CRYSTENGCOMM
·
2023
·Vol. 25
·期 15
·2271-2279
·
IF 3.1
Jingwen Hou,Bernard A. Goodman,Yuchen Lu,Qunyue Zhang,Bin Huang,Long Chen,Shoulei Xu,Wen Deng,Dingkang Xiong
Synthetic Ti-doped delafossite (CuFe1−xTixO2) was prepared by solid state reaction of Fe2O3, CuO and TiO2, and crystals were successfully prepared by the optical floating zone method using a modified experimental protocol that produced crystals in <10% of the time used in previous work. The effects of Ti on the microstructure and magnetic properties of CuFeO2 were investigated. The nonlinear change of cell size may be the result of Ti4+ reduction to Ti3+. However, the Fe oxidation state was not affected by Ti doping, although some oxidation of Cu+ to Cu2+ was observed with the highest Ti contents. The two characteristic magnetic transition temperatures of CuFeO2 occurred at 17 K (TN1) and 11 K (TN2) in the undoped crystal, and these increased to 51 K and 20 K, respectively, in the crystal with x = 0.007, although there was no major change in the two magnetic transition temperatures in crystals with other doping concentrations. In an applied magnetic field of 500 Oe, the magnetization of the x = 0.007 sample was 22 times that of CuFeO2, and its magnetization curve shows the coexistence of regions with ferrimagnetic and antiferromagnetic properties. Furthermore, magnetic hysteresis loops revealed that the saturation magnetization (M) of the sample x = 0.007 is 4.15 emu g−1, but at higher Ti concentrations the M–H curves returned to pairwise linear temperature dependence. Overall, crystals of synthetic delafossite with greatly affected magnetic properties can be prepared by doping with a limited range of Ti contents.
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ANALYST
·
2023
·Vol. 148
·期 8
·1732-1742
·
IF 4.2
Chonghui Wei,Xuan Xie,Yue Mou,Shiqi Cheng,Jin Yang,Kaixin Xue,Kewei Yu,Xinru Lin,Chunfen Zhang,Yujie Zhao,Xingyu Luo,Yilin Wang
Dopamine (DA) plays an essential role in dopaminergic neuronal behavior and disease. However, current detection methods for discriminating the secretion of DA are hampered by the limitations of the requirement for bulky instrumentation and non-intuitive signals. Herein, we have controllably and proportionately integrated molybdenum disulfide (MoS2) with titanium dioxide (TiO2) to prepare MoS2@TiO2 nanocomposites (MoS2@TiO2 NCs) via a facile synthesis method. MoS2@TiO2 NCs with a certain reactant mass ratio have shown a significant enhancement in peroxidase-like activity with superiority of the nanocomposite structure compared to single MoS2 or natural enzyme. The method for catalyzing the decomposition of H2O2 by MoS2@TiO2 NCs and competition for hydroxyl radicals (˙OH) between the chromogenic agent and DA enable a sensitive, specific, and colorimetric DA analysis with a low detection limit of 0.194 μM and a wide linear detection range (0.8 to 100 μM). Because of the favorable detection performance, we were encouraged to explore and finally realize the visual detection of cellular DA secretion that is stimulated in a High-K+ neurocyte environment. Collectively, this method will provide a promising strategy for basic research in neuroscience with its portable, sensitive, and naked-eye detectable performance.
