JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Junjie Ma,Yingguan Xiao,Juanrong Chen,Yue Shen,Sisi Xiao,Shunsheng Cao
Exploring high-performance photocatalysts still remains a big challenge due to poor charge separation efficiency. Herein, we prepare a novel anatase/rutile TiO 2 -Ag 3 PO 4 hollow photocatalyst (A/R-TiO 2 -Ag 3 PO 4 ) for addressing this challenge. Microstructural characterization and photoelectric measurements confirm that the synergy of hollow structure and dual-heterojunction can provide abundant active sites and boost efficient charge separation through dual-pathway charge transfer mechanism. The A/R-TiO 2 -Ag 3 PO 4 photocatalyst exhibits the highest photocurrent density (15.25 µA cm −2 ), which is 8.4 and 5.2 times than that of A-TiO 2 -Ag 3 PO 4 (1.82 µA cm −2 ) and P25-Ag 3 PO 4 (2.93 µA cm −2 ), respectively. Photo-degradation experiment shows that A/R-TiO 2 -Ag 3 PO 4 presents a high degradation percentage (98.7 %) of thiamethoxam (THX) within 30 min, which is 1.45 and 1.23 times than that of A-TiO 2 -Ag 3 PO 4 (68.1 %) and P25-Ag 3 PO 4 (80.7 %), respectively. Furthermore, the degradation percentage of THX by A/R-TiO 2 -Ag 3 PO 4 is as high as 96.4 % after seven successive cycles, indicating excellent cycling stability. Therefore, this work provides a new insight into exploring other high-performance photocatalysts by combining hollow structure and dual-heterojunction.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ju Cheng,Lei Zhang,Weigui Fu,Zihan An,Meixiu Sun,Yiping Zhao,Li Chen
Gelatin, a natural protein, is extensively used in the food, pharmaceutical, and cosmetics industries. However, purifying gelatin to meet the specific requirements of various industries remains a considerable challenge. Ceramic membrane separation technology, renowned for its high permeability, excellent anti-fouling properties, and long lifespan, has been widely applied in the food, biotechnology, and water purification industries. In this study, a sol-gel method was employed to fabricate a gradient multilayer TiO 2 -modified coating on the surface of an α-Al 2 O 3 porous ceramic membrane. The viscosity of the TiO 2 sols was adjusted by varying the concentrations of polyethylene glycol (PEG 2000) and aging times. The results indicated that coating the C-P5^5 composite membrane with a sol containing 5 wt% PEG, aged for different durations (2, 5, 10, 15, and 18 d), effectively reduced the weight-average molecular weight ( M w ) of the permeate from the feed solution of 52.4 kDa–11.9 kDa. However, the C-P10^5 composite membrane, with a 10 wt% PEG content and aged for the same durations, yielded a permeate gelatin M w of 13.6 kDa. The composite membrane with excellent anti-fouling and photocatalytic self-cleaning properties holds promise for innovative applications in gelatin purification and bio-separation processes.
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JOURNAL OF CATALYSIS
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2024
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IF 6.5
Jiahao Wang,Qiliang Gao,Chao Li,Junfeng Zhang,Qingde Zhang,Yizhuo Han
Direct conversion of methanol and acetic acid (HAc) into acrylic acid (AA) and methyl acrylate (MA) is remarkably significant for the high-value utilization of coal-based chemicals. However, the previous catalysts, due to their single function or poor synergy between multiple active sites, remain large challenges in direct synthesis of acrylic acid. Herein, we designed a novel catalyst system through coating TiO 2 to sodium superionic conductor (NASICON) substrate for direct synthesis of acrylic acid from methanol and acetic acid. It was revealed that the catalyst with TiO 2 coating showed obviously improved performance. The selectivity of AA+MA highly reached 56.1 % at 380 °C, corresponding to the spatiotemporal yield of 46.5 μmol·g −1 ·min −1 . It was demonstrated that TiO 2 coating catalyzes the oxidative dehydrogenation of methanol to formaldehyde, while NASICON substrate exerts important effects on the aldol condensation of formaldehyde and acetic acid, and their effective synergy promotes the direct synthesis of acrylic acid.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Lina Yang,Suimin Deng,Hailing Liu,Xiangfeng Wang,Pingye Deng,Yuan Liu,Mengxia Xie
The pollution of water environment resulted from antibiotic abuse and harmful cyanobacteria blooms poses a serious threat to the ecological environment and human health, thus development of effective approaches to degrade and remove these pollutants is crucial to guarantee environmental security. In this work, TiO 2 /Hemin@MAF-7 composites with photo-Fenton-like cascade catalytic degradation activity have been successfully prepared by a self-assembly method. The photocatalysts exhibit high degradation efficiency towards tetracycline antibiotics in water solution under UV light irradiation. Furthermore, the TiO 2 /Hemin@MAF-7 composites have the potential ability to degrade other organic pollutants under the irradiation of visible light. A possible photocatalytic degradation mechanism of the photocatalyst is proposed, which follows a Z-scheme heterojunction type. The introduction of the hemin component into the heterojunction composites significantly promotes the separation of the photo-generated charges on the catalyst, which drives the photo-Fenton-like cascade catalytic cycle degradation reaction. Additionally, the photocatalyst can effectively inhibit the growth of the Microcystis aeruginosa in water environment by damaging the structure of algal cells. This work provides a practical solution for the degradation of antibiotic residues and control of harmful cyanobacteria blooms in wastewaters, and offers a promising strategy for efficiently removing multiple emerging contaminants in water environments.
