查找使用阿拉丁产品的科研文献

Visible light-mediated degradation of benzo(a)pyrene in smoked sausages by liposome-encapsulated hydrogenated TiO₂: insights into mechanisms and pathways

Jingnan Lu,Manzi Hu,Xingguang Chen,Ziyan Li,Wen Nie,Kezhou Cai,Baocai Xu

This study aims to explore the control and degradation of benzo( a )pyrene (B( a )P) in smoked sausages through photocatalysis. Experimental results indicate that TH@CS-LDO-Lip (Hydrogenated TiO 2 -coated Carbon Sphere-Layered Double Oxide-Liposome) significantly improves the light energy utilization efficiency and enhances the separation of photogenerated charge carriers. The film fabricated based on TH@CS-LDO-Lip effectively reduced B( a )P levels in smoked sausage by 67.1 %–68.7 % ( P  < 0.05). After 10 min of visible light irradiation, the degradation rate of B( a )P adsorbed onto the film increased to 70.4 %–81.5 % ( P  < 0.05). Cytotoxicity analysis revealed that treatment with B( a )P significantly reduced cell viability to 45.2 % and proliferation rate to 52.1 %. In contrast, cells treated with the B( a )P degradation solution (D-B( a )P) exhibited a viability of 96.8 % and a proliferation rate of 90.64 %. The barrier structure formed by liposomes and nanotubes effectively minimized direct contact between the catalyst and sausage, thereby providing a safe strategy for the control of B( a )P.

Eco-friendly TiO₂/rice bran wax/chitosan films and their application as fruit coatings: Characterization and UV-responsive ethylene scavenging function

Xiaojun Fu,Ke Wang,Jingxin Chen,Yonghong Ge,Danshi Zhu,Jianrong Li,Bin Liu,Hongbo Mi

With the escalating environmental concerns associated with non-biodegradable, petroleum-derived materials, the development of eco-friendly coating alternatives has become imperative to replace conventional commercial fruit waxes, such as morpholine-emulsified formulations. This study presented the development and characterization of a composite film composed of titanium dioxide (TiO₂), rice bran wax (RW), and chitosan (CHI), and evaluated the potential of its emulsion as a postharvest coating for fruit preservation. The TiO₂/RW/CHI film exhibited enhanced mechanical and thermal performance, including improved tensile strength and thermal stability, particularly at 0.07% TiO₂. In addition, the film with 0.09% TiO₂ demonstrated favorable water solubility, as evidenced by a contact angle of 38.4°, indicating ease of cleaning from fruit surfaces. Notably, the TiO₂/RW/CHI coating can effectively promote the oxidative degradation of ethylene under ultraviolet irradiation, thereby reducing weight loss, maintaining lower soluble solids content, and delaying textural softening of cherry tomatoes during storage. These results suggest that the TiO₂/RW/CHI emulsion coating is a promising eco-friendly alternative for extending the shelf life and maintaining the quality of postharvest fruits.

Strengthening the metal-support interaction over Pt/SiO2-TiO(OH)2 by defect engineering for efficient dehydrogenation of dodecahydro-N-ethylcarbazole

