JOURNAL OF MOLECULAR STRUCTURE
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2025
·
IF 4.7
Minghao Lin,Gangan Wang,Junqi Li,Chaoyi Chen,Yuanpei Lan
Calcined kaolinite (CK)/TiO 2 composites were synthesized through hydrolysis precipitation of titanyl sulfate (TiOSO 4 ) and calcination. Under optimized hydrolysis conditions (pH 2.5, duration 2.0 h, temperature 90 °C, and mass ratio (TiO 2 /CK) = 1.0), a precipitation efficiency of 81.4 % was achieved. The phase composition remained consistent under varying hydrolysis conditions after significant TiO 2 formation. Furthermore, the oil absorption (mass ratio = 2.0) and hiding power (mass ratio = 1.4) of the composites were determined to be 38.8 g/100 g and 88.4 %, respectively. The composites exhibited high good chemical stability as a pigment, maintaining resistance to strong acid erosion, with only 4.0 % dissolution observed after a 15-day immersion in a pH 2.0 solution. H 2 TiO 3 underwent the dehydration and desulfurization more rapidly in an oxygen-rich environment, and anatase formation was well-developed at a calcination temperature of 750 °C for 1 h. Further analysis revealed that phase transition process of TiO 2 was influenced by TiO 2 content, disordered structure of CK and calcination conditions. TiO 2 particles formed single- or multi-layered chemical coatings on the active CK surface, although the presence of exposed mullite impeded coating formation. This study successfully developed cost-effective CK/TiO 2 composites with favorable pigment properties, providing a certain reference for CK selection. The composites have potential applications in coatings, pigments and related fields.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2024
·
IF 1.8
Yiting Wang,Mingze Xu,Jinhua Li,Tingsong Zhang
Titanium dioxide (TiO2) has been widely studied as a photocatalyst owing to its advantages of low cost, good stability, and nonpollution. However, they can only be excited by ultraviolet light, resulting in low utilization of solar energy and limited photocatalytic efficiency. In recent years, researchers have found that the nonprecious metal Al can effectively improve the photocatalytic performance of TiO2. However, the current studies focus only on enhancing the ultraviolet photocatalysis performance of semiconductors with Al on the substrate. In this study, Al nanoparticles (NPs) and TiO2 were prepared into composite materials. The effects of ligand, Al particle size, and the molar ratio of Al and TiO2 on the photocatalytic degradation of methylene blue (MB) by Al NPs and TiO2 composites (Al NPs/TiO2) were investigated. The results showed that the Al NPs/TiO2 prepared with a particle size of 200 nm of Al, glutathione as the ligand bridge, and an Al:TiO2 ratio of 2:1 were the most effective for the degradation of MB. The degradation rate of 5 mg/L MB solution within 70 min under visible light was up to 99.5%, which was three times higher than that of P25 TiO2. The photocatalytic performance was further enhanced under sunlight with a degradation rate of 99.7% within 50 min, which is four times higher than that of P25 TiO2 under the same light source. Therefore, Al NPs/TiO2 is a potential photocatalytic material for the treatment of organic pollutants in water.
