JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 8
·3167-3180
·
IF 3.442
Ren Lipei,Yu Yan,Yang Yuan,Zhang Qian,Xiao Xingfang,Liu Ruina,Xu Weilin
Zeolitic imidazolate framework-8 (ZIF-8) is regarded as an excellent adsorbent material for removing diverse toxic or hazardous gases. However, its milli- to nanoscale size typically restricts its applications. In this study, we demonstrate the ZIF-8 nanocrystals assembled on TiO 2 -coated activated carbon fiber felts via atomic layer deposition (ZIF-8@ALD-ACF felts), which can be used as a highly efficient adsorbent for HCHO removal. Using the TiO 2 -coated ACF felts as substrates via ALD can provide large number of growth sites for ZIF-8 nanocrystals, which results in fast and highly efficient removal of HCHO. Furthermore, ZIF-8@ALD-ACF felts achieve a highly efficient removal of HCHO under ultraviolet (UV) light. HCHO can be completely removed at high concentration within 110 min. Moreover, under UV light, it can be completely removed at low concentration within 6 min. The micropores in ACF and nanocages in ZIF-8 are suitable for small molecular HCHO uptaking and provide sufficient contact time for photocatalysis by TiO 2 . The ALD technology provides a useful methodology for the practical application of MOF-based materials.
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JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 55
·期 6
·2471-2481
·
IF 3.442
Ji Lijun,Zhou Shu,Liu Xi,Gong Mindong,Xu Tong
PAN–COOH fibers were prepared with PAN fibers and used as templates, carbon source and nitrogen source for the first time to prepare carbon- and nitrogen-doped TiO 2 /carbon (C, N–TiO 2 ) composite fibers. The C, N–TiO 2 composite fibers were characterized by TEM, SEM, XPS, XRD, IR, Raman and UV–Vis spectrum. The composite fibers exhibited strong photocatalytic activity in photodegradation of Rh B solution under UV–Vis light. Doping C and N into TiO 2 materials could reduce the band gap width of TiO 2 and expand the light absorption range. The carbon fiber inside the composite fiber promoted the transfer of photoelectrons and inhibited the combination of photogenerated electrons and holes. The large specific surface area of C, N–TiO 2 composite fibers was also conducive to the photocatalytic activity. The macroscale C, N–TiO 2 composite fibers were easy for recycling. Therefore, the C, N–TiO 2 composite fibers had the potential for dealing with organic pollutants in water.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Chaofeng Zhong,Wei Weng,Xinxin Liang,Dong Gu,Wei Xiao
Phase junction construction and surface modification are two practical engineering strategies towards efficient photocatalysis. In the present work, the A natase/ R utile biphasic TiO 2 nanoparticles@ M oS 2 nanosheets ( ARM ) heterojunctions were directly constructed via one-step pyrolysis of TiO(OH) 2 and (NH 4 ) 2 MoS 4 in LiCl-KCl molten salt. Phase junction is verified at the interface between anatase and rutile TiO 2 , which efficiently enhances spatial charge separation. With further incorporating MoS 2 over TiO 2 to facilitate kinetics of surface redox reactions, the ARM with an optimal MoS 2 weight ratio of 5% exhibits significantly enhanced photocatalytic activity towards solar-driven hydrogen evolution, achieving a hydrogen production rate comparable to the Pt/TiO 2 . The detailed characterization highlights the merits of molten-salt pyrolysis to modulate compositional/structural rationales of photocatalysts utilizing the synergistic effect of anatase/rutile phase junction and surface TiO 2 -MoS 2 heterojunction . The present study provides a facile approach to enable surface and interface engineering in one step.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Luyu Yang,Chuntao Chen,Ying Hu,Feng Wei,Jian Cui,Yuxiang Zhao,Xuran Xu,Xiao Chen,Dongping Sun
Cleaner production of photocatalyst with efficient property and stable reusability is of great importance for the elimination of organic pollutants in wastewater. Herein, we present a bacterial cellulose (BC)-based nanocomposite membrane with enhanced adsorption and photocatalytic degradation for dyes under UV radiation , by using BC nanofibers as a three-dimensional soft template, coated with the polydoamine (PDA) as a functional layer and a protective agent for immobilization of titanium dioxide (TiO 2 ) nanoparticles . Compared with commercial P25, the as-prepared BC/PDA/TiO 2 composite presented higher adsorption capacity for methyl orange, Rhodamine B and methylene blue , and the photocatalytic properties within 30 min after irradiation were further improved. BC/PDA/TiO 2 also showed good stability, proved by the 5.5% reduction in photocatalytic capability after five cyclic tests. We expect our design could provide a facile and green approach with excellent photo-degradation performance for organic pollutants, providing further applications for photocatalysis and wastewater treatment .
