Forests
·
2021
·Vol. 12
·期 2
·127
·
IF 2.634
Qiangqiang Liu,Haojia Du,Wenhua Lyu
In order to improve the performance of soft plantation wood, an environmentally friendly wood modifier was developed. First, using urea and melamine as crosslinking agents, the glucose-urea-melamine resin (MUG) was prepared with glucose under the catalysis of inorganic acid and metal ions. Then MUG, sodium silicate, and distilled water were mixed and stirred at 40 °C to prepare MUG resin/sodium silicate compound modifier (G20S10, G10S20, the subscript number represents the mass percentage of the component in the solution.). Then plantation poplar wood (Populus tomentosa) was impregnated and modified with them. Their physical and mechanical properties were tested and compared with those of the wood treated with sodium silicate of 20% mass fraction (S20). Infrared analysis showed that the amino resin characteristic structure (CO-NH-) existed in MUG, and the absorption peak of the furan ring (C=C) appeared. Compared with S20modified wood, the shrinkage degree of G10S20or G20S10modified wood is reduced, their moisture absorption is decreased, and their dimensional stability is improved. MUG resin/sodium silicate compound modifier can effectively enhance the wood’s density, modulus of elasticity, modulus of rupture, and compression strength. SEM analysis showed that there were columnar and granular solid substances attached to the cell wall, cell lumen, intercellular space, and vessel of G20S10modified wood. EDX showed that the number of Si elements on the cell wall was significantly increased compared with the control, indicating that the modifier effectively entered the wood cell wall. The G20S10can greatly improve the wood’s physical and mechanical properties through an organic–inorganic compound synergistic effect. It is a green, non-formaldehyde, low cost wood modifier with broad application prospects.Keywords:poplar;glucose resin;sodium silicate;impregnation modification;wood properties
研究领域:
林学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Zhao Cao,Zeyu Cheng,Jieliang Wang,Yongdan Cao
Bastnaesite is an important rare earth mineral and is usually beneficiated by flotation . Sodium silicate is commonly used to depress calcium-bearing gangue minerals, however it can also depress bastnaesite when Ca 2+ ions exist in the pulp. In this study, the effect of Ca 2+ ions and sodium silicate individually or in combination on bastnaesite flotation was studied through micro-flotation, zeta potential , fluorescence spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements. Micro-flotation results show that the combination of Ca 2+ ions and sodium silicate depresses bastnaesite more severely due to their synergistic effect. Zeta potential results show that the combination renders the surface potential of bastnaesite negatively shifted more significantly. Fluorescence spectroscopy shows that the combination decreases the surface hydrophobicity of bastnaesite more severely. XPS shows that the combination increases the adsorption of sodium silicate on bastnaesite by forming hydrophilic Ca-SiO 3 precipitate, which causes more serious depression on bastnaesite flotation.
研究领域:
矿物学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 4
·962-967
·
IF 1.3
Liu Zhigang,Tang Zezheng,Yang Lirong,Wang Chunmei,Xie Yuantao,Liu Yisen
The retarding effect of protein retarder on phosphorus building gypsum (PBG) and desulfurization building gypsum (DBG) was investigated, and the results show that protein retarder for DBG can effectively prolong the setting time and displays a better retarding effect, but for PBG shows a poor retarding effect. Furthermore, the deterioration reason of the retarding effect of protein retarder on PBG was investigated by measuring the pH value and the retarder concentration of the liquid phase from vacuum filtration of PBG slurry at different hydration time, and the measure to improve the retarding effect of protein retarding on PBG was suggested. The pH value of PBG slurry (<5.0) is lower than that of DBG slurry (7.8–8.5). After hydration for 5 min, the concentration of retarder in liquid phase of DBG slurry gradually decreases, but in liquid phase of PBG slurry continually increases, which results in the worse retarding effect of protein retarder on PBG. The liquid phase pH value of PBG slurry can be adjusted higher by sodium silicate, which is beneficial to improvement in the retarding effect of the retarder. By adding 1.0% of sodium silicate, the initial setting time of PBG was efficiently prolonged from 17 to 210 min, but little effect on the absolute dry flexural strength was observed.
