SOLID STATE SCIENCES
·
2023
·
IF 3.5
Yinghua Lan,Xuejing Wang,Yanmei Chen,Juan Xu,Yanhui Zhang
The synergistic effect of heavy metal ions and organic pollutants can enhance the photocatalytic performance and provides a new idea for environmental governance, so it has important research value. In this work, we prepared Pd–TiO 2 composites by ascorbic acid reduction method, and obtained the crystal structure, morphology and surface state information of the composites through a series of characterizations, which verified the successful preparation of the composites. It was used for simultaneous photocatalytic removal of bisphenol A (BPA) and Cr(Ⅵ), and it was found that the photocatalytic removal efficiency was significantly improved compared to their individual removal. This can be attributed to the synergistic effect between BPA and Cr(Ⅵ), where they enhance the separation efficiency of photogenerated electron-hole pairs and prolong the lifetime of photogenerated carriers. In addition, the effects of BPA concentration and Cr(Ⅵ) concentration on photocatalytic removal efficiency were also investigated. The mechanism of photocatalytic degradation of BPA by Cr(Ⅵ) coupling system was discussed by changing the experimental conditions, it is proved that the photocatalytic products of BPA can improve the removal efficiency of Cr(Ⅵ).
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JOURNAL OF MEMBRANE SCIENCE
·
2023
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IF 9.5
Yuxie Jiang,Kai Wang,Yingzhen Zhang,Yan Cheng,Tianxue Zhu,Jianying Huang,Weilong Cai,Yuekun Lai
In this paper, a stainless steel mesh coated with titanium dioxide (TiO 2 @SSM) membrane was developed for the separation of stable oil-water emulsions and the degradation of soluble pollutants. The TiO 2 @SSM membrane showed excellent underwater anti-oil adhesion performance and efficient emulsion separation under gravity (flux of 207.7 L m −2 h −1 and efficiency of 99.58 % for toluene-water emulsion). The emulsion could also be pre-broken by microbubble flotation to enhance the separation performance of the TiO 2 @SSM membrane (microbubble flotation followed by separation has a flux of 369.3 L m −2 h −1 , and efficiency of 99.71 %). And the synergistic operation of separation and microbubble flotation can increase the flux to 451.6 L m −2 h −1 . The membrane showed outstanding stability and could be recycled for more than 20 times without significant deterioration, and demonstrated chemical stability for corrosion resistance test (pH 0–14). In addition, the membrane, which is easily modified with silver nanoparticles , achieves improved photocatalytic degradation properties (efficiency from 58.8 % to 88.7 %) and microbubble flotation effect (flux of 613.4 L m −2 h −1 ). This work provides a rational strategy for the preparation and optimization of inorganic functional membranes for effective emulsion separation and dye degradation, and demonstrates promising applications of the separation and purification in oil-containing sewage and wastewater remediation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Zihan Tian,Yantao Song,Jing Zhang,Shuhao Qin,Yuanyuan Yang,Jianxin Li,Zhenyu Cui
Organic pollutants, such as dyes, contaminated water bodies seriously. Suitable materials and efficient technologies for degrading pollutants needed to be explored to protect the environment and human health. In this investigation, PVDF(PAA-g-β-CD)@TiO 2 hybrid film was prepared by a combination of “in situ hydrothermal-vapor induction” under mild conditions. The distribution, particle size, and interaction with the film surface for TiO 2 were investigated by XRD , XPS , SEM, and EDS . The TiO 2 nanoparticles were firmly immobilized and uniformly distributed on the hybrid film surface. Poly (acrylic acid) (PAA) and β-cyclodextrin (β-CD) on the film matrix were connected by the chemical bond, which provided stable nucleation and growth sites for TiO 2 while inhibiting photogenerated electron-hole recombination and significantly enhancing the adsorption ability. Furthermore, the multiple interaction forces (hydrogen bonding, coordination, and hydrophilic-hydrophilic interactions) between the film matrix and the TiO 2 were evaluated by simulated geometries and theoretical calculations. The multiple interactions reduced the band gap (Eg) while endowing the hybrid photocatalytic film with excellent degradation efficacy ( η ), stability, and recycling properties. Finally, the η of methylene blue (MB) reached 97.34 % within 120 min and remained above 90 % even after 8 reuses. It was believed that PVDF(PAA-g-β-CD)@TiO 2 film provided an approach for the mild preparation of polymer/TiO 2 hybrid film with high catalytic activity and optimization of photocatalytic properties.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Liu Yang,Jing Li,Guoqiang Cao,Yiyan Yang,Wen Luo,Zhiqi Zhang,Lizhi Feng,Xinglai Zhang,Baodan Liu
