JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2023
·Vol. 56
·期 43
·435503
·
IF 3.4
Ting Zhang,Xiaoyun Huo,Ling Wang,Fang Ma,Yafei Hou
Dielectric capacitors with satisfactory energy storage performances are highly demanded. Herein, x vol.% TO@FO@ethanediamine (EDA)-poly (vinylidene fluoride) (PVDF) nanocomposites combining the novel one-dimensional (1D) hybrid TiO2@Fe3O4@ethylenediamine (TO@FO@EDA NWs) as fillers and PVDF as matrix deliver the enhanced energy storage performances. Compared with the TO-, TO@EDA- and TO@FO- filled nanocomposites, TO@FO@EDA filled nanocomposites deliver the highest polarization, breakdown strength and energy storage performances because of the synergistic effects of 1D TO, conductive FO and EDA. As a result, the 2 vol.% TO@FO@EDA-PVDF nanocomposite shows the highest polarization difference (6.92 μC cm−3 at 435 kV mm−1), leading to an excellent discharged energy density (13.64 J cm−3), which is 192% higher than that of the pure PVDF (7.11 J cm−3). The primary results might provide a new solution to optimize the energy storage performances of polymer-based nanocomposites.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Guanghui Li,Changye Mang,Lang Xing,Pengxu Cao,Yongfeng Cai,Jun Luo,Hao Jiang
Methylene blue (MB) is extensively used in the textile industry; meanwhile, it is also one of carcinogenic and mutagenic pollutants. The removal of MB from wastewater by photocatalytic decomposition under visible light irradiation is a very important method. In this work, a photocatalyst of Mo-doped TiO 2 coated on fly ash cenosphere (CTAB-Mo-TiO 2 /FAC) was prepared by a sol-gel method and modified by hexadecyl trimethyl ammonium bromide (CTAB). Compared to TiO 2 /FAC and Mo-TiO 2 /FAC (without CTAB), it was featured by low bandgap and strong light absorption ability. More importantly, the light absorption range broadened from 200 to 400 nm to 200–800 nm, which could absorb visible light . Besides, after adding CTAB, the Mo 6+ could more easily dope into the TiO 2 lattice and cause crystal distortion, which exposed more oxygen vacancies . Oxygen vacancies could generate abundant reactive radicals to enhance the photocatalytic activity . At CTAB-Mo-TiO 2 /FAC dosage of 2 g/L, 99.75% of MB was removed in an initial MB concentration of 0.03 mmol/L with a pH of 7.0 under visible light irradiation of 60 min, whereas that of Mo-TiO 2 /FAC and TiO 2 /FAC was only 42 % and 24 %, respectively. The photodynamic parameter of CTAB-Mo-TiO 2 /FAC (0.066 min −1 ) is about 3 times of Mo-TiO 2 /FAC (0.023 min −1 ), 8.3 times of TiO 2 /FAC (0.008 min −1 ).
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JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
·
2020
·Vol. 53
·期 9
·526-532
·
IF 0.651
Lianzhong Shen,Guiying Xu,Beibei Han,Hui Ge,Shigekazu Kato,Youyuan Dai,Kun Wang,Fei Sun,Weimin Zhou
In this study, carbon black (CB) and carbon (coal-tar pitch-based spherical activated carbon (SAC)) were used to successfully fabricate composite-type SAC (CB/coal-tar-pitch-SAC), and its surface was coated with TiO2 to produce the composite material TiO2/CB/coal-tar-pitch-SAC. CB helps in decreasing the pore size of CB/coal-tar-pitch-SAC and increasing its specific surface area and total pore volume, which can be verified by the Brunauer–Emmett–Teller (BET) method. Practically, TiO2/CB/coal-tar-pitch-SAC can sterilize the bacteria present in the water. This study intensively verifies the high reusing sterilization capacity of TiO2/CB/coal-tar-pitch-SAC. The results indicate that TiO2/CB/coal-tar-pitch-SAC can effectively improve the water environment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Meixia Fan,Yan Wang,Nan Xue,Yanxia Zhao,Ziyang Wang,Miaomiao Wang,Yi Zhao,Baoyu Gao
The presence of TiO 2 nanoparticles (NPs) influences the efficiency of water and wastewater treatment because of the composite contaminants formed due to the interaction between TiO 2 NPs and Natural Organic Matter (NOM). In this study, the coagulation of TiO 2 NPs and NOM composite contaminants (TiO 2 NPs-NOM) was explored by comparing their fluorescence characteristics, flocs properties, and membrane fouling abilities in different aquatic media (i.e., humic acid synthetic water: WATER HA , surface water: WATER XQ ; and municipal wastewater: WATER MW ). Results showed that the TiO 2 NPs-NOM removal efficiency depended on the characteristics of NOM in various aquatic media. TiO 2 NPs improved the removal efficiency for fluorescent substances from WATER HA and WATER XQ when the solution