CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ruizhi Xue,Ruirui Huang,Binbin Wu,Ning Li,Qing Chang,Chaorui Xue,Caihong Hao,Huiqi Wang,Jinlong Yang,Shengliang Hu
Interfacial solar driven water evaporation (ISDWE) and photocatalytic pollutant degradation (PPD) have been considered as efficient and green technologies for tackling the water crisis. Here, through hydrothermal treatment of TiH 1.924 /Ti powders, we designed a hybrid material composed of partially oxidized TiH 1.924 and TiO 2 nanosheets with outstanding ISDWE and PPD performances. Titanium suboxides can be formed inside the compound of partially oxidized TiH 1·924 /TiO 2 nanosheet, and induce efficient solar-thermal transformation. Meanwhile, TiO 2 nanosheet is conducive to reducing the water vaporization enthalpy, ensuring adequate water supply, and enlarging the surface area for evaporation. Due to the synergies between partially oxidized TiH 1.924 and TiO 2 nanosheet, the water evaporation rate achieved 1.70 kg m −2 •h −1 under solar radiation of 1.0 kW m −2 , which is higher than most reported titanium compounds. The investigation on the PPD performance showed that the photothermal effect and band alignment collaboratively improved the photodegradation of rhodamine B by partially oxidized TiH 1·924 /TiO 2 nanosheets. The excellent PPD property can promote the long-term ISDWE application of partially oxidized TiH 1·924 /TiO 2 nanosheets by avoiding the dye accumulation. This study may provide valuable information for developing advanced composites, ISDWE and PPD technologies.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 1
·1-12
·
IF 2.8
Liang Xuan,Xue Suting,Wu Wangchen,Feng Qin,Zheng Xudong,Zhang Yakang,Xu Song,Zhou Man,Li Zhongyu
Herein, a series of CuS particles anchored three-dimensional ordered macroporous TiO 2 (CuS/3DOM-TiO 2 ) composites were fabricated by a biocompatible and environmental-friendly biomolecule-assisted route. For the first time in the macroporous 3DOM-TiO 2 , L-cysteine acted as multiple roles including sulfur source and chelating agent for anchoring of CuS particles. During the regulation by Cu/Ti molar ratios from 0.3 to 2, the average size of CuS particle which anchored on inner surface of 3DOM-TiO 2 was well-controlled from about 50 to 20 nm. The photocatalytic activities were investigated by visible-light degradation of methylene blue (MB). The highest activity of CuS/3DOM-TiO 2 was emerged when Cu/Ti equaled to 1. This optimized CuS/3DOM-TiO 2 -1 reached 99% in 180 min, which was 60% higher than that of pure TiO 2 . After four cycles, the photocatalytic activity of CuS/3DOM-TiO 2 retains more than 80% of its original performance. L-cysteine highly promoted the adhesion between CuS and TiO 2 which provided good cycling ability.
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CHEMOSPHERE
·
2023
·
IF 8.8
Lei Han,Liguo Shen,Hongjun Lin,Zhengyi Huang,Yanchao Xu,Renjie Li,Bisheng Li,Cheng Chen,Wei Yu,Jiaheng Teng
The oily water treatment is becoming one of the hottest topics due to that increase of offshore oil transportation and the various accident oil leakages . In this study, a functional TiO 2 -ABS composite membrane was generated through the three-dimensional (3D) printing strategy for the first time and was conducted to simulated oily water treatment . The TiO 2 -ABS composite membrane demonstrated a significant promotion in hydrophilicity and oleophobicity which were evidenced by the water contact angle of 14.8° and the underwater oil contact angle of 144.7°, respectively. The optimal modified membrane had both exceedingly high flux (1.8 × 10 5 L m −2 ·h −1 ) and oil rejection rate (99.5%). Moreover, the results of filtration cycles of 10 days and extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory demonstrated that the modified membranes took possession of excellent stability and antifouling property. What was more, the TiO 2 -ABS composite membrane revealed over 99% rejection to all five types of oil/water systems. The interestingly experimental results indicated that the prepared membrane possessed a broad development trend and application prospect in the field of oily water treatment.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 11
·e53618
·
IF 3
Datuan Li,Xingxu Gao,Min Cao,Lei Sheng,Ling Yang,Xin Xie,Yun Gong,Qingyang Hu,Qiangqiang Xie,Tao Wang,Jianping He,Xianli Huang
Traditional polyolefin separators cannot guarantee safety for lithium-ion batteries at high temperature due to their low melting point, especially for high power discharge. Therefore, it is imperative to develop separators with excellent thermal stability. In this paper, we have prepared TiO 2 modified PVDF composite separators by electrospinning. When compared with commercial PE separators, this kind of composite separators show superior thermal stability at 160°C. In addition, it is found that the 0.5-TiO 2 @PVDF separator exhibits excellent flame retardant and optimal tension strength. Meanwhile, the 0.5-TiO 2 @PVDF separator exhibits ideal liquid electrolyte storage capacity, which improves the ionic conductivity (0.68 mS cm −1 ). As a result, the LiCoO 2 ||Li cells with 0.5-TiO 2 @PVDF separator have high discharge capacity retention rate at a current density of 1 C (300 cycles) and excellent rate performance (1.75 mAh at 5 C). In short, nano-TiO 2 modified PVDF separator has a great application prospect in high-performance and high-safety lithium-ion batteries.
