SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Yuanzheng Zhang,Chao Liang,Kaihang Zhang,Yuxin Zeng,Yufei Zhou,Xiaoxia Zhang,Lifeng Yin,John Crittenden,Junfeng Niu
The persistent challenge of nitrate (NO 3 – ) pollution in water systems, profoundly impacting ecosystems and human health, demands effective remediation strategies. Here, we present an innovative S-scheme Cu@CN/TiO x heterojunction for high-efficiency photocatalytic denitrification (PCDN). Evaluation of its performance demonstrates exceptional NO 3 – removal efficiency (99.5%) and remarkable N 2 selectivity (95.5%), with 13.7 and 4.1 times higher rate constants of NO 3 – removal than the individual Cu@CN and TiO x components. Notably, this catalyst exhibits impressive stability across multiple cycles, maintaining consistent high conversion rates and selectivity. Mechanistic insights unveiled a tandem reaction pathway where Cu@CN selectively reduced NO 3 – to NO 2 – , followed by the TiO x -mediated CO 2 • – generation, enabling highly selective NO 2 – to N 2 conversion. This unique catalytic system, featuring spatially separated redox-active sites, presents a promising avenue for efficient, selective, and stable denitrification processes, offering significant potential in addressing water pollution challenges and advancing tandem catalytic systems.
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
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Junhao Cai,Yaru Peng,Po Hu,Yuan Zhou,Qiaoge Yao,Hao Lyu,Youtang Gao
The light absorption, active sites, and charge carriers separation of photocatalysts are extremely important factors in the field of photocatalysis. Near-perfect lattice-matched homojunction constructed using disorder engineering and doping strategies is an effective strategy to improve photocatalytic activity. Herein, we developed crystalline TiO 2 nanoparticles (NPs) and Ti 3 C 2 T x MXene-derived C-doped amorphous TiO x homojunction (TCT) at room temperature. In this homojunction, TiO 2 NPs are evenly distributed on the surface of the C-TiO x nanosheet to form a type-II structure, which promotes the separation of photogenerated carriers. The light absorption range of TCT extends to 550 nm due to the presence of intermediate energy levels in C-TiO x , which increases its photon absorption capacity. Moreover, TCT possesses a large number of oxygen vacancies, which are beneficial for improving the adsorption and degradation of pollutants. These characteristics of TCT could significantly improve its photodegradation performance for tetracycline. Interestingly, the precursor mass ratio of TCT with the best degradation efficiency is different under different illumination conditions, which is attributed to the different band gaps of C-TiO x and TiO 2 NPs resulting in different light absorption ranges. This work provides a new approach to rationally designing crystalline and amorphous homojunction for photocatalytic 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
FUEL
·
2023
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IF 7.4
Jiali Zhou,Ge Li,Hongfei Li,Ziran Ma,Shuang Liu,Xiaolong Tang
Sintering is among the most challenging obstacles preventing the development of platinum catalysts that highly effective for hydrocarbon combustion at low temperatures. To overcome this obstacle, a Pt@TiO 2 catalyst with platinum nanoparticles encapsulated by TiO x overlayers was synthesized in this article, via melamine-mediated calcinations at 800 °C in air. Being physically constrained (“protected”) and electronically buffered (“Pt x + /Pt 0 ↔ Ti 3+ /Ti 4+ ”) by the thermally stable TiO x , this catalyst preserved a large amount of reactive metallic Pt 0 sites, which therefore exhibited obviously higher activity for C 3 H 8 and C 3 H 6 combustion in comparison with conventional supported Pt/TiO 2 catalysts. Moreover, steam and SO 2 in the reaction atmospheres caused reversible influences on the catalytic performance of this sample, indicating the high practical potential of such a recipe for the design of platinum catalysts with superior activity and durability for hydrocarbon combustion.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Yangjun Luo,Yanwei Wang,Youyuan Wang,Heming Huang,Li Zhang,Huijuan Zhang,Yu Wang
Although various alloys have been extensively explored to enhance catalyst activity and stability in oxygen reduction, degradation of performance due to long-term operation has plagued the crowd. Here, we develop a catalyst synthesis strategy based on the coexistence of monoatomic Fe and Pt-based clusters/alloys on NC/TiO x . Fe/PtCo-NC/TiO x exhibits a half-wave potential of 0.948 V and mass activity of 3.69 A mg Pt −1 at 0.9 V, the latter being approximately 32.1 times higher than that of 20% Pt/C (0.115 A mg Pt −1 ). Additionally, it also shows maximum power densities of 952.2 mW cm −2 and 215.8 mW cm −2 in the H 2 /O 2 fuel cell and Zn-air battery, respectively. The combination of illumination and calcination promotes the electron transfer between Pt and TiO x , thus enhancing the catalytic activity and stability. We also explore the approach and mechanism of using illumination to suppress catalyst performance degradation. The intermittent irradiation inhibits the dissolution of Pt to facilitate the Fe/PtCo-NC/TiO x durability beyond that of most reported metal catalysts, with a half-wave potential degradation of only 14 mV after 30,000 cycles. The ingenious use of illumination provides a simple and feasible strategy for the sustainable utilization of catalysts.
