JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 85
·期 2
·394-401
·
IF 1.575
Qian Xin,Han Huanre,Chen Yulong,Yuan Ye
Abstract In this study, an attempt is done to synthesize anatase/brookite/rutile TiO 2 nanocomposites via a simple solvothermal method with hydrochloric acid, dehydrated ethanol, and titanium butoxide in a sol−gel environment. The effect of preparation temperature on the content of each phase, crystallite size, morphology, and photocatalytic activity was systemically studied. The structures of the products prepared under different temperatures were characterized using X-ray diffraction analysis, transmission electron microscopy, Raman spectra, and BET surface area. The optical properties were measured by UV–vis diffuse reflectance spectra. Besides, the photocatalytic activities were evaluated by performing the degradation of rhodamine B azo dye under UV−vis radiation. The results reveal that the content of different phases and crystallite size can be tailored via tuning the solvothermal condition. In addition, the obtained TiO 2 nanocomposites are a kind of mesoporous materials and have large BET surface area, narrow pore size distribution, and low band gap, which exhibit excellent photocatalytic performance (of activity about 4.40 times that of Degussa TiO 2 P25). Through examining the photocatalytic stability, the obtained TiO 2 nanocomposites exhibit a very stable photocatalytic performance. Therefore, the current method to TiO 2 preparation could provide a simple and reliable route for developing photocatalytic materials with high photocatalytic activity. Graphical abstract
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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Min Chen,Jianhua Chen,Chuncheng Chen,Changbin Zhang,Hong He
Modification of TiO 2 with copper oxides clusters (CuO x -TiO 2 ) induces visible-light absorption and enhances its activity. In this work, we investigated the CuO x -anatase and CuO x -rutile for the photocatalytic oxidation of gaseous NH 3 under visible light. In contrast with the widely reported results that CuO x -anatase displays higher performance than CuO x -rutile in photocatalytic oxidation or reduction, we surprisingly observed that CuO x -rutile is able to oxidize NH 3 efficiently under visible light irradiation, while CuO x -anatase shows no activity. Further characterizations showed that visible-light inclines to drive the VB electrons of rutile TiO 2 to CuO x at the interface between rutile TiO 2 and CuO x , while it drives the electrons of CuO x to anatase TiO 2 at interface between anatase TiO 2 and CuO x . DFT calculations revealed that the interaction between CuO x and TiO 2 is markedly different in CuO x -anatase and CuO x -rutile, which induces the differences in the electronic distribution of interfacial Cu, O and Ti atoms, resulting in the distinct direction of charge transfer.
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
Nanomaterials
·
2022
·Vol. 12
·期 21
·3906
·
IF 5.719
Dayu Li,Kai Xu,Chao Zhang
In this study, multiple heterojunction structures of anatase–rutile/Bismuth oxyiodide (BiOI) composite fibers are designed by the combined method of electrospinning and hydrothermal techniques. The influence of different Ti/Bi atomic ratios ([Ti/Bi]) on the nanostructures and photocatalytic properties are investigated. It is found that the morphology of BiOI covered on the TiO2fiber surface changed with [Ti/Bi] from nanosheets to submicron spheres structures. Additionally, the crystallization of the composite fibers including the phases of anatase, rutile, and BiOI is identified, theses phases are in close contact with each other, and the interfacial effects are helpful to form the multiple heterojunctions which lead to blue shifts on the chemical state of Ti. The absorption of visible light has been improved by compositing BiOI on TiO2, while the band gap values of the composite fibers are significantly reduced, which can enhance the generation and separation of electrons and holes. For the case of [Ti/Bi] = 1.57, the photodegradation rate of anatase–rutile/BiOI composite fibers is about 12 times that of pure TiO2. For the photocatalytic mechanism, the synergistic s-type heterojunctions increase the content of active oxides which have a positive effect on the degradation rate.Keywords:photocatalysis;hydrothermal synthesis;multiple heterojunction structure;anatase–rutile/BiOI;composite fiber
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
RSC Advances
·
2022
·Vol. 12
·期 19
·12219-12225
·
IF 4.036
Yang Song,Yuchong Kang,Wei Ma,Haibo Li
