POLYMER DEGRADATION AND STABILITY
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2020
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IF 4.032
Yan Zhang,Tianyi Sun,Dashuai Zhang,Zaifeng Shi,Xiaopeng Zhang,Chen Li,Lili Wang,Junjun Song,Qiang Lin
A novel photodegradable Nano-G/TiO 2 /PVC composite film was prepared by codoping nano-graphite (Nano-G) and TiO 2 photocatalyst in Polyvinyl chloride (PVC) plastic. The Characterization tests were performed by using ultraviolet-visible spectroscopy (UV-vis), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), gel permeation chromatography (GPC) and physical and mechanical properties. Compared with TiO 2 /PVC, Nano-G/PVC and PVC film, the Nano-G/TiO 2 /PVC composite film showed higher photodegradability. The weight loss rates of Nano-G/PVC (Nano-G 1 wt%), TiO 2 /PVC (TiO 2 1 wt%) and Nano-G/TiO 2 /PVC (Nano-G 1 wt%, TiO 2 1 wt%) films after the UV irradiation for 30 h were 7.68%, 8.94% and 17.24%, respectively, while that of PVC was only 2.12%. For the Nano-G/TiO 2 /PVC composite film, the optimal doping amount of nano-graphite is 1 wt%. The decline rates of Mw and Mn of Nano-G/TiO 2 /PVC (Nano-G 1 wt%, TiO 2 1 wt%) composite film were 12.93% and 61.97%, respectively, which were much higher than that of PVC. Nano-graphite can effectively improve the migration and separation of TiO 2 photogenerated electrons, improving the photodegradation rate of PVC. The mechanism of the Nano-G/TiO 2 /PVC composite film photocatalytic degradation was proposed. The photocatalytic technology is a feasible and effective way to solve "white pollution".
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 10
·13305-13322
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IF 2.478
Gu Yufen,Guo Bobo
Here, the novel Ag 2 MoO 4 /Bi 2 WO 6 (AMO/BWO) heterojunction composite photocatalysts were synthesized based on the combination (co-precipitation method + hydrothermal method) XRD, XPS, SEM, TEM, UV–Vis DR spectroscopy, PL spectroscopy, FTIR spectroscopy, as well as EIS analyses were employed to characterize the photocatalysts, and photocurrent response was utilized to confirme the formation of Z-type heterojunction. The generation and transfer of electron/holes in the AMO/BWO heterojunctions excited by simulated sunlight were analyzed. Under simulated sunlight, the photocatalytic performance of AMO/BWO composites were studied by degradation of organic pollutants. The experimental results show that the 30 wt% AMO@BWO is the best photocatalytic composite material among all samples and the degradation rate reached 98.6%. Due to the prolonging of lifetime of the photoexcited electrons in the CB of AMO and holes in the VB of BWO, these carriers are more effective to participate in photodegradation reactions. An electron/hole transfer mechanism of the Z-scheme heterojunctions is proposed to illustrate the enhanced photodegradation performance of the AMO/BWO composite samples.