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PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Junying Song,Xiaofei Ren,Guicong Hu,Li Wang,Xiaolong Hu
In this study, natural sepiolite was employed as the support of TiO 2 for improving the photocatalytic degradation activity for indoor formaldehyde (HCHO) under solar light. The various TiO 2 /sepiolite composites were prepared to investigate the effect of TiO 2 loading amount and crystallization temperature on HCHO degradation performance. The composite with TiO 2 loading amount of 50% and 500 °C exhibited the optimal performance, whose mineralization rate was up to around 2.63 times higher than that of pure TiO 2 . The performance enhancement mainly resulted from the uniform deposition of TiO 2 with smaller grain size on sepiolite surface, leading to more exposed active sites, higher quantum efficiency and faster carrier separation efficiency. As a result, more active radicals were generated in composite thereby boosting the HCHO degradation performance. Overall, our study improve the understanding on the photocatalytic oxidation of HCHO by mineral-based photocatalyst , thereby promoting the practical application in indoor air purification.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Xueyang Qi,Yongjun Zhu,Lixin Song,Guixiang Peng,Wenbin Qu,Jie Xiong
The increasing accumulation of waste plastics has a range of negative impacts on the land and marine environments. Solar-driven methods of converting waste into useful chemicals and green energy H 2 are gaining attention due to their efficiency, stability and low cost. Here, flexible nickel phosphide/titanium dioxide/carbon nanofiber (Ni 2 P/TiO 2 /C NFs) film photocatalyst was prepared by electrospinning, heat treatment, hydrothermal method, and phosphate treatment. The obtained Ni 2 P/TiO 2 /C NFs presented a continuous homogeneous fibrous shape with TiO 2 NPs incorporation into the carbon NFs and Ni 2 P NPs coating on the surface of the NFs. The film exhibited promising flexibility and excellent light absorption performance. As a result, the Ni 2 P/TiO 2 /C NFs film was utilized to reform polyethylene terephthalate (PET) into a variety of organic products and clean energy H 2 under alkaline aqueous conditions. In addition, the flexible Ni 2 P/TiO 2 /C NFs film could be easily separated from the solution for recycling, and the stable hydrogen production performance was maintained after multiple cycles. This work applies an inexpensive and recyclable composite photocatalyst to the recycling of waste polyester, which is a crucial step towards the practical application of recyclable photocatalysts in resource recovery.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2023
·
IF 4.3
Xi Chen,Yu Huang,Xu Wang,Haibo Li,Lin Zhu,Xinyang Xu,Shaoyan Jiang
A novel, sample and economical method was used to prepare the new co-doped TiO 2 photocatalysts and evaluated for CO 2 photoconversion under visible-light irradiation. The La(NO 3 ) 3 -TiO 2 photocatalyst was obtained by the sol–gel method and then was heat treated with different concentrations of ammonia vapor. It was found that the synergistic modification of TiO 2 photocatalyst by La(NO 3 ) 3 and ammonia vapor could improve its photocatalytic performance under visible light. The photocatalytic assessment presented a significantly amelioration in CO 2 photoconversion, giving 3.078 μmol CH 4 production in 4 h. The structures and properties of the photocatalysts were characterized and analyzed by means of XRD, SEM-EDS, HRTEM, BET, XPS, FTIR, ICP-AES, UV–vis DRS and theoretical calculation. The performance of the photocatalyst could be correlated to contributions of various phenomena such as larger specific surface area and the co-exposed (1 0 1) and (0 0 1) facets of anatase TiO 2 . Finally, the most likely substituted structures were obtained. The results of DFT + U theoretical calculation showed that La and N could modify TiO 2 by replacing surface Ti atoms and internal O atoms, respectively.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chaorui Xue,Ruizhi Xue,Ruirui Huang,Xiangqian Fan,Huinian Zhang,Wenjing Zheng,Ying Li,Ning Li,Qing Chang,Shengliang Hu
Interfacial solar driven water evaporation (ISDWE) technology has been widely studied to desalinate seawater in aiming to alleviate the scarcity of clean water. In this paper, the ISDWE performance of Ti mesh was enhanced by anodized TiO 2 nanotube film and applied voltage, and the water evaporation rate increased from 1.20 kg•m −2 •h −1 to 2.48 kg•m −2 •h −1 . Due to hydrophilic and nanoporous nature of TiO 2 nanotube film, the solar absorptivity, wettability of Ti mesh was improved, the water evaporation enthalpy was reduced, and the water evaporation rate reached 1.98 kg•m −2 •h −1 . For the superior ISDWE performance with applied voltage, electrothermal effect and internal electrical filed were proved to be contributing factors. The solar irradiation can enhance the electrothermal effect for the semiconducting nature of TiO 2 . The internal electrical field can optimize the solar absorptivity and water evaporation enthalpy through doping TiO 2 and breaking water clusters. Moreover, the applied voltage also increased the salt-resistance property of Ti mesh coated with TiO 2 nanotube film. When increasing NaCl concentration, stable water evaporation rate was attainable under 1.2 V, whereas continuous deceleration of water evaporation occurred without external voltage. Therefore, our study provides strategies for achieving high efficient and salt-free seawater desalination by ISDWE technology.