Herein, a facile one-step method is developed to in situ prepare crystalline anatase and rutile TiO2 nanocrystals on Ti3C2Tx by regulating the metastable Ti ions. The combination of TiO2 nanocrystals and Ti3C2Tx not only introduces extensive accessible sites for Na+ storage, but also promotes the charge transport by efficiently relieving the collapse of Ti3C2Tx. Compared with pristine Ti3C2Tx, the optimized TiO2/Ti3C2Tx hybrid electrode (anatase/rutile-TiO2/Ti3C2Tx, A/R-TiO2/Ti3C2Tx) exhibits a desirable specific surface area (22.5 m2 g−1), an ultralow charge transfer resistance (42.46 Ω) and excellent ion diffusion (4.01 × 10−14). Remarkably, rich oxygen vacancies are produced on TiO2/Ti3C2Tx which is beneficial to enhance the insertion/de-insertion of Na+ during the charge/discharge process. As a result, the A/R-TiO2/Ti3C2Tx delivers a high average capacity of 205.4 mA h g−1 at 100 mA g−1 and a desirable capacitance retention rate of 84.7% can be achieved after 600 cycles at 500 mA g−1.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yubin Sun,Shuming Wen,Qicheng Feng,Yanyu Tang,Yongchao Miao,Xu Wang,Zhihao Shen
This work explored the application of sodium lauroyl sarcosinate (SLAS) as a green surfactant in rutile flotation systems. A detailed examination of the flotation behavior and adsorption characteristics of rutile was conducted, particularly under Pb 2+ ion-modified conditions. The experimental methodology incorporated multiple analytical techniques: micro-flotation experiments, surface potential analysis, adsorption quantification, FTIR spectroscopy, SEM-EDS characterization, XPS surface analysis, and computational DFT simulations. Micro-flotation experiments demonstrated that under the optimal conditions (SLAS concentration of 2.8 × 10 −4 mol/L, pH 3), a rutile recovery of 81.49 % was obtained. Notably, as the pH increased, the recovery of rutile exhibited a decreasing trend. Following Pb 2+ modification (8.0 × 10 −5 mol/L) combined with SLAS treatment (2.8 × 10 −4 mol/L), the rutile demonstrated consistent flotation recovery exceeding 90.02 % across a broad pH range (3 ∼ 7). The adsorption capacity experiments and SEM-EDS results indicated that multiple SLAS layers were adsorbed on the rutile. Moreover, Pb 2+ modification improved the favorability of SLAS adsorption. A combination of surface potential measurements and infrared spectroscopy confirmed the chemical adsorption mechanism of SLAS on positively charged rutile surface atoms. XPS characterization confirmed that the SLAS oxygen atoms chemically bonded with the rutile surface Ti/Pb atoms. DFT simulations demonstrated that the adsorption processes were spontaneous, with Pb 2+ and SLAS respectively, forming O − Pb and Ti − O bonds on the (110) surface. This mechanism explains how Pb 2+ enhances the SLAS adsorption capacity and subsequent flotation efficiency of the rutile. These studies proved the industrial potential of environmentally friendly collector SLAs in rutile flotation.
研究领域:
矿物加工工程
·
表面化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guanzheng Wang,Zhong Liu,Wenjiang He,Zhentao Yuan,Lu Li,Zhaolin Zhan,Xiao Wang
Despite the advantages of TiO 2 , such as its low cost, long lifespan, and excellent thermodynamic/kinetic properties, its inherent slow ion diffusion limits its commercial application. Therefore, in this work, a three-dimensional(3D) mesoporous rutile TiO 2 hollow sphere suitable for high-energy-density pseudocapacitance and rapid lithium storage was meticulously designed. The average diameter of the hollow spheres is approximately 1.6 μm, with individual mesoporous-spheres assembled from 50 to 300 nm nanoparticles, and the hollow spheres exhibit a high specific surface area of ~58.57 m 2 g −1 and a large pore size of ~14.18 nm. The results demonstrate that the electrochemical performance of 3D rutile TiO 2 hollow sphere samples is superior to that of conventional microsized particles. Specifically, the MS-TiO 2 –2 sample retained a high capacity of 295 mAh g −1 after 100 cycles at 0.5C. After 1000 cycles at 1C and 5C, the reversible specific capacities of MS-TiO 2 –2 were 254 and 174 mAh g −1 , respectively. Its pseudocapacitive contribution reached as high as 82 % under a fast cyclic voltammetry scan at 10 mV s −1 . These excellent electrochemical properties are attributed to the unique design and regulation of the three-dimensional mesoporous structure. The precise control of porosity is the primary reason for the optimal electrochemical performance of MS-TiO 2 –2. This anode with the 3D mesoporous structure enables rapid Li + transport, which is of great significance for the design of high-energy-density pseudocapacitors and fast Li + batteries.
