Royal Society Open Science
·
2018
·Vol. 5
·期 8
·
IF 2.504
Haijin Liu,Peiyao Li,Haokun Bai,Cuiwei Du,Dandan Wei,Yuzhao Su,Yuqian Wang,Lin Yang
Anatase TiO2 with {001} facets is much more active than that with {101} facets, which has been verified via experiments and theoretical calculations. Graphene has garnered much attention since it was initially synthesized, due to its unique properties. In this study, reduced graphene oxide (RGO)/{001} faceted TiO2 composites were fabricated via a solvothermal method. The composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectrophotometry, photoluminescence and Raman analysis. The results revealed that the graphene oxide was reduced during the preparation process of the {001} faceted TiO2, and combined with the surface of {001} TiO2. The photocatalytic activities of the composites were evaluated through the degradation of basic violet, under both white light (λ > 390 nm) and visible light (λ = 420 nm) irradiation. The results indicated that the photocatalytic activities of the {001} faceted TiO2 were significantly improved following the incorporation of RGO, particularly under visible light irradiation. Theoretical calculations showed that the band structure of the {001} faceted TiO2 was modified via graphene hybridization, where the separation of photoinduced electron–hole pairs was promoted; thus, the photocatalytic activity was enhanced.
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
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Xipeng Li,Yingbo Chen,Xiaoyu Hu,Yufeng Zhang,Linjia Hu
Novel poly(vinyl alcohol) (PVA)/poly(vinylidene fluoride) (PVDF) hollow fiber composite membranes modified with nano-TiO 2 were prepared by a dip-coating method and they are suitable to be utilized in dye desalination and wastewater treatment . Glutaraldehyde (GA) was used as a cross-linker for the composite polymer membrane in order to enhance the chemical, thermal as well as mechanical stabilities. The surface morphologies and chemical structures of modified membranes were observed by scanning electronic microscopy (SEM), energy dispersive spectroscopy (EDS) and FTIR spectroscopy . Zeta potential of the membrane surface was used to analyze the membrane separation performance. Separation efficiency of dye and salts through novel PVA/PVDF composite membrane was dramatically influenced by dye concentration, salts concentration, pH and temperature of feed solution. Fouling and thermal stability of the membrane were also evaluated with CR, NaCl, and Na 2 SO 4 as model compounds. The separation datas showed that the 1 g/L nano-TiO 2 modified membrane presented highest performance in terms of the rejections to CR, MO, and MB being 94±2.57%, 52.1±2.45%, and 92±2.20%, respectively. And all the PVA composite membranes had no rejection to salts (NaCl, Na 2 SO 4 ). Compared with PVA composite membrane, the PVA composite membrane modified with nano-TiO 2 has higher separation efficiency, antifouling and thermal stability.
研究领域:
材料科学
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环境工程
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膜技术
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 131
·期 3
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IF 1.395
Peng Fei,Benhua Fei,Yan Yu,Hanguo Xiong,Jun Tan
In this study, bamboo fiber/high-density polyethylene (HDPE) composites were prepared, and the effects of nano-TiO 2 on their thermal properties and crystallization behavior were investigated via thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results show that the addition of nano-TiO 2 improved the thermal stability and had a dual function in the crystallization behavior of the composites. On one hand, it functioned as a nucleating agent. The addition of 2 wt % nano-TiO 2 promoted the crystallization, which caused the increase of the crystallization rate and crystallinity degree, as well as the micronization of the crystalline grain. On the other hand, intermolecular hydrogen bonds and covalent bonds were formed between nano-TiO 2 and the polymer matrix, which hindered the crystallization of the composites. When the content of nano-TiO 2 was continually increased, the inhibitory effect of the crystallization was gradually enhanced, which resulted in a decrease in the crystallization rate and crystallinity degree of the composites. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39846.
