Environmental Science-Nano
·
2021
·Vol. 9
·期 1
·133-144
·
IF 8.131
Jingjing Du,Wenrui Qv,Gaozhong Pu,Mingxiang Qv,Jin Zhang,Wenfang Zhang,Hongzhong Zhang
Most intensively studied nanoparticles (NPs) possess photocatalytic activity. However, knowledge of the ecotoxicity of TiO2 NPs in response to the natural photoperiod remains scarce. To increase our understanding of the phototoxicity of TiO2 NPs toward aquatic fungal communities, regarding their structure and functioning, a microcosm experiment was conducted involving narrow-leaf cattail (Typha angustifolia) leaf decomposition with TiO2 NPs (50 mg L−1) under different light conditions (visible light, UV light, and the natural photoperiod) for 214 days. Although different light conditions led to significant variations in leaf decomposition, the decomposition rate was not significantly affected by TiO2 NP exposure under either visible or UV light, and it even increased by 15.19% under the natural photoperiod. During the ecological process, significant decreases were observed in the fungal biomass, overall microbial activity, and some extracellular enzymatic (cellobiohydrolase and polyphenol oxidase) activities. Also, TiO2 NPs under visible light and UV light reduced the fungal community diversity and led to the selection of some tolerant fungal species (e.g., Anguillospora longissima) that performed poorly in leaf decomposition under chronic exposure. The information provided here will help us to deeply evaluate the ecotoxicity of nanoparticles on freshwater ecosystem functioning under ambient light conditions.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Xiang Qin,Rong Cao,Wensheng Gong,Liping Luo,Guojun Shi,Lijun Ji,Aiping Zhu
ZnCdS/TiO 2 /Na-MXene composites were prepared by a hydrothermal process to obtain an excellent photocatalyst with photo-corrosion resistant property. Under hydrothermal conditions, the surface of Ti 3 C 2 MXene was wrapped by Na + and ZnCdS nanoparticles , which slowed down the further oxidation of Ti 3 C 2 MXene into TiO 2 and improved the utilization rate of MXene. The adsorption capacity of an optimal ZnCdS/TiO 2 /Na-MXene composite to methylene blue reached 299.68 mg/g, confirming a higher MXene content was important for photocatalytic degradation of an organic dye. The basal distance of the MXene layers increased from 10.59 Å to 15.21 Å due to the intercalation of ZnCdS, which could facilitate the transportation and adsorption of organic pollutant in ZnCdS/TiO 2 /Na-MXene. The total removal efficiency was 9.3 times that of ZnCdS in 120 min. When the composites were used for photocatalytic hydrogen production , a relatively higher ZnCdS content was necessary. The hydrogen conversion efficiency of an optimal ZnCdS/TiO 2 /Na-MXene composite under visible light irradiation reached 8436.58 μmol·g −1 ·h −1 , which was 3.3 times that of ZnCdS. The ZnCdS/TiO 2 /Na-MXene composites showed excellent and stable photocatalytic activity in recycling experiments, confirming their excellent photo-corrosion property. These ZnCdS/TiO 2 /Na-MXene composites showed great potential in the application of photocatalytic degradation and hydrogen production, and provided a new way to reduce the oxidation process of Ti 3 C 2 MXene.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Hai Yu,Miao Zhang,Jianguo Lv,Yanfen Wang,Lei Yang,Yanmei Liu,Qian Gao,Gang He,Zhaoqi Sun
In this study, we fabricated TiO 2 nanorod arrays (TiO 2 ), which were decorated with AgVO 3 quantum dots (QDs) on and a layer of V 2 O 5 film, forming a heterojunction material for removal pollutants and photoelectrochemical (PEC) water splitting. The AgVO 3 /V 2 O 5 -TiO 2 nanorod arrays (AgVO 3 /V 2 O 5 -TiO 2 ) synthesized by the secondary hydrothermal method were grown on conductive glass to form one-dimensional (1D) nanorod and p-n junction structures. Through experimental characterisation and testing, optical, morphological photocatalysis and PEC characteristics of the materials were measured and studied. The TiO 2 modified with AgVO 3 and V 2 O 5 can significantly improve the visible light optical absorption, the reduce the electron-hole pair binding rate and shorten the band gap (3.07–1.41 eV) of TiO 2 . The resulting photocurrent density (116 uA/cm 2 ) and photodegradation efficiency (rate constant, k = 0.025 min −1 ) of AgVO 3 /V 2 O 5 -TiO 2 are approximately 20 (6 uA/cm 2 ) and 5 times (0.005 min −1 ) higher than those of bare TiO 2 , respectively. The AgVO 3 /V 2 O 5 -TiO 2 achieved a current density of 10 mA at an overpotential of 246.2 mV and exhibited excellent oxygen evolution reaction (OER) performance. The systematic PEC experiments concluded that the optimized of the TiO 2 interface by AgVO 3 and V 2 O 5 could promote the separation and transport of charge carriers.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Mengxiang Liu,Kaifu Yang,Jiale Fan,Kaibo Yu,Zihan Kong,Tao Zhang,Xiaoxiao Huang
