JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Songyu Yang,Kailin Wang,Qiao Chen,Yan Wu
S-scheme heterostructure photocatalysts can achieve highly efficient solar energy utilization. Here, single-atom Ni species were deposited onto TiO 2 /g-C 3 N 4 (TCN) composite photocatalyst with an S-scheme heterojunction for highly efficient photocatalytic water splitting to produce hydrogen. Under solar irradiation, it realized the hydrogen production activity of 134 µmol g –1 h –1 , about 5 times higher than the TCN without atomic Ni. In-situ Kelvin probe force microscopy characterization and the density functional calculation certify that by forming the S-scheme heterojunction, the photo-excited electrons from the TiO 2 combine with the photogenerated holes at the coupled g-C 3 N 4 driven by a built-in electric field. More importantly, the single-atom Ni species stabilized the photogenerated electrons from the g-C 3 N 4 could effectively enhance the charge separation between the holes on the valence band of TiO 2 and electrons at the conduction band of g-C 3 N 4 . Meanwhile, the Ni atoms act as the surface catalytic centers for the water reduction reaction, which greatly improves the reactivity of the photocatalyst. The present work provides a new approach for developing noble metal-free heterojunctions for high-efficiency photocatalysis.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Youxu Yu,Zhipu Wu,Jinwang Li,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Liang An,Rong Chen,Qiang Liao
Mesoporous TiO 2 films are promising in photocatalysis and photoelectrochemistry for energy and environment applications, because of its high specific surface area and regular mesopore structure. However, the performances of mesoporous TiO 2 films are still limited by low catalyst loading due to the damage during the preparation process. In this study, a multi-step evaporation-induced self-assembly method is proposed to develop a mesoporous TiO 2 photoanode with high catalyst loading. The prepared mesoporous TiO 2 photoanodes possess not only high catalyst loading without damage but also large specific surface area, which provides more active sites. Moreover, regular mesopore structure is remained to benefit mass transport. Because of these merits, the mesoporous TiO 2 photoanode prepared by the multi-step evaporation-induced self-assembly method exhibits superior performance than does conventional nanoparticles-packed TiO 2 photoanode. The superiority of the mesoporous TiO 2 photoanode prepared by this multi-step evaporation-induced self-assembly method is also demonstrated by incorporating it into a photocatalytic fuel cell. The short circuit current density and maximum power density increase by 90.9% and 25.0%, respectively. The present work provides a new way to prepare high-performance mesoporous TiO 2 films for various photocatalytic and photoelectrochemical applications.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Ziyu Zhao,Meixuan Wu,Dandan Zhou,Quan Chen,Hao Li,Di Lang,Bo Pan,Baoshan Xing
Environmentally persistent free radicals (EFPRs) have recently attracted a great deal of research attention because of their significant toxicity and ubiquitous occurrence in the environment. The information is still very limited on how to estimate the intensity of EPFRs under ambient circumstances. This study is designed to specifically compare EPFRs generation during catechol degradation in dark and UV light irradiation. CuO and TiO 2 were selected as model metal oxides to coat on silica at 1% CuO has a large electron exchange capacity, which may mediate catechol degradation in dark, while TiO 2 possesses strong photocatalytic property and could accelerate catechol degradation under UV light. Under UV light irradiation, EPFRs were generated very quickly and reached the maximum value in 4 d, which was related to the photocatalytic property of the particle. However, these EPFRs dissipated quickly in 14 d. On the contrary, the intensities of EPFRs generated in dark were 2 times higher, and stabled for over 2 months. Therefore, the environmental impacts of EPFRs in dark may be widespread and long-lasting, which should be monitored more carefully. It should be noted that for CuO-coated silica, a significant amount of EPFRs (20% of the maximum) survived the UV-light irradiation and stabled during the experimental period (45 d). Stronger EPFRs were associated with more abundant dimer structures, suggesting the dimer structures were related to EPFRs formation during catechol degradation. Monitoring the generation of dimer structures in the degradation of organic chemicals may provide useful information to estimate EPFRs generation and risks.
