APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Zhihui Hu,Huanmin Liu,Ningxin Kang,Kangle Lv,Qin Li
Using solvothermal methods to in situ oxidize two-dimensional titanium carbide (Ti 3 C 2 T x ) MXene into TiO 2 nanocrystals offered an effective strategy to construct highly efficient TiO 2 /Ti 3 C 2 T x heterojunctions for photocatalytic applications. Nevertheless, the effect of the chosen solvent on the Ti 3 C 2 T x oxidation and the product's performance was often neglected. Herein, isopropanol (ISO), ethanol (EtOH), ethylene glycol (EG), dimethyl sulphoxide (DMSO) and deionized water (Water) were taken as the representative solvents to prepare TiO 2 /Ti 3 C 2 T x composites by one-step solvothermal method for photocatalytic NO emission. It was the large polarity, dielectric constant and surface tension of the solvents that offered Ti 3 C 2 T x with good dispersibility and high oxidation degree during the solvothermal process. More importantly, the solvothermal treatment of Ti 3 C 2 T x in DMSO could promote the formation of TiO 2 nanoparticles with obviously higher crystallinity and more surface oxygen vacancies than those in EG, EtOH and ISO. Therefore, the photocatalytic NO oxidation efficiency of the samples within 30-min irradiation showed a descending order of TT-DMSO (46.9%), TT-Water (42.2%), TT-EG (32.3%), TT-EtOH (26.7%), and TT-ISO (19.9%). This work highlighted the significance of oxidation environment for Ti 3 C 2 T x , which could bring about some new but necessary consideration on the processing technique of MXene families for their future practical applications.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongxia Liu,Minggang Zhang,Zhipeng Jin,Hui Mei,Gangqiang Zhu,Longkai Pan,Laifei Cheng,Litong Zhang
Photocatalysis is recognized as one of the most promising techniques for environment purification. However, the inconvenient recovery of powder photocatalysts significantly impeded their practical applications. Immobilization of the photocatalysts on supports to form monolithic photocatalysts is an effective method to solve this problem. Herein, a monolithic photocatalyst Bi 12 TiO 20 /Bi 4 Ti 3 O 12 /SiOC is fabricated by growing optimal Bi 12 TiO 20 /Bi 4 Ti 3 O 12 S-scheme heterojunction onto 3D-printed porous SiOC support. On one side, S-scheme heterojunction facilitates the separation of photoinduced electrons and holes while retaining their strong redox ability. On the other side, the porous structure favors mass transport and improves light harvesting by reflecting the light several times. Under simulated solar light irradiation, the NO removal efficiency of the monolithic photocatalyst Bi 12 TiO 20 /Bi 4 Ti 3 O 12 /SiOC is 16.4 %. Furthermore, the composite has good stability and reusability, suggesting its great potential in practical application. The possible photocatalytic mechanism is proposed according to systematic experiments and density functional theory (DFT). This work provides a rational reference for constructing efficient photocatalysts for environmental purification.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1455
·
IF 4.501
Ting Gao,Ke Zhang,Qiuhui Zhu,Qingyun Tian,Hui Wang,Wei Zhang,Jiangyushan Liang,Jingqi Lin,Ahmed A. Allam,Jamaan S. Ajarem,Peter K. J. Robertson,Chuanyi Wang
Photocatalysis is an effective technology for NO removal even at low concentrations in the ambient atmosphere. However, the low efficiency of this advanced process and the tendency of producing toxic byproducts hinder the practical application of photocatalysis. To overcome these problems, the Bi@Ba2TiO4/BaBi4Ti4O15photocatalytic composites were successfully prepared by a one-step hydrothermal method. The as-synthesized photocatalysts exhibited an efficient photocatalytic performance and generated low amounts of toxic byproducts. X-ray diffraction studies show that Bi3+is successfully reduced on the surface of Ba2TiO4/BaBi4Ti4O15(BT/BBT). After L-Ascorbic acid (AA) modification, the photocatalytic NO removal efficiency of Bi@Ba2TiO4/BaBi4Ti4O15is increased from 25.55% to 67.88%, while the production of the toxic byproductNO2is reduced by 92.02%, where the initial concentration of NO is diluted to ca. 800 ppb by the gas stream and the flow rate is controlled at 301.98 mL·min−1in a 150 mL cylindrical reactor. Furthermore, ambient humidity has little effect on the photocatalytic performance of theBi@Ba2TiO4/BaBi4Ti4O15, and the photocatalyst exhibits excellent reusability after repeated cleaning with deionized water. The improved photocatalytic effect is attributed to the addition of AA in BT/BBT being able to reduce Bi3+ions to form Bi nanoparticles giving surface plasmon effect (SPR) and generate oxygen vacancies (OVs) at the same time, thereby improving the separation efficiency of photogenerated carriers, enhancing the light absorption, and increasing the specific surface areas. The present work could provide new insights into the design of high-performance photocatalysts and their potential applications in air purification, especially for NO removal.Keywords:photocatalysis;BaBi4Ti4O15;surface plasmon effect;NO removal