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Jinze Lyu,Lele Zhou,Junwei Shao,Zhen Zhou,Junxian Gao,Yuming Dong,Zhenyu Wang,Ji Li
The performances of a photocatalyst in volatile organic compound (VOC) adsorption, photon harvesting, and charge separation largely determine its VOC mineralization efficiency. To simultaneously optimize these properties, this work constructed a hollow heterophase junction by coating anatase TiO 2 hollow spheres with amorphous TiO 2 . Toluene and acetone were selected as model VOC pollutants. Results showed that the amorphous TiO 2 coating increased the content of micropores and mesopores for the photocatalyst, enhanced the adsorption of toluene and acetone, and improved light absorption. The heterophase junction, formed by the external amorphous TiO 2 shell and inner anatase TiO 2 shell, reduced the photon energy required for electron excitation and facilitated charge carrier separation. Given these distinct advantages, the material with the hollow heterophase junction realized efficient mineralization of toluene and acetone.
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POLYMER INTERNATIONAL
·
2019
·Vol. 69
·期 2
·140-148
·
IF 2.433
Jianhua Zhou,Jiaojiao Zhao,Yanjiao Cui,Wenjing Cheng
A novel kind of bifunctional nanoencapsulated phase change material with thermal energy storage and ultraviolet absorption functions was successfully prepared through surfactant-free emulsion polymerization with reactive emulsifiers. These nanocapsules consisted of n-octadecane and n-butyl stearate as binary core materials and polyacrylate supplemented with titanium dioxide nanoparticles (nano-TiO2) as hybrid shell materials. The experimental results show that the monomer conversion and thermal conductivity increased and the particle size and distribution decreased with increase in nano-TiO2 content when the nano-TiO2 dosage was below 0.2 wt%. Fourier transform infrared spectroscopy and XRD confirmed that the binary phase change materials were well encapsulated inside the polyacrylate-TiO2 hybrid shell and nano-TiO2 was also successfully crosslinked in the nanocapsules. TEM demonstrated that the synthesized nanocapsules exhibited a regular spherical profile and a well-defined core–shell structure with diameter ranging from 70 to 100 nm. In addition, the results obtained from DSC, TGA and UV–visible spectrophotometry showed that the as-prepared nanocapsules had good thermal storage capacity, thermal stability and ultraviolet absorption properties. It can be considered that the resultant nanoencapsulated phase change materials with polyacrylate-TiO2 hybrid shell may have high feasibility and hold good promise in the applications of intelligent thermoregulation fabrics. © 2019 Society of Chemical Industry
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RSC Advances
·
2019
·Vol. 9
·期 53
·31177-31185
·
IF 3.049
Shuaiqiang Jia,Jinlong Li,Guozhe Sui,Lijuan Du,Yulin Zhang,Yan Zhuang,Boxin Li
In this study, novel Gd/TiO2@rGO (GTR) nanocomposites with high photocatalytic performance were fabricated via a one-pot solvothermal approach. During the preparation step, graphene oxide (GO) was reduced to reduced graphene oxide (rGO), and subsequently, on the surfaces of which anatase TiO2 doped with Gd metal was grown in situ with a 3D petal-like structure. Gd doping into the classical TiO2@rGO system efficiently expands the absorption range of light, improves the separation of photogenerated electrons, and increases the photocatalytic reaction sites. The specific surface areas, morphological structures, and valence and conduction bands of the obtained GTR nanocomposites were analyzed and correlated with their enhanced photocatalytic performances for the degradation of an aqueous RhB solution. The experimental results indicated that the best performance was achieved with the 3% GTR composite, which exhibited the highest photoelectrocatalytic activity because of two aspects: the rapid separation of electrons and holes, and improvement in adsorption capacity. As compared with pure TiO2, the GTR composites demonstrated enhanced photoactivity due to synergetic effects between the effective photo-induced electron transfer from TiO2 to the surface of the rGO acceptor through interfacial interactions and the variation of structure and electrons under the adoption of Gd.
