Biochar
·
2025
·Vol. 7
·期 1
·1-19
·
IF 13.5
Zhang Chuchen,Zhao Shuwen,Huang Qilan,Liu Jianqiao,Zhang Qianru
Tetracycline poses a major threat to the aquatic environment and human health, and there is an urgent need for a green, efficient and recyclable technological means to remove its negative effects. To address this need, three Fe 3 O 4 @SnO 2 modified wheat straw biochar nanocomposites with different Fe/Sn content ratios (Fe/Sn = 0.5, Fe/Sn = 1, and Fe/Sn = 2) were prepared by pyrolysis. The adsorption and degradation properties and related mechanisms of Fe 3 O 4 @SnO 2 modified wheat straw biochar nanocomposites were investigated by adsorption, degradation and free radical quenching experiments, as well as EPR analysis. The removal of tetracycline by Fe 3 O 4 @SnO 2 modified wheat straw biochar nanocomposites (Fe/Sn = 0.5) at pH 7.0 within 3 h was up to 91.80%, which is in accordance with the quasi-primary kinetic model. Under the interference of inorganic anions and cations, the removal of tetracycline by the composites was not affected by the coexisting ions except Ca 2+ , Mg 2+ , HCO 3 − and CO 3 2− . The composites were able to efficiently remove tetracycline from pharmaceutical wastewater with a removal rate of 82.33%. It was found that the composites could be reused at least five times. FTIR, XPS combined with DFT calculations elucidated the mechanism of tetracycline removal by the composites, with •OH and •O 2 − being the main substances involved in the photodegradation of tetracycline, the incorporation of manganese dioxide quantum dots enhancing the response to visible light, and the incorporation of magnetic nanoparticles resulting in rapid charge transfer and improved spatial separation of photogenerated carriers. The modification measures significantly increased the specific surface area of the biochar and enhanced the adsorption and photocatalytic properties. Based on these studies, the developed nanocomposites provide a new idea for the removal of antibiotics from pharmaceutical wastewater. Graphical
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
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiaoli Xu,Hongtao Jiang,Wangwang Liu,Shengyi Wang,Xiaoping Wang,Mengyu Wang,Wei Ma,Guorong Sun,Jiming Liu
Two-dimensional transition metal carbides/nitrides (MXenes) show great potential in volatile organic compound (VOC) sensors owing to their exceptional electrical properties, numerous active sites, and abundant terminal functional groups. However, pure MXene Ti3C2Tx is prone to oxidative degradation under ambient environment, and the insufficient response and poor stability are still grand challenges. Hereby, by deliberately introducing metal oxide semiconductor in multilayer Ti3C2Tx, a promising Ti3C2Tx/SnO2 sensor with excellent long-term stability and outstanding selectivity is developed for VOC monitoring. The research shows that the Ti3C2Tx/SnO2 hybrid sensor implements efficient detection of hydrogen-bonded gases and is especially highly efficient with ethanolamine (EA). The sensitivity of the hybrid sensor to EA is improved by over 10-fold in comparison with pristine Ti3C2Tx, besides the good selectivity to over 12 different VOCs. The synergistic effects of n-n nanoheterojunctions, the large specific surface area of 45.186 m2/g and mesoporous-rich hierarchical structure, and the functional terminal groups together facilitate the EA-sensitive properties. In addition, the innovative preparation of the Ti3C2Tx/SnO2 sensor, which takes advantage of terpinol, contributes to the close contact of Ti3C2Tx/SnO2 on the ceramic tubes, thus improving the sensor sensitivity. The scientific findings of this work may provide valuable ideas for the exploration of innovatively composite gas sensors.
研究领域:
材料科学
·
化学传感器
·
纳米技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2024
·
IF 2.4
Chen Pengfei,Li Jin
SnO 2 quantum dots, ranging from 10 to 30%, were combined with ZnO nanosheets to create a heterojunction photocatalyst. This composite was generated using a basic hydrothermal method, which was then followed by high-temperature calcination to enhance the photocatalytic activity of ZnO. The results showed that the synthesized SnO 2 nanoparticles with tetragonal rutile phase and ZnO nanosheets with hexagonal fibrillar zincite phase, the coupling of SnO 2 quantum dots and ZnO nanosheets improved the separation efficiency of the photogenerated carriers, and at the same time broadened the photoresponse range. Through the degradation of the organic dye Rhodamine B (RhB), the best photocatalytic activity was found at 20% amount of SnO 2 in the composite sample (SZ-2), and the degradation efficiency of RhB reached 96.5% at the light irradiation time of 100 min. In addition, an in-depth study of the photocatalytic mechanism of the constructed heterojunction by active group trapping experiments, and the results showed that •O 2 − and h + were the main active substances in this degradation system. Meanwhile, the SZ-2 photocatalyst was tested for five cycles, and the degradation efficiency of the 5th cycle was 72%. The cycle test indicates that the SZ-2 sample is highly stable and reusable. Therefore, the results showed that the prepared SnO 2 /ZnO heterojunction photocatalysts are suitable materials for degrading organic dyes.