研究领域:
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Beibei Wang,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
We report an unique 2D/2D Iodine doped BiOIO 3 /g-C 3 N 4 heterojunction was successfully prepared. The iodine doped BiOIO 3 was prepared by a simple solvent exchange method and combined with g-C 3 N 4 by solvothermal method . The prepared photocatalyst has potential application value in the future due to its excellent stable cycle property. BiOIO 3 nanoplates and g-C 3 N 4 nanosheets form a close interfacial contact directly, so the catalyst has higher charge transport efficiency and wide visible range due to the introduction of iodide ions. Synergistic heterojunction exhibits strong photocatalytic activity for degradation of NO at ppb-level under visible light , of which 30% Iodine doped BiOIO 3 /g-C 3 N 4 can achieve a maximum removal rate of 57% for NO. According to the experimental results of ESR and other experiments, a more complex Z-scheme photocatalytic mechanism is proposed, which has stronger redox ability than the traditional mechanism.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Huihui Li,Xiaoyong Wu,Shu Yin,Kenichi Katsumata,Yuhua Wang
Novel g-C 3 N 4 /rutile-brookite TiO 2-x N y composite photocatalysts were fabricated through a facile solvothermal approach. The effect of rutile phase TiO 2 with brookite TiO 2 and g-C 3 N 4 on the photocatalytic activity of g-C 3 N 4 /nitrogen-doped TiO 2 composite was studied. The photocatalytic performance of the photocatalyst was evaluated by measuring the degradation of NO gas under visible and UV light irradiation. It is suggested that g-C 3 N 4 /rutile-brookite TiO 2-x N y forms a Z-scheme photocatalytic system, which shows improvement on the photocatalytic activity than that of g-C 3 N 4 /single brookite TiO 2-x N y . By importing rutile phase TiO 2-x N y , the photogenerated electrons can efficiently transfer from rutile TiO 2 to g-C 3 N 4 , which results in the separation of electron and hole pairs, enhancing the photocatalytic ability. However, single brookite TiO 2-x N y can not remove the photogenerated electrons efficiently and the photocatalytic performances of composites decrease with g-C 3 N 4 amount increase.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jingye Zhao,Ping Li,Qi Zhang,Zhilu Ye,Yijing Wang,Jingyu Tian,Zhe Xu,Niancai Peng,Hui Ren,Xiaohui Zhang
The concentration of nitric oxide (NO) in exhaled breath is linked to respiratory diseases, requiring precise detection. Traditional two-dimensional (2D) carbon-based materials used in chemiresistive gas sensors suffer from high detection limits due to a lack of functional sites, while metal oxide sensors are limited by poor selectivity and high operating temperatures, restricting their development. Recently, metal–organic frameworks (MOFs) have emerged as an effective material for NO monitoring due to their superior selectivity; however, their inherent insulating properties hinder practical use. In this study, we synthesized Ni, Co-MOF-74-Carbon Nanotube (CNT) heterostructured nanoflowers, leveraging their bimetallic active sites and large specific surface area to enhance NO adsorption. This composite material, integrated with breathable nanofibrous membranes through physical deposition, exhibits high selection to NO, achieving a linear response range of 30 to 1000 ppb at room temperature and a limit of detection (LOD) of 18.6 ppb. This sensor can accurately detect NO levels in the exhaled breath of both healthy and diseased individuals, confirming its potential for respiratory disease diagnosis. Additionally, we developed a portable device integrating the Ni, Co-MOF-74-CNT-polyacrylonitrile (PAN) membrane, a microcontroller unit (MCU), and a Bluetooth module for real-time NO detection. The systematic design and successful validation of this portable gas sensor pave the way for future home-based real-time monitoring of airway inflammation.
