Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 3
·799-805
·
IF 1.637
Zhao Piqi,Liu Honghua,Guo Xiangyang,Wang Han,Wang Shoude,Lu Lingchao,Cheng Xin
The bamboo charcoal/nano-TiO 2 (BC/TiO 2 ) composite material is designed and prepared for further improving photocatalytic property of TiO 2 . Assessment of BC/TiO 2 composite material and its application in photocatalytic coating are investigated by nitrogen absorption test, scanning electron microscopy-energy disperse spectroscopy (SEM-EDS) characterization and photocatalytic and mechanical properties analysis. The results show that optimal ratio of TiO 2 to BC is 0.03. Rhodamine B (RhB) degradation ratio can reach 62.9% under 4 h UV light irradiation, which is 43.7% higher than pure TiO 2 sample. The specific surface area (S BET ) and the total average pore size ( \(\overline {D}\) ) of BC/TiO 2 can reach 388.33 m 2 /g and 3.71 nm, respectively. Moreover, the photocatalytic coatings prepared mainly by BC/TiO 2 and polyacrylic emulsion (PAE), not only show satisfactory mechanical properties, but also have excellent photocatalytic property. When the addition of BC/TiO 2 composite materials is 6%, the photocatalytic property of coating is optimal, RhB degradation ratio can reach 83.7% under 8 h UV light irradiation. Also the adhesion, pencil hardness and impact resistance reach 2 level, 2H and 44 kg cm, respectively.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 12
·3875-3889
·
IF 5.721
Shaohua Pang,Yunfei Lu,Lin Cheng,Juming Liu,Huiyan Ma,Jucai Yang,Qiancheng Zhang
To date, various methods have been adopted to enhance the visible-light photocatalytic activity of nano-TiO2. However, a more facile and moderate method is still highly desirable. In this work, a series of defective nano-TiO2 photocatalysts with surface oxygen vacancy defects (SOVDs) coordinated by surface acetate ligands (SALs) were synthesized via a facile low-temperature sol-hydrothermal method without more complicated modifications. The low synthesis temperature not only results in the preservation of SALs derived from the protective agent acetic acid, but also results in a considerable amount of SOVDs due to low crystallinity and small particle size. The SALs are coordinated to nano-TiO2 in both bidentate chelating and bidentate bridging modes. The electron-withdrawing carboxyl groups can induce the splitting of the impurity states introduced by the SOVDs when the SALs and SOVDs coexist on the surface of TiO2. The split impurity states contribute mainly to the formation of valence band (VB) tail states, which can significantly narrow the bandgap of TiO2. Furthermore, the SOVDs and SALs synergistically result in the positive shift of the main VB edge of TiO2, which can significantly enhance the oxidizing capability of the photogenerated holes. Meanwhile, an appropriate amount of SOVDs can effectively promote the separation of photogenerated charge carriers. The synergistic effect of the above factors significantly enhances the photocatalytic activity of the oxygen-deficient nano-TiO2 for phenol degradation.
研究领域:
材料科学
·
环境科学
·
化学
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产品关联
DOI
高影响因子
HOLZFORSCHUNG
·
2015
·Vol. 70
·期 4
·361-367
·
IF 1.565
Xin Rao,Yongzhuang Liu,Yanchun Fu,Yixing Liu,Haipeng Yu
A transparent and protective multilayer coating composed of poly(allylamine hydrochloride) (PAH), poly(styrene sulfonic acid) sodium salt (PSS), and nano-TiO 2 films was fabricated on wood surfaces by layer-by-layer assembly method. The coating was formed through pre-immobilization of cationic PAH layer on wood substrate, followed by alternate soaking cycles in pH-controlled anionic PSS solution and TiO 2 colloidal solution. The structure and properties of the assembled coating were characterized through scanning electron microscopy (SEM), energy disperse X-ray analysis (EDXA), UV reflection and absorption, colorimetry, and contact angle (CA) measurement. Results revealed that the coverage uniformity and thickness were improved with increasing number of PSS/TiO 2 bilayers. The coating masked the cell wall ultrastructure while leaving the microscale features intact. The anatase TiO 2 in the assembled coating enhanced the UV stability of wood and resulted in a lowered photochromism. Furthermore, the photocatalytic capability of the nano-TiO 2 films in degrading dyes of rhodamine B and methylene blue was verified. The nano-TiO 2 film on the top surface of the coating embodied a superhydrophilicity, showing self-cleaning and anti-fog capabilities. Stearic acid modification altered the superhydrophilicity to hydrophobicity with CA of 140°.