This study reports on the development of highly-efficient Pt/CuO-Fe 2 O 3 /TiO 2 monolithic catalysts for the low-temperature conversion of NO to N 2 via CO-SCR. In this case, ultrathin TiO 2 nanosheet arrays are designed to in situ grow on flexible Ti mesh to provide more spaces/areas for the loading of highly-dispersed Fe 2 O 3 and CuO active components. Furthermore, Pt nanoparticles with an average size of 1.30 nm are effectively decorated on the surface of CuO-Fe 2 O 3 /TiO 2 . The H 2 -TPR and NO-TPD results demonstrate that the excellent synergistic effect between TiO 2 , CuO, Fe 2 O 3 and trace amounts of Pt is conducive to enhance the adsorption of NO and finally promote the CO-SCR. The obtained Pt/CuO-Fe 2 O 3 /TiO 2 catalysts exhibit excellent CO-SCR performance with 100 % NO conversion, and 100 % N 2 selectivity at 250 °C, showing great potential of de-NO x application by using toxic CO as reductant in industry.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
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IF 8.7
Hanyu Liu,Zhuo Yu,Ming Xiao,Wenke Zhu,Junlong Liu,Lizhi Wang,Tao Xu,Wenlei Wang,Ting Yang
The efficient removal of arsenic from wastewater is still a challenge. In this paper, a heterojunction consisting of in-situ carbon-doped TiO 2 and nitrogen deficiency g-C 3 N 4 (C/TiO 2 @ND-C 3 N 4 ) has been constructed, which can completely oxidize As(III) (10,000 μg/L, 40 mL) to As(V) within 12 min under visible light and simultaneously adsorb total As (95.0%) with the pseudo-secondary kinetic equation , superior than in-situ carbon-doped TiO 2 (75.0%) and nitrogen deficiency g-C 3 N 4 (50.5%). The good photocatalytic oxidation and adsorption performances of C/TiO 2 @ND-C 3 N 4 on As(III) removal can be attributed to the successful synthesis of heterojunction. On one hand, the building of C–O–Ti interfacial chemical bonds enable rapid electron transfer and improve the efficiency of photocatalytic oxidation. On the other hand, the decreased As(V) adsorption energy resulted from the synthesized heterojunction boost the adsorption capability of As(V), which was completed by the generation of O–As bonds with oxygen-containing functional groups on the surface of TiO 2 and hydrogen bonds with high content pyrrole nitrogen derived from ND-C 3 N 4 , respectively. The results manifest that the preparation of bifunctional materials with both photocatalytic oxidation and adsorption properties provides a new strategy to achieve the removal of As.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yingguan Xiao,Jiajing Wu,Huiquan Li,Xiang Liu,Qian Li,Ying Zhang,Shunsheng Cao
Constructing phase junction is an effective strategy to increase photocatalytic performance of titanium dioxide (TiO 2 ) because it can promote charge separation. However, both low surface area and unstable phase interface limit its further application. In this investigation, we introduce a structural regulation strategy to prepare anatase/rutile TiO 2 (A/R–TiO 2 ) hollow photocatalyst through in-situ growth of rutile TiO 2 on anatase TiO 2 hollow microspheres byheat treatment. The as-synthesized A/R–TiO 2 photocatalyst was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet–visible (UV–vis) spectroscopy. The results reveal that the A/R–TiO 2 hollow photocatalyst significantly promotes efficient charge separation due to the intimate contact of two phases within a single hollow sphere. Notably, A/R–TiO 2 exhibits more efficient than commercial TiO 2 (P25) towards the photodegradation of various pesticide pollutants, which suggests that such a structural design can be an effective method for rationally constructing TiO 2 -based photocatalyst with advanced performance.
