Coatings
·
2023
·Vol. 13
·期 2
·317
·
IF 3.4
Yan Zhang,Tianyi Sun,Dashuai Zhang,Chen Li,Jinrui Liu,Bangsen Li,Zaifeng Shi
The fact that the use of a large number of plastic products has brought serious pollution to the environment has always been the focus of global attention. The development of photocatalytic degradable plastics is one of the effective ways to solve the problem of “white pollution”. In this work, La3+modified TiO2nanoparticles were prepared by ball milling and characterized. La3+/TiO2was mixed with Polyvinyl chloride (PVC) plastic to make a photodegradable composite film, and the photodegradation performance and mechanical properties of films were evaluated. The photodegradable films were characterized by infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), and scanning electron microscopy (SEM). After 30 h UV irradiation, the weight loss rate of the PVC was only 2.12%, while that of the TiO2/PVC reached 8.94%. The accelerating of the degradation rate was due to the mixing of TiO2into PVC. As for the La3+/TiO2/PVC composite film, when the mass percentage of La3+/TiO2was 1.5%, the weight loss rate of La3+/TiO2/PVC sample reached a maximum of 17.78%, which was eight times the degradation rate of PVC and two times the degradation rate of TiO2/PVC. The La3+/TiO2/PVC film showed good photodegradability. La is a transition metal element with a special 4f electronic structure. The reaction mechanism of photodegradation of PVC by the interaction of La3+and TiO2were discussed.Keywords:La3+modified TiO2;La3+/TiO2/PVC composite film;ball milling method;photodegradation
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Liangdong Hu,Ruifan Li,Ying Liu,Dona Souliyathai,Wenjie Zhang,Yubao Chen
Fuel components were prepared in this study using rubber seed oil via photothermal catalysis under energy-saving conditions. Modified TiO 2 was employed as the catalyst in the catalytic reactions. X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray fluorescence (XRF), hydrogen temperature-programmed desorbtion (H 2 -TPD), CO pulse chemisorption analysis, and UV–vis spectroscopy were employed to examine the microstructure and chemical properties of the modified catalysts. The loading of the catalysts with different active metals considerably reduced the bandgap, leading to enhancements in the absorption of visible light. Temperature, H 2 pressure, and reaction time were optimised for the photothermal catalytic reaction via the single factor test. The Pt/TiO 2 catalyst realised the highest conversion and selectivity among the tested samples at 120 °C and a H 2 pressure of 0.4 MPa for 12 h. Additionally, photo-decarboxylation was confirmed via probing with oleic acid to be the predominant process in the catalytic reaction. This research provides an energy-saving strategy for the preparation of biofuels.
研究领域:
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2023
·
IF 3.4
Shaohua Huo,Zhen Dong,Xiangcheng Li,Pengcheng Liu,Pingan Chen,Boquan Zhu
In this paper, a novel phosphate-based adhesive with excellent high-temperature bonding strength was prepared by using phosphate as the matrix and modified B 4 C, modified TiO 2 as well as low-temperature fused Zn–B–Si–Al-R glass materials as fillers. The effects of heat treatment temperature and filler compositions on the high-temperature bonding strength of the adhesive were investigated. The results indicated that the aluminum phosphate in the adhesive was transformed from orthorhombic to cubic crystalline at 210 ± 5 °C, which increased the cell stacking density from 2.19 g/cm 3 to 2.74 g/cm 3 and made the binder dense. After calcination at 500 °C, a large number of pyrophosphates were generated inside the adhesive, and the chemical bonds such as P–O–Si and P–O–Cu in these pyrophosphates formed reticulated skeletal macromolecules, which improved the network structure of the transition zone between the adhesive and stainless steel . Meanwhile, the difference in potential resulted in the exchange of Fe and Cu 2+ , H + at the bonding interface to enhance the high-temperature resistance and bonding strength of the specimen. When the additions of La 2 O 3 , Fe 2 O 3 , ZrO 2 , CuO were1.2%, 5%, 10%, and 15%, the maximum tensile strength of the specimen reached 8.73 MPa at 500 °C. The phosphate binder prepared in this work could be widely used in the field of high-temperature material repair such as aerospace and energy.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Yu Qi,Peng Wu,Tengfei Huo,Zhuoyi Li,Xueli Li,Yantu Zhang
Anti-corrosion coatings ensure material safety and extend service life, serving as important safeguards in the fields of construction, infrastructure, petrochemicals, and marine engineering. Therefore, this study introduces a dual-nanofiller synergistic system by blending epoxy resin, 3-hydroxy-2-naphthylhydrazine modified reduced graphene oxide, and TiO 2 nanofillers modified with the silane coupling agent KH570 to create a novel nanocomposite coating. Compared to traditional coatings, the synergistic effect of the dual nanofillers formed a dense nanonetwork structure, enhancing the corrosion resistance and mechanical properties of the coating. The results show that the composite coating has a smooth surface with minimal crack formation. In addition, the toughness and wear resistance of the composite coatings were improved. Electrochemical Impedance Spectroscopy analysis revealed that the impedance value of the Dual nanofiller composite coating was two orders of magnitude higher than that of the other coatings, showing the strongest corrosion resistance. A 45-d long-term immersion experiment was conducted on the composite coatings. The results showed that after 45 d of immersion in 3.5 wt% NaCl solution at room temperature, the Z modulus of the dual nanofiller composite coating decreased from 10 9 Ω·cm 2 to 10 7 Ω·cm 2 . Although the performance declined, the coating still exhibited relatively high corrosion resistance and no significant physical defects, maintaining a good overall structure. This study provides an ideal method for enhancing the corrosion resistance of coatings by using a dual-nanofiller synergistic system.
