SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Junmiao Yu,Xiaoxia Yang,Changkai Wang,Mingxia Huang,Butera Hassan,Zhihong Yang,Xizhu Yang,Bin Huang,Xuejun Pan
This paper integrated alkai-dried sewage sludge (SS) using calcium oxide (CaO) and bagasse (BA) with a two-stage sorption-enhanced steam gasification (SESG) process to separately generate high-purity H 2 and CO at different temperature regions, while exploring optimal conditions and coupling mechanism. Response surface experiment revealed that SS and BA exerted opposing effects on H 2 and CO production, highlighting the importance of balancing their mass ratio. Increasing CaO dosage and H 2 and CO-generation stages temperatures enhanced H 2 and CO production. The optimal conditions were identified as a CaO dosage of 1.2, with temperatures of 600 °C and 750 °C for H 2 and CO-generation stages, considering cost and energy efficiency. With the optimal CaO and BA dosage, the moisture of SS reduced from 80 % to below 40 % within 3h, enabling low-energy dewatering. During H 2 -generation stage (600 °C), residual moisture and Ca(OH) 2 in the dried SS generated in-situ steam promoting steam reforming reactions, and Ca(OH) 2 has more CO 2 sorption capacity than CaO and catalytic effect of cyclization and dehydrogenation of generated tar, to boost H 2 production. During CO-generation stage (750 °C), CaCO 3 released CO 2 to gasify char, improving CO production. The process produced 113.5 mL/g dry biomass of H 2 with 74.1 vol% purity during H 2 -generation stage and 113.3 mL/g dry biomass of CO with 59.8 vol% purity during CO-generation stage. This paper proposed a new approach for drying and resource utilization of SS for inherently separated generation of high-purity H 2 and CO, providing a more sustainable and resource-efficient process.
研究领域:
能源工程
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环境工程
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化学工程
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产品关联
DOI
高影响因子
ELECTROCHEMISTRY
·
2024
·Vol. 92
·期 4
·043015-043015
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IF 2.7
Yuxiang ZHONG,Yuanjia MA,Yangzhou HE,Xiao YANG
The authors focus on the development of a molten salt processing technology for extracting white phosphorus (P4) from sewage sludge ash, which is recognized as a potential secondary P source due to its composition of various metal phosphates. This work offers insights into the interaction between solid AlPO4 and molten CaCl2. The results show that solid AlPO4 exhibits favorable solubility in molten CaCl2, although at a slower rate compared to solid Ca3(PO4)2 due to the presence of stable Al–O bonds. The study also demonstrates the feasibility of extracting high-purity P4 from the molten mixture through electrolysis. The purity of the obtained electrolyzed P4 from AlPO4 is comparable to the commercially available high-purity-grade product. These findings underscore the potential of sewage sludge ash containing AlPO4 as a viable source for extracting high-purity P4. This research contributes to the advancement of sustainable P utilization technologies from secondary sources.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Wenjie Zhu,Yuwei Ren,Minghang Li,Yichun Bi,Ce Zheng,Xiaoqiang Li
Ti 3 SiC 2 MAX phase with a purity of up to 98 vol%, comparable to the purity of commercial Ti 3 SiC 2 prepared by Hot Pressing (HP), was synthesized by Reactive Melt Infiltration (RMI) in this work, overcoming the inherent shortcoming of RMI products' poor purity. Compared with HP Ti 3 SiC 2 , the lower preparation temperature and pressure-free fabrication of high-purity RMI Ti 3 SiC 2 make it promising for applications in the Ceramic Matrix Composites (CMCs), especially for complex shaped CMCs parts. This work systematically studied the generation mechanism of Ti 3 SiC 2 with the help of κ-Al 2 O 3 during the RMI process, which enables the successful production of high-purity Ti 3 SiC 2 . The toughening mechanism of Ti 3 SiC 2 in Ti 3 SiC 2 composites was also characterized and analyzed. This work attempts to provide a new idea for introducing high-purity ceramic phase into CMCs by RMI process.
