Surfaces and Interfaces
·
2024
·
IF 5.7
Yang Chen,Xiaohuan Wang,Xinba Yaer,Zhipeng Yuan,Guojun Ji
As a conversion-type anode material for lithium-ion batteries (LIBs), FeTiO 3 suffers from capacity fading due to the dissolution of Fe ions and the growth of solid electrolyte interphase (SEI) film. This hampers its practical application and further development in LIBs. To solve this issue, the microemulsion method (O/W) was used to encapsulate amorphous SiO 2 onto the surface of FeTiO 3 , constructing a FeTiO 3 @SiO 2 core-shell composite material. This strategy aims to alleviate the capacity loss caused by the rupture and detachment of active substances. The experimental results show that the FTO(FeTiO 3 ) electrode has a capacity of 300 mAh g −1 after 200 cycles at 100 mA g −1 , while the S 1 FTO(FeTiO 3 @SiO 2 ) electrode maintains a stable capacity of approximately 550 mAh g −1 . Furthermore, the capacity of the S 1 FTO (154.4 mAh g −1 after 500 cycles) still surpasses that of FTO (97.5 mAh g −1 after 500 cycles) at a current density of 1 A g −1 . Through ex situ XPS testing analysis of the variations under different current cycles, it is demonstrated that the SiO 2 coating has an inhibitory effect on the dissolution of Fe ions. This core-shell structure-design strategy is crucial for improving the lithium-storage performance of batteries, especially those containing conversion-type anode materials.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yanjia Zhou,Guihong Lan,Yongqiang Liu,Songsong Xue,Bo Xu,Haiyan Qiu,Keyu Pu
To obtain a demulsification material with convenient recovery, high oil-water separation capacity, and excellent reusability, Fe 3 O 4 @SiO 2 core-shell particles and hydrophilic DMC were introduced into the acrylic ester-based polymer system to prepare a magnetic amphiphilic composite demulsifier, Fe 3 O 4 @SiO 2 /poly(SMA-co-BA-co-BZMA-co-DMC) (Fe 3 O 4 @SiO 2 /PAMCs-P). The molecular structure of Fe 3 O 4 @SiO 2 /PAMCs-P was characterized using FT-IR and XPS, while the morphology was observed using SEM. Additionally, the effects of TEOS, Fe 3 O 4 @SiO 2 core-shell particles, and DMC dosage on the demulsification performance of the composites were discussed in detail. Fe 3 O 4 @SiO 2 /PAMCs-P exhibited excellent demulsification, oil-water separation, and reusability properties for CTAB-toluene emulsions. Under magnetic field conditions, Fe 3 O 4 @SiO 2 /PAMCs-P achieved saturated separation within 2 h with a separation efficiency of 97.9%. After five consecutive separations, the separation efficiency decreased to 39.1%, but it could be restored to 91.5% of the initial separation efficiency after desorption. These results indicate that Fe 3 O 4 @SiO 2 /PAMCs-P has valuable application potential in emulsified wastewater treatment.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
WASTE MANAGEMENT
·
2023
·
IF 8.1
Cong Li,Xiaofeng Yang,Yongkui Li,Yu Chen,Xiaodong Pan,Yongping Xie,Xingyu Liu,Suqin Li
Hematite tailings (HTs) are rich in silica and are used as replacements for fine aggregates in the preparation of construction materials. However, there is scope for a more effective utilization of the valuable elements present in HTs. In this paper, a process for preparing high-purity SiO 2 using HTs procured from Ansteel (China) is proposed. HTs were treated using the superconducting high-gradient magnetic separation (S-HGMS) technology, where the silica as part of the nonmagnetic fraction was obtained in the form of a high-silica concentrate, which was then subjected to mixed-acid leaching to dissolve impurities to achieve refined purification. The optimum process conditions for S-HGMS were determined, and the response surface methodology was applied to optimize the process parameters of the mixed-acid leaching process. The process indicators of the mixed-acid leaching step included the leaching time, leaching temperature, and molar ratio of the mixed acids. The optimum process conditions for S-HGMS were as follows: the magnetic strength-to-velocity ratio in the weak magnetic separation stage was set to 0.034 T·s/m whereas it was maintained at 0.076 T·s/m in the strong magnetic separation stage; the pulp concentration was 40 g/L, the pulp velocity was 500 mL/min, and the dispersant concentration was 1 mg/g. Under these conditions, the high-silica pulp was processed. The corresponding SiO 2 grade increased from 71.788 % to 95.260 %, and its recovery and yield reached 56.330 % and 42.450 %, respectively. The SiO 2 content in the sample increased from 95.260 % to 99.961 %. Further, the mechanisms of the S-HGMS and mixed-acid leaching were revealed. The proposed process is environmentally friendly and operationally inexpensive. It can reduce the amount of HTs by 42.450 %, and the obtained high-purity silica product has high economic value and good industrialization prospects.