SURFACE & COATINGS TECHNOLOGY
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2021
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IF 4.158
Rongrong Chen,Yanqi Xu,Xiangli Xie,Cunjun Li,Wenfeng Zhu,Qiankun Xiang,Guangyao Li,Di Wu,Xuemei Li,Linjiang Wang
The corrosion of 304 stainless steel (304SS) is a major global issue in the context of ships and marine engineering constructions. The photocathode anticorrosion system, composed of semiconductor material in the form of photoanode and 304SS in the form of cathode, is an effective method to solve 304SS corrosion of large components. Owing to the rapidly photoinduced charge-transfer at the semiconductor interface that supplies photogenerated electrons to the electrically connected 304SS and shifts the coupled potential to much more negative values, constructing a photoanode heterostructure material promotes charge separation and thus improves the photocathodic anticorrosion of 304SS. Herein, we fabricated TiO 2 nanotubes/nickel‑gallium layered double hydroxide (TiO 2 /NiGa-LDH) heterostructure material by the electrochemical anodization and hydrothermal method for highly-efficient photocathodic anticorrosion of 304SS. Owing to the modulated band structure and enhanced photogenerated carriers separation and transfer, TiO 2 /NiGa-LDH heterostructure material gave rise to largely reduced open circuit potential (OCP, −690 mV), which facilitated the transfer of electrons from the TiO 2 /NiGa-LDH heterostructure material to the 304SS to improve the photocathodic anticorrosion of 304SS, along with good stability after the OCP test for 72 h. This work provides a strategy for exploring LDH-based photoanodes materials toward highly-efficient photocathodic anticorrosion of 304SS.
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高影响因子
Nanotoxicology
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2021
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IF 5.913
Chao Wang,Jiansheng Zhu,Xing Gong,Yinyin Liang,Shuyu Xu,Yongquan Yu,Liu Yang,Jiayi Xu,Shou-Lin Wang
This study attempts to explore the potential impact of titanium dioxide nanoparticles (n-TiO2) on bioconcentration and reproductive impairments of male zebrafish in the presence of 2,2′,4,4′-tetrabromodiphenyl ether (BDE47), the congener of PBDEs predominant in environment and most abundant in biosamples. n-TiO2 nanoparticles strongly adsorbed BDE47 to form BDE47/TiO2 complex, which was taken up into the testes of zebrafish, and increased the tissue burdens of both BDE47 and n-TiO2. Correspondingly, no observed toxic dose of n-TiO2 (100 μg/L) was found to aggravate the abnormal histological morphology of the testes and the decrease in egg production, gonadosomatic index, sexual hormone levels and related gene expression in zebrafish in the presence of BDE47 at 5 or 50 μg/L. In addition, n-TiO2 exacerbated the destruction resulting from the ultrastructural disassembly of intercellular connectivity of germ cells in zebrafish and the decrease in transepithelial electrical resistance in TM4 cells induced by BDE47. Furthermore, n-TiO2 enhanced BDE47 to initially activate p-JNK MAPK signaling pathway and subsequently triggered the downregulation of junction proteins (i.e., ZO-1, Connexin-43 and N-cadherin), leading to impaired cell-cell junctions in vivo and in vitro. Our results demonstrated that n-TiO2 should act as a carrier to facilitate the accumulation of BDE47 in zebrafish testes and result in a synergistic effect on BDE47-induced adverse reproductive outcomes via disruption of intercellular connectivity of zebrafish testes. This study is beneficial in providing a scientific basis for improving the health risk assessment of environmental pollutants, particularly those that coexist with nanoparticle contamination in realistic environments.
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
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IF 3.927
Chentao Hou,Huayang Liu,Mohammad Fahim Bakhtari
In order to solve the problem of tetracycline hydrochloride (TCH) wastewater pollution, a photocatalyst for the efficient utilization of sunlight was proposed. In this work, a new method for the synthesis of three-dimensional flower-like Ag/TiO 2 -{001}/HTiOF 3 photocatalyst was applied, where surface oxygen vacancies can induce Ag nanoparticles (NPs) to disperse on the surface of the photocatalyst, which avoids the aggregation of Ag NPs into large particles. The appropriate mesoporous structure of the photocatalyst makes TCH have a stronger affinity on its surface, which is more conducive to the subsequent photodegradation . Furthermore, the surface plasmon resonance (SPR) of Ag NPs extends the response region of photocatalyst to visible light, and the heterojunction formed with TiO 2 /HTiOF 3 further stimulates the electrons in the oxygen vacancy region and inhibits the recombination of carriers. 10-Ag/TiO 2 /HTiOF 3 showed the best degradation activity (96%) for TCH when the ratio of Ag and TiO 2 -{001}/HTiOF 3 was 10%. In addition, the Ag/TiO 2 -{001}/HTiOF 3 photocatalyst has excellent photocatalytic activity , structural stability and sedimentation performance. The prepared catalyst has practical application prospect.