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Analytical Methods
·
2021
·Vol. 13
·期 15
·1803-1809
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IF 2.896
Mingqing Li,Li Li,Boya Li,Liying Zhai,Baohui Wang
The design and construction of a photoelectrochemical (PEC) sensor with excellent photoelectric properties and good photoelectrocatalysis activity is significant for the effective detection of analytes. In this paper, based on a two-step anodic oxidation method and successive ionic layer adsorption (SILAR) method, a TiO2 nanotube array (TNT) photoelectrochemical sensor modified with BiOBr nanosheets was constructed and applied for the detection of H2O2 for the first time. The photocurrent of the photoelectrochemical sensor increases with the increase of the H2O2 concentration under the irradiation of an 8 W UV lamp. Excellent linearity was obtained in the concentration range from 10 nM to 100 μM with a low detection limit of 5 nM (S/N = 3). This excellent photoelectrochemical performance is due to the formation of a p–n heterojunction between BiOBr and TiO2 nanotube arrays, which provides efficient separation of charge carriers and accelerates electron transport. Moreover, it is applied to detect H2O2 in milk samples and it showed a good recovery result ranging from 95.73% to 105.65%, which provides a promising new strategy for the detection of H2O2.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Xule Pei,Tong Zhang,Jingyi Zhong,Zaihao Chen,Chuanjia Jiang,Wei Chen
Oxygen-deficient substoichiometric titanium oxides, or “titanium suboxides,” are produced incidentally from coal combustion and are environmentally abundant. Additionally, titanium suboxide nanomaterials are promising new materials with likely future environmental release. How these materials may affect contaminant fate differently than stoichiometric TiO 2 (nano)materials is largely unknown. Here, we show that Ti 2 O 3 (selected as a model titanium suboxide) exhibits significantly greater efficiency in enhancing the hydrolysis of 1,1,2,2-tetrachloroethane (TeCA), a common groundwater contaminant, than the stoichiometric anatase and rutile TiO 2 . At environmentally relevant pH (6.5–7.5), the surface area-normalized pseudo-first-order hydrolysis rate constant in the presence of Ti 2 O 3 is approximately an order of magnitude higher than those associated with TiO 2 . The superior catalytic efficiency of Ti 2 O 3 can be attributed to both its higher surface hydrophobicity , which renders higher adsorption affinity for TeCA, and its higher concentration of Lewis acid sites (mainly the Ti 3+ and the five-coordinated Ti 4+ ). Particularly, the deprotonated hydroxyl groups attached to Ti 3+ (a weaker Lewis acid than Ti 4+ ) exhibit higher basicity and thus, are more effective in catalyzing the base-promoted hydrolysis reaction. The findings call for further understanding of the environmental implications of titanium suboxide (nano)materials, which may not be readily predictable based on the knowledge acquired for TiO 2 .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Chen Wang,Yinglin Wang,Pengfei Cheng,Luping Xu,Fan Dang,Tianliang Wang,Zhaohui Lei
A highly sensitive and selective acetone gas sensor has been fabricated successfully by designing n-n heterojunction consisting of TiO 2 nanorods and α -Fe 2 O 3 branches. The structure and morphology of the TiO 2 / α -Fe 2 O 3 nanocomposites were examined via X-ray diffraction and scanning electron microscopy, respectively. TiO 2 nanorod (with the diameter about 42 nm) arrays were in-situ generated on the surface of Al 2 O 3 ceramic tubes by a simple hydrothermal process. In addition, α -Fe 2 O 3 branches grew on TiO 2 stems successfully in the second hydrothermal process. These nanorod branches had a relatively uniform length, which could be tunable by changing the concentration of iron precursor. The gas sensing properties of the pristine and α -Fe 2 O 3 branches-decorated TiO 2 nanorods sensors with regard to acetone gas were investigated. The results indicated that the sensor based on TiO 2 / α -Fe 2 O 3 heterostructures measured at 225 °C had a higher response of 21.9 toward 100 ppm of acetone gas which was about 9 times higher than pristine TiO 2 nanorods sensor. The dominant mechanism for enhanced sensing properties were discussed in detail with the semiconductor depletion layer model and TiO 2 / α -Fe 2 O 3 n–n heterojunction theory.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Enmin Zong,Chen Wang,Jiayao Yang,Hangxuan Zhu,Shengtao Jiang,Xiaohuan Liu,Pingan Song