Al 2 O 3 -mediated interface engineering builds multifunctional MXene composites. • Heterogeneous interfaces regulate dielectric response and thermal insulation. • Optimized composite achieves −62.76 dB RL min with excellent thermal insulation. Developing lightweight multifunctional materials that integrate efficient microwave absorption and thermal insulation remains a significant challenge for advanced electromagnetic protection applications. Herein, Al 2 O 3 -mediated MXene-derived TiO 2 /N-doped carbon composites (AMNC) were engineered via a facile freeze-drying/thermal treatment strategy. During fabrication, in situ generated Al 2 O 3 nanorods established abundant heterogeneous interfaces with MXene-derived TiO 2 and the N-doped carbon framework, constructing a hierarchical interface architecture that effectively regulated dielectric behavior. The synergistic effects of enhanced interfacial polarization, optimized conductive networks, and improved impedance matching endowed the AMNC composites with superior electromagnetic wave attenuation capability. The optimized AMNC-1 achieved a minimum reflection loss (RL min ) of −62.76 dB at a thickness of 2.43 mm and a maximum effective absorption bandwidth (EAB max ) of 5.12 GHz at only 1.88 mm. The corresponding specific reflection loss values (SRL l and SRL lt ) reached 313.80 and 129.14, respectively, demonstrating excellent lightweight microwave absorption capability. Furthermore, CST simulations revealed a radar cross-section reduction of 34.62 dB m 2 under normal incidence, indicating promising radar stealth capability. Owing to the interconnected porous structure and Al 2 O 3 -mediated heterogeneous interface architecture, AMNC-1 exhibited excellent thermal insulation performance, maintaining a surface temperature of only 51.5 °C after heating on a 100 °C hot plate for 30 min. This work highlights the critical role of Al 2 O 3 -mediated heterogeneous interfaces in tailoring dielectric response and thermal insulation behavior, providing a rational strategy for designing lightweight multifunctional composites with synergistic electromagnetic absorption and thermal insulation performance. Download: Download high-res image (204KB) Download: Download full-size image
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ACS Omega
·
2026
·
IF 5.2
Panpan Xu,Xiaole Qiu,Bing Sun,Li Sun,Ensi Cao,Wentao Hao
Abstract Colossal permittivity (In,Nb) codoped TiO2 ceramics are promising for microelectronic applications but suffer from high low-frequency dielectric loss primarily due to leakage currents across grain boundaries. This work demonstrates that Zr4+ doping at Ti-sites in (In0.5Nb0.5)0.05Ti0.95O2 effectively mitigates this issue. A series of (In0.5Nb0.5)0.05Ti0.95-xZrxO2 (x = 0–0.20) ceramics were synthesized via solid-state reaction. Zr4+ incorporation refines grain size from ∼56.1 μm (undoped) to ∼2.5 μm (x = 0.20) and promotes the precipitation of an insulating ZrTiO4 secondary phase at grain boundaries for compositions with x ≥ 0.10. These microstructural modifications synergistically enhance the grain boundary resistance, which peaks at 10.50 × 106 Ω·cm for the x = 0.10 composition, nearly an order of magnitude higher than the undoped ceramic. Consequently, the low-frequency dielectric loss is significantly reduced, with the x = 0.10 composition sintered at 1450 °C exhibiting a minimal loss tangent. Complex impedance analysis reveals the introduction of a new interfacial polarization associated with the ZrTiO4/INTO phase boundaries. XPS analysis confirms that Zr doping suppresses oxygen vacancy concentration without altering the Ti3+/Ti4+ ratio crucial for electron-pinned defect dipoles. The optimized composition (x = 0.10) also shows improved nonlinear coefficient (α = 2.8) and breakdown field (Eb = 530 V/cm), alongside stable low loss (tanδ < 0.05) over a broad temperature range at 1 kHz. This study presents a viable defect-engineering strategy utilizing Zr4+ doping to achieve low-loss colossal permittivity in (In,Nb) codoped TiO2-based ceramics for practical applications.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Bin Xu,Maohua Hou,Qinqin Xu,Jieying Su,Haitao Zhang,Xiaohui Lu,Zhongjin Ni
In recent years, artificial amorphous photonic structure (APS) materials with high color saturation and angle independence have been competitively reported. However, there is a lack of research into their functionalization and application in practical environments. Here, with practical applications in mind, we prepared APS pigments based on CB@SiO2@TiO2 core–bishell nanospheres and demonstrated high color saturation, enhanced color stability, and excellent photocatalytic activity. SiO2 effectively protected the carbon black particles from ablation during the calcination process. Paints composed of ethanol, ethyl cellulose (EC), and pigments could be spray-coated on any substrate to prepare a structurally colored coating without limitation. The coatings show good mechanical stability and photothermal stability. The color of the structurally colored pigments can be easily changed by adjusting the sizes of the CB@SiO2@TiO2 nanospheres. The photocatalytic activity of the pigments on formaldehyde (HCHO) and methylene blue (MB) solution and reaction kinetics of their degradation were studied by experiment. The results showed that the photocatalytic activity of the pigments increased with the increase of the TiO2 loading, and the degradation rate of HCHO reached 96.7% for 3 h and that of MB reached 97.9% for 60 min when the TiO2 shell thickness was 40 nm. The structurally colored pigments based on CB@SiO2@TiO2 nanospheres effectively solve the environmental problems caused by the application of pigments and have a promising future in the fields of color decoration, display, and painting.
