CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Li Li,Xinhong Chen,Xia Xiong,Xiaoping Wu,Zinan Xie,Zuohua Liu
The development of a simple and environmentally friendly method to synthesize hollow TiO 2 structures is urgent for realizing high NIR reflectance and low thermal conductivity . Hollow TiO 2 @SiO 2 structures have been successfully synthesized by a recycling template method. The synthesis process involves four steps as follows: 1) preparation of SiO 2 spheres, 2) synthesis of SiO 2 @TiO 2 core-shell structure by coating mesoporous TiO 2 shell on SiO 2 and crystallization by calcination , 3) etching the SiO 2 @TiO 2 to form the hollow TiO 2 spheres, and 4) coating the hollow TiO 2 spheres with a SiO 2 protection layer to produce hollow TiO 2 @SiO 2 structures. The SiO 2 serves as a template to support and synthesize hollow TiO 2 shell, and then after being etched, to form a Na 2 SiO 3 solution as a coating agent to protect TiO 2 shell from photocatalytic activity. The as-synthesized hollow TiO 2 @SiO 2 structures not only have high NIR reflectance, but also have a high thermal barrier performance due to the hollow structure. Moreover, the NIR reflectance of the coating made from hollow TiO 2 @SiO 2 reached 94.9%, and the temperature of the inner surface of the coating board is reduced about 16 °C, compared with the surface without coating. The weather resistance studies reveal that the hollow TiO 2 @SiO 2 sample is very stable under the UV irradiation. In particular, the hollow TiO 2 @SiO 2 structures synthesized by using this method shows multifunctional responses towards solar heat.
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BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Tong Wang,Zhihao Cao,Haoxi Ben,Tao Zhao,Xiaoli Yang,Wei Jiang
Developing low-impact, energy-efficient pretreatment technologies is crucial for transitioning the bast fiber manufacturing toward cleaner textile production. This study introduces a hybrid pretreatment method that integrates visible-light-activated photocatalysis using TiO 2 /carbon quantum dots (TiO 2 /CQDs) with pectinase-assisted enzymatic hydrolysis to remove non-cellulosic gums from industrial hemp fibers. Operating at 30 °C and neutral pH, the system achieved 73.75 % lignin and 70.6 % pectin removal without compromising cellulose crystallinity or mechanical integrity. Morphological and spectroscopic analyses revealed effective disintegration of the amorphous matrix and exposure of clean fiber bundles. Mechanistic investigations confirmed the generation of reactive oxygen species (•O 2 − and h + ) under visible light, enabling selective delignification, while pectinase hydrolyzed polysaccharide binders, demonstrating synergistic enhancement of pretreatment efficiency compared to individual treatments. Preliminary energy consumption estimates indicate a 40–60 % reduction compared to conventional alkali-based processes. In addition, this alkali-free method could minimize wastewater generation. Hence, the proposed system offers a technically viable and environmentally preferable pathway toward clean and decentralized fiber manufacturing.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Youxu Yu,Yuxin Liu,Zhefei Pan,Liang An,Rong Chen
The performance of a dual-photoelectrode photoelectrochemical cell highly depends on cell configuration. Conventional opposite configuration usually requires bilateral illumination at both the photoelectrodes, while the parallel configuration has a large mass transfer resistance between the two ends of the photoelectrodes. Herein, a dual-photoelectrode photoelectrochemical cell with an opposite configuration is developed, in which a high-transmittance mesoporous TiO 2 photoanode and an air-breathing Cu 2 O-CuO nanowires photocathode are adopted. The mesoporous TiO 2 photoanode can absorb incident UV light for photoanodic reactions, and its high transmittance allows for substantial visible light to pass through the photoanode to illuminate the photocathode for reduction reactions. This design not only enables unilateral illumination to the photoelectrochemical cell with an opposite configuration and spectral splitting of sunlight utilization but also enhances light harvesting. Due to these merits, the dual-photoelectrode photoelectrochemical cell with a mesoporous TiO 2 photoanode exhibits an increase in the short current density by 78.6 % and an increase in the maximum power density by 8.1 % compared to the one with the nanoparticles-packed TiO 2 photoanode.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Wenbin Huang,Ningran Hou,Han Yang,Zhen Xu,Tianyu Bai,Fan Shao,Yasong Zhou,Qiang Wei
Series g-C 3 N 4 /Cu/B-TiO 2 (x) composites with different mass ratio of g-C 3 N 4 to Cu/B-TiO 2 were prepared and tested for photocatalytic reduction of CO 2 . The structure–function relationship of the photocatalysts was investigated through various characterization methods and photocatalytic experiments. The results show that g-C 3 N 4 can be uniformly distributed on the surface of Cu/B-TiO 2 and formed a stable heterojunction structure, which effectively reduced the band gap width of the catalyst, thus significantly improving the visible light absorption capacity of the catalyst. The modulation of the composite material properties can be realized by regulating the composite ratio of g-C3N4 and Cu/B-TiO 2 . The rate and selectivity of photocatalytic reduction of CO 2 to produce CO reached the maximum when the mass ratio of g-C 3 N 4 to Cu/B-TiO 2 was 3:7, and the rate of CO production was as high as 32.65 μmol∙g −1 ∙h −1 , which was about 12.87 percentage points higher than that of Cu/B-TiO 2 .