The design of environmentally benign bio-adsorbents for the removal of phosphate from aqueous medium was an economic and effective way for controlling eutrophication . Herein, we prepared three kinds of TiO 2 /cellulose (CE-Ti) nanocomposites by a facile hydrolysis-precipitation method, and used them as antibacterial bio-adsorbents for the removal of phosphate from aqueous medium. Multiple techniques including Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and thermogravimetric analysis (TGA) were employed to characterize the nanostructure and characteristics of the prepared CE-Ti nanocomposite. The adsorption capacity of the CE-Ti was 19.57 mg P g −1 according to the Langmuir model, which was 6 times higher than that of CE. Importantly, the bacterial inhibition zone of the CE-Ti was 2.88 mm (that of CE was 0 mm), indicating that CE-Ti had good antibacterial activity that could reduce the attachment of the microorganism to the surface of CE-Ti, which was suitable for long-term phosphate removal. Moreover, the CE-Ti had good adsorption selectivity and anti-interference capability, according to interfering ions and ion strength experiments. Furthermore, Ti 4+ leakage tests suggested that CE-Ti was highly stable under acidic, neutral and alkali conditions. These results indicated that the CE-Ti nanocomposite could be utilized as a promising antibacterial bio-adsorbent for effective phosphate removal from aqueous medium.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·10951-10962
·
IF 2.478
Zhang Yakang,Liang Xuan,Jiang Mengting,Liang Qian,Xu Song,Yao Chao,Zhou Man,Li Zhongyu
Based on the three-dimensional ordered macroporous titanium dioxide (3DOM-TiO 2 ), a series of gold-embedded 3DOM-TiO 2 ( n Au@3DOM-TiO 2 ) with controlled Au loading amount ( n = 0.24, 1.2, 2.4, 4.8, 12, and 24 wt%) was successfully fabricated via in-situ pyrolysis for the first time. Compared with the surface-modified Au/3DOM-TiO 2 by traditional impregnation–reduction route, this body-doped Au@3DOM-TiO 2 structure exhibited smaller particle size and better dispersive property which are important for photocatalysis. Therefore, the photocatalytic activities of n Au@3DOM-TiO 2 have been tested and the optimized photocatalyst of 4.8Au@3DOM-TiO 2 was identified. A possible mechanism of Au@3DOM-TiO 2 for the enhanced photoactivity was well discussed. The present work demonstrated a unique “gold-embedded” interface with potential advantages of highly dispersed, anti-aggregation, easy recovery, and enhanced catalytic performance, and that this approach could provide an ideal platform for the further design of noble metal-doped semiconductors.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xuhong Jiang,Mengmeng Sun,Zhuoyuan Chen,Jiangping Jing,Guiying Lu,Chang Feng
Boosting the photoinduced cathodic protection (CP) for metals in NaCl solution is crucial for achieving the application of photoelectrochemical conversion in marine corrosion protection. An environmentally friendly three-dimensional ZnIn 2 S 4 /TiO 2 nanoflowerbush (NFB) photoelectrode was constructed with sufficient interfacial incorporation based on the ultrafine branched TiO 2 nanobush substrate via a facile in situ hydrothermal method . This ZnIn 2 S 4 /TiO 2 NFB nanoheterojunction composite behaves excellent photoinduced CP performance for metallic materials. This is owing to the optimized construction of photoelectrode with relatively negative band potential, wide solar spectrum response, effective generation and collection of photoinduced electrons. The morphology, distribution and performance of ZnIn 2 S 4 vary with different substrates. The pure ZnIn 2 S 4 powder is nanoflower sphere composed of a lot of thin petals; when ZnIn 2 S 4 grow onto the FTO glass, the ZnIn 2 S 4 petals are distributed vertically on the two-dimensional structure; when ZnIn 2 S 4 grow on the three-dimensional ultrafine branched TiO 2 nanobush substrate, a ZnIn 2 S 4 /TiO 2 NFB architecture with ultrafine TiO 2 branchlet cores are formed. This ZnIn 2 S 4 /TiO 2 NFB photoelectrode can achieve efficient photoinduced