APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Bojing Sun,Wei Zhou,Haoze Li,Liping Ren,Panzhe Qiao,Fang Xiao,Lei Wang,Baojiang Jiang,Honggang Fu
The solar-light-harvesting and separation of nanostructured photocatalysts in slurry systems are key issues in fields of photocatalysis. Herein, magnetic Fe 2 O 3 /mesoporous black TiO 2 hollow sphere heterojunctions (M-Fe 2 O 3 /b-TiO 2 ) are fabricated through wet-impregnation and surface hydrogenation strategy, which show wide-spectrum response and magnetic separation. The decreased specific surfaces, pore sizes and pore volumes from ∼80 to 67 m 2 g −1 , ∼12 to 10.3 nm, and ∼0.20 to 0.16 cm 3 g −1 , respectively, all confirm the efficient loading of magnetic Fe 2 O 3 . The M-Fe 2 O 3 /b-TiO 2 with narrow bandgap of ∼2.41 eV extends the photoresponse from UV to near infrared region and exhibits excellent solar-driven photocatalytic degradation performance and long-term stability for complete mineralization methyl orange and high-toxic herbicide metribuzin. The photocatalytic reaction apparent rate constant k for metribuzin is ∼ 9 times higher than that of pristine TiO 2 under AM 1.5 irradiation. Especially for single-wavelength of 950 nm, the degradation ratio is up to 4%. The enhancement is attributed to Ti 3+ and magnetic Fe 2 O 3 with narrow bandgap facilitating solar-light-harvesting, the hollow structure benefiting mass transport, and the heterojunctions favoring the spatial separation of photogenerated electron-hole pairs. The magnetic separation is conducive to recycle of photocatalysts, which favors practical applications in environment.
研究领域:
材料科学
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光催化
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环境科学
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纳米技术
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能源材料
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DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 6
·2634
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IF 4.6
Xiaoshu Qu,Lili Zhou,Zefeng Liu,Zeyu Wang,Jilong Wang,Xiaoyang Yu,Hua Jin,Yanyan Yang
The key challenge in the practical application of electrochromic energy storage devices (EESDs) is the fabrication of high-performance electrode materials. Herein, we deposited K7[La(H2O)x(α2-P2W17O61)] (P2W17La) onto TiO2nanowires (NW) to construct an NW–P2W17La nanocomposite using a layer-by-layer self-assembly method. In contrast to the pure P2W17La films, the nanocomposite exhibits enhanced electrochromic and electrochemical performance owing to the 3D sea-cucumber-like microstructure. An EESD using the NW–P2W17La film as the cathode exhibited outstanding electrochromic and energy storage properties, with high optical modulation (48.6% at 605 nm), high switching speeds (tcoloring= 15 s, tbleaching= 4 s), and high area capacitance (5.72 mF cm−2at 0.15 mA cm−2). The device can reversibly switch between transparent and dark blue during the charge/discharge process, indicating that electrochromic contrast can be used as a quantitative indicator of the energy storage status.Keywords:electrochromism;energy storage;polyoxometalate;nanostructures;EESD
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PubMed
高影响因子
RSC Advances
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2023
·Vol. 13
·期 9
·5957-5969
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IF 3.9
Dai Yongheng,Yuan Huayu,Li Jiang,Su Qi,Yi Qianwen,Zhang Yuntao
The construction of direct Z-scheme heterojunctions with high photocatalytic degradation ability is important for wastewater treatment, but there are still many unsolved challenges. In this article, we report the fabrication of a Z-scheme P–TiO2/g-C3N4 (CNPT-X) heterostructure by the calcination method. Under simulated sunlight, CNPT-X composites are found to show excellent degradation performance against sulfonamide antibiotics sulfadiazine (SD), sulfamethazine (SM2), sulfamonomethoxine (SMM), and sulfamethoxazole (SMZ). CNPT-3 (400 mg L−1) can be used to degrade four sulfa antibiotics within 90 min, with a degradation rate as high as 99%, which is higher than that for P–TiO2 and g-C3N4 alone. The internal electron transfer paths and mechanisms for the composites are revealed by ESR radical detection experiments, XPS energy spectrum shifts, valence band positions and active material quenching experiments. Furthermore, the degradation products are analyzed by GC-MS, and four possible degradation pathways for sulfonamide pollutants are proposed. This photocatalyst provides new insights into the fundamental aspects of the photocatalytic degradation mechanism for composite pollutants, as well as new ideas for practical environmental applications.