研究领域:
材料科学
·
木材科学
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Fawei Wang,Bin Wang,Xuemei Li,Zhanmin Wu,Yufeng He,Pengfei Song,Rongmin Wang
Microorganism contamination on substrate surfaces is arousing increasingly concern as a serious health issue. In this study, we described fabricating antimicrobial cationic acrylate-based composite and investigating it as antimicrobial coatings of interior walls in buildings. Firstly, utilizing 3-(methacryloylamino) propyltrimethyl ammonium chloride (MPAC) and acrylates (BA, MMA) as monomers, a novel antimicrobial cationic acrylate-based copolymers (PAMs) was synthesized from surfactant-free emulsion polymerization (SfEP). The synthesis conditions, structures and physical properties of copolymers (PAMs) and its film (PAMs-F) were investigated through FT-IR, SEM, TEM and scratch test, etc. The results revealed that 6 % of MPAC and 0.5 % of KPS enabled the film-forming properties and enhanced conversion rate of PAMs, as well as endowed PAMs-F with significant antimicrobial activity. Furthermore, the PAMs based coating (PAMs-C) was prepared by PAMs and inorganic fillers. And the antimicrobial activity of PAMs-F and PAMs-C was measured, the effects of cationic monomer and nano-TiO 2 were also investigated. The results indicated that PAMs-C was able to use to protect the building interior wall from microbial contamination.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Xiangjie Chen,Ya Zhu,Kun Yang,Lizhong Zhu,Daohui Lin
Little information is available about effect of particle size and crystal structure of nTiO 2 on their trophic transfer. In this study, 5 nm anatase , 10 nm anatase, 100 nm anatase, 20 nm P25 (80% anatase and 20% rutile), and 25 nm rutile nTiO 2 were selected to investigate the effects of size and crystal structure on the toxicity, bioconcentration, and trophic transfer of nTiO 2 to algae and daphnia. In the exposed daphnids, metabolic pathways affected by nTiO 2 and nTiO 2 -exposed algae (nTiO 2 -algae) were also explored. The 96 h IC 50 values of algae and the 48 h LC 50 values of daphnia were 10.3, 18.9, 43.9, 33.6, 65.4 mg/L and 10.5, 13.2, 37.0, 28.4, 60.7 mg/L, respectively, after exposed to nTiO 2 -5A, nTiO 2 -10A, nTiO 2 -100A, nTiO 2 -P25, and nTiO 2 -25R, respectively. The bioconcentration factors (BCFs) for 0.1, 1, and 10 mg/L nTiO 2 in daphnia ranged from 21,220 L/kg to 145,350 L/kg. The nTiO 2 biomagnification factors (BMFs) of daphnia fed with 1 and 10 mg/L nTiO 2 -exposed algae were consistently greater than 1.0 (5.7–122). The results show that the acute toxicity, BCF, and BMF all decreased with increasing size or rutile content of nTiO 2 . All types of nTiO 2 were largely accumulated in the daphnia gut and were not completely depurated within 24 h. At the molecular level, 22 Kyoto Encyclopedia of Genes and Genomes (KEGG) metabolic pathways of daphnia were impacted by the nTiO 2 and nTiO 2 -algae treatments, including glutathione metabolism, aminoacyl-tRNA biosynthesis, among others. Six and four KEGG metabolic pathways were significantly disturbed in daphnids exposed to nTiO 2 and nTiO 2 -algae, respectively, indicating the presence of algae partially alleviated the negative impact of nTiO 2 on metabolism. These findings increase understanding of the impacts of physicochemical properties of nTiO 2 on the food chain from molecular scale to that of the whole organism, and provide new insight into the ecological effect of nanomaterials .