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guanzheng Wang,Zhong Liu,Wenjiang He,Zhentao Yuan,Lu Li,Zhaolin Zhan,Xiao Wang
Despite the advantages of TiO 2 , such as its low cost, long lifespan, and excellent thermodynamic/kinetic properties, its inherent slow ion diffusion limits its commercial application. Therefore, in this work, a three-dimensional(3D) mesoporous rutile TiO 2 hollow sphere suitable for high-energy-density pseudocapacitance and rapid lithium storage was meticulously designed. The average diameter of the hollow spheres is approximately 1.6 μm, with individual mesoporous-spheres assembled from 50 to 300 nm nanoparticles, and the hollow spheres exhibit a high specific surface area of ~58.57 m 2 g −1 and a large pore size of ~14.18 nm. The results demonstrate that the electrochemical performance of 3D rutile TiO 2 hollow sphere samples is superior to that of conventional microsized particles. Specifically, the MS-TiO 2 –2 sample retained a high capacity of 295 mAh g −1 after 100 cycles at 0.5C. After 1000 cycles at 1C and 5C, the reversible specific capacities of MS-TiO 2 –2 were 254 and 174 mAh g −1 , respectively. Its pseudocapacitive contribution reached as high as 82 % under a fast cyclic voltammetry scan at 10 mV s −1 . These excellent electrochemical properties are attributed to the unique design and regulation of the three-dimensional mesoporous structure. The precise control of porosity is the primary reason for the optimal electrochemical performance of MS-TiO 2 –2. This anode with the 3D mesoporous structure enables rapid Li + transport, which is of great significance for the design of high-energy-density pseudocapacitors and fast Li + batteries.
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DESALINATION
·
2025
·
IF 9.8
Guiqun Liu,Qisheng Ma,Zheng Li,Jialong Zhang,Kuan Lei,Ding Li,Min Xue,Wenli Wu,Jianghua Du,Xiaoli Zhang
Solar photothermal interfaces garner widespread attention as an economical and efficient water purification technology, particularly in applications such as seawater desalination and wastewater treatment. However, their relatively limited capacity to degrade organic pollutants in real wastewater, especially in addressing eutrophic water bodies commonly encountered in daily life, hinders their broader practical deployment. Herein, we synthesize a novel bifunctional hydrogel material, PSTCC (PAM/SA/TiO 2 -CQDs/CNTs), which integrates both photothermal and photocatalytic functionalities. We also design and fabricate a 3D structured hydrogel device to systematically evaluate its potential for eutrophic water purification. By incorporating carbon quantum dot - modified TiO 2 and carbon nanotubes into a polyacrylamide–sodium alginate composite matrix, the hydrogel exhibits significantly enhanced photothermal conversion efficiency while effectively tuning the bandgap of TiO 2 , thereby improving its photocatalytic activity. Furthermore, using a 3D structured mold and demolding process, we construct a PSTCC hydrogel evaporator featuring surface convex protrusions and vertically aligned internal capillary channels, which achieves a high evaporation rate of 2.56 kg m −2 h −1 under one sun irradiation. The device also demonstrates excellent performance in the removal of organic pollutants, achieving a photocatalytic degradation efficiency of 85.5 % for methylene blue and an inactivation rate of 58.7 % for Chlorella vulgaris . This evaporator and its associated device are expected to offer a novel paradigm for treating typical organic pollutants in eutrophic water bodies, holding broad application prospects in the field of green, efficient, and energy-saving water treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shanhui Zhu,Ruiqi Wu,Xiaoming Li,Mei Dong,Weibin Fan