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Nature Communications
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2023
·Vol. 14
·期 1
·1-12
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IF 16.6
Ba Ziyu,Luo Hongyun,Guan Juan,Luo Jun,Gao Jiajia,Wu Sujun,Ritchie Robert O.
High-performance, fast-growing natural materials with sustainable and functional features currently arouse significant attention. Here, facile processing, involving delignification, in situ hydrothermal synthesis of TiO 2 and pressure densification, is employed to transform natural bamboo into a high-performance structural material. The resulting TiO 2 -decorated densified bamboo exhibits high flexural strength and elastic stiffness, with both properties more than double that of natural bamboo. Real-time acoustic emission reveals the key role of the TiO 2 nanoparticles in enhancing the flexural properties. The introduction of nanoscale TiO 2 is found to markedly increase the degree of oxidation and the formation of hydrogen bonds in bamboo materials, leading to extensive interfacial failure between the microfibers, a micro-fibrillation process that results in substantial energy consumption and high fracture resistance. This work furthers the strategy of the synthetic reinforcement of fast-growing natural materials, which could lead to the expanded applications of sustainable materials for high-performance structural applications.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Di Zhang,Hongli Hu,Ji-an Wei,Xin Xu,Lei Chen,Xiaohui Wu,Qianqian Yu,Bo-xing Zhang,LinGe Wang
Titanium dioxide (TiO 2 ) is well known for its photocatalytic and antibacterial properties which are widely used in organic pollutants treatment and antibacterial. However, the fast recombination of electron-hole pairs of TiO 2 and the wide bandgap energy during photocatalysis progress are prominently degrades its photocatalytic efficiency. In this study, we designed and investigated Zr-doped TiO 2 ceramic nanofibrous membranes with enhanced photocatalytic properties for dye scavenging and bacteria inactivation. A mixture solution of poly(acrylonitrile) (PAN) and preceramic polymers (Zr-doped polytitanoxane) was electrospun to fabricate Zr-doped TiO 2 ceramic nanofibrous membranes, which were then carbonized in argon at 600 °C and calcined in air at 400 °C. It was found that the morphologies, structures, and characteristics of ceramic nanofibrous membranes were significantly influenced by the composition and content of preceramic polymers. The doping of Zr element improved photocatalytic activity of ceramic nanofibrous membranes and achieved efficient antibacterial activity . This work demonstrates a new strategy for the fabrication and application of multifunctional TiO 2 composites by incorporating with ceramic nanofibrous membranes.
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高影响因子
FUEL
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2023
·
IF 7.4
Jiali Zhou,Ge Li,Hongfei Li,Ziran Ma,Shuang Liu,Xiaolong Tang
Sintering is among the most challenging obstacles preventing the development of platinum catalysts that highly effective for hydrocarbon combustion at low temperatures. To overcome this obstacle, a Pt@TiO 2 catalyst with platinum nanoparticles encapsulated by TiO x overlayers was synthesized in this article, via melamine-mediated calcinations at 800 °C in air. Being physically constrained (“protected”) and electronically buffered (“Pt x + /Pt 0 ↔ Ti 3+ /Ti 4+ ”) by the thermally stable TiO x , this catalyst preserved a large amount of reactive metallic Pt 0 sites, which therefore exhibited obviously higher activity for C 3 H 8 and C 3 H 6 combustion in comparison with conventional supported Pt/TiO 2 catalysts. Moreover, steam and SO 2 in the reaction atmospheres caused reversible influences on the catalytic performance of this sample, indicating the high practical potential of such a recipe for the design of platinum catalysts with superior activity and durability for hydrocarbon combustion.