研究领域:
环境科学
·
毒理学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 3
·1-22
·
IF 2.533
Yang Chunyan,Xue Ziwei,Yin Hao,Lu Ke,Liu Wei
In this work, the photodegradation of methylene blue was investigated by constructing a novel photocatalysis reactor, which was filled with aqueous foam. Nanoscale TiO 2 particles were used as photocatalyst. In order to obtain stable foam phase, cetyl trimethyl ammonium bromide (CTAB) was used as the frother, and its suitable initial concentration in the feeding solution was 0.20 g/L. Under the suitable conditions of loading liquid volume 200 mL, initial concentration of TiO 2 nano-catalysts in the feeding solution 5.0 g/L, inner diameter of foam column 18 mm, aperture diameter of gas distributor 125 μm, and circulating velocity of bulk solution 500 mL/h, the maximum degradation percentage of methylene blue was 97.6 ± 1.2%. Atomic force microscopy (AFM) analysis suggested that the entrainment effect of rising bubbles and the circulation flow of bulk solution inside the aqueous foam did not cause the conspicuous aggregation of TiO 2 nano-catalysts under the suitable conditions, but their surface roughness decreased. Meanwhile, foam entrainment had not a significant impact on the polydispersity of TiO 2 nano-catalysts. In contrast to the photodegradation of methylene blue in aqueous solution, the photocatalysis process using aqueous foam is the intensity of light received by TiO 2 nano-catalyst increases, and irradiation period is less. This work is expected to provide new insight into the rational design of photocatalysis reactor, to facilitate the harmless treatment of dyestuff wastewater. Graphical abstract
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2024
·
IF 6.7
Cheng Chang,Zitao Li,Saeed Rad,Lei Gan,Junfeng Dai,Asfandyar Shahab
The high demand for water treatment and environmental restoration via advanced oxidation process (AOP) has estimated the increased production of TiO 2 -based materials. Low cost, high transmittance, durability, and thermal stability, make the recycling low-iron crushed glass an excellent candidate for nano TiO 2 film coating via sol-gel process. Besides support selection, the reactor design plays a vital role in the final product's applicability and efficiency. In this work, small pieces (3–6 mm) of recycled low iron crushed glass were deep coated with multiple layers of nano TiO 2 film for photocatalytic degradation of selected contaminants in a new design packed-bed reactor. A multi-chamber packed-bed photocatalytic reactor was set up for efficient BOD degradation under UV light exposure. SEM, XRD, and BET analysis characterized coating characteristics, morphology, phase, and surface area. For film adherence and coating durability, SEM characteristics and durability of TiO 2 photocatalytic activity tests were performed after the second reutilization. Results revealed that the new reactor can achieve 45.81 up to 79.50% BOD 5 reduction after 24 to 48 h of circulation with constant operation, respectively. low iron crushed glass appeared to be a perfect support for TiO 2 film coating with a BET of 0.0742 m 2 /g after 9 cycles of coating. XRD results showed 95–97% anatase phase crystals with an average particle size of 12.97 nm with different rounds of annealing at 550 °C in muffle. Results underpinned that the technique seems promising to be applied on a large scale for pretreated industrial or pharmaceutical wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Micro & Nano Letters
·
2014
·Vol. 9
·期 3
·193-197
·
IF 0.799
Fan Yang,Xiaojie Song,Lifeng Yan,Wenmei Wei
Three-dimensional cellulose gel was prepared by a crosslinking of the cellulose chains using epichlorohydrin in the presence of the NH 4 OH, and the TiO 2 nanoparticles which were fixed on the surface of cellulose gel to form microcrystalline cellulose gel/nanoTiO 2 composites (MCC-TiO 2 ). The composites were characterised by means of X-ray diffraction, thermogravimetric analysis and scanning electron microscopy, respectively. The composites showed an efficient removal of methyl orange (MO) from their aqueous solution, and a two-step mechanism is involved. At first, the MO molecules were enriched on the surface of the MCC-TiO 2 by absorption, and then they were degraded there via photocatalysis, and the degradation of the adsorbed MO promoted the further adsorption of MO from the solution. After 30 min, 94% of MO was removed, and the MCC-TiO 2 can be cleaned by itself and reused without additional treatments.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 50