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高影响因子
ENERGY
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2021
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IF 7.147
T.X. Xu,X.K. Tian,A.A. Khosa,J. Yan,Q. Ye,C.Y. Zhao
The CaCO 3 /CaO reversible reaction pair is a promising thermochemical energy storage (TCES) technology for concentrating solar power (CSP) plants. However, the reaction performance and cyclic stability of this reaction pair is compromised because of sintering. In this study, TiO 2 -doped in CaCO 3 /CaO TCES system are systematically investigated by synchronous thermal analyzer (STA). The reaction kinetics of decarbonation process with and without TiO 2 doping are compared in N 2 and CO 2 atmospheres. Furthermore, the performance of CaCO 3 /CaO TCES system is analyzed in a fixed-bed reactor for future application. It is found that doping TiO 2 can improve the anti-sintering ability and cyclic stability of CaCO 3 , and the optimal doping ratio is 2.5 mol %, whose energy storage density is 1256.68 kJ/kg sample at first and improved by 2.26 times after 30 cycles. Moreover, doping TiO 2 decreases the activation energy and initial decarbonation temperature in CO 2 atmospheres. In exothermic experiments of fixed-bed reactor, the maximum exothermic temperature difference is 309.83 °C at 550 °C, and the highest absolute temperature reaches 848.7 °C at 750 °C. TiO 2 dopant promotes the decarbonation at lower temperature, and obtains a higher overall conversion (0.506) at 850 °C. Overall, CaCO 3 with TiO 2 dopant is of great significance for future industrial and commercial applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Mingjia Zhang,Fanyu Meng,Shule Zhang,Yiqing Zeng,Qin Zhong
The peroxone reaction between O 3 and H 2 O 2 over TiO 2 exhibits bright prospects for low-temperature flue gas denitration, which effectively overcomes the limitations of traditional peroxone reaction and remains advanced poison resistant ability. In this study, sulfur-doped TiO 2 was successfully adopted to improve the catalytic performance under low consumption of O 3 and H 2 O 2 , making this technology take a pivotal step towards practical application. Compared with TiO 2 /H 2 O 2 /O 3 system (68% NO conversion), the NO conversion could reach up to 85% in S-doped TiO 2 /H 2 O 2 /O 3 system under test condition (GHSV = 1.2 × 10 5 h −1 , H 2 O 2 /NO = 1.2, and O 3 /NO = 0.5). Characterizations and density functional theory calculations revealed that sulfur-doping modified the local structure of the catalyst, which enables a more effective combination between Ti 5c and hydroperoxyl, thus facilitating the reaction. Besides, the introduction of sulfur could increase the adsorption capacity of NO x and enhance the Lewis acidity of the catalyst, thus improving the NO conversion performance. The stability and applicability of the process were systematically tested from the following aspects: varied gas composition, H 2 O 2 consumption, pH value, and SO 2 /CO concentration. Results revealed that the S-doped TiO 2 /H 2 O 2 /O 3 system exhibited good stability and poison resistant ability, the potential for practical applications.
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高影响因子
Journal of Nanostructure in Chemistry
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2021
·Vol. 12
·期 6
·1075-1087
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IF 6.391
Wang Junlei,Wang Kuan,He Zhen-Hong,Li Song-Song,Zhang Rong-Rong,Guo Pengfei,Wang Weitao,Yang Yang,Liu Zhao-Tie
A solvothermal route was developed to synthesize hierarchical TiO 2 nanoflowers with tunable morphology, macroporous and mesoporous structure, and larger surface areas by varying the ratio of N , N -dimethylformamide to isopropyl alcohol without using surfactant and template. Morphology and microstructure, textural, crystalline, optical and photoelectric properties were characterized to investigate thoroughly the correlation of features and photoactivity of catalysts. The photoactivity was evaluated for the degradation of phenol through analyzing the phenolic compounds. The catalysts exhibited significantly high photocatalytic activity with the degradation rate of phenol of 95%, and the decrease of total organic carbon (TOC) was 82 ± 3% under ultraviolet radiation (UV) for 180 min at room temperature. Meanwhile, the excellent cyclic stability and regenerability were obtained during five cycles and continued illumination. The enhanced photocatalytic activity probably was attributed to larger surface areas, hierarchical porous structure, effective generation and separation of the charge carriers, and outstanding light-harvesting ability.
