JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yutao Shan,Chen Chen,Ying Liang,Yuliang Chen,Yuliang Wu,Yijiang Liu,Rui Meng,Wenmin Wang,Weiwei Huang,Fei Yang,Xuesong Yi,Jun Cheng
To investigate the photocatalytic synergistic effect and efficiency of composites of iron sulfide (Fe 3 S 4 ) and titanium dioxide (TiO 2 ) after modification with cetyltrimethylammonium bromide (CTAB), this study employed commercial TiO 2 nanoparticles, ferric chloride hexahydrate, and thiourea as precursors to synthesize the catalyst. CTAB was incorporated into the precursors for modification and optimization. A simple one-step solvothermal method was utilized to prepare TiO 2 @Fe 3 S 4 photocatalysts with different CTAB loadings. After modifying the TiO 2 @Fe 3 S 4 photocatalyst with CTAB, its photocatalytic degradation performance for Rhodamine B and sulfamethoxazole was significantly enhanced, the reaction rate constant for its degradation of RhB, calculated using a pseudo-first-order reaction kinetic model, is 0.2187(min −1 ). By guiding the well-distributed construction of semiconductor heterojunctions in Fe 3 S 4 through CTAB in the reaction atmosphere, the spatial uniformity of the heterojunction structure was strengthened. This improvement enhanced the separation capability of photogenerated electrons and holes without compromising their redox properties, thereby exhibiting excellent catalytic efficiency in the degradation of organic pollutants.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jiaqi Yan,Jingxuan Zhao,Jing Guo,Zhiyong Yang,Mingjun Xiong,Langsheng Pan,Yongfei Li
The self-aldol condensation of cyclopentanone (CP) to aviation fuel precursors was studied over various acid-base bifunctional TiO 2 -based catalysts. Combining TiO 2 and SnO 2 improved the catalytic performance and reduced the apparent activation energy, resulting in a selectivity of 97.5 % for 2-cyclopentylidene cyclopentanone (dimer C 10 ) and 2,5-dicyclopentylidene cyclopentanone (trimer C 15 ) (with 79.2 % yield for dimer C 10 ) at a CP conversion of 92.5 %. Response surface methodology (RSM) analysis of the reaction parameters showed that the actual results were in considerable concordance with the predicted ones. The excellent catalytic performance and stability exhibited by the TiO 2 -SnO 2 nanocomposites catalyst were attributed to (i) the nanoscale mixed metal oxide grains (bonded by Ti–O–Sn) and highly dispersed active Ti δ+ species, which facilitated the adsorption and activation of CP; (ii) the increase in surface O C species contributing to the abundance of hydroxyl groups (including M δ+ –O – pairs), which promoted the formation of the enolate intermediates; (iii) the construction of appropriate medium acid-base sites and the Brønsted/Lewis acid sites (BAS/LAS) ratio, which favored the formation of the desired dimer C 10 . Conversely, the TiO 2 -SiO 2 catalyst with plentiful strong acid-base sites induced the successive condensation of CP, which favored the formation of trimer C 15 . Furthermore, a plausible reaction mechanism for the catalytic self-aldol condensation of CP over the TiO 2 -SnO 2 catalyst was proposed. This study developed an efficient and stable TiO 2 -SnO 2 catalyst for CP self-aldol condensation with promising application potential.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhi-Wei Zheng,Shi-Ying He,Zhan-Yuan Huang,Yi-Wei Wang,Xiao-Fei Zhang,Lang-Xi Ou,David Wei Zhang,Hong-Xiu Yu,Hong-Liang Lu
The TiO 2 /SnO 2 core-shell nanowires (NWs) with precisely controlled SnO 2 shell thickness were successfully synthesized via facile hydrothermal method and atomic layer deposition (ALD) process. The innovative approach of integrating ALD with hydrothermal synthesis allowed for the precise tuning of the SnO 2 shell thickness, which is critical for optimizing gas sensing performance. The sensing performance of the prepared sensor was found to be highly dependent on the SnO 2 shell thickness. Notably, the sensor with a 20 nm SnO 2 shell exhibited the highest response (R a /R g ) of 5.9 towards 5 ppm H 2 S at 300 °C, which was approximately three times higher than that of the pristine TiO 2 NWs sensor (∼1.8). This significant enhancement in H 2 S sensing performance can be attributed to the formation of the TiO 2 /SnO 2 heterojunction and the optimal SnO 2 shell thickness, which were further elucidated through chemisorbed oxygen model, heterojunction depletion theory, and bandgap alignment. Additionally, the sensor demonstrated low power consumption (∼100 mW), great selectivity towards H 2 S, fast response/recovery times (25 s and 173 s, respectively), the ability to detect H 2 S at low concentrations (200 ppb), high sensitivity, excellent repeatability and remarkable stability (over 10 months). Therefore, the proposed MEMS-based TiO 2 /SnO 2 core-shell NWs gas sensor provides a promising approach for industrial and environmental monitoring applications.