研究领域:
材料科学
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医学诊断
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传感器技术
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DOI
高影响因子
PLASMA SCIENCE & TECHNOLOGY
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2017
·Vol. 19
·期 11
·115504
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IF 0.83
Xu CAO,Weixuan ZHAO,Renxi ZHANG,Huiqi HOU,Shanping CHEN,Ruina ZHANG
This paper discusses the conversion of nitric oxide (NO) with a low-temperature plasma induced by a catalytic packed-bed dielectric barrier discharge (DBD) reactor. Alumina oxide (Al2O3), glass (SiO2) and zirconium oxide (ZrO2), three different spherical packed materials of the same size, were each present in the DBD reactor. The NO conversion under varying input voltage and specific energy density, and the effects of catalysts (titanium dioxide (TiO2) and manganese oxide (MnOx) coated on Al2O3) on NO conversion were investigated. The experimental results showed that NO conversion was greatly enhanced in the presence of packed materials in the reactor, and the catalytic packed bed of MnOx/Al2O3 showed better performance than that of TiO2/Al2O3. The surface and crystal structures of the materials and catalysts were characterized through scanning electron microscopy analysis. The final products were clearly observed by a Fourier transform infrared spectrometer and provided a better understanding of NO conversion.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Huiyun Xia,Zeliang Wu,Wenshuo Zhang,Lifang Song,Xu Li,Liying Cui,Yanhui Niu
In this study, a BiOI/Bi 5 O 7 I photocatalyst is synthesized using a co-precipitation method. The degradation efficiency of NO can reach 70 % under visible light. Subsequently, water-based polyurethane is used as the film-forming matrix, and fluorinated silane is used as low surface energy components, a BiOI/Bi 5 O 7 I water-based polyurethane photocatalytic superhydrophobic coating (FBIU) is prepared by a layer-by-layer spraying technique. The high catalytic activity of BiOI/Bi 5 O 7 I comes from the heterojunction effect of the two semiconductors and the improved interface, which enables the degradation rate of NO to reach 76.9 %, accompanied by extremely low NO 2 conversion rate (<1 %). The wettability, chemical stability and mechanical stability of the FBIU coating are studied to investigate its impact on the long-term oxidative degradation performance of NO. And the self-cleaning characteristics and specific micro-nano structure of FBIU improve the wear resistance of the coating, manifested as a contact angle of 157.8° to water after 320 times of sandpaper polishing. Finally, based on the photocatalytic mechanism of BiOI/Bi 5 O 7 I semiconductor materials, a green long-term purification and degradation mechanism of NO by coatings is proposed. This can provide some insights into the design of air purification coatings for building exterior walls.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
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2021
·
IF 3.739
Han Wang,Shulan Wang,Jingqiao Zhang,Han Wang,Hui Li,Yi Zhao
Several mesostructured cellular foams (MCFs) were prepared and modified for NO adsorption. TMB, NH 4 F and n -heptane were used as swelling agents, and APTES was used as the modified agent. The morphological structure, chemical composition, thermostability were tested to study the effects of the preparation process on the characterizations of materials. NO adsorption ability of the materials were studied and discussed. NH 4 F and n -heptane had better pore swelling effects compared to TMB, however adding TMB together with NH 4 F and n -heptane could not enlarge the pore structure further. The MCFs materials could keep steady below 800 °C, but after grafting APTES on the surface of the materials, the thermogravimetric curve of materials began to decrease at 300 °C. The materials using NH 4 F and n -heptane as the swelling agents, and modified by APTES had better NO adsorption ability, and the selectivity of the materials were decided by the molecular polarity of the adsorbates. After the modification, the hydrophobic effect of the samples could increase because of the alkyl groups in APTES. The adsorption capacity of the materials could keep steady for ten times without the coexisting component, H 2 O, CO 2 and SO 2 all had negative effects on the regeneration of the materials.