研究领域:
材料科学
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陶瓷材料
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产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 23
·5356
·
IF 3.057
Weihua Chen,Jiancheng Tang,Xinghao Lin,Yunlong Ai,Nan Ye
In the present study, high-purity ternary-phase nitride (Ti2AlN) powders were synthesized through microwave sintering using TiH2, Al, and TiN powders as raw materials. X-ray diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were adopted to characterize the as-prepared powders. It was found that the Ti2AlN powder prepared by the microwave sintering of the 1TiH2/1.15Al/1TiN mixture at 1250 °C for 30 min manifested great purity (96.68%) with uniform grain size distribution. The formation mechanism of Ti2AlN occurred in four stages. The solid-phase reaction of Ti/Al and Ti/TiN took place below the melting point of aluminum and formed Ti2Al and TiN0.5phases, which were the main intermediates in Ti2AlN formation. Therefore, the present work puts forward a favorable method for the preparation of high-purity Ti2AlN powders.Keywords:MAX-phase Ti2AlN;microwave;synthesis;high-purity powder
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2016
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IF 1.207
Lei Yang,Yangyang Zhang,Hua Li,Hezhou Liu
Metallic bismuth crystal is one important and interesting semimetal that has attracted great attention owing to its unique thermal and electrical properties. Herein, we report a facile, green, cost-effective and sustainable solvothermal process using ethanol, glycol, isopropanol, phenylcarbinol as solvent and commercial Bi 2 O 3 as the starting material to produce high-purity metallic Bi with tunable morphologies on large scale. It is found that all alcohols are capable of reducing Bi 2 O 3 to Bi and the reducibility of glycol is proved to be the strongest. The highest purity of the resultant Bi is calculated to be 99.74%. What's more, the morphology of final Bi particles is controllable by adding various types and concentrations of additives. As a consequence, our work lays the root for the large scale solvothermal production of high-purity Bi particles with various regular morphologies.
研究领域:
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
Journal of Central South University
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2023
·Vol. 30
·期 5
·1512-1522
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IF 4.4
Dong Zhao-wang,Duan Liang-hong,Liu Han-ning,Guo Xue-yi,Xia Yang
High-purity zirconium metal has been of rising significance to the nuclear and energy industry. However, zirconium exhibits a strong chemical affinity to oxygen, which causes high-purity zirconium metal to be difficult to produce cost-effectively. Powder metallurgy for preparing zirconium metal can achieve near net forming of zirconium metal. Zirconium powder can be prepared by deoxidation of zirconium hydride powder. In this study, an efficient process was proposed to prepare high-purity ZrH 2 using magnesium powder as reducing agent in hydrogen atmosphere. A specific investigation was conducted on the effect of hydrogen on the magnesiothermic reduction and deoxidation of ZrO 2 . As indicated from the results, the oxygen content of the reduced powder in Ar was over three times that in H 2 atmosphere at 750 °C for 240 min. Moreover, a passive oxide layer, with a thickness of ~2.76 nm in H 2 and of ~8.51 nm in argon, was formed on the edge of the reduced powder. In accordance with thermodynamic calculation, hydrogen was found to be capable of destabilizing Zr-O solution. An ultra-high pure zirconium hydride powder containing <350×10 −6 oxygen and particle size of <100 µm was prepared as assisted by hydrogen.
研究领域:
材料科学
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核能工程
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粉末冶金
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产品关联
DOI
高影响因子
LANGMUIR
·
2019
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IF 3.683
Muhammad Murtaza,Naveed Hussain,Junchen Liu,Hui Wu
Metallic dendrites with uniform morphology, high purity, and large yield remain challenging to synthesize. In this work, single-crystalline silver (Ag) dendrites with uniform morphology, high purity, and large yield are successfully synthesized by employing single replacement reaction between aqueous silver nitrate (AgNO3) and solid copper (Cu) by jet. The combined effect of diffusion-limited aggregation and the locally oriented attachment of Ag particles is responsible for the formation of silver dendrites under nonequilibrium conditions. Finally, the potential applications of as-synthesized silver dendrites are demonstrated by successfully preparing silver-based conductive ink for flexible electronics and wearable equipment. The conductive pattern exhibits resistivity of 7.2 μΩ·cm, showing good conductivity of the prepared conductive material. This facile and time-efficient synthetic route can be extended to synthesize other noble metal nanostructures with desired morphologies by adopting selective precursor salt concentrations and substrate metals with proper redox potentials.
研究领域:
材料科学
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化学合成
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产品关联
DOI
PubMed
高影响因子
Journal of Oleo Science
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2023
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IF 1.5
Ximei Yang,Sen Lin,Ying Chen,Wen Chen,Dongming Lan,Yonghua Wang
Nervonic acid (NA) is a monounsaturated fatty acid vital for brain health and is of emerging importance in various industrial applications, including therapeutics, food, and cosmetics. Given the growing demands of the food and pharmaceutical industries, there's a pressing need for high-purity NA. Previously, NA constituents in plant seed oils were chemically transformed into nervonic acid ethyl ester (NAEE) to facilitate extraction from seed oils. In this study, we present an enzymatic approach to convert NA constituents in Malania oleifera seed oil to NAEE. Combined with the utilization of the semi-preparative chromatography, we achieved a remarkable purity of 97.52% NAEE. Compared to conventional chemical preparations characterized by multiple steps, prolonged processing times, and low yields and purities, our enzymatic method stands out as a more efficient and advantageous alternative. On top of that, this innovative approach is environmentally friendly and circumvents health and safety issues associated with chemical processes.
