Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jiaqi Yan,Jingxuan Zhao,Jing Guo,Zhiyong Yang,Mingjun Xiong,Langsheng Pan,Yongfei Li
The self-aldol condensation of cyclopentanone (CP) to aviation fuel precursors was studied over various acid-base bifunctional TiO 2 -based catalysts. Combining TiO 2 and SnO 2 improved the catalytic performance and reduced the apparent activation energy, resulting in a selectivity of 97.5 % for 2-cyclopentylidene cyclopentanone (dimer C 10 ) and 2,5-dicyclopentylidene cyclopentanone (trimer C 15 ) (with 79.2 % yield for dimer C 10 ) at a CP conversion of 92.5 %. Response surface methodology (RSM) analysis of the reaction parameters showed that the actual results were in considerable concordance with the predicted ones. The excellent catalytic performance and stability exhibited by the TiO 2 -SnO 2 nanocomposites catalyst were attributed to (i) the nanoscale mixed metal oxide grains (bonded by Ti–O–Sn) and highly dispersed active Ti δ+ species, which facilitated the adsorption and activation of CP; (ii) the increase in surface O C species contributing to the abundance of hydroxyl groups (including M δ+ –O – pairs), which promoted the formation of the enolate intermediates; (iii) the construction of appropriate medium acid-base sites and the Brønsted/Lewis acid sites (BAS/LAS) ratio, which favored the formation of the desired dimer C 10 . Conversely, the TiO 2 -SiO 2 catalyst with plentiful strong acid-base sites induced the successive condensation of CP, which favored the formation of trimer C 15 . Furthermore, a plausible reaction mechanism for the catalytic self-aldol condensation of CP over the TiO 2 -SnO 2 catalyst was proposed. This study developed an efficient and stable TiO 2 -SnO 2 catalyst for CP self-aldol condensation with promising application potential.
研究领域:
化学工程
·
催化科学
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Haitao Wang,Yan Zheng,Wenyu Cui,Yanchun Sun,Dongxing Zhang
Core–shell shaped composites with tunable core compositions have been successfully synthesized by a two-step method. Initial, SnO 2 @C was prepared by fixing the hollow SnO 2 nanospheres into the void of amorphous carbon. Followed by another annealing treatment, SnO 2 was gradually reduced to metallic Sn in a mixed H 2 /N 2 atmosphere and leaded to Sn/SnO 2 or Sn cores. Subsequently, the original SnO 2 hollow nanospheres in the core was collapsed and transformed from clusters to nanoparticles. The electromagnetic absorption properties were significant improved for the binary composite (Sn/SnO 2 @C) as compared to SnO 2 hollow sphere, SnO 2 @C and Sn@C products. The effective absorption frequency width was up to 7.1 GHz with a matched thickness of 1.5 mm. The excellent electromagnetic absorption mechanism was attributed to the balanced impedance matching and attenuation ability. Besides, the existed Sn/SnO 2 interface plays a key role on the attenuation intensity since the boosted interface polarization intensity.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Siyuan Li,Ali Reza Kamali
The thermal oxidation of molten SnCl 2 leads to the formation of SnO 2 nanocrystals of less than 50 nm in diameter at 600 °C. These nanoparticles grow to large crystals with sizes of up to 10 µm by increasing the heat-treatment temperature to 800 °C. The excessive growth of SnO 2 crystals can be prevented by the introduction of polyethylene terephthalate (PET) and inorganic salts, through which SnO 2 @carbon nanocomposites could be prepared in a fast and clean way. Increasing the heat-treatment temperature from 600 to 800 °C leads to the enhancement of the crystalline quality of SnO 2 present in the nanocomposites, while the excessive crystal growth at high temperatures is prevented. A large number of highly-crystalline SnO 2 nanocrystals with sizes of less than 5 nm embedded in carbon substrate could be detected in the nanocomposite material prepared at 800 °C. The prepared sample exhibits an interesting combination of dye adsorption, with the capacity of 63 mg dye /g nanocomposite , as well as photocatalytic performance under normal sunlight irradiation toward the removal of methylene blue. This article suggests a clean and fast strategy for the preparation of highly crystalline SnO 2 - amorphous carbon nanocomposites.
