Journal of Asian Ceramic Societies
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2021
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IF 3.125
Weiran Zhang,Jieqin Li,Fan Zhong,Guohua Wu,Haiyun Jiang,Weili Zhang,Qilong Liu
Cobalt blue pigments, which mainly comprise CoAl2O4, are widely synthesized as nano-scale particles using the coprecipitation method. Such ultrafine powders are necessary for the ceramics industry because of their significant effect on the color of glaze and bulk tiles. In this paper, cobalt blue pigments have been prepared using the coprecipitation method and then subjected to supercritical fluid drying. The differences in their physicochemical and optical properties are characterized using a series of analysis including X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive spectrometer (EDS), and CIE-L*a*b*colorimetry analysis. The results indicate that the CoAl2O4 pigments subjected to supercritical fluid drying exhibit a fine-scale structure, a crystallite size of approximately 52 nm at 1400°C, and an excellent stability at high temperatures. They also present a vivid blue color, with improved brightness and hue than those of other cobalt blue pigments. Furthermore, this study elucidates the promising potential of supercritical fluid drying for fabricating nano-sized CoAl2O4 pigments with excellent optical and physicochemical properties.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Inorganics
·
2023
·Vol. 11
·期 9
·368
·
IF 2.9
Weiran Zhang,Ziyu Li,Guohua Wu,Wei Wu,Hailan Zeng,Haiyun Jiang,Weili Zhang,Ruomei Wu,Qiong Xue
Cobalt blue ceramic pigments mainly consisting of CoAl2O4are subject to the difficulty of color control. Here, a perspective is reported regarding research on the reasons for color change based on the control of the heat treatment and ratio of components. Macroscopically, the composition of pigment powders determines the color. Microscopically, the crystallite characters including size, cation distribution, and structure have an important effect on the color. The ingredient, structural, and color properties of the pigment powders are analyzed using thermo gravimetry–differential scanning calorimetry (TG–DSC), X-ray diffraction (XRD) measurement, Rietveld refinement, energy dispersive spectrometer (EDS), and colorimetry analysis. The color is proven to be associated with cation distribution, such as that of Co2+and Co3+. It is indicated that high heating temperature, long heating time, and a large proportion of Al3+can, respectively, induce the Co2+and Al3+in tetrahedral and octahedral sites.Keywords:cobalt blue;ceramics pigment;CoAl2O4;cation distribution;coloration
研究领域:
材料科学
·
无机化学
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产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 8
·847
·
IF 4.501
Sheng Guo,Lijuan Zhang,Meng Chen,Fawad Ahmad,Hussain Fida,Huali Zhang
Bimetallic catalysts have significantly contributed to the chemical community, especially in environmental science. In this work, a CoAl2O4spinel bimetal oxide was synthesized by a facile co-precipitation method and used for the degradation of organic pollutants through peroxymonosulfate (PMS) activation. Compared with Co3O4, the as-prepared CoAl2O4possesses a higher specific surface area and a larger pore volume, which contributes to its becoming increasingly conducive to the degradation of organic pollutants. Under optimal conditions (calcination temperature: 500 °C, catalyst: 0.1 g/L, and PMS: 0.1 g/L), the as-prepared CoAl2O4catalyst could degrade over 99% of rhodamine B (RhB) at a degradation rate of 0.048 min−1, which is 2.18 times faster than Co3O4(0.022 min−1). The presence of Cl−could enhance RhB degradation in the CoAl2O4/PMS system, while HCO3−and CO32−inhibit RhB degradation. Furthermore, the considerable reusability and universality of CoAl2O4were testified. Through quenching tests,1O2and SO4•−were identified as the primary reactive species in RhB degradation. The toxicity evaluation verified that the degraded solution exhibited lower biological toxicity than the initial RhB solution. This study provides new prospects in the design of cost-effective and stable cobalt-based catalysts and promotes the application of PMS-based advanced oxidation processes for refractory wastewater treatment.Keywords:advanced oxidation process;peroxymonosulfate;CoAl2O4;sulfate radical;activation
研究领域:
环境科学
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催化
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水处理
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产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
