JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Mengying Tao,Zhaowei Jia,Hui He,Yanhu Han,Xin Yu,Yaofei Ren,Yuewei Wu,Yintong Lin,Zhongfeng Shi,Zhenxia Zhao,Zhongxing Zhao
Photocatalytic reduction of CO 2 exhibits unsatisfactory photocatalytic performance owing to the inefficient separation of photogenerated electron-hole pairs, low CO 2 capture efficiency and limited visible light absorption on most photo-catalysts. Herein, Ti F bridged IL-CuCQDs-F/TiO 2 inverse opal composite (IO-CFTi) was constructed for boosting CO 2 visible-photo reduction via slow photo effect. In this work, ethylenediaminetetraacetic acid (EDTA(Cu)) and imidazole ionic liquid 1-(2-Hydroxyethyl)-3-methylimidazolium tetrafluoroborate ([HOEtMIM][BF 4 ]) were employed to confine grow of IL-CuCQDs-F within TiO 2 inverse opal supporter via Ti F bonds connection. Unique IL-CuCQDs-F efficiently expended light absorption towards visible region, and the confined growth of IL-CuCQDs-F within the TiO 2 inverse opal cavity achieved the photoelectric conversion and efficient CO 2 capture. Moreover, their Ti F bonding interface of IO-CFTi assisted photogenerated electron transportation from TiO 2 to CO 2 for its reduction in this system. Consequently, IO-CFTi achieved a substantially increased CO production rate of 78.1 μmol·h −1 ·g −1 with 98 % selectivity. This improved performance in CO 2 photoreduction positions the nanocomposite as a promising material for preservation of the environment and conversion of energy.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Yuanyuan Chen,Xilun Wang,Ziruo Zeng,Meiru Lv,Kangfu Wang,Hao Wang,Xiaoning Tang
TiO 2 /TiOF 2 Z-scheme nanosheets have been successfully synthesized for photocatalytic antibacterial. The antibacterial efficiency of TiO 2 /TiOF 2 against E. coli and S. aureus were 99.90 % and 81.89 % at low material concentration (110 μg/mL), respectively, which are higher than those of pure TiO 2 , TiOF 2 , and Degussa P25. In situ molecular spectroscopy results demonstrate that the microstructure of the synthesized material can be reconstructed and optimized to enhance the exposure of the active sites·H 2 O and O 2 are effectively adsorbed on the catalyst surface and activated to form OH…Ti and O…Ti surface active species. Furthermore, the dense interface formed in TiO 2 /TiOF 2 acts as an efficient transport path for photoexcited electrons from TiO 2 to TiOF 2 , and thus accelerates the formation of reactive oxygen species . Finally, the mechanism of bacterial inactivation is systematically discussed considering the main active substances, cell morphological changes, and activity of antioxidant enzymes.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Fengyu Gao,Jiyue Zhang,Jiaying Jiang,Xiaolong Tang,Yuansong Zhou,Honghong Yi
This paper explores an eco-friendly and efficient photocatalytic oxidation (PCO) technology aimed at converting NH 3 into N 2 , which holds considerable importance for environmental conservation and human well-being. Building upon previous investigations of N-TiO 2 catalysts, the research group successfully synthesized an N-TiO 2 catalyst featuring a carbon layer on its surface via mechanical mixing followed by calcination at 400 °C (denoted as C/N-TiO 2 (1), 1 represents the molar ratio of N and Ti). The analysis concentrated on the influence of C content on the PCO efficiency of NH 3 , revealing a peak performance correlated with increasing C levels. Notably, the C/N-TiO 2 (1) catalyst with 3.0 wt% C exhibited remarkable catalytic performance, achieving a conversion rate of 94 % and selectivity of 98 %. The enhancement of catalytic activity and selectivity is primarily attributed to the co-doping of C and N elements. Experimental results indicate that doping with N alone effectively suppresses the recombination of photogenerated carriers under visible light. Furthermore, the simultaneous doping of C and N significantly reduces the band gap energy of TiO 2 (3.18 to 2.90 eV), thereby broadening its photoresponse range. Concurrently, more Ov (Oxygen vacancy) are formed under visible light irradiation, which enhances the PCO performance. More importantly, more acidic sites are introduced to improve the catalyst’s adsorption capacity for NH 3 . Additionally, the impact of various reaction components on the PCO capability of the 3.0 wt% C/N-TiO 2 (1) catalyst is examined further. The findings indicate that oxygen anion radicals produced from O 2 play a critical role in facilitating NH 3 -PCO. However, the presence of CO 2 and extra H 2 O could hinder the approach of NH 3 molecules to the active sites and decrease the longevity of photogenerated ·OH, consequently reducing catalytic effectiveness. This research introduces fresh insights and optimization approaches for enhancing the activity, selectivity, and stability of catalysts.
