COMPOSITES PART B-ENGINEERING
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2017
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IF 4.727
Tong Zhang,Bo Jiang,Yudong Huang
A novel polymerizable benzophenone photoinitiator containing acryloxy (BPA) was synthesized. The photopolymerization of photosensitive methacrylic-silicone resins (MASR) initiated by BPA was studied. Results show that BPA is an efficient photoinitiator, which could generate radicals from the photolysis reaction and be consumed via copolymerizing with MASR. The designed UV-curing silicone resins system initiated by BPA showed a high carbon-carbon double bonds conversion above 80% after 20 s UV radiation. In addition, reduced graphene oxide (rGO)-TiO 2 composites were elaborated by hydrothermal reaction . The synergistic effects from graphene and TiO 2 further enhanced the carbon-carbon double bonds conversion of MASR to 86% with 15 s UV irradiation, demonstrating that the incorporated rGO-TiO 2 significantly improve the formulation UV-curing reactivity. Additionally, UV-cured MASR with rGO-TiO 2 showed an excellent thermal stability. This work proposes an efficient strategy to improve the polymerization degree of UV-curable photosensitive silicone resins.
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Journal of Physical Chemistry C
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2018
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IF 4.484
Huihui Liu,Zongwei Chen,Lei Zhang,Dongbo Zhu,Qun Zhang,Yi Luo,Xiang Shao
To achieve a best promotion effect of photocatalytic activity, an optimized interface between graphene and TiO2 is highly desirable, which is, however, difficult to realize via conventional preparation of the graphene/oxide composites. To this end, we here develop a novel strategy to directly grow graphene on the anatase-TiO2 (a-TiO2) nanosheet via an ambient pressure chemical vapor deposition (AP-CVD) method using acetylene as the precursor. Such a recipe successfully avoids the intercalating contaminations, meantime ensures the contact uniformity of graphene over a-TiO2 (G/a-TiO2). The ultrafast transient absorption spectroscopy clearly reveals the efficient charge transfer from TiO2 to graphene in assisting the separation of photoinduced electron–hole pairs. Moreover, the measurements of photocurrent and the photocatalytic degradation of methyl orange turn out that the composite with double layer graphene shows the best performance, which can possibly result from the competition of interlayer interactions within the multilayer graphene and the interactions between graphene with TiO2.
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APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Xiaojie Zhang,Jipeng Yang,Tiancong Cai,Guoqiang Zuo,Changqing Tang
Boron carbide (B 4 C) nanoparticles-decorated anatase titanium dioxide (TiO 2 ) nanosheets photocatalysts were synthesized by a hydrothermal method in the presence of hydrofluoric acid and characterized by field emission scanning electron microscope, high-resolution transmission electron microscope, UV–vis diffuse reflectance spectra, photoluminescence spectra, etc. With metallic Pt nanoparticles as a co-catalyst, the as-synthesized B 4 C/TiO 2 composites were evaluated using photocatalytic CO 2 or H 2 O reduction to solar fuels such as methane and hydrogen. Under either simulated sunlight or visible light irradiation, coupling p-type B 4 C with n-type anatase TiO 2 significantly improved the photocatalytic performance. Both photoluminescence and transient photocurrent measurements indicated that the interfacial coupling effect between B 4 C and anatase TiO 2 could significantly promote photo-excited charges separations. On the basis of measurements and literatures, a possible mechanism of excited charges transfer at the B 4 C-anatase TiO 2 heterojunction interface during irradiation was deduced.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Yu Cheng,Quanbo Yu,Weihua Zhang,Zhiqiang Liu,Jue Ding,Hongzhe Pan,Yiping Li,Dan Wu,Minghua Zhu,Xianchuan Xie,Ningyuan Zhu
Multispecies biofilm exhibited high resistance to nanotoxicity by secreting extracellular polymeric substances (EPS) and undergoing alterations in the community composition. Scarce information was available to assess how these changes could further influence the transfer of nanoparticles (NPs) through the biofilm-based food chain. Photic biofilm was exposed to two distinct NPs (ZnO and TiO 2 ) and subsequently grazed by snails. Exposure to different NPs led to variations in biomass, chlorophyll content, EPS productivity, alpha diversity, and community composition of the photic biofilm. The presence of ZnO NPs facilitated the growth of phylum Cyanobacteria while TiO 2 promoted EPS productivity of photic biofilm. EPS were capable of embedding NPs (TiO 2 and ZnO) within its matrix, thereby mitigating their aggregation within the biofilm matrix. These alterations were subsequently confirmed to have an impact on the trophic transfer factors (TTF) of NPs through the constructed biofilm-snail food chain. The TTF of ZnO was lower than that of TiO 2 in feeding scenario 1 (only fed on TiO 2 or ZnO biofilm) but higher than that of TiO 2 in feeding scenario 2 (fed on TiO 2 and ZnO biofilm simultaneously), which was attributed to the shifts in the algae composition and a smaller size of ZnO NPs in EPS. This study demonstrated that the response of photic biofilm to NPs further affected the TTFs of NPs through the food chain.
