CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Hui Mei,Shixiang Zhou,Mingyang Lu,Yong Zhao,Laifei Cheng
For real-time environmental monitoring and gas detection under harsh conditions, gas sensors with high reliability, sensitivity, and selectivity are in increasing demand. Therefore, pine-branch-like α-Fe 2 O 3 /TiO 2 with a core–shell hierarchical heterojunction structure was designed and fabricated for ethanol sensing. The heterojunction increased the O adsorption, resulting in the formation of more chemisorbed O species for reaction with the target gas. Moreover, the pine-branch-like morphology formed three-dimensional hollow holes as channels for molecule diffusion and adsorption. Compared with gas-proof structures, the hollow regions can realize gas diffusion in the inner and outer surfaces of materials simultaneously. Further, in contrast to aggregated structures, the fibers were separated from each other, and charge conduction between the fibers needed to pass through the surface sensing layer at the fiber boundary; thus, the overall resistance change of the sensors was significantly affected by the response of the heterojunction to the target gas. Consequently, the α-Fe 2 O 3 /TiO 2 sensor exhibited a high response value of 40.4 toward 500 ppm ethanol gas and had excellent selectivity to ethanol. The proposed strategy may facilitate the design and construction of effective heterojunctions and nanostructures for gas sensing.
研究领域:
材料科学
·
传感器技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 13
·9176-9185
·
IF 4.449
Xin Li,Huiming Lin,Xiang Chen,Hao Niu,Jiuyu Liu,Ting Zhang,Fengyu Qu
The design and synthesis of unique novel heterostructures for high-performance photocatalytic activity has exerted a tremendous fascination and has recently attracted intensive attention. In this work, a branch-like α-Fe2O3/TiO2 heterostructure has been synthesized controllably through an electrospinning method combined with a hydrothermal approach. The backbone of the heterostructure is composed of a 3D porous TiO2 nanofiber (∼70 nm in diameter) network with plenty of α-Fe2O3 nanorods (100–200 nm in length) deposited on them. The novel branch-like nanocomposites have an abundantly porous structure as well as large surface areas (up to 42.8 m2 g−1). In addition, their visible light photodegradation behaviour towards organic dyes, including Congo red (CR), methylene blue (MB), eosin red (ER) and methyl orange (MO), was investigated. Their excellent photocatalytic performances are attributed to their large surfaces, improved visible light absorption and high separation efficiency of the photogenerated electrons/holes. Furthermore, the degradation process was further studied by varying the amount of α-Fe2O3 deposited. The sample α-Fe2O3/TiO2-3 possessed the best performance to efficiently decolor CR solution even at a high concentration of 50 mg L−1 (160 min, 94 mg g−1), ascribed to the high adsorption capacity derived from the large surface, strong electrostatic interaction and structural match between α-Fe2O3/TiO2-3 and CR. These α-Fe2O3/TiO2 heterostructures exhibit great potential for decontamination of organic pollutants in waste water under visible light.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2024
·Vol. 24
·期 8
·2604
·
IF 3.4
Zhihua Zhao,Zhenli Lv,Zhuo Chen,Baocang Zhou,Zhigang Shao
Metal oxide semi-conductors are widely applied in various fields due to their low cost, easy processing, and good compatibility with microelectronic technology. In this study, ternary α-Fe2O3/TiO2/Ti3C2Txnanocomposites were prepared via simple hydrothermal and annealing treatments. The composition, morphology, and crystal structure of the samples were studied using XPS, SEM, EDS, XRD, and multiple other testing methods. The gas-sensing measurement results suggest that the response value (34.66) of the F/M-3 sensor is 3.5 times higher than the pure α-Fe2O3sensor (9.78) around 100 ppm acetone at 220°C, with a rapid response and recovery time (10/7 s). Furthermore, the sensors have an ultra-low detection limit (0.1 ppm acetone), excellent selectivity, and long-term stability. The improved sensitivity of the composites is mainly attributed to their excellent metal conductivity, the unique two-dimensional layered structure of Ti3C2Tx, and the heterojunction formed between the nanocomposite materials. This research paves a new route for the preparation of MXene derivatives and metal oxide nanocomposites.
