APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Jing Hu,Haiqiang Wang,Fan Dong,Zhongbiao Wu
Photothermal effect was for the first time utilized to capture the energy from infrared light and to promote the photocatalytic oxidation activity of NO by a simply mechanical mixing of traditional photocatalysts and core-shell structured Fe 3 O 4 @SiO 2 . Fe 3 O 4 @SiO 2 absorbed the infrared light, transferred it into thermal energy based on photothermal effect, which then accelerated the NO photocatalytic activity of traditional photocatalysts. This promotion effect led by the addition of Fe 3 O 4 @SiO 2 was confirmed by several classical photocatalysts such as TiO 2 , g-C 3 N 4 , BiOI and CeO 2 . To quantitatively characterize the photothermal effect, thermo images were taken with a thermo imager to obtain the average temperature rise of samples under the illumination of simulated solar light. Specially, P25/Fe 3 O 4 @SiO 2 was studied in depth for illustration of the promotion mechanism. Experimental results showed that with the contribution of SiO 2 shell, the photocorrosion of Fe 3 O 4 didn’t occur during photocatalytic oxidation process and the photothermal effect of Fe 3 O 4 was maintained. The quantity of Fe 3 O 4 @SiO 2 was a vital factor for promotion of photocatalytic activity and the optimum mass ratio of P25 and Fe 3 O 4 @SiO 2 was 3–1. After 120 min of illumination, the temperature of optimum P25/Fe 3 O 4 @SiO 2 rose to 57.4 °C from 25 °C and its NO conversion capability showed an enhancement of 38.9% with the comparison to pure P25. The experimental results confirmed that the rise of temperature was attributed to the photothermal effect and its contribution was the same as the directly heating of photocatalysts. Furthermore, the enhancement of NO conversion capability around 30–40% was observed for the Fe 3 O 4 @SiO 2 mixed anatase TiO 2 , g-C 3 N 4 , ZnO, BiOI and CeO 2 . In sum, we developed a new strategy for utilization of NIR light of solar energy to facilitate the photocatalytic reactions.
研究领域:
环境科学
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材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaoping Li,Xinpeng Wang,Lei Dong,Qing Zou,Chunlin He,Yanqiu Zhu,Toyohisa Fujita,Changzhong Liao,Cheng-Wei Kao,Ying-Rui Lu
As the main fission products of nuclear power plants, radioactive iodine isotopes are of great concern because of their great harm to public safety. In this work, a nanocomposite of bismuth sulfide coated with the electrospinning SiO2 nanofibers with a diameter of about 280 nm nanostructure-based membranes (Bi2S3@SiO2) was successfully prepared to dispose of gaseous iodine. Results showed that the adsorption capacity of Bi2S3@SiO2 for iodine can be up to 1180 mg g–1, which is higher than the commercial silver-exchanged zeolite (AgZ) and other bismuth-based adsorbents. Chemisorption is the major adsorption behavior of iodine capture. Thermogravimetric analysis results demonstrated that the Bi2S3@SiO2 nanocomposites were stable up to 300 °C before and after capturing iodine. X-ray diffraction results revealed that BiSI was initially formed and then transformed to BiI3. Scanning electron microscopy revealed that the sulfur element remains in the samples after interacting with iodine, and X-ray absorption near-edge spectra further confirmed that its oxidation states are a mixture of S0, S3+, and S6+. The oxidation states of bismuth and iodine are Bi3+ and I–, respectively, revealed by X-ray photoelectron spectroscopy. The reactions between Bi2S3@SiO2 nanocomposites and I2 vapor are as follows: I2 was reduced to be I– and the BiI3 crystalline phase is the final form; S2– in Bi2S3 was oxidized to higher valences (S0, S3+, and S6+), and amorphous phases are their final forms. The research results demonstrated that the nanostructure-based membranes prepared by this work would be a promising candidate nanomaterial for capturing iodine in the plant off-gas streams.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Fang-yan Chen,Min-keng He,Yu-bin Tang,Cheng-yi He,Ke-ke Shu,Ming-yang Li