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IF 4.217
Qikun Wang,Yongqing Wang,Kun Liu,Jianlei Liu,Chao Wang,Yang Wang,Qibing Chang
In this study, the spherical urchin-like CoAl 2 O 4 pigment was prepared using a microemulsion-hydrothermal-precipitation (M-H-P) method. This method was used to prepare the high-performance CoAl 2 O 4 pigment, which has good dispersibility, small particle size, narrow particle size distribution, and large BET surface area. Use of this method also successfully achieved the recycling of organic solvents. SEM and TEM results show that the CoAl 2 O 4 pigment is the soft-aggregation of lamellar nanocrystals with a mean particle size of 1–1.2 μm. The urchin-like pigment exhibits better color performance than the previously reported CoAl 2 O 4 pigment. After applying the pigment on a high-temperature transparent glaze, the pigment exhibits excellent coloration, indicating its potential application in ceramic decoration and ceramic ink-jet technology. This study provides a new method for preparing high-performance powders.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
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2024
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IF 3.7
Yujie Huang,Binyao Liu,Yiwen Yang,Hao Xiao,Tao Han,Hanmei Jiang,Jiahe Li,Yong Zhou,Gaili Ke,Huichao He
Water oxidation is an endothermic and kinetics–sluggish reaction; the research of photoanodes with photothermal and cocatalytic properties is of great significance. Herein, BiVO4/CoAl2O4 film photoanodes were studied for solar water splitting through coupling spinel p-type CoAl2O4 nanoparticles on n-type BiVO4 films. Compared to the BiVO4 photoanode, better performance was observed on the BiVO4/CoAl2O4 photoanode during water oxidation. A photocurrent of 3.47 mA/cm2 was produced on the BiVO4/CoAl2O4 photoanode at 1.23 V vs RHE, which is two-fold to the BiVO4 photoanode (1.70 mA/cm2). Additionally, the BiVO4/CoAl2O4 photoanodes showed an acceptable stability for water oxidation. The BiVO4/CoAl2O4 photoanode being of higher water oxidation performance could be attributed to the presence of p–n heterojunction, cocatalytic, and photothermal effects. In specific, under the excitation of λ < 520 nm light, the holes produced in/on BiVO4 can be transferred to CoAl2O4 owing to the p–n heterojunctions of BiVO4/CoAl2O4. Meanwhile, the temperature on the BiVO4/CoAl2O4 photoanode rises quickly up to ∼53 °C under AM 1.5 G irradiation due to the photothermal property of CoAl2O4 through capturing the 520 < λ < 720 nm light. The temperature rising on the BiVO4/CoAl2O4 photoanode improves the cocatalytic activity of CoAl2O4 and modifies the wettability of BiVO4/CoAl2O4 for effective water oxidation.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
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2024
·Vol. 150
·期 8
·04024038
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IF 1.6
Jingcheng Wei,Jing Zhang,Bingyan Zhu,Tingfeng Xue,Zejia Song,Sumin Li,Liwei Pan
Activation of peroxymonosulfate (PMS) by catalysts for water treatment is very important for the sulfate radicals-based advanced oxidation technology. Constructing affordable and recyclable transition metal catalysts with high efficiency is highly desirable, but still challenging. In this study, a novel CoAl2O4/Co2O3@γ-Al2O3 catalyst for the activation of PMS was prepared with an excessive impregnation method, and its performance on the catalytic degradation of phenol in water was investigated. The composition and structure of the catalyst were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and N2 adsorption-desorption experiments. It was found that the catalyst could greatly promote the phenol mineralization in water as the total organic carbon removal increased from 4.27% to 57.64% after 60 min of reaction. The presence of Cl− inhibited the catalytic degradation of phenol in water at low concentrations, but promoted the catalytic degradation at high concentrations. However, HCO3− and CO32− revealed inhibitory effects on the catalytic degradation because they could scavenge free radicals in the system. Based on the electron spin resonance technique and the quenching experiments, O12 and SO4−· were identified to be the primary reactive species for the catalytic degradation. The CoAl2O4/Co2O3@γ-Al2O3 could be easily recovered and reused. The toxicity evaluation verified that the toxicity of the treated water was greatly decreased after the catalytic degradation. Therefore, the CoAl2O4/Co2O3@γ-Al2O3 prepared in this study could be an effective catalyst for the catalytic degradation of phenol in water by activating PMS.
