Journal of CO2 Utilization
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2019
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IF 5.189
Jing Chang,Chengming Hou,Donghai Wan,Xiuli Zhang,Bin Xu,Hongjing Tian,Xia Wang,Qingjie Guo
An alcoholamine, 2-[2-(dimethylamino)ethoxy]ethanol (DMAEE), was co-tethered with pentaethylenehexamine (PEHA) on the surfaces of the flue gas desulfurized gypsum (FGDG) carriers to synthesize a solid bi-amine adsorbent. The effects of temperature, loading of the blended amines, mass ratio of DMAEE to PEHA, CO 2 partial pressure on the CO 2 adsorption performance were discussed. The water of hydration contained in the FGDG carriers promoted the CO 2 adsorption capacity of the bi-amine adsorbent. Both the breakthrough time and the saturation adsorption capacity of the bi-amine adsorbent were distinctly higher than the DMAEE or PEHA singly tethered adsorbents. The adsorption capacity of the bi-amine adsorbent decreased by only 1.86% over twelve cycles. The isosteric heat of adsorption Q s t and the mean free energy of adsorption E f e was determined and both the values indicated that the adsorption was primarily chemisorption. In the kinetics analysis, Avrami model fitted best with the measured adsorption capacity. With the aid of the 13 C–NMR quantitative analysis results, the CO 2 adsorption mechanism of the bi-amine adsorbent in the presence of the water of hydration was revealed. For the bi-amine adsorbents supported on some porous carriers, FGDG particles were testified to replace up to 7 wt.% of montmorillonite clay or 7 wt.% of MCM–41 zeolite or 10.5 wt.% of ZSM–5 zeolite without any decrease in the CO 2 adsorption capacity.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2020
·Vol. 96
·期 4
·980-989
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IF 2.75
Xiao-Jia Tang,Zhong-Yuan Du,Heng-chao Chuang,Yi-Min Zhu,Yang-yuan Ji,Xiao-Yi Li,Yu-Zhe Zhao,Hai-Bo Kuang
BACKGROUND The dissolubility of magnesium hydroxide is often the main factor limiting its application effect in the environmental field, and the dissolution rate of magnesium hydroxide during its synthesis is also worthy of attention. In this paper, response surface methodology was used to synthesize magnesium hydroxide with different dissolution rates through a magnesium oxide/ammonium acetate hydration system, and the possible formation mechanism as well as dissolution performance is discussed. RESULTS Compared with the hydration temperature and time, the concentration of ammonium acetate has a more significant effect on the dissolution rate of hydrated magnesium hydroxide. A maximum dissolution rate of 43.8 ± 0.3 mmol min −1 mol −1 magnesium hydroxide could be obtained when the working factors were ammonium acetate concentration 15 g L –1 , hydration temperature 75.5 °C and time 112 min. CONCLUSION The correlation study between structural characterization and the dissolution test shows that the complexation and replacement of acetate, in situ generation and release of ammonia appear to have some critical effects on magnesium hydroxide crystallization behaviour and induce the formation of thin, curved and defective structures. Crystals with such structures have been reported to have a higher dissolution activity. The results of this study provide an indication for screening hydration synthetic agents of high-dissolution-rate magnesium hydroxide. © 2020 Society of Chemical Industry (SCI)
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2018
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IF 3.463
Qinqin Wang,Mingyuan Zhu,Haiyang Zhang,Caixia Xu,Bin Dai,Jinli Zhang
Zr-modified ZSM-5 zeolite was successfully prepared, and Zn/Zr-ZSM-5 was employed as a catalyst for the acetylene hydration reaction. High catalytic activity, above 96% C 2 H 2 conversion, was achieved at 260 °C with a feed reactant ratio of H 2 O/C 2 H 4 = 4 and a GHSV of 90 h −1 . To understand the influence of zirconium addition in the zeolite, Fourier-transform infrared spectroscopy, X-ray diffraction, surface texture analysis (BET method), transmission electron microscopy, temperature programmed desorption of NH 3 , temperature programmed reduction by hydrogen and X-ray photoelectron spectroscopy techniques were used. The incorporation of zirconium in the zeolite enhanced Zn metal dispersion and metal–support interactions. Moreover, an enhanced concentration of weak acid sites and active catalytic sites were found to be responsible for the high catalytic activity of Zn/Zr-ZSM-5 for the acetylene hydration.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2018
·Vol. 102
·期 3
·1414-1424
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IF 2.956
Yaowu Wei,Tao Zhang,Qi Zhang,Bingqiang Han,Nan Li
Improving the hydration resistance of CaO aggregates is the key to successful application of lime-based refractories in metallurgical industry. Additive Zr(OH) 4 and Al(OH) 3 were introduced in the preparation of CaO granules using granulation equipment and calcination method in this study. The results showed that the hydration resistance of CaO granules was improved significantly, especially for granules with 0.6 wt.% Zr(OH) 4 and 0.9 wt.% Al(OH) 3 , respectively. The shell of CaO granules was relatively dense after calcination and the volume of open pores of CaO granules decreased from 3.56 × 10 −2 to 1.80 × 10 −2 cm 3 /g when additive was introduced. Zr(OH) 4 and Al(OH) 3 have the opposite effect on the closed porosity of CaO granules, the closed porosity of CaO granules was decreased with Zr(OH) 4 addition, but increased with Al(OH) 3 addition.