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
SOLID STATE IONICS
·
2024
·
IF 3
Yuehong Yin,Yukun Liu,Youchao Wang,Yujie Cheng,Yongchao Li,Guohua Cao,Haitao Zong,Ming Li,Lingling Yan,Baoqing Zhang
The exploration of triethylamine (TEA) gas sensor with low cost, high response and low detection limit is still an urgent challenge. In this work, carbon dots (CDs) activated spherical Tin oxide (SnO 2 ) nanocomposites were synthesized by a simple and friendly one-pot hydrothermal strategy, and CDs with rich functional groups are in-situ introduced into SnO 2 . SnO 2 /CDs composites were characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy, etc. The gas sensing properties of SnO 2 /CDs and SnO 2 for triethylamine (TEA) were systematically investigated. The sensor based on SnO 2 /CDs exhibits a highly sensitive response, good selectivity, repeatability and long stability. It shows the response ( R a / R g = 55) to 100 ppm TEA is approximately 1.8 times that of SnO 2 sensor. More attractively, the detection limit of the SnO 2 /CDs composite to TEA is 90 ppb, which is 6.7 times that of SnO 2 . The significantly improved TEA sensing performance of SnO 2 /CDs sensing material is mainly attributed to the formation of heterojunction and the increased active sites due to the introduction of CDs.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hang Li,Qian Ma,Jia Guo,Qi Zhang,Xueying Wang,Yi Wang
Porous and hollow SnO 2 /Zn 2 SnO 4 composites with typical one-dimensional (1D) structure have been synthesized by adjusting the amounts of 2-methylimidazole zinc salt (ZIF-8) added in the precursor solution through a modified electrospinning technology. Compared with the gas-sensing performance of different samples detected in the normal condition, it is confirmed that the optimal working temperature can be markedly decreased from 260 to 120 °C under UV light irradiation, along with the substantially improved gas selectivity. In addition, SnO 2 /Zn 2 SnO 4 heterostructures exhibit a higher response (increases from 1.7 to 2.8) and faster response/recovery times (decreases from 24/154 to 14/42 s) to triethylamine (TEA) than that of the pure SnO 2 . Significantly, the good practicality of gas sensors for food spoilage evaluation could be testified by effectively detecting the gas released during the putridity of prawns. UV light enhanced surface electron migration mainly contributes to the elevated synergistic effect between the formation of n-n heterojunction and tunable surface/interface electron transport behavior, as well as the adsorption and desorption of TEA molecules on the surface of the sensing materials.
研究领域:
材料科学
·
传感技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 51
·29796-29804
·
IF 3.049
Yanguang Mu,Cong Huang,Haipu Li,Leilei Chen,Ding Zhang,Zhaoguang Yang
Sb-doped SnO2 electrodes were prepared with the practical sol–gel method and were used for the electrocatalytic degradation of ciprofloxacin (CIP) in aqueous solution. Results from the electrochemical characterization (including cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy) showed that the electrode with 16 coating times (SSO-16) had the highest oxygen evolution potential of 2.2 V (vs. SCE) and the highest electrochemically active area of 3.74 cm2. The results of scanning electron microscopy and X-ray diffraction showed that the coating times could affect the surface morphology and crystal structure of the electrodes, and the SSO-16 electrode had a denser surface, higher crystallinity, and smaller grain size (28.6 nm). Moreover, the experimental parameters for CIP degradation with SSO-16 were optimized, and the removal ratio of CIP reached to almost 100% within 60 min. In addition, the possible degradation pathways of CIP were proposed. And the stability and reusability of the SSO-16 electrode were also studied. These results are valuable for the preparation of high electrocatalytic performance electrodes by a sol–gel coating method for electrochemical degradation of antibiotics.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xiangxin Meng,Jianguo Deng,Qing Sun,Beibei Zong,Zizhao Zhang,Bo Shen,Bonan Kang,S. Ravi P. Silva,Lijun Wang
Perovskite solar cells (PSCs) have become a promising photovoltaic (PV) technology. Meanwhile, developing an electron transport layer (ETL) has been an effective way to promote the power conversion efficiency (PCE) of PSCs. Here, a 4-morpholine ethane sulfonic acid sodium salt (MES Na + ) doped SnO 2 ETL is utilized in planar heterojunction PSCs. The results show that the MES Na + doped ETL can improve the crystallinity , and absorbance of perovskite films, and passivate interface defects between the perovskite film and SnO 2 ETL. The doping effect accounts for the enhancement of conductivity and the decreasing work function of SnO 2 . When 10 mg mL −1 MES Na + was added to the SnO 2 precursor solution, the device showed the best performance Jsc, Voc, and FF of the PSCs values, which were 23.88 mA cm −2 , 1.12 V and 78.69%, respectively, and the PCE was increased from 17.43% to 21.05%. This doping ETL strategy provides an avenue for defect passivation to further increase the efficiency of perovskite solar cells.