Reductive amination of carbonyl compounds such as biomass-based furfural to valuable primary amines is of great importance. However, it often suffers from low efficiency and moderate amine yield. In this work, Ru-loaded TiO 2 nanosheets (NS) enabled stable and efficient conversion of furfural to furfurylamine (FAN), with 97.0 % yield and very low apparent activation energy (20.3 kJ/mol). XPS, EPR and Raman spectra reveal presence of abundant interfacial oxygen vacancies on Ru/TiO 2 -NS, and the intrinsic activity of various Ru/TiO 2 linearly increased with their oxygen vacancy concentration. DFT calculation confirms that oxygen vacancies induce to generate coordinatively unsaturated Ru species, which enhances activation of key intermediate imine. The activation energy of FCH 2 NH (F, furan group) hydrogenation to FAN has been remarkably decreased from 1.07 eV to 0.82 eV on Ru/TiO 2 -NS. Our results illustrate the potential of utilizing interfacial oxygen vacancy sites in enhancement of reaction performance for biomass amination.
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Journal of Food Measurement and Characterization
·
2025
·
IF 3.3
Zeng Liping,Yang Ruopeng,Deng Qiuhong,Hu Chunyuan,Tian Ruijin,Yang Guangming,Liu Sha,Fan Aiping
This study successfully prepared polylactic acid (PLA) composite films containing Litsea cubeba oil (LCO, 9 wt%) and different concentrations of nano-TiO 2 (0 wt%, 1 wt%, 2 wt%, and 3 wt%), and evaluated their efficacy in preserving fresh-cut jackfruit. The results showed that LCO and nano-TiO 2 could be successfully incorporated into the PLA matrix, which improved the composite films’ structure, flexibility, water and UV resistance, and antioxidant and antimicrobial activities. Notably, the composite film with 2 wt% nano-TiO 2 content exhibited the best overall performance among all the packaging materials. Experiments on fresh-cut jackfruit preservation revealed that the composite films suppressed the proliferation of microorganisms like total bacterial count, mold and yeast, and to varying degrees, inhibited their growth and slowed down the quality deterioration of fresh-cut jackfruit. In addition, composite film with 2 wt% nano-TiO 2 content was the most effective in inhibiting microorganisms, respiratory rate, enzyme activity, and malondialdehyde (MDA) content as well as in maintaining weight loss, color, firmness, flavor, and vitamin C (VC) content, ultimately extended the shelf-life of fresh-cut jackfruit from 6 to 15 days at 10 °C. This work demonstrates the feasibility of bioactive PLA films as safe antimicrobial packaging for tropical fruits.
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SCRIPTA MATERIALIA
·
2025
·
IF 5.6
Yilong Yang,Xuan Ge,Jianguo Li,Qiaodan Hu
Extreme solidification processes in advanced manufacturing (e.g., laser additive manufacturing and in space fabrication) amplify challenges in predicting phase selection under severe thermodynamic non-equilibrium. Using aerodynamic levitation containerless processing, we investigate the solidification behavior of pseudo-binary MgTiO 3 -TiO 2 system. Our experiments reveal an anomalous trans-phase-regime selection phenomenon in which the thermodynamically stable MgTi 2 O 5 phase is kinetically suppressed from precipitation. This selection arises from nucleation kinetic barriers of MgTi 2 O 5 , where coupled undercooling and compositional fluctuations destabilize critical nuclei formation. By integrating composition- and temperature-dependent interfacial energy dynamics into classical nucleation theory , we develop a predictive framework that quantitatively maps anomalous phase selection regions. This approach establishes the first non-equilibrium kinetic phase diagram of this system with experimental validation, resolving long-standing discrepancies between equilibrium predictions and non-equilibrium experimental outcomes. The proposed methodology establishes a generalized paradigm for phase selection prediction, offering transformative insights into microstructure and phase control under extreme non-equilibrium solidification conditions.
