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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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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DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 9
·683
·
IF 4.3
Hairui Cai,Benjamin Yang,Jie Hou,Ziqi Wang,Zhuo Li
Formaldehyde, a pervasive indoor air pollutant posing significant health risks, has driven extensive research into advanced mitigation strategies to ensure safer living environments. Herein, this study presents a synthesis method for the large-scale production of hydrogenated TiO2(P25) loaded with PtAu nanoalloys (P25(H)-PtAu), using a combination of ball milling and high-temperature annealing. Hydrogenation-induced defect-rich TiO2efficiently improves visible light absorption, enhancing the utilization of visible light in photocatalytic reactions. Mechanochemical ball milling was employed to prepare ultrasmall PtAu nanoalloys with a size of 3.7 ± 0.1 nm, which were uniformly dispersed on the surface of P25(H). Density functional theory (DFT) results indicate that PtAu nanoalloys synergistically enhance charge separation via Schottky junctions and surface reaction kinetics by optimizing reactant adsorption. As a result, P25(H)-PtAu achieves industrially relevant formaldehyde removal efficiency (97.8%) under ambient light conditions while maintaining scalability (10 g batches). This work provides a scalable framework for developing manufacturable photocatalysts, with immediate applications in heating, ventilation and air conditioning systems, and air purifiers.
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Xiang Hongliang,Chen Xiaoyu,Huang Ye,Wu Chaochao,Mou Gang,Zheng Kaikui
This study investigated the fabrication of a strengthened Ti-TiO 2 material with adding 0.5 wt.% TiO 2 nanoparticles via selective laser melting process in comparison with CP-Ti. Through the process parameters optimized by response surface methodology, the Ti-TiO 2 material fabricated by SLM showed remarkable tensile strength of 800.6 MPa and elongation of 14%, as compared to the fabricated CP-Ti with tensile strength of 594.0 MPa and elongation of 21%. The x-ray diffraction patterns of fabricated specimens showed the expansion of the hcp -Ti lattice along the c -axis due to dissolved oxygen atoms from the decomposition of TiO 2 nanoparticles. The microstructure analysis observed remains of incompletely decomposed TiO 2 and TiO phases in SLMed Ti-TiO 2 material, which was distinguished from former studies. Consequently, the decomposition behavior of added TiO 2 nanoparticles associated with the dissolved oxygen in the Ti-matrix during the SLM process was discussed. Based on the evaluation of both the solution effect of oxygen atoms and the reinforcing effect of undecomposed nanoparticles, the dissolved oxygen from decomposed TiO 2 was considered the primary factor in the intensified strength of SLMed Ti-TiO 2 material. These results could offer novel insights into the additive manufacturing of high-strength and biocompatible titanium alloy via the SLM process.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jing Zhu,Jingyu Wang,You-Peng Chen,Taiping Qing,Peng Zhang,Bo Feng
With the increasing concerns regarding bacterial adaption to nanomaterials , it is critical to explore the main mechanism behind the adaptive morphogenesis of microorganisms . In this work, the biofilms formed from activated sludge exposed to 5 and 50 mg/L nTiO 2 in the dark had increased biomass and selectively enriched pathogens . To further elaborate adaptive mechanism of biofilm formation induced by nTiO 2 , the protein response and protein phosphorylation modification of Escherichia coli K12 were determined using integrative systems biology analyses of proteomics and phosphoproteomics. Results identified that E. coli cultivated with nTiO 2 considerably upregulated iron acquisition, and regulated protein phosphorylation states associated with of transcription and translation and biofilm formation relative to unexposed controls. Accordingly, bacteria increased siderophores and exopolysaccharide content (increased by about 57% and 231%, respectively), and enhanced resistance to transcriptional inhibitory antibiotics. Moreover, a dose of an iron chelator, i.e., deferoxamine mesylate salt, effectively retarded the biofilm development of bacteria exposed to 50 mg/L nTiO 2 . Overall, this work will provide a new insight for biofouling control, and contribute to an improved understanding of microbial adaption to nanomaterials.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2015