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Nanoscale Research Letters
·
2011
·Vol. 6
·期 1
·1-15
·
IF 2.56
Wu Wei,Xiao Xiangheng,Zhang Shaofeng,Ren Feng,Jiang Changzhong
Many methods have been reported to improving the photocatalytic efficiency of organic pollutant and their reliable applications. In this work, we propose a facile pathway to prepare three different types of magnetic iron oxides/TiO 2 hybrid nanoparticles (NPs) by seed-mediated method. The hybrid NPs are composed of spindle, hollow, and ultrafine iron oxide NPs as seeds and 3-aminopropyltriethyloxysilane as linker between the magnetic cores and TiO 2 layers, respectively. The composite structure and the presence of the iron oxide and titania phase have been confirmed by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectra. The hybrid NPs show good magnetic response, which can get together under an external applied magnetic field and hence they should become promising magnetic recovery catalysts (MRCs). Photocatalytic ability examination of the magnetic hybrid NPs was carried out in methylene blue (MB) solutions illuminated under Hg light in a photochemical reactor. About 50% to 60% of MB was decomposed in 90 min in the presence of magnetic hybrid NPs. The synthesized magnetic hybrid NPs display high photocatalytic efficiency and will find recoverable potential applications in cleaning polluted water with the help of magnetic separation.
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FOOD CHEMISTRY
·
2024
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IF 8.5
Peilin Wu,Jiwen Fan,Yunze Tai,Xun He,Dongdong Zheng,Yongchao Yao,Shengjun Sun,Binwu Ying,Yao Luo,Wenchuang Hu,Xuping Sun,Yi Li
Developing an accurate, cost-effective, reliable, and stable glucose detection sensor for the food industry poses a significant yet challenging endeavor. Herein, we present a silver nanoparticle-decorated titanium dioxide nanoribbon array on titanium plate (Ag@TiO 2 /TP) as an efficient electrode for non-enzymatic glucose detection in alkaline environments. Electrochemical evaluations of the Ag@TiO 2 /TP electrode reveal a broad linear response range (0.001 mM - 4 mM), high sensitivity (19,106 and 4264 μA mM −1 cm −2 ), rapid response time (6 s), and a notably low detection limit (0.18 μM, S/N = 3). Moreover, its efficacy in measuring glucose in beverage samples shows its practical applicability. The impressive performance and structural benefits of the Ag@TiO 2 /TP electrode highlight its potential in advancing electrochemical sensors for small molecule detection.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei Ji,Yewen Xiao,Feng Xiao,Linlin Li,Minmin Chen,Hualin Wang
Membrane separation technology is a promising alternative for oily wastewater purification. However, developing membrane for the purification of biochemical oily wastewater is still challengeable. To this aim, a novel multifunctional photocatalytic membrane of PTPB-8 is fabricated by sequentially loading of TiO 2 , polydopamine (PDA), and BiOBr onto polyacrylonitrile (PAN) nanofibers in situ . PTPB-8 is of water contact angle (WCA) ∼ 0° and underwater oil contact angle (UOCA) 154.7 ± 2.5°, allowing it with outstanding separation and anti-fouling capability, and good reusability for emulsion separation under gravity (i.e., separation efficiency >90 %, permeation flux >300 L m -2 h −1 , and flux recovery rate >82 % for n-hexane-in-water emulsion after 15 cycles). Under simulated solar light, the ternary heterojunction TiO 2 @PDA@BiOBr is catalytically active with generating active species and the charge transfer pathway follows the mechanism of Z-type heterojunction. Consequently, PTPB-8 can kill E. coli and S. aureus by ∼ 100 % and degrade tetracycline by >90 %. The application trial results have demonstrated the great potential of PTPB-8 in the purification of biochemical oily wastewater containing bacteria and antibiotics. This study will also give a new idea for enhancing the photocatalytic activity of heterojunctions by PDA decoration.