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Advanced Science
·
2022
·Vol. 10
·期 2
·2204041
·
IF 17.521
Ningning Liu,Lanlan Yu,Baojun Liu,Fei Yu,Liqing Li,Yi Xiao,Jinhu Yang,Jie Ma
Constructing faradaic electrode with superior desalination performance is important for expanding the applications of capacitive deionization (CDI). Herein, a simple one-step alkalized treatment for in situ synthesis of 1D TiO 2 nanowires on the surface of 2D Ti 3 C 2 nanosheets, forming a Ti 3 C 2 -MXene partially derived hierarchical 1D/2D TiO 2 /Ti 3 C 2 heterostructure as the cathode electrode is reported. Cross-linked TiO 2 nanowires on the surface help avoid layer stacking while acting as the protective layer against contact of internal Ti 3 C 2 with dissolved oxygen in water. The inner Ti 3 C 2 MXene nanosheets cross over the TiO 2 nanowires can provide abundant active adsorption sites and short ion/electron diffusion pathways. . Density functional theory calculations demonstrated that Ti 3 C 2 can consecutively inject electrons into TiO 2 , indicating the high electrochemical activity of the TiO 2 /Ti 3 C 2 . Benefiting from the 1D/2D hierarchical structure and synergistic effect of TiO 2 and Ti 3 C 2 , TiO 2 /Ti 3 C 2 heterostructure presents a favorable hybrid CDI performance, with a superior desalination capacity (75.62 mg g −1 ), fast salt adsorption rate (1.3 mg g −1 min −1 ), and satisfactory cycling stability, which is better than that of most published MXene-based electrodes. This study provides a feasible partial derivative strategy for construction of a hierarchical 1D/2D heterostructure to overcome the restrictions of 2D MXene nanosheets in CDI.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jie Zhao,Yunning Chen,Renquan Guan,Xueying Cheng,Zhengkai Wu,Nana Zhao,Qingkun Shang,Yingnan Sun
In this paper, we successfully constructed two composite photocatalysts TiO 2 @PDI-NapSO 3 H and Fe-TiO 2 @PDI-NapSO 3 H by utilizing water-soluble PDI derivatives to bond with TiO 2 or iron-doped TiO 2 . Their photocatalytic performance to degrade phenol and diclofenac sodium (DCF) under visible light were investigated. The results show that PDI-NapSO 3 H can effectively improve the optical absorption properties of TiO 2 . Furthermore, the oxygen vacancy produced by doping of Fe in TiO 2 prevents the recombination of photogenerated carriers effectively. The larger conjugate plane of PDI-NapSO 3 H provides a convenient channel for the migration and separation of photogenerated carriers. Thus almost 99 % of phenol or DCF can be degraded by Fe-TiO 2 @PDI-NapSO 3 H within 90 or 120 min, respectively. However, the photocatalytic activity of Fe-TiO 2 @PDI-NapSO 3 H is better. The rate of phenol degradation is much higher than that of TiO 2 @PDI-NapSO 3 H. Further, through the photoelectric response characteristic analysis, radical trapping experiment and EPR test, the effects mechanism of the energy band structure, photogenerated carrier separation efficiency on the photocatalytic performance of Fe-TiO 2 @PDI-NapSO 3 H were discussed. In addition, the possible degradation pathways of DCF and the reasons for the obvious reduction of environmental toxicity after photocatalytic degradation were proposed.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiaodong Jiang,Jiankun Wang
TiO 2 is one of the most widely used photocatalytic semiconductors. However, the rapid recombination of photogenerated electron-hole pairs severely weakens its photocatalytic activity. Herein, a three-dimensional TiO 2 /reduced graphene oxide (TiO 2 -rGO) aerogel with enhanced interfacial charge transfer was synthesized by a facile hydrothermal method , and its photocatalytic degradation of Methylene Blue (MB) and Reactive Red 24 (RR24) dyes was investigated. The photocatalytic results showed that TiO 2 –rGO aerogel possesses excellent photocatalytic activity, and its photocatalytic degradation rate towards dyes is more than 3.8 times that of pure TiO 2 and more than 2.7 times that of TiO 2 -GO aerogel. Characterization results indicated that the significantly enhanced photocatalytic activity of TiO 2 -rGO aerogel could be attributed to the enhanced π–conjugated structure of rGO, which can effectively increase interfacial charge transfer and inhibit electron-hole pairs recombination. The mechanism suggested that OH and O 2 − are the active species in the photocatalytic degradation process. Our findings can provide an important reference for the preparation of high-performance TiO 2 -based photocatalysts.
