NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 7
·4811-4817
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IF 3.201
Weiwei Chen,Shan Yu,Yunqian Zhong,Xiang-Bing Fan,Li-Zhu Wu,Ying Zhou
Quantum dot (QD)/TiO2 composites are widely used materials in the field of photocatalysis. However, the influence of different exposed facets of TiO2 in composites on photocatalytic hydrogen evolution is rarely reported. In this work, CdSe QD–TiO2 composites with dominant {001} or {101} faceted anatase were synthesized and specifically characterized using X-ray powder diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Photocatalytic hydrogen evolution tests reveal that {001}-TiO2/CdSe QDs exhibit a 213.1- and 9.0-fold increase in photocatalytic activity compared to {001}-TiO2 and CdSe QDs, respectively. Notably, the photocatalytic activity of {001}-TiO2/CdSe QDs is 2.2 times higher than that of {101}-TiO2/CdSe QDs. Based on the results from UV-Vis diffuse reflectance spectroscopy, Brunauer–Emmett–Teller surface area testing, Mott–Schottky testing and steady-state and time-resolved emission spectroscopy, the main reason for enhanced photocatalytic activity is the faster electron transfer from CdSe QDs to {001}-TiO2 compared with to {101}-TiO2. This research on tailored facets in QD/TiO2 composites provides primary insights for the design of effective photocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Xiaoxin Lv,Zixiao Deng,Menglian Wang,Jiujun Deng
Transition-metal carbides, carbonitrides , and nitrides (MXene) as an emerging two-dimensional semiconductor has open an ideal pathway for fabricating various TiO 2 -based functional materials . In this work, we demonstrate a simple and one-step heat treatment for the fabrication of Ti 3 C 2 MXene-derived carbon-doped TiO 2 /Fe 2 O 3 composite for superior lithium-ion batteries (LIBs). As an anode, the as-fabricated composite delivers an excellent lithium-ion storage of 538 mA h/g at a current density of 0.1 A/g and superior rate performance of 152.6 mA h/g at a higher current density of 5 A/g, which is 6 times higher than that of C-doped TiO 2 electrode. In addition, a remarkable cyclic stability with 88.46 % capacity retention is also obtained for the composite anode at a current density of 1 A/g after 1000 cycles. Based on various characterizations, the greatly enhanced electrochemical performance can be attributed to the synergistic effects of carbon doping, layered structures of TiO 2 , and the anchoring of Fe 2 O 3 nanoparticles , which effectively promote the charge transport kinetics. This study will broaden the Ti 3 C 2 MXene application in LIBs and meanwhile provide an alternative method for synthesizing more efficient anode materials .
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Liming Ling,Ying Bai,Zhaohua Wang,Qiao Ni,Guanghai Chen,Zhiming Zhou,Chuan Wu
Sodium alginate (SA) is investigated as the aqueous binder to fabricate high-performance, low-cost, environmentally friendly, and durable TiO2 anodes in sodium-ion batteries (SIBs) for the first time. Compared to the conventional polyvinylidene difluoride (PVDF) binder, electrodes using SA as the binder exhibit significant promotion of electrochemical performances. The initial Coulombic efficiency is as high as 62% at 0.1 C. A remarkable capacity of 180 mAh g–1 is achieved with no decay after 500 cycles at 1 C. Even at 10 C (3.4 A g–1), it remains 82 mAh g–1 after 3600 cycles with approximate 100% Coulombic efficiency. TiO2 electrodes with SA binder display less electrolyte decomposition, fewer side reactions, high electrochemistry reaction activity, effective suppression of polarization, and good electrode morphology, which is ascribed to the rich carboxylic groups, high Young’s modulus, and good electrochemical stability of SA binder.