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
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2025
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IF 5.8
Yuqi Zhang,Yunan Zhong,Pengfei Zhang,Yang Zheng,Chunfang Du
Halloysite nanotubes (HNTs) served as the support and aluminum source for in-situ synthesizing CoAl 2 O 4 /HNTs (CAO/HNTs), which acted as an effective catalyst to activate peroxymonosulfate (PMS) for degrading tetracycline hydrochloride (TC). To achieve the optimal removal performance, various parameters were optimized. The final CAO/HNTs demonstrated a high degradation efficiency of 88 % toward TC within 40 min, which was 1.69 times as high as that of pure CAO. The existence of HNTs made CAO highly dispersed, increasing the number of exposed active sites and the contact opportunities between CAO and TC molecules, which enabled CAO to participate in the reaction more effectively and thus improved the degradation efficiency. Additionally, the formation of Co-O-Al bonds facilitated the growth of CAO into a three-dimensional (3D) spherical structure with more active sites other than the tetrahedral structure on HNTs. In the CAO/HNTs/PMS system, O 2 •– and 1 O 2 contributed mostly to the catalytic process. This work not only provides a novel catalyst for the treatment of antibiotic pollution, but also offers an innovative strategy for fabricating functional materials on the basis of chemical composition and morphology characteristics of natural minerals.
研究领域:
环境科学
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纳米技术
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催化
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材料科学
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化学工程
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
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.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Yihui Li,Ziang Zhao,Min Zhao,Hejun Zhu,Xinzheng Ma,Zheng Li,Wei Lu,Xingkun Chen,Linbin Ying,Ronghe Lin,Yu Meng,Yuan Lyu,Li Yan,Yunjie Ding
Promotional effects of oxygen vacancies of spinel catalysts in CO 2 hydrogenation are reported in early works, but the mechanistic origins remain elusive. Here, CoAl 2 O 4 spinels with varying numbers of oxygen vacancies are deliberately designed by a sol-gel method and different post-treatments. By combining catalytic testing, advanced electron microscopic and spectroscopic characterizations, and computational studies, the unusual oxygen vacancy-dependent catalytic behaviors are rationalized. Our work reveals that i) perfect spinel crystals possessing least oxygen vacancies can effectively constrain the Co 2+ species at working conditions that are less active but selective to CO; and ii) vacancy-rich spinels promote both H 2 and CO 2 activations and COOH* formation, explaining the higher hydrogenation activity, but overwhelming vacancies cause Co 2+ reduction and promote direct CO 2 * dissociation to CO* and deep hydrogenation to CH 4 . These molecular-level understandings reinforce the idea of proper design of oxygen vacancies to achieve activity-selectivity balance.
