SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Cong Jiang,Maohong Fan,Ge Gao,Wufeng Jiang,Xiaoshan Li,Cong Luo,Liqi Zhang,Fan Wu
In order to alleviate the intensive energy demand of amine-based post-combustion carbon capture technology, metal oxyhydroxide AlOOH of nanoscale was synthesized through the hydrothermal method and applied to accelerate the CO 2 desorption rate and reduce the regeneration heat duty of aqueous monoethanolamine (MEA) solution for the first time. Results showed that the use of AlOOH could accelerate the desorption rate by up to 560% and increase the desorption amount by 251%. By comparing the performance between AlOOH and Al 2 O 3 , it can be found that the presence of extra hydroxyl groups is 20.6% more efficient in catalyzing CO 2 desorption. According to a simplified heat transfer model created in this work, AlOOH could reduce the heat duty by 17% with only 0.1 wt% loading, which exhibited the highest performance cost ratio among related literature. In addition, the cyclic stability of AlOOH was confirmed through various characterization methods, including XRD, FT-IR, SEM, and N 2 adsorption–desorption. More importantly, a possible catalytic mechanism of AlOOH was discussed and proved where it could change reaction pathways in different CO 2 loading regions. This work reveals a promising research direction towards cost-efficient and high-performance metal oxyhydroxide catalysts in the catalytic amine regeneration field to approach the net-zero carbon emission goal.
研究领域:
材料科学
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环境工程
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Zhang-Ao Shi,Jia-Min Wu,Chen Mao,Li-Xiang Fu,Shou-Lei Yang,Jing-Xian Zhang,Yu-Sheng Shi
Vat Photopolymerization (VPP) technology is expected to address the challenges of preparing high-strength, precise, and complex SiC ceramics. However, the poor printability of SiC powders and the low strength of the resulting SiC ceramics remain significant obstacles. To overcome these issues, this study proposes a SiO 2 /AlOOH double-coating method for modifying SiC powders. The effects of AlOOH content in the double coating on the properties of SiC powders, slurries, and ceramics were investigated. Additionally, the impact of sintering additives on the densification behavior and mechanical properties of SiC ceramics was examined. The results indicated that increasing the AlOOH content in the double coating decreased the UV absorption of the powders and increased the curing depth of the slurries, but also increased the viscosity of the pastes. Moreover, while increasing the AlOOH content in the double coating improved the densification and flexural strength of the ceramics, the effect was significantly less compared to optimizing the sintering additive. Using SiO 2 /AlOOH double-coated SiC powders containing 2.5 wt% AlOOH and 10 wt% Al 2 O 3 -Y 2 O 3 -MgO (mass ratio 1:8:1) sintering additives, SiC ceramics were prepared with a relative density of 91.1 ± 3.5 %, a Vickers hardness of 1685.6 ± 86.4 HV, and a flexural strength of 281.7 ± 14.4 MPa, much higher than that of other SiC ceramic prepared using the same process. This represents the highest flexural strength of SiC ceramics prepared by VPP technology to date, providing a new method for the preparation of high-strength SiC ceramics via VPP.