研究领域:
材料科学
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催化化学
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能源科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2013
·Vol. 1
·期 20
·6138-6144
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IF 0
Hongye Zhang,Yanfei Zhao,Sha Chen,Bo Yu,Jilei Xu,Huanjun Xu,Leiduan Hao,Zhimin Liu
Ti3+ self-doped TiOx@anatase core–shell structures were prepared via hydrolysis of Ti2(SO4)3 around TiO particles, followed by post-calcination at temperatures from 723 to 823 K. The as-prepared TiOx@anatase was examined by means of transmission electronic microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. It was demonstrated that the samples displayed core–shell structures with the shell in the anatase form and the core in the anatase and rutile phases, and a large number of Ti3+ ions were present. Electron paramagnetic resonance analysis indicated that the Ti3+ ions were located throughout the whole sample, including the shell, the core and the interface between the core and the shell. The as-prepared TiOx@anatase core–shell catalysts can absorb visible light and showed good activity for catalyzing the degradation of Rhodamine B under visible light irradiation. In particular, the TiOx@anatase obtained at 773 K showed the best performance, due to the high concentration of well-dispersed Ti3+ ions in the sample.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Jie Xu,Hongji Li,Huimin Feng,Yuqin Ma,Dandan Wang,Jianwei Zhu
The removal of refractory organic contaminants in the environment is vital, but developing highly active catalysts with a simple synthesis process remains a challenge. Herein, NH 2 -MIL-125(Ti) (Ti-MOF) as a template, Ti 3+ -TiO x clusters of different quantities were embedded in the CdIn 2 S 4 nanosheets to construct Ti 3+ -TiO x /CdIn 2 S 4 (TiCIS) heterojunction by an in-situ self-assembly strategy, which had a hollow structure, strong visible light absorption, high separation rate of carriers, and more active sites. During the degradation experiment of Rhodamine B (RhB), TiCIS25 exhibited the best photocatalytic performance, and 98.0% of RhB was degraded within 60 min of visible irradiation. The intermediates in the RhB degradation and their ecotoxicity were analyzed, which revealed that RhB degradation was a detoxification process. The radical trapping experiments and electron spin resonance (ESR) tests indicated that e - , 1 O 2 , and ·O 2 - are the main active species for RhB degradation. Moreover, a possible photocatalytic mechanism was proposed based on electrochemical tests. The photodegradation performance of the as-prepared TiCIS catalyst under different reaction parameters (authentic water matrices, initial pH, coexisting anions, organic matter concentration, actual sunlight, reaction temperature, and multiple pollutants) and circulating experiments, as well as the photo-reduction process CO 2 , reflected that TiCIS25 possessed excellent practicability, cyclic stability, and universal applicability. Above all, TiCIS25 exhibited great potential in photocatalytic processes, and the work provided a feasible strategy for designing high-performance photocatalysts .
