COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2014
·
IF 2.354
Yaohui Xu,Yang Zhou,Ruixing Li
An available route was provided for simultaneous detection and effective adsorption toward Cd 2+ , Zn 2+ and Cu 2+ . The magnetic Fe 3 O 4 @SiO 2 nanoparticles were prepared and functionalized with N-(quinoline-8-yl)-2-(3-triethoxysilyl-propylamino)-acetamide (QTPA) by first using the “grafting from” method, which made the whole process of surface modification on Fe 3 O 4 @SiO 2 nanoparticles simpler and more effective. The as-synthesized QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles exhibited different fluorescence responses for Cd 2+ (doderblue), Zn 2+ (deepskyblue) and Cu 2+ (tomato red) illuminated under a 365 nm UV light, while other ions, such as Ag + , Hg 2+ , Ni 2+ , Co 2+ , Mn 2+ , Pb 2+ , Cr 3+ and Fe 3+ , gave no visible changes under identical experimental conditions. The eye-perceived fluorescent changes only toward Cd 2+ , Zn 2+ and Cu 2+ could serve as the available proofs for the qualitative analysis of the three cations. The UV–vis spectra results showed that the multifunctional nanoparticles exhibited fluorescence enhancements for Cd 2+ and Zn 2+ , and fluorescence quenching for Cu 2+ . The adsorption experiments showed that the nanomaterial was a good candidate for selective removal and enrichment of Cd 2+ , Zn 2+ and Cu 2+ , and had the high adsorption efficiency toward Cd 2+ (95.29%), Zn 2+ (92.37%), and Cu 2+ (91.06%). Moreover, the functionalized composites had strong magnetic sensitivity, which could make them susceptible in an external magnetic field, and easy to separate from the solid and liquid phase. More specific to this work, simultaneous fluorescence determination of Cd 2+ , Cu 2+ , and Zn 2+ by naked eye was proposed based on QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2014
·
IF 0.987
Shuhua Zhong,Huaili Sha,Yu He,Gongwu Song
In this work, tobermorite/SiO2/Fe3O4 composites were designed and synthesized by hydrothermal method for the treatment of phosphorus in wastewater. The composites were characterized by scanning electron microscopy and X-ray diffraction. The removal efficiency of phosphorus on the tobermorite/SiO2/Fe3O4 composites was carried out and investigated under various conditions, such as contact time, sorbent content, and pH. After the multi-run experiments, the phosphorous elimination of the tobermorite/SiO2/Fe3O4 composites was declined slightly comparing with the first-run experiments. Compared with the conventional crystallization methods, tobermorite/SiO2/Fe3O4 composites not only gave high efficiency to remove phosphorus from wastewater without any complicated pretreatment, but also provided excellent magnetic properties for separating the phosphorus from water, which made it easy recycled. Moreover, tobermorite/SiO2/Fe3O4 composites had excellent P-elimination properties even in the strong acidic or basic conditions. Therefore, tobermorite/SiO2/Fe3O4 composites were important candidate for water quality control and protection.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Chenlu Xue,Haipeng Jiang,Chenchen Zhu,Wei Gao
AlH 3 is a promising hydrogen storage material, but poses an explosion risk when suspended in air. Herein, a low-cost and environmentally friendly composite explosion suppressant is prepared using ultrasound coupled cooling crystallization and applied to suppress AlH 3 explosions. Ultrasound-induced cavitation inhibits crystal agglomeration, resulting in fine KH 2 PO 4 crystals growing on the SiO 2 surface by heterogeneous nucleation, which significantly improves the suppression effect. The decomposition products of KH 2 PO 4 react with the flame radicals in the system to generate stable products, interrupting the chain reaction of flame radicals effectively. Furthermore, the complex mesoporous structure of SiO 2 absorbs flame radicals and increases the collision probability between the radicals and the pore walls, thus suppressing flame propagation. Our research provides an important theoretical support for the safe application of light metal hydrogen storage materials.