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xin Ning,Yiyuan Lu,Heyun Fu,Haiqin Wan,Zhaoyi Xu,Shourong Zheng
Supported Ni catalysts on three mesoporous SiO2 supports (i.e., SBA-15, MCM-41, and HMS) were prepared using a solid-state reaction between Ni(NO3)2 and organic template-occluded mesoporous SiO2. For comparison, supported Ni catalysts on mesoporous SiO2 synthesized by the conventional impregnation method were also included. The catalysts were characterized by scanning electron microscopy, X-ray diffraction, UV–vis diffuse reflectance spectroscopy, N2 adsorption, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction, transmission electron microscopy, and transmission electron microscopy–energy-dispersive X-ray. The catalytic properties of the catalysts were evaluated using gas-phase catalytic hydrodechlorination of 1,2-dichloroethane. The results showed that upon grinding Ni(NO3)2 with template-occluded mesoporous SiO2, strong coordination between Ni2+ and dodecylamine was identified in the Ni(NO3)2–HMS system. Additionally, the results of H2 temperature-programmed reduction revealed that NiO in calcined NiO/HMS was reduced at higher temperature than those in calcined NiO/SBA-15 and NiO/MCM-41, reflecting the presence of a strong interaction between NiO and mesoporous SiO2 in NiO/HMS. Consistently, the average particle sizes of metallic Ni were found to be 2.7, 3.4, and 9.6 nm in H2-reduced Ni/HMS, Ni/SBA-15, and Ni/MCM-41, respectively, indicative of a much higher Ni dispersion in Ni/HMS. For the catalytic hydrodechlorination of 1,2-dichloroethane, Ni/MCM-41 synthesized by the solid-state reaction method exhibited a catalytic activity similar to that prepared by the impregnation method, while higher catalytic activities were observed on Ni/HMS and Ni/SBA-15 than on their counterparts prepared by the impregnation method. Furthermore, a higher conversion was identified on Ni/HMS than on Ni/SBA-15 and Ni/MCM-41, highlighting the importance of template type for the preparation of highly dispersed metal catalysts on mesoporous SiO2.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 25
·4402-4409
·
IF 4.872
Nan Lv,Zhigang Wang,Wenzhi Bi,Guangming Li,Jilin Zhang,Jiazuan Ni
The novel chloro(dimethyl)octylsilane (C8)-functionalized [CeO2//SiO2] Janus fibers (denoted CeO2//SiO2-C8) have been successfully prepared by electrospinning technique and subsequent modification. The CeO2//SiO2-C8 Janus fiber composed of the side-by-side CeO2 fiber and SiO2 fiber modified by C8 is endowed with separate affinity sites and hydrophobic chains. It has a relatively high specific surface area of 127.4 m2 g−1 with an average pore size of 4.1 nm. The potential of CeO2//SiO2-C8 Janus fibers for the selective capture and individual MS detection of low-abundance endogenous peptides and phosphopeptides from the tryptic protein digest and human serum real sample was explored and evaluated for the first time. The experimental results demonstrate that the CeO2//SiO2-C8 Janus fiber can selectively extract phosphopeptides in virtue of high selective affinity of CeO2 to phosphate groups and enrich low-abundance peptides on account of the strong hydrophobic interaction of C8 chains. Moreover, the enrichment performance of the CeO2//SiO2-C8 probe is superior to that of commercial products (e.g. TiO2 nanoparticles and ZipTipC18 pipette tips) available. Overall, the efficient enrichment capability of CeO2//SiO2-C8 Janus fibers makes them a prospective candidate for the capture of low-abundance endogenous peptides and phosphopeptides from complex biological samples for individual MS detection.