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Journal of Materials Chemistry B
·
2018
·Vol. 7
·期 2
·210-223
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IF 4.776
Madiha Saeed,M. Zubair Iqbal,Wenzhi Ren,Yuanzhi Xia,Waheed S. Khan,Aiguo Wu
The development of a simplified theranostic system with high-efficiency for multifunctional imaging-guided photodynamic therapy/photothermal therapy (PDT/PTT) is a great challenge. Therefore, a versatile fabrication strategy was introduced to design new Fe3O4-black TiO2 nanocomposites (Fe–Ti NCs). The Fe–Ti NCs exhibit an intense broad light absorption, high photothermal conversion efficiency, inherited phototherapy, and favorable magnetic resonance imaging (MRI) properties. The in vitro results demonstrate synergistic PTT and PDT capability of Fe–Ti NCs under 808 nm irradiation at low concentration and power density. Fe–Ti NCs also show superior phototherapy performance (PTT/PDT) under 671 nm laser irradiation. The confocal microscopy analysis demonstrates reactive oxygen species (ROS)-mediated synergistic phototherapy. Hematological and histological analysis confirms no evident toxicity of Fe–Ti NCs. The in vivo photoinduced tumor ablation capability of Fe–Ti NCs was assessed and monitored, and a rapid increase in temperature (60 ± 2 °C) after being exposed to 808 nm laser at 0.7 W cm−2 for 5 min was observed. Then, the same change in temperature is observed under 671 nm laser at 0.5 W cm−2. Thus, in vitro and in vivo dual-wavelength laser tumor ablation ability of Fe–Ti NCs verified excellent synergistic phototherapy efficacy against tumors. Moreover, Fe–Ti NCs exhibit superparamagnetic behavior, high magnetization value (48 emu g−1), good r2 relaxivity value (38.2 mM−1 s−1), and excellent T2 imaging capability to monitor therapeutic performance.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 12
·12237-12246
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IF 2.914
Yang Mi,Shi Xianyang
Biosynthesized nanocomposites are attracting growing interests because they are environmentally friendly. Ag 2 S nanoparticles (Ag 2 S NPs) are deposited in situ on the surfaces of TiO 2 nanotubes (TNTs) via Shewanella oneidensis MR-1 to form Ag 2 S/TNT nanocomposites. The prepared Ag 2 S/TNTs nanocomposites are characterized using high-resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and energy-dispersive X-ray spectroscopy. The results show that Ag 2 S NPs smaller than 8 nm are successfully synthesized and fabricated on the TNT surfaces with relatively uniform distribution. The catalytic performance of the Ag 2 S/TNT nanocomposites is evaluated for catalytic reduction in the presence of NaBH 4 and the photocatalytic degradation of 4-nitrophenol (4-NP) under visible light. The Ag 2 S/TNT nanocomposites show excellent catalytic activity and good stability in the 4-NP reduction process. The 4-NP degradation ratio reaches 98.3% in 50 min, and 87% conversion was achieved after eight cycles. The Ag 2 S/TNT nanocomposites also exhibit excellent photocatalytic activity for 4-NP at a rate of 0.69 h −1 , and the complete degradation of 4-NP was observed within 5 h. Therefore, this study offers an environmentally friendly approach to synthesize nanocomposites for practical applications.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 22
·13661-13670
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IF 3.945
Si-Yuan Yu,Ying Liu,Hai-Tao Ren,Zhao-Yu Liu,Xu Han
Photooxidation of As(III) by TiO2 is a complicated process in which the oxidation mechanisms are always controversial. In this study, the enhanced photooxidation rates of As(III) with increasing pH values from 8.0 to 11.0 indicate the high photocatalytic reactivity of TiO2 under alkaline conditions. Moreover, As(III) improves the production of H2O2, indicating H-abstraction from As(III) (soluble or adsorbed) for H2O2 production. Although O2˙−, h+, ˙OH and –OOH are always regarded as the reactive oxygen species in the UV-TiO2 system, the superoxo and peroxo species formed on the surface of TiO2 also contribute to As(III) oxidation. The As(III)–O–Ti(IV) surface complexes formed on TiO2, as well as the decreased bandgaps of TiO2 with increasing concentrations of As(III) indicate that the ligand-to-metal charge transfer (LMCT) pathway also contributes to the oxidation of As(III) under alkaline conditions. Electrochemical analyses further reveal that As(III) enhances the electron density on the surface of TiO2, thereby improving the catalytic reactivity of TiO2. We therefore suggest that H-abstraction from As(III) or H2O to the formed superoxo and peroxo species results in the formation of H2O2, accompanied by the oxidation of As(III). This enriches our knowledge on the oxidation of As(III), as well as other contaminants rich in –OH groups during the photocatalytic oxidation processes.
