SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Wei Liu,Daoyin Liu,Hongjian Tang,Zhenkun Sun,Lunbo Duan
Synthesis of efficient photocatalysts is essential for the removal of antibiotic-based contaminants from wastewater. In this work, novel Z-scheme (SiO 2 /TiO 2 )/Bi 2 WO 6 (SiTiBi) heterojunction photocatalysts are synthesized by atomic layer deposition and hydrothermal methods, and the photocatalytic performance is improved by constructing oxygen vacancies and internal electric field (IEF). 15-SiTiBi (15 wt% SiO 2 /TiO 2 ) exhibits excellent photocatalytic activity, with 89 % LVF degradation in 30 min and a degradation kinetic constant of 0.072 min −1 . In addition, based on free radical trapping, electron spin resonance, photoelectrochemical tests, and DFT calculations, show that oxygen vacancies enhance the light absorption, and IEF strengthens the separation and migration of photogenerated carriers. Finally, the degradation intermediates and degradation pathways of LVF are predicted using LC-MS and first-principles. This work provides an effective method for constructing interfacial structures that facilitate the separation of photogenerated carriers and promote antibiotic degradation.
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高影响因子
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
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2025
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IF 3.8
Kiguchi Manabu,Wang Jingshen,Yuxin Li,Zhang Dan,Liang Zhongoing,Ma Mei,Fujishima Akira,Hanada Nobuhiro
Nano-sized magnetic photocatalysts (nano TiO2-SiO2/Fe3O4) with a particle size of approximately 20 nm were developed for efficient water treatment. Their photocatalytic performance was comparable to the nano particle photocatalysts, P25. Furthermore, the photocatalysts could be conveniently separated from treated water using a magnet. We then applied the photocatalysts to photokilling of Lactobacillus casei and degradation of persistent herbicides (simetryn, prometryn, metolachlor, and sulfometuron methyl). Lactobacillus casei, a Gram-positive bacterium lacking an outer membrane, was introduced and validated as a reliable model bacterium for photocatalytic antibacterial assessments. Complete photokilling of Lactobacillus casei occurred within 50 minutes of UV irradiation, demonstrating simpler kinetic behavior compared to traditionally used Gram-negative model organisms. The photocatalysts also exhibited effective degradation toward four persistent herbicides. Their concentrations decreased from 10 ppm to below 1 ppm within 120 minutes.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Linghui Peng,Haiyu Wang,Guiying Li,Weiping Zhang,Zhishu Liang,Taicheng An
Most commercial air purifiers rely on dense fibrous filters for bioaerosols control, which filter the particulate matter size-dependently without bactericidal activity. Herein, the non-size-dependent bifunctional nickel foam filters (g-C 3 N 4 /TiO 2 (CT)/Ni-polydopamine(PDA)/Ni bifunctional filter) with two layers of coupling nickel foams deposited by CT and PDA, respectively, were developed. The bifunctional filter shows remarkable non-size dependent bacteria removal efficiency (93.5 %) and inactivation efficiency (∼70 %) within 20 min at high airflow (12.5 L min −1 ). The inactivation efficiency can be further increased to 99.99 % with prolong irradiation time and enhancement of light intensity. The non-size dependent capture effect of the CT/Ni-PDA/Ni provided by adhesive force and charge was verified. In addition, the assumption that reactive oxygen species (ROSs) could be transferred into air during bacteria inactivation was first proved by chemiluminescent. This pioneered study may provide new insights into the development of bifunctional filters for non-size dependent capture and photocatalytic inactivation of bacteria in bioaerosols .