研究领域:
材料科学
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能源存储
·
安全工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yang Guo,Haipeng Lu,Xian Jian
Corrosion is a major challenge for the reliable operation of ferromagnetic absorbers (FMAs) in extreme environments. Herein, we employed a one–pot method to construct SiO 2 –modified (3–Aminopropyl)trimethoxysilane (APTMS) nanocoatings on the FeNi surface, using tetraethyl orthosilicate and APTMS as precursors. The resulting APTMS/SiO 2 nanocoating (thickness: 12.0–29.3 nm) contained numerous –NH 2 and –OH functional groups, contributing to the generation of dipole polarizations. The nanocoating also improved the interfacial polarization and the impedance matching of FeNi@APTMS/SiO 2 , enhancing its microwave absorption (MA) properties. At 2.00 mm, FeNi@APTMS/SiO 2 exhibited a maximum effective absorption bandwidth of 9.23 GHz, outperforming FeNi's 8.01 GHz. Moreover, the radar cross–section value of FeNi@APTMS/SiO 2 reached as high as 27.84 dB·m 2 . Moreover, the nanocoating acted as a barrier to isolate the FeNi from the corrosive medium and prevent the formation of corrosive microcells with NaCl solutions, increasing the corrosion resistance of FeNi. The corrosion rate of FeNi@APTMS/SiO 2 was measured at 4.71 × 10 –11 m/s, which was 5.81 times lower than that of FeNi. This research highlights the advantages of APTMS/SiO 2 for MA and corrosion protection, offering valuable insights into the development of corrosion–resistant FMAs.
研究领域:
材料科学
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腐蚀与防护
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2018
·
IF 0
Zhejian Wu,Rong Chen,Qimao Gan,Jian Li,Tuqiao Zhang,Miaomiao Ye
Mesoporous Na + SiO 2 spheres with large surface areas, high porosities and tunable Na + contents have been synthesized by the Stöber method followed by the “polyvinylpyrrolidone (PVP)-protected NaOH etching” process. With the surface protection of PVP, the NaOH etching preferentially occurs inside the SiO 2 spheres results in the increase of the surface areas and porosities of the SiO 2 spheres while keeping the sphere size unchanged at the etching degree less than 50%. The surface area and pore volume of the selected Na + SiO 2 spheres with etching degree of 50% are 302.9 m 2 /g and 0.946 cm 3 /g, respectively, which are 31 times and 59 times higher than that of the SiO 2 spheres without NaOH etching. The Na + SiO 2 spheres with etching degree of 10% calcined at 400 °C shows high adsorption activity for Cr 3+ removal from different natural waters such as tap water, lake water and river water. The adsorption kinetic of Cr 3+ by the Na + SiO 2 spheres fits well with the pseudo-second-order model, and the adsorption isotherm can be fitted by the Langmuir adsorption isotherm. The maximum adsorption capacity of 10% Na + SiO 2 400 for Cr 3+ is 33.18 mg/g. Finally, it has been confirmed that the ion-exchange between Na + and Cr 3+ plays the leading role in the adsorption process while the contribution from static adsorption is relatively weak.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Ting-Sheng Chen,Di Liu,Yun-Jie Li,Xing-Bao Wang,Chang-Hai Liang,Zhen-Yi Du,Wen-Ying Li
Controlling the oxygen-free product selectivity in catalytic hydrodeoxygenation is essential for producing high quality fuels from coal- and biomass-derived crude liquids. A series of boron-doped Ni/SiO 2 catalysts were prepared for the efficient hydrodeoxygenation of dibenzofuran as a model compound. Boron doping significantly promoted the transformation of 2-cyclohexylcyclohexanol, which was accumulated as the main oxygen-containing intermediate compound on the pristine Ni/SiO 2 catalyst, to the target products bicyclohexane and its isomer cyclopentylmethylcyclohexane. Characterization results show that boron doping increases Ni dispersion, modifies the electronic properties of Ni sites and in situ generates Brønsted acid sites by H 2 spillover to boron oxides. The reduced Ni particle size improves the rates of dibenzofuran hydrogenation and 2-cyclohexylcyclohexanol dehydration. Electron-deficient Ni and boron oxides as the Lewis acid sites enhance the adsorption of 2-cyclohexylcyclohexanol. Furthermore, the in situ generated Brønsted acid sites favor the dehydration of 2-cyclohexylcyclohexanol, which gives the Ni-5B/SiO 2 catalyst a better deoxygenation activity than the mechanical mixture of equal amounts of 5B/SiO 2 and Ni/SiO 2 , as well as the one with a smaller Ni particle size of 3.8 nm.