A core-shell g-C 3 N 4 /SiO 2 nanocomposite was successfully synthesized by depositing g-C 3 N 4 , obtained from the sublimation of melamine and subsequent polymerization reaction in the gaseous phase, on the nano-silica. The as-prepared g-C 3 N 4 /SiO 2 was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N 2 adsorption–desorption, UV-vis diffuse reflectance spectroscopy. The visible-driven photocatalytic activity of g-C 3 N 4 / SiO 2 was evaluated by the degradation of tetracycline. The results indicate that the specific surface area of g-C 3 N 4 /SiO 2 is 97.32 m 2 /g, which is 6.74 times as high as that of bulk g-C 3 N 4 (14.44 m 2 /g). Compared to bulk g-C 3 N 4 , g-C 3 N 4 /SiO 2 composite exhibits significantly enhanced photocatalytic activity for degradation of tetracycline and can degrade 72.7% of tetracycline within 60 min under visible-light irradiation. The photodegradation rate constant of tetracycline over g-C 3 N 4 /SiO 2 is 7.2 times as high as that over bulk g-C 3 N 4 . The greatly enhanced photocatalytic activity of g-C 3 N 4 /SiO 2 is due to coupling enlarged surface areas with the contribution of SiO 2 in inhibition of the recombination of photo-induced electron-hole pair.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Jiabai Cai,Huan Li,Wenjia Huang,Shuting He,Kai Feng,Masaki Takaoka
Biogas slurry, an inevitable outcome of anaerobic digestion (AD), is a treatment burden for urban environmental management. In this study, two kinds of biogas slurry (slurry J and slurry C), collected from the AD plants in Japan and China, were treated using novel TiZrO 4 @Cu and TiZrO 4 @Cu@SiO 2 multilayered hollow spheres containing Cu sub-nanoclusters as the catalyst. The results showed that the chemical oxygen demand (COD) was removed by 63 % for slurry J and 44 % for slurry C after 5 h. The Cu sub-nanoclusters acted as co-catalysts and active centers, facilitating rapid electron transfer to oxygen molecules and forming highly reactive •O 2 − and •OH species (Use slurry J as the based solution). These free radicals cleaved the interconnecting bonds between benzene rings, disintegrated the ring structure, formed intermediate compounds such as n-hexylic acid, and ultimately mineralized organic pollutants in biogas slurry into CO 2 and H 2 O. At the same time, TiZrO 4 @Cu@SiO 2 had excellent stability due to the protection of the SiO 2 shell and reduced threefold Cu leaching than TiZrO 4 @Cu. The COD removal rate was always 60 % in six cycles in the slurry J. The new catalyst ensured the high performance of catalytic air oxidation at low temperatures, which has significant potential as an environmentally friendly and energy-saving method for organic wastewater treatment.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Bin Chen,Jun Hu,Zhihao Yu,Lin Zhu,Chunzheng Wu,Hongbo Yu
Improving catalytic hydrogenation by modifying noble metal catalysts with metal-oxide promoters is promising, but precisely controlling the metal–promoter interface to optimize performance is still challenging. In this study, we created Ir-SnO2/SiO2 nanocatalysts with different Ir/Sn ratios using IrSn alloy precursors through careful calcination and reduction treatments. The SnO2-promoted catalysts showed much better conversion and selectivity than the original Ir/SiO2 catalyst toward the hydrogenation of acetophenone to phenylethanol. The Ir-SnO2/SiO2 catalyst with an Ir/Sn molar ratio of 5/1 (i.e., sample Ir5-(SnO2)1/SiO2) performed the best, achieving a 94% conversion rate and 99% selectivity. Our study found that SnO2 promoters could reduce the surface electron density of the Ir nanoparticles (NPs), enhancing the adsorption of reactants; meanwhile, the new Ir-SnO2 interface is more active for the dissociation of hydrogen compared to Ir alone. The optimal Ir5-(SnO2)1/SiO2 catalyst has demonstrated versatility by effectively catalyzing the hydrogenation of C═O bonds in a wide range of compounds, showing significant potential for various industrial applications in fine chemical synthesis and energy conversion.