研究领域:
建筑材料学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shaoyan Zhang,Jingzhong Kuang,Mingming Yu,Weiquan Yuan,Zheyu Huang
Effect of ultrasound on solution properties of sodium silicate (Na 2 SiO 3 ) was investigated in this study to separate scheelite from fluorite effectively. The effect of ultrasonicated sodium silicate solution on flotation separation of scheelite and fluorite and selective adsorption mechanism of scheelite and fluorite were also explored. Ultrasonicated Na 2 SiO 3 was found to significantly improve the scheelite grade, and the adsorption capacity and adsorption heat of Na 2 SiO 3 on fluorite surface were significantly improved, which can enhance the inhibitory effect. The ultrasonic cavitation effect promoted electrolysis of Na 2 SiO 3 in the solution, forms additional SiO 3 2− and SiO 4 4− ions, reduced surface tension of the solution, and thus reduced adhesion work between Na 2 SiO 3 and fluorite. Fourier transform infrared (FTIR) Spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses showed that sodium silicate was obviously adsorbed on the surface of fluorite, elemental Si content of the fluorite surface increased considerably and to a higher level than that of the scheelite surface, and Ca 2+ binding energy shifted less noticeably on the scheelite surface than that on the fluorite surface. These results indicated that the higher adsorption strength for Na 2 SiO 3 on the fluorite surface than that on the scheelite surface hindered the adsorption of benzohydroxamic acid (BHA) on the fluorite surface and ultrasound promoted selective separation of scheelite and fluorite.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Lijia Zhu,Yimin Zhu,Wenliang Xiong,Zheng Zhou,Peng Gao,Yuexin Han
Metal ions, naturally present in flotation pulp, are commonly employed in flotation reagents, serving as vital reagents in mineral separation processes. This study investigated the impact of ASS, a blend of AlCl 3 , sulfuric acid, and sodium silicate (SS), on the flotation separation efficiency of fluorite from dolomite, as well as the underlying interaction mechanism. Micro flotation tests revealed that ASS significantly decreased the flotation recovery of dolomite while exerting negligible influence on that of fluorite. The difference in flotation recovery rates among the two minerals reached 92.00 % with the addition of 103 mg/L of ASS. The artificial mixed mineral flotation tests were also carried out, the recovery rate and grade of F in the concentrate were 86.47 % and 42.79 %, respectively. The formation of the metal complex ASS, resulting from the combination of Al with Si(OH) 4 , facilitated the adsorption of their hydrolysis products on the surface of dolomite. Within the flotation pulp system, the Ca 2+ and Mg 2+ on the dolomite surface selectively interact with the –OH groups in ASS. At the same time, the Al 3+ in ASS selectively bonds with the O atom of the carbonate group exposed on the dolomite surface. This interaction promotes the adsorption of ASS onto the dolomite surface, thereby hindering the adsorption of sodium oleate. The fluorite surface exhibited weaker interactions with ASS, leading to more sodium oleate adsorbed on the surface of fluorite, thereby increasing the hydrophobicity of the fluorite particles, which floated up. As a result, the selective adsorption of the reagents facilitated the flotation separation of fluorite from dolomite.