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ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Zhou Yanwen,Cai Feng,Li Wei,Qiu Jian,Xu Liang,Liu Qianyu,Zhang Yinlong
The post-treatment of recycling the fine photocatalyst nanoparticles restricts their application. In this study, a new photocatalytic material was synthesized by immobilizing the N-doped TiO2 and graphene oxide (GO) composite on polypropylene (PP) (N–TiO2/GO/PP) fibre sheet, and characterized based on X-ray diffraction spectroscopy (XRD), Raman spectroscopy and Scanning Electron Microscope (SEM). The photocatalytic activity was evaluated using roxithromycin (ROX) as a typical antibiotic pollutant. XRD, Raman spectra and SEM images proved that N–TiO2/GO/PP fibre sheet was successfully synthesized. The photocatalytic degradation of 10 mg L−1 ROX can reach up to 90% and the degradation rate constant was 0.2299 h−1 in surface water with the application amount of TiO2/GO/PP fibre sheet of 24.6 cm × 2.7 cm and reaction time of 9 h under the irradiation of simulated sunlight. The application amount of TiO2/GO/PP fibre sheet, initial concentration of ROX and water matrix significantly affect the degradation of ROX. A low concentration of natural organic matter (NOM) slightly promoted the degradation of ROX, while a high concentration of NOM significantly inhibited the degradation of ROX. Alkaline condition (pH 8–9) is favourable for the photocatalytic degradation of ROX by TiO2/GO/PP fibre sheet. The photocatalytic reactivity of the TiO2/GO/PP fibre sheet showed no significant decrease after three runs. Two primary degradation products of ROX were identified and they showed lower ecotoxicity than ROX. The results demonstrate that the new synthesized TiO2/GO/PP fibre sheet shows promising application prospects in the treatment of antibiotics in wastewater and surface waters.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
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IF 9.9
Lei Zhao,Zhaohui Huang,Xianghui Zeng,Xuan He,Daheng Wang,Wei Fang,Weixin Li,Xing Du,Hui Chen
Interfacial charge transfer resistance is one of the main limiting factors for realizing high photocatalytic efficiency of heterostructures system. Herein, an activated carbon layer is successfully introduced between the interface of polymer carbon nitride (CN) and TiO 2 heterostructure (CNP-x) as charge transfer medium by in situ pyrolysis carbonization method. Because of the lower spatial resistance of the crystalline/amorphous interface and the fast carrier transportation character of activated carbon, the efficiency of TiO 2 in extracting photoinduced electrons from CN was significantly improved. That is, the separation/transport of photocarriers in CNP-x heterostructure is accelerated, and the recombination time of photogenerated electrons and holes is prolonged. The CNP-1 exhibits a H 2 evolution rate of 1298.5 μmol h −1 with apparent quantum yield (AQY) of 34.5 %, 20.3 % and 12.6 % at 365 nm, 380 nm and 400 nm, respectively. This work offers a novel and unique strategy to promote interface charge separation and transport of CN-based heterostructures by accurately introduction charge transfer medium.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jia-Yi Shi,Zhen-Long Wang,Ke-An Wang,Hai-Bin Zhu
The electrochemical reduction of carbon dioxide into energy-carrying compounds or value-added chemicals is of great significance for diminishing the greenhouse effect. However, it is still imperative to replace the less-value anodic oxygen evolution reaction (OER) to improve the technical economy. Herein, we firstly reported a bifunctional CuS/TiO 2 catalyst for both anodic methanol oxidation reaction (MOR) and cathodic carbon dioxide reduction (CO 2 R). The in-built abundant CuS/TiO 2 heterointerfaces are found to boost the CO 2 R and MOR to produce formate. Based on the unique bifunctionality of CuS/TiO 2 , a paired electrosynthesis of formate was performed with a total Faradaic efficiency (FE) of about 170 %, in which the cathodic CO 2 R achieved a formate FE of about 70 %, and the anodic MOR exhibited an almost 100 % formate FE.