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CATALYSIS LETTERS
·
2019
·Vol. 149
·期 7
·2004-2014
·
IF 2.372
Wang Jian,Zhao Hainan,Liu Xiaolong,Xu Wenqing,Guo Yangyang,Song Jianfei,Zhu Tingyu
In this work, we presented a detailed evaluation of Ru/TiO 2 (P25) catalysts for the catalytic oxidation of (chloro)-aromatics. The model catalysts were synthesized through wet impregnation. Catalytic evaluations, as well as ICP, BET, XRD and TEM analyses, were conducted. The results indicated that RuO 2 tended to be distributed on the rutile phase of TiO 2 , leading to an inhomogeneous distribution. These Ru/TiO 2 catalysts were very active, especially for chlorobenzene oxidation. The conversions of benzene and chlorobenzene were both suppressed by the introduction of additional water. But the amount of polychlorinated benzenes as by-products was also reduced. However, the activity of the catalyst significantly decreased with an increase in calcination temperature, suggesting that the thermal stability of the catalyst still needed to be improved. Graphical Abstract
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Molecular Catalysis
·
2023
·
IF 4.6
Dou Zhang,Bo-hui Li,Yi-lei Li,Jun Zhao,Xiao-jing Wang,Fa-tang Li
The efficient conversion of CO 2 to carbon-neural fuels by photocatalysts can effectively address the increasingly prominent challenges of environmental pollution and energy shortage. TiO 2 is considered a promising photocatalyst. However, its disadvantages, such as poor adsorption of CO 2 and low carrier separation efficiency, inhibit its performance and selectivity in photocatalytic CO 2 reduction. Herein, K + -modified anatase TiO 2 ultrathin nanosheet photocatalysts were obtained via a reverse etching method using K 2 Ti 8 O 17 as the precursor. The selectivity of the optimized photocatalyst for methane was 96.02% in a gas–solid system without additives, with an excellent photocatalytic rate of 42.3 μmol·g −1 ·h −1 , which was 3.39 times higher than that of P25. The effects of K + on photocatalytic behaviors and the selectivity of CH 4 was systematically investigated. The test results showed that during treatment with formic acid, a large amount of K + from the layered K 2 Ti 8 O 17 were removed and the original structure was destroyed. Therefore, highly dispersed TiO 2 nanosheets were obtained, with a small amount of K + remaining on the TiO 2 surface. The well-defined rectangular shapes of TiO 2 reduce the transmission distance of photogenerated carriers, whereas the presence of K + increase the chemisorption of CO 2 molecules, thereby activating CO 2 , promoting the conversion of bridge *CO to -CHO, and increasing CH 4 production. This study provides insightful references for the preparation and modification of traditional photocatalysts for photocatalytic CO 2 reduction reactions.
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Catalysis Science & Technology
·
2018
·Vol. 8
·期 15
·3876-3882
·
IF 5.365
Xiaogang Liu,Yingpu Bi
Ti3+-doped TiO2 nanosheets with different percentages of exposed {001} facets were synthesized by aluminium (Al) reduction. The structure, crystallinity, morphology, and other properties of the as-prepared samples were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. Electron paramagnetic resonance spectra confirm the presence of paramagnetic Ti3+ species in the prepared Ti3+-doped TiO2. Under UV-visible light irradiation, all the Al-reduced TiO2 nanosheet samples exhibit higher photocatalytic hydrogen evolution, degradation of methyl orange (MO) and photoelectrochemical (PEC) performance than the non-reduced ones. The Al-TiO2-HF6 sample with the highest Ti3+ concentration and optimal exposed {001} facets exhibits the most excellent photoreactivity, which is mainly ascribed to the efficient transport and separation of photo-induced charge carriers resulting from the synergistic effects between Ti3+ doping and facet regulation.
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