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Current Nanoscience
·
2019
·Vol. 15
·期 2
·188-196
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IF 1.586
Xu Chengpeng,Ye Shengying,Cui Xiaolei,Zhang Quan,Liang Yan
Background: Improper storage and raw materials make peanut oil susceptible to Aflatoxin B1 (AFB1). The semiconductor TiO2 photocatalysis technology is an effective technology which is widely used in sewage treatment, environmental protection and so on. Moreover, the photocatalytic efficiency
can be improved by doping I. Method: The experiment is divided into two parts. In the first part, supported TiO2 thin film (STF) was prepared on the quartz glass tube (QGT) by the sol-gel and calcination method and the supported iodine doped supported TiO2 thin film (I-STF) was synthesized
using potassium iodate solution. In the second part, the photocatalytic degradation of AFB1 was performed in a self-made photocatalytic reactor. The AFB1 was detected by ELISA kit. Results: The photocatalytic degradation of AFB1 has been proven to follow pseudo first-order reaction kinetics
well (R2 > 0.95). The maximum degradation rate of 81.96%, which was reached at the optimum iodine concentration of 0.1mol/L, was 11.38% higher than that with undoped STF. Conclusion: The doping of iodine reduces the band-gap of TiO2, thereby increasing the photocatalytic response range.
The proportion of Ti4+ in I-STF has decreased, which means that Ti4+ are replaced by I. The I-STF prepared at iodine concentration of 0.1mol/L has good photocatalytic properties.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wei Song,Hanqing Zhao,Jianqi Ye,Mengmeng Kang,Siyu Miao,Zhong Li
Ti–O–C channels for ultrafast sodium storage were constructed in N/S-co-doped TiO2–C nanofibers, which deliver a high rate performance of 181.9 mAh g–1 at 5 A g–1 after 3000 cycles. The existence of Ti–O–C bonds at the interface of TiO2–C phases was revealed by synchrotron radiation X-ray absorption spectra. Based on this, first-principles calculations further verified the low energy barrier for Na+ insertion/extraction in the Ti–O–C channels formed by the intimately integrated graphite layer with TiO2 near the surface. In addition, surface defects induced by heteroatoms accelerate the Na+ mass transfer through the pathway from the carbon surface to the Ti–O–C channel.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Jiejing Kong,Zebao Rui,Hongbing Ji
Construction of versatile multijunctions with visible light response, effective charges transport and separation, suitable band positions, and good stability is highly expected for the photocatalytic VOCs degradation. Herein, one-dimensional titania nanotube supported SrTiO3 heterostructure (STO/TN) was developed by a hydrothermal process and then simultaneously sensitized with carbon nitride polymer (CN) and doped with nitrogen (CN-STO/TN) for photocatalytic mineralization of toluene. CN-STO/TN simultaneously exhibits the following advantages: (1) the nanotube structure enhances light-harvesting, enables effective charges transport and separation, retains sufficient energy of the charges, facilitates the pollutant species transport and reactants enrichment by the confinement effect; (2) synergistic effect of CN sensitization and N-doping extends the light response to the visible light region; (3) multichannel charges separation and transport among the multijunctions promote the photogenerated carriers separation. These beneficial factors lead to the remarkably higher visible light photocatalytic performance of CN-STO/TN in comparison with the component photocatalysts, 27 times that of TN, 13.5 times that of STO, and 4.9 times that of CN, respectively. These results demonstrate that the combination of morphology tailoring and energy band alignment manipulation is important in designing effective heterojunctions for photocatalytic applications.