·
IF 3.65
Song Shen,Lin Wu,Jiejie Liu,Meng Xie,Haijun Shen,Xueyong Qi,Yongmin Yan,Yanru Ge,Yi Jin
To facilitate targeting drug delivery and combined therapy, we develop titanium dioxide-encapsulated Fe 3 O 4 nanoparticles (Fe 3 O 4 @TiO 2 NPs). Titanium dioxide (TiO 2 ), which is employed as a sonosensitizer for sonodynamic therapy (SDT), can also be used for the loading of doxorubicin (DOX). The fabricated Fe 3 O 4 @TiO 2 NPs exhibit pH-dependent loading and release of doxorubicin (DOX) in vitro. After incubation with cancer cells, reactive oxygen species (ROS) are generated efficiently upon the irradiation of ultrasound. In the biodistribution experiments, extremely high in vivo tumor accumulation of Fe 3 O 4 @TiO 2 NPs and long-time retention effect are observed. Compared with chemotherapy or sonodynamic treatment alone, the combined therapy demonstrated a synergistic effect, resulting in stronger cytotoxicity and higher therapeutic efficacy. Thus, the constructed NPs are endowed with multifunctions which allow them to selectively deliver combinatorial therapeutic payload to tumor with enhanced therapeutic effectiveness and minimal side effects.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xianglei Liu,Chuang Bao,Zhonghui Zhu,Hangbin Zheng,Chao Song,Qiao Xu
Methanol steam reforming (MSR) is considered as an effective method for hydrogen storage and generating high-quality hydrogen for fuel cells. In this work, mesoporous Cu/TiO 2 –CeO 2 catalysts are proposed to achieve efficient MSR based on synergetic effects of thermal and photon energies . Optimal Ti/Ce molar ratio is found to be 2:1, for which excellent methanol conversion of 100% and extremely low CO selectivity of 2.2% are achieved for thermal catalysis. Further applying UV light (280–400 nm) irradiation while keeping the same temperature, the hydrogen production rate is enhanced to be 78.8 mmol/h/g from 58.6 mmol/h/g. The underlying mechanism is attributed to photogenerated electron hole pairs promoting the REDOX reaction of intermediate product methyl formate based on in situ diffuse reflectance infrared fourier transform spectra (DRIFTS). This work provides a new method to enhance methanol steam reforming performance via thermo-photo synergic effects, and paves a way for the development of direct solar driven MSR techniques.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yan Wang,Shengzhe Zhao,Yi Yang,Raul D. Rodriguez,Anya Lipovka,Yun Lu,Honglan Huang,Jinju Chen
Ag nanoparticle-decorated Bi 2 O 3 -TiO 2 heterogeneous photocatalysts were successfully obtained by combining facile sacrificial templates and photoreduction . The as-synthesized Ag@Bi 2 O 3 -TiO 2 photocatalysts with a narrow band gap of 2.40 eV exhibited considerable photocatalytic activity to degrade rhodamine B (RhB) and tetracycline hydrochloride (TCH), and the removal efficiency reached 100% and 92%, respectively. Ag@Bi 2 O 3 -TiO 2 photocatalysts also exhibited stable recyclability for the degradation of RhB and TCH. Trapping experiments helped determine the major reactive oxidative species for TCH photodegradation . The desirable photodegradation performance is mainly attributed to improved light absorption , enhanced charge separation, and strong redox capacity of Ag@Bi 2 O 3 -TiO 2 nanostructures with S-scheme heterojunction . This work provides a facile avenue to construct heterogeneous tubular nanostructures with intensive photoabsorbance and effective photocatalysis to degrade organic contaminants.