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
高影响因子
NANOTECHNOLOGY
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2021
·Vol. 32
·期 40
·405204
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IF 3.874
Fei Huang,Sen Luo,Zhen Li,Aihua Yan,Haiming Dong,Yifeng Xu,Xianhui Zhao
Recently, Nb3O7F (NOF) semiconductor has been intensively studied owing to its excellent ultraviolet activity, good thermal stability and low carrier recombination. In this work, we report a five-step technique to synthesize hollow carbon spheres (HCSs)/NOF hybrids. Activating the surface of HCSs by creating oxyfluorinated functionalization can easily trigger an interaction between oxyfluorinated HCSs and NOF intermediates, finally resulting in the formation of HCSs/NOF hybrids. By manipulating the contents of HCSs with unexceptionable electron mobility, the hybrids can simultaneously achieve narrower band gap, stronger light absorption and rapider charge transfer. As a consequence, HCSs/NOF hybrids exhibit enhanced photodegradation performance towards RhB solutions under simulated sunlight irradiation. Specially, HCSs/NOF-1.0 catalysts with 95.7% degradation efficiency within 40 min demonstrate approximately four times higher photocatalytic activity than that of pure NOF catalysts. The results may offer new inspirations for a design of novel catalysts with higher photoactivity.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Polymer-Plastics Technology and Materials
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2021
·
IF 2.371
Yan Zhang,Zaifeng Shi,Tianyi Sun,Dashuai Zhang,Xiaopeng Zhang,Xiaoxue Lin,Chen Li,Lili Wang,Junjun Song,Qiang Lin
A novel photodegradable Methylene Blue (MB)/TiO2/PVC film was prepared. The physical and mechanical properties, hydrophilicity, and the thermal stability of the film before irradiation were characterized. The photodegradability test was performed by using gel permeation chromatography (GPC), infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), and scanning electron microscopy (SEM). Compared with TiO2/PVC, MB/PVC, and PVC, the MB/TiO2/PVC film showed the higher photodegradability. The weight loss rates of TiO2/PVC, MB/PVC, and MB/TiO2/PVC films after irradiation for 30 h were 8.94%, 15.84%, and 27.55%, respectively, while that of PVC was only 2.12%. The decline rates of Mw and Mn of MB/TiO2/PVC (MB 2 wt%, TiO2 1 wt%) were 35.68% and 65.38%, respectively. Due to the excellent degradability and usability of the MB/TiO2/PVC film, the photocatalytic technology is a feasible and effective way to solve “white pollution”.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MATERIALS LETTERS
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2013
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IF 2.224
Jianxiu Liu,Dafeng Zhang,Xipeng Pu,Jiaxing Liu,Renqian Zhang
Zn 1− x Cd x S ( x =0–1.0) powders were synthesized by a simple combustion method using cadmium nitrate, zinc nitrate and thiourea as raw materials. The structures, morphologies, absorbance, luminescence and photocatalytic properties of the samples were studied by X-ray powder diffraction, transmission electron microscopy , ultraviolet–visible spectrophotometry and photoluminescence . The results show that all Zn 1− x Cd x S samples exhibit hexagonal structure and no metastable cubic phase is obtained. With increasing content of Cd, red-shifts are observed in both the absorption edges of UV–vis absorption spectra and emission bands of photoluminescence spectra. Among all Zn 1− x Cd x S samples, CdS shows the best visible-light photocatalytic performance due to its narrow bandgap.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
·
IF 6.1
Feihu Zhang,Xinyan Xiao,Yu Xiao,Xia Cheng
An innovative 3D flower-like BiOI/Bi 3 O 4 Br hierarchical heterostructures complex material was firstly constructed via in-situ growth of ultrathin BiOI on Bi 3 O 4 Br by a simple precipitation method. Under the simulated solar-light illumination for 90 min, the optimal 60% BiOI/Bi 3 O 4 Br composite displayed the highest photodegradation rate of 96.4% for RhB, 80.0% for TC and 77.2% for MO. The corresponding apparent rate constants were 0.0314, 0.0167 and 0.0110 min −1 , which were 8.26, 1.82 and 3.24-times than that of Bi 3 O 4 Br, 44.86, 11.13 and 2.62-times than that of BiOI. The improved photodegradation activity could be owing to the following reasons: 1) The 3D hierarchical heterostructures endowed BiOI/Bi 3 O 4 Br with tight interfacial contact, which can supply sufficient migration channels for photoinduced carriers; 2) The Z-scheme charge migrate pathway promoted the segregation of photocarriers while maintaining a robust redox ability; 3) The BiOI/Bi 3 O 4 Br heterostructures reinforced light absorption edges more than 600 nm and augmented specific surface areas over 60 m 2 ·g −1 . In addition, the various photocatalytic conditions were studied to imitate the degradation process of RhB in the real aqueous system. The radical capture experiments and EPR test attested that h + and O 2 − played an important part in the photodegradation of RhB.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Nanoscale