研究领域:
材料科学
·
腐蚀防护工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2021
·Vol. 42
·期 5
·2511-2522
·
IF 3.171
Jingding Zhang,Ling Zhang,Chunzhong Li
The application of polymers in packaging is still limited due to the problems of poor gas barrier and flame retardant properties. Herein, a modified TiO 2 (m-TiO 2 )@graphene oxide (GO)/montmorillonite (MMT) filler-reinforced polyvinyl alcohol (PVA)-based nanocomposite films with excellent gas barrier, flame retardant, and mechanical properties is fabricated through a simple method of solution casting. In this system, GO and MMT act as bricks, PVA sticks them together like glue, and they together form a brick-wall structure. By adding these fillers, the oxygen permeability rate ( Po 2 ) of this film is 0.48 × 10 −18 cm 3 •cm/(cm 2 •s•Pa), less than that of pure PVA film by 97%, and the water vapor permeability rate ( ) of the nanocomposite film is 1.21 × 10 −13 g•cm/(cm 2 •s•Pa), less than that of pure PVA film by 86%. In addition, the flame retardant properties of m-TiO 2 @GO/MMT/PVA nanocomposite films are excellent, which self-extinguishes as long as the flame taken away, different from pure PVA film, which is completely burned. Moreover, the thermal stability and mechanical properties of the nanocomposite films are also significantly improved. The nanocomposites with environment-friendly raw materials, simple manufacturing processes, and excellent performance should have good applications in the packaging and coating industries.
研究领域:
材料科学
·
包装工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 5
·456
·
IF 2.654
Lihui Xuan,Guangping Han,Dong Wang,Wanli Cheng,Xun Gao,Feng Chen,Qingde Li
Surface modification and characterization of titanium dioxide (TiO2) nanoparticles and their roles in thermal, mechanical, and accelerated aging behavior of foamed wheat straw fiber/polypropylene (PP) composites are investigated. To improve the dispersion of nanoparticles and increase the possible interactions between wheat straw fiber and the PP matrix, the surface of the TiO2nanoparticles was modified with ethenyltrimethoxy silane (A171), a silane coupling agent. The grafting of A171 on the TiO2nanoparticles’ surface was characterized by Fourier transform infrared spectroscopy (FTIR). The wheat straw fibers treated with A171 and modified TiO2nanoparticles were characterized by FTIR and thermogravimetric analysis (TGA). FTIR spectra confirmed that the organic functional groups of A171 were successfully grafted onto the TiO2nanoparticles and wheat straw fibers, and the modified TiO2nanoparticles were adsorbed onto the wheat straw fibers. Thermogravimetric analysis showed that a higher thermal stability of the wheat straw fiber was obtained with the modified TiO2nanoparticles. The flexural, tensile, and impact properties were improved. A higher ultraviolet (UV) stability of the samples treated with modified TiO2nanoparticles was exhibited by the study of the color change and loss in mechanical properties.Keywords:surface-modified TiO2nanoparticles;foamed wheat straw fiber/polypropylene composites;mechanical properties;thermostability;UV stability
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
Food and Bioprocess Technology
·
2025
·
IF 5.8
Liu Danfei,Li Xiaoxuan,Zhang Chuanxiang,Chen Yuyang,Zhou Wenxuan,Zhang Changfan
In this study, amine-responsive bilayer films (agar/black wolfberry anthocyanin (AG/BWA) and agar/black wolfberry anthocyanin/sodium alginate/hydrophobically modified TiO 2 nanoparticles (AG/BWA/HM)) were fabricated. These films consist of a sensing layer made of agar/anthocyanin and a protective layer composed of sodium alginate and hydrophobically modified TiO 2 nanoparticles (HMTI). The fabrication process involved the solvent evaporation method and screen-printing technique, with anthocyanins extracted from black wolfberry serving as the key component in the sensing layer. The prepared films were characterized by FTIR, SEM, XRD, and UV spectroscopic techniques. Water contact angle measurements showed that the AG/BWA/HM film was hydrophobic (> 90°). The incorporation of anthocyanins increased the tensile strength of the films by 6–10 MPa, the elongation at break by 3–6%, and the water solubility by 4–15% compared to control films (agar film). Light stability and storage stability tests revealed that the incorporation of hydrophobically modified TiO 2 effectively enhanced the stability of the films. When exposed to different pH values, the bilayer films showed different color changes, with a significant change from acidic to basic. The ammonia vapor test showed that the sensitivity of the AG/BWA/HM film was improved by 20.1% compared to the AG/BWA film. The indicator film was used to monitor the deterioration of pork at room temperature (25 ℃), and the color of the AG/BWA/HM film changed significantly with the increase of total volatile basic nitrogen (TVBN) of pork stored at room temperature (25 ℃) for 24 h as the freshness of pork changed gradually, indicating the promising application of this double-layer indicator film in the monitoring of meat freshness. Graphical
研究领域:
食品科学
·
材料科学
·
分析化学
·
纳米技术
·
食品安全
·
高分子科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）