pH was 5. However, this removal efficiency declined as the pH was increased to 9. In comparison, the removal efficiency for fluorescent substances from WATER MW increased as the TiO 2 NPs concentration was increased to 5 mg/L, and then decreased gradually as the TiO 2 concentration was increased to 20 mg/L. This is due to the competing adsorption and precipitation reactions between aromatic proteins and NPs. The different TiO 2 NPs-NOM in the tested water showed different flocs structures. The fractal dimensions of the flocs in WATER HA decreased with increasing TiO 2 NPs concentration until it exceeded 10 mg/L, while the fractal dimensions of WATER MW flocs increased with increasing TiO 2 NPs concentration. This was due to the formation of more loose flocs in the presence of aromatic proteins and soluble microbial byproducts . Total membrane resistance showed little change with increasing TiO 2 NPs concentration in the coagulation-ultrafiltration membrane process. The percentages of strongly attached external fouling resistance (Ref-s) and internal fouling resistance (R if ) increased with increasing TiO 2 NPs concentration.
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SOLAR ENERGY
·
2018
·
IF 4.374
Yanqi Lv,Yi Guo,Heng Zhang,Xingfu Zhou,Hongling Chen
In this study, commercial available inorganic p-semiconductor CuSCN and carbon was employed in replacing the expensive hole transport materials and noble metal electrode of the traditional perovskite solar cell, respectively. TiO 2 compact layer and the mesoporous layer were also replaced by TiO 2 nanorod arrays. The fully-air processed perovskite solar cells were easy to fabricate and demonstrated an enhanced efficiency and stability. The introduction of CuSCN improves the current density and the fill factor of the solar cell, thus leads to 29% increase in conversion efficiency. Intensity modulated photovoltage (IMVS) shows that the solar cell with CuSCN has a longer electron life time. Current attenuation curve shows that the current of the solar cell with CuSCN rises quicker and higher than that of the solar cell without CuSCN. The steady-state photoluminescence tests shows that the introduction of CuSCN layer enhances the separation of electrons and holes, thus reducing the recombination of electrons and holes. Electrochemical impedance spectroscopy (EIS) reveals that the solar cell with CuSCN has low transport resistance and high recombination resistance, thus leading to the slower electron recombination rates. In addition, study shows that the use of CuSCN and carbon displays high stability, and both kind of cells keep over 80% of the initial efficiency after 30 days without encapsulation. This method simplifies the perovskite solar cell fabrication process and opens a door toward the cheap, stable and printable solar cell.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Wenxin Yang,Dongxue Han,Zhonghui Sun,Zhishan Liang,ziqian He
Ascorbic acid (AA) is a very common and important antioxidant, widely present in various daily foods, and more importantly, it is an indispensable vitamin in the human body. In this study, a 980 nm near-infrared (NIR)-driven Ti₂O₃-TiO₂-based photoelectrochemical (PEC) sensor was developed for the selective and sensitive detection of AA. Upon 980 nm irradiation, a heterojunction is established between the tetravalent (Ti⁴⁺) and trivalent (Ti⁺) titanium oxides in the Ti₂O₃-TiO₂ photoactive semiconductor. This heterojunction enhances the separation of photogenerated electron-hole pairs and accelerates electron transport. Due to its low redox potential, AA can reduce Ti⁴⁺ to Ti3+, leading to a reversal in the direction of photogenerated electron flow within the semiconductor. The material changes from an n-type semiconductor to a p-type semiconductor, resulting in the phenomenon of photocurrent polarity reversal in PEC only in the presence of AA. At the same time, the sensor has a wide detection range of 1 - 302 μM for AA and the detection limit is 0.43 μM. All of these make it possible to use it for the detection of AA content in real rat cerebrospinal fluid and human plasma, with high recovery rates and low relative standard deviations. This approach holds great potential as an accurate and convenient method for medical detection of AA levels in the human body.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Cheng Rong,Xia Jin-cheng,Shen Liang-jie,Shen Zhi-peng,Shi Lei,Zheng Xiang,Zheng Jian-zhong