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Catalysts
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2023
·Vol. 13
·期 4
·643
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IF 3.9
Minming Bao,Yuxi Liu,Jiguang Deng,Lin Jing,Zhiquan Hou,Zhiwei Wang,Lu Wei,Xiaohui Yu,Hongxing Dai
The development of efficient and stable catalysts is of great importance for the elimination of volatile organic pollutants (VOCs). In this work, AuPdxnanoparticles (NPs) were loaded on TiO2through the electrostatic adsorption approach to generate theyAuPdx/TiO2(i.e., 0.35AuPd0.46/TiO2, 0.34AuPd2.09/TiO2, and 0.37AuPd2.72/TiO2;xandyare Pd/Au molar ratio and AuPdxloading, respectively;x= 0.46–2.72; andy= 0.34–0.37 wt%) catalysts, and their catalytic activities for the oxidation of ethyl acetate were determined. The results showed that the 0.37AuPd2.72/TiO2sample exhibited the best activity (T50%= 217 °C andT90%= 239 °C at SV = 40,000 mL/(g h),Ea= 37 kJ/mol, specific reaction rate at 220 °C = 113.8 µmol/(gPds), and turnover frequency (TOFNoble metal) at 220 °C = 109.7 × 10−3s−1). The high catalytic performance of the 0.37AuPd2.72/TiO2sample was attributed to the good dispersion of AuPd2.72NPs, the strong redox ability, the large ethyl acetate adsorption capacity, and the strong interaction between AuPdxand TiO2. Acetaldehyde, ethanol, and acetic acid are the main intermediates in the oxidation of ethyl acetate, and the loading of AuPdxNPs effectively reduces the formation of the toxic by-product acetaldehyde. The oxidation of ethyl acetate over the 0.34AuPd2.09/TiO2sample might occur via the pathway of ethyl acetate → ethanol → acetic acid → acetate → CO2and H2O. We believe that the obtained results may provide a useful idea for the design of bimetallic catalysts under industrial conditions and for understanding the VOCs oxidation mechanisms.Keywords:supported Au–Pd nanocatalyst;ethyl acetate oxidation;strong electrostatic adsorption;sulfur dioxide resistance;reaction mechanism
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Nanomaterials
·
2023
·Vol. 13
·期 7
·1144
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IF 5.3
Jinbao Li,Sha Fan,Huijuan Xiu,Haiwei Wu,Shaoyan Huang,Simin Wang,Dingwen Yin,Zili Deng,Chuanyin Xiong
Silicon-based anode materials are considered one of the highly promising anode materials due to their high theoretical energy density; however, problems such as volume effects and solid electrolyte interface film (SEI) instability limit the practical applications. Herein, silicon nanoparticles (SiNPs) are used as the nucleus and anatase titanium dioxide (TiO2) is used as the buffer layer to form a core-shell structure to adapt to the volume change of the silicon-based material and improve the overall interfacial stability of the electrode. In addition, silver nanowires (AgNWs) doping makes it possible to form a conductive network structure to improve the conductivity of the material. We used the core-shell structure SiNPs@TiO2/AgNWs composite as an anode material for high-efficiency Li-ion batteries. Compared with the pure SiNPs electrode, the SiNPs@TiO2/AgNWs electrode exhibits excellent electrochemical performance with a first discharge specific capacity of 3524.2 mAh·g−1at a current density of 400 mA·g−1, which provides a new idea for the preparation of silicon-based anode materials for high-performance lithium-ion batteries.
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高影响因子
Journal of CO2 Utilization
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2023
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IF 7.7
Shibo Yuan,Peng Bai,Yi He,Jiafa Chen,Yicheng Zhao,Yongdan Li
Photocatalytic N-formylation of amines with CO 2 is a promising strategy to convert CO 2 into value-added chemicals sustainably. In this work, a black TiO 2 -supported Cu photocatalyst is prepared through a solvothermal method for the N-formylation of N-methylaniline with NaBH 4 as the reducing agent. Cu nanoparticles and oxygen vacancies are formed on the surface of the photocatalyst after reduction with H 2 , which decreases the band-gap energy and promotes the separation of photogenerated electrons and holes, thereby improving the photocatalytic activity remarkably. A 100 % conversion is achieved after 9 h radiation, and the yield of N -methylformanilide reaches 81 %. Both the amount of NaBH 4 and the pressure of CO 2 show important influences on the activity and selectivity of the photocatalytic process, and the carbon and hydrogen in the aldehyde group are from CO 2 and NaBH 4 , respectively. The photocatalyst also shows promising cycling durability.