研究领域:
材料科学
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催化化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2026
·
IF 8.6
Fanqi Meng,Hui Zhang,Xia Feng,Hanying Yao,Zihang Jiao,Yi Hou,Zhi Song,Lixi Wang
SiC w /CoAl 2 O 4 fibrous membranes integrate Vis–NIR compatibility and microwave absorption. • CoAl 2 O 4 spinel enables vegetation-like green reflection, red-edge behavior, and thermal-response similarity to natural leaves. • SiCw and SiC w /CoAl 2 O 4 interfaces improve dielectric loss and impedance matching. • S15T800 achieves an RLmin of −56.60 dB, an EAB of 7.12 GHz, and an RCS reduction of 18.69 dB m 2 . The increasing use of multispectral detection requires protective materials that combine vegetation-matching optical response with microwave attenuation. Herein, SiC w /CoAl 2 O 4 (SC) composite fibrous membranes were prepared by electrospinning and calcination. CoAl 2 O 4 provided a stable green color and Vis–NIR reflectance behavior close to natural leaves, while SiC w introduced dielectric loss and conductive pathways for microwave dissipation. The SiC w /CoAl 2 O 4 heterointerfaces further promoted interfacial polarization, and the interwoven fibrous network assisted wave scattering and propagation. By optimizing the SiC w loading and calcination temperature, S15T800 achieved the best overall performance, with a minimum reflection loss of −56.60 dB and an effective absorption bandwidth of 7.12 GHz at 1.9 mm. RCS simulations also showed an RCS reduction of 18.69 dB m 2 . This work offers a feasible route for designing lightweight multispectral-compatible microwave absorbing membranes.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·
IF 12.2
Yuyao Zhang,Dingren Ma,Yonghyeon Kim,Claire Chouinard,Kwan Lam Yip,Jae-Hong Kim
Catalytic membranes for persulfate-based advanced oxidation processes (AOPs) are gaining prominence in wastewater treatment due to their high reactivity and application potential. However, their real-world deployment faces two key limitations: (i) catalyst deactivation from leaching and site poisoning in harsh reactive conditions and (ii) nonselective oxidation causing excessive oxidant use due to background organic matter interference. To address these challenges, we developed a glazed CoAl2O4 spinel catalyst with an amorphous surface through high-temperature quenching. This amorphized surface structure eliminates grain boundaries, significantly enhancing resistance to oxidative degradation and minimizing cobalt catalyst leaching (∼20 ppb). More importantly, the glazed surface interface promotes a nonradical electron-transfer mechanism from pollutants to persulfate, enabling selective degradation of persistent micropollutants such as 1,4-dioxane. Structural characterization and electrochemical analysis reveal that the amorphous interface introduces abundant oxygen vacancies and suppresses radical generation, supporting direct pollutant-to-oxidant electron transfer. Membrane tests confirm high flux operation, excellent pollutant selectivity, and long-term stability, positioning this catalyst as a next-generation platform for selective, stable, and sustainable AOP-based water treatment.
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2026
·
IF 5.1
Meijuan Ding,Mei Li,Ziyu Li,Jingyi Nie,Chaoqi Ding,Aohui Ping,Zhiliang Jin
The rapid recombination of carriers and the low efficiency of solar energy utilization remain major challenges in the field of hydrogen evolution. This study utilised coal tar pitch as a carbon source to synthesise nanocarbon spheres (CS), which were then employed to modify CoAl2O4 nanoblossoms (CAO) and hexagonal CdS, thereby constructing a highly active composite photocatalyst. Activity testing indicates that under visible light irradiation, the photocatalytic hydrogen evolution rate of the 20% CAO–CdS–CS composite material reached a maximum of 43.1 mmol g−1 h−1 within 5 h. Furthermore, its apparent quantum yield (AQY) at 475 nm was 2.5%. The successful construction of this composite material not only significantly enhanced hydrogen evolution performance but also effectively broadened the catalyst's photoresponsive range into the near-infrared region. Characterization and band structure analysis reveal that CAO–CdS forms a Z-scheme heterojunction. CS, acting as a co-catalyst, not only provides abundant hydrogen evolution active sites for the reaction system but also accelerates charge transfer, playing a pivotal role in the photocatalytic process. This study provides valuable insights into the application of coal-based nanocarbon materials in the field of photocatalytic hydrogen evolution.
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DOI
高影响因子
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