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ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 24
·2001604
·
IF 16.836
Lingxia Zheng,Xiaolei Deng,Yongzhi Wang,Jiaxin Chen,Xiaosheng Fang,Liang Wang,Xiaowei Shi,Huajun Zheng
A novel inorganic–organic heterojunction (TiO 2 /P3HT (poly(3-hexylthiophene)) is easily prepared by a combination of anodization and vacuumed dip-coating methods, and the constructed flexible fibrous photodetector (FPD) exhibits high-performance self-powered UV–visible broadband photoresponse with fast speed, high responsivity, and good stability, as well as highly stable performance at bending states, showing great potential for wearable electronic devices. Moreover, Au nanoparticles are deposited to further boost the responsivity and selectivity by regulating the sputtering intervals. The optimal Au/TiO 2 /P3HT FPD yields an ≈700% responsivity enhancement at 0 V under 350 nm illumination. The sharp cut-off edge and high UV–visible rejection ratio (≈17 times higher) indicate a self-powered flexible UV photodetector. This work provides an effective and versatile route to modulate the photoelectric performance of flexible electronic devices.
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Journal of Cleaner Production
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2024
·
IF 9.7
Taotao Cai,Ying Zhang,Shili Zheng,Peiyi Yan,Yi Zhang
Titanium is a highly valued material. Developing a lower-cost titanium (Ti) metal powder production process, potentially substituting the conventional Kroll-HDH method, has challenged the titanium community for decades. The ease of aluminum forming alloys with titanium and the strong chemical affinity of titanium to oxygen rule out the possibility of fabricating pure Ti metal directly by aluminum reduction of TiO 2 . Based on the demonstrated enhanced deoxidation of Ti using Mg metal, this paper proposes an Al–Mg combined stepwise reduction of TiO 2 to fabricate Ti metal powder. Critical challenges overcome in this research include predicting reaction thermodynamics and preparing Ti 2 O intermediate by Al reduction of TiO 2 without significant Al alloying, which is made possible by forming mild-acid soluble Ca 12 Al 14 O 32 Cl 2 byproduct. Various Al reduction conditions were investigated and optimized. To the best of our knowledge, it is the first report to fabricate Ti 2 O powder by Al reduction of TiO 2 with a highly stable chemical composition. The difficulty of sintering the Ti 2 O intermediate before Mg deoxidation to reduce the surface oxygen contribution is mitigated by mixing a certain amount of low-oxygen titanium powder with the Ti 2 O powder. This allows the densification temperature to be lowered from 1400 °C for sintering pure Ti 2 O powder to 1100 °C. Even with as much as around 15 wt% oxygen, the sintered powder can be effectively deoxidized by Mg with the help of hydrogen. A titanium metal powder with an oxygen content of 0.134 wt%, an Al content of 0.123 wt%, and other impurities meeting the standard of pure titanium metal powder (GB/T 34486-2017 FTA1) is successfully prepared by the Al reduction-Mg deoxidation combined process. It is a promising alternative for producing titanium metal powder and its derivatives.