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NANO
·
2023
·
IF 1.2
Yong Li,Manyu Liu,Mingqing Zhang,Yanfang Liu,Qinghua Zhao,Xin Li,Qianyu Zhou,Yuanfu Chen,Shifeng Wang
Photocatalytic technology is currently the most promising technology for environmental pollution control. The preparation of photocatalysts with excellent properties is the core of the development of photocatalytic technology. TiO 2 can form a heterojunction with g-C 3 N 4 , which can effectively inhibit the recombination of photogenerated electron–hole pairs, improve the mobility of photogenerated carriers, and thus improve the photocatalytic performance. In this study, NaCl was used as a template, and the loose and porous g-C 3 N 4 /TiO 2 heterojunction composite photocatalysts were prepared by the template method. Compared to the pure g-C 3 N 4 prepared by the conventional thermal polycondensation method and TiO 2 , the g-C 3 N 4 /TiO 2 heterojunction composite photocatalysts prepared in this study exhibited a greatly increased specific surface area, an improved light absorption performance, a significantly suppressed recombination of photogenerated electrons and holes. Furthermore, the g-C 3 N 4 /TiO 2 heterojunction composite photocatalysts exhibited excellent photocatalytic performance.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 3
·898-909
·
IF 5
Haohui Gu,Feng Liang,Xiaohan Wang,Shuaibing Wu,Gongye Lv,Haijun Zhang,Shaowei Zhang,Lilin Lu,Zhijun Dong
The design of heterojunction photocatalysts is regarded as a very effective method to solve the high recombination rate of photogenerated charge carriers for CO2 photoreduction into hydrocarbons, and interface engineering is urgently required to achieve high efficiency. Herein, graphitic carbon nitride (g-C3N4, CN) was uniformly grown on the surface of nitrogen-doped rutile TiO2 (NT) nanorods by in situ deposition, and a NT@CN core/shell step-scheme (S-scheme) heterojunction system composed of NT nanorods and g-C3N4 was synthesised. The as-synthesised heterojunction containing 55 wt% g-C3N4 delivered the highest CO2 photoreduction activity (33.35 μmol g−1 for CO) without additional cocatalysts or external sacrificial agents, which was 7.1 times higher than that of bare NT nanorods. This improved CO2 reduction activity was attributable to the large surface area and impactful S-scheme heterostructure, which imparted the catalyst with sufficient visible-light harvesting ability, promoted the segregation and transformation of the photoinduced charge pairs, and enhanced the redox ability of the carriers. Concurrently, the NT@CN photocatalyst exhibited excellent reusability and stability. This work offers a new basis for designing and preparing rutile TiO2-based S-scheme heterojunctions with enhanced CO2 reduction performance.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Xiaoshuang Kang,Guohui Dong,Tingting Dong
In this study, TiO2 samples are synthesized through two stages including hydrolysis and calcination. It is found that the addition of HCl in the hydrolysis stage could facilitate the formation of heterophase junction TiO2. By annealing at 300 °C in an argon atmosphere, interfacial oxygen vacancies (Vo) and surface Vo (distributed in the anatase phase) can be constructed in the heterophase junction TiO2. After photocatalytic experiments, it can be found that surface Vo and interface Vo have a synergistic effect in the production of photocatalytic reactive oxygen species (ROSs). Surface Vo can enrich O2 and transmit electrons to O2 on the surface of anatase. Therefore, the enriched O2 can be converted into •O2– and 1O2 easily. The interfacial Vo not only facilitate the electron transmission between the two phases but also change the electron transfer mode from I-scheme to Z-scheme. Thus, interfacial Vo make photogenerated electrons transfer to anatase and photogenerated holes leave in the rutile. These holes in the rutile part have high oxidation potential and can better oxidize H2O (or OH–) molecules to •OH. They can also oxidize •O2– to 1O2. This work promotes the further development of defect design and application in photocatalytic materials.