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 NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 4
·4115-4119
·
IF 1.338
Qiao Xiuqing,Hu Fuchao,Hou Dongfang,Li Dongsheng
SnO2/Ag hollow microsphere, assembled form SnO2 and Ag nanoparticles, was synthesized via a facile one-step hydrothermal synthesis method using Na2SnO3.3H2O, CO(NH2)2 and AgNO3 as raw materials.
XRD, SEM, and TEM results revealed that the obtained SnO2/Ag hollow microsphere with diameters of ca.3∼5 μm was built from uniformly distributed rutile SnO2 and cubic Ag nanoparticles. Moreover, XPS results indicate the existence of strong interaction between
Ag and SnO2 nanoparticles, rather than simply physical contact, endowing the SnO2/Ag hollow microspheres with excellent photocatalytic performance in the degradation of RhB solution under visible light irradiation.
研究领域:
材料科学
·
纳米技术
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Ruling Wang,Zhiwei Cai,Yaxing Zhang,Runan Tan,Lei Wang,Hanping He,Yunbin He,Gang Chang
The pH value is a crucial indicator of the acidity or alkalinity of beverages, directly influencing taste, flavor, shelf life, and consumer health, making pH detection essential in the field of food safety. To enable precise pH monitoring, a SnO₂-based electrolyte-gated thin-film transistor (EGTFT) pH sensor was developed via a low-cost sol-gel process. Experimental results demonstrated that the device operated at a low voltage (0.5 V) and exhibited high sensitivity (78.99 mV·pH −1 ) beyond the Nernst limit. The superior stability and corrosion resistance of the SnO 2 sensitive layer enabled the sensor to maintain current within 97 % of its original value during 14 days of long-term stability test. The actual measurements of pH levels in beverages have demonstrated high accuracy, indicating that the SnO 2 -EGTFT pH sensor can serve as an excellent platform for highly sensitive and stable pH detection in the food industry.
研究领域:
食品科学
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材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Tianqi Niu,Fuchao Zhen,Yue-Min Xie,Tinghuan Yang,Qin Yao,Jing Lu,Kui Zhao,Hin-Lap Yip
Metal oxides are commonly employed as electron transport layers (ETLs) for n-i-p perovskite solar cells (PSCs), but the presence of surface traps and their mismatched energy alignment with perovskites limits the corresponding device performance. Therefore, the interfacial modification of ETLs by functional molecules becomes an important strategy for tailoring the interfacial properties and facilitating an efficient charge extraction and transport in PSCs. However, an in-depth understanding of the influences of their molecular structures on the surface chemistry and electronic properties of ETLs is rarely discussed. Herein, three carboxylic acid-based molecules with different chemical structures were employed to modify the SnO2 ETL and their effects on the performance of PSCs were systematically investigated. We found that the alkyl-chain length and carboxyl number in molecular structures can dramatically alter their binding strength to SnO2, providing a good strategy to fine-tune their film quality, electron mobility, and energy offset at the cathode interface. Benefiting from the optimal coordination ability of citric acid (CA) to SnO2, the corresponding PSCs show better charge transport properties and suppressed nonradiative recombination, leading to a champion efficiency of 23.1% with much improved environmental stability, highlighting the potential of rational design of molecular modifiers for high-performance ETLs applied in PSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Ke Xu,Ziwang Kan,Feiyu Zhang,Yuan Qu,Siqi Li,Song Liu
Ethanol gas sensing has been attracting more and more attention due to its significance, such as human health care, and detection in drunk driving. However, the low sensitivity, the high limit of detection and the long response time restrain its further application development. Here we report SnO 2 nanomaterials with well-controlled hollow multi-shelled structure as an efficient ethanol gas sensing. The shell number was tuned by the concentration of the precursor. Among, the double-shell SnO 2 nanomaterials (SnO 2 -D) exhibited the best selectivity towards ethanol, reaching 22.5 of R g /R a ratio. Moreover, the 1 ppm ethanol was even detected, the R g /R a ratio being 1.37. The response time to 100 ppm ethanol was only 2 s. Furthermore, the SnO 2 -D maintained the same performance after 21 days of continuous response to 100 ppm ethanol. Based on experiments and in situ FTIR, the outstanding sensing performance is attributed to the excellent spatial confinement and large active surface of the double-shell that combine the enhanced gas adsorption, and increase conductive electrons.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Wenwen Ge,Yuhong Chang,Vinothkumar Natarajan,Zhenyu Feng,Jinhua Zhan,Xicheng Ma
Novel In 2 O 3 -SnO 2 hybrid sensing nanostructures with porous nature were successfully prepared and characterized by various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscopy (HRTEM). Gas sensing properties of the fabricated sensor based on the as-prepared In 2 O 3 -SnO 2 hybrid nanostructures were systematically investigated and compared with those of pure SnO 2 . The hybrid nanostructures containing 3% In 2 O 3 exhibit the highest response value of 30.7–100 ppm formaldehyde at 100 °C, which was 14 times higher than that of pure SnO 2 . Moreover, gas sensors based on the as-prepared In 2 O 3 -SnO 2 hybrid nanostructures also exhibit high stability and good selectivity for formaldehyde. The enhanced sensing performances of formaldehyde were mainly attributed to the formation of n-n heterojunctions and the synergistic interaction between In 2 O 3 and SnO 2 .