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 10
·1126
·
IF 3.52
Jun Liu,Xuli Li,Haobo Hou,Min Zhou
To further boost the charge separation and photocatalytic activity of TiO2under visible light, the anatase–rutile mixed-phase nitrogen-doped (N-doped) TiO2nanoparticles were successfully synthesized through a facile one-step calcining procedure using TiN as raw materials. The crystal phases, morphologies, chemical compositions, textural structures, and optical properties of as-obtained N-doped TiO2were characterized by the corresponding analytical techniques. The photocatalytic activities of as-fabricated samples were evaluated by degrading 4-chlorophenol (4-CP) and methylene blue (MB) aqueous solution under visible light irradiation. The results revealed that the ratio of rutile to anatase increased with the improvement of sintering temperature, and the sample prepared at 500 °C had the best photocatalytic activity. This might be because it possessed the most appropriate rutile/anatase proportion as well as the nitrogen doping. The transient photocurrent responses, photoluminescence spectra (PL) measurements, and active species trapping experiments were implemented to disclose the photocatalytic mechanism. This work will provide a further insight into the synthesis of highly efficient N-doped TiO2photocatalysts for organic contaminant removal.Keywords:N-doped TiO2;charge separation;photocatalytic activity
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
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 8
·3666-3674
·
IF 3.5
Amir Said,Guanjie Chen,Guanyun Zhang,Dexin Wang,Yanshu Liu,Fangfang Gao,Guo Wang,Chen-Ho Tung,Yifeng Wang
Titanium-oxide clusters (TOCs) are well-defined molecular models for TiO2 materials and provide the opportunity to study the structure–activity relationships of TiO2. Here, we report a new Pb-doped TOC, Ti12Pb2, which resembles a two-layer decker of the {TiTi6} structural units of rutile TiO2 with two Ti4+ ions replaced by two Pb2+ ions. Its electronic structure, photoresponse, and photocatalytic performances were investigated and compared with those of the Ti14 cluster, which is isostructural to Ti12Pb2. Our results indicate that Pb2+ does not affect the electronic structure, but it greatly enhances the photocatalytic activity by improving the charge-separation and interfacial charge-transfer properties of the TOC. The successful synthesis of Ti12Pb2 highlights the roles of closed-shell heterometal ions in the construction of new TOCs. Our mechanism may be an inspiration for understanding the structure–activity relationships of closed-shell heterometal-doped TiO2.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2014
·Vol. 36
·期 1
·8-16
·
IF 1.455
Yake Man,Luye Mu,Yun Wang,Shaohui Lin,Garry L. Rempel,Qinmin Pan
Rutile titanium dioxide (TiO 2 )/poly(methyl methacrylate-acrylic acid-butyl acrylate) nanocomposites were synthesized via seeded emulsion polymerization and characterized by Fourier transmission infrared, dynamic light scattering, X-ray diffraction, ultraviolet–visible (UV–vis) spectroscopy, scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis to study their UV-shielding property. The effects of the nanoseed types, surfactant concentrations, and functional monomer amounts on the polymerization conversion, particle size, emulsion stability, and morphologies of the resulting nanocomposites were investigated. The dependence of UV-shielding performance on the nanoparticle content and dispersion was also explored. The optimized results are obtained with 2 wt% of TiO 2 nanoparticles addition, and the effectiveness of UV shielding is significantly increased by using the synthesized rutile nano-TiO 2 /polyacrylates, for which the nanocomposite coating with a thickness of 200 μm could block up to 99.99% of UV light (≤350 nm) as confirmed by UV–vis spectrometry. POLYM. COMPOS., 36:8–16, 2015. © 2014 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
NPG Asia Materials
·
2016
·Vol. 8
·期 3
·e243
·
IF 8.772
Ning Chengyun,Yu Peng,Zhu Ye,Yao Mengyu,Zhu Xiaojing,Wang Xiaolan,Lin Zefeng,Li Weiping,Wang Shuangying,Tan Guoxin,Zhang Yu,Wang Yingjun,Mao Chuanbin
Bone has a built-in electric field because of the presence of piezoelectric collagen. To date, only externally applied electric fields have been used to direct cell behavior; however, these fields are not safe or practical for in vivo use. In this work, for the first time, we use a periodic microscale electric field (MEF) built into a titanium implant to induce osteogenesis. Such a MEF is generated by the periodic organization of a junction made of two parallel semiconducting TiO 2 zones: anatase and rutile with lower and higher electron densities, respectively. The junctions were formed through anatase–rutile-phase transition in selective areas using laser irradiation on the implants. The in vitro and in vivo studies confirmed that the built-in MEF was an efficient electrical cue for inducing osteogenic differentiation in the absence of osteogenic supplements and promoted bone regeneration around the implants. Our work opens up a new avenue toward bone repair and regeneration using built-in MEF.