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Cangpeng Shan,Qinwei Jia,Yan Zhang,Guoshuai Liu,Xinyu Hou,Yunchong Wang,Rui Han,Caixia Liu,Weichao Wang,Qingling Liu
Removing industrial source CO through catalytic oxidation and providing heat for denitrification units have significant economic and environmental benefits. Sulfur poisoning of catalysts is the bottleneck to stabilize the system operation. To overcome this problem, we fabricated sulfate modified Pt/TiO 2 by appropriate NH 4 HSO 4 deposition, which survived in the SO 2 environment with the concentration as high as 1000 ppm SO 2 , and exhibited an outstanding stability with over 90% CO conversion at 200 °C for 500 h under a typical steel sintering flue gas condition. Experimental and theoretical explorations confirmed that the electronic structure of PtO x clusters was optimized through Pt-O-S bridges after sulfate modification. The O 2p band center closer to the Fermi level and the smaller energy difference between Pt 5d and O 2p band centers led to more active lattice oxygen of PtO x clusters. The more stable π back bonding between Pt 5d and CO 2p and weaker hybridization between Pt and the π⁎ (Ssp2-Osp2)2 orbital of SO 2 indicated enhanced CO adsorption while weakened SO 2 adsorption on Pt sites. The above factors simultaneously improved the low-temperature activity and sulfur resistance for CO oxidation over sulfate modified Pt/TiO 2 . This work provides new insights for the design of sulfur-resistant catalysts and the understanding on the effect of sulfates on catalytic activity.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Wenqing Xu,Yixi Wang,Hong He,Jun Yang,Yang Yang,Jinzhu Ma,Chaoqun Li,Tingyu Zhu
High–performance catalysts are extremely required for controlling NH 3 emission via selective catalytic oxidation (SCO), and the anchoring structural feature of active sites is a key prerequisite for developing them. This study confirms the importance of hydroxyl groups on vacancy–deficient reducible oxides as active groups. On the one hand, spontaneous atomic dispersion of active metal Ir is promoted by the abundant terminal hydroxyl groups. On the other hand, Ir cations anchor on the TiO 2 surface through exchange with H + in Ti–OH groups, and thus occupy the Brönsted acid sites. The adsorption strength of NH 3 is another key factor affecting the reaction rate–determining step, namely NH 3 dehydrogenation , which occurs at a faster rate in the coordinated L–NH 3 rather than the ionic B–NH 4 + . Meanwhile, the coordinated L–NH 3 significantly avoids the competitive adsorption of water vapor in the NH 3 –SCO reaction by reducing the number of hydrogen bonding. The TOF of preferred 0.8Ir/TiO 2 sample is significantly higher than 0.2Ir/TiO 2 sample, although Ir is almost always atomic dispersed. Finally, NH 3 conversion is 85% in a wet circumstance (5% H 2 O) at 240 °C (GHSV = 85 000 h –1 ), with a N 2 selectivity of up to 65% on 0.8Ir/TiO 2 sample.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Tianwei Dou,Yangyang Zhu,Zhanyu Chu,Lei Sun,Zhijun Li,Liqiang Jing
TiO 2 mesoporous hollow nanofibers with excellent mass diffusion is an attractive photocatalytic material to remove toxic gaseous pollutants like CO, while it is highly desired to improve the photogenerated charge separation and O 2 activation. Herein, the Au nanoparticles inner-loaded TiO 2 mesoporous hollow nanofibers (Au@TO MPHNFs) have been controllably fabricated by one-step coaxial electrospinning, in which it is crucial to use polyethyleneimine as porogen and stabilizer for mesoporous and TiO 2 in nanofibers shell. Concurrently, a stepwise phase transfer technique is employed to realize the uniform and stable dispersion of the Au in the paraffin oil as core precursor. The Au@TO MPHNFs exhibits 2.7 and 7.4-fold CO photooxidation enhancement compared with commercial P25 and TO MPHNFs, respectively. The enhanced photoactivity can be attributed to the creation of the mesoporous hollow structure for facilitating better mass transportation, and the incorporation of Au nanoparticles for efficient charge separation and O 2 activation. Meanwhile, the photothermal effect of Au expedites intermediaries transformation and product desorption.
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FOOD CHEMISTRY
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2025
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IF 9.8
Chen Hu,Chao Yang,Bo Li,Bangzhu Peng
Consumption of contaminated wines is a significant source of ochratoxin A (OTA) intake in humans, yet existing techniques for OTA removal are inadequate. This study constructs a TiO 2 /SiO 2 /g-C 3 N 4 catalyst (TiSiMs-TCN) with a tubular structure, capable of efficiently removing OTA from both simulated and real wines under visible light irradiation. The results of experiments, characterizations, and theoretical calculations demonstrate that the incorporation of silica enhances the adsorption capacity for OTA, and the tubular structure improves the catalyst's photoelectric properties. The internal electric field between TiSiMs and TCN facilitates electron transfer and the generation of active species, rapidly degrading the adsorbed OTA and promoting the regeneration of active sites, thus maintaining continuous adsorption-photocatalysis synergy. The OTA degradation pathway was analyzed using the Fukui index, electrostatic potential distribution, and intermediate product identification. Toxicological experiments confirm that TiSiMs-TCN is a safe and stable material capable of effectively detoxifying OTA contamination.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Zaizhi Yang,Xi Wang,Liang Zhang,Hailin Li,Hui Zhang,Dong Xu
(Ca, Ta) co-doped TiO 2 ceramics were successfully prepared using flash sintering technology, and the effects of oxygen vacancies on the rapid densification and giant dielectric properties were studied. The results suggest that the maximum volume fraction of oxygen vacancies in flash-sintered samples is approximately 10%. Oxygen vacancies decrease the barrier energy level of atomic diffusion and provide convenient diffusion channels, resulting in rapid densification of the sample within 24 min at 1100 °C. All flash-sintered samples exhibit high relative density, exceeding 95%. Oxygen vacancies promote the electron-pinning defect dipole effect at low temperatures. As the temperature increases, carriers such as oxygen vacancies move to the grain boundary, forming an internal barrier layer capacitance effect. The optical dielectric constant reaches 7.25 × 10 4 , and the dielectric loss drops to 0.09. Oxygen vacancy play an important role in both flash sintering technology and the giant dielectric properties of co-doped TiO 2 ceramics.