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CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Chunhai Jiang,Shangbiao Liu,Qinghuang Lian,Jing Zhao,Weiqiang Ding,Zhiyang Yu,Renzhong Huang,Zhimin Zou
Nitrogen-doped carbon-coated Li 4 Ti 5 O 12 -TiO 2 (LTO-TO) hybrid microspheres were prepared by heat treating the dry mixture of urea and chemically lithiated dandelion-like TiO 2 microspheres in a stainless steel autoclave at 550 °C for 5 h. The hybrid materials were tested as anode of Li-ion batteries. As compared to the pristine sample, the N-doped carbon-coated LTO-TO microspheres exhibited higher specific capacity at both low and high current rates. Discharge capacities of 184 and 123 mAh g −1 were obtained at 0.2 C and 20 C, respectively. Moreover, the LTO-TO/C electrode showed excellent cycle performance, with a discharge capacity of 121.3 mAh g −1 remained after 300 cycles at 5 C, corresponding to an average capacity degradation rate of 0.073% per cycle. These high specific capacity, excellent rate capability and cycle performance demonstrated the high potentiality of the N-doped carbon-coated LTO-TO microspheres as anode material of both energy storage-type and power-type Li-ion batteries.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Ruonan Guo,Xinhui Xia,Xinyi Zhang,Bo Li,Huixuan Zhang,Xiuwen Cheng,Mingzheng Xie,Qingfeng Cheng
This work shows results of our investigation on Ag 3 PO 4 /TiO 2 NTAs photoelectrode photodegradation properties to diclofenac with visible light illumination. The composite photoelectrode has been synthesized by ultrasound-precipitation strategy and characterized through scanning electrons microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). In addition, photoelectrochemical and visible photocatalytic activity properties of as-prepared samples were investigated to prove the fact. Compared with pure TiO 2 NTAs, Ag 3 PO 4 /TiO 2 NTAs photoelectrode possesses the enhancement of light absorbance in the visible region and a lower recombination rate of photogenerated electron–hole pairs, so that it performed a better visible light photocatalytic property. Additionally, prepared Ag 3 PO 4 /TiO 2 NTAs photoelectrode has well recyclability. On the basis of electrochemical, fluorescence spectra and photoluminescence, the photocatalytic performance enhancement mechanism for Ag 3 PO 4 /TiO 2 NTAs was put forward.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xianbo Sun,Weiyu He,Xiaodi Hao,Haodong Ji,Wen Liu,Zhengqing Cai
A novel solar active AgBr/BiOBr/TiO 2 catalyst was synthesized by a facile coprecipitation method for solar-driven water remediation . The synthesized material composed of flower-like TiO 2 nanoparticles loaded on BiOBr nanosheets and with homogeneous surface distributed Ag/AgBr nanoparticles. The internal electric field between BiOBr/TiO 2 heterojunction greatly facilitated the charge carrier migration; the introduction of narrow band gap semiconductors (AgBr and BiOBr) promoted the visible light adsorption; and the Ag/AgBr nanoparticles acted as photosensitizer to further improve the light utilization. The new material showed 7.6- and 4.0-times activity of pure TiO 2 and BiOBr under solar light, and the contribution of reactive species on anthracene degradation followed the order of h + > O 2 • − > •OH. The degradation mechanism and pathway were proposed based on intermediates analysis and DFT calculation. The QSAR analysis revealed that the environmental risks of contaminants were greatly reduced during the photocatalysis process but some intermediates were still toxic. The high photocatalytic activity, stability and adaptability all indicated that this new material owns great application potential for cost-effective photocatalytic remediation of persistent organic contaminants under solar light.
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