研究领域:
材料科学
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聚合物工程
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 5
·4090-4100
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IF 3.84
Jing Guo,Shaojun Yuan,Wei Jiang,Hairong Yue,Zhe Cui,Bin Liang
Surface-fluorinated TiO2 (F-TiO2) particles was synthesized by a simple fluorosilanization method to serve as a visible-light photocatalyst for rapid degradation of Rhodamine B (RhB) dyes. The fluroalkylsilane (FAS-17) was covalently immobilized on the TiO2 particles via robust Si–O bonds. The changes in surface properties of the F-TiO2 particles were characterized by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM) and zeta potential measurements. The optical property of the F-TiO2 particles was determined by UV-visible spectroscopy. Upon the fluorination modification, the zeta potential of TiO2 particles switched from positive to negative, whilst the optical property of bulk TiO2 particles remained almost unchanged. Photodegradation experimental results demonstrated that zwitterionic RhB dyes were more favorably adsorbed on F-TiO2 rather than on the Ti(IV) sites of the pristine TiO2, and that the photodegradation reaction of RhB on F-TiO2 proceeded much faster than that on the pristine TiO2. However, the adsorption and photodegradation rate of anionic methyl orange (MO) dyes did not show an obvious change on F-TiO2. These results suggested that the molecular structure of dyes played a key role in visible-light photodegradation reactions on F-TiO2 particles. Positive-charged diethylamine groups of RhB molecular structures were postulated to promote the adsorption of RhB dyes on the surface of F-TiO2 particles, thus leading to easy electron injection and induction of rapid photodegradation under visible-light illumination.
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
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Mu Liu,Xiaolei Bao,Fahao Ma,Minrui Wang,Liren Zheng,Zeyan Wang,Peng Wang,Yuanyuan Liu,Hefeng Cheng,Ying Dai,Yuchen Fan,Zhaoke Zheng,Baibiao Huang
Enhanced photocatalytic performance and excellent stability are usually regarded contradictory during photocatalytic reaction. In this study, supercycle ALD was employed to achieve superior performance and stability simultaneously for the system of TiO 2 @Cu during CO 2 reduction reaction, which was unattainable by post-deposition TiO 2 , a commonly-employed technique for enhancing stability. More oxygen vacancy, partially-covered Cu species as well as well-maintained charge separation capability of alternatively-deposited TiO 2 @(2Cu + 2TiO 2 ) × 25 could be the reason for enhanced activity and stability as suggested by a series of characterizations such as Single-particle TRPL and Single-particle PL. Experimental data also suggested unselective and mixed-layer deposition of TiO 2 and Cu loaded in the mode of alternative-deposition. The method proved in our study could be applicable in synthesizing other ALD-prepared catalysts with enhanced performance and stability, which will be a big step forward towards comprehensively utilizing the potential of ALD technique in the field of photocatalysis.
研究领域:
材料科学
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光催化
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DOI
高影响因子
PLASMA SCIENCE & TECHNOLOGY
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2021
·Vol. 23
·期 11
·115503
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IF 1.567
Xinghao LIU,Cheng CHENG,Zimu XU,Shuheng HU,Jie SHEN,Yan LAN,Paul K CHU
Tetracycline (TC) is an antibiotic mainly used in livestock production and respiratory infection. Traditional methods are not effective in removing TC from solution. In this study, TC was degraded by gas–liquid plasma in the presence of rGO-TiO2 in solution. The rGO-TiO2 was prepared by modified hummers and hydrothermal method. The electrical and optical properties of the gas–liquid discharge plasma were studied and the produced long-lived reactive species were analyzed by spectrophotometer. The degradation efficiency of TC was improved by 41.4% after plasma treatment for 12 min in presence of 30 mg l−1 rGO-TiO2 compared to that with plasma alone. The degradation efficiency increased with increasing discharge power, but as the initial concentration was increased from 20 to 80 mg l−1, the degradation efficiency of TC decreased. The initial pH had no significant effect on the degradation of TC. The intermediate products were determined by UV–vis spectrophotometry and ESI (+)–MS, and the degradation mechanism was analyzed. The reactive species, including O3, ·OH, and H2O2, etc., produced in the plasma/catalyst system attracted electron-rich functional groups (amino group, aromatic ring, and double bond). Therefore, the gas–liquid plasma/catalyst system could be an effective and promising method for pharmaceutical wastewater treatment in future.