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Photonics and Nanostructures-Fundamentals and Applications
·
2025
·
IF 2.9
Xin Li,Yangyang Guo,Huibing Mao,Ye Chen,Jiqing Wang,Weifeng Fang
The TiO 2 :Eu 3+ inverse opals have the anatase structure and can be analyzed approximately by the two-dimensional photonic crystal. The emission spectra of the Eu 3+ ions in the TiO 2 :Eu 3+ inverse opal demonstrate that the inverse opal has significant manipulation effect on the emission of the Eu 3+ ions. With the polystyrene (PS) microsphere size of 300 nm, the emission intensity ratio of the magnetic dipole transition 5 D 0 → 7 F 1 to the electric dipole transition 5 D 0 → 7 F 2 increases by about 4.9 times in the TiO 2 :Eu 3+ inverse opal in comparison with the reference TiO 2 :Eu 3+ nanomaterials sample, meanwhile the electric dipole emission 5 D 0 → 7 F 4 at 695 nm also increases significantly. With the deviation of the PS microsphere size, the above manipulation effect also decreases. The theoretical analysis implies that the above manipulation is mainly due to the forbidden photonic band of the TE mode in the TiO 2 :Eu 3+ inverse opal, which results in the decrease of the electric local density of state in the forbidden photonic band and the decrease of the emission 5 D 0 → 7 F 2 , on the contrary, the corresponding emissions 5 D 0 → 7 F 1 and 5 D 0 → 7 F 4 will increase.
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Environmental Technology & Innovation
·
2024
·
IF 6.7
Renhua Zheng,Diwen Jia,Haiqin Yang,ZhiYuan Chen,Jiayi Chen,Jingle Chen,Haichang Guo,Cheng Hu,Huali Chen,Ting Wang
To achieve the effective removal of low-concentration antibiotic pollutants present in seawater, floating photocatalytic spheres loaded with ytterbium-doped titania-loaded reduced graphene oxide (Yb-doped TiO 2 /RGO) as active catalytic components were prepared and tested for the degradation of tetracycline (TC) in simulated seawater. Three solvothermal reduction processes were employed to promote TiO 2 crystallization in the Yb-doped TiO 2 /RGO powder catalyst prepared via adsorption-layer nanoreactor synthesis, while simultaneously achieving the surface modification of the GO carrier in the active component. Doping with Yb and reduction reaction during solvothermal treatment converted a small amount of Ti 4+ ions in TiO 2 into Ti 3+ and introduced a low content of lattice oxygen vacancies, which extended the visible light response region of Yb-doped TiO 2 /RGO. Under weak visible light excitation, the three Yb-doped TiO 2 /RGO samples and their corresponding polyurethane (PU) sponge-filled photocatalytic spheres could effectively degrade TC in simulated seawater, with the highest degradation rates of 92 % (within 5 h) for the powder active component and 81 % (within 15 h) for the photocatalytic floating spheres. Use of ethanol and ethylene glycol as solvents led to the significant reduction in the hydrophilic groups of the Yb-doped TiO 2 /RGO powder active component after heat treatment, effectively enhancing their TC adsorption performance in seawater. The eco-friendly PU sponge-filled photocatalytic spheres presented in this study exhibit a promising potential for effective removal of organic pollutants from seawater.
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ChemNanoMat
·
2024
·Vol. 10
·期 7
·e202400053
·
IF 2.6
Yuqian Fei,Zizhuo Nie,Shujiang Ding,Jiuhong Wang,Wei Yu,Na Li,Yuhang Liu,Bo Peng,Xiaoli Feng,Limin Liu,Xinbing Jiang
Gas sensors for ammonia (NH 3 ) play a crucial role in the maintenance of air quality, preservation of the atmosphere, and evaluation of human health. However, the endeavor to attain a high level of sensitivity in detecting NH 3 under ambient conditions remains a challenging task. In this work, poly(3-hexylthiophene)s and titanium dioxide (P3HT-TiO 2 ) heterostructure NH 3 gas-sensitive material was prepared, and by drop-casting the material onto a substrate with Au interdigital electrodes, a sensor for high-response detection of NH 3 at room temperature was constructed. The designed gas sensor exhibited a high response signal of 114.61 % toward 15 ppm NH 3 at room temperature (25 °C) with good reproducibility, strong long-term stability, and excellent selectivity. Moreover, by analyzing the response law of the sensor under different humidity conditions, it has been noted that both excessively high and excessively low levels of humidity adversely affect the sensor's response. The remarkable increase in NH 3 sensing properties is attributed to the synergistic enhancement effect of P−N heterojunction formed between P3HT and TiO 2 . This NH 3 gas sensor exhibits tremendous potential for use due to its straightforward structure and outstanding ammonia sensing performance.
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