Zhuwei Yang,Xiang Gong,Linsen Li,Zhao Jiang,Riguang Zhang,Tao Fang

Liquid organic hydrogen carriers (LOHC) are considered as the promising candidates for large-scale hydrogen storage. The N -ethylcarbazole/dodecahydro- N -ethylcarbazole (NECZ/12H-NECZ) system has received increasing attention due to its excellent comprehensive properties in the hydrogen storage candidates. In this work, the Pt/SiO 2 -TiO(OH) 2 catalysts are synthesized and show good activity, selectivity and stability for 12H-NECZ dehydrogenation reaction. Among them, the 2.5 wt% Pt/SiO 2 -TiO(OH) 2 catalyst shows the best dehydrogenation performance with 5.75 wt% H 2 release amount and 98 % selectivity of NECZ. Combined with XRD, HRTEM, ATR-FTIR, XPS and EPR analysis, it is found that the oxygen vacancy concentration in Pt/SiO 2 -TiO(OH) 2 is significantly enhanced due to the formation of Si-O-Ti species compared with Pt/SiO 2 and Pt/TiO(OH) 2 , which strengthens the SMSI (strong metal-supporting interaction) effect between metal Pt and support SiO 2 -TiO(OH) 2 . The optimized d-band center of catalyst is beneficial for accelerating the sluggish kinetics of the rate-limiting step of the whole dehydrogenation reaction. Furthermore, compared with the results by replacing SiO 2 with Al 2 O 3 or CeO 2 , it is indicated that the introduction of oxides mainly plays the role of regulating the surface electronic state of TiO(OH) 2 and increasing the oxygen vacancy concentration.

Construction of OTAB/Bt/TiO2 Composite Photocatalysts to Improve the Adsorption and Photocatalytic Performance for SCN− Removal

Wang Tingting,Zhang Lucheng,Zhang Mingqing,Yang Fang,Wu Shilong

The widespread use of cyanidation in gold beneficiation leads to a large amount of SCN − in the gold extract tail solution, which poses a threat to the environment and human health. The present study successfully synthesized octadecyltrimethylammonium bromide/bentonite/titanium dioxide (OTAB/Bt/TiO 2 ) photocatalysts through a sol–gel hydrothermal approach. Evaluation of the BET specific surface area, X-ray diffraction (XRD) analysis, UV–vis diffuse reflectance spectroscopy, and zeta potential experiments unveiled the beneficial impact of incorporating OTAB. This inclusion led to an enlargement of the pore size and layer spacing of Bt, broadening the range of photoresponses. Additionally, it effectively neutralized the negative charge residing on the surface of Bt. Consequently, these enhancements contributed to the improved performance of the photocatalytic material in terms of adsorption and catalytic degradation of SCN − . The degradation rate of SCN − reached 98.78% under the reaction conditions of initial SCN − concentration of 50 mg/L, OTAB/Bt/TiO 2 dosage of 0.8 g/L, pH = 8, and reaction time of 300 min. The degradation of the SCN − composite through the OTAB/Bt/TiO 2 photocatalytic process followed a zero-order kinetic model with a calculated rate constant ( k value) of 0.1148 min −1 . Notably, this rate constant was 1.9 times greater than the degradation rate observed in the pure TiO 2 system. The free radical quenching test showed that h + , ∙OH and ∙O 2− were the main oxidizing substances for photocatalytic degradation. The identification of intermediates proved that the complete mineralization of SCN − could be achieved by OTAB/Bt/TiO 2 adsorption and photocatalytic degradation without generating the highly toxic intermediate CN − . Overall, this study provides guidance for the development of more photocatalysts with strong adsorption properties and more effective removal of SCN − from gold extraction tailings.

Effects of TiO2 nanoparticles and electrodes surface-modified by low-temperature plasma on impulse breakdown voltage of propylene carbonate

Shilin Wu,Qing Yang,Tao Shao,Zhaotian Zhang

Thermoplastic polyurethane/titania/polydopamine (TPU/TiO 2 /PDA) 3-D porous composite foam with outstanding oil/water separation performance and photocatalytic dye degradation

Cui Zhixiang,Marcelle Sansi seukep alix,Zhao Mingliang,Wu Jiahui,Liu Xianhu,Si Junhui,Wang Qianting