研究领域:
材料科学
·
陶瓷加工
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Zhang Siyang,Khan Iltaf,Qin Xiaohong,Qi Kezhen,Liu Ying,Bai Shuchong
In this work, the highly efficient and low-cost Ag-AgBr/AlOOH plasmonic photocatalyst is successfully prepared via a simple and mild wet-chemical process and used for degrading high concentration methylene blue (MB) and tetracycline hydrochloride (TCH). The optimized 6-Ag-AgBr/AlOOH sample showed a 79% decomposition of TCH in 2 h, which is almost two times higher than that of bare AgBr (37%). For degrading MB, the photocatalytic activity of 6-Ag-AgBr/AlOOH (decomposing 84% in 2 h) showed a large enhancement as compared to bare AgBr (only 57%). The TEM, HRTEM, XRD, DRS, and XPS characterization results confirm that Ag-AgBr is a composite catalyst formed by loading Ag nanoparticles onto AgBr surfaces and then loaded on to AlOOH. The possible mechanism proposed is that •O2- and •OH radicals produced under sun light are the main active species for degrading MB and TCH. It is hoped that this work will open a new gateway to the synthesis of highly efficient and low-cost Ag-AgBr/AlOOH plasmonic photocatalysts for degrading organic pollutants.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Wen Tao,Hong Zhong,Xiangbo Pan,Peng Wang,Haiying Wang,Lei Huang
In this paper, Ce-AlOOH were investigated to develop as an adsorbent for removing fluoride. Oxalic acid was selected as an effectively modified reagent to improve the performance of adsorption. Cerium existed in the form of CeO 2 and kept good stability during the adsorption process through XRD, TEM, BET, Raman, and Infrared spectra. The adsorption capacity could be improved with the addition of cerium (62.8 mg/g). Specially, the oxalic acid modification significantly promoted the adsorption capacity to 90 mg/g. There adsorption isotherm and kinetics were estimated independently. These adsorption behaviors were in accordance with the Freundlich model and pseudo-second-order model, indicating that chemisorption was the rate-determining step. the obtained adsorbents all exhibited good recycling performance using oxalic acid as the regeneration reagent. The species of tetravalent cerium was the important adsorption sites. The mechanism was carefully explored by XPS analysis. The fluoride adsorption process can be ascribed to the combined effect of the electrostatic action, surface coordination, and ion exchange between M−OH and F − . Furthermore, modification of oxalic acid exhibited a new easier way to quickly increase M−OH content, which contributed to the dominated adsorption sites.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Bolun Sun,Xiang Li,Rui Zhao,Mingying Yin,Zongxin Wang,Ziqiao Jiang,Ce Wang
The hierarchical aminated polyacrylonitrile (PAN)/γ-AlOOH electrospun composite nanofibers were prepared by a combination of electrospinning process, chemical modification and hydrothermal reaction. The obtained membranes were carefully examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The hierarchical aminated PAN/γ-AlOOH composite nanofibers were proved to be good adsorbents toward Pb(II), Cu(II) and Cd(II) ions in aqueous solution. The adsorption process of the Pb(II), Cu(II) and Cd(II) ions could be described by Langmuir isotherm model and kinetics were found to follow the pseudo-second-order rate equation. The maximum adsorption capacities of hierarchical aminated PAN/γ-AlOOH electrospun composite nanofibers for Pb(II), Cu(II) and Cd(II) were 180.83 mg/g, 48.68 mg/g and 114.94 mg/g, respectively. The results proved that the synergetic adsorption effect between amine groups and γ-AlOOH crystals contributed to the high adsorption activity of the hierarchical aminated PAN/γ-AlOOH composite nanofibers. The obtained membranes can be potentially applied in heavy metal ions removal from wastewater effluents.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Wenchao Shangguan,Guoqiang Li,Shidi Gui,Xiaodong Zhang,Sugang Meng,Shifu Chen,Yingxuan Li