研究领域:
环境科学
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材料科学
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化学
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产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 16
·12629-12644
·
IF 4.6
Yinqi Yang,Guoshuai Ma,Xiaoli Hu,Wei Wang,Zhonglin Du,Yao Wang,Xue-zhong Gong,Haoyu Tan,Fengxiang Guo,Jianguo Tang
In the context of sustainable development, the utilization of semiconductor materials for the degradation of dyes, antibiotics, heavy metals, and pesticides in wastewater under visible light has emerged as a focal point of contemporary research. In this investigation, a WO3@TiO2 composite was synthesized via a solvothermal method, with the composite exhibiting a molar ratio of 5% WO3 to TiO2 precursors demonstrating optimal photocatalytic degradation performance. This material achieved complete degradation of 20 mg per L Rhodamine B (RhB) dye and tetracycline (TC) antibiotic within 30 min. Furthermore, the effects of initial pollutant concentration and solution pH on catalytic efficacy were systematically explored. The findings revealed that at RhB concentrations below 40 mg L−1, the degradation proceeded at an accelerated rate, with a rate constant exceeding 0.128 min−1. The catalyst exhibited robust performance across a broad pH range, attaining peak degradation efficiency at pH ≈ 3. The exceptional photocatalytic prowess of the WO3@TiO2 composite is predominantly attributable to its distinctive hollow microstructure, the intimate interfacial synergy between WO3 and TiO2, and the efficient separation of photogenerated electrons and holes facilitated by the type-II heterojunction architecture.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2012
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IF 2.421
Z.L. Zhang,M. Wan,Y.L. Mao
A TiO 2 -based composite, ZnFe 2 O 4 /TiO 2 , was prepared with a commercial TiO 2 (Degussa P25) and ZnFe 2 O 4 nanopowders using a simple method. The composite was characterized by X-ray diffraction (XRD), UV–vis absorption spectrum, surface photovoltage spectroscopy (SPS) and SEM. The composite presents an enhanced photovoltaic effect compared with the pure TiO 2 . The trap distributions of TiO 2 and ZnFe 2 O 4 /TiO 2 composite were investigated and the energy levels of TiO 2 and ZnFe 2 O 4 were analyzed. The results indicate that the enhancement of photovoltaic effect is mainly due to the increase of photo-generated carrier concentration and improvement of the separation efficiency of photo-generated carriers by the addition of ZnFe 2 O 4 .
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 19
·19122-19133
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IF 2.8
Ren Bin,Wang Tiecheng,Qu Guangzhou,Deng Fang,Liang Dongli,Yang Wenli,Liu Meishan
As a highly active photocatalyst, g-C 3 N 4 /TiO 2 heterojunction nanocomposites were in situ synthesized by simple ultrasonic mixing and calcination by using TiO 2 and melamine as precursors. The morphology and structure of the prepared photocatalysts were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activities of g-C 3 N 4 /TiO 2 nanocomposites to degrade Orange II (AO7) under visible light irradiation were evaluated. Results showed that the photocatalytic rate of the prepared g-C 3 N 4 /TiO 2 photocatalyst to degrade AO7 was about three times than that of pristine TiO 2 and g-C 3 N 4 . The g-C 3 N 4 /TiO 2 composite with a ratio of 1:4 had the highest degradation efficiency for AO7 solution. Its degradation efficiency under acidic conditions was significantly higher than that under alkaline conditions. The enhancement of photocatalytic activity can be attributed to the formation of heterojunctions between g-C 3 N 4 and TiO 2 , which leads to rapid charge transfer and the efficient separation of photogenerated electron-hole pairs. The recycling experiment indicated that the photocatalyst of g-C 3 N 4 /TiO 2 nanocomposites still maintained good photochemical stability and recyclability after five cycles; this finding was important for its practical applications. A series of free radical trapping experiments showed that •O 2 − played a crucial role in the degradation of AO7.