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PubMed
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ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Chenxiao Zhang,Lihong Nie,Jiafan Wang,Beifu Wang
In this work, a new type of composite nanoparticles, ‘pearl chain’, was developed by linking titanium dioxide and silicon dioxide by polyacrylic acid polymer chains, and the prepared TiO2-PAA-SiO2 composite nanoparticles were analysed by SEM, Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy and thermogravimetric analysis, zeta potential, x-ray diffraction, etc. The success of this work was verified by the successful linking of TiO2-PAA-SiO2 composite nanoparticles.TiO2-PAA-SiO2 composite nanoparticles were analysed to verify the successful attachment of pearl chains. The obtained TiO2-PAA-SiO2 were subsequently blended in different ratios to prepare polyvinylidene fluoride (PVDF) ultrafiltration membranes. The membrane performance was tested by porosity and water contact angle measurements, scanning electron microscopy, as well as experiments using bovine serum proteins and MTBE interception. The results showed that when a certain amount of TiO2-PAA-SiO2 was added, the surface wettability, porosity and permeability of the prepared modified composite membranes were significantly improved, and the BSA adsorption rate was increased from 71.59% to 80.86%, and the retention rate of MTBE was increased by 77%, in addition to showing a better anti-pollution effect (FRR: 91.07%). It was finally concluded that the prepared membranes embedded with 1.0 wt.% TiO2-PAA-SiO2 nanofillers showed good overall filtration performance, better contamination resistance and remarkable durability. The present work successfully demonstrated the feasibility of using polyacrylic acid chemical chains to connect nanoparticles with different functions to prevent particle loss and substantially enhance membrane performance, which is valuable for bridging connection of composite nanoparticles and exploring the development of high-performance ultrafiltration membranes.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Ruyan Xie,Yanhua Song,Fangke Wang,Jingyao Li,Xiaozhen Zhang,Haifeng Zou
Ultrasensitive detection and degradation of tetracycline (TC) has gained increasing attention owing to their inevitable detriments to human and ecosystem. Many studies have focused on mono-functional detection or degradation. However, the design of multi-functional materials is still a challenge. Till now, a novel protocol applied to the consecutive detection and complete degradation of TC are rarely successfully reported. Herein, we not only developed a multi-mode optical carbon dots (CDs) for ultra-sensitive sensing, but also further manufactured CDs/TiO 2 photocatalyst that can degrade TC 100 %, completely eliminating the TC for the first time. The as-prepared CDs can selectively detect TC with low detection limit of 5.2 nM and 10.7 nM within only 40 s, accompanied by wide linear interval of 1.0–50.0 μM and 50.0–250.0 μM, respectively. Therefore, the fabricated point-of-care testing platform can realize “in-situ” visual detection rapidly and efficiently. Furthermore, a highly active CDs/TiO 2 photocatalyst was prepared by rationally modifying CDs on TiO 2 and exhibited almost 100 % degradation behavior towards TC within 70 min. The mechanism of fluorescence quenching and photocatalysis were lucubrated. Notably, our proposed protocol can drive consecutive detection and elimination towards tetracycline, which powerfully reduces the potential harm and provides a new strategy for the eradication of pollutants.