Photocatalytic disinfection is a promising technology with low cost and high efficiency. However, most of the current studies on photocatalytic disinfection ignore the widespread presence of natural organic matter (NOM) in water bodies, so the incomplete conclusions obtained may not be applicable. Herein, this paper systematically studied the influence of humic acid (HA), one of the most important components of NOM, on the photocatalytic inactivation of bacteriophage f2 with electrospinning Cu-TiO 2 nanofibers. We found that with the addition of HA, the light transmittance of the solution at 550 nm decreased from 94 to 60%, and the band gap of the photocatalyst was increased from 2.96 to 3.05 eV. Compared with reacting without HA, the degradation amount of RNA of f2 decreased by 88.7% after HA was added, and the RNA concentration increased from 1.95 to 4.38 ng·μL −1 after the reaction. Hence, we propose mechanisms of the effect of HA on photocatalytic disinfection: photo-shielding, passivation of photocatalysts, quenching of free radicals, and virus protection. Photo-shielding and photocatalyst passivation lead to the decrease of photocatalyst activity, and the reactive oxygen species (ROSs) (·OH, ·O 2 − , 1 O 2 , H 2 O 2 ) are further trapped by HA. The HA in water also can protect the shape of phage f2 and reduce the leakage of protein and the destruction of ribonucleic acid (RNA). This work provides an insight into the mechanisms for the influence of HA in photocatalytic disinfection process and a theoretical basis for its practical application.
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PubMed
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Kaihui Hua,Zhijing Wu,Weijie Chen,Yu Zheng,Xiuan Xi
Despite extensive research on TiO 2 -based photocatalysts, their poor visible-light response and low charge-separation efficiency still limit practical applications in wastewater treatment. While previous studies have explored individual strategies such as metal doping or defect engineering, few have systematically investigated their synergistic effects in TiO 2 porous ceramics. This study addresses these challenges by developing a dual-modification strategy combining ZnO doping and NaBH 4 reduction to enhance the photocatalytic performance of TiO 2 porous ceramics. ZnO doping promotes anatase phase stability and inhibits the anatase-to-rutile transition, while NaBH 4 reduction introduces abundant oxygen vacancies and Ti 3+ species, narrowing the band gap and extending light absorption into the visible range. As a result, the optimized ceramics achieve a methylene blue degradation efficiency of 90.07%, outperforming undoped (79.32%) and singly ZnO-doped (86.01%) counterparts. This synergistic enhancement is attributed to the tailored surface chemistry and electronic structure, verified through structural and optical characterizations. Compared with previous TiO 2 porous ceramic studies, this work provides a scalable and effective modification strategy, offering new insights for designing high-efficiency, recyclable photocatalysts for environmental remediation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Like Ouyang,Yan Zhang,Yuan Wang,Xinlong Wang,Shaojun Yuan
The coupled adsorption–photocatalytic oxidation process provides a great potential scenario to enhance the removal efficiency of arsenite contaminants by converting As(III) to As(V) and simultaneous adsorption. In this study, the boron-doped black TiO2/g-C3N4 nanocomposite is synthesized by combination of sol–gel and in situ decomposition-thermal polymerization methods as a photocatalyst for the photocatalytic oxidation and adsorption of As(III). Under dark conditions, the boron-doped samples (B-TiO2 and B-TiO2/g-C3N4) display an increase in the As(III) adsorption capacity by one order of magnitude up to circa 3.2 mg g–1 with an initial As(III) concentration of 2 mg L–1 at 298.15 K and pH 5. The adsorption kinetics of As(III) on B-TiO2/g-C3N4 conform to the pseudo-second-order kinetic model, revealing the chemical adsorption mechanism. Under visible light irradiation, the total arsenic removal capacity is substantially improved by 20% with a removal capacity of 3.9 mg g–1. The enhancement of arsenic adsorption is attributed to the chemical complexation and hydrogen bond, in which B–OH bonds play a dominant role. The photocatalytic oxidation mechanism of the as-synthesized B-TiO2/g-C3N4 is attributed to the synergism of superoxide radicals, hydroxyl radicals, and photogenerated holes.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 6
·4164-4169
·
IF 1.339
Du P. F.,Song L. X.,Xiong J.