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Molecular Catalysis
·
2023
·
IF 4.6
Hua Yang,Zemin An,Yuanjie Xu,Lizhi Wu,Li Tan,Yu Tang
The restructuring of a catalyst under working conditions has been recognized as a critical factor that can significantly impact their performance in recent years. In this study, we investigate the behavior of a highly dispersed Ni supported on TiO 2 (P25) catalyst during the partial oxidation of methane (POM) to produce syngas. Our results reveal a distinct oscillation phenomenon in the catalyst's performance over time. The simultaneous oscillations of rapid deactivation and activation are observed, while the catalyst remains active for continuous POM reaction. Comprehensive characterizations suggest that this deactivation is not caused by traditional deactivation mechanisms with coke formation or Ni sintering. The formation of inactive NiTiO 3 results in catalyst deactivation, which is formed between Ni and TiO 2 support in the reductive atmosphere of POM products under high temperature due to strong metal-support interaction (SMSI). The simultaneous presence of oxidative and reductive atmospheres of the reactants and products in the POM reaction leads to the generation or demise of NiTiO 3 . The dynamic change of the Ni active sites during the in-situ reaction leads to the oscillation of the catalytic activity. This study sheds new light on the importance of SMSI in understanding the behavior of catalysts under working conditions.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 17
·5058-5070
·
IF 5
Zihan Lv,Zeng Hong,Chao Qian,Shaodong Zhou
Pt–Pd alloy nano-catalysts supported on TiO2 were developed to enable efficient light-induced photocatalytic N-alkylation of amines with alcohols. Various techniques such as BET, XRD, XPS, HRTEM, UV-vis DRS, and PL analysis were utilized to characterize the catalysts. The photocatalytic mechanism was discussed based on observation as well as theoretical calculation. It was found that Pt serves as a hydrogen shuttle, extracting hydrogen from alcohols to Pd for subsequent hydrogenation on the Pd site. By changing the Pd/Pt ratio, it is feasible to tune the reaction rates of methanol dehydrogenation and imine hydrogenation simultaneously, resulting in an efficient N-alkylation reaction. As a result, the optimum catalyst Pd1Pt1/TiO2 exhibits excellent catalytic performance which is superior to the previously reported ones in terms of both the catalytic efficiency and the production capacity.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Juntao Tang,Mengying Fu,Yidan Mao,Shuyi Yang,Wei Lin,Yan Yu,Shuang Song
Photocatalysis is regarded as a promising in situ air purification technology for the removal of volatile organic compounds. However, the deactivation of photocatalysts remains a serious issue that needs to be addressed. Herein, we report a novel dual-functional photocatalyst (TiO 2 @HYZ) with spatially separated catalytic sites and adsorption sites, which has been obtained by combining hydrophilic {0 0 1} TiO 2 nanosheets with hydrophobic NaY zeolite. TiO 2 @HYZ showed excellent photocatalytic activity for the degradation of gaseous toluene under UV irradiation in humid air. The optimized TiO 2 @HYZ-2 (containing 45.7 wt% TiO 2 ) achieved 96.6% toluene removal and 87.4% mineralization within 120 min. The specific reaction rate constant of TiO 2 @HYZ-2, pristine TiO 2 and P25 normalized by the unit amount of TiO 2 during the photocatalytic degradation process were calculated to be 0.481, 0.230 and 0.250 min −1 g −1 , respectively. Moreover, TiO 2 @HYZ-2 showed superior durability, maintaining stable performance over repeated toluene degradation processes, even at high toluene concentration, whereas pristine TiO 2 incurred severe deactivation with increasing number of photocatalysis cycles. The significantly enhanced activity and anti-deactivation property was attributed to a synergistic effect between HYZ and TiO 2 in the catalyst structure, which strengthened the adsorption of toluene on HYZ and facilitated effective separation of photoexcited charge carriers on TiO 2 , thus avoiding the deposition of degradation intermediates on the active sites and simultaneously improving mineralization. This work provided a new perspective for the design of efficient and deactivation-resistant photocatalysts for air pollution remediation.
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