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高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Cuicui Zhou,Shiqi Hong,Xinyu Chen,Quanfeng Li,Zongqi Chen,Songwang Yang
The electron transport layer (ETL) plays a critical role in efficient and stable perovskite solar cells (PSCs). The current effective method for the large-scale preparation of metal oxide ETLs is mainly based on expensive sputtering processes. Here, a screen-assisted self-spreading method is proposed as a novel approach to prepare uniformly thin and conformal TiO2 films on a rough fluorine-doped tin oxide (FTO) substrate as an ETL in planar PSCs. The TiO2 ETL deposited by this method exhibited good coverage and homogeneity on the rough FTO substrate, thereby minimizing interfacial recombination. The photovoltaic performance of the PSCs fabricated by this method is superior to that of the cells fabricated by spin coating, especially in terms of the fill factor. The performance enhancement can be attributed to the complete coverage of the FTO substrate by the conformal TiO2 film, confirming the effectiveness and reliability of the proposed method for the preparation of the TiO2 ETL. The advantages of this method lie in its scalability to prepare oxide films with a large area, eliminating the requirement of complex equipment, such as spinners, sputters, or physical vapor deposition equipment.
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PubMed
高影响因子
Nanomaterials
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2024
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IF 4.4
Fangqin Liu,Mingjie Fan,Xia Liu,Jinyang Chen
A cellulose-based carbon aerogel (CTN) loaded with titanium dioxide (TiO 2 ) and graphitic carbon nitride (g-C 3 N 4 ) was prepared using sol–gel, freeze-drying, and high-temperature carbonization methods. The formation of the sol–gel was carried out through a one-pot method using refining papermaking pulp, tetrabutyl titanate, and urea as raw materials and hectorite as a cross-linking and reinforcing agent. Due to the cross-linking ability of hectorite, the carbonized aerogel maintained a porous structure and had a large specific surface area with low density (0.0209 g/cm 3 ). The analysis of XRD, XPS, and Raman spectra revealed that the titanium dioxide (TiO 2 ) and graphitic carbon nitride (g-C 3 N 4 ) were uniformly distributed in the CTN, while TEM and SEM observations demonstrated the uniformly distributed three-dimensional porous structure of CTN. The photocatalytic activity of the CTN was determined according to its ability to degrade rhodamine B. The removal rate reached 89% under visible light after 120 min. In addition, the CTN was still stable after five reuse cycles. The proposed catalyst exhibits excellent photocatalytic performance under visible light conditions.
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PubMed
高影响因子
OPTICAL MATERIALS
·
2024
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IF 3.8
Xiaoyun Ye,Hangyu Zhong,Long Chen,Yumei Zhang,Yuping Wu,Wei Tian,Li-An Ma,Qianting Wang
Reasonable interface design is a key factor to improve the activity of photocatalysts. In this paper, TiO 2 /Ti 3 C 2 composite photocatalyst with high activity of anatase/rutile mixed crystal were prepared by solid-phase milling-roasting method. The microstructure of the mixed-phase TiO 2 /Ti 3 C 2 composites could be adjusted by the calcination temperature and additive content. The results showed that NaBF 4 could promote the transformation of anatase TiO 2 to rutile TiO 2 . An appropriate amount of rutile TiO 2 forms a heterojunction with anatase TiO 2 , which enables efficient charge separation and transfer at the interfaces of the composites. The optimized sample (MT550) showed 98 % degradation of rhodamine B (RhB) under visible light irradiation within 180 min, which was 8 times higher than that of the sample without added NaBF 4 . This study presents a strategy for the synthesis of mixed-phase (anatase/rutile) TiO 2 /Ti 3 C 2 composites with high activity under visible light, which has potential in the design and application of photocatalytic materials.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
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IF 3.764
Like Ouyang,Yan Zhang,Yuan Wang,Xinlong Wang,Shaojun Yuan
The coupled adsorption–photocatalytic oxidation process provides a great potential scenario to enhance the removal efficiency of arsenite contaminants by converting As(III) to As(V) and simultaneous adsorption. In this study, the boron-doped black TiO2/g-C3N4 nanocomposite is synthesized by combination of sol–gel and in situ decomposition-thermal polymerization methods as a photocatalyst for the photocatalytic oxidation and adsorption of As(III). Under dark conditions, the boron-doped samples (B-TiO2 and B-TiO2/g-C3N4) display an increase in the As(III) adsorption capacity by one order of magnitude up to circa 3.2 mg g–1 with an initial As(III) concentration of 2 mg L–1 at 298.15 K and pH 5. The adsorption kinetics of As(III) on B-TiO2/g-C3N4 conform to the pseudo-second-order kinetic model, revealing the chemical adsorption mechanism. Under visible light irradiation, the total arsenic removal capacity is substantially improved by 20% with a removal capacity of 3.9 mg g–1. The enhancement of arsenic adsorption is attributed to the chemical complexation and hydrogen bond, in which B–OH bonds play a dominant role. The photocatalytic oxidation mechanism of the as-synthesized B-TiO2/g-C3N4 is attributed to the synergism of superoxide radicals, hydroxyl radicals, and photogenerated holes.
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