研究领域:
材料科学
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冶金工程
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2022
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IF 7.693
Bing Yin,Xianle Hua,Dongmei Qi,Pan Wang,Gang Qiao,Fangyu Fan,Xujiang Hua,Xinpeng Wang,Dongshuai Hou
Cement-based materials are irreplaceable in civil engineering, and hence, there is an ongoing effort to advance their mechanical properties for broadening their utilization in different applications. Modification with polymer still has excellent potential. In this current study, a polymer-modified cement-based material with high flexural strength is prepared by in-situ atom transfer radical polymerization of acrylamide (AM). Polyacrylamide (PAM) is formed by in-situ polymerization as the cement hydrates. The AM monomer in-situ polymerizes rapidly during the first hours and slows down the early cement hydration. The mechanical properties, the microstructure, and the modification model are detailed studied. The results indicate that the proposed composites offer outstanding performance in some aspects. With the M/C ratio increasing, the flexural strength is remarkably improved, by 130% at 7d and 110% at 28d. The mechanisms of performance improvements by in-situ polymerization of AM were also examined. On the one hand, the evenly distributed cross-linked organic–inorganic frameworks, making the flexural strength of samples impressively improved as the monomer to cement ratio increases. On the other hand, due to the polymer, the presence of carboxyl functional groups produces bridged chemical bonds, which further improves the properties of the composite materials. The successful application of in-situ polymerization offers a new strategic approach to solve problems associated with concrete applications and provides technical guidance for improving of concrete structures.
研究领域:
土木工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Xianbin Huang,Jinsheng Sun,Jiafeng Jin,Kaihe Lv,Haichao Li,Kesheng Rong,Chao Zhang,Xu Meng
Wellbore instability caused by the hydration of shale formations during the drilling process is the main technical problem in drilling engineering. The existing shale inhibitors mainly inhibit shale hydration through charge neutralization, intercalation, activity reduction, and/or plugging. Few shale inhibitors focus on reverse the wettability of shale surface. In the paper, the shale inhibition performance of silicone quaternary ammonium salt (SQAS), a material that can reverse the wettability of shale surface, was evaluated and the shale inhibition mechanism of SQAS was studied via particle size, zeta potential, contact angle, scanning electron microscopy (SEM), and shale water absorption analyses. The experimental results show that the use of SQAS could result in a relatively lower linear swelling rate of clay, and its rolling recovery rate of easily hydrated shale was as high as 64.25%, which is better than those of polyamine inhibitors. The study on the inhibition mechanism revealed that SQAS can chemically react with the shale surfaces to form a seamless hydrophobic film. The water contact angle on the shale surface was increased from 28.7° to 110.7°, which greatly reduces water penetration into shale and the water absorption capacity of clay minerals. The results of this study provide new technical ideas for the development of high-performance shale inhibitors.
