APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Xinjuan Du,Jindou Hu,Jing Xie,Aize Hao,Zhenjiang Lu,Yali Cao
The convenient modification of transition metal and the simultaneous adjustment of energy band are effective measures to improve the photocatalytic activity of titanium dioxide but remains challenging in photocatalytic hydrogen evolution field. Herein, In(OH) 3 -TiO 2 heterostructures were constructed by solid-state synthetic strategy under room temperature for tuning the band structure and accelerating the photoexcited charge separation to enhance the photocatalytic activity for hydrogen evolution. By the quantified modification of In(OH) 3 , the obtained In(OH) 3 -TiO 2 delivers an appreciable photocatalytic activity and stability for hydrogen evolution, which is 15.7 folds superior to commercial P25. Due to the narrowed band gap, the increased charge carrier density, the restrained recombination rate of photoexcited electron-hole pairs and the accelerated photogenerated charge separation, the In(OH) 3 -TiO 2 heterostructures thereby achieve the boosted photocatalytic hydrogen evolution performance. This work provides a feasible strategy to enhance the photocatalytic hydrogen evolution of TiO 2 via tuning the band gap and accelerating the photoinduced charge separation.
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JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Lingqiao Kong,Jingyuan Qiao,Qiushi Ruan,Hui Wang,Xufeng Xi,Wenwen Zha,Zhenghua Zhou,Wei He,Wei Zhang,ZhengMing Sun
Photochemical-assisted rechargeable batteries are suffering from a high charge potential due to unfavorable surface charge kinetics of photochemical electrodes, that is surface defects induced energy loss . In this work, in-situ growing thickness-controlled polymer nanolayer on TiO 2 nanorods electrode by a facile solvothermal reaction optimizes surface states conditions via mitigating oxygen vacancy induced hole trapping agents, while polymer nanolayer creates abundant active surface states that efficiently extract holes for photooxidation reaction. For modified photoelectrodes , 8 times improvement in interfacial charge transfer/recombination ratio (K t /K r ) at a low applied bias contributes to a low onset potential (0.2 V vs. RHE) for photooxidation and shows 12 times improvement in photocurrent density at 0.4 V vs. RHE under simulated sunlight irradiation (AM 1.5 G, 100 mW cm −2 ) than that of r-TiO 2, which contributes to the superior performance of a photochemical-assisted rechargeable Zn-air battery (PZAB). Equipping such a photoelectrode can photo-charge the battery at 10 mA cm −2 with a record-low potential of 0.8 V, saving 76.5% electrical energy. The electrode shows excellent stability for a 10-h cycling test. This work provides scientific thoughts and synthetic strategies for a highly efficient solar-rechargeable electric energy storage system and expands the scope of application for conjugated polymers .
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Wen Luo,Jing Rong,Wanxia Zhao,Keke Kang,Lulu Long,Xiaojiang Yao
CeO 2 –TiO 2 catalysts with four different morphologies were successfully synthesized by a hydrothermal method and tested for selective catalytic reduction of NO x with NH 3 (NH 3 –SCR). For the four catalysts, CeO 2 –TiO 2 nanocubes (CT–NC) and nanorods (CT–NR) preferentially exposed {1 0 0} and {1 1 0} facets, respectively; furthermore, nanosheets (CT–NS) and nanospheres (CT–NH) mainly exposed {1 1 1} facet. Interestingly, CT–NH catalyst showed the best NH 3 –SCR performance and the NO x conversion exceeded 97% at 325 °C. Through a series of characteristic methods manifested that the short–range ordered structure of Ce–O–Ti in CT–NH catalyst provided stronger surface acidic sites to promote the high–temperature activity. Moreover, the abundant Ce 3+ species and appropriate reduction ability on {1 1 1} facet of CT–NH catalyst also caused outstanding de NO x activity. Reaction mechanism study showed that the Langmuir–Hinshelwood (L–H) mechanism and Eley–Rideal (E–R) mechanism existed simultaneously on all catalysts in NH 3 –SCR reaction. Meaningfully, two types of E–R mechanism were present on CT–NH catalyst, while L–H mechanism was dominant.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Ruili Li,Guoqing Xiao,Chunlin Chen,Chunyan Chen,Shuyi Shang,Yuanyuan Li,Zhengwei Yang,Qian Liu
Textile wastewater pollution with dyes has become a major source of water pollution. In the study, GO and composite nanospheres (CNS@LDH and HOTiO 2 ) were used to form the composite materials by electrostatic self-assembly method, and the composite materials vacuum filtration on the surface of CA membrane to prepare the composite membranes for dyes separation. Among them, GO was used as a vertical separation layer in dyes separation, while the hollow structure of HOTiO 2 nanosphere with a large specific surface area provided more adsorption sites, and the CNS@LDH nanosphere with core–shell structure played the role of expanding GO sheets and preventing HOTiO 2 from collapsing. Compared with the GO membrane, the water flux of three dyes produced by GO/HOTiO 2 /CNS@LDH composite membrane increased by 18 times with a rejection rate of 99%. In addition, after 10 cycles of experiments, GO/HOTiO 2 /CNS@LDH composite membrane retained a rejection rate of over 98% with the flux of 79 L∙m −2 ∙h −1 ∙bar −1 for MB. GO/HOTiO 2 /CNS@LDH composite membrane retained a stable rejection rate on three dyes under extreme pH and ionic strength conditions. The composite membrane combined the adsorption and isolation effects of GO, HOTiO 2 , and CNS@LDH, which significantly enhanced the separation performance of dye wastewater. Accordingly, the GO/HOTiO 2 /CNS@LDH composite membrane has great potential in practical wastewater treatment.