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Nanomaterials
·
2023
·Vol. 13
·期 1
·211
·
IF 5.3
Juanjuan Zhou,Wenying Zhou,Mengxue Yuan,Xinbo Dong,Jiebing Zhang,Xuejiao Zhang,Yanqing Zhang,Xiaolong Chen,Yanrong Chen,Xiangrong Liu
An insulating shell on the surface of conductive particles is vital for restraining the dielectric loss and leakage current of polymer composites. So as to inhibit the enormous loss and conductivity of pristine nickel (Ni)/poly(vinylidene fluoride)(PVDF) composites but still harvest a high dielectric permittivity (εr) when filler loading approaches or exceeds the percolation threshold (fc), pristine Ni particles were covered by a layer of titanium dioxide (TiO2) shell via a sol–gel approach, and then they were composited with PVDF. The impacts of the TiO2coating on the dielectric performances of the Ni/PVDF composites were explored as a function of the filler concentration, the shell thickness and frequency. In addition, the dielectric performances were fitted using the Havriliak–Negami (H–N) equation in order to further understand the TiO2shell’s effect on polarization mechanism in the composites. The Ni@TiO2/PVDF composites exhibit highεrand enhanced breakdown strength (Eb) but remarkably suppressed loss and conductivity when compared with pristine Ni/PVDF because the TiO2shell can efficiently stop the direct contact between Ni particles thereby suppressing the long–range electron transportation. Further, the dielectric performances can be effectively tuned through finely adjusting the TiO2shell’ thickness. The resulting Ni@TiO2/PVDF composites with highεrandEbbut low loss show appealing applications in microelectronics and electrical fields.Keywords:dielectric properties;metal;core–shell structure;polymer composites
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 6
·3462-3470
·
IF 3.9
Junlang Tan,Yong Guo,Futong Ren,Jingchang Zhao
Due to the boom of the electronic information industry, dielectric ceramic materials are widely applied in passive components such as multilayer ceramic capacitors. In this article, Y 2/3 Cu 3 Ti 4 O 12 –TiO 2 composite ceramics with outstanding dielectric properties ( ε r = 2.29 × 10 6 at 20 Hz, ε r = 4.49×10 5 at 1 kHz) were successfully prepared by hydrothermal and in situ solid-state methods. The minimum dielectric loss value (at 1 kHz) of the obtained composite ceramics is about 0.57. The experimental results show that Y 2/3 Cu 3 Ti 4 O 12 has a composite perovskite structure with cation vacancies, which causes internal electron-pinned defect-dipole, and the easy entry of excessive titanium ions to produce donor defects. Meanwhile, the heterogeneous grains with a pomegranate-like microstructure were observed in the prepared composite ceramics, and interfacial polarization between subgrain boundaries was substantiated by impedance analysis. The abundant weakly trapped electrons and more polarized interfaces formed by grain and subgrain boundaries are the primary sources of the excellent dielectric properties of composite ceramics.