研究领域:
生物化学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 47
·72058-72073
·
IF 5.19
Gao Jingqing,Liu Xiaobang,Ren Peng,Gao Jianlei,Chen Yong,Chen Zhijun
The novel iron-based reductive particles, functionalized with amino and carboxylic functional groups, were synthesized to remove Cr(VI) and Cd(II) ions from aqueous solutions. The morphological structure and surface functional groups of new composites were characterized with SEM, XRD, FTIR, BET, and other techniques. The influence of pH, initial concentration, adsorbent dosing, and temperature on removal efficiencies were explored by batch experiments. The adsorption capacity of Cr(VI) and Cd(II) increased by 159.95% and 76.60%, respectively, compared with Fe 0 , reaching 47.638 and 62.047 mg/g. EDS and XPS analysis showed most of Cr(VI) was reduced to Cr(III) and precipitated as ferrochrome oxide, and Cd(II) was mainly precipitated as hydroxide. Reduction-precipitation and complexation may predominate in the removal process of Cr(VI), which fitted well with Langmuir and Freundlich models and pseudo-second-order kinetics. While hydrolysis and complexation may prevail for Cd(II), which was suited with Langmuir model and pseudo-second-order kinetics. Having good magnetic properties, the A/C-Fe@SiO 2 particles exhibited excellent reusable stability after four times regeneration experiments, promising a prospect for in-situ remediations of groundwater contaminated by Cr(VI) and Cd(II).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Kexin Tao,Yuning Zhang,Yu Song,Zhiyuan Chen,Yao Wang,Yanxin Wang,Jianguo Tang,Linjun Huang
Water pollution has long been a significant issue, and the purification of dye wastewater plays a crucial role in addressing this problem. Graphene oxide (GO) has found extensive applications in water treatment due to its unique two-dimensional (2D) structure and a surface rich in a large number of oxygen-containing functional groups. We introduced silica(SiO 2 ) and polyethyleneimine(PEI) into GO to prepare a membrane. The experimental findings revealed that the 3-SiO 2 /GO binary composite membrane achieved a high water permeability of 45.6 L m −2 h −1 bar −1 while maintaining retention, which is nearly four times higher than that of the GO membrane (9.85 L m −2 h −1 bar −1 ).The water permeability of the PEI 0.2 -SiO 2 /GO ternary composite membrane achieved 42.37 L m −2 h −1 bar −1 . The rejection rate for methyl orange dye reached 92.36 %, with similar rejection rates all above 95 % observed for other dyes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Yamei Yue,Ziling Peng,Wei Wang,Yuncheng Cai,Fatang Tan,Xinyun Wang,Xueliang Qiao
The MgO-loaded SiO 2 nanocomposites were successfully synthesized via a facile precipitation and calcination method, and used for the elimination of antibiotics from aqueous solution. Multiple techniques such as X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FT-IR), transmission electron microscope (TEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) were employed to characterize the structure and morphology of the obtained nanocomposites. The effects of the loading content of MgO , initial solution pH and temperature on the adsorption performance of MgO-loaded SiO 2 nanocomposites were assessed by removing tetracycline from aqueous solution. It was found that 50% MgO-loaded SiO 2 exhibited excellent adsorption performance towards tetracycline with a removal rate above 80% in a wide pH range of 4–10, which was much higher than that of individual MgO and mesoporous SiO 2 . The nanocomposite possessed higher specific surface area (356.02 m 2 g −1 ) and smaller MgO particles compared with pure MgO (81.02 m 2 g −1 ), which can provide more active sites, thus enhancing the adsorption performance towards tetracycline. The electrostatic interaction and inner-sphere complexation between nanocomposites and tetracycline molecules were considered to play important roles in the adsorption process of tetracycline. The as-synthesized nanocomposites as promising adsorbents have a potential application in the removal of antibiotics from aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Jinsong Zeng,Tianguang Wang,Zheng Cheng,Lu Liu,Fugang Hu