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高影响因子
APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Meiling Zhang,Mingwu Zhao,Rongrong Chen,Jingyuan Liu,Qi Liu,Jing Yu,Rumin Li,Peili Liu,Jun Wang
It has been broadly studied to ensure the protection of magnesium alloy by superhydrophobic surface. In this work, the layered TiO 2 was prepared in response to the AZ31 Mg alloy by hydrothermal method and loaded wrinkled silicon dioxide (KCC-1) on the layer by electrostatic self-assembly to build a pod-like structure. After modification by stearic acid, the surface shows superhydrophobicity. The morphology, structure and composition of the surface were characterized by scanning electron microscope (SEM), the X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), respectively. The anticorrosive effect of the superhydrophobic surface was investigated by detecting the electrochemical impedance spectroscopy and polarization curves in 3.5 wt% NaCl solution for a week. Superhydrophobic surfaces also exhibited chemical stability, physical stability and ultraviolet light tolerance. In addition, the TiO 2 containing in the film had a certain photocatalytic performance on decomposition of organic contaminants. Combining the self-cleaning property, the surface showed excellent adaptability to the outdoor environment.
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高影响因子
CERAMICS INTERNATIONAL
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2019
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IF 3.45
Guiliang Zhu,Sheng Feng,Jianying Chao,Wei Zheng,Cong Shao
A simple one-pot method was employed to synthesize C-dots modified TiO 2 nanosheets (NS)/UiO-66-NH 2 for enhancing photocatalytic activity. Anatase TiO 2 NS and UiO-66-NH 2 were closely combined and C-dots were well modified on their surfaces. The photocatalytic activities of catalysts were assessed through photodegrading ketoprofen (10 mg/L) under visible light. C-dots/TiO 2 NS/UiO-66-NH 2 degraded 90% of ketoprofen in 80 min, and owned the higher kinetic rate than TiO 2 NS (24 times) or TiO 2 NS/UiO-66-NH 2 (2.1 times). The results indicated that C-dots/TiO 2 NS/UiO-66-NH 2 exhibited the most superb visible-light photocatalytic activity. Besides, C-dots/TiO 2 NS/UiO-66-NH 2 showed good stability and reusability in four runs of degrading ketoprofen. The improved photocatalytic performance was caused by the heterostructure of TiO 2 NS and UiO-66-NH 2 and photoelectrical performance of C-dots, effectively absorbing visible light and promoting photoelectrons transfer.
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高影响因子
Nanoscale
·
2019
·Vol. 12
·期 3
·1801-1810
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IF 6.97
Yang Gao,Luyun Zhang,Yanhong Liu,Sijia Sun,Zhibin Yin,Lili Zhang,Aiguo Li,Guangming Lu,Aiguo Wu,Leyong Zeng
Black titanium dioxide (TiO2) nanoparticles have attracted great attention due to their application in photothermal therapy (PTT). However, single-mode phototherapy has the risk of recurrence, and the high-dose laser usually imposed to improve the PTT performance can bring a potential threat to security. Here, polydopamine (PDA)-coated black TiO2 (b-P25@PDA) nanoparticles with a core–shell structure were synthesized for enhanced PTT; then, synergistic phototherapy nanoprobes (b-P25@PDA-Ce6 (Mn)) were constructed by coupling chlorin e6 (Ce6) and chelating Mn2+ for simultaneous photodynamic therapy (PDT)/PTT and magnetic resonance (MR) imaging, in which a low-dose laser was used and imaging-guided phototherapy with high efficiency and high safety was achieved. The prepared nanoprobes showed high photothermal conversion efficiency (32.12%), high reactive oxygen generation and excellent MR imaging. In the 4T1 tumor-bearing nude mouse model, the tumors completely disappeared under the combination of PDT/PTT with a low-dose laser but were only partially inhibited by single PDT and single PTT. The current work developed a multifunctional black TiO2-based nanoprobe for enhanced synergistic PDT/PTT and MR imaging, which will be important for the safe and efficient visualized theranostics of cancers.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Yiying Yue,Xianhui Wang,Qinglin Wu,Jingquan Han,Jianchun Jiang