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PubMed
高影响因子
JOURNAL OF CRYSTAL GROWTH
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2025
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IF 2
Bin Han,Dianchun Ju,Zhuo Chen,Yunjie Bao,Yingying Li,Qin Yan,Yuxia Liu,Chunyu Chen
Titanium dioxide nanoparticles (TiO 2 NPs) have garnered considerable attention within the materials science community due to their superior availability, high photocatalytic activity, remarkable thermal stability, and cost-effectiveness. Recently, a growing interest has emerged in their potential applications within scientific research. Therefore, the development of more efficient and controllable preparation methods has been concentrated in current studies. This study uses deep eutectic solvents (DESs) as solvents and structure-directing agents to provide a gentle and environmentally friendly process for the controlled synthesis of TiO 2 NPs. Furthermore, it examines their photocatalytic degradation performance on dye wastewater under full-spectrum light sources. The findings reveal that by introducing TiCl 4 -DESs in a mass ratio of 1:10 in a hydrolytic solution of PEG-H 2 O with a mass ratio of 1:1, and subsequently, calcining the mixture at 550 ℃ in a muffle furnace, uniform spherical pure anatase–type TiO 2 NPs with good dispersion and an average particle size of approximately 14.01 nm can be obtained. After 60 min of exposure to a full-spectrum light source, the removal rate of methylene blue reached 99.2 %. After 180 min, the degradation rates of rhodamine B and methyl orange were found to be 97.0 % and 80.7 %, respectively. These results demonstrate that the application of DESs facilitates the green and mild modulation of the nanostructures and grain sizes of TiO 2 NPs, effectively enhancing their photocatalytic activity.
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Catalysis Science & Technology
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2025
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IF 4.2
Peiyan Lin,Renhong Chen,Sheng Xu,Xia Xia,Fang Zhao,Xuefeng Ren,Yumeng Lu,Liguo Gao,Junjiang Bao,Anmin Liu
Electrocatalytic nitrate (NO3−) reduction to ammonia (NH3) has emerged as an environmentally friendly method for ammonia production due to its clean, efficient, and sustainable attributes. In this study, we prepared Co-doped TiO2 materials with graphene oxide (GO), Co–TiO2/GO, as potential NO3−RR electrocatalysts. Scanning electron microscopy (SEM) images revealed a spherical structure for the catalysts. Following a series of electrochemical tests, our findings indicated that Co-doping significantly enhances the NO3−RR activity of TiO2. Furthermore, incorporating GO notably diminishes the initial potential of titania-based catalysts, thereby strengthening the NO3−RR performance of TiO2. The engineered Co–TiO2/GO exhibits superior NO3−RR electrochemical properties, achieving an NH3 yield of up to 7.424 mg h−1 cm−2 and a Faraday efficiency of up to 56.5% at −1.1 V vs. RHE potential. This performance surpasses that of Co–TiO2, with minimal by-product NO2− generation. We also conducted tests without the catalyst and in the absence of NO3− in the electrolyte, confirming that the nitrogen in the synthesized ammonia was not derived from impurities in the catalyst or the electrolyte. Furthermore, Co–TiO2/GO demonstrated robust stability during eight cycles and 24 hours of continuous testing for the NO3−RR performance. Theoretical calculations suggest that doping TiO2 with Co and GO can enhance its electronic structure and conductivity, thereby facilitating the electrochemical synthesis of ammonia.