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2018
·Vol. 10
·期 28
·13661-13672
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IF 7.233
Wei Jiang,Hongyan Fu,Yingming Zhu,Hairong Yue,Shaojun Yuan,Bin Liang
In this research, a controlling mechanism of particle size on the wettability of Ag2O particles is reported, and an interesting floatable Ag2O photocatalyst with superhydrophobicity and superoleophilicity is prepared based on this mechanism. Stable superhydrophobic and superhydrophilic Ag2O without a low-surface-energy modifier can be obtained only by adjusting its particle size, and its wettability can switch mutually by changing the particle size. The wettability of Ag2O converts from superhydrophilic to hydrophobic when the average particle size is more than 1.08 μm. The operation parameters of the Ag2O crystallization process significantly influence the wettability of the Ag2O particles. The obtained superhydrophobic Ag2O floated on the water surface, and exhibited excellent photodegradation performance with various floating oils. This attractive superhydrophobic Ag2O photocatalyst is promising for practical applications, and provides a strategy for the development of functional photocatalysts and superhydrophobic materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 14
·8643-8657
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IF 4.22
Ma Ligang,Ai Xiaoqian,Yang Xingming,Cao Xiaoxiao,Han Dianrong,Song Xiang,Jiang Huilin,Yang Wei,Yan Senlin,Wu Xiaoshan
CdS with band gaps of 2.4 eV is an essential semiconductor for optoelectronic and photocatalytic devices. In this study, Cd(II)-based metal–organic framework (MOF)-derived CdS photocatalysts are successfully synthesized using a facile chemical bath deposition method. CdS precursors are derived from Cd-based MOFs that H 2 S gas was bubbled into as S source. Four kinds of CdS nano-photocatalyst are obtained through controlling the thermal annealing process of CdS precursors. The excellent photocatalytic performance of CdS and the benefits of the porous and molecular sieving properties of MOFs are well integrated. The evolution of the morphology, microstructure, and optical properties are investigated by various characterization methods. The results indicate that the sample with an annealing temperature of 500 °C is primarily nanosheet structures with sizes ranging from 20 to 30 nm, which construct a porous network structure, Moreover, the best photodegradation activity is obtained by illuminating the catalyst in rhodamine-B dye solution for 80 min and reducing the absorption intensity to nearly zero. Finally, the pollutant degradation mechanism was analyzed in detail.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Catalysts
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2019
·Vol. 9
·期 10
·795
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IF 3.444
Yuxiang Yan,Hua Yang,Zao Yi,Tao Xian
In this work, we have synthesized BiOCl nanoplates (diameter 140–220 nm, thickness 60–70 nm) via a co-precipitation method, and then created Bi nanoparticles (diameter 35–50 nm) on the surface of BiOCl nanoplates via a NaBH4reduction method. By varying the NaBH4concentration and reaction time, the evolution of Bi nanoparticles was systematically investigated. It is demonstrated that with increasing the NaBH4concentration (at a fixing reaction time of 30 min), BiOCl crystals are gradually reduced into Bi nanoparticles, and pure Bi nanoparticles are formed at 120 mM NaBH4solution treatment. At low-concentration NaBH4solutions (e.g., 10 and 30 mM), with increasing the reaction time, BiOCl crystals are partially reduced into Bi nanoparticles, and then the Bi nanoparticles return to form BiOCl crystals. At high-concentration NaBH4solutions (e.g., 120 mM), BiOCl crystals are reduced to Bi nanoparticles completely with a short reaction time, and further prolong the treatment time leads to the transformation of the Bi nanoparticles into a two-phase mixture of BiOCl and Bi2O3nanowires. The photodegradation performances of the samples were investigated by choosing rhodamine B (RhB) as the model pollutant and using simulated sunlight as the light source. It is demonstrated that an enhanced photodegradation performance can be achieved for the created Bi@BiOCl hybrid composites with appropriate NaBH4treatment. The underlying photocatalytic mechanism was systematically investigated and discussed.Keywords:BiOCl nanoplates;Bi nanoparticles;NaBH4reduction;Bi@BiOCl hybrids;photodegradation performance