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CATALYSIS LETTERS
·
2024
·
IF 2.3
Hu Jingru,Jiang Minjun,Hu Bingwen,Cheng Gang
Remediation of antibiotics by photocatalysis technique has been regarded as a promising route to tackle with the environmental pollution affecting human survival and development. In this work, brookite TiO 2 nanorods with different oxygen vacancy have been synthesized through tailoring the volume of ethylene glycol by hydrothermally treatment with NaTiOx-nanoassembly. After constitute and morphology confirmation with different characterizations, their photocatalytic performances are evaluated via ciprofloxacin (CIP) antibiotic degradation experiments. The result shows that the TiO 2 -0 has the highest photocatalytic efficiency towards CIP degradation, comparing with TiO 2 -15 and TiO 2 -30 samples. Although the TiO 2 -30 has high concentration oxygen vacancy, it exhibits excellent adsorption ability in the dark, rather than CIP degradation rate. The photo/electrochemical tests suggest the photo-generated electron lifetime, charge transfer ability, and the effective active sites on the material’s surface are inversely proportional to the concentration of oxygen vacancies. It also concludes that rational fabrication conditions tailoring of the photocatalyst could optimize the corresponding capability in the antibiotic degradation process. In addition, the possible degradation pathway is also proposed based on the high resolution mass spectrometry (HRMS), and the acute toxicity changes in the degradation process are also predicted. Graphical Abstract
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tengfei Wang,Qing Pang,Boyu Liu,Hongyu Wang
Titanium dioxide (TiO 2 ), once considered a promising material for microwave absorption, still faces significant challenges in achieving broadband absorption performance. To address this issue, herein, a simple approach is reported for successfully introducing defects and crystalline/amorphous heterostructures onto mesoporous TiO 2 (Meso-am-TiO 2-x ). This study demonstrates the superior microwave absorbing properties of Meso-am-TiO 2-x , particularly in the low-frequency range. A reflection loss of up to −25.7 dB is achieved with a thickness of 4.6 mm, and the effective absorption bandwidth (EAB) value extends to 4.32 GHz. The experimental results indicate that the synergistic effects of the high specific surface area of mesoporous TiO 2 , defects-induced conduction loss, defect-induced dipole polarization loss, and interfacial polarization loss between the crystalline and amorphous heterostructures enhance the microwave absorption properties of Meso-am-TiO 2-x . This study provides insights toward developing innovative low-frequency broadband TiO 2 absorbers.
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Catalysts
·
2025
·Vol. 15
·期 8
·739
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IF 4
Xiao Ge,Hongrui Ding,Tong Liu,Yifei Du,Anhuai Lu
Photocatalytic redox processes significantly contribute to shaping Earth’s surface environment. Semiconductor minerals exhibiting favorable photocatalytic properties are ubiquitous on rock and soil surfaces. However, the sunlight-responsive characteristics and functions of TiO2, an excellent photocatalytic material, within natural systems remain incompletely understood, largely due to its wide bandgap limiting solar radiation absorption. This study analyzed surface coating samples, determining their elemental composition, distribution, and mineralogy. The analysis revealed enrichment of anatase TiO2and β-carotene. Informed by these observations, laboratory simulations were designed to investigate the synergistic effect of β-carotene on the sunlight-responsive behavior of anatase. Results demonstrate that β-carotene-sensitized anatase exhibited a 64.4% to 66.1% increase in photocurrent compared to pure anatase. β-carotene sensitization significantly enhanced anatase’s electrochemical activity, promoting rapid electron transfer. Furthermore, it improved interfacial properties and acted as a photosensitizer, boosting photo-response characteristics. The sensitized anatase displayed a distinct absorption peak within the 425–550 nm range, with visible light absorption increasing by approximately 17.75%. This study elucidates the synergistic mechanism enhancing the sunlight response between anatase and β-carotene in natural systems and its broader environmental implications, providing new insights for research on photocatalytic redox processes within Earth’s critical zone.