Separating photoexcited holes in metallic nanostructure to drive H 2 O oxidation reaction to balance the CO 2 photoreduction reaction is highly desirable, but challenging. The bottleneck lies in the sluggish kinetics of both photoexcited hole transfer and H 2 O oxidation. Herein, this work demonstrates that the in situ reconstruction of n -type wide-bandgap AlOOH-supported Au nanoparticle heterogeneous photocatalyst, triggered by thermal and photothermal cooperative effect during photocatalytic reactions, facilitates the efficient CO 2 photoreduction through optimizing the Au 5 d -band holes separation and H 2 O activation. In situ and ex situ characterizations evidence restructuring at interfaces to form an ultrathin γ-Al 2 O 3 nanolayer (≈2 nm thickness), which optimizes the energy band structure and promotes spontaneous transfer of photoexcited Au 5 d -band holes to the valence band of AlOOH, and prolongs the lifetime of electrons available for CO 2 reduction on Au. Furthermore, hydroxyl vacancies generated during restructuring process are demonstrated to promote H 2 O adsorption and lower the energy barrier for O 2 formation, supplying adequate protons for CO 2 protonation reduction and thereby boosting CO 2 photoreduction efficiency. This study offers valuable insights into the underlying mechanisms of utilizing n -type semiconductors to separate photoexcited d -band holes in metal nanoparticles.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 1
·407-413
·
IF 1.354
Zhu Yuanna,Wang Jianrong,Wang Yingzi,Song Xueling,Xu Yanan,Yang Ping
Fe3O4@AlOOH adsorbent with high efficient adsorption capacity was successfully synthesized by controlling the hydrolysis rate for aluminum isopropoxide (AIP) and introducing inductive agent thioglycolic acid (TGA). Al(OH)3-TGA clusters played a key role
in the formation of Fe3O4@AlOOH adsorbent with lamellar structure. Morphology characterization revealed that magnetic Fe3O4 nanoparticles were uniformly deposited on the surface of AlOOH. The lamellar structure of AlOOH and the strong magnetic intensity
of Fe3O4 were helpful for its rapid separation from solution under external magnetic field. Hence, the sample could be regenerated easily and reused in the later adsorption–desorption cycles. The as-prepared sample exhibited ultrafast adsorption rate and high adsorption
capacity in the removal of Congo Red (CR) from aqueous solution. The maximum adsorption capacity of Fe3O4@AlOOH towards CR was 280.90 mg/g and CR was completely removed from the aqueous solution within 60 seconds. The adsorption process was well described by the Langmuir
isotherm model. Electrostatic adsorption was considered as the main adsorption mechanism. Moreover, Fe3O4@AlOOH sample tended to adsorb CR more effectively in the neutral and acidic solution.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
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2020
·
IF 4.825
Zhiyuan Liu,Jingpeng Niu,Weimin Long,Bing Cui,Kun Song,Fan Dong,Dong Xu
Indoor formaldehyde from substandard furniture and decorative materials seriously endangers human health. How to remove effectively indoor formaldehyde with low concentration at room temperature is a challenging problem. Using a MnO2/AlOOH composite by the MnO2 modification as a catalyst provides an effective approach to solve this challenge. Here, a new type of MnO2/AlOOH composite catalyst with high ability to remove indoor low-concentration formaldehyde was prepared by redox reaction at room temperature. A MnO2/AlOOH composite with a homogeneous dispersion of MnO2 has high specific surface area and a large amount of surface hydroxyl (−OH) which plays a major role in the adsorption of formaldehyde. A partially crystalline structure was observed in the composite, which contains multivalent Mn ions and a large number of vacancy defects. The surface −OH of composite shows strong oxidation activity through the charge exchange of multivalent Mn ions and vacancy defects. The composite has a higher ability to remove indoor low-concentration formaldehyde compared to the birnessite MnO2 at room temperature. This study proposes a new idea for the improvement of catalytic performance in the structure and composition of the catalyst.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yongjin Wang,Zhipeng Zhou,Xiaoxia Zhang,Junjie Liao,Jiancheng Wang,Weiren Bao,Liping Chang
The preparation of a Cu-based sorbent supported by cost-effective AlOOH is proposed. A Cu-based sorbent for thiophene removal from coke oven gas was synthesized via coprecipitation, and the effect of AlOOH addition on the dispersion of activated Cu species and desulfurization properties was investigated. At an AlOOH content of 25%, smaller and more highly dispersed Cu grains, along with ZnO crystalline phases, were present on the surface of the Cu-based sorbent. The enhanced Cu-ZnO interaction contributed to the superior desulfurization performance (Qb-thiophene = 30.43 mg/g). The incorporation of an appropriate amount of AlOOH into the binary system during synthesis produces a highly active sorbent with superior Cu dispersion and smaller Cu grains, thereby fulfilling the requirements of industrial applications at a lower production cost.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 42
·33155-33162
·
IF 3.84
Xueling Song,Ping Yang,Changchao Jia,Ling Chen,Katarzyna Matras-Postolek