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ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Mei Ma,Jia-qi Bai,Huangfei Liu,Ben Liu,Zhangkai Qian,Suiqin Li,Jingshuai Chen,Mengdie Cai,Song Sun
The preparation of methyl-substituted amines by direct N-methylation of amines with CO2/H2 is an important reaction for CO2 utilization and organic synthesis. However, the design and construction of effective and stable non-noble-metal catalysts for this reaction remain challenging. Here, a cheap non-noble-Cu-based catalyst was prepared and applied in the direct N-methylation reaction of N-methylaniline with CO2 and H2. 5%Cu-ZnO(3.75%)/TiO2 showed 98.8% yield with an initial TOF of 7.7 h–1 after 24 h under 453 K, 1.5 MPa CO2, and 4.5 MPa H2, which was superior to 5%Cu/TiO2, 5%Cu/ZnO, and reported Cu-based catalysts. Furthermore, 5%Cu-ZnO(3.75%)/TiO2 can be reused at least four times and applied to the direct N-methylation of various amines with excellent selectivity. The various characterizations and experimental results showed that Cu0 was the active site, and 5%Cu-ZnO(3.75%)/TiO2 exhibited the largest surface Cu0 amount, thereby contributing to superior catalytic performance. The reaction mechanism of the direct N-methylation reaction of N-methylaniline with CO2 and H2 was proposed based on spectroscopic studies, kinetic studies, and control experiments. The reaction proceeded with the HCHO and N-methylformanilide intermediates, and the formation of HCHO from H2 and CO2 was the rate-determining step.
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Materials Today Communications
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2025
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IF 4.5
Lifeng Chi,Xiutong Wang,Siyao Guo,Meipeng Ren,Hua Guo,Mingchun Wang,Youbo Nan,Jinguo Wang
Photocathodic protection has obtained enormous attention in the field of metal corrosion control as an efficient and eco-friendly technology. Developing the photoelectrode with good photoelectrochemical properties is a prerequisite for achieving satisfactory photocathodic protection performance. Here, the NH 2 -MIL-101(Cr)/TiO 2 heterostructures are prepared. Meanwhile, the organic linkers and metal ions from NH 2 -MIL-101(Cr) are used to synthesize the N- and Cr-doped TiO 2 anodes, respectively. The UV–vis DRS, photoluminescence spectra and photoelectrochemical tests conducted under visible light demonstrate the enhanced light absorption, suppressed photoinduced charge carrier recombination, and accelerated separation and transfer rates of photoinduced electron-hole pairs in the TiO 2 composites. The 304 stainless steel connected with NH 2 -MIL-101(Cr)/TiO 2 heterostructures shows the most negative potential (about −0.72 V vs. SCE) and satisfied stability in a 3.5 wt% NaCl solution. The result can be explained by the significantly enhanced optical and photoelectrochemical properties and the strong electric field intensity in the composite heterojunctions. Besides, it has been observed that the NH 2 -MIL-101(Cr)/TiO 2 heterostructures exhibit the best photocathodic protection performance than Cr and N-doped TiO 2 anodes. This research broadens the application scope of MOFs in corrosion resistance and helps to assess the effect of heterostructure construction and element doping on TiO 2 .
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Qihui Huang,Hui Zheng,Xia Wang,Qi Fu,Tao Gong,Chang Liu,Huijuan Ma,Linmin Ye,Xinping Duan,Youzhu Yuan
Hexamethylene diamine, an important chemical intermediate for polyamides, can be synthesized through the two-step route of caprolactam (CPL) ammonolysis to 6-aminocapronitrile (ACN), followed by hydrogenation. This method has received increasing attention from academia and industry. However, studies on the catalyst structure–performance correlation in CPL ammonolysis are still sporadic. In this work, a series of anatase TiO2 with different oxygen vacancy concentrations was prepared by chemical reduction using NaBH4. The oxygen vacancy on TiO2 surface, presented as Ti3+ sites, substantially enhances the adsorption and activation of NH3, which are demonstrated as the key steps in ammonolysis. Owing to the synergistic effect of Ti3+ and Ti4+ species, the CPL conversion rate and ACN selectivity of 85 and 97%, respectively, are achieved within 250 h. Density functional theory calculations showed that the intermediates on oxygen vacancy-rich TiO2 had a more favorable adsorption energy compared to those on intact TiO2, which is in good agreement with the experimental results.