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DYES AND PIGMENTS
·
2025
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IF 4.2
Yu Sun,Lirong Chen,Mengyang Lv,Yufei Hu,Zhenchao Gu
The interconnection between dye molecules and TiO 2 through a bridging substance has been demonstrated as an effective method to optimize the transport pathway of photogenerated electrons while enhancing the structural stability of composite systems. However, there are currently no established guidelines for the selection of bridging substances, which affects the expression of the photocatalytic performance of composite materials. In this study, a series of bridging substances containing carboxyl and hydroxyl groups were used for the preparation of carboxylate dye-sensitized TiO 2 . The performance of the composite photocatalysts was analyzed through photocatalytic degradation experiments and various characterization techniques. The results indicate that the relative position of the substituents affects the electron distribution within the benzene ring, thereby influencing the electron transfer process through the bridging substance. Increasing the length of the bridging substance has a negative impact on photocatalytic performance, leading to a significant decline in various properties. The addition of too little or too much bridging substance prevents the full utilization of its catalytic potential. Finally, meta-hydroxybenzoic acid demonstrated the best auxiliary capability among ortho-hydroxybenzoic acid, meta-hydroxybenzoic acid, para-hydroxybenzoic acid, para-hydroxyphenylacetic acid, and 3-(4-hydroxyphenyl) propanoic acid.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Ni-Jie Liu,Jun-Yan Yu,Xing-Yu Chen,Li-Fen Liu
Organic solvent ultrafiltration (OSU) membrane as the crucial supporting layer of thin-film composite (TFC) organic solvent nanofiltration (OSN) membrane can help the OSN technology to satisfy the rapidly growing demand for small-molecular separation and purification in organic solvent systems. Aiming at the two main bottlenecks of poor tolerance to strong polar solvents and low solvent flux of the conventional commercial polyimide (PI) ultrafiltration (UF) membrane, in this study, a facile method was proposed to prepare a novel polyimide/polyethyleneimine@TiO2 (PI/PEI@TiO2) OSU membrane with improved solvent resistance and permeability by synchronously coupling the non-solvent-induced phase transformation (NIPs), chemical crosslinking and interfacial in-situ biomineralization. Dut to the chemical crosslinking between PEI and PI, the PI/PEI@TiO2 membrane exhibited good resistance to more organic solvents including the strong polar aprotic solvents (e.g., DMF, NMP and DMSO), ordinary polar solvents (e.g., ethanol) and nonpolar solvents (e.g., n-hexane). At the same time, PEI synchronously catalyzed Ti-BALDH to in-situ generate the TiO2 nanoparticles via interfacial biomineralization, which improved the solvent flux of the PI/PEI@TiO2 membrane due to the creation of more channels and promoted the compatibility of TiO2 within PI/PEI matrix. Especially, the PI/PEI@TiO2-5 membrane with 5 wt% TiO2 loading showed the optimal solvent resistance and high flux in strong polar aprotic solvents (>50 L m−2 h−1·bar −1 in DMF). Therefore, the resultant new PI/PEI@TiO 2 OSU membrane will have a promising separation application in the organic solvent systems in the future.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Chengyin Lin,Yongyuan Deng,Yuankai Lin,Jun Li,Junling Tu,Riyang Shu
Hydrodeoxygenation (HDO) represents a highly efficient refining pathway to convert lignin-derived phenolic compounds for the production of hydrocarbon fuels, and the selection of a suitable catalyst is pivotal for a high reaction efficiency. In this study, we introduce a novel highly dispersed Pt/Al2O3–TiO2 composite catalyst that is prepared via a photochemical reduction method and employ it for the HDO of lignin-derived phenolic compounds. The catalyst demonstrates a good HDO performance, achieving complete conversion of guaiacol at 260 °C with cyclohexane selectivity of 99.9%. Catalyst characterization results reveal that the Pt/Al2O3–TiO2 catalyst exhibits a high Pt metal dispersion. Besides, the composite support synergistically combines the properties of Al2O3 and TiO2 components, resulting in a high specific surface area, moderate acidity, and abundant oxygen vacancy. These factors facilitate the provision of numerous active metal sites and acid sites those are essential for the HDO reaction. Moreover, the Pt/Al2O3–TiO2 catalyst also shows a high activity on the HDO of various other phenolic compounds. When applied to the upgrading of lignin oil, the catalyst significantly increases the hydrocarbon content from 18.9% to 92.2%, concurrently reducing the oxygen content and substantially increasing the hydrogen content of the lignin oil. The calorific value is significantly enhanced, underscoring the potential of the Pt/Al2O3–TiO2 composite catalyst to upgrade lignin-derived phenolic compounds into high-quality hydrocarbon liquid fuels.