研究领域:
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
APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Qi Zhao,Ye Yuan,Luyan Zhang,Liang Qiao,Cheng Ding,Kangshun Wang,Hongpeng Li,Jun Ma,Panpan Wang,Tianming Chen,Feihong Wang
Nonmetal doping is widely used in the modification of titanium dioxides (TiO 2 ) for photocatalytic applications. As a typical two-dimensional layered nanomaterial, the excellent physical and chemical properties of MXene materials have been the focus of current research. In this study, carbon and fluorine co-doped MXene derived TiO 2 nanosheets (labelled as C-F-TiO 2 ) were successfully synthesized and used as catalysts for degrading 2,4,6-trichlorophenol (2,4,6-TCP) under UV light irradiation. The C-F-TiO 2 with ultrathin nanosheet structure enhanced light absorption range and decreased the bandgaps. The degradation efficiency of 2,4,6-TCP by C-F-TiO 2 was over 99 % in 90 min, and the degradation rate was more than twice that of commercial TiO 2 . The degradation rate still remained about 90 % in 90 min after five cycles. The results of quenching experiments and electron spin resonance (ESR) illustrated that more reactive oxygen species (ROS) were generated in the C-F-TiO 2 /UV system, which was 1.5 times that of commercial pure TiO 2 , and • O 2 – was the dominant ROS for 2,4,6-TCP degradation. This study provided insight to utilize physicochemical characteristics of MXene to synthesize non-metal co-doped TiO 2 nanosheet as a catalyst, exhibiting excellent reactivity in the potential application for organic pollutant degradation.
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
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 34
·82560-82574
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IF 5.8
Li Yuyang,Sun Jian,Chen Yihua,Ma Hang,Zhu Jiaxin,Chen Zhiqiang,Meng Liao,Liu Tongzhou
TiO 2 is a promising photocatalyst used in practical environmental remediation. TiO 2 photocatalysts are usually implemented in two forms: suspended powder and immobilized thin films. A simple technique for fabricating TiO 2 thin film photocatalyst was developed in this work. The fabricated TiO 2 thin film photocatalyst featured a homogeneous nanowire layer grown in situ on the parent Ti plate. The optimized fabrication protocol was to soak the ultrasonically cleaned and acid-washed Ti plate in 30% H 2 O 2 solution containing 3.2 mM melamine and 0.29 M HNO 3 at 80 °C for 72 h and then anneal at 450 °C for 1 h. TiO 2 nanowires with uniform diameters were homogeneously arrayed on the Ti plate surface. The thickness of the TiO 2 nanowire array layer was 1.5 μm. The pore properties of the TiO 2 thin film were close to those of P25. The band gap of the fabricated photocatalyst was 3.14 eV. The photocatalytic activity of the fabricated photocatalyst toward 10 mg/L RhB and 1 mg/L CBZ demonstrated greater than 60% degradation under 2 h UVC irradiation. The RhB and CBZ degradation efficiencies remained at a good level after 5 consecutive cycles. Mechanical wearing, such as 2 min sonication, will not lead to significant suppression of the photocatalytic activity. Photocatalytic RhB and CBZ degradation using the fabricated photocatalyst favored an acidic > alkaline > neutral environment. The presence of Cl − slightly suppressed the photocatalytic degradation kinetics. However, RhB and CBZ photocatalytic degradation kinetics were promoted in the copresence of SO 4 2− or NO 3 − .
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
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Chengjiu Zhao,Xuezheng Guo,Yanqiao Ding,Chengyao Liang,Bingsheng Du,Wen Niu,Weijie Qu,Yijie Shi,Shuren Cong,Gang Meng,Yong He
Complex gas environments and the demand for room temperature detection will provide challenges for chemo-resistive-type gas sensors in a variety of applications. In this work, 2D/0D SnSe 2 /TiO 2 composite is used as a sensing material, displaying good sensitivity and specificity to ppb-level NO 2 at ambient temperature (25 °C). The response value and time of the SnSe 2 /TiO 2 sensor are 207 % and 139s when exposed to 100 ppb NO 2 , as opposed to 62 % and 183s for the pristine SnSe 2 sensor. The composite sensor also offers great long-term stability for NO 2 and good gas selectivity. Notably, the SnSe 2 /TiO 2 sensor's mixed gases (NO 2 +H 2 S) measurement is done to examine its NO 2 detection capacity in the presence of interfering gas. The constructed composite sensor can accurately detect NO 2 even if the concentration of the reductive interfering H 2 S is 66.7 times higher than that of the oxidative target NO 2 . The effective usage of SnSe 2 modified by TiO 2 for low-concentration, room-temperature NO 2 detection in a complex gas environment is shown by the composite sensor's pleasing gas detection results.