研究领域:
生物化学
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食品科学
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制药工程
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产品关联
DOI
PubMed
高影响因子
Materials
·
2025
·Vol. 18
·期 10
·2373
·
IF 3.2
Jing Zhu,Xiyun Yang,Yongqiang Huang,Rongzheng Yao
With the depletion of solid lithium ore, extracting lithium from salt lake brine has become a critical focus for future endeavors. A four-step method was used to synthesize high-purity H1.6Mn1.6O4for extracting Li+. Porous cubic Mn2O3was hydrothermally synthesized with carbon spheres and surfactants as templates. Then, it was converted to LiMnO2by calcining with Li2CO3. After roasting and acid pickling, H1.6Mn1.6O4was successfully synthesized. The impacts of calcination temperature, Li/Mn molar ratio and glucose addition on LiMnO2composition, loss percentage of dissolved Mn in precursor, and the adsorption characteristics of the lithium ion sieve were studied. Glucose inhibited the formation of LiMn2O4and promoted the formation of pure LiMnO2. The resulting precursor without impurities showed porous structure. After acid pickling, H1.6Mn1.6O4showed a high-adsorption performance and excellent cycle performance. After five cycles, adsorption capacity remained above 30 mg/g, and the loss percentage of dissolved Mn stabilized at about 1%. The Li+–H+exchange conformed to pseudo-second-order adsorption dynamics and the Langmuir adsorption isotherm equation, indicating that the adsorption process can be classified as monolayer chemical adsorption.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
Nature Communications
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2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Jiao Jiqing,Ma Yanbin,Han Xiaoqian,Ergu Awu,Zhang Chao,Chen Pingping,Liu Wei,Luo Qiquan,Shi Zhaolin,Xu Han,Chen Chen,Li Yaguang,Lu Tongbu
CO 2 conversion to CH 3 OH under mild conditions is of particular interest yet rather challenging. Both electro- and thermo-catalytic CO 2 reduction to CH 3 OH can only produce CH 3 OH in low concentration (typically mixed with water), requiring energy-intensive purification processes. Here we design a sun-simulated-driven tandem catalytic system comprising CO 2 electroreduction to syngas, and further photothermal conversion into high-purity CH 3 OH (volume fraction > 97%). We construct a self-supporting electrocatalyst featuring dual active sites of Ni single atoms and encapsulated Co nanoparticles, which could produce syngas with a constant H 2 :CO ratio of ~2 via solar-powered CO 2 electroreduction. The generated syngas is subsequently fed into the photothermal module, which could produce high-purity CH 3 OH under 1 sun-light irradiation, with a rate of 0.238 g CH3OH g cat –1 h –1 . This work demonstrates a feasible and sustainable route for directly converting CO 2 into high-purity CH 3 OH.
研究领域:
化学工程
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可再生能源
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环境科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Fei Fei Li,Xue Song Jiang,Jing Wei Li,Bo Yuan Ban,Jian Chen
The one of major impurities in quartz is iron, which has a great impact on the properties of the material and should be be strictly removed in many applications. In this study, a low-energy consumption, simple, fast processing is introduced by combination microwave treatment with different acid leaching. Selective heating of microwaves is used to process quartz, causing local phase changes to improve the purification effect. Acid leaching was used to remove the iron in the quartz matrix. Under optimized conditions, the iron content can be reduced to below 0.167 ppmw with one single purification pass.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Keke Guan,Wen Lei,Honghong Wang,Xuefeng Liu,Jin Luo,Jianghao liu,Quanli Jia,Haijun Zhang,Shaowei Zhang
In this work, Ti 3 AlC 2 powders with high purity were prepared by microwave-assisted molten salt method (MA-MS). The synthesis parameters (such as raw materials ratio, heating temperature and reactant materials) and the formation mechanisms were systematically investigated. The results indicate that Ti 3 AlC 2 powders with a high purity up to 98.5% are prepared using TiH 2 /Al/1.8TiC mixture as reactant materials, and NaCl–KCl as molten salt by microwave-assisted heating at 1050 °C for 30 min. Compared with traditional heating methods, both the synthesis temperature and holding time of highly pure Ti 3 AlC 2 powders synthesized in this work are much milder. This high-efficiency synthesis approach could be ascribed to the synergistic effect of molten salt and microwave heating. Moreover, the TiH 2 –Al–TiC starting material is more suitable for the rapid synthesis of Ti 3 AlC 2 powders with high purity via present microwave-assisted molten salt method than that TiH 2 –Al–C.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
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