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Bioactive Materials
·
2022
·
IF 16.874
Ting Dai,Wenming He,Shuangshuang Tu,Jinru Han,Bo Yuan,Chenyang Yao,Wenzhi Ren,Aiguo Wu
Given that apoptosis increases the risk of plaque rupture, strategies that reduce intracellular lipid levels without killing foam cells are warranted for safe and effective treatment of atherosclerosis. In this study, a mild phototherapy strategy is carried out to achieve the hypothesis. Foam cell-targeted nanoprobes that allow photothermal therapy (PTT) and/or photodynamic therapy (PDT) were prepared by loading hyaluronan and porphine onto black TiO 2 nanoparticles. The results showed that when temperatures below 45 °C, PTT alone and PTT + PDT significantly reduced the intracellular lipid burden without inducing evidently apoptosis or necrosis. In contrast, the use of PDT alone resulted in only a slight reduction in lipid levels and induced massive apoptosis or necrosis. The protective effect against apoptosis or necrosis after mild-temperature PTT and PTT + PDT was correlated with the upregulation of heat shock protein 27. Further, mild-temperature PTT and PTT + PDT attenuated intracellular cholesterol biosynthesis and excess cholesterol uptake via the SREBP2/LDLR pathway, and also triggered ABCA1-mediated cholesterol efflux, ultimately inhibiting lipid accumulation in foam cells. Our results offer new insights into the mechanism of lipid regulation in foam cells and indicate that the black TiO 2 nanoprobes could allow safer and more effective phototherapy of atherosclerosis.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 2
·027504
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IF 4.386
Zaiqiong Liu,Jinpeng Tao,Zhenyu Zhu,Yanli Zhang,Hongbin Wang,Pengfei Pang,Haibo Wang,Wenrong Yang
An ultrasensitive electrochemical assay for T4 polynucleotide kinase (T4 PNK) activity and inhibition was developed based on magnetic Fe3O4@TiO2 core–shell nanoparticles and gold nanoparticles hybrid probe (Fe3O4@TiO2-dsDNA-AuNPs) modified magnetic gold electrode (MGE). Fe3O4@TiO2-dsDNA-AuNPs hybrid probe was formed via DNA hybridization between phosphorylated DNA S1 modified Fe3O4@TiO2 and complementary DNA S2 assembled AuNPs. [Ru(NH3)6]3+ was used as an electrochemically active indicator to enhance the electrochemical signal. The proposed method is sensitive for T4 PNK activity assay with a linear range of 0.0001 to 10 U ml−1 and low detection limit of 0.00003 U ml−1. This strategy can be used to screen the T4 PNK inhibitors, holding a great potential for discovery of nucleotide kinase-target drug and early clinical diagnosis of cancer.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 7
·4482-4496
·
IF 2.779
Wang Tao,Ding Huihui,Xiao Huan,Sun Tianyi,Xu Jiahui,Zhang Zhengmei,Bian Haiqin,Li Shuang,Zhang Hengyang
In this article, P-g-C 3 N 4 /TiO 2 (the protonated g-C 3 N 4 is noted as P-g-C 3 N 4 ) heterojunction photocatalytic materials with hollow sphere structure were synthesized mainly by high-temperature calcination and secondary hydrothermal methods. To obtain highly efficient heterojunction catalytic materials with more uniform surface compounding, we protonated and exfoliated ultrasonically the obtained g-C 3 N 4 before compounding further, which changed its morphology while retaining its semiconductor properties and optical band gap unchanged, and finally obtained the ultra-thin nanoflake structures. On this basis, an optimal proportion of the highest catalytic activity between these two substances was explored by degrading RHB. It was found that the highest catalytic activity of the complexes was achieved at 110 min with a weight ratio of 0.1 of P-g-C 3 N 4 to TiO 2 after protonating under the same conditions, and complete degradation was reached at 110 min. Afterward, to further investigate its physicochemical properties, we made various characterizations and proposed a suitable catalytic mechanism of Z-scheme regarding its excellent catalytic properties.