Urchin-like AlOOH microspheres with large specific surface area were successfully synthesized by a one-pot chemical induced solvothermal method. Thioglycolic acid (TGA) was used as inductive agent to fabricate AlOOH with various morphologies. Al(OH)3–TGA clusters played an important role in the formation of AlOOH with unique spherical morphology. The preparation parameters such as reaction time, reaction temperature, and the volume ratio of deionized water to ethanol influenced the formation of AlOOH microspheres. Urchin-like AlOOH microspheres with uniform morphology were created through reaction for 20 h at either 150 or 220 °C. The specific surface area and pore-size distribution of urchin-like AlOOH were determined by N2 absorption–desorption measurement, indicating that the AlOOH microspheres exhibited porous properties and a large specific surface area of 319.15 m2 g−1. A possible formation mechanism for the urchin-like AlOOH microspheres was proposed. Urchin-like AlOOH spheres prepared at 220 °C for 20 h revealed high efficiency for the removal of Congo red pollutant from waste water compared with other samples.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhijun Li,Honghong Li,Dundong Yuan,Leipeng Leng,Mingyang Zhang,Minghui Di,J. Hugh Horton,Jun Wang,Litao Sun,Weiwei Sun
Exploring the interaction between metal and support is of great importance in enhancing the catalytic performance and deepening the mechanistic understanding of single atom catalysis. Here we describe a photoinduction method to construct atomically dispersed palladium atoms supported over defect-containing boehmite (γ-AlOOH) nanoleaf with a palladium loading of 0.32 wt%. The existence of singly dispersed palladium atoms is confirmed by spherical aberration correction electron microscopy, extended X-ray absorption fine structure measurement, and CO-absorbed diffuse reflectance infrared Fourier transform spectroscopy. This catalyst shows excellent catalytic efficiency in trans -stilbene epoxidation to yield trans -stilbene oxide (TOF: 416 h −1 ; conversion: 84 %; selectivity: 99 %), along with excellent recyclability and scalability. In addition, various aromatic olefins were successfully transformed into the corresponding epoxides with high selectivity and excellent yield. DFT study further reveals that the high catalytic activity originates from under-coordinated single palladium atoms in the defect-containing γ-AlOOH in a unique coordination environment. This lays the foundation for the facile creation of single atom catalysts and sheds light on the possibility for scale-up production.
研究领域:
催化化学
·
材料科学
·
理论化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Han Jia,Juan He,Yingbiao Xu,Tingyi Wang,Lingyu Zhang,Bowen Wang,Xincan Jiang,Xu Li,Xingyuan Zhang,Kaihe Lv
The surfactant assisted nanoparticle stabilized emulsions exhibit the wide potential application and attract more and more attention. In the present study, the flake-like hydrophilic AlOOH nanoparticles were employed to stabilize Pickering emulsions with the assist of slightly amphiphilic sodium benzenesulfonate (SBS) molecules. The measurements of FTIR spectra , three-phase contact angle, zeta potential and Z-average diameter adequately testified the successful adsorption of SBS on AlOOH nanoparticles. Both slightly amphiphilic SBS and highly hydrophilic AlOOH nanoparticles could hardly stabilize emulsions, whereas the SBS modified AlOOH nanoparticles exhibited distinguished emulsifying capacity, which was reflected via the Turbiscan Stability Index and the reference values of backscattered light intensity . Batch adsorption experiments were conducted and the adsorption data was better fitted to the Langmuir model, suggesting that SBS could form monolayer adsorption on AlOOH nanoparticles. Confocal laser scanning microscopy and rheological measurements demonstrated that the functionalized AlOOH nanoparticles could spontaneously adsorb at the oil/water interface to form an interfacial film and generate a three-dimensional network structure in the continuous phase to effectively prevent droplet coalescence in normal and harsh conditions. Furthermore, SBS/AlOOH stabilized O/W emulsions presented significant displacement performance (tertiary oil recovery of 18.87%) in core flooding experiments. Microscopic visualization tests showed that the emulsions could block high permeability channels and enlarge the sweep area. This study opens up the possibility of adopting low surface-active molecules and hydrophilic nanoparticles to stabilize Pickering emulsions for enhanced oil recovery (EOR).
研究领域:
石油工程
·
界面化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）