With the rapid development of the chemical industry, large amounts of industrial organic pollutants have constituted a huge threat to the ecological environment. The 3-D porous TPU/TiO 2 /PDA composite foam with outstanding oil/water separation and photocatalytic performances was successfully prepared. Its morphology, chemical composition, surface wettability, mechanical properties, oil/water separation, and photocatalytic performances had been systematically studied by SEM, FTIR, XRD, XPS, Raman, XPS, TGA, contact angle instrument, and ultraviolet spectrophotometer. The results showed that TPU/TiO 2 /PDA composite foam can remove water and oil for various oil/water mixtures and emulsion with outstanding separation performance only under the gravitational force. The water and oil separation flux can reach 21,035 L/m 2 ·h and 14,500 L/m 2 ·h, respectively. The highest separation efficiency reach to 99.6% for petroleum ether/water. It also can continuously separate the oil and water from various water/oil mixtures with the assistance of the pump; after 10 cycles, it maintains large separation efficiency of 98.5%. Moreover, the RhB removal rate reached up to 96% only after irradiation 1 h under UV light. These results manifested that the prepared multifunctional TPU/TiO 2 /PDA composite foams have great application prospect in oil/water separation fields, providing a new idea for fabricating 3-D porous composite foams with multifunctionality. A novel type of 3-D porous TPU/TiO 2 /PDA composite foam with multifunctional applications was successfully designed and prepared. It exhibits excellent performance for oil/water separation and photocatalytic degradation of organic dye. Graphical abstract

Gelatin-oxidized dextran Schiff base hydrogel with MXene@TiO₂ and GHK-Cu: A multifunctional dressing for photothermal-antibacterial and pro-angiogenic wound repair

Shunyu Chen,Mengting Lei,Pei Liu,Xiufeng Xiao

Chronic wound healing is often impaired by persistent pathogenic infection, excessive oxidative stress, and insufficient angiogenic drive. In this study, a multifunctional injectable hydrogel dressing (Gel/ODex/MT/GHK-Cu) was developed based on a dynamic chemical network to accelerate skin tissue regeneration through the synergistic effects of photothermal antibacterial therapy and biochemical signaling. The system utilizes dynamic Schiff base crosslinking between gelatin (Gel) and oxidized dextran (ODex) as the structural framework, integrating MXene@TiO 2 (MT) heterojunction nanosheets and copper peptide (GHK-Cu) as functional units. Results demonstrated that the hydrogel possessed excellent rheological properties, self-healing capacity, and tissue adhesiveness (with adhesion strength sufficient to withstand various skin movements), with a swelling ratio exceeding 200% for effective exudate management. Under 808 nm near-infrared (NIR) irradiation, the MT heterojunction nanosheets exhibited significant photothermal conversion capability, raising the local temperature above 45 °C within 15 min, achieving efficient ablation (>99%) of Staphylococcus aureus and Escherichia coli through the synergy of hyperthermia and the physical-mechanical disruption of bacterial membranes. Meanwhile, the sustained release of Cu 2 + from GHK-Cu provided outstanding antioxidant activity and significantly enhanced the migration of human umbilical vein endothelial cells. In vivo evaluations in a mouse full-thickness skin defect model confirmed that the hydrogel combined with NIR treatment significantly shortened wound closure time and promoted re-epithelialization, collagen deposition, and the formation of functional hair follicles. By establishing an integrated platform for physical protection, precise ablation, and bio-inspired repair, this study offers a promising advanced strategy for the clinical management of chronic infected wounds. Download: Download high-res image (126KB) Download: Download full-size image A multifunctional injectable hydrogel dressing was developed via Schiff base crosslinking of gelatin and oxidized dextran, incorporating MXene@TiO₂ nanosheets and GHK‑Cu. The hydrogel shows excellent photothermal antibacterial activity, anti-inflammatory effect, and sustained Cu²⁺ release to promote angiogenesis and L929 cell proliferation. Combined with NIR irradiation, the hydrogel significantly accelerates full‑thickness wound healing in mice by enhancing re‑epithelialization, angiogenesis, collagen deposition, and hair follicle regeneration.

