VACUUM
·
2023
·
IF 4
Zihan Wang,Xiaoqing Ma,Qiaodan Li,Xinyao Tian,Jilei Si,Mauricio A. Melo
Photoelectrochemical (PEC) water splitting is a viable method for converting renewable solar energy into storable chemical energy. Herein, the newly emerged two-dimensional sp- and sp 2 -carbon hybridized graphyne sheets were successfully coupled with thin film-like arrays of titanium dioxide nanorods , forming an efficient 2D-1D heterojunction . The microstructure and composition of obtained γ-graphyne/TiO 2 films were well characterized. And enhanced photoelectrochemical properties were demonstrated. The γ-graphyne/TiO 2 photoelectrode achieves a photocurrent density of 1.31 mA/cm 2 at 1.23 V ( vs. RHE), which is 1.7 times over that of pristine titanium dioxide. An improvement of photoconversion efficiency by 2.2 folds was observed. The high PEC activity of γ-graphyne/TiO 2 originates from band alignment and interfacial junction between π-conjugated graphyne sheets and TiO 2 nanostructure , greatly promoting charge transfer and diminishing defective excitation and recombination. By virtue of the γ-graphyne nanosheets , largely increased number of useful photons and catalytic active sites are triggered. This work provides a reference for the photoelectrochemical application of semiconductive γ-graphyne and a specific and proven method for the utilization of solar energy.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhen Wang,Jianping Xu,Shaobo Shi,Jing Chen,Jianghua Xu,Lina Kong,Xiaosong Zhang,Lan Li,Shougen Yin
One-dimensional (1D) metal oxides with excellent carrier transport and light absorption properties can be applied to photodetectors (PDs), facilitating device miniaturization, portability, and integration. Surface modification of 1D semiconductors can reduce carrier recombination in PDs as a way to increase photocurrent and decrease dark current of PDs. Herein, ultrathin BaTiO3 (BTO) shell layers are grown on the surface of TiO2 nanorod arrays (NRs) by in situ conversion using hydrothermal reaction, and the self-powered TiO2-BTO NRs PDs are constructed. The effect of the thickness of BTO shell layers on the photoresponse characteristics of self-powered TiO2-BTO NRs PDs is investigated by controlling the Ba2+ conversion concentration. The results show that the BTO shell layer reduces the dark current of the PDs because of the decreased interfacial transfer resistance and improved transfer of photogenerated carriers for building a “bridge” of carrier transport between BTO and TiO2 due to the formation of Ti–O–Ti bonds. Moreover, the presence of the spontaneous polarization electric field in BTO enhances the photocurrent and response speed of PDs. The self-powered TiO2-BTO NRs PDs are integrated in series and parallel to realize the functions of “and” and “or” gates of light-controlled logic gates. The ability to convert light signals into electrical signals for the self-powered PDs in real time demonstrates its great potential for optoelectronic interconnection circuits, which has important application prospects in the field of optical communication.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 17
·6187
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IF 4.6
Le Xu,Jiateng Chen,Pengcheng Zhao,Boxiong Shen,Zijian Zhou,Zhuozhi Wang
To promote the practical application of TiO2in photocatalytic toluene oxidation, the honeycomb aluminum plates were selected as the metal substrate for the loading of TiO2powder. Surface-etching treatment was performed and titanium tetrachloride was selected as the binder to strengthen the loading stability. The loading stability and photocatalytic activity of the monolithic catalyst were further investigated, and the optimal surface treatment scheme (acid etching with 15.0 wt.% HNO3solution for 15 min impregnation) was proposed. Therein, the optimal monolithic catalyst could achieve the loading efficiency of 42.4% and toluene degradation efficiencies of 76.2%. The mechanism for the stable loading of TiO2was revealed by experiment and DFT calculation. The high surface roughness of metal substrate and the strong chemisorption between TiO2and TiCl4accounted for the high loading efficiency and photocatalytic activity. This work provides the pioneering exploration for the practical application of TiO2catalysts loaded on the surface of metal substrate for VOCs removal, which is of significance for the large-scaled application of photocatalytic technology.
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JOURNAL OF COORDINATION CHEMISTRY
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2023
·
IF 1.9
Yanbing Yin,Yang Liu,Zhou Wang,Yongming Feng,Bei Jiang
A ternary composite α-DMACoPc/UiO-66-NH2/TiO2 was synthesized by solvothermal method and characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM) and other means. The composite catalyst was applied to decompose methylene blue dye in visible light, and the degradation rate reached 93.4%. Compared with the monomer, the composite significantly enhanced the efficiency of the catalytic degradation due to the synergistic effect between composites. The transport speed of charge is accelerated and the recombination of hole-electron pairs is inhibited due to the larger specific surface area. A feasible scheme was provided for preparation of composite catalyst and photocatalytic degradation of dye.