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
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhongwei Li,Guochang Song,Xingyu Yang,Qiang Song
Activated carbon can be used to control NO x emissions in low-temperature flue gas, while improving its performance is challenging. NO adsorption on activated carbon was found significantly promoted with the presence of O 2 . Based on the analysis of NO adsorption characteristics under different atmospheres and corresponding desorption characteristics, NO oxidation, NO 2 migration and further conversion on activated carbon are proposed to cause the significant increase in NO adsorption capacity. Quantum chemical calculations conducted on the adsorption and reaction pathways of NO, O 2 , and NO 2 on different carbonaceous models clarified that the pathway of O 2 -promoted NO adsorption on activated carbon can be divided into two stages. In the first stage, O 2 adsorbs on active carbon atoms near the hydroxyl functional group and undergoes an oxidation reaction with gaseous NO to generate NO 2 . In the second stage, the desorbed NO 2 is re-absorbed on the saturated carbon atoms; the N-down adsorption configuration of NO 2 will not convert, while the O-down adsorption configuration of NO 2 will oxidize the active site to form C-O and release NO; the C-O further reacts with the gaseous NO 2 to form NO 3 - which stably remains. There are two types of active sites involved in the pathway. The active carbon atoms near the hydroxyl functional groups mainly play a catalytic role in the oxidation of NO, while the saturated carbon atoms mainly store nitrogen-containing components. The results can help improve the performance of activated carbon in adsorbing NO in low-temperature flue gas.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 9
·2452-2460
·
IF 4.4
Xiao Tan,Suitao Qi,Guangxu Cheng,Chunhai Yi,Bolun Yang
As the ideal NO removal technology, the biggest challenge associated with the direct catalytic decomposition of NO is the development of highly active deNOx catalysts at low temperatures. Herein, a composite metal catalyst, Rh(0.2)/NC-MnFe, was prepared via impregnation for the low-temperature direct decomposition of NO, which exhibited 99.6% NO conversion and 63% N2 selectivity at 150 °C, and nearly 100% NO conversion and 98% N2 selectivity at 200 °C. The characterization results showed that the Rh(0.2)/NC-MnFe catalyst possessed a regular nanocage structure, good crystallinity, and suitable specific surface area. Its excellent low-temperature activity was attributed to the transfer of the dissociated O of NO from the Rh active site to the NC-MnFe support, which effectively inhibited the deactivation of Rh. The mechanism analysis indicated that NO adsorbed on the Rh(0.2)/NC-MnFe catalyst surface can generate NO2− and NO3−, and then the adsorbed NO together with NO3− is converted to NO2− species accompanied by the release of N2O. At last, NO2− is decomposed to N2.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
Energies
·
2019
·Vol. 12
·期 15
·2966
·
IF 2.707
Pijian Gong,Xinxue Li
In this study, NaClO2was selected as a denitration oxidant. In order to clarify the mechanism of NaClO2as an oxidation agent for NO removal efficiency, the effects of H+and other factors (NaClO2concentration, temperature, and the other gas) on the NO removal efficiency were investigated. NaClO2showed a promotional ability on NO removal, whose efficiency increased with the increase of NaClO2concentration. One hundred percent removal efficiency of NO could be achieved when the NaClO2concentration was 0.014 mol/L. Furthermore, raising the reaction temperature benefited the removal of NO. The lower the pH, the better the NO removal efficiency. The promoting effect of H+on the NO removal was studied by the Nernst equation, ionic polarization, and the generation of ClO2. Under the optimal conditions, the best removal efficiency of NO was 100%. Based on the experimental results, the reaction mechanism was finally speculated.Keywords:sodium chlorite (NaClO2);wet scrubbing;removal efficiency;NO reaction mechanism
研究领域:
环境科学
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化学工程
✓ 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）