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MOLECULES
·
2024
·Vol. 29
·期 16
·3812
·
IF 4.2
Yongwei Li,Zhihao Fang,Lijuan Feng,Fangfang Liu,Yucui Shi,Jiao Li,Chao Zhao
A series of Zr-TiO2catalysts were prepared using a facile sol-gel method and were used for N-methylmorpholine (NMM) oxidation to N-methylmorpholine-N-oxide (NMMO). The structure features of Zr-TiO2catalysts were studied in detail through a variety of characterization methods, such as XRD, SEM, N2adsorption-desorption isotherms, XPS, EPR, and O2-TPD. As-obtained 5%Zr-TiO2catalysts had superior catalytic performance and stability with a 97.6% NMMO yield at 40 °C, which related to Zr doping, a higher surface area, more oxygen vacancies, and oxygen chemisorption on the catalytic surface. This work provides an efficient preparation strategy of TiO2-based catalysts for selective oxidation reactions by a facile method.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junfeng Yang,Jinsong Lu,Liangsheng Xie,Jingfeng Wu,Yu Wen,Qin Zhang
Herein, the SrTiO 3 -TiO 2 -CaTiO 3 /Cu 2 O quaternary composite has been designed and prepared via one-step hydrothermal process followed by a NaBH 4 reduction treatment. By comparing the H 2 production rate (HPR) of Sr-Ti-Ca/Cu samples prepared by different Cu sources, it is found that Sr-Ti-Ca/Cu has the best H 2 production performance when CuCl 2 is as Cu source. As expected, the highest HPR of Sr-Ti-Ca/Cu sample is up to 5.088 mmol g −1 h −1 , which is 195.7 times as higher as that of the Sr-Ti-Ca sample (0.026 mmol g −1 h −1 ) under the same conditions. Moreover, the HPR reached 0.692, 0.530 and 0.647 mmol g −1 h −1 in tap water, lake water and river water, indicating that the photocatalyst has high practicability in natural water sources. In addition, the experiment of the tap water composition effect on H 2 production performance shows that NO 3 − and SO 4 2− ions have great negative influence on the HPR. Compared with Sr-Ti-Ca, the light absorption of Sr-Ti-Ca/Cu extends over the entire visible region, the interface resistance decreases, and the photocurrent density increases. These results suggest that the well-designed dual p-n heterojunctions and dual type-II heterojunctions in Sr-Ti-Ca/Cu sample can enhance the light absorption in the ultraviolet region and realize the rapid separation and migration of photogenerated charge, thereby accelerating the production of H 2 . This work shows the strong advantage and potential of non-precious metal efficient photocatalyst system for producing H 2 from deionized water and natural fresh water.
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Catalysts
·
2024
·Vol. 14
·期 12
·886
·
IF 3.8
Zhiyong Fang,Xiangyu Song
In the study presented herein, a series of TiO2-supported Ru catalysts were prepared through over-impregnation with different amounts of H2O2and applied to the catalytic combustion of dichloromethane (DCM). The experimental results show that the optimal (1 H2O2)-Ru@TiO2catalyst sample yields 90% DCM conversion at 301 °C, which is 40 °C lower than the temperature required by the (0 H2O2)-Ru@TiO2catalyst. This good activity is related to its high number of acid sites (especially Brønsted acid sites), an appropriate amount of uniformly dispersed RuO2particles, and strong interaction between RuO2and the TiO2support. In addition, excessive H2O2leads to the growth and phase segregation of RuO2, which weakens the interaction between RuO2and the TiO2support and decreases catalytic activity. Moreover, H2O2addition also contributes to the stability of catalysts, which possibly results from the re-dispersion of RuO2on the TiO2support during the reaction.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Huiling Ding,Mengke Zhang,Yan Liu,Yize Yao,Zenghui Mai,Huaixin Zheng,Bo Song,Bingbing Fan,Hailong Wang,Hongxia Lu