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BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Yu Wang,Hua Fan,Po Keung Wong,Yonghong Wu,Bruce Rittmann
To develop a more green and effective method for tetracycline (TC) removal, a hybrid material (conversion phosphors-TiO 2 , UCPs-TiO 2 ) was coupled with a biofilm to achieve enhanced removal of TC. The removal of TC by biofilm coupled with UCPs-TiO 2 under visible light reached 82%, which was 35% higher than that in treatment using only the biofilm. Extracellular polymeric substance (EPS) promoted the production of hydroxyl radicals by UCPs-TiO 2 , as the EPS acted as an electron transfer medium and accelerated the TC mineralization. Biofilm in the coupled system tolerated TC stress by regulating its antibiotic resistance genes (ARG) and superoxide dismutase (SOD), and allowed it to maintain stable and efficient removal of TC. This study documents a method to couple a hybrid material with microbial aggregates, creating a promising system for removing refractory organics, such as TC, from water. The study also offers insight into the mechanisms underlying TC removal by microbial aggregates combined with new functional materials.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Yuqin Lu,Hua Deng,Xueshan Zhang,Jianguo Ding,Sijia Bai,Lian Wang,Hong He
The inhibitory interactions among various volatile organic compounds (VOCs) during combustion in industrial exhaust gases pose a significant challenge for catalytic technologies, primarily due to a lack of effective approaches to counter these adverse effects. The interaction between Pt and TiO2 was readily tuned through hydrogen reduction of the TiO2 matrix (Pt/TiO2-800), which ultimately transformed the inhibitory effect into a synergistic effect in a toluene–acetone mixture. Optimal catalytic activity was achieved at 0.6 wt % Pt loading, with 0.6Pt/TiO2-800 lowering reaction temperatures by 21 °C for toluene and 24 °C for acetone in mixed VOC oxidation. Characterization reveals that Pt/TiO2-800 possesses abundant oxygen vacancy clusters, enhancing TiO2-Pt electron transfer, diversifying Pt nanoparticle sizes, stabilizing low-valent Pt species, and improving oxidative capacity. DFT calculations further underscore the role of oxygen vacancy in modulating the Pt electronic environment and enhancing defect-enhanced adsorption. This work advances Pt-TiO2 interaction understanding and offers an effective catalyst for VOCs abatement, addressing inhibitory effects in mixed VOCs systems.
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NANO
·
2025
·
IF 1.1
Yi Gou,Jinghong Du,Zilong Wang,Shengyang He,Jiahao Lv
La 3+ single-doped and La 3+ -Mo 6+ co-doped TiO 2 nanotubes were synthesized via anodic oxidation combined with a two-step electrochemical process. Their crystalline structure, microstructure, and light absorption properties were characterized using XRD, SEM, and UV-Vis spectroscopy, followed by methylene blue photocatalytic degradation experiments. The results indicate that both La 3+ single-doping and La 3+ -Mo 6+ co-doping can suppress the transformation of the anatase phase to the rutile phase and inhibit grain growth. The diameters of both types of nanotubes range between 60-80 nm, with La and Mo uniformly distributed throughout the nanotubes. Both La 3+ single-doped and La 3+ -Mo 6+ co-doped induced red shifts in the TiO 2 light absorption peaks. The most pronounced red shift in the light absorption band edges occurred at a La 3+ -Mo 6+ ratio of 3:7, reducing the bandgap width to its minimum value of 2.99 eV. Both La 3+ single-doped and La 3+ -Mo 6+ co-doped TiO 2 exhibited first-order photocatalytic degradation of methylene blue. As the La 3+ single-doped concentration increased or the La 3+ -Mo 6+ co-doped ratio varied from 1:9 to 9:1, both the methylene blue degradation rate and photocatalytic reaction rate initially increased before decreasing, while the half-life initially decreased before increasing. At a La 3+ -Mo 6+ co-doped ratio of 3:7, the photocatalytic activity of the TiO 2 nanotubes was optimal, achieving a maximum degradation rate of 89.73% within 8 hours-a 52% improvement over pure TiO 2 nanotubes.
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