研究领域:
催化化学
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材料科学
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工业化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Haizhou Fan,Jingmao Zhao,Jingfan Zhang,Hongfei Li,Sheng Zhang,Jun Sun,Fei Xin,Fang Liu,Zuodong Qin,Wufei Tang
A multi-functional kaolinite-based compound (AST@Kaol) was prepared by successive loading of TiO 2 and SiO 2 to the surface of metakaolinite (Kaol), followed by reaction with γ-aminopropyl triethoxysilane (APTES). The hybrid was then introduced to epoxy resin (EP) to enhance flame retardancy, smoke suppression and anti-aging properties. The results demonstrated the presence of only 3 wt% AST@Kaol can increase the value of limit oxygen index (LOI) of EP composite to 27.3% from 25.3% of neat EP, as well as decrease the value of heat release rate , total smoke release and the smoke density by 36.9, 14.3 and 19.9%, respectively, compared to neat EP. Besides, the thermal stability and thermal oxidative resistance of EP composites was enhanced. The mechanism of fire retardancy, anti-ageing and mechanical of the EP composite containing AST@Kaol was also speculated.
研究领域:
材料科学
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防火材料
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高分子化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
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IF 3.057
Xiaodong Zhu,Fantao Kong,Xinsheng Ma
Li-added CaO-B 2 O 3 -SiO 2 (CBS) dielectric microwave substrates for low temperature co-fired ceramic (LTCC) applications were prepared using a solid-state reaction, and the effect of the LiF additive on the sintering behavior, dielectric performance and mechanical properties of the product was investigated. In this presently reported work, we found that the LiF additive could effectually reduce the sintering temperature of the CBS ceramics and also substantially improved the densification, dielectric and mechanical properties of it. The experimental results showed that an addition of 3 wt% LiF to the sample sintered at 790 °C resulted in a main crystalline phase of β-CaSiO3 which had excellent proprieties. These included an excellent degree of densification, ε r of 6.43, tan δ of 5.9 × 10 −4 and a volume resistivity of 8.20 × 10 11 Ω cm at 1 MHz, and flexural strength of 241 MPa.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2013
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IF 3.041
Haoxia Yu,Xiaofei Zhang,Yatao Zhang,Jindun Liu,Haoqin Zhang
SiO 2 @N-Halamine/polyethersulfone (PES) ultrafiltration membranes were prepared by phase inversion method. The morphology, hydrophilicity , permeation performance, porosity, antifouling and antibacterial properties of the membrane were investigated. FT-IR spectra, TEM and XPS spectra results showed that SiO 2 nanoparticles were prepared and modified successfully. SEM images indicated that the cross-section morphology of membrane was influenced by the introduction of SiO 2 @N-Halamine. The surface hydrophilicity of membranes was significantly improved after adding SiO 2 @N-Halamine. The filtration results indicated that the permeation properties of the hybrid membranes were significantly superior to the pure PES membrane. The water flux of the hybrid membranes increased with the additional amount of SiO 2 @N-Halamine increased, when the SiO 2 @N-Halamine content was 5%, the water flux of the membranes reached the maximum at 384.4 L·m − 2 ·h − 1 . Moreover, the hybrid membranes showed good antifouling and antibacterial properties, which might expand the usage of PES in water treatment and also could make some potential contributions to membrane antifouling.
研究领域:
材料科学
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环境工程
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yan-nan Wang,Jin Li,Zhenyu Yuan,Fanli Meng
An optical fiber toluene gas sensor working at room temperature is proposed based on CQDs@SiO 2 (-OH) porous film. The CQDs@SiO 2 (-OH) porous film was elaborated on the surface of the hollow core fiber (HCF) using the templating method, where the evanescent field is excited by a misaligned structure. The precursor solution formed by mixing CQDs with SiO 2 (-OH) enhances CQDs dispersion within the film, preventing aggregation and preserving active sites. Experimental results indicate that the gas-sensitive layer doped with CQDs demonstrates a sensitivity of 5.1 pm/ppm to toluene gas at room temperature, which is approximately 3.13 times greater than that of the SiO 2 (-OH) porous film. Additionally, it demonstrates a response time of 12 s and a limit of detection (LOD) of 3.9 ppm. The gas sensing mechanism is thoroughly investigated using DFT, exploring the electronic distribution of the gas-sensitive layer before and after CQDs doping and analyzing the sensitization mechanism. This study presents a novel approach for toluene gas detection at room temperature using an optical fiber sensor.