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
Materials Research Express
·
2019
·Vol. 6
·期 7
·076430
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IF 1.449
Ying Tao,Daocheng Pan
Transparent conductive thin films play an important role in antistatic coating. In this work, highly robust Ag nanowires/TiOx hybrid transparent conductive thin film was deposited by a one-step and low-temperature method. Firstly, 4.2 g of silver nanowires and 1.0 liter of TiOx sol-gel solution were synthesized. The Ag nanowire dispersion and TiOx sol-gel solution were mixed and sprayed onto many types of substrates, including glass, wood and marble. Highly robust Ag nanowires/TiOx hybrid thin film with a sheet resistance of 7–102*/□ and transmission of 63%–84% can be obtained by a low-temperature sintering process or by UV/ozone irradiation at room temperature. Our results indicated that low-cost and robust Ag nanowires/TiOx hybrid thin films have a high potential in antistatic coating.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
RSC Advances
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2018
·Vol. 8
·期 39
·21975-21984
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IF 2.936
Zideng Dai,Xue-Zhi Song,Junkai Cao,Yunping He,Wen Wen,Xinyu Xu,Zhenquan Tan
Biological applications of nanosheets are rapidly increasing currently, which introduces new possibilities to improve the efficacy of cancer chemotherapy and radiotherapy. Herein, we designed and synthesized a novel nano-drug system, doxorubicin (DOX) loaded titanium peroxide (TiOx) nanosheets, toward the synergistic treatment of lung cancer. The precursor of TiO2 nanosheets with high specific surface area was synthesized by a modified hydrothermal process using the polymer P123 as a soft template to control the shape. TiOx nanosheets were obtained by oxidizing TiO2 nanosheets with H2O2. The anti-cancer drug DOX was effectively loaded on the surface of TiOx nanosheets. Generation of reactive oxygen species, including H2O2, ·OH and ·O2−, was promoted from TiOx nanosheets under X-ray irradiation, which is effective for cancer radiotherapy and drug release in cancer cells. In this way, chemotherapy and radiotherapy were combined effectively for the synergistic therapy of cancers. Our results reinforce the DOX loaded TiOx nanosheets as a pH sensitive and X-ray controlled dual-stimuli-responsive drug release system. The cytotoxicity, cellular uptake, and intracellular location of the formulations were evaluated in the A549 human non-small cell lung cancer cell line. Our results showed that TiOx/DOX complexes exhibited a greater cytotoxicity toward A549 cells than free DOX. This work demonstrates that the therapeutic efficacy of DOX-loaded TiOx nanosheets is strongly dependent on their loading mode and the chemotherapeutic and radiotherapy effect is improved under X-ray illumination, which provides a significant breakthrough for future applications of TiOx as a light activated drug carrier in cancer chemotherapy and radiotherapy.
研究领域:
纳米技术
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癌症治疗
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药学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Solar RRL
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2025
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IF 4.7
Yongliang Lai,Bowen Liu,Dongdong Shen,Zhuoer Deng,Xinan Shi,Daocheng Pan
Indium tin oxide (ITO) is usually served as the transparent conductive electrode of Cu(In, Ga)(S, -Se) 2 (CIGSSe) solar cells. However, ITO is fabricated by sputtering method, which will increase the cost of CIGSSe solar cells and prevent its large-scale market applications in the future. Hence, it is particularly important to develop low-cost transparent conductive window layers to replace the traditional ITO. Silver nanowires (AgNWs) are considered to be the most promising alternative to ITO. Compared with sputtered ITO, AgNWs have the advantages of high transmittance, low cost, and easy fabrication. Nevertheless, the poor adhesion and stability of AgNWs can prevent the transportation of carriers of CIGSSe solar cells. Here, we select amorphous TiO x as an adjuvant to fabricate AgNWs/TiO x composite transparent conductive layer to substitute the traditional ITO. Under the assistance of TiO x matrix, not only the connection, adhesion, and stability of AgNWs are greatly enhanced, but also the surface roughness of AgNWs is also reduced. The influence of AgNWs concentration on the performance of CIGSSe solar cells is investigated. When the AgNWs concentration is 2.5 mg/mL, the transmittance and sheet resistance of AgNWs thin film are 93.35% and 93 Ω/sq, respectively, and the devices achieved the highest efficiency of 13.59%.