研究领域:
材料科学
·
纳米技术
·
传感器学
·
表面化学
·
功能材料
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Xiaoyan Song,Fangzheng Zhao,Zhipeng Wang,Runbin Ge,Jinfeng Xing
In this study, ZnO@SnO2–Pt core–shell nanofibers with a hollow structure have been prepared by coaxial electrospinning and heat treatment. The core–shell and hollow structures of nanofibers were confirmed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The Brunauer–Emmett–Teller (BET) specific surface area test shows that the specific surface area of ZnO@SnO2–Pt core–shell nanofibers is larger than those of ZnO@SnO2 core–shell nanofibers and SnO2 nanofibers. The gas-sensing test result shows that the response to 100 ppm ethanol gas is 132.04 and the response time is 5 s at 200 °C for ZnO@SnO2–Pt core–shell nanofibers with 0.3 wt % Pt. Compared with those of ZnO@SnO2 core–shell nanofibers without Pt and pure SnO2 nanofibers, the optimum working temperature of ZnO@SnO2–Pt core–shell nanofibers is reduced by 125 °C and the maximum response is increased by 70.9 and 367.7%. Furthermore, the gas-sensing mechanism is discussed in detail.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Liyong Du,Xin Guan,Liping Hao,Yi Liu,Heming Sun
Researchers are showing significant interest in the development of nanostructures with hierarchical porosity. This study introduces an eco-friendly, cost-effective, and straightforward method to create SnO 2 hollow porous nanostructures using the peony as a biotemplate. A comprehensive analysis of the gas sensing characteristics of these hierarchical SnO 2 hollow porous nanostructures is conducted. The results show that the gas sensor based on SnO 2 showcases relatively high response values measuring 18.3 and exhibits rapid response speed of 1 s to 100 ppm isopropanol, even at a comparably low operating temperature of 180 °C. Additionally, the sensor displays good repeatability and long-term stability, which can be attributed to the inherent advantages stemming from its distinct structure. Therefore, this study provides experimental and theoretical foundations for the potential application of hollow porous SnO 2 structures in sensor technology.
研究领域:
材料科学
·
纳米技术
·
传感器技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Yadong Du,Xiangtong Meng,Jun Qi,Benxiang Gong,Yangjun Ma,Jiachun Li,Hongqi Zou,Jieshan Qiu
Electrochemical CO 2 reduction (ECR) to value-added products provides a pathway to reduce CO 2 emission and to enable a closed carbon cycle. Compared to powdered catalysts, self-supporting electrocatalysts have more prominent advantages such as high charge transfer capacity and the ability to serve directly as working electrodes without the need for binders. Herein, a self-supporting catalyst featuring SnO 2 nanoparticles incorporated into porous carbon nanofiber (SnO 2 -PCNF) was crafted via electrospinning followed by annealing in CO 2 . SnO 2 -PCNF can directly function as working electrode for ECR to produce HCOOH, achieving a high Faradaic efficiency of 92.3%. Also, the SnO 2 -PCNF can stably catalyze ECR process for more than 50 h. Theoretical calculations and in-situ Raman spectroscopy elucidate the underlying ECR mechanism over SnO 2 -PCNF, wherein the catalyst significantly reduces the energy barrier of the rate-determining step. This effectively suppresses the competitive hydrogen generation. This work provides some insights into design of binder-free and high-performance ECR electrocatalysts.
研究领域:
材料科学
·
环境科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2014
·Vol. 44
·期 7
·3034-3042
·
IF 4.097
Xiang Chen,Feng Zhang,Qian Wang,Xiao Han,Xin Li,Jiuyu Liu,Huiming Lin,Fengyu Qu
ZnO/SnO2 hetero-nanofibers about 250 nm in diameter and several micrometers in length are synthesized via an electrospun method using zinc chloride and stannous chloride as inorganic sources. All fibers are composed of many nanoparticles (5–10 nm) that induce a highly porous structure as well as high surface area. By adjusting the ratio of zinc/stannous source, the synthesized porous ZnO/SnO2 materials show various structures (corrugated fiber and tube), that are a result of the different oxidation/decomposition temperatures of the two components. Their photodegradation abilities toward various dye wastewaters (methylene blue, congo red, eosin red, and methyl orange) are demonstrated, showing fast photodegradation and good recycling ability. It is noteworthy that ZnO/SnO2 exhibits an enhanced photodegradation ability to congo red, ascribed to the high adsorption capacity derived from the strong electrostatic interaction between ZnO/SnO2 and congo red. Based on the investigation, these porous ZnO/SnO2 hetero-nanofibers possess versatile potential applications for wastewater purification.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）