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ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Xing Liu,Yuzhang Lei,Xiu Zhu,Gonggang Liu,Chongqing Wang,Shanshan Chang,Xiang Zhang,Jinbo Hu
Wood has been a promising water purifier material on account of its abundant natural transport channels, easy processing, and renewability, which is mainly focused on its utilization in growth direction for effective separation.Wood veneer manufacured from raw wood block has a reversed-tree pore structure, and possesses advantages of low cost, easy fabrication, material saving, and abundant sources. To realize its functionalization and practicable application for membrane separation, modification of wood veneer is prerequisite. Herein, thin wood veneer with disparate utilization direction of wood was developed to design filter membrane loading TiO 2 nanoparticles for treatment of dye wastewater. Wood veneer with reversed-tree transport pathways exhibits unique porous structure, and filtering direction and wood growth direction is almost orthogonal generated numerous sinuous channels. Thereout, sufficient area for loading TiO 2 nanoparticles and contacting pollutants as well as appropriate water transport pathways at significantly shrinking thickness of wood (the thickness of 0.2 mm) can be provide by these sinuous channels. TiO 2 nanoparticles was first modified by (3-Aminopropyl)triethoxysilane with high positive charge, and immobilized on negatively charged wood surface through atmospheric impregnation via strong electrostatic attractive interaction. Vast quantities of exposed TiO 2 nanoparticles on wood cell lumens significantly enhance the adsorption ability for dye contaminants, resulting in a high membrane separation performance. The flux of TiO 2 /wood veneer membrane can achieve high level of 636.94 L/(m 2 h) with considerable methylene blue removal of 99.9% at 0.01 MPa. Meanwhile, it shows good cycling stability as well as decent flexibility and excellent mechanical strength. Moreover, the designed membrane with photocatalytic function of TiO 2 also displays impressive decontaminated and recycling ability. The flux can recover its pre-recession level after 10 h light irradiation. The designed TiO 2 /wood veneer with simple preparation process and excellent water treatment capacity exhibits promising results for practical wastewater treatment .
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ACS Applied Nano Materials
·
2019
·
IF 0
Yulu Zhou,Sizhuo Yang,Donghua Fan,Jake Reilly,Hongwei Zhang,Wei Yao,Jier Huang
We report a facile synthesis of carbon quantum dot (CQD)-sensitized TiO2/Pt nanocomposites as efficient and robust photocatalysts for light-driven proton reduction from water. We show that this method not only simplifies the synthetic procedure for such hybrid materials but also enhances the direct interaction between CQDs and TiO2, which facilitates charge transfer from CQDs to TiO2 and eventually improves its performance for light-driven H2 generation. To the best of our knowledge, this work represents the system with highest H2 generation efficiency among all CQD-sensitized materials.
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2019
·Vol. 216
·期 6
·1800669
·
IF 1.606
Yinhuan Chu,Hongkun Cai,Like Huang,Zhixue Xing,Yangyang Du,Jian Ni,Juan Li,Jianjun Zhang
A facile and low-temperature solution processed UV/ozone process has been proposed for fabricating TiO 2 layer, making it possible to fabricate planar perovskite solar cells at low temperature. UV/ozone photo-annealing treatment could easily eliminate the organic components, resulting in high quality amorphous TiO 2 films with high transparency, electrical conductivity, and hydrophilicity. In addition, perovskite solar cells with the UV/ozone-treated TiO 2 electron transport layer exhibiting the best power conversion efficiency of 11.58% for rigid substrate and 7.33% for flexible substrate, respectively. The results clearly indicate that UV/ozone photo-annealing treatment is a simple and effective process of fabricating high performance flexible perovskite solar cells.
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