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Journal of the Taiwan Institute of Chemical Engineers
·
2022
·
IF 5.477
Kaiwen Ni,Yuewang Peng,Geyu Dai,Huawang Zhao,Zhiwei Huang,Xiaomin Wu,Guohua Jing,Wei Feng,Ye Yuan
Background Ammonia bisulfate (ABS) deposition on the active sites of the catalyst surface is the main reason for SO 2 poisoning in low-temperature NH3-selective catalytic reduction (SCR). Accelerated ABS decomposition efficiently enhances the SO 2 resistance. Methods In this work, ceria was specifically chosen to decorate V 2 O 5 -WO 3 /TiO 2 catalyst (Ce-VW/Ti) to activate ABS decomposition in low-temperature NH 3 -SCR. Significant findings The optimal 7Ce-VW/Ti catalyst accelerated the decomposition of ABS and had superior SO 2 tolerance at 250°C. The additive CeO 2 improved the specific surface area and surface acidity, favoring the NH 3 -SCR catalytic activity. ABS was preferentially deposited on the additive CeO 2 on the surface of the 7Ce-VW/Ti catalyst and generated cerium sulfate, eventually protecting the active V 2 O 5 sites and TiO 2 support. Moreover, high quantity of V 5+ and charge transfer between active species V 2 O 5 and support TiO 2 could be maintained due to CeO 2 protection, subsequently maintaining the high NH 3 -SCR performance and enhancing the SO 2 tolerance.
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Catalysts
·
2022
·Vol. 12
·期 11
·1336
·
IF 4.501
Anhua Jiang,Xinwen Huang,Geshan Zhang,Wanquan Yang
In recent years, antibiotics (such as levofloxacin (LEV)) have been detected widely in the environment. Semiconductor photocatalysis has been recognized as a promising technology for removing pollutants in the environment. In this work, nitrogen and carbon codoped titanium dioxide nano-catalyst (NCD-TiO2) was immobilized in polyvinyl alcohol (PVA) matrix to form PVA/NCD-TiO2films through solution casting and thermal treatment, which exhibited good photocatalytic efficiency for LEV degradation. The results showed that about 42% LEV can be degraded after 2 h in the presence of PVA/NCD-TiO2nanocomposite film (the weight ratio of NCD-TiO2to PVA is 8% and thermal treatment is 120 °C) under visible light. Moreover, possible pathways of photocatalytic degradation of LEV according to the detected intermediates are proposed, which provide insight into the degradation mechanism of LEV by using PVA/NCD-TiO2photocatalytic films. Finally, the synthesized PVA/NCD-TiO2films exhibited excellent reusability and stability in photocatalysis. This work provides fundamental support for the design of a high-stability, excellent photocatalyst for practical application.Keywords:levofloxacin;polyvinyl alcohol;visible-light photocatalysis;titanium dioxide;water treatment
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SOLID STATE SCIENCES
·
2026
·
IF 3.6
Xiaohan Du,Chenxi Sun,Chengyang Zhang,Mengmeng Zhen
A hierarchical P-TiO 2 @CNTs heterostructure is fabricated via synergistic defect and architecture engineering. • P-doping in situ triggers abundant oxygen vacancies and optimizes electronic structure for fast Na + transport. • 3D CNT network guides vertical growth of ultrathin TiO 2 nanosheets and suppresses agglomeration. • The P-TiO 2 @CNTs anode exhibits ultra-long cycling stability with 0.019% low-capacity decay rate per cycle after 3000 cycles at 2.0 A g −1 . A hierarchical P-TiO 2 @CNTs heterostructure is rationally designed via synergistic defect and architecture engineering for high-performance sodium-ion batteries. The CNT backbone acts as both a conductive network and a structural template to direct the vertical growth of ultrathin TiO 2 nanosheets, effectively suppressing agglomeration and shortening Na + diffusion paths. P-doping not only induces abundant surface oxygen vacancies to optimize the electronic band structure, and enrich active sites but also modulates lattice interspacing for accelerated Na + diffusion. Benefiting from the synergy of P-doping-triggered vacancies and 3D conductive CNT networks, the P-TiO 2 @CNTs anode delivers exceptional rate capability and ultra-long cycling stability (0.019% low-capacity decay rate per cycle after 3000 cycles at 2.0 A g −1 ). This work provides a universal strategy for integrating defect engineering and hierarchical architecture design to develop advanced TiO 2 -based anodes for high-power and long-life sodium-ion storage. Download: Download high-res image (351KB) Download: Download full-size image