With the rapid development of global economy and industrialization, the management and protection of water resources have become increasingly important. In this paper, a novel three-dimensional Chitosan/Fe 3 O 4 /TiO 2 @MXene photocatalyst with excellent degradation and bacterial inhibition properties was prepared by a simple one-step hydrothermal method using FeCl 3 ·6H 2 O, Chitosan (CS) and MXene (Ti 3 C 2 ) as main raw materials. TiO 2 was generated in-situ on the surface of Ti 3 C 2 nanosheets and modified by loading Fe 3 O 4 nanoparticles and CS films. The conformations and band gaps of the composites were modified, and then photocatalytic mechanisms, phase compositions, morphological structures, magnetic properties and photoelectrochemical properties of the photocatalysts were systematically analyzed. The degradation efficiency of the CS/Fe 3 O 4 /TiO 2 @Ti 3 C 2 composite photocatalyst can reach 95.9 % when the ration of CS to FeCl 3 ·6H 2 O is 1:3 and the hydrothermal temperature is 180 °C, which showing excellent photocatalytic performance. Meanwhile, the inhibition rate of Staphylococcus aureus ( S. aureus ) is close to 98.91 % under the light condition. This study further reveals that visible light is a cost-effective way to treat pollution in terms of degradation and bacteriostatic inhibition, and the composite photocatalysts can be efficiently recycled and reused under the action of a magnetic field.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
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IF 4.7
Mengyao Hua,Siyi Wang,Meng Cheng,Guangming Liang,Lei Xu,Yafen Zhou
Photocatalysts TiO 2 @UiO-66-(OH) 2 was successfully synthesized via an impregnation method for removal of formaldehyde under high pressure mercury lamp irradiation, and the photocatalysts were characterized by using a variety of analytical techniques. The characterized results indicated that TiO 2 was attached to the surface of UiO-66-(OH) 2 , and there was a strong electronic interaction between the elements of TiO 2 and UiO-66-(OH) 2 in the composite. The synergistic combination of high adsorption capacity of UiO-66-(OH) 2 , high dispersion of TiO 2 and efficient interfacial charge transfer between UiO-66-(OH) 2 and TiO 2 have a significant impact on the enhanced photocatalytic performance for formaldehyde removal. And the hydroxyl radicals (⋅OH) and superoxide radicals (⋅O 2 − ) also play a major role in removal of formaldehyde. The formaldehyde removal rate of 20TiO 2 @UO (1 g 0.15 m 3 ) is 83.01 % within 5.5 h, if the removal time is extended to 24 h, the formaldehyde removal rate can reach 91.49 %, and the continuous photocatalytic reaction showed that the composite is a highly stable catalyst. This could provide a useful method for highly efficient formaldehyde in indoor air purification.
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Industrial Chemistry & Materials
·
2025
·
IF 11.9
Yan-Chao Qu,Guangyue Xu,Chen Chen,Jianhua Guo,Dingjia Liu,Haiwei Jia,Haonan Guo,Shuya Jia,Jiazhen Jia,Ying Zhang,Lifeng Yan
The development of novel low-temperature selective catalytic reduction (SCR) denitrification catalysts is a crucial research direction for reducing pollution and carbon emissions. Although V2O5-MoO3/TiO2 catalysts have been widely used in commercial applications, achieving effective SCR denitrification for low-temperature flue gases remains a significant challenge. In this study, the catalytic efficiency of the catalysts was systematically investigated and optimized by constructing Pearson linear correlation coefficient models between catalytic activity and different pore structures, substrate crystal planes, and active site components and properties, etc. Through comprehensive characterizations and experiments, anatase TiO2 loaded with 3% V2O5 and 10% MoO3 was developed and demonstrated excellent catalytic activity and stability even in high sulfur content and low-temperature environments. The catalyst was deployed in a pilot plant for over two years, consistently achieving a monthly average denitrification efficiency of over 67% and maintaining an outlet NOx concentration below 50 mg/Nm³. This study provides a robust and efficient low-temperature catalyst for SCR denitrification and offers valuable insights for future catalyst optimization.