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Materials
·
2023
·Vol. 16
·期 14
·5137
·
IF 3.4
Yanling Jin,Jiayi Wang,Xin Gao,Fang Ren,Zhengyan Chen,Zhenfeng Sun,Penggang Ren
Titanium dioxide (TiO2) is an ideal photocatalyst candidate due to its high activity, low toxicity and cost, and high chemical stability. However, its practical application in photocatalysis is seriously hindered by the wide band gap energy of TiO2and the prone recombination of electron-hole pairs. In this study, C, N doped TiO2were supported on spent coffee grounds-derived carbon (ACG) via in situ formation, which was denoted as C, N–TiO2@ACG. The obtained C, N–TiO2@ACG exhibits increased light absorption efficiency with the band gap energy decreasing from 3.31 eV of TiO2to 2.34 eV, a higher specific surface area of 145.8 m2/g, and reduced recombination rates attributed to the synergistic effect of a spent coffee grounds-derived carbon substrate and C, N doping. Consequently, the optimal 1:1 C, N–TiO2@ACG delivers considerable photocatalytic activity with degradation efficiencies for methylene blue (MB) reaching 96.9% within 45 min, as well as a high reaction rate of 0.06348 min−1, approximately 4.66 times that of TiO2(0.01361 min−1). Furthermore, it also demonstrated greatly enhanced photocatalytic efficiency towards methyl orange (MO) in the presence of MB compared with a single MO solution. This work provides a feasible and universal strategy of synchronous introducing nonmetal doping and biomass-derived carbon substrates to promote the photocatalytic performance of TiO2for the degradation of organic dyes.Keywords:titanium dioxide;spent coffee grounds–derived carbon;C, N doping;photocatalytic degradation;organic dyes;dye mixture
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 14
·2125
·
IF 5.3
Tingting Hu,Panpan Feng,Liping Guo,Hongqi Chu,Fusheng Liu
A series of Ti2O3@TiO2core-shell heterojunction composite photocatalysts with different internal electric fields were synthesized using simple heat treatment methods. The synthesized Ti2O3@TiO2core-shell heterojunction composites were characterized by means of SEM, XRD, PL, UV–Vis, BET, SPV, TEM and other related analytical techniques. Tetracycline (TC) was used as the degradation target to evaluate the photocatalytic performance of the synthesized Ti2O3@TiO2core-shell heterojunction composites. The relevant test results show that the photocatalytic performance of the optimized materials has been significantly enhanced compared to Ti2O3, while the photocatalytic degradation rate has increased from 28% to 70.1%. After verification via several different testing and characterization techniques, the excellent catalytic performance is attributed to the efficient separation efficiency of the photogenerated charge carriers derived from the built-in electric field formed between Ti2O3and TiO2. When the recombination of electrons and holes is occupied, more charges are generated to reach the surface of the photocatalyst, thereby improving the photocatalytic degradation efficiency. Thus, this work provides a universal strategy to enhance the photocatalytic performance of Ti2O3by coupling it with TiO2to build an internal electric field.Keywords:photocatalysis;Ti2O3@TiO2core-shell heterojunction;built-in electric field
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ACS ES&T Engineering
·
2023
·
IF 7.1
Yuqing Su,Zhen Yu,Ruonan Gu,Wei Wu,Shaoling Dai,Shaoan Cheng
Blue TiO2 exhibited excellent electrocatalytic activity for degrading various organic pollutants in wastewater. However, its crystal structure and morphology considerably affected the electrocatalytic activity of blue TiO2. In this study, a blue hierarchical TiO2 nanotube array (B-HTNA) was synthesized utilizing Ti foam by ice–water bath anodic oxidation and cathodic reduction. Benefiting from a higher concentration of doped Ti3+, the prepared B-HTNA exhibited greater electron transport capability. B-HTNA effectively degraded tetracycline with a high removal rate of more than 90% within 60 min under 20 mA cm–2. The results of free radical quenching experiments revealed the effects induced under different experimental conditions, wherein the electrochemical oxidation of pollutants with B-HTNA mainly relied on the oxidation of hydroxyl radicals. In addition, B-HTNA exhibited a longer service life of up to 85.4 h, surpassing other anodes with a bare and fragile nanotube array. B-HTNA displayed enhanced stability owing to the hierarchical structure with uniform nanoparticles adhering to a porous layer, which could prevent chemical erosion of the anode and charge leakage from the top of the nanotube during cathodic polarization, thereby enhancing self-doping and stability.
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CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Han Zhang,Xuan Wang,Hao Ding
Herein, SiO 2 -TiO 2 composite (STC) photocatalysts were prepared through placing SiO 2 microspheres in TiOSO 4 solution and calcining at high temperature. Using STC (containing only 5.09 wt% TiO 2 ), the degradation rate to MO with a concentration of 10 ppm was 100% at 50 min of UV illumination. The cost of the photocatalyst and the cleanliness of the preparation process were ensured due to the use of TiOSO 4 as the titanium source and the water as the solvent. Therefore, not only the photocatalytic effect and application performance of TiO 2 were improved, but realized the cleanliness of the preparation process and reduced the cost.