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高影响因子
Journal of Materials Chemistry C
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2024
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IF 5.7
Sheng Ding,Wei Gan,Jun Guo,Ruixin Chen,Run Liu,Ziwei Zhao,Jianrou Li,Zhaoqi Sun,Miao Zhang
In this study, the S-scheme heterostructure photocatalyst of SnS2/TiO2 (denoted as ST) ultrathin nanosheet-nanorod arrays with high efficiency for the degradation of tetracycline hydrochloride (TC-HCl) was successfully prepared by a two-step hydrothermal method. By expanding the light absorption area and hindering the reorganization of light-generated e--h+ pairs, the binding of TiO2 to SnS2 prepared photocatalysts with highly efficient photocatalytic activity and long-term stability. The results showed that the optimized photocatalyst samples all contributed to the degradation efficiency of tetracycline hydrochloride within 90 min than the photocatalytic degradation of pure TiO2 (41.1%). Among them, the ST loaded with 30 mM SnS2 exhibited the highest photocatalytic degradation efficiency of TC-HCl (93.4%). The reaction rate constant K is 0.02597 min-1, and the transient photocurrent density of ST-30 was up to 34.35 A/cm2, which were 5.78 and 10.54 times higher than that of unmodified TiO2. At the same time, the effects of photocatalysts on the degradation efficiency of TC-HCl under different conditions (pH values, inorganic anions and antibiotic concentrations) were systematically investigated. The inhibition of the degradation efficiency of tetracycline hydrochloride by SnS2/TiO2 heterojunction with the addition of different free radical scavengers indicated that ·O2- and ·OH were the main active substances involved in the degradation process. In addition, two environmentally friendly degradation pathways were proposed based on the analysis of liquid chromatography-mass spectrometry (LC-MS) results and the toxicity assessment of various intermediates in the degradation process. Finally, the photocatalytic mechanism of SnS2/TiO2 heterojunctions was proposed based on the optical and electrochemical properties of the photocatalysts as shown in the tests. These results indicate that the synthesized S-scheme heterostructure photocatalyst SnS2/TiO2 can significantly improve the light trapping ability and reduce the photoelectron-hole complexation rate, which is a promising approach to enhance the degradation efficiency of photocatalysts.
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CERAMICS INTERNATIONAL
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2024
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IF 5.1
Yang Zhang,Xingwei Wang,Shuangshuang Yang,Chuanpeng Li,Tao Dong,Qiangliang Yu
The magnetic microwave absorption (MA) materials are prone to corrosion in high temperature and high humidity environments, leading to a deterioration in the MA performance, so, the development of composite coatings with comprehensive properties such as excellent absorption performance, corrosion resistance , and oxidation resistance holds significant importance in the field of stealth technology. In this study, a core-shell structure MA materials titanium dioxide coated carbonyl iron particle (CIP@TiO 2 ) was prepared and utilized as a filler in the preparation of composite coatings. The results show that the low-frequency impedance modulus of composite coating improves by three orders of magnitude from 4.5 × 10 5 Ω cm 2 to 2.5 × 10 8 Ω cm 2 , demonstrating outstanding corrosion resistance. The TiO 2 shell not only improves CIP's electromagnetic parameters but also optimizes the impedance matching of the composite material. The CIP@TiO 2 coating achieves a minimum reflection loss of −56.8 dB at a thickness of 1.2 mm and an effective bandwidth of 6.57 GHz at a thickness of 0.6 mm, demonstrating excellent absorption performance. This study provides a novel approach for preparing composite materials with superior corrosion-resistant and absorptive properties.
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高影响因子
PROGRESS IN ORGANIC COATINGS
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2024
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IF 6.5
Yu Qi,Peng Wu,Tengfei Huo,Zhuoyi Li,Xueli Li,Yantu Zhang
Anti-corrosion coatings ensure material safety and extend service life, serving as important safeguards in the fields of construction, infrastructure, petrochemicals, and marine engineering. Therefore, this study introduces a dual-nanofiller synergistic system by blending epoxy resin, 3-hydroxy-2-naphthylhydrazine modified reduced graphene oxide, and TiO 2 nanofillers modified with the silane coupling agent KH570 to create a novel nanocomposite coating. Compared to traditional coatings, the synergistic effect of the dual nanofillers formed a dense nanonetwork structure, enhancing the corrosion resistance and mechanical properties of the coating. The results show that the composite coating has a smooth surface with minimal crack formation. In addition, the toughness and wear resistance of the composite coatings were improved. Electrochemical Impedance Spectroscopy analysis revealed that the impedance value of the Dual nanofiller composite coating was two orders of magnitude higher than that of the other coatings, showing the strongest corrosion resistance. A 45-d long-term immersion experiment was conducted on the composite coatings. The results showed that after 45 d of immersion in 3.5 wt% NaCl solution at room temperature, the Z modulus of the dual nanofiller composite coating decreased from 10 9 Ω·cm 2 to 10 7 Ω·cm 2 . Although the performance declined, the coating still exhibited relatively high corrosion resistance and no significant physical defects, maintaining a good overall structure. This study provides an ideal method for enhancing the corrosion resistance of coatings by using a dual-nanofiller synergistic system.
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