研究领域:
石油工程
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材料科学
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地质学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Dong Su,Junkui Miao,Xiaofang Liu,Xixi Wang,Yuan Yu,Kailiang Leng,Yueqin Yu
The main components of Antarctic krill oil are glycerides and phospholipids, and the sn -1 and sn -2 positions of the phospholipids are occupied by eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which improves their bioavailability and water solubility. This study aimed to efficiently separate and concentrate glycerides and phospholipids rich in ω-3 unsaturated fatty acids from Antarctic krill with the help of ethanol, water, and n -hexane, utilizing the hydrophilic-lipophilic balance (HLB) differences between products and the phase equilibria between solvents. The extraction ratio, species and contents of phospholipids, glycerides, cholesterol, astaxanthin, fatty acid composition, and smell characteristics changes of the two products were characterized, and the influence of temperature on the experiment was discussed. The optimal solvent ratio was x H 2 O : x C 2 H 5 O H : x C 6 H 14 = 2: 5: 3 and the ideal hydration temperature was 40 °C. Under these conditions, two products were obtained, N-H and E-W, the extraction yield of N-H was 19.6 %, and glycerides was its main component (89.8 %) with rich astaxanthin (292.3 mg/kg); the extraction yield of E-W was 13.2 %, mainly composed of phospholipids (92.4 %), which was also rich in EPA and DHA (37.9 % and 11.9 %, respectively). This study provides a theoretical basis and technical guidance for the development of new products of Antarctic krill.
研究领域:
食品科学
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生物化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Jiao-jiao Yu,Zhi-yao Zhang,Xiang-na Lin,Yan-qing Ji,Ran-ran Zhang,Hui Ji,Ye Chen
To improve the hydration properties of high-temperature pressed peanut protein isolate (HPPI), we investigated the effect of cold plasma (CP) oxidation on functional and structural properties. Compared to HPPI, the hydrated molecules number and the surface contact angle were significantly decreased at 70 W, from 77.2 × 10 9 to 17.7 × 10 9 and from 85.74° to 57.81°, respectively. The reduction of the sulfhydryl content and the increase of the disulfide bond and di-tyrosine content indicated that the structural transformation was affected by the oxidation effect. In terms of structural changes, a stretched tertiary structure, ordered secondary structure, and rough apparent structure were observed after CP treatment. Additionally, the enhancement of surface free energy and group content such as -COOH, -CO and -OH on the surface of HPPI contributed to the formation of hydrated crystal structures. In general, the oxidation effect of CP effectively improved the hydration properties of HPPI and broaden its application field.
研究领域:
食品科学
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生物技术
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材料科学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Zehao Chen,Yunjia Wang,Xuekai Jin,Zhuoyue Tian,Yunpeng Zhang,Xiufang Wen,Jihao Zuo,Pihui Pi
Three-dimensional superhydrophilic materials, with large pores and extensive permeation channels, can achieve high-flux separation of oil-in-water emulsions. However, complex internal structure and high specific surface area also lead to severe oil contamination during the separation process, resulting in rapid declines in separation efficiency and permeation flux, necessitating frequent cleaning and significantly limiting their practical applications. The oleophobicity of superhydrophilic materials mainly relies on the hydration layer on the surface. Enhancing the combination strength of superhydrophilic surfaces to water can effectively reduce the hydration layer damage caused by oil, thereby extending the demulsification lifespan of the material. In this study, we enhance the hydration strength of the copper foam surface by constructing a special pocket-like nano structure and endowing it with a substantial number of hydrated groups. During continuous separation of oil-in-water emulsions, the copper foam filter can achieve a separation efficiency exceeding 99.1 % and a permeation flux greater than 20,000 L·m −2 ·h −1 . In cyclic separation tests, under conditions where the cleaning interval up to 150 mL of emulsion, the declined efficiency remains at 98.4 %, while the declined flux exceeds 18,000 L·m −2 ·h −1 . The cleaning interval is as high as 85 mL·cm −2 . Furthermore, after cleaning, both the separation efficiency and permeation flux of the copper foam can be completely restored, significantly outperforming the copper foam without hydration strengthen modification and various other three-dimensional materials.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Journal of Building Engineering
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2022
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IF 7.144
Xiaoyan Liu,Li Liu,Kai Lyu,Tianyu Li,Pingzhong Zhao,Ruidan Liu,Junqing Zuo,Feng Fu,Surendra P. Shah
In recent years, an ever-increasing amount researchers dedicated themselves to exploring the possibility of introducing recycled concrete powder (RCP) into concrete as a substitute for cement. To optimize the effect of RCP on cement-based materials, this paper uses nano-silica (NS) to learn the hydration and mechanical properties of cement-based materials with RCP. The results indicated that after adding NS into RCP-cement pastes, the setting time of cement pastes was significantly reduced, while the samples' early hydration rate and hydration heat increased. Besides, the mechanical strength of the mortar decreased as RCP replaced part of the cement, while 2% NS can compensate for the mechanical strength loss of mortar caused by RCP as supplementary cementing materials. The X-ray computer tomography (X-ray CT) and mercury intrusion porosimetry (MIP) results showed that RCP increased mortar's pore volume fraction and porosity. In contrast, NS in RCP blended mortar significantly decreased the number of pores with a pore volume between 0.01 and 0.03 mm 3 and increased the proportion of harmless pores (From 28.6% to 31.4%). Hence, NS reduced the pore volume fraction and porosity of mortar. The results of X-ray CT and MIP showed that NS could refine the pore size in RCP blended mortar. X-ray diffraction (XRD) and scanning electron microscope (SEM) further revealed that the existence of NS can eliminate the adverse effects brought by RCP.