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MATERIALS & DESIGN
·
2023
·
IF 8.4
Chenjuan Xiao,Yukun Yan,Guodong Wen,Yangtao Zhou,Duo Na,Chengling Yang,Jinsong Zhang
This work developed a simple and mild strategy for controllable synthesis of highly and homogeneously distributed TiO 2 nanoparticles on a cellulose template via tuning the cellulose crystallinity. As the crystallinity of cellulose increases, the restriction from crystallinity on nanoparticles increases, leading to homogeneous distribution, a decrease in size, and structural changes of TiO 2 from crystalline to amorphous. The carboxyl groups grafted on the periodically arranged hydroxyl groups of crystalline cellulose, which act as anchor sites for metal oxide precursor, restrict the distribution, growth and crystallization of TiO 2 nanoparticles. The amorphous TiO 2 nanoparticles on the cellulose with the highest degree of crystallinity (72.40 %) give the highest adsorption capacity toward tetracycline hydrochloride (152.89 mg/g), which is the state of art among the supported TiO 2 . The high adsorption capacity is proposed to be the oxygen defects caused by the Ti 3+ species, originating from the amorphous TiO 2 nanoparticles.
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Molecular Catalysis
·
2023
·
IF 4.6
Weikun Chen,Xiao Fu,Xiaoying Liu,Linmin Ye,Youzhu Yuan
N -alkylated piperazines can be synthesized by the thermal catalytic alkylation of piperazine with alkyl halides or alcohols in the presence of supported metal catalysts. However, these processes either discharge large amounts of waste or require harsh conditions. Here, we report the results of N -alkylation of piperazine with lower alcohols (methanol, ethanol, and propanol) without external hydrogen addition at room temperature in the presence of a TiO 2 -supported Pd catalyst (Pd/TiO 2 -P) prepared by photodeposition method. Compared with the catalysts prepared by the conventional chemical reduction or hydrogen reduction, the Pd/TiO 2 -P catalyst showed the highest conversion of piperazine and the best selectivity to N -alkypiperazines. The mechanistic studies indicated that this phenomenon occurs via tandem photocatalytic reactions involving alcohol dehydrgenation to aldehyde, aldehyde condensation with piperazine to enamine, and enamine hydrogenation to N -alkylated piperazines. Considering the experimental results of methanol isotope kinetics, the α-C–H cleavage of methanol to form hydroxymethyl radical (·CH 2 OH) was proven to be the rate-determining step in the N -alkylation reaction of piperazine with low carbon alcohols. The characterization and control experiments revealed that the size of Pd nanoparticles and the valence of Pd species were vital to the reaction. The Pd/TiO 2 -P catalyst with an average of 2.5 ± 0.5 nm Pd particles and approximately 68% Pd 0 species on surfaces presented the highest activity for the photocatalytic tandem reactions of methanol dehydrogenation and enamine hydrogenation.
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Coatings
·
2023
·Vol. 13
·期 12
·2071
·
IF 3.4
Ruijuan Sang,Fei Yang
Calcium carbonate (CaCO3) is a widely used inorganic filling pigment used in coatings, and it is known for its nontoxicity, odorlessness, and environmental friendliness. The application of CaCO3as a filler can effectively reduce raw material costs, and optimization of the filler formula enhances the coating film performance. In this study, oak planks were prepared as substrates for water-based inkjet printing. Three composite water-based primers with different TiO2-to-CaCO3ratios and a polyurethane resin primer were used to prepare the substrate for the printing surface. The properties of the water-based primer coating and the water-based inkjet printing coating were characterized and analyzed via Fourier-transform infrared spectroscopy, video-based contact angle analysis, and environmental scanning electron microscopy. The aim was to investigate the effects of the composite waterborne primer coatings on the ink absorption and coloring properties of the interface between wood substrates and waterborne inkjet coatings. Sample WDCC-3#, with a TiO2-to-CaCO3ratio of 15:35, exhibited the most comprehensive characteristics. The wood surface coated with 15 g/m2of the polyurethane resin primer and 15 g/m2of WDCC-3#exhibited a 5.8° contact angle of the water-based ink, first-grade adhesion, 4 H hardness, 70.52 whiteness value, and a roughness of ~2.33. The surface of the printed water-based inkjet-coated substrate was uniform and smooth, featuring rounded and transparent edges of the water-based ink droplets and a small CMYK color difference value. Therefore, the composite waterborne primer, incorporating TiO2and CaCO3in specific ratios, can be effectively combined with waterborne polyurethane primer coatings. This combination significantly improves the interfacial compatibility between the oak surface and waterborne inkjet coatings, leading to enhanced ink absorption on the oak plank surface during printing. This results in a high degree of color reproduction and clearer printed images. Overall, this study provides valuable insights for the development of primer programs for the industrial application of waterborne digital inkjet technology on wood products.Keywords:waterborne primer;calcium carbonate;water-based ink;oak plank;inkjet printing technology
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