Enhanced and stable high-temperature microwave absorption via the construction of a three-dimensional TiO₂ porous network structure in Sc₂Si₂O₇ ceramics

Zhiyong Chen,Yuxiang Lai,Siyu Chen,Donghong Wang,Lu Tang,Jimei Xue,Zhijun Wang,Ying Li,Hanjun Wei

Fabricating inorganic ceramics with stable high-temperature electromagnetic (EM) attenuation properties via the construction of three-dimensional (3D) nanofiber networks continues to pose significant challenges. In this work, the dielectric properties and microwave attenuation performance were significantly enhanced through the precise morphological and architectural control of a 3D TiO₂ nanowire (TiO₂ nws) network within Sc₂Si₂O₇, which was achieved by modulating the sintering temperature during coprecipitation and sintering. The TiO 2 nws/Sc₂Si₂O₇ (ST-800, sintered at 800 ℃) exhibited excellent microwave absorption properties, with a minimum reflection loss (RL min ) of –21.45 dB at 2.25 mm and an effective absorption bandwidth (EAB) reaching 3.7 GHz at a matching thickness of 2.55 mm. The radar cross-section significantly decreased by 17.28 dB·m² at 0°. Moreover, ST-800 has a broad temperature range from 100 600 °C, with an RL below –20 dB, an EAB exceeding 3.8 GHz, and a matching thickness of less than 2.75 mm. This stable and excellent microwave absorption performance at elevated temperatures can be attributed to the well-maintained impedance matching behavior, along with the synergistic compensation between the polarization loss and conduction loss across a broad temperature range. These findings provide valuable guidance for the development of high-temperature stable EM wave absorbing materials.

Solution-derived poly(ethylene glycol)-TiO x nanocomposite film as a universal cathode buffer layer for enhancing efficiency and stability of polymer solar cells

Yin Zhigang,Zheng Qingdong,Chen Shan-Ci,Li Jiaxin,Cai Dongdong,Ma Yunlong,Wei Jiajun

Highly efficient and stable polymer solar cells (PSCs) have been fabricated by adopting solution-derived hybrid poly(ethylene glycol)-titanium oxide (PEG-TiO x ) nanocomposite films as a novel and universal cathode buffer layer (CBL), which can greatly improve device performance by reducing interface energy barriers and enhancing charge extraction/collection. The performance of inverted PSCs with varied bulk-heterojunctions (BHJs) based on this hybrid nanocomposite CBL was found to be much better than those of control devices with a pure TiO x CBL or without a CBL. An excellent power conversion efficiency up to 9.05% under AM 1.5G irradiation (100 mW·cm −2 ) was demonstrated, which represents a record high value for inverted PSCs with TiO x -based interface materials.

Construction of a multilayer structured separation membrane based on TiO₂/ZIF-8 and CS-SDAEM polymer brush with enhanced self-cleaning and antifouling performance

Heran Zhao,Yan Zhao,Huiliang Zhang,Junjia Bian,Zhixin Zhang,Baochang Jin,Mingyu Wang,Hongwei Pan,Yuqin Ma,Jingxuan Zhao

Multilayer PVDF membrane with TiO₂/ZIF-8 and CS-SDAEM brush. • Superhydrophilic: water contact angle drops to 0° within 1.3 s. • Pure water flux 1440 L·m⁻²·h⁻¹ and dye rejection over 93%. • Synergy enables > 93% flux recovery after 10 cycles without cleaning. • Excellent stability against ultrasonication, abrasion, and harsh chemicals. Conventional polymer separation membranes suffer from severe fouling, limiting their efficiency in wastewater treatment. To address this issue, we develop a multilayer-modified PVDF membrane by integrating a TiO₂/ZIF-8 photocatalytic layer and a CS-SDAEM zwitterionic polymer brush. The TiO₂/ZIF-8 nanoparticles are deposited on the membrane surface, followed by crosslinking and grafting of CS-SDAEM, which forms a robust hydration layer and physically encapsulates the nanoparticles. The resulting membrane exhibits superhydrophilicity (water contact angle drops to 0° within 1.3 s) and achieves a pure water flux of 1440 L·m⁻²·h⁻¹ with over 93% dye rejection for various dyes. Owing to the synergistic adsorption, photocatalysis, and antifouling effects, the membrane shows excellent self-cleaning ability, maintaining a flux recovery rate > 93% after 10 photocatalytic cycles without chemical cleaning. In addition, it exhibits excellent mechanical and chemical stability when subjected to ultrasonication, abrasion, and exposure to aggressive chemicals. This multilayer strategy offers a promising route to construct high-performance, long-lasting separation membranes for advanced water treatment. Download: Download high-res image (349KB) Download: Download full-size image

