JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Han Zhang,Sijia Sun,Hao Ding,Ying Chen
Using amorphous SiO 2 (A-SiO 2 ) and tetrabutyl titanate (TBOT) as raw material, a composite photocatalyst with surface loaded quantum dot size TiO 2 (A-SiO 2 /TiO 2 , AST) was prepared. The degradation of tetracycline hydrochloride as well as mechanism of performance improvement by A-SiO 2 were investigated. The TiO 2 on the composite was anatase with a content of 9.96 wt% and a size of 7–8 nm (quantum dot level). TiO 2 was uniformly distributed and was closely bonded at the interface by chemical bonds. The degradation rate of AST was 95% after 60 min UV exposure, which was comparable to pure nano-TiO 2 . The particle size of TiO 2 in AST was reduced from 20–50 nm to 7–8 nm comparing with pure nano-TiO 2 and changed from a highly agglomerated to a well-dispersed state due to abundant hydroxyl groups on A-SiO 2 surface. TiO 2 bandgap width increased from 3.25 eV to 3.39 eV. These led to the exposing of active sites on TiO 2 and significantly increased photogenerated carrier separation efficiency. This study provides a feasible and simple method to improve TiO 2 nanoparticles’ photocatalytic activity, reduce the usage and achieve recycling to cut the application cost by surface coated.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 7
·1145
·
IF 3.4
Shuanqiang Yang,Zhenzhen Jia,Jinjia Xu,Ruoyu Hong
High-performance coating could be used to protect steels in engineering. The GPTMS-TEOS hybrid coatings were successfully prepared using (3-glycidoxypropyl) trimethoxysilane (GPTMS) and tetraethylorthosilicate (TEOS) as reaction raw materials and diethylenetriamine (DETA) as both a curing agent and catalyst at room temperature. The hybrid coating contained amorphous SiO2and was characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The DETA content of the hybrid coating has a significant impact on the performance of the coating. As the DETA content increases, the thermal stability of the hybrid coating increases at 400–600 °C due to the production of more SiO2in the amine-rich state. However, the gelation time decreases dramatically, preventing the hybrid coating from better infiltrating the surface of the steel substrate. In addition, there are not enough silicon hydroxyl groups to bond with the hydroxyl groups on the surface of carbon steel and adhesion is significantly reduced. Therefore, hybrid coatings with a moderate DETA content (NH:epoxy ratio equivalent to 1:1) show the best corrosion resistance, with a third-order magnitude increase in corrosion resistance compared to that of carbon steel.Keywords:GPTMS-TEOS;hybrid coatings;amorphous SiO2;anti-corrosion coatings
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jie Zhu,Sifan Wang,Jiaji Zhang,Zhecheng Fang,Weitao Ji,Gaobo Lin,Lei Guo,Bolong Li,Jianghao Wang,Jie Fu
Constructing a stable Cu 0 /Cu 2+ interface is critical for enhancing the C-C coupling during the process of CO 2 electroreduction. However, the high-valence Cu species are unstable under the operating conditions. Herein, polyhedral-shaped CuO is coated with hydroxy-rich SiO 2 nanoparticles (m-SiO 2 /CuO) to stabilize the Cu 2+ species, enabling efficient CO 2 reduction to the ethylene product. Significantly, the optimal m-SiO 2 /CuO catalyst exhibits an impressive Faradaic efficiency of 55.5 % and an industrial-level partial current density of 500 mA cm −2 toward ethylene. Fourier transform infrared spectra and X-ray photoelectron spectra reveal that the strong interfacial interaction between CuO and hydroxy-rich SiO 2 is conducive to stabilizing the Cu 2+ species. In-situ characterizations reveal that the Cu 0 /Cu 2+ interface facilitates CO 2 activation and the key intermediate *OCCHO, thus promoting the production of ethylene. This work paves the way for developing advanced electro-catalysts of producing ethylene.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2017
·Vol. 33
·期 9
·1219-1225
·
IF 1.673
Linmin Cao,Jilin Huang,Zhipeng Lin,Xiang Yu,Xiaoxian Wu,Bodong Zhang,Yunfeng Zhan,Fangyan Xie,Weihong Zhang,Jian Chen,Hui Meng
This work designed a facile preparation for an SiO2/C composite as the anode material for lithium ion battery. Both SiO2 and carbon are amorphous. SiO2 and carbon are mixed uniformly. The SiO2/C composite shows high specific capacity, cycle stability, and rate capability in lithium ion battery charge–discharge test. A stable reversible capacity of 1024 mA h/g at the current density of 100 mA/g is reached. The capacity retains 83% after 100 cycles. The uniform mixture of SiO2 and carbon leads to reduced volume change during the lithiation and delithiation of SiO2, together with the amorphous nature of SiO2 explains the high cycling stability. The carbon coating is a key factor for the high capacity and stability due to the increased electrical conductivity and reduced volume change. The resistance of the solid electrolyte interface film and charge transfer resistance of the SiO2/C composite are much smaller than those of pure carbon, which is a direct proof of the improved conductivity of the material by the carbon coating.
研究领域:
材料科学
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能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yuqing Pan,Na Li,Shiyuan Ran,Du Wen,Qinlan Luo,Ke Li,Qulan Zhou
Efforts have been devoted to exploring the effective composite catalysts for low-temperature selective catalytic reduction of NOx by CO (CO-SCR) using Fe-Cu bimetal oxide (Fe2Cu1) as the active component and rice husk ash (RHA), amorphous SiO2, and activated carbon (AC) as supports. The results showed that the beneficial role of RHA as a catalyst support for CO-SCR was primarily reliant on amorphous SiO2 in RHA and not on AC. Both Fe2Cu1/RHA and Fe2Cu1/amorphous SiO2 catalysts exhibited the best catalytic performance of CO-SCR, which had good stability, wide active temperature range, high conversion ratio, 100% N2 selectivity, and superior resistance to O2, SO2, and H2O (g). The CO and NOx conversion ratios of Fe2Cu1/amorphous SiO2 could reach up to approximately 100% from 100 to 500 °C. The excellent SCR performance was associated with the large specific surface area and good structural stability of amorphous SiO2, the uniform distribution of active sites, dual redox cycle of Fe2O3 and CuO species, and many surface-adsorbed oxygen species, which made amorphous SiO2-based catalysts highly competitive for application in the SCR process. This research provides the underlying insights for the improvement of industrial application to realize ″non-ammonia SCR″ technology with near-zero NOx/CO emissions synergistically at low temperatures.
研究领域:
环境科学
·
催化化学
✓ 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）