研究领域:
矿物加工工程
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 1
·74
·
IF 5.3
Yun Deng,Ziyan Sha,Xingxing Wang,Ke Duan,Weijie Xue,Ian Beadham,Xiaolan Xiao,Changbo Zhang
To expand the applications of hydrophobic silica aerogels derived from rice husk ash (HSA) through simple traditional methods (without adding special materials or processes), this paper employs machine learning to establish mathematical models to identify optimal conditions for extracting water glass and investigates how preparation conditions and heat treatment temperatures affect properties such as the porosity and hydrophobicity of HSA. The results indicate that the decision tree regression model provides the most accurate predictions for the extraction rate and modulus of water glass. Notably, the water contact angle of HSA produced using nitric acid as a catalyst can reach as high as 159.5°, classifying it as a superhydrophobic material. Additionally, while moderately increasing the concentration of the hydrophobic modifier enhances HSA’s hydrophobicity, it concurrently reduces its porosity. The HSA maintained hydrophobicity until 500 °C. The pore structure of HSA collapsed gradually with the increase in heat temperature. After treatment at 700 °C, HSA lost its hydrophobicity and the porous structure was severely damaged. Compared with silica aerogel using traditional silicon sources, the damage to pore structure and the crystallization occurred at lower temperatures, but the hydrophobicity remained at higher temperatures.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Wenbo Wang,Guangyan Tian,Zhifang Zhang,Aiqin Wang
Silicate materials have been frequently used as stable, low-cost and efficient adsorbents for the removal of dyes and heavy metal ions from aqueous solution. Herein, at the aim of designing new adsorbent with higher adsorption capacity, natural palygorskite (PAL) was modified via a one-step hydrothermal process by introducing sodium silicate and magnesium salts. The effect of Si/Mg dosage ratio on the structure and physico-chemical features of the adsorbent was investigated, and its adsorption capability for Methylene blue (MB) and Cu(II) ions was intensively evaluated. It was found that Si/Mg dosage ratio is the key to control the adsorption properties of the adsorbent. The active magnesium silicate could be formed around PAL at the moderate Si/Mg dosage ratio, and even the undesirable quartz impurities without adsorption activity in the natural PAL minerals may transform as amorphous magnesium silicate with higher adsorption activity in this process. The adsorbent shows greater BET specific surface areas (407.3 m 2 /g), ideal surface charge distribution and superior adsorption capacity to MB and Cu(II) ions, with the maximum adsorption capacity of 527.22 mg/g for MB and 210.64 mg/g for Cu(II) ions at the Si/Mg dosage ratio of 2:1. The MB molecules and Cu(II) ion could be almost completely removed from 100 mg/L of MB solution and 25 mg/L of Cu(II) solution by the adsorbent, respectively, which is far away higher than that of raw PAL. The electrostatic attraction, ion exchange and chemical association of –Si–O − groups contribute to the enhanced adsorption for MB or Cu(II) ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 97
·期 5
·1305-1314
·
IF 3.709
Shixiong Tang,Fang Li,Jidong Liu,Bao Guo,Zenan Tian,Jianhua Lv
BACKGROUND Chemical recycling of waste poly(ethylene terephthalate) (PET) is an effective way to save energy and protect the environment. In this work, calcined sodium silicate was adopted as a novel solid base catalyst for methanolysis of PET for the first time. The effects of various parameters on the conversion of PET and the yield of dimethyl terephthalate (DMT) in the methanolysis process of PET were investigated. RESULTS The results showed that the conversion of PET could reach about 100% and the yield of DMT could reach about 95% under the following conditions: calcined sodium silicate, 5 wt%; molar ratio of methanol to PET, 5:1; reaction time, 30 min; reaction temperature, 200 °C. The higher the mass ratio of methanol to PET and the higher the temperature, the higher were the conversion of PET and the yield of DMT. In addition, the catalyst can be reused more than five times and has good catalytic activity. CONCLUSIONS Calcined sodium silicate has the advantages of low cost, simple fabrication method, high catalytic activity and environmental friendliness. The use of this solid base catalyst is a promising strategy for realizing the recycling of waste polyester. © 2022 Society of Chemical Industry (SCI).