研究领域:
化学传感器
·
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Xintao Zhou,Shuyu Tian,Xincong Tian,Zhongqiu Luo,Xiunan Cai,Yanjuan Zhang,Zuqiang Huang
The construction of highly active photocatalysts featuring the merits of high quantum efficiency and superior stability from solid wastes for the photocatalytic degradation of organics remains a great challenge. Herein, an acid leaching and in situ self-assembly strategy was proposed to engineer a series of FeC 2 O 4 /SiO 2 amorphous composites with a Si–O–Fe bridged interpenetrating structure, using copper smelting slag as the only source of Fe and Si. The loaded porous amorphous SiO 2 creates new charge transfer states within the FeC 2 O 4 crystal, and the formed Si–O–Fe bond acts as an electron conduction bridge, extensively promoting charge separation and utilization. The α-FeC 2 O 4 with wider layer spacing was generated under high temperature, which can provide smoother channels for charge transfer. Thus, α-FeC 2 O 4 with higher Si content (α-FOD/Si H ) showed excellent photocatalytic activity, achieving a chlortetracycline hydrochloride removal rate of 91.9 % within 120 min, which is 16.7, 3.8 and 2.0 times faster than copper smelting slag, α-FOD and β-FOD/Si H , respectively. The composite also exhibited remarkable structural stability, with the chlortetracycline hydrochloride removal rates remaining above 85.1 % after five consecutive cycles, ascribed to the interpenetrated SiO 2 structure and the formation of soluble [Fe 3+ -(C 2 O 4 2− ) 2 ] complexes, which greatly reduce iron ions release and prevent the formation of Fe(III) oxide/hydroxide passivation layers. This study provides a new idea for synthesizing highly active and stable FeC 2 O 4 catalysts through a “treat the wastes with wastes” strategy.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Huixian Zhou,Hui Zhong,Yiqing Zeng,Yutang Kang,Bin Chen,Shuanglu Ma,Yifan Li,Yu Zhang,Shasha Feng,Zhaoxiang Zhong,Weihong Xing
The strategy of constructing catalytic membrane has a significant influence on its structure and performance. In this work, Co 3 O 4 -C x @SiO 2 nanofiber membranes (NFMs) were fabricated by an in-situ growth–pyrolysis–oxidation strategy. The Co 3 O 4 -C x catalyst derived from ZIF-67 was wrapped around nanofibers, which helps to maintain a stable membrane structure, then suppressing the reduction of gas permeability. Among the Co 3 O 4 -C x catalyst, the carbon skeleton can prevent the agglomeration of Co 3 O 4 nanoparticles, obtaining an ultra-fine Co 3 O 4 nanoparticles with high dispersibility, redox property and surface area. The obtained Co 3 O 4 -C 300 @SiO 2 NFM exhibits outstanding ammonia selective catalytic reduction (NH 3 -SCR) denitrification activity (T 90 = 225 °C at a GHSV of 77,000 h −1 ). The effect of catalyst loading on PM 2.5 filtration performance of SiO 2 NFM was also tested. Co 3 O 4 -C 300 @SiO 2 NFM has higher filtration efficiency (99.99%) than SiO 2 NFM at a lower pressure drop of 58 Pa, which suggests that catalyst loading via our method can improve the filtration performance of SiO 2 NFM. This work might provide a universal strategy for the design and preparation of highly efficient catalytic membrane.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22895-22907
·
IF 3.925
Sheng Chen,Ji-Nan He,Ying-Min Xu,Sheng-Li Chen,Ai-Jun Wang
Photocatalytic conversion of nitrogen to ammonia with water under ambient conditions is a desired strategy. In the present work, in order to increase the activity of the TiO2 photocatalyst for N2 fixation, bilayer TiO2/SiO2 opal composite membranes were prepared via coupling TiO2 films with SiO2 opal photonic crystal (PC) films, and their photocatalytic performance in nitrogen fixation was tested. It was shown that when the photonic band gap (PBG) of the SiO2 PCs matched with the UV-Vis absorption edge of TiO2, the photon localization effect of SiO2 PCs was maximized to promote the photon capture of TiO2, resulting in more photogenerated electron–hole pairs for N2 activation. The photon localization effect of SiO2 PCs is negatively correlated with the thickness of the TiO2 films in composite membranes. The nitrogen fixation activity of the TiO2/SiO2 opal composite membrane, with the thickness of TiO2 film being 700 nm, was found to be 42.6 μmol gcat−1 h−1, which was 68% higher than that of the plain TiO2 film.
研究领域:
材料科学
·
化学工程
·
催化
·
光子学
✓ 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）