Novel TiO2 nanoparticles/nanofibers (NPs/NFs) bilayered nano-composite photoanode film for dye-sensitized solar cells (DSSCs) was fabricated through the combination of spin-coating and electrospinning. The NPs and NFs layers have complementary roles. The underlaid spin-coated
NPs layer provides the photoanode film with higher specific surface area for dye adsorption and improved adhesion to conductive glass substrate. The overlaid electrospun NFs layer endows the photoanode film with better dye-loading and light-harvesting capabilities due to its porous meshwork
structure. And the NFs layer also offers larger pore volume, which can facilitate the electrolyte diffusion and the activity regeneration of dye sensitizers. As a result, the electron transport is accelerated while the charge recombination is suppressed. Ascribing to the synergic effect of
the NPs and NFs layers, the TiO2 NPs/NFs-based DSSCs achieve a conversion efficiency of 4.46%, which is nearly 14% higher than that of the pure TiO2 NPs-based ones.
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高影响因子
Molecular Catalysis
·
2017
·
IF 0
Peng Sun,Rui-tang Guo,Shu-ming Liu,Shu-xian Wang,Wei-guo Pan,Ming-yuan Li,Shuai-wei Liu,Jian Liu,Xiao Sun
CeSmOx mixed oxide catalysts supported on TiO 2 prepared by coprecipitation method were used for selective catalytic reduction of NOx with NH 3 . The results showed that the addition of Sm could effectively enhance the low-temperature SCR activity and SO 2 /H 2 O resistance of Ce/TiO 2 catalyst, and the appropriate mole ratio of Sm to Ce was 0.3. Characterization results indicated that the introduction of Sm could promote the formation of Ce 3+ and chemisorbed oxygen species on catalyst surface, which was favorable to the generation of NO 2 . Moreover, the doping of Sm could also promote the adsorption of NH 3 and NOx species on Ce/TiO 2 catalyst. The results of in situ DRIFT study revealed that the NH 3 -SCR reaction over CeSm/TiO 2 -0.3 catalyst was mainly controlled by the Langmuir−Hinshelwood mechanism in the low temperature range (<200 °C). Thereafter, the promoted NO oxidation and the enhanced NH 3 adsorption should play a major role for the excellent low-temperature SCR performance of CeSm/TiO 2 -0.3 catalyst.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Tao Li,Amal Abdelhaleem,Wei Chu,Shengyan Pu,Fei Qi,Jing Zou
The degradation of pyrimethanil (PYR) was investigated through the activation of oxone by the S-TiO 2 (ST) photocatalyst under visible LED irradiation. The catalyst characterization revealed that the sulfur doping mechanism was based on the cation (S 6+ ) substitution of Ti 4+ in TiO 2 lattice. The optimal molar ratio of S/Ti at 0.25 was proven efficient in the PYR degradation. Influences of various reaction parameters including ST loading, oxone dosage, PYR concentration, and initial solution pH were examined. SO 4 •- , • OH, 1 O 2 , O 2 •- , and h + were found to be the reactive species generated in the ST/Oxone/Vis LED process. Different natural water constituents exerted dissimilar effects because of the generation of additional reactive species or their radical scavenging capabilities. Moreover, the reusability test indicates the ST photocatalyst is reusable and stable. A series of degradation intermediates was detected via four major degradation pathways. Overall, the ST/Oxone/Vis LED process was demonstrated to be a promising approach for the removal of organic pollutants.
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