研究领域:
生物材料
·
组织工程
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Hongxiang Wu,Yibo Wang,Zhaoping Shi,Dongchen Han,Jiahao Yang,Pengbo Wang,Jing Ni,Meiling Xiao,Changpeng Liu,Wei Xing
The successful deployment of proton-exchange membrane water electrolyzers (PEMWEs) relies on the development of an active and durable electrocatalyst for the anodic oxygen evolution reaction (OER). Although rutile IrO2 shows excellent durability due to its stable crystal structure, it suffers from unsatisfactory activity. Here, we report a partial Sn substitution strategy to trigger lattice oxygen reactivity toward boosted OER. The similar crystal structures of IrO2 and SnO2 promote uniform incorporation of Sn into the lattice of IrO2, thus retaining the durability of the pristine rutile phase. More importantly, the electron transfer from Ir to Sn through the local structure of Ir–O–Sn was found to enhance the Ir–O bond covalency, which in turn activated the lattice oxygen to participate in OER. The enhanced lattice oxygen mechanism (LOM) was further verified by in situ 18O isotope labeling in situ differential electrochemical mass spectroscopy (DEMS). Due to these attributes, the as-designed Ir0.83Sn0.17O2 catalyst showed significantly improved performance, with an overpotential of only 284 mV at a current density of 10 mA cm–2, 38 mV lower than that of the commercial IrO2. In addition, the mass activity of the Ir0.83Sn0.17O2 catalyst reaches as high as 130 A gIr–1 at 1.55 V, which is 2.58 times higher than that of commercial IrO2. Beyond that, the intrinsic stability of the rutile phase endows the Ir0.83Sn0.17O2 catalyst with excellent operational durability. This work provides a novel insight into the improvement of catalyst activity and inspires the design of highly active and stable OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Faxiang Lu,Xiumin Xu,Yang Cao,Xingfu Zhou
The electron transport layer (ETL) plays an important part in perovskite solar cell (PSC) devices. TiO 2 nanorod arrays (TiO 2 NAs) is widely used as ETL for perovskite solar cells because of its excellent energy level matching. Furthermore, TiO 2 NAs provide the directed 1-D electron transmission channel. In this work, rutile TiO 2 NAs synthesized by one-step hydrothermal method were used as the ETL of carbon-based perovskite solar cells to improve the performance. The interface between the ETL and perovskite was modified by barium acetate to reduce interface defects, non-radiative recombination and improve the electron transport rate. The perovskite film based on the Ba@TiO 2 NAs exhibited larger grains and fewer grain boundaries, which was of positive significance for improving the power conversion efficiency (PCE) of devices. At the same time, we replaced the precious metal electrode and unstable organic hole transport layer (HTL) with carbon electrode, which reduces the manufacturing cost and improves the stability of the device. Finally, all inorganic HTL-free carbon-based perovskite solar cells based on Ba@TiO 2 NAs showed a champion PCE of 10.74%, which is 14.74% higher than the control device.
研究领域:
材料科学
·
能源科学
✓ 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）