研究领域:
材料科学
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环境科学
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传感器技术
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 8
·6675-6685
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IF 3.277
Xuehua Yin,Pengtao Sheng,Fenfen Zhong,VanManh Nguyen,Qingyun Cai,Craig Grimes
We describe the synthesis and application of a three-dimensional (3D) CdS quantum dot/ZnIn2S4 nanosheet/TiO2 nanotube array (CdS/ZnIn2S4/TiO2) heterostructured material architecture. TiO2 nanotube arrays (TiO2 NTAs) are used as the synthetic template, subsequently sensitized using hydrothermal and successive ion layer adsorption and reaction (SILAR) techniques. The described synthesis approach offers a powerful technique in the design of 3D heterostructure systems. Under AM1.5G illumination, the 3D CdS/ZnIn2S4/TiO2 samples generate a photocurrent of approximately 4.3 mA cm−2, with a photoconversion efficiency of 2%. Samples are tested for their ability to photocatalytically degrade target agents; it is noteworthy that after 90 min illumination 100% of 2,4-dichlorophenoxyacetic acid (2,4-D) is removed.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Tingting Hao,Shen Wang,Hongbo Xu,Xiang Zhang,Shlomo Magdassi,Lei Pan,Ying Song,Yao Li,Jiupeng Zhao
The application of flexible indium tin oxide (ITO)-free electrochromic devices (FCDs) has always been a research hotspot in flexible electronics. Recently, a silver nanowire (AgNW)-based transparent conductive film has raised great interest as an ITO-free substrate for FCDs. However, several challenges, such as the weak binding of AgNWs to the substrate, high junction resistance, and oxidation of AgNWs, remain. In this paper, a novel method for surface modification of AgNWs with N-aminoethyl-γ-aminopropyltrimethoxysilane [Si(NH2)] solution is proposed to enhance the bonding with the flexible substrates and the active materials, thereby inhibiting the delamination of AgNWs from the substrate and reducing the high junction resistance between nanowires. The TiO2/AgNW–Si(NH2)/poly(ethylene terephthalate) (PET) films show outstanding mechanical properties, of which the resistance remains almost unchanged after mechanical bending of 5000 cycles (ΔR/R0 ≈ 3.6%) and repeated peeling off cycles with 3M tape 100 times (ΔR/R0 ≈ 6.0%). In addition, we found that the oxygen-containing groups on the TiO2/AgNW–Si(NH2)/PET surface form hydrogen bonds with the TiO2 sol, resulting in tight contact between the TiO2 sol and the AgNWs, which prevents the AgNWs from oxidation. As a result, the TiO2/AgNW–Si(NH2)/PET film exhibited long-time aging (ΔR/R0 ≈ 4.9% in the air for 100 days) stability. A FCD was constructed with the TiO2/AgNW–Si(NH2)/PET film, which showed excellent electrochromic performance (94% retention) after 5000 bending cycles, indicating high stability and mechanical flexibility. These results present a promising solution to the transparent conductive films for flexible energy devices.
研究领域:
材料科学
·
柔性电子技术
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 5
·1942-1952
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IF 3.288
Qiong Sun,Kaijing Li,Songhao Wu,Bing Han,Lina Sui,Lifeng Dong
A simple hydrothermal post-treatment has been developed to construct a TiO2 photocatalyst with a desirable anatase phase, porous structure, large surface area, small particle size and hydrophilic surface. When aggregated nanoparticles are treated under a high temperature and pressure, the crystal structure of TiO2 is first deeply destroyed and then reconstructed. The dispersity can then be greatly improved and a typical mesoporous structure is simultaneously produced, accompanied with an increase in the specific surface area, average pore size, total pore volume and the production of oxygen vacancies. The structural changes have positive effects on the photocatalytic degradation of dye molecules. For example, the kinetic constant (0.085 min−1) can be increased by 10 times as compared with that for the untreated ones (0.0085 min−1). Other parameters including temperature, time, solvent, calcination treatment and type of TiO2 are also explored to optimize the treatment. In addition, electrochemical tests prove that the hydrothermal post-treatment for TiO2 results in an accelerated O2 reduction reaction and improved photo-induced charge transfer process. From radical quenching experiments, superoxide radicals (O2−˙) are proven to be the major oxidative species for both post-treated and untreated TiO2, but the production of hydroxyl radicals (˙OH) is dramatically promoted by the post-treatment, which is a key factor for the acceleration of the photocatalytic reaction.
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
危险品化学品经营许可证（带存储）