研究领域:
材料科学
·
光伏技术
·
能源研究
✓ 已验证
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 18
·5019-5029
·
IF 9.405
Quanquan Zhang,Yanchun Ge,Changjun Yang,Bingguang Zhang,Kejian Deng
The selective conversion of glucose into value-added chemicals in the presence of only water is a challenging topic. In this work, selective photocatalytic oxidation of glucose in water was studied using iron thioporphyrazine modified SnO2 (SnO2/FePz(SBu)8) as the catalyst and atmospheric air as the oxidant under simulated sunlight irradiation. It was found that value-added organic acids including glucaric acid, gluconic acid and formic acid could be obtained from the oxidation of glucose under such conditions. The effects of the FePz(SBu)8 content, glucose concentration and additional addition on the conversion of glucose and the selectivity of the organic acids were further explored. Under the optimized conditions, the total selectivity for the organic acids on the SnO2/FePz(SBu)8 photocatalyst reached up to 52.2% at 34.2% glucose conversion. More importantly, it has been demonstrated that the presence of FePz(SBu)8 on the surface of SnO2 can keep the selectivity of the organic acids unchanged under conditions of increasing the glucose conversion. To illustrate the synergistic effect for the enhanced photocatalytic activity between FePz(SBu)8 and SnO2, surface photocurrent, electron spin resonance (ESR) spectra and adsorption behavior experiments were carried out on pure SnO2 and SnO2/FePz(SBu)8. It was found that the introduction of FePz(SBu)8 could enhance the separation of photogenerated charge, promote the generation of active species for photocatalysis and improve the adsorption capacity of glucose, which are beneficial to the enhancement of photocatalytic activity. Additionally, a possible pathway of glucose oxidation was proposed through both detailed analysis of the oxidation intermediate of glucose and comparative experiments with different organic acids as the substrates, indicating that the formation of organic acids were fulfilled by two parallel and subsequent reactions at the beginning of the reaction.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 11
·8703-8707
·
IF 3.086
Qi Li,Yi He,Rufang Peng
SnO2 nanoparticle-loaded graphitic carbon nitride (SnO2NPs/g-C3N4) hybrids were successfully synthesized by one-pot calcination. Various characterization means and detection techniques were used to analyse their structure and properties. It was found that SnO2 NPs possess the synergistic effect on g-C3N4. The addition of SnO2 NPs not only increases the surface of g-C3N4 but provides extra electrons. Having added 10 wt% SnO2NPs/g-C3N4 hybrids, the onset decomposition temperature of ammonium perchlorate (AP) was decreased to 352.2 °C. Furthermore, considering the band gap of g-C3N4 (Eg = 2.7 eV) and SnO2 (Eg = 3.6 eV), the conduction band electrons (ecb− and valence band holes (h+)) were generated on their surface upon heat excitation. In addition, on the basis of the synergistic effect (the ecb− would transfer from g-C3N4 to SnO2) of SnO2, a possible synergistic mechanism was proposed to understand the thermal decomposition of AP.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Wei Guo,Lijun Liang,Yaxu Zhao,Congyi Zhao,Xiong Lu,Yunpeng Cao,Faming Gao