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研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
NANO
·
2018
·
IF 1.1
Kaidi Li,Fangfang Zhang,Huiming Wang,Yalan Zhou,Lixin Zhao,Jimin Du,Yating Gao,Weimin Wang,Dae Joon Kang
Here, the lamellar-shaped Bi 2 S 3 grown on a porous TiO 2 monolith was obtained by a two-step method including a sol–gel route and hydrothermal treatment. The photocatalytic activity of the as-synthesized Bi 2 S 3 /TiO 2 composites was evaluated for photodegradation of methylene blue (MB) dye in aqueous solution under the visible-light irradiation. Based on our experimental results, 5% (molar ratio of Bi 2 S 3 to TiO 2 ) Bi 2 S 3 /TiO 2 photocatalysts exhibited a maximum photodegradation rate of MB up to 96.9% under visible-light irradiation for 120 min. Our findings indicated that the lamellar-shaped Bi 2 S 3 can extend the light absorption up to visible areas, and porous TiO 2 can provide enhanced specific surface area and more mass transfer pathway to enhance the photodegradation efficiency. Furthermore, porous TiO 2 can accept the electrons from the Bi 2 S 3 conduction band due to the relatively positive electrode potential to impede the photoproduced electron and hole combination to result in advanced photocatalytic performance.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
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IF 3.133
Zhengfeng Huang,Kaiming Xue,Yanzhao Zhang,Xudong Cheng,Peimei Dong,Xiwen Zhang
To integrate the CO 2 capture and photoreduction processes into a single system, MOFs-derived TiO 2 was loaded onto polyethersulfone (PES) or polyethylenimine (PEI)/PES electrospun mats using electrospray method. The mats incorporated with PEI has exhibited excellent CO 2 capture capacity and MOFs-derived TiO 2 doped with C (denoted as C/TiO 2 ) extended the absorption edge to >400 nm. The introduction of PEI that resulted in the C/TiO 2 -PEI/PES sample has significantly increased the CO 2 photoreduction yield by 81% when compared to C/TiO 2 -PES sample. The C/TiO 2 -PEI/PES sample could still capture and convert CO 2 into CO even in the low CO 2 atmosphere.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 20
·11851-11860
·
IF 3.119
Rongjing Wang,Yaru Li,Qianyi Sun,Kaihua Gao,Yufu Pan,Meng Li,Feitian Zhang,Ping Na
In this paper, a new photocatalyst with TiO2 nanospheres decorated on ultrathin layered thiostannate H4xK2xSn2−xS4+x (X = 0.5–0.6, HKTS) nanosheets was successfully synthesized by a facile solvothermal method combined with the hydrolysis of tetrabutyl titanate and it was denoted as HKTS/TiO2. By adjusting the content of tetrabutyl titanate, composites with different Sn/Ti molar ratios were prepared. The composites were applied for RhB degradation under visible light irradiation, and the optimum proportion of HKTS/TiO2 was obtained. The results of X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy confirmed that TiO2 was successfully decorated on HKTS nanosheets. The combination of TiO2 and HKTS extended the absorption wavelength of TiO2 from UV to visible light range, and the separation efficiency of photoexcited electron–hole pairs was also enhanced. The photocatalytic degradation rate of RhB over HKTS/TiO2-1.0 was almost 97.9% after 60 min illumination, which was higher than those of HKTS and pure TiO2. The photocatalyst exhibited excellent reusability and stability as the degradation rate of RhB was 95.7% even after three cycles. The photocatalytic mechanism experiment indicated that ·O2− and h+ played a dominant role in the photocatalytic process. All these results indicate that the newly fabricated HKTS/TiO2 composites provide a high-performance photocatalyst for waste water treatment, and the application of thiostannate can be extended to the field of photocatalytic materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Chunzheng Wu,Ling Fang,Fangjie Ding,Genxiang Mao,Xiaogu Huang,Shun Lu
Ultra-small Pt nanoparticles loaded on TiO 2 through in-situ photo-deposition for H 2 production via photo reforming of wastepaper was prepared in this study. The effect of noble metal cocatalyst, Pt loading, content of paper (e.g., napkin), and concentration of NaOH was investigated. Consequently, a highest H 2 production rate of 614.7 µmol/g/h was achieved in the optimum condition. It was found that both the solid paper and the dissolved part in the NaOH solution could scavenge the photo-generated holes and contribute to H 2 production. Our research provides a potential route for the reuse of wastepaper to produce clean fuel.
