JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
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IF 2.752
Hongji Li,Yan Wang,Yue Li,Jinyue Zhang,Yu Qiao,Qingwei Wang,Guangbo Che
As a sensitive analytical technique, surface-enhanced Raman scattering (SERS) is widely used in spectral analysis, single molecule detection and biological/chemical sensors. Noble-metal nanostructures have sensitive SERS properties and usually act as SERS substrates. Moreover, semiconductors also possess SERS properties and when the semiconductors are combined with noble metals this can not only enhance the SERS signal but also introduce additional properties. Therefore, in this investigation, SiO 2 @TiO 2 @Ag composite materials are selected as SERS substrates, which not only increase the SERS property of substrates but also introduce the property of self-cleaning under conditions of UV light . The molecularly imprinted technique (MIT) is combined with SERS in this investigation to improve the disadvantage of traditional SERS substrates having low selectivity . Molecularly imprinted polymers (MIPs) have specific adsorption properties that can enrich the templates on the surface of SiO 2 @TiO 2 @Ag composites. Importantly, the MIPs can prevent the SERS substrate being oxidized, which effectively protects the core materials. Hence, SiO 2 @TiO 2 @Ag@MIPs is synthesized based on SERS and MIT for used in pyrethroid detection. The Raman intensity and fenvalerate concentration show a good linear relationship in the FE range of 1.0–100 nmol l −1 and the detection limit is 0.2 nmol l −1 . Furthermore, the SiO 2 @TiO 2 @Ag@MIPs present good selectivity and self-cleaning. This investigation provides a novel approach to pyrethroid detection.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Wei Liu,Daoyin Liu,Hongjian Tang,Zhenkun Sun,Lunbo Duan
Synthesis of efficient photocatalysts is essential for the removal of antibiotic-based contaminants from wastewater. In this work, novel Z-scheme (SiO 2 /TiO 2 )/Bi 2 WO 6 (SiTiBi) heterojunction photocatalysts are synthesized by atomic layer deposition and hydrothermal methods, and the photocatalytic performance is improved by constructing oxygen vacancies and internal electric field (IEF). 15-SiTiBi (15 wt% SiO 2 /TiO 2 ) exhibits excellent photocatalytic activity, with 89 % LVF degradation in 30 min and a degradation kinetic constant of 0.072 min −1 . In addition, based on free radical trapping, electron spin resonance, photoelectrochemical tests, and DFT calculations, show that oxygen vacancies enhance the light absorption, and IEF strengthens the separation and migration of photogenerated carriers. Finally, the degradation intermediates and degradation pathways of LVF are predicted using LC-MS and first-principles. This work provides an effective method for constructing interfacial structures that facilitate the separation of photogenerated carriers and promote antibiotic degradation.
研究领域:
环境科学
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材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Bin Xu,Maohua Hou,Qinqin Xu,Jieying Su,Haitao Zhang,Xiaohui Lu,Zhongjin Ni
In recent years, artificial amorphous photonic structure (APS) materials with high color saturation and angle independence have been competitively reported. However, there is a lack of research into their functionalization and application in practical environments. Here, with practical applications in mind, we prepared APS pigments based on CB@SiO2@TiO2 core–bishell nanospheres and demonstrated high color saturation, enhanced color stability, and excellent photocatalytic activity. SiO2 effectively protected the carbon black particles from ablation during the calcination process. Paints composed of ethanol, ethyl cellulose (EC), and pigments could be spray-coated on any substrate to prepare a structurally colored coating without limitation. The coatings show good mechanical stability and photothermal stability. The color of the structurally colored pigments can be easily changed by adjusting the sizes of the CB@SiO2@TiO2 nanospheres. The photocatalytic activity of the pigments on formaldehyde (HCHO) and methylene blue (MB) solution and reaction kinetics of their degradation were studied by experiment. The results showed that the photocatalytic activity of the pigments increased with the increase of the TiO2 loading, and the degradation rate of HCHO reached 96.7% for 3 h and that of MB reached 97.9% for 60 min when the TiO2 shell thickness was 40 nm. The structurally colored pigments based on CB@SiO2@TiO2 nanospheres effectively solve the environmental problems caused by the application of pigments and have a promising future in the fields of color decoration, display, and painting.
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产品关联
DOI
PubMed
高影响因子
iScience
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2023
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IF 5.8
Chengcheng Suo,Wei Li,Sha Luo,Chunhui Ma,Shouxin Liu
Summary Photocatalytic depolymerization is a high value-added approach for utilization of lignin. In this study, magnetic microspheres of FeCoRu@SiO 2 –TiO 2 were synthesized by a co-precipitation method. Doping with CoO x and RuO x was used to improve the response to visible light, and doping with TiO 2 was used to improve the response to ultraviolet light ( λ < 380 nm). The lignin model compound depolymerization rate was >90%. The electron paramagnetic resonance results showed that the reaction occurred in two steps (aerobic phase and oxygen-free phase). Most of the O 2 − was produced in the first step by cleavage of C-O bonds. The second step was inhibited in an oxygen-free atmosphere. This research provides a valid method for enhancing the photocatalytic properties using full-spectrum light and exploring the lignin photocatalytic depolymerization mechanism. Further research is required to develop the catalyst properties and performance to produce radicals.