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2020
·Vol. 37
·期 1
·64-77
·
IF 1.681
Yuxiang Yan,Hua Yang,Zao Yi,Xiangxian Wang,Ruishan Li,Tao Xian
In this work, we have adopted a coprecipitation method to synthesize BiOBr nanoplates with diameter of 150–450 nm and thickness of 40–80 nm, and then created Bi nanowires (diameter: 6 nm) on their surface through a NaBH4 reduction method. Evolution of Bi nanowires was systematically investigated by varying the concentration of NaBH4 solution and reaction time. It is demonstrated that with increasing the NaBH4 concentration (2 h reaction), Bi nanowires are gradually evolved from BiOBr crystals, and in particular treatment by 110 mM NaBH4 solution leads to the complete evolution of BiOBr nanoplates to Bi nanowires. At a low-concentration NaBH4 solution (30 mM), BiOBr crystals are partially reduced to Bi nanowires with increasing reaction time, and then the Bi nanowires are recrystallized into BiOBr nanowires/nanoparticles on the surface of BiOBr nanoplates. At a high-concentration NaBH4 solution (110 mM), BiOBr nanoplates are easily reduced to Bi nanowires with a short reaction time, and further prolonging the reaction time leads to the gradual transformation of Bi nanowires into Bi4O5Br2 nanoparticles/nanowires. Photocatalytic performances of the samples were evaluated by eliminating rhodamine B from aqueous solution under simulated sunlight illumination. It is demonstrated that the creation of Bi nanowires (an appropriate content) on the surface of BiOBr nanoplates can produce excellent Bi@BiOBr composite photocatalysts with enhanced photodegradation performances. The underlying enhanced photocatalytic mechanism was investigated and discussed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Bo Ge,Lu Han,Xin Liang,Fengyan Li,Xipeng Pu,Xiaotao Zhu,Zhaozhu Zhang,Xin Shao,Chuanyu Jin,Wenzhi Li
Materials with superhydrophobicity have been successful in removing and recovering oily pollutants in water, however, it cannot get rid of water soluble pollutants. In this paper, we prepared a superhydrophobic Cu-BiOBr surface which combined the superhydrophobicity with the photodegradation property to realize the oil/water separation and the removal of water-soluble pollutants. The result shows that the surface of the material has macroporous (620 nm) and mesoporous (3.2 nm) structure. The degradation efficiency for Rhodamine B (Rh B) does not change after 5 times of repeated use, which indicates the good degradation stability of the material. In addition, the surface remains superhydrophobic and high flux for up to 11 cycles. The preparation process is simple and economical with no complicated and expensive equipment but only filtration and spraying used. A 13 cm × 13 cm superhydrophobic Cu-BiOBr mesh was also prepared to verify the feasibility of large scale fabrication.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Bo Yu,Fanming Meng,Muhammad Wasim Khan,Rui Qin,Xingbin Liu
Herein, TiO 2 /g-C 3 N 4 /Ag (TCA) composites were successfully fabricated by a simple two-step method and wet chemical reduction. Titanium isopropoxide and melamine were used as precursors to prepare TiO 2 /g-C 3 N 4 heterojunction composites by simple stirring and calcining. Then, different mass fractions of AgNPs were decorated on the surface of the above composites by wet chemical reduction to obtain a sequence of TiO 2 /g-C 3 N 4 /Ag (TCA) composites. TCA composites were analyzed by XRD, TEM, HRTEM, EDS, XPS, BET, Raman spectroscopy, PL spectrum and UV–vis diffuse reflectance spectrum. The results showed that TCA composites had remarkable enhancement in the separation of photogenerated carriers and the utilization of light, which was as result of the coordination of the three components. For photodegradation of RhB or phenol under simulated sunlight, TCA-1 samples revealed the best photocatalytic degradation performance, and the corresponding degradation rates were 91.4% at 60 min and 90.0% at 120 min, respectively. Moreover, TCA-1 composites maintained superior degradation performance after reusability tests, indicating that TCA-1 composites had excellent photochemical stability. For experimental results, a possible photodegradation mechanism of TCA composites was also proposed.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）