研究领域:
环境科学
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能源科学
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材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 24
·10608-10617
·
IF 3.591
Huazhen Cao,Chenxi Jia,Huibin Zhang,Guangya Hou,Yiping Tang,Guoqu Zheng
MoS2/TiO2 composite photocatalysts with visible-light activity were in situ fabricated on titanium substrates via a simple two-step hydrothermal synthesis method, using titanium foil as the Ti source. The structure, morphology, composition and optical properties of the as-prepared photocatalysts were characterized by XRD, SEM, TEM, XPS, UV-vis and PL analyses, respectively. TiO2 exists in the form of nanofibers (NFs), with their length ranging from about 40 nm to 150 nm and a diameter of about 10 nm. MoS2 microspheres are homogeneously dispersed on the surface of TiO2 NFs, forming a MoS2/TiO2 composite. The photocatalytic oxidation rate of NO2− under simulated solar irradiation can reach 62% by the MoS2/TiO2 composite synthesized in a hydrothermal system with a C2H5NS/Na2MoO4 molar ratio of 1 : 0.6 under 200 °C for 24 h, which is much higher than that by pristine TiO2 NFs, P25 and pure MoS2. The photocatalytic oxidation process of NO2− obeys the Langmuir–Hinshelwood kinetic model (pseudo-first order reaction), and the reaction rate constant (k) of the as-prepared composite is about 0.19194 h−1. The presence of MoS2 significantly enhances the visible light absorption of the catalyst, which is conducive to the generation of electrons and holes, thus guaranteeing good photoactivity of the catalyst. The band gap of the composite is about 2.2 eV, indicating the enhanced absorption of visible light. By this simple and low-consumption method, the composite is firmly combined with the titanium substrate, which is convenient for recycling and environmentally friendly implementation.
研究领域:
材料科学
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环境科学
·
光催化技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Fei Wang,Jingxia Gao,Delin Yang,Haoming Li,Jinping Zhang,Jie Liu,Yong Liu,Fengzhang Ren
The uneven lithium deposition on Cu current collector and poor interface stability of lithium metal/electrolyte would lead to rapid capacity decay and potential safety risks, which severely hinder the practical applications of lithium metal batteries. In this work, the in-situ derived Ti 3 C 2 T x MXene/TiO 2 (labeled as MXene/TiO 2 ) composite with favorable lithiophilicity and conductivity is applied as modified layer on Cu foil current collector (labeled as MXene/TiO 2 @Cu) to obtain the uniform and dense lithium plating. Compared with bare Cu and commercial TiO 2 nanoparticles modified Cu current collector (labeled as Nano TiO 2 @Cu), the MXene/TiO 2 @Cu combines abundant lithium nucleation sites and improved conductivity, which could promote uniform lithium plating and stripping at high current density and effectively avoid the generation of dead lithium or lithium dendrites. As a result, the MXene/TiO 2 @Cu-based symmetric battery could stably cycle for 2000 h at high current density of 3 mA cm −2 with capacity of 3 mAh cm −2 , and the MXene/TiO 2 @Cu-Li‖LiFePO 4 full battery could maintain the high reversible capacity of 104.0 mAh g −1 at 1 C after 500 cycles. This work provides an effective and novel protection strategy for Cu current collector, which is critical for the design of lithium metal batteries with favorite rate capability at high current density.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Baiyang Xia,Pan Cao,Xiaoxue Tang,Qi Shi,Yuguang Lv,Xiangyu Zhang
Improving the separation efficiency of photogenerated electron-hole pairs is crucial for the enhancement of semiconductor photocatalytic performance, and semiconductor-coupled strategies have attracted much attention due to their numerous advantages as well as perfect results in improving photocatalytic activity. Herein, we report a TiO 2 -based composite photocatalytic material solidified on eggshell membrane (ESM), a kitchen waste-biomass material that is usually considered as a waste. TiO 2 -WO 3 NPs were efficiently adsorbed on the ESM fiber network with a large specific surface area (TiO 2 -WO 3 -ESM), and the photocatalytic activity was remarkably enhanced, realizing a highly efficient catalytic degradation of the organic pollutant in water, methylene blue (MB) in water. The composites remained highly stable after five cycles of recycling, and in addition, the catalytic materials were well adapted to the natural water environment and showed significant decolorization effects on the other four dyes. This study provides new ideas for designing other efficient systems for the purification of dye wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）