研究领域:
催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
Biomimetics
·
2022
·Vol. 7
·期 4
·248
·
IF 3.743
Pan Cao,Huming Wang,Mingyi Zhu,Yifeng Fu,Chengqing Yuan
Any surface immersed in sea water will suffer from marine fouling, including underwater sound absorption coatings. Traditional underwater sound absorption coatings rely heavily on the use of toxic, biocide-containing paints to combat biofouling. In this paper, an environmentally-friendly nanocomposite with integrated antifouling and underwater sound absorption properties was fabricated by adopting MWCNTs-COOH and SiO2into PDMS at different ratios. SEM, FTIR and XPS results demonstrated MWCNTs were mixed into PDMS, and the changes in elements were also analyzed. SiO2nanoparticles in PDMS decreased the tensile properties of the coating, while erosion resistance was enhanced. Antibacterial properties of the coatings containing MWCNTs-COOH and SiO2at a ratio of 1:1, 1:3, and 1:5 reached 62.02%, 72.36%, and 74.69%, respectively. In the frequency range of 1500–5000 Hz, the average sound absorption coefficient of PDMS increased from 0.5 to greater than 0.8 after adding MWCNTs-COOH and SiO2, which illustrated that the addition of nanoparticles enhanced the underwater sound absorption performance of the coating. Incorporating MWCNTs-COOH and SiO2nanoparticles into the PDMS matrix to improve its sound absorption and surface antifouling properties provides a promising idea for marine applications.
研究领域:
材料科学
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海洋工程
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环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Liwei Shen,Guosheng Ai,Yiling Ao,Guanxin Zeng,Ying Yang,Xuening Feng,Zejun Zhang,Huaikui Yuan,Fan Ye,Yuanzhu Mi
Water-in-oil emulsions are frequently encountered in petroleum extraction. In this paper, CRB-SiO 2 , a cost-efficient and environmentally friendly demulsifier, was synthesized by a two-step method. The chemical structure and surface morphology were analyzed by flourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM), respectively. The effect of salinity, concentration, temperature and pH value on the demulsification efficiency (DE) was investigated in detail. The DE reached 93.98% with 600 mg/L of CRB-SiO 2 at 70 °C. Also, it had an excellent tolerance of salt, acid and alkali. Moreover, the demulsification mechanism was also studied through three-phase contact angle, interfacial tension and self-assembly of interfacial membrane. CRB-SiO 2 has an amphiphilic structure and lower interfacial tension (IFT) around 37.75 mN/m. Accordingly, it can be easily adsorbed at the water-oil interface, destroying the interface membrane and initiating the separation of oil and water. In summary, CRB-SiO 2 has a potential application in petrochemical industry.
研究领域:
石油化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Tianguan Wang,Xiankang Zhong,Zhi Zhang,Xi Yuan,Li Zhou,Ziqi Zheng,Abdolreza Farhadian,Junying Hu
Asphaltene precipitation could have several negative consequences, including production decline, wellbore plugging, and even severe safety concerns. Therefore, an effective strategy of asphaltene adsorption is highly significant. Nanoparticles possess a large surface area, showing a high adsorption potential for asphaltene. However, the self-aggregation property limits its adsorption capacity. In this work, the Co 3 O 4 nanoparticles were ingeniously selected as an inhibitor of asphaltene precipitation, and a porous SiO 2 film was formed via the sol-gel method. The evaluation experiments indicated that the SiO 2 film significantly reduced the self-aggregation. Hence, the specific surface area of nanoparticles increased from 20.87 m 2 /g to 29.25 m 2 /g. Meanwhile, molecular dynamics simulations confirmed that the modified nanoparticles exhibited 1.6 times higher adsorption energy and a lower mean square displacement than the fundamental nanoparticles. With these improvements, the Co 3 O 4 -SiO 2 nanoparticles developed greater stability and dispersion, which raised the adsorption of the nanoparticles on asphaltene from 1.24 mg/m 2 to 1.53 mg/m 2 , presenting a considerable adsorption capacity. This study broadens the selection of nanoparticles for asphaltene adsorption. It demonstrates the improvement of nanoparticles by porous SiO 2 film in various aspects, which can provide a solution for inhibiting asphaltene precipitation in oil fields as well as guidance for subsequent functionalization of nanoparticles.