研究领域:
土木工程
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材料科学
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DOI
高影响因子
Journal of the Australian Ceramic Society
·
2019
·Vol. 56
·期 2
·795-801
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IF 0.692
Zhang Tao,Wei Yaowu,Chen Junfeng,Li Nan
In spite of the advantages of CaO refractories, such as high refractoriness, potential to produce pure steel molten, and high alkaline corrosion resistance, their application has been limited due to its poor hydration resistance. Introducing additives to improve the hydration resistance of lime is a novel method. The influences of Mg(OH) 2 and sintering temperatures on the sintering and hydration resistance of CaO aggregates that were produced by thermal decomposition were investigated in this paper. The purpose of this work was to produce high-purity CaO raw material with high density, low porosity, well grain growth, and good hydration resistance economically. The sintered samples were characterized by bulk density, apparent porosity, surface appearance, and microstructure. The results indicated that (1) Mg(OH) 2 promoted the grain growth of CaO, reduced the apparent porosity, and improved the density of the specimens. The hydration resistance of the samples was increased. (2) Increasing the sintering temperature improved the hydration resistance of the specimens obviously in the experiment. (3) Grain size of CaO was more uniform with the increment of Mg(OH) 2 content, and the density of the compacts was improved.
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
Polymers
·
2018
·Vol. 10
·期 2
·128
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IF 2.935
Bing Li,Qi Zhong,Dapeng Li,Ke Xu,Lu Zhang,Jiping Wang
The influence of ethylene glycol methacrylate (EGMA) to the hydration and transition behaviors of thermo-responsive interpenetrating polymeric network (IPN) hydrogels containing sodium alginate,N-isopropylacrylamide (NIPAAm), and EGMA were investigated. The molar ratios of NIPAAm and EGMA were varied from 20:0 to 19.5:0.5 and 18.5:1.5 in the thermo-responsive alginate-Ca2+/P(NIPAAm-co-EGMA) IPN hydrogels. Due to the more hydrophilicity and high flexibility of EGMA, the IPN hydrogels exhibited higher lower critical solution temperature (LCST) and lower glass transition temperature (Tg) when the ratio of EGMA increases. The swelling/deswelling kinetics of the IPN hydrogels could be controlled by adjusting the NIPAAm/EGMA molar ratio. A faster water uptake rate and a slower water loss rate could be realized by increase the amount of EGMA in the IPN hydrogel (the shrinking rate constant was decreased from 0.01207 to 0.01195 and 0.01055 with the changing of NIPAAm/EGMA ratio from 20:0, 19.5:0.5 to 18.5:1.5). By using 2-Isopropylthioxanthone (ITX) as a photo initiator, the obtained alginate-Ca2+/P(NIPAAm-co-EGMA360) IPN hydrogels were successfully immobilized on cotton fabrics. The surface and cross section of the hydrogel were probed by scanning electron microscopy (SEM). They all exhibited a porous structure, and the pore size was increased with the amount of EGMA. Moreover, the LCST values of the fabric-grafted hydrogels were close to those of the pure IPN hydrogels. Their thermal sensitivity remained unchanged. The cotton fabrics grafted with hydrogel turned out to be much softer with the continuous increase of EGMA amount. Therefore, compared with alginate-Ca2+/PNIPAAm hydrogel, alginate-Ca2+/P(NIPAAm-co-EGMA360) hydrogel is a more promising candidate for wound dressing in the field of biomedical textile.Keywords:thermo-responsive;interpenetrating polymeric network hydrogel;ethylene glycol methacrylate;N-isopropylacrylamide;cotton fabrics
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
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