In this study, the SnO 2 /Nb 2 CT x MXene nanocomposite containing 0D/2D interfaces was prepared by situ growth strategy of one-step hydrothermal method . A SnO 2 /Nb 2 CT x MXene based acetylcholinesterase (AChE) biosensor was constructed for pesticide detection. Highly conductive Nb 2 CT x MXene, acting as substrate material, restrained the agglomeration of nanoparticles (NPs) and accelerated electron migration due to the confinement effect and well-known accordion-like layered structure. In addition, SnO 2 anchored on both sides of the Nb 2 CT x MXene nanosheets effectively provided a large surface area, abundant surface groups and active sites, which preserved numbers of electrons at the interface of the heterojunction . The SnO 2 /Nb 2 CT x MXene hybrids with outstanding conductivity, good biocompatibility and structural stability were beneficial for AChE immobilization. Under the optimized conditions, as-fabricated electrochemical biosensor demonstrated superior performance with linear detection range of 5.1 × 10 −14 - 5.1 × 10 −7 M for chlorpyrifos , along with the limit of detection (LOD) down to 5.1 × 10 −14 M (calculated for 10% inhibition). Furthermore, it is highly expected that this biosensor can be applied for the detection of other organophosphorus pesticides in the environment, providing an effective nanoplatform in biosensing field.
研究领域:
生物传感器
·
电化学检测
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2022
·Vol. 16
·期 11
·2200276
·
IF 10.947
Hongbin Xiao,Jintao Fu,Xingzhan Wei,Baiqian Wang,Qingkai Qian,Jianfeng Huang,Ru Li,Zhigang Zang
The severe recombination of carriers and poor stability against moisture environment have limited the application of CsPbX 3 (X = Cl, Br, I) nanocrystals in photodetection. Herein, a large-scale synthesis of SnO 2 -coated CsPbBr 3 NCs (abbreviated to CsPbBr 3 @SnO 2 NCs) has been reported for the first time by combining the water-triggered transformation of Cs 4 PbBr 6 NCs and the hydrolysis of tin 2-ethylhexanoate. Owing to the construction of the CsPbBr 3 /SnO 2 heterojunction, the recombination rate of carriers in the CsPbBr 3 @SnO 2 NCs is greatly reduced compared to that of the pristine CsPbBr 3 NCs. The stability against water degradation is also improved due to the protection of the SnO 2 coating. Accordingly, a CsPbBr 3 @SnO 2 -graphene hybrid device for high-performance photodetection is demonstrated. Results show that the responsivity of the device reaches 6.2 × $\ \ensuremath{\times{}}$ 10 4 A W −1 at 1 V, which is over 496-fold of the pristine CsPbBr 3 device. This work not only provides a robust approach for the surface modification of CsPbX 3 NCs but also offers useful guidance on the optoelectronic applications with CsPbX 3 NCs.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
·
2023
·
IF 3.3
Lanpeng Guo,Hongping Liang,Dongmin An,Huimin Yang
Noble metal doping is considered to be an efficient way to promote the gas sensing performances of metal oxide semiconductor nanomaterials . In this study, uniform silver (Ag)-doped tin dioxide (SnO 2 ) nanoparticles were successfully synthesized through a facile one-step hydrothermal route. The diameter of Ag/SnO 2 nanoparticles is less than 10 nm. Compared with pure SnO 2 -based sensor, the Ag/SnO 2 -based sensors are found to effectively improve their sensitivity and selectivity to ethanol. In particular, the 6% Ag/SnO 2 -based sensor displays a high response (Ra/Rg = 135) to 50 ppm ethanol at 180 °C. The enhancement of ethanol sensing properties of the 6% Ag/SnO 2 sample due to the small size of SnO 2 and catalytic sensitization effect of Ag, as well as the Schottky barrier forms between SnO 2 and Ag. These results suggest that the Ag-doped SnO 2 nanoparticles acting as a promising functional composite material have potential application for ethanol sensors.
研究领域:
材料科学
·
化学
·
传感器技术
✓ 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）