A novel photocatalytic hydrogel was prepared by loading TiO 2 nanoparticles (TiO 2 NPs) onto the surface of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized chitin nanofibers (TOCNs), which were further incorporated into the polyacrylamide (PAM) matrix. The resultant hydrogel exhibited a macro-porous structure with a low density (~1.45 g/cm 3 ) and high water content (~80%). The well-dispersed TiO 2 NPs not only acted as a crosslinking agent for bridging the three-dimensional porous network structure, but also endowed the hydrogel with good catalytic activity. After the introduction of TiO 2 accounting for 10 wt% of the hydrogel mass, the hydrogels showed compressive strength of 1.46 MPa at 70% strain, tensile stress of 316 kPa, tensile strain of 310%, toughness of 47.25 kJ/m 3 and fatigue resistance. Compared with neat TOCN-PAM hydrogel, the uniaxial compressive and tensile strengths of the TiO 2 -TOCN-PAM10 hydrogel increased 6.35-fold and 3.70-fold, respectively. Furthermore, the removal of methyl orange (MO) was attributed to the synergistic effect of the adsorption and photocatalytic degradation of the hydrogels. The hydrogels adsorbed up to 8.5% of MO after 150 min of adsorption and a photocatalytic degradation rate of 97.3% achieved after 90 min of UV irradiation at pH = 2. Especially, the TiO 2 -TOCN-PAM10 hydrogel exhibited excellent recycling performance: its MO removal efficiency was around 96% even after 10 reuse cycles. The as-prepared hydrogels, with characteristics of excellent stretchability, photocatalytic activity and recyclability, are expected to be used in alleviating organic pollutants in practical wastewater treatments.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2019
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IF 3.834
Yaqi Hou,Shengyan Pu,Qingqing Shi,Sandip Mandal,Hui Ma,Shengyang Xue,Guojun Cai,Yingchen Bai
New approaches and practices to improve photocatalytic efficiency of materials for remediation of organic and inorganic pollutant has become a top priority. We have developed a graphene-oxide based ternary composite Ag/TiO 2 /rGO as a green catalyst, and the photocatalytic oxidation and reduction efficiency of the catalyst was thoroughly evaluated for Cr(VI) and tetracycline (TC) remediation in water as potential contaminants. The results suggested that the electronic coupleing system exhibits excellent photocatalytic activity, mainly due to affecting light absorption and higher e − / h + separation efficiency. The photocatalytic activity of the silver-deposited graphene-supported silver and titanium dioxide was 4.3 and 2.5 times for Cr (VI) and TC remediation, respectively. Furthermore, the service life of the photocatalyst was also evaluated within five recycling studies, indicating that the efficiency of the obtained photocatalyst was maintained above 80%. Electron paramagnetic resonance spectroscopy and the addition of free radical scavengers confirmed that e − act as reducing agents and may be the key (O 2 ·− ) to the degradation process. The photocatalytic mechanism was proposed based on the studies obtained. Green catalysts based on graphene-based ternary composites developed in this work can provide effective and economic remediation at higher scale and offer practical application of photo catalysis technology.
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高影响因子
Materials Chemistry Frontiers
·
2019
·Vol. 3
·期 12
·2659-2667
·
IF 0
Yue Zhao,Qingsen Zeng,Tanglue Feng,Chunlei Xia,Chongming Liu,Fan Yang,Kai Zhang,Bai Yang
TiO2 photonic crystals (PCs) are widely interesting in photocatalysis due to their slow photon effect for efficient light harvesting. However, their performance is limited by the narrow absorption range and fast charge recombination. In this work, an efficient strategy is developed to enhance the light harvesting and charge lifetime through fabricating TiO2 PC/carbonized polymer dot (CPD) heterostructures. The CPDs with a band gap of 2.08 eV are used to broaden the light absorption range. The energy level of CPDs matches well with TiO2 PCs, forming a type-II heterojunction. The staggered energy levels of CPD/TiO2 PC heterostructures are helpful for charge separation and thus suppressed charge recombination, which is demonstrated by the transient photovoltage (TPV) measurements. Therefore, the CPD/TiO2 PC heterostructures exhibit obviously better photocatalytic performance than individual TiO2 PCs. The combination of CPDs and inorganic semiconductors provides a variety of possibilities for the further development of high-efficiency photocatalysts.
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