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Polymers
·
2023
·Vol. 15
·期 9
·2077
·
IF 5
Longfei Zhang,Ying Wang,Limin Peng,Zhilin Chen,Shaoyi Lyu,Siqun Wang
Long-term relief of indoor volatile pollution has become a competitive issue worldwide in both visible and dark environments. A novel self-luminous wood coating with carbon dots (CDs)/titanium dioxide (TiO2) nanomaterial coated SrAl2O4: Eu2+, Dy3+(CDs/TiO2@SAO) composite was prepared for the long-term degradation of formaldehyde through a simple sol-gel method. The microstructure, chemical composition, ultraviolet-visible (UV-vis) spectra, and long-lasting fluorescence of the CDs/TiO2@SAO photocatalyst were analyzed to illustrate the mechanism for degrading formaldehyde. The obtained CDs with a particle size of ~2–7 nm have a good graphite structure and presented good absorption in visible light. In addition, owing to the synergistic effect of the CDs/TiO2nanomaterial coating layer and the long-afterglow luminescence of the SAO phosphor, the CDs/TiO2@SAO composite can absorb a part of the visible light for photocatalytic degradation and store luminous energy efficiently at daytime so as to give out visible luminescence continuously for a few hours in the darkness. Furthermore, the functional wood coatings with CDs/TiO2@SAO composite presented continuous and efficient photocatalytic activity in the presence and absence of light exposure. The current research could provide a new strategy for designing an efficient photocatalyst for degrading formaldehyde pollution in the daytime with a visible light supply and in an indoor dark environment without an external light source.Keywords:carbon dots;core-shell microspheres;SrAl2O4: Eu2+, Dy3+phosphor;titanium dioxide;surface modification;photocatalytic degradation
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Jiasheng Wang,Qingrong Wang,Mengdi Zhao,Ming Bao
Toluene gas-phase oxidation is a green, chlorine-free production process for benzaldehyde but its conversion efficiency is still unsatisfying due to the lack of highly efficient catalyst. Here the selective oxidation of toluene to benzaldehyde over V-Ag-Ce/TiO 2 under an air atmosphere was investigated. The catalyst was prepared by impregnation and characterized by scanning electron microscope (SEM), N 2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Electron paramagnetic resonance (EPR), H 2 temperature programmed reduction (H 2 -TPR), O 2 temperature programmed desorption (O 2 -TPD), and NH 3 temperature programmed desorption (NH 3 -TPD). The amount of oxygen vacancy and acid of the catalyst can be tuned through adjusting the V:Ag:Ce ratio. Over the optimum catalyst (V:Ag:Ce = 4:2:1, molar ratio), 92% benzaldehyde selectivity with a 27% toluene conversion can be obtained at 550 °C. Medium amounts of oxygen vacancy (0.43) and acidity (0.10 mmol/g) are found to be conducive to the conversion of toluene to benzaldehyde. This study has important theoretical guiding significance for improving conversion efficiency from toluene to benzaldehyde by gas-phase aerobic oxidation.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Jialin Jia,Stefanos Giannakis,Dong Li,Boyin Yan,Tao Lin
A novel catalytic system for effective photocatalytic inactivation of Escherichia coli ( E. coli ) was constructed by anchoring Ag nanoparticles (AgNPs) on silane coupling agent (SCA) pretreated TiO 2 nano-tube arrays (Ag/SCA/TiO 2 NTAs). Morphology and structural analyses revealed that SCA could disperse AgNPs evenly on TiO 2 NTAs, thus inducing a superior surface plasmon resonance (SPR) effect. Ag/SCA/TiO 2 NTAs catalyst exhibited excellent inactivation performance when in the presence of peroxymonosulfate (PMS) and visible light (VL), with 6-log E. coli was completely inactivated within 60 min, which was 5.3, 12.5 and 13.2 times higher than that of Ag/SCA/TiO 2 NTAs/VL, PMS/VL and Ag/SCA/TiO 2 NTAs/PMS/dark