研究领域:
石油工程
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yongkang Lu,Bo Zhang,Shaobo Liu,Luxia Yin,Wanghui Gong,Jianguang Gao,Zekai Zhang,Wensheng Ning
Pd/SiO2-n aerogel composites with different Si/Pd mole ratios (n(Si/Pd)) were synthesized by a sol–gel method followed by drying in the atmosphere to adsorb thiophenic compounds from model oils. For Pd/SiO2-n, doping Pd species in SiO2 aerogels led to the appearance of weak Lewis acidic sites on the surface. The adsorption capacity of Pd/SiO2-n was significantly higher than that of pure SiO2, owing to the π-complexation, S–M bonding, and acid–base interaction between Pd2+ and thiophenic compounds. Among them, the capacity of Pd/SiO2-318 was the highest, 4.76 mg S/gads (i.e., 9.37 μmol S/μmol Pd), which was obviously higher than that of sorbents reported such as Pd/activated carbon and Pd/Al2O3, based on the amount of thiophene adsorbed per unit active centers. In the presence of aromatics and olefins, the selectivity of Pd/SiO2 for thiophene was higher than that of Ag/SiO2 and Cu/SiO2 reported, attributed to the stronger S–Pd bonding than the S–Ag and S–Cu bonding. The equilibrium adsorption data of thiophene onto Pd/SiO2-318 were well simulated with the Langmuir and Freundlich models. Combined with thermodynamic results, it can be found that the low temperature was favorable for the adsorption of thiophene. Pd/SiO2 exhibited a good regeneration performance after solvent washing.
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
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Le Zhang,Rui Li,Hao Ding,Daimei Chen,Xuan Wang
Coatings with superamphiphobicity and photocatalytic degradation properties to achieve excellent self-cleaning performance have received extensive attention. Herein, TiO 2 -SiO 2 composite particles with micro-/nanoscale hierarchical structures were fabricated by hydrophobic agglomeration. The TiO 2 -SiO 2 was modified with 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (PFDTS), and then it was sprayed onto the surfaces of substrates to obtain TiO 2 -SiO 2 /PFDTS coatings. The coating surface exhibited superamphiphobicity and low adhesion properties. The contact angles (CAs) of water, ethylene glycol, glycerol, and hexadecane on the coating surface were 163.5°, 154.6°, 157.3°, and 150.2°, respectively. The slide angles (SAs) of the above droplets on the coating surface were 0.4°, 2.7°, 1.6°, and 11.1°, respectively. In addition, 80.9 % methyl orange solution (10 ppm) was degraded by the TiO 2 -SiO 2 /PFDTS under UV irradiation in 60 min, demonstrating an excellent photocatalytic degradation performance. It also had good adaptability to different substrates, liquids with different properties, and outdoor environments. The results of a mechanistic study showed that SiO 2 and TiO 2 were connected by the carbon chains of modifiers. PFDTS and TiO 2 -SiO 2 might be combined by chemical bonds or surface carbon chains. The hierarchical structure of TiO 2 -SiO 2 and the low surface energy of PFDTS resulted in the superamphiphobic property of the TiO 2 -SiO 2 /PFDTS coating.
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
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·
IF 2.8
Chenwei Liu,Ran Jing,Yue Li,Daolai Sun,Jianhua Lv
Background Succinic acid is a vital platform chemical derivable from lignocellulosic biomass. Various non-noble metal catalysts were used to hydrogenate succinic acid and produce 1,4-butanediol in this study. Among them, Co-loaded SiO 2 with a moderate mean pore size of 10 nm exhibited a superior catalytic performance. Results The high catalytic activity of Co-loaded SiO 2 , which was prepared by an impregnation method, was demonstrated in the hydrogenolysis of succinic acid to provide 1,4-butanediol. The Co/SiO 2 catalyst reduced at 400 °C and calcined at 300 °C existed in the form of Co 2+ and Co 0 , exhibiting a high catalytic activity. The production of 1,4-butanediol from succinic acid was significantly enhanced at a temperature of 200 °C and an H 2 pressure exceeding 5 MPa. At 200 °C and 7 MPa H 2 pressure, a 1,4-butanediol selectivity of 67.8% and a full succinic acid conversion were obtained over Co/SiO 2 . Conclusion The Co-loaded SiO 2 with a moderate mean pore size of 10 nm was conducive to the efficient generation of 1,4-butanediol from succinic acid. The Co/SiO 2 catalyst reduced at 400 °C existed in the form of Co 0 and Co 2+ . It was suggested that the efficient synthesis of 1,4-butanediol from succinic acid was facilitated by the cooperative action of Co 0 and Co 2+ . © 2024 Society of Chemical Industry (SCI).
研究领域:
化学工程
·
催化材料
✓ 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）