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Tianming Zhu,Haoyuan Liu,Chenhao Sun,Zhen Ma,Xiaoxi Zuo,Junmin Nan
In comparison to the well-known separator of lithium-ion batteries (LIBs), there are unique characteristics and requirements for the separator of sodium-ion batteries (SIBs) to affect the electrochemical performance and safety. In this work, a composite separator (AP@NSIO) is successfully fabricated by constructing a fully encapsulated sodium silicate (NSIO) ceramic sheath on the fiber surface of a low-cost, recyclable airlaid paper (AP) matrix using a facile solution immersion method. Due to the comprehensive coating of sodium silicate on the matrix fiber, the prepared AP@NSIO separator not only has excellent mechanical strength and remarkable wettability but also maintains thermal dimensional stability at 250 °C and is nonflammable in flames. Moreover, the AP@NSIO separator exhibits a high porosity of ∼50.6%, an electrolyte uptake of ∼298.9%, an ion conductivity of 2.02 mS cm–1, and a sodium-ion transfer number of 0.91. The Na3V2(PO4)3 (NVP)|AP@NSIO|Na battery has an excellent capacity retention of 94.2% (96.8 mAh g–1) after 300 cycles at a high current density of 5C and maintains almost 100% Coulombic efficiency. These results indicate that the AP@NSIO separator is a potential candidate for application in safe and high-performance SIBs, and a strategy is provided for designing functional separators for SIBs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2021
·
IF 2.161
Yong Sun,Anqi Yu,Yuntao Liang,Gang Wang,Shuanglin Song,Wei Lu,Zhenglong He,Shaocong Meng
In order to understand the evolution of the structure–property relationship between the crosslink density and mechanical properties of polyurethane-urea/sodium silicate (PU/SS) hybrid composites, a series of PU/SS composites with 2.5 wt% organofunctional silanes and pure PU/SS composites are investigated at different curing time. Mechanical properties, the fracture surface morphology, and thermo-mechanical properties of these PU/SS composites are characterized by electron omnipotence experiment machine, scanning electron microscope, and dynamic mechanical analysis (DMA), respectively. The mechanical test results show the strength and fracture toughness of the PU/SS composites first increase and then stabilize during cure, and the modification leads to PU/SS composites with significantly higher mechanical properties. Further, the morphology of fractured samples also reveals that the longer curing time and the modification of the PU/SS composites means a higher curing degree. Moreover, the increase in the crosslink density calculated from the DMA tests quantitatively confirmed the positive influence of the curing time and the modification in enhancing mechanical properties. In addition, it is also found that the mechanical properties of the PU/SS composites not only depend on the crosslink density but also on the well-dispersed hybrid PU/SS system.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·Vol. 149
·期 23
·14449-14461
·
IF 3
Ma Qianyu,Gao Wei
Phase change materials (PCMs) exhibit a promising application as a heat storage medium in battery thermal management. However, the flammability, low thermal conductivity, and leakage problems of organic PCMs constrain the development. In this study, a novel strategy based on inorganic hydrated salt with natural nonflammability was proposed. Sodium acetate trihydrate and disodium hydrogen phosphate dodecahydrate composite materials (SAT-DSP) were synthesized without affecting the properties. The prepared SD@SiO 2 with sodium silicate as the precursor, while SAT-DSP as the core material, possessed the dual heat storage performance of phase transition and thermochemical heat storage. The SiO 2 shell with a dense surface successfully realized the encapsulation of SAT-DSP, and the combined effect of heterogeneous nucleation and mesoporous confinement effectively inhibited the phase separation of phase change materials. The optimal ratio of SD@SiO 2 was determined through a comprehensive analysis of morphology, thermal stability, and thermal storage properties. The heat storage density was up to 509.18 J g −1 with a phase transition temperature of 78.78 °C. It improved the chemical instability and leakage of hydrated salts and centralized the dehydration process of SAT-DSP to achieve rapid response. Even after continuous heating on a 120 °C heating platform for 30 min, the surface temperature of SD@SiO 2 was maintained within a safe range (< 65 °C). This inorganic phase change material exhibited considerable potential for application in battery thermal runaway protection.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Datong Zhang,Zhengping Ding,Ying Yang,Shuai Zhao,Qun Huang,Cheng Chen,Libao Chen,Weifeng Wei
Despite being considered as a promising candidate for cathode of next-generation batteries, sodium manganese orthosilicate suffers from sluggish kinetics, while no effective enhancement through structural manipulation has been reported yet. Herein a three-dimensionally ordered macroporous Na 2 MnSiO 4 /C is fabricated via a templated sol-gel method and investigated as a cathode material for sodium ion batteries. It delivers a high initial reversible capacity of 207 mAh g −1 (∼1.5 mol of Na + insertion/extraction) at 0.1 C (1C = 139 mAh g −1 ), excellent high-rate capability (76 mAh g −1 at 5 C) and long-term cyclability (76.0% after 345 cycles at 2 C). The superior electrochemical properties are ascribed to short Na-ion diffusion path of honeycomb-like 3D ordered macroporous structure, fast electron transportation of interconnected carbon frameworks and effective constraint of volumetric changes upon electrochemical cycling. The rational design of 3D ordered porous structure may facilitate the development of silicate-based cathode materials that have problems of low electronic conductivity, slow ion diffusion and structural instability for new high-energy sodium ion batteries.
研究领域:
材料科学
·
能源存储
✓ 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）