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CHINESE JOURNAL OF CATALYSIS
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2023
·
IF 16.5
Defa Liu,Bin Sun,Shuojie Bai,Tingting Gao,Guowei Zhou
Solar-powered semiconductor photocatalysis is considered a powerful strategy for addressing environmental pollution and energy crisis. Nevertheless, the separation and transfer abilities of photogenerated photocatalysts remain unsatisfactory. Herein, dual Ti 3 C 2 nanosheets/Ag co-catalysts synergistically decorated hierarchical flower-like TiO 2 microspheres for boosting photocatalytic H 2 production were fabricated by electrostatic self-assembly and subsequent photoreduction procedures. The optimal Ag/Ti 3 C 2 /TiO 2 composite demonstrated an excellent photocatalytic H 2 -production rate of 1024.72 μmol g −1 h −1 under simulated solar irradiation, achieving nearly 40, 2.3, and 1.8 folds with respect to that obtained on pristine TiO 2 , optimized Ti 3 C 2 /TiO 2 composite, and Ag/TiO 2 composite, respectively. The considerably improved photocatalytic H 2 -production activity is associated with the synergistic effect of the hierarchical flower-like structure of TiO 2 , excellent electrical conductivity of Ti 3 C 2 , and surface plasmon resonance effect of Ag, which enhances the light absorption capacity and promotes the separation and transfer of photogenerated carriers. This study provides insight into the design of high-efficiency photocatalysts with dual co-catalysts for solar H 2 production.
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JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Liyong Ding,Yukun Zhao,Youji Li,Chengsheng Ge,Liang Lv,Hongwei Ji,Wenjing Song,Chuncheng Chen,Jincai Zhao
During TiO 2 -based photocatalysis, the presence of water usually leads to the unselective degradation of organic compounds due to the uncontrollable formation of water-derived radical species. Here we report that the presence of water dramatically enhances the selectivity in photocatalytic oxidation of sulfides to sulfoxides over TiO 2 . H 2 18 O-isotope labelling experiments reveal that both O 2 and H 2 18 O contribute to the oxygen atoms in the formed sulfoxides and sulfones. Moreover, at the beginning of the oxidation of sulfides, water serves as the main source of the oxygen atom, while the contribution of O 2 increases with the irradiation time. We uncover two roles of water in sulfides oxidation: to act as oxygen source in the oxidation of sulfides to sulfoxides; to provide protons to inhibit the further oxidation of sulfoxides. This study deepens our understanding of roles of water in photocatalytic oxidation of sulfides and offers a new strategy to optimize photocatalytic selective oxidation .
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 13
·10594
·
IF 5.6
Zanlin Chen,Haiming Li,Miaojia Xie,Fengguang Zhao,Shuangyan Han
This study proposes a label-free aptamer biosensor for the sensitive detection of malachite green(MG) using gold nanoparticles/multi-walled carbon nanotubes @ titanium dioxide(AuNPs/MWCNTs@TiO2). The nanocomposite provides a large surface area and good electrical conductivity, improving current transfer and acting as a platform for aptamer immobilization. The aptamer and the complementary chain(cDNA) are paired by base complementary to form the recognition element and fixed on the AuNPs by sulfhydryl group, which was modified on the cDNA. Since DNA is negatively charged, the redox probe in the electrolyte is less exposed to the electrode surface under the repulsion of the negative charge, resulting in a low-electrical signal level. When MG is present, the aptamer is detached from the cDNA and binds to MG, the DNA on the electrode surface is reduced, and the rejection of the redox probe is weakened, which leads to an enhanced electrical signal and enables the detection of MG concentration by measuring the change in the electrical signal. Under the best experimental conditions, the sensor demonstrates a good linear relationship for the detection of MG from 0.01 to 1000 ng/mL, the limit of detection (LOD)is 8.68 pg/mL. This sensor is stable, specific, and reproducible, allowing for the detection of various small-molecule pollutants by changing the aptamer, providing an effective method for detecting small-molecule pollutants.Keywords:aptamer;cyclic voltammetry;potassium hexacyanoferrate;sensitive detection;differential pulse voltammetry
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Haibo Yin,Junyang Zhang,Yunlong Wang,Xiaoguang Zhao,Yakun Qu,Yue Peng,Hexing Li,Yuning Huo,Junhua Li
Photocatalytic membrane reactor (PMR), coupling photocatalysis and membrane separation , has shown a considerable potential in foulant removal. However, the serious membrane fouling and fragile membrane stability still limit the application of current PMR systems. Here, we report a strategy that PdCu alloy deposited on TiO 2 , which is incorporated with polyvinylidene fluoride membrane, achieves high humic acid (HA) rejection efficiency (100%) with enhanced membrane permeation and anti-fouling performance. Detailed characterizations demonstrate that alloying effect of PdCu-TiO 2 plays multiple roles in improving PMR performance: (1) providing the paired Pd-Cu sites for enhancing HA adsorption and transferring electrons from Pd-Cu sites to HA to improve photocatalytic HA removal; (2) inducing the photothermal effect due to the carrier damping, which directly enhances membrane permeation. The remarkable properties of PdCu-TiO 2 membrane in PMR confirm the significance of alloying effect for treating aqueous organic pollutants .
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