A cellulose nanofiber-SiO2 hybrid aerogel cigarette (CSG) filter, which can be used for ultrahigh adsorption of toxic substances from cigarette smoke, was prepared based on the skeletal material of cellulose nanofibers (CNFs) with the help of a simple directional frozen technology. SEM and FTIR results confirmed the successful introduction of the SiO2 nanoparticles, and the application process of SiO2 nanoparticles did not influence the three-dimensional network structure of CSGs. Considering the practical application of the CSGs on the cigarette filter, the mechanical and thermal properties of the CSGs were investigated. The stress–strain and TG curves showed that the mechanical and thermal stability properties of the CSGs increased compared with the pure cellulose nanofiber aerogel without the introduction of SiO2 nanoparticles. The adsorption capacity of the CSG filter tips against toxic substances from cigarette smoke was systematically investigated. Compared with conventional cellulose acetate filter tips, the CSG filter tips performed well at adsorption of tar, TPM (total particulate matter), nicotine, and CO from cigarette smoke with removal efficiencies of 92.23, 90.25, 95.02, and 20.63%, respectively. Crucially, the preparation of CSGs needs no extra chemical agents, showing an eco-friendly process. These results suggest that CSGs display great potential working as an ideal candidate for mainstream smoke toxicant adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yuxuan Zhao,Yueli Wen,Xiaonuo Xu,Maohong Fan,Shiyun Guo,Zhiju Chen,Xiaoxiao Zhao,Bin Wang,Wei Huang
The heavy metals discharged from electroplating wastewater, represented as copper and chromium ions, is harmful to aquatic lives and human beings, and will break the ecological balance. In this work, magnetic hybrid porous structure adsorbent of Fe 3 O 4 @SiO 2 -UiO-66-EDTA is prepared for recycling copper and chromium ions. The adsorbent exhibits a maximum adsorption capacity of 212.10 mg/g for Cu(II) and 118.10 mg/g for Cr(VI). Notably, it shows excellent regenerability of 87.12% after 5 cycles. The adsorption of Cu(II) and Cr(VI) on Fe 3 O 4 @SiO 2 -UiO-66-EDTA follows the pseudo-second-order model, where chemical adsorption is dominant and it occurs spontaneously and exothermally. Based on XRD, FTIR, XPS, and DFT calculations, the adsorption mechanisms are driven by electrostatic attraction, chelation, and redox reactions. This work provides a novel and promising strategy for designing highly efficient adsorbents, paving the way for more effective treatments of electroplating wastewater contaminated with Cu(II) and Cr(VI).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Zhukang Bai,Yadong Wu,Jun Li,Shun Wang,Xuqiang Peng,Huile Jin
To attain the high dispersion and strong interfacial bonding of TiO 2 in fluororubber (FKM), a novel “core–shell” structured SiO 2 @TiO 2 nanofillers was designed and synthesized by in-situ polymerization and grafting modification method. For the “core–shell” structured SiO 2 @TiO 2 nanospheres , the rough and irregular silica shell can improve the surface area of the SiO 2 @TiO 2 filler and realize the mechanical riveting with the FKM, which shows a significant mechanical properties enhancement function. Compared with the pristine FKM, the tear strength , tensile strength , hardness, modulus at 100% strain, modulus at 300% strain, and storage modulus at −100 °C of FKM/SiO 2 @TiO 2 enhanced by 42.4%, 196.9%, 10%, 24.4%, 66.7%, and 15.5%, respectively. The sample’s electrical, thermal, and color properties were also improved and showed the highest haze and lowest light transmissions. Such a simple and effective method of preparing “core–shell” structured SiO 2 @TiO 2 nanofillers provides great potential in industrial applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITE INTERFACES
·
2021
·
IF 2.952
Bin Xu,Chenghua Chen,Enpei Ma,Zhenghuang Wei,Xiaoqing Li
In this study, SiO2/polymer co-coated colored aluminum pigment was prepared by sol-gel method and atom transfer radical polymerization technique. The results of scanning electron microscope (SEM) and transmission electron microscope (TEM) analysis showed that there was a coating layer with the thickness of about 500 nm on the surface of the pigment. X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FT-IR) analysis revealed that the coating layer of the pigment contained SiO2 and polymer of 2-(Dimethylamino)ethyl methacrylate (DMAEMA), indicated that SiO2 and the polymer were successfully coated on the surface of the aluminum powder. Moreover, the co-coated layer of SiO2 and the polymer can effectively prevent the contact between the aluminum powder and the corrosive medium, thereby exhibiting excellent corrosion resistance. In addition, the prepared pigment was made into a pigment paste in a certain ratio and uniformly coated on a polyester fabric, its UPF value was 93.03, which revealed that the coated fabric has excellent ultraviolet protection properties.
研究领域:
材料科学
·
纺织工程
·
表面化学
✓ 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）