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Polymers
·
2023
·Vol. 15
·期 21
·4308
·
IF 5
Kai Jiang,Jiang Li,Margaret Brennan,Charles Brennan,Haiyan Chen,Yuyue Qin,Mingwei Yuan
The aim of this study was to prepare a novel pH-sensitive smart film based on the addition of purple garlic peel extract (PGE) and TiO2nanoparticles in a sodium alginate (SA)/polyvinyl alcohol (PVA) matrix to monitor the freshness of beef. FT-IR spectroscopy revealed the formation of stronger interaction forces between PVA/SA, PGE, and TiO2nanoparticles, which showed good compatibility. In addition, the addition of PGE improved the tensile strength and elongation at break of the composite film, especially in different pH environments, and the color response was obvious. The addition of 1% TiO2nanoparticles significantly improved the mechanical properties of the film, as well as the light barrier properties of the film. PGE could effectively be uniformly dispersed into the composite film, but it also had a certain slow-release effect on the release of PGE. PGE had high sensitivity under different pH conditions with rich color changes, and the color showed a clear color change from red to yellow-green when the pH increased from 1 to 14. The same change was observed when it was added to the film. In particular, by applying this film to the process of beef preservation, we judged the freshness of beef by monitoring the changes in the TVB-N value and pH value during the storage process of beef and found that the film showed obvious color changes during the storage process of beef, from blue (indicating freshness) to red (indicating non-freshness), and finally to yellow-green (indicating deterioration), which indicated that the color change of the film and the freshness of the beef maintained a highly consistent.Keywords:smart packaging;anthocyanins;color response;beef freshness;indicator film
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Huan Cheng,Kuang Luo,Xiaojun Wen,Jie Yang,Jumei Li
The development of sensitive, reliable, and robust substrates for surface-enhanced Raman spectroscopy (SERS) heavily relies on the creation of numerous hot spots. In this study, we propose a simple approach to fabricate core-satellite composites composed of AgTNP@TiO 2 @Ag, where Ag triangular nanoplates (AgTNPs) act as the cores, TiO 2 serves as the interlayer, and Ag nanoparticles are deposited around them to form Ag satellites. By adjusting the amount of AgNO 3 , we precisely control the coverage of Ag nanoparticles on AgTNP@TiO 2 @Ag, thus fine-tuning their SERS sensitivity. Various characterization techniques were employed to examine their composition, morphology, and crystal structure. Thanks to the abundant hot spots created by the Ag satellites, these composites exhibit significantly enhanced SERS sensitivity and they demonstrate the capability to detect methylene blue (MB) at a concentration of 10 −10 M by portable Raman spectrometer. Moreover, the AgTNP@TiO 2 @Ag composites effectively enable in situ SERS monitoring of the photodegradation reaction of MB. Overall, the novel AgTNP@TiO 2 @Ag composites prepared in this study exhibit high SERS sensitivity and excellent photocatalytic performance, making them highly valuable for environmental detection and ecological restoration purposes.
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DESALINATION
·
2023
·
IF 9.9
Jing Song,Yihan Li,Shihan Wang,Rui Han,Yu Ba,Ying Liu,Shengqiang Fan
Membrane Electro-Bioreactor (MEBR), with dual function of electrochemical in-situ membrane fouling mitigation and pollutants removal by chlorine evolution reaction (CIER), has emerged as a promising technology of treating mariculture wastewater. However, the fouling control mechanism regarding extracellular polymeric substance (EPS) variations and related microbial community is still unclear. In this study, MEBR was developed with conducting anode-membrane modified by CNTs-TiO 2 -PEDOT for fouling resistant and ammonia/nitrite removal. The CIER electroactivity was enhanced that onset potential negatively shifted from 1.12 to 0.98 V vs. SCE (saturated calomel electrode). Ammonia removal rate (71.49 mgN/(L·day)) was 176.8 % higher and nitrite was significantly reduced in MEBR than MBR at HRT of 45 min. Membrane fouling was mitigated in MEBR that operation duration was extended by 40 % compared with MBR. The EPS of cake layer on the membrane surface rather than the biofilters was found the main fouling contributor. The significant reduction in LB-EPSp (65.4 %) in MEBR (33.8 % in MBR) was the dominant factor contributing to membrane fouling alleviation, which highly depended on the relative abundance of Hyphomonas and Hirschia . This study will be beneficial for fouling control in seawater treatment.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Haihong Wang,Huiyan Ma,Yan Li,Lin Cheng,Jucai Yang,Juming Liu
Efficient, low-cost, and easily scalable wide-spectral-responsive TiO2 photocatalysts are still extremely desired in driving photocatalytic degradation toward practical applications. In this work, a modified TiO2 with a narrow band gap and low valence band (VB) (CC-OV-TiO2) was successfully synthesized based on a facile sol–gel and low-temperature carbonization process, which can be used for the photocatalytic degradation and mineralization of a wide range of phenols. The results show that the interstitial doping of carbonates and the modification of surface oxygen vacancy (OV) defects together contribute to the formation of the VB tail states, which substantially narrow the band gap of TiO2 and widen the photoresponse range. Meanwhile, the carboxylated carbon species induce a substantial downward shift of the VB edge through coordination of the electron-withdrawing carboxyl groups, which further enhances the oxidation ability of the photogenerated holes. Accordingly, CC-OV-TiO2 with a narrow band gap and low VB exhibits superior and stable photocatalytic performance.
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