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ACS Catalysis
·
2025
·
IF 13.1
Hailong Xie,Yishu Wang,Yu-Hui Xie,Dong Feng,Feng Wu,Delong Xie,Yi Mei,Yu-Xin Liu
Photoreforming of plastic waste offers a solution for reducing environmental pollution while producing value-added products. This study investigates the impact of conduction band edge modulation on the photoreforming efficiency of waste polyethylene terephthalate (PET) using a TiO2/black phosphorus nanosheet (BPNS) heterojunction catalyst, leveraging the tunable bandgap and high carrier mobility of BPNSs. The BPNS/TiO2 heterojunction demonstrated remarkable PET degradation under simulated solar illumination, achieving an 80% weight loss after 35 h. Simultaneously, the system exhibited efficient hydrogen evolution, producing 345.2 μmol g–1 h–1 of H2. Bandgap modulation analysis revealed that as the conduction band edge (ECB) of the photocatalyst became more negative, the increase in CO evolution rates surpassed those of H2 and CO2, likely due to enhanced charge transfer, stronger oxygen adsorption, and a more negative reduction potential. The influence of bandgap tailoring on charge separation, transfer dynamics, and oxygen radical generation, directly linked to photoreforming efficacy, was analyzed through EIS, ESR, and DFT calculations. This study underscores the potential of BPNS/TiO2 heterojunctions for efficient and selective photoreforming of different plastic waste, offering valuable insights into catalyst design for environmental remediation and energy recovery.
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ACS Catalysis
·
2025
·
IF 13.1
Yu-Dong Shan,Yu-Le Wang,Qing He,Yi-Fang Lu,Song-Hai Wu,Yong Liu,Xu Han
Selective oxidation of cyclohexane (CHA) to KA-oil (cyclohexanol/cyclohexanone) is an important reaction in the chemical industry, which is constrained by high energy consumption and low selectivity. In this study, Mo-doped mesoporous TiO2 (Mo-MT) has been successfully synthesized via calcinating MIL-125(Ti) doped with molybdenum acetylacetonate. A series of characterizations and density functional theory (DFT) calculations reveal that the doped Mo not only decreases the band gap from 3.02 eV (MT) to 2.71 eV (Mo-MT-2) and enhances efficiencies in charge separation and photogenerated carrier transfer but also directly reduces O2 to Mo-η2-O2 peroxo on Mo-MT-2, achieving a 3.2 times higher yield of KA-oil (62.7 μmol) than that by P25 and a high selectivity toward KA-oil of 99.9% under visible-light irradiation. Meanwhile, electron shuttling of benzoquinone facilitates electron transfer from CHA to O2, thus significantly enhancing the KA-oil yield from 62.7 to 431.0 μmol. Diffuse reflectance infrared Fourier transform spectroscopy and electron paramagnetic resonance analyses confirm the electron-shuttling roles of benzoquinone in H-abstraction and H-transfer during selective photooxidation of CHA by Mo-MT-2. DFT calculations further reveal that the benzoquinone-hydroquinone/semiquinone-benzoquinone cycle shuttles electrons from CHA to Mo-η2-O2 peroxo on the surface of Mo-MT-2, thus facilitating H-abstraction from CHA to form C6H11·, coupled with the formation of H2O2. The produced C6H11· then eventually reacts with O2 to form KA-oil. This study enriches our understanding of the importance of peroxo species and electron shuttles in selective photooxidation of C(sp3)–H.
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SOLAR ENERGY
·
2025
·
IF 6.6
Zhen Li,Guizhang Guo,Zhou Yu,Zengyue Ma,Yonggang Lei,Libo Yu,Junke Wang
The use of quantum dots (QDs) to sensitize titanium TiO 2 in photoelectrochemical cells (PECs) for solar-driven water splitting represents a highly promising method for converting solar energy into storable chemical energy in the form of hydrogen. The characteristics and interfaces of the QDs play a crucial role in determining the range of light absorption and the efficiency of charge transport and separation upon photoexcitation. Herein, we build CdS x Se 1-x QDs sensitized TiO 2 photoanodes with different amount of Se source by one-step hydrothermal process using thioglycolic acid (TGA) as bifunctional linker. Our results demonstrate that TGA can both anchor QDs to TiO 2 and decompose S for CdS x Se 1-x QDs preparation. The influence of Se source dosage on PEC performance of CdS x Se 1-x /TiO 2 photoanode has been investigated. UV–vis absorption data shows the increase of Se source can enlarge light response range. X-ray photoelectron spectroscopy, transient open-circuit voltage decay and electron lifetime tests indicate proper thickness of SeO 2 which formed on CdS x Se 1-x QDs has the effect to block charges recombination between CdS x Se 1-x /TiO 2 photoanode and electrolyte, improving the electron lifetime of photogenerated electrons. Consequently, the photoelectrochemical cell (PEC) constructed with a CdS x Se 1-x /TiO 2 photoanode, prepared using 0.8 mmol of selenium source, has achieved a photocurrent density of 14.31 mA cm −2 and a photoconversion efficiency of 15.74 %. These results indicate significant potential for the production of green hydrogen.
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