coral-like MCM-41-C was successfully prepared by adjust ethanol dosage. • Hollow coral-like 7wt%Al-MCM-41-C with rich weak acid site was prepared by impregnation. • Butene yield was 92.26% for 7wt%Al-MCM-41-C catalyst (300 °C, 90 min). • Due to hollow coral-like structure, 7wt%Al-MCM-41-C exhibits high catalytic stability. In this paper, the hollow coral-like ordered mesoporous MCM-41-C zeolites were synthesized by hydrothermal method, and their synthesis conditions were thoroughly investigated. Then, x wt%Al-MCM-41-C catalysts feature with hollow coral-like morphology were prepared by impregnation method, and used for the catalytic conversion of γ-valerolactone (GVL) to butene. The results showed that the introduction of Al species not only did not destroy the original special microscopic morphological structure of the MCM-41-C, but also co-existed on the surface and skeleton of the catalyst, resulting in a large number of weak acid sites. The optimal 7wt%Al-MCM-41-C catalyst has a specific surface area of 708.56 m 2 g −1 . The content of weak acid was 0.7262 mmol g −1 . At 300 °C, the GVL conversion and butene yield over the catalyst can reach 99.10% and 92.26%, respectively, within just 90 min of reaction. Meanwhile, the 7 wt%Al-MCM-41-C catalysts also demonstrated excellent catalytic cycle stability, and the butene yield remained above 90% after the 4th cycle. Download: Download high-res image (330KB) Download: Download full-size image
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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2026
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IF 3.1
Afridi Muhammad Naveed,Adil Sawaira,Fatima Rida,Khan Fazal Maula,Ali Imran,Mir Irshad Ahmad,Miao Baoji,Lee Kang Hoon
Heavy metal contamination in industrial wastewater remains a critical global environmental concern. In this study, an Al/Mg/Zr-MOF (AMZ-MOF) was synthesized via a solvothermal method and systematically evaluated for Cr (VI) removal from aqueous solutions. Comparative analysis demonstrated that AMZ-MOF exhibited superior Cr (VI) removal efficiency relative to pristine Zr-MOF, Mg/Zr-MOF, and Al/Zr-MOF. The synthesized AMZ-MOF composite was subjected to comprehensive characterization using FESEM, TEM, XRD, BET, FTIR, and XPS analyses. The study systematically investigated the influence of key operational parameters, including contact time, temperature, pH, and initial Cr (VI) concentration, on the composite’s sorption behavior. AMZ-MOF demonstrated exceptional performance, achieving a maximum Cr (VI) sorption capacity of 185.2 mg/g. Remarkably, the sorbent exhibited rapid initial uptake kinetics, reaching adsorption equilibrium within 120 min. Mechanistic insight was gained through adsorption isotherm and kinetic modeling, revealing that the process is best described by the Langmuir isotherm and the Pseudo-Second-Order kinetic model, suggesting monolayer adsorption onto a heterogeneous surface and chemisorption as the rate-limiting step, respectively. Further FTIR and XPS analyses corroborated the proposed sorption mechanism, clarifying the key functional groups and surface interactions involved in Cr (VI) removal. The proposed adsorbent demonstrated excellent reusability over five adsorption–desorption cycles, underscoring its stability and practical potential for Cr (VI) remediation.
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PHYSICA B-CONDENSED MATTER
·
2026
·
IF 3.2
Weigang Zhang,Jialun Zhang,Guojuan Xu,Qianfeng Zhang
A high performance infrared and visible light compatible stealth coating was prepared by a simple method. • The leaf-mimetic PU/Al-ZnO composite coatings with yellow-green color and green peak characteristics. • The PU/Al-ZnO composite coating exhibits a prominent green peak at 544 nm, resembling that of green vegetation. • The PU/Al-ZnO composite coating exhibits excellent infrared stealth performance and mechanical properties. With the rapid development of various reconnaissance equipment targeting land-based equipment, traditional green camouflage coatings and low infrared emissivity camouflage coatings have become inadequate to meet practical needs. Developing green-based low infrared emissivity coatings with distinct green peak characteristics is an effective approach to address the aforementioned issues. In this study, using polyurethane resin as the matrix, yellow-blue polyurethane color paste as the colorant, flaky Al powder and zinc oxide (ZnO) as low emissivity functional fillers, a systematic regulation and optimization were carried out using the variable control method for the washing and drying duration of Al powder, the content of low emissivity fillers (Al powder + ZnO), the ratio of ZnO to Al powder, and the total amount of pigment and filler based on the comprehensive performance of the coating. The results show that after washing and drying the Al powder with ethanol for 3.5 h, the prepared coating exhibits a yellow-green appearance that matches green leaves. It has a characteristic reflection peak at 544 nm similar to that of green vegetation, and the coating has the lowest emissivity. Under the optimal washing and drying duration conditions for Al powder, the emissivity of the coating can be adjusted within the range of 0.738 to 0.807 by regulating the amount of low emissivity filler, while ensuring that the coating exhibits distinct yellow-green characteristics. When the amount of low emissivity filler is 16 wt% and the ratio of ZnO to Al powder is 6:4, the infrared emissivity of the coating reaches its lowest at 0.738, while maintaining distinct green peaks and yellow-green appearance characteristics. Finally, when the total amount of pigment and filler is adjusted to 40 wt%, the emissivity of the coating is the lowest, the yellow-green characteristics are prominent, and it has excellent mechanical properties.
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