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LANGMUIR
·
2023
·
IF 3.9
Yanru Li,Boyang Guo,Keyan Liu,Kaiyue Li,Jing Song,Cong Wang,Yuchun Wan,Donglai Han,Qian Duan,Shuo Yang
Herein, a series of polyimide (PI)/titanium dioxide (TiO2) organic–inorganic flexible composite microfibers with high photocatalytic performance and good reusability were prepared by combining electrospinning technology and a hydrothermal method. Under simulated sunlight, the photocatalytic characteristics of the as-prepared PI nanofibers, TiO2 nanorods, and PI/TiO2 microfibers were evaluated with photocatalytic degradation of Rhodamine B (RhB) solution. Among the tested samples, PI/TiO2-3 mL hydrochloric acid-160 °C-14 h (PI/TiO-3-160-14) (100%) exhibited a superior photocatalytic degradation rate compared to pure PI (84.0%) and TiO2 (62.2%). The enhancement of the photocatalytic performance was attributed to the Z-scheme heterojunction mechanism. When the interface was irradiated by simulated sunlight, the band edge bending, built-in electric field, and Coulomb interaction synergistically facilitated the separation and transport of electron–hole pairs in the heterojunction. This enhanced the oxidation and reduction abilities of the valence and conduction bands of PI/TiO2. These results were adequately verified by X-ray photoelectron spectroscopy (XPS) analyses and radical trapping experiments. Additionally, PI/TiO2 microfibers also demonstrated excellent photocatalytic activity toward methylene blue (MB, 81.4%), methyl orange (MO, 95.9%), and malachite green (KG, 98.9%), underscoring the versatile applicability of PI/TiO2. Further supplementary investigations illustrated that PI/TiO2 microfibers also possess excellent photostability during our extensive recycling photocatalytic experiments.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Youn-Jun Lee,Yoo Jae Jeong,In Sun Cho,Chang-Gu Lee,Seong-Jik Park,Pedro J.J. Alvarez
To enable the practical use of TiO 2 for photocatalytic water treatment, it is important to understand how dissolved natural organic matter affects its photocatalytic activity and the mechanisms involved in generating reactive oxygen species (ROS). In this study, we systematically investigated the inhibitory effects of humic acids (HA) on 4-chlorophenol (4-CP) degradation using two common TiO 2 crystalline phases (anatase and rutile) individually. HA strongly hindered the photocatalytic activity of anatase, with an R a (the ratio of the first-order rate constant for 4-CP degradation in the absence vs. presence of 30 mg/L HA) of 2.30 (±0.13). This ratio was significantly higher than that of rutile (R r = 1.21 ± 0.08), which was less susceptible to this inhibitory effect and even exhibited improved photocatalytic activity at HA concentrations below 20 mg/L. Similar trends were observed for various HA sources, corroborating the crystalline-phase-dependent effect of HA. Adsorption experiments, Fourier transform infrared spectroscopy, and photoelectrochemical analyses suggested that the adsorption mechanisms and hole-scavenging effect of HA on the two TiO 2 polymorphs did not differ. Importantly, scavenger, probe, and electron spin resonance experiments revealed that the difference in inhibitory effects of HA originate from the distinct ROS generation mechanisms for the two polymorphs. The oxygen reduction pathway for OH generation over anatase was hindered by surface-adsorbed HA, while the water oxidation pathway for OH generation over rutile was less affected. Furthermore, surface-adsorbed HA boosted O 2 − generation on rutile, increasing 4-CP degradation efficiency. This mechanistic insight into NOM-TiO 2 interactions informs materials selection and strategies for higher TiO 2 photocatalytic performance in different water matrices.
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