研究领域:
化学
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材料科学
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环境科学
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催化
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Cong Liu,Yanhui Li,Qian Duan
A novel hybrid organic/inorganic magnetic and thermal dual-responsive core-shell green photocatalyst zinc-tetracarboxyl-phthalocyanine- g -Fe 3 O 4 @SiO 2 @TiO 2 - g -poly( N -isopropyl acrylamide) had been prepared. Firstly, Fe 3 O 4 @SiO 2 @TiO 2 (FST) was prepared with core-shell structure, then thermosensitive poly( N -isopropylacrylamide) (PNIPAM) immobilized on the surface of 3-(methacryloxypropyl)-trimethoxysilane (MPS) modified FST by radical polymerization. Below the lower critical solution temperature (LCST), PNIPAM was hydrophilic to ensure them disperse uniformly in aqueous solution, and above LCST, PNIPAM became hydrophobic to accelerate the separation of FST from water. Secondly, zinc-tetracarboxyl-phthalocyanine (ZnTcPc) grafted on the surface of FST- g -PNIPAM by ester bonds and sensitized TiO 2 to broaden absorption light range from ultraviolet to visible region to enhance photocatalytic activity. The photocatalytic test revealed that the decomposition rate of Rhodamine B (RhB) came to 91.8% after 60 min with ZnTcPc- g -FST- g -PNIPAM under visible light. When exposed under sun light, the degradation efficiency reached to 96.9%. It meant ZnTcPc- g -FST- g -PNIPAM was more suitable for organic pollutant degradation in nature. In addition, ZnTcPc- g -FST- g -PNIPAM performed efficient synergistic effect of thermal (>LCST) and magnetic responded recovery for reusing. And the degradation rate of RhB under recyclable photocatalyst was reduced 9.6% after 4 cycles. Above all, ZnTcPc- g -FST- g -PNIPAM would be an efficient photocatalyst with magnetic and thermal dual-responsive recovery used in water treatment.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Zhongren Zhou,Peng Dong,Deyu Wang,Meng Liu,Jianguo Duan,G.P. Nayaka,Ding Wang,Cunying Xu,Yixin Hua,Yingjie Zhang
In this paper, a facile metallurgical method named molten salt electrolysis was introduced to synthesize silicon-titanium nanocomposite that was used as the anode for lithium-ion batteries (LIBs). Simply utilizing SiO 2 and TiO 2 mixture as the raw materials, upon the direct electrolysis in the molten salt chamber, the oxide precursor was reduced constantly to the complete production of silicon-titanium nanocomposite. Benefiting from the compositional and structural advantages of sample, the as-obtained silicon-titanium anode delivered enhanced reversible specific capacity and good cycling stability such as the initial discharge capacity of 1410.5 mAh g −1 with the columbic efficiency of 80.72% and reversible 638.1 mAh g −1 with a high retention of 92.2% just after the anode cycling for 50 times. The average specific capacity fading percentage was only 0.16% per cycle between the 4 th to 50 th cycles, the result of which showed a good electrochemical performance for lithium ion storage.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Qi Jiang,Jian Huang,Baoguo Ma,Zhengcai Yang,Ting Zhang,Xin Wang
TiO 2 @SiO 2 composite microspheres (TS) were prepared by the deposition of TiO 2 on the raspberry-like SiO 2 @polystyrene microspheres (PSS). The hollow microspheres with hierarchical microtopography possess both improved photocatalytic activity and stabilized TiO 2 particle structure. The results of energy dispersion spectrum (EDS) mapping, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) showed that after calcination, anatase TiO 2 nanoparticles has formed on the raspberry-like PSS template with preferred deposition among interstitials of the drupelet-like structure. The thermal degradation of the polystyrene (PS) core during calcination led to the hollow microspheres. The photocatalytic experiments indicated that the raspberry-like TiO 2 @SiO 2 composite microspheres (TS1-TS3) had higher photocatalytic efficiency than the smooth ones (TS0), due to the hierarchical and hollow structure. The sample TS2 prepared with a moderate ammonia concentration (3 %) not only had relatively more intact hollow spherical structure, but also enhanced photocatalytic activity. The hollow TiO 2 @SiO 2 composite microspheres (TS3) prepared with 4 % ammonia showed the best photocatalytic efficiency. However, the higher ammonia concentration made the drupelet-like structure unstable and the microspheres tend to disintegrate. The raspberry-like microstructure showed a protective effect on the loaded TiO 2 , which resulted in better recyclability with persistent photocatalytic activity. The hierarchical composite microspheres shed light on the potential effective utilization strategy of nano-photocatalyst.
研究领域:
材料科学
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化学
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纳米技术
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环境科学
✓ 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）