CP performance for pure copper and low alloy steels with different negative self-corrosion potentials, such as Cu (−0.18 V), E40 (−0.45 V), Q345 (−0.55 V) and Q235 carbon steel (−0.65 V) under simulated sunlight irradiation in NaCl solution without additional hole scavengers, and the photoinduced CP current densities reach as high as 170, 72, 63 and 44 μA cm −2 , respectively. The high-efficiency photoinduced CP performance is closely related to the band structure gradient matching between the TiO 2 and ZnIn 2 S 4 , prompting both the widened absorption of solar spectrum and high-efficiency transfer of the photogenerated electron–hole pairs. Importantly, the negative band potential of ZnIn 2 S 4 endues a lower surface work function which benefits the electron transport to the under-protected metallic materials to achieve photoinduced CP. This photoelectrode exhibits huge photoinduced CP application potential in marine environments.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5024-5033
·
IF 6.569
Menglong Yao,Hongkang Wang,Ruifeng Qian,Tianhao Yao,Jian-Wen Shi,Yonghong Cheng
We report a facile solvothermal synthesis of hollow TiO2 nanospheres using phenolic resin nanospheres as templates under magnetic stirring conditions, followed by annealing. The as-prepared hollow TiO2 nanospheres show an inner diameter of ∼400 nm, a shell thickness of ∼45 nm, and a high specific surface area of 33.8 m2 g−1. When used as anode materials for lithium-ion batteries and sodium-ion batteries, the hollow TiO2 demonstrates excellent cycling stability and rate capability, delivering high lithium storage capacities of 178/138 mA h g−1 at 0.2/1.0 A g−1 after 200/1000 cycles, and high sodium storage capacities of 213/177/115 mA h g−1 after 200/1000/4000 cycles at 0.2/1.0/5.0 A g−1. The outstanding electrochemical performance is related to the robust structural stability of the hollow nanostructured TiO2, which can be expected as a promising anode material for next generation alkali metal ion batteries.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 2
·339-349
·
IF 5.693
Lin Chunling,Liu Boyang,Pu Liuyue,Sun Yan,Xue Yanli,Chang Mulan,Li Xin,Lu Xingyu,Chen Rong,Zhang Jiaoxia
As a highly active photocatalyst, g-C 3 N 4 /TiO 2 heterojunction nanocomposites were in situ synthesized by hydro-thermal method and calcination using melamine as precursors. The morphology and chemical structure of the prepared photocatalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), SEM, UV-vis, and photoluminescence analysis (PLA). At last, the photocatalytic activities of g-C 3 N 4 /TiO 2 nanocomposites to remove fluoride under simulated visible light were evaluated. Results showed that the fluoride removal rate of the prepared g-C 3 N 4 /TiO 2 was about three times than pure g-C 3 N 4 due to the rapid charge transfer and the efficient separation of photogenerated electron-hole pairs in heterojunctions between g-C 3 N 4 and TiO 2 . Graphical abstract Heterojunction g-C 3 N 4/ TiO 2 display the excellent fluoride removal rate due to the rapid charge transfer and efficient separation of electron-hole pairs.
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Polymer-Plastics Technology and Materials
·
2021
·
IF 2.371
Yan Zhang,Zaifeng Shi,Tianyi Sun,Dashuai Zhang,Xiaopeng Zhang,Xiaoxue Lin,Chen Li,Lili Wang,Junjun Song,Qiang Lin
A novel photodegradable Methylene Blue (MB)/TiO2/PVC film was prepared. The physical and mechanical properties, hydrophilicity, and the thermal stability of the film before irradiation were characterized. The photodegradability test was performed by using gel permeation chromatography (GPC), infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), and scanning electron microscopy (SEM). Compared with TiO2/PVC, MB/PVC, and PVC, the MB/TiO2/PVC film showed the higher photodegradability. The weight loss rates of TiO2/PVC, MB/PVC, and MB/TiO2/PVC films after irradiation for 30 h were 8.94%, 15.84%, and 27.55%, respectively, while that of PVC was only 2.12%. The decline rates of Mw and Mn of MB/TiO2/PVC (MB 2 wt%, TiO2 1 wt%) were 35.68% and 65.38%, respectively. Due to the excellent degradability and usability of the MB/TiO2/PVC film, the photocatalytic technology is a feasible and effective way to solve “white pollution”.
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