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高影响因子
ENERGY
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2023
·
IF 9
Xirong Yue,Xu Ji,Haiyang Xu,Bianfeng Yang,Mengqi Wang,Yuan Yang
In this paper, GO-TiO 2 /PVDF composite ultrafiltration membranes were prepared for slightly polluted ground water treatment with high efficiency and low energy consumption. The TiO 2 nanoparticles solidly loaded on GO reduced the agglomeration between GO sheets, and the grafting of GO-TiO 2 nanocomposites by polyethylene glycol (PEG), partially grafted onto the surface of TiO 2 nanoparticles, prevented the agglomeration between TiO 2 nanoparticles. GO-TiO 2 was used as an additive to prepare GO-TiO 2 /PVDF composite ultrafiltration membrane by non-solvent induced precipitation phase separation method, and the fouling resistance and hydrophilicity of the membrane were improved. The structure and morphology of the composite ultrafiltration membranes were characterized using FTIR, SEM and contact angle testers, and the water flux and fouling resistance of the composite ultrafiltration membranes were evaluated using the ultrafiltration method, and investigate the effectiveness of the composite ultrafiltration membranes in treating slightly polluted ground water. The 0.05% GO-TiO 2 /PVDF composite ultrafiltration membrane has better hydrophilicity and fouling resistance, with a pure water flux of 280.3 L/(m 2 ·h), 2.1 times higher than that of the PVDF membrane. In an experiment using GO-TiO 2 /PVDF composite ultrafiltration membrane to filter campus lake water, the removal rates of COD , DOC and aromatic compounds (UV 254 ) were increased by 15.8%, 54.2% and 55.4% respectively compared to using PVDF membrane, and the GO-TiO 2 /PVDF composite ultrafiltration membrane has excellent filtration effect for slightly polluted ground water.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Yi Yang,Jingjing Liu,Miaoli Gu,Bei Cheng,Linxi Wang,Jiaguo Yu
Coupling photocatalytic H 2 O 2 evolution with simultaneous furfuryl alcohol oxidation can avoid the slow water oxidation reaction and fully utilize photogenerated carriers to produce valuable chemicals. Herein, a COF (denoted as BTTA) was synthesized by the Schiff-base condensation and in-situ grown on the surface of TiO 2 nanofibers. The resultant TiO 2 /BTTA composite has a large interface and a short carrier migration distance. Furthermore, the porous and ultrathin BTTA layers endow the composites abundant active sites and excellent light absorption ability. Remarkably, a H 2 O 2 -evolution rate of 740 μmol L −1 h −1 and a furoic alcohol conversion of 96 % are achieved. In-situ irradiated X-ray photoelectron spectroscopy and electron spin resonance confirm the S-scheme carrier transfer mechanism, which spatially separates photogenerated carriers with strong redox power. This work opens a new door to the rational design of S-scheme photocatalysts for economic and green photosynthesis of H 2 O 2 and organic compounds.
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MATERIALS CHEMISTRY AND PHYSICS
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2023
·
IF 4.6
Qiuhua Yuan,Yuan Yang,Wenshan Wu,Xiaoyi Dai,Junxi Zhong,Youliang Jian,Ruilong Li,Tao Wang,Hong Yu,Xianyou Xia
Titanium dioxide (TiO 2 ) is widely used as photocatalysts in the field of organic wastewater treatment in recent years.In this study, TiO 2 is combined with hydroxyapatite (HA) and reduced graphene oxide (RGO) to prepare a novel ternary composite material. And methylene blue(MB) was used as the target pollutant to evaluate the photocatalytic activity of TiO 2 /HA/RGO. The results show that the introduction of HA and RGO can effectively enhance the catalytic performance of TiO 2 . Under 120min of simulated sunlight, the composite showed excellent dye removal effect, the removal rate of MB can reach 99.8%, and its degradation rate is 2 times that of TiO 2 /HA and 7 times that of TiO 2 . The improvement of the photocatalytic activity of the ternary composite is mainly due to the synergistic effect between TiO 2 , HA and RGO. This work provides a new idea for the synthesis of practical photocatalysts.
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