Mesoporous TiO2-GO-Cu Aerogel synthesized via classical sol-gel/supercritical drying route: High specific surface area and enhanced visible light photodegradation

Jinyi Ren,Sijia Liu,Jing Zhang,Xinfu Zhao,Shimo Yu,Zhipeng Yuan,Qingliang Guo,Xiaodong Shen,Xibin Yi

Developing highly efficient photocatalysts is crucial for solar-driven wastewater treatment, particularly in enhancing catalytic efficiency and visible-light response. In recent years, most researchers have utilized hydrothermal methods to integrate TiO₂ with graphene aerogels, thereby improving charge separation efficiency. However, severe buildup of graphene sheets will result in insufficient absorption of visible light. To address the limitation, this work directly used titanium dioxide aerogel as the framework, introduced graphene and nano-Cu particles, and combined the sol-gel method to construct a TiO 2 -GO-Cu ternary aerogel structure(TGCA), achieving the multi-component synergistic effect of the active components. The phase composition and mesoporous structure of the material were characterized by scanning electron microscopy, ultraviolet-visible spectrophotometry, N 2 adsorption test, etc. A large specific surface area of 692.9 m 2 /g and excellent pore structure were achieved. Moreover, under visible light irradiation, the degradation efficiency of Rhodamine B (RhB) reached 100% within 30 minutes, and the band gap was reduced to 2.75 eV. After eight cycles, the photocatalyst retained 76.18% of its degradation efficiency, outperforming most TiO₂-graphene materials. This study significantly improved the photocatalytic performance of the catalyst through structural regulation, optimization of electron transport, and enhancement of light absorption. It thereby offers a feasible approach and valuable reference for solar-driven wastewater treatment technologies.

Multifunctional linen cellulose fabric coating: Combined heat storage and thermoregulation, hydrophobicity, UV resistance and antibacterial properties

Mengmeng Zhang,Zhihui Sui,Lijian Sun,Qi Zhang,Yikun Xu,Lihua Deng,Fang Hu

Functional thermoregulation fabrics have emerged as a significant area of research and development within the textile industry, garnering extensive attention in recent years. Herein, dodecyl alcohol/paraffin wax-styrene-acrylate emulsions (DD/PW-TiO₂/FSiWSA) were prepared using the core-shell emulsion polymerization method and used for the finishing of linen fabrics. To address the issues of low solid content, insufficient stability, and poor water resistance in water-based styrene-acrylic emulsions (WSA), nano-TiO₂ was first modified with 3-methacryloxy propyl trimethoxysilane (KH-570). Subsequently, KH-570 modified nano-TiO₂ and organic fluorosilicon were simultaneously introduced into the polymer skeleton. The structural characteristics of DD/PW-TiO₂/FSiWSA were studied. The results shows that the DD/PW-TiO₂/FSiWSA coating increases the water contact angle (WCA) of linen fabric from 0° to 131.95°, while also providing excellent stain resistance. The modified fabric has excellent anti-UV properties, and the UV protection factor is as high as 56.16. Moreover, the modified fabric exhibited excellent antibacterial activity against A. niger and S. aureus . Encouragingly, the modified fabric has excellent heat storage and temperature regulation capability, with a peak phase transition temperature of 23.6 °C, a latent heat of fusion of 25.36 J/g, and a 65.9 % increase in thermal conductivity. The coating is universal and can enhance the hydrophobicity of materials such as cotton fabrics, polyester cotton, paper, cardboard and wood, with a WCA range of 115.56° ~ 131.72°. Therefore, this multifunctional coating will lead cellulose materials towards diverse applications.