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高影响因子
Coatings
·
2023
·Vol. 13
·期 2
·317
·
IF 3.4
Yan Zhang,Tianyi Sun,Dashuai Zhang,Chen Li,Jinrui Liu,Bangsen Li,Zaifeng Shi
The fact that the use of a large number of plastic products has brought serious pollution to the environment has always been the focus of global attention. The development of photocatalytic degradable plastics is one of the effective ways to solve the problem of “white pollution”. In this work, La3+modified TiO2nanoparticles were prepared by ball milling and characterized. La3+/TiO2was mixed with Polyvinyl chloride (PVC) plastic to make a photodegradable composite film, and the photodegradation performance and mechanical properties of films were evaluated. The photodegradable films were characterized by infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), and scanning electron microscopy (SEM). After 30 h UV irradiation, the weight loss rate of the PVC was only 2.12%, while that of the TiO2/PVC reached 8.94%. The accelerating of the degradation rate was due to the mixing of TiO2into PVC. As for the La3+/TiO2/PVC composite film, when the mass percentage of La3+/TiO2was 1.5%, the weight loss rate of La3+/TiO2/PVC sample reached a maximum of 17.78%, which was eight times the degradation rate of PVC and two times the degradation rate of TiO2/PVC. The La3+/TiO2/PVC film showed good photodegradability. La is a transition metal element with a special 4f electronic structure. The reaction mechanism of photodegradation of PVC by the interaction of La3+and TiO2were discussed.Keywords:La3+modified TiO2;La3+/TiO2/PVC composite film;ball milling method;photodegradation
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Journal of Coatings Technology and Research
·
2021
·Vol. 18
·期 5
·1245-1259
·
IF 2.382
Zong Lijun,Wu Yaping,Li Xingeng,Jiang Bo
In this study, superhydrophobic photocatalytic fluorosilicone/SiO 2 –TiO 2 (FSi/SiO 2 –TiO 2 ) coatings were prepared. Evolutions of wettability and photocatalytic activities were explored by exposing a series of samples to UV irradiation and the outdoor environment. Their practical self-cleaning performances were also compared. The UV-irradiation test was carried out in an ultraviolet aging test chamber. Wetting properties, including water contact angles and sliding angles, were measured using a contact angle meter. A UV spectrophotometer was employed to detect and evaluate the coatings’ photocatalytic properties. Moreover, morphologies and surface roughness values were tested through field emission scanning electron microscope and optical profilometer, respectively. It is shown from experimental results that the coating series with more TiO 2 addition amounts transform from superhydrophobic to superhydrophilic in a shorter time. The coating with a more durable superhydrophobicity can maintain its initial wettability, while its photocatalytic property is superior to that of a hydrophobic coating. Mechanisms were put forward through analyzing the coating microstructures. It is considered that the superhydrophobic coating with a Cassie–Baxter surface structure shows a better photocatalysis. Besides, it has been confirmed that the practical self-cleaning performance of the prepared superhydrophobic photocatalytic FSi/5TiO 2 –32SiO 2 coating is better in comparison with superhydrophobic FSi/SiO 2 and photoinduced superhydrophilic FSi/5TiO 2 –28SiO 2 coatings.
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Chemical Engineering and Processing-Process Intensification
·
2019
·
IF 3.031
Suqi Zhang,Jie Zhang,Jian Sun,Zhiyong Tang
A novel capillary microphotoreactor (MPR) packed with TiO 2 -coated glass beads was developed in this work and its photocatalytic performance was evaluated using degradation of methylene blue (MB) as a model reaction. As compared to conventional wall-coated MPR, the use of glass beads as packing material not only provides a larger surface area for catalyst immobilization and shortens the mass transfer route, but also introduces flow perturbation. An appropriate size of glass beads should be chosen for packing because there is a tradeoff between increased catalysts coating area and decreased light penetration. It was found out that nearly 100 % degradation efficiency could be achieved in 80# glass beads packed MPR within short residence time (20 s), which was more than 2 orders of magnitude larger than value obtained in wall-coated MPR under the same operational conditions. Moreover, the packed MPR showed good durability, which declined by about 17 % after 6 h of operation and then remained stable for next 19.5 h.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chaogang Ban,Yang Wang,Jiangping Ma,Yajie Feng,Junjie Ding,Youyu Duan,Xue Liu,Bin Zhang,Jinjing Tang,Xiaoping Tao,Liyong Gan,Shuangshuang Tan,Xiaoyuan Zhou
Rational fabricating advanced photocatalysts to recycle CO 2 into solar fuel is one of the most promising approaches to simultaneously address energy shortages and global warming. TiO 2 has been widely used in photocatalytic CO 2 reduction due to its abundant reserves, non-toxicity and harmlessness etc. However, it remains significantly challenging for practical applications due to the fast electron-hole recombination. Herein, we design a direct TiO 2 based Z-Scheme heterojunction by self-assembly of C-doped TiO 2 nanoparticles on 3D hierarchical petal of flower-like β-Bi 2 O 3 (C-TiO 2 /β-Bi 2 O 3 ). In situ electron paramagnetic resonance tests, in situ X-ray photoelectron spectroscopy and theoretical calculations reveal that electrons are transferred from β-Bi 2 O 3 to C-TiO 2 due to the formation of Z-Scheme heterojunction, which greatly accelerates the separation of photogenerated carriers to promote efficient CO 2 photoreduction. Ultimately, the optimal heterojunction shows significantly enhanced photocatalytic activity for CO 2 reduction to CO (31.07 μmol g –1 h −1 ) compared to the pure TiO 2 (3.28 μmol g –1 h −1 ) without using any photosensitizers and sacrificial agents. This work provides a unique insight to design direct Z-Scheme heterojunctions and delivers a promising photocatalyst for overcoming global warming and energy-supply issues.
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