研究领域:
材料科学
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能源技术
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光电技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Hainan Shi,Jun Du,Haozhi Wang,Zhenghao Jia,Dingfeng Jin,Jiaqi Cao,Jungang Hou,Xinwen Guo
Solar-driven CO 2 conversion into fuels is a promising solution toward green energy conversion. It is a challenge to regulate the precise structure of photocatalysts at the atomic scale, facilitating the charge transfer and improving CO 2 photoreduction performance. Herein, conductive Ti 3+ -rich TiO x clusters with unsaturated Ti–O 5 coordination incorporated into nanosheets-assembled hollow sulfide semiconductors were prepared through a versatile transformation strategy by using NH 2 -MIL-125(Ti) metal–organic–framework as precursor. This typical photocatalysts exhibit highly selective photoreduction of CO 2 , achieving a super high visible-light photocatalytic CO evolution activity of 1100 μmol g −1 h −1 . The active sites were identified on the surface of conductive TiO x clusters, inducing efficient trapping of photogenerated electrons at the interface and suppressing H 2 generation. This enhanced performance is ascribed to Ti 3+ -rich TiO x clusters as an efficient cocatalyst on sulfide semiconductor providing more active sites due to electrical conductivity and unsaturated coordination environment. This work provides a promising approach to enhance photocatalytic performance of the catalysts coupled by unique metal oxide clusters for selective photoreduction of CO 2 .
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Binbin Wu,Chaorui Xue,Chi Zhang,Jinfang Zhang,Qing Chang,Caihong Hao,Lei Liu,Ning Li,Xiangqian Fan,Shengliang Hu
At present, the limited efficiency in ammonia generation poses significant challenge to the widespread practical implementation of photocatalytic nitrogen reduction to ammonia (PNRN). In this study, we synthesized a nanoporous TiO x powder (Alloy-RTO) by rapid breakdown anodization of TA13 alloy and subsequent magnesiothermic reduction. The Alloy-RTO exhibited superior photothermal and photocatalytic properties owing to its multicomponent and interconnective nanoporous structure, and the electronic band structure is suitable for efficient PNRN. Notably, through synergistic integration of PNRN with solar-driven interfacial water evaporation technology (SDIWE), the ammonia production rate was further enhanced, and a multifaceted role of SDIWE in enhancing PNRN was proposed: (1) increasing temperature of Alloy-RTO to promote PNRN; (2) raising temperature to accelerate ammonia water decomposition and facilitate PNRN; and (3) generating plenty of gaseous water to accelerate PNRN. This study presents an effective strategy for preparing nanoporous TiO x and highlights the pivotal role of SDIWE in promoting PNRN.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Danhe Wang,Xiaomeng Xu,Tao Qiu,Na Ren,Haiyun Liu,Guoxin Fang,Zhen Liu
Coupled resonance at the noble metals and metal oxides heterogeneous interface can enhance the fluorescence of molecules. This fascinating direction provides high value for the preparation and engineering design of fluorescence sensing platforms in nucleic acid sensing, pathogen detection and biological imaging. Here, an integrated nucleic acid amplification sensor chip consists of an array of silver nanoparticles/oxygen vacancy titanium oxide (TiO x -Ag) heterostructure substrates. The femA gene of Staphylococcus aureus was amplified and detected by enhancement fluorescence on the integrated chip. The TiO x -Ag heterostructure array was prepared by a laser method, the enhanced fluorescence performance was investigated in detail using calcein as a probe. The optical, electronic structure and plasmonic local field analysis indicate the strong coupling between the fluorescence molecule and the TiO x -Ag crystal plane, which inspired the excellent fluorescence signal of calcein, with an enhancement factor of up to 5. Staphylococcus aureus was detected by the above chip with a detection limit as low as 157 cfu/mL. These methods were applied to the detection of spiked serum samples with good detected performances, providing a powerful tool for rapid and reliable diagnosis of pathogens in medical institutions.
研究领域:
生物传感
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纳米材料
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病原体检测
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）