systems, respectively. Additionally, the photocatalyst exhibited a highly reusable property, with the inactivation performance almost unchanged after ten cycles of uses with minimal Ag leaching. The inactivation mechanism analysis demonstrated that both radical (SO 4 •- , OH) and non-radical (h + , 1 O 2 ) pathways involved in E. coli inactivation, and SCA played a pivotal role in the production of reactive species. Chloride ions (Cl − ) greatly enhanced the inactivation efficiency, while bicarbonate (HCO 3 − ) and phosphate (H 2 PO 4 − ) showed an inhibitory effect. Humic acid (HA) displayed a dual effect on inactivation performance, where the low concentration of HA facilitated the bacteria inactivation, while the higher dose suppressed bacteria inactivation. Moreover, the system exhibited excellent inactivation performance in tap water . This work first used SCA as the binder to fix AgNPs on TiO 2 NTAs for VL photocatalytic inactivation of bacteria with the assistance of PMS, which was expected to provide some insights into the practical treatment of drinking water .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xinsheng Tang,Xiong Liu,Fangfei Liu,Tursun Abdiryim,Ruxangul Jamal,Nawrzhan Serkjan,Shuyue Xie,Cong Xue,Qian Cheng
Pyro-phototronic effect plays an important role in improving the photodetection performance of ultraviolet (UV) photodetectors (PDs). Here, a novel pyro-phototronic effect between TiO 2 nanoarrays (TiO 2 NRs) and the conducting polymer poly(3,4-ethylenedioxy selenophene) (PEDOS) is applied to fabricate a self-powered UV PD with the enhanced photodetection ability. The self-powered p-n heterojunction UV PD is fabricated by a face-to-face hybrid of acid (HCl and H 2 SO 4 )-treated TiO 2 NRs with PEDOS. Interestingly, a pyro-phototronic effect is found between TiO 2 NRs/FTO and PEDOS/FTO, and the acid treatment of TiO 2 NRs can dramatically enhance the pyro-phototronic effect. H 2 SO 4 treatment can improve the p-n heterojunction, while HCl treatment can increase carrier concentration due to the introduction of surface oxygen vacancies on the surface of TiO 2 NRs. Under UV light illumination and 0 bias voltage, the rise time (T rise ) and fall time (T fall ) of UV PD from the face-to-face hybrid of PEDOS/FTO with TiO 2 (HCl)/FTO are 0.080 s and 0.079 s, while the responsivity (R) and detectivity (D*) are 58.706 mA/W and 3.627 × 10 11 Jones, respectively. The face-to-face fabrication of UV PDs and the matching of the energy levels between PEDOS and TiO 2 NRs cause the pyro-phototronic effect due to temperature change and pyroelectric effect of TiO 2 NRs under the UV light illumination. This work gives a new idea to generate pyro-phototronic effect between TiO 2 NRs and conducting polymers for application in UV PDs field.
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THIN SOLID FILMS
·
2023
·
IF 2.1
Tingting Wang,Longhua Li,Zhaolu Yin,Shaoyong Chen,Junli Wang
Semiconductor-sensitized TiO 2 thin films have been widely applied in optoelectronic devices. Here we prepared narrow bandgap (∼1.77 eV) selenium (Se)-sensitized TiO 2 thin films by spin-coating of Se inks onto a TiO 2 mesoporous layer, which forms a p-Se/n-TiO 2 heterojunction interface and holds promise for self-driven visible-light detection and sensing. Under irradiation by simulated sunlight and monochromatic visible-light, the resultant films exhibit large on-off switch ratio, fast response speed, and high spectral responsivity and detectivity at zero bias. Meantime, the p-Se/n-TiO 2 films show notable photoresponse stability and can maintain 92% and 64% of photocurrent of the pristine device after 2-month air storage and 72 h water soaking, respectively. Such good oxygen and moisture resistance of Se/TiO 2 thin films would be promising as applied in environmentally-stable heterojunction optoelectronic devices.
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