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
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 23
·22455-22463
·
IF 2.8
Wang Pingping,Dong Faqin,Liu Mingxue,He Huichao,Huo Tingting,Zhou Lei,Zhang Wei
Photoelectrochemical process is an environmentally friendly technology and has a wide application in the control of environmental pollutants. Efficient nanophotocatalysts responsive to visible light are still highly attractive. In this work, α-Fe 2 O 3 /TiO 2 were grown on fluorine doped tin oxide (FTO) substrates by hydrothermal method for photoelectrochemical reduction of Cr(VI). Compared with the separate α-Fe 2 O 3 and TiO 2 electrodes, the composite α-Fe 2 O 3 /TiO 2 electrodes show higher photocurrent density. Under visible light irradiation, 100% removal efficiency of Cr(VI) was obtained after 40 min treatment. The composite α-Fe 2 O 3 /TiO 2 electrodes showed an enhanced absorbance in visible light region and had good stability to photoelectrochemical reduction of Cr(VI). The role of hole scavengers (citric acid and oxalic acid) and pH values was systematically investigated. This novel intensification approach provides new insight on the application of photoelectrochemical reduction in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Caixia Deng,Shuang Li,JiaYu Wang,Qiang Yang,Hui Chen,Fenglin Tang,Xiupei Yang
In this work, flower-like TiO 2 (TiO 2 -F) was first prepared by modulating the morphology of TiO 2 , and then, α-Fe 2 O 3 was loaded onto TiO 2 -F to successfully prepare α-Fe 2 O 3 /TiO 2 -F heterojunction materials. The material showed excellent degradation properties of doxycycline hydrochloride under visible light. The photocatalytic degradation efficiency of α-Fe 2 O 3 /TiO 2 -F2 for doxycycline hydrochloride under visible light reached 95.76 % in 120 min, and its pseudo-first-order degradation rate constant was 0.02647 min −1 , which was 3.68 and 2.01 times higher than those of α-Fe 2 O 3 and TiO 2 alone, respectively. This good photocatalytic performance is attributed mainly to the introduction of α-Fe 2 O 3 to form a Type II heterojunction with floral TiO 2 (TiO 2 -F), which is capable of promoting the separation of electron–hole pairs of photocatalysts and exhibiting a stronger redox capacity. The material exhibits notable stability and maintains high degradation efficiency even after undergoing multiple cycles. Furthermore, free radical trapping experiments and electron spin resonance (ESR) characterization revealed that hydroxyl radicals play a dominant role in this system. Finally, the degradation pathways were analyzed, and relevant toxicological analyses were performed, indicating that the toxicity of doxycycline hydrochloride gradually decreased during the photocatalytic degradation process.
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 Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Jun Liu,Shuanglei Yang,Wei Wu,Qingyong Tian,Shuyuan Cui,Zhigao Dai,Feng Ren,Xiangheng Xiao,Changzhong Jiang
The 3D flowerlike α-Fe2O3@TiO2 core–shell nanocrystals with thorhombic, cubic, and discal morphologies are synthesized for photocatalytic application. α-Fe2O3 nanocrystals were prepared via a Cu2+, Zn2+, and Al3+ ion-mediated hydrothermal route. The α-Fe2O3@TiO2 core–shell nanocrystals are obtained via a hydrothermal and annealing process. The shape-dependent photocatalytic activities of these as-obtained α-Fe2O3@TiO2 core–shell nanocrystals are measured. The results reveal that the discal α-Fe2O3@TiO2 nanocrystals exhibit the best photocatalytic activity relative to the other two core–shell nanocrystals because the discal α-Fe2O3 nanocrystals possess more rough surface and surface defects. The fast interfacial charge-transfer process and the wide spectral response could be the driving force for the enhanced photocatalytic performance. These core–shell architectures provide a positive example for synthesis of novel composite nanomaterial.
研究领域:
材料科学
·
纳米技术
·
光催化
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2026
·
IF 4
Yunxiao Ban,Yufei Zhao,Yuzhen Wu,Haoran Chen,Yaping Jiang
Photocatalytic treatment of wastewater is often limited by insufficient light penetration caused by pollutants and inefficient catalyst recovery. To address these challenges, a novel dual-channel photocatalytic reactor (DCPR) based on an α-Fe₂O₃/TiO₂ film was developed. In this system, light propagates through an independent transparent channel, while pollutants and oxygen flow through a separated reaction channel, enabling enhanced light utilization and improved interaction between reactants and photocatalytic interfaces. The results demonstrate that the dual-channel configuration significantly enhances photocatalytic performance. The degradation rate of methylene blue was 3.65 times higher than that of a conventional single-channel reactor. Under optimized conditions, the phenol degradation efficiency reached 93.05% after 12 h of visible-light irradiation, accompanied by a total organic carbon (TOC) removal efficiency of 71.3%. The α-Fe₂O₃/TiO₂ catalyst film exhibited excellent reusability, maintaining approximately 90% of its degradation efficiency after ten consecutive cycles. Furthermore, the practical applicability of the DCPR system was evaluated using a synthetic industrial wastewater matrix containing phenol, humic acid, and inorganic salts. The reactor maintained continuous degradation capability under this complex wastewater condition, demonstrating its potential for practical wastewater treatment applications. Mechanistic investigations revealed that superoxide radicals (·O₂⁻) and photogenerated holes (h⁺) were the dominant reactive species involved in the degradation process, while hydroxyl radicals (·OH) played a secondary role. The enhanced photocatalytic performance was attributed to the separation of light and pollutant transport pathways, which effectively reduced light attenuation and promoted mass transfer. This study provides an effective reactor design strategy for improving photocatalytic efficiency and offers a promising approach for the treatment of complex wastewater matrices.
✓ 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）