·28329-28340
·
IF 2.936
Yongzhi Liu,Huaili Zheng,Yili Wang,Xinyu Zheng,Moxi Wang,Jie Ren,Chuanliang Zhao
In the face of complex water quality changes, the application of existing cationic polyacrylamide has been largely limited. In this study, a series of cationic polyacrylamides (TPADs) with excellent flocculation/dewatering performance and low dosage were synthesized through photocatalytic surface initiation using acrylamide (AM) and acryloyloxyethyl trimethylammonium chloride (DAC) as monomers and nano-TiO2 as an initiator. Characterization using Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (1H NMR) spectroscopy, thermogravimetric/differential scanning calorimetry (TG/DSC) and scanning electron microscopy (SEM) was used to analyze the structural and morphological properties of TPADs. The initiation mechanism was described and the study on the properties of TPADs shows that the initiation method could obtain the copolymer with extra-high intrinsic viscosity. Furthermore, the flocculation and dewatering performance of TPADs and PADs were investigated in the micro-polluted low turbidity water flocculation test and sludge dewatering test. The application experimental results indicated that TPADs showed satisfactory turbidity removal and sludge dewatering performance by virtue of strong charge neutralization and a bridging effect. The excellent flocculation/dewatering performance was attributed to the photocatalytic surface-initiated method and the nano-TiO2 initiator. Therefore, it is expected to open up new initiation methods in the synthesis of polymeric flocculants for a broad variety of applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 51
·29172-29178
·
IF 2.936
Jie Liu,Pinghe Yin,Ling Zhao
Macroalgae, the major contributor of primary productivity in coastal seas, contribute to the material cycle and energy flow in marine ecosystems. The purpose of this work was to evaluate the toxic effect of nano-TiO2 on the growth and antioxidant activity of Gracilaria lemaneiformis. An obvious inhibition of growth was observed in this study. The algae exposed to nano-TiO2 showed a negative growth rate at 20 mg L−1 and 40 mg L−1 during the 15 days exposure. The concentration of soluble protein increased slightly during the first 3 days of exposure, but it gradually diminished thereafter due to the high concentrations of nano-TiO2 and to prolonged exposure. Nano-TiO2 caused oxidative damage in G. lemaneiformis; superoxide anions accumulated, and nitrate reductase activity decreased linearly with the increase in nano-TiO2. Furthermore, extracts of G. lemaneiformis can scavenge DPPH· and hydroxyl radicals for their antioxidant capacity. However, the capacity to scavenge DPPH· and hydroxyl radicals in vitro decreased slightly with the increase in nano-TiO2. The results from this work imply that macroalgae can be an effective biomarker of nano-TiO2 contamination and can be useful indicators to evaluate the oxidative damage of increasing pollutants in marine ecosystems.
研究领域:
海洋生态学
·
环境毒理学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2014
·Vol. 20
·期 9
·1225-1234
·
IF 1.836
Ren Shitong,Zheng Tao,Zhou Qian,Zhang Liaoyun,Li Huayi
Hyperbranched star polymer HBPS-(PPEGMA)
x
was synthesized by atom transfer radical polymerization (ATRP) using hyperbranched polystyrene (HBPS) as macroinitiator and poly(ethylene glycol) methyl ether methacrylate (PEGMA) as monomer. The structure of the prepared hyperbranched star polymer was characterized by 1 H NMR, ATR-FTIR, and GPC. Polymer electrolytes based on HBPS-(PPEGMA)
x
, lithium salt, and/or nano-TiO 2 were prepared. The influences of lithium salt concentration and type, nano-TiO 2 content, and size on ionic conductivity of the obtained polymer electrolytes were investigated. The results showed that the low crystallinity of the prepared polymer electrolyte was caused by the interaction between lithium salt and polymer. The addition of TiO 2 into HBPS-(PPEGMA)
x
/LiTFSI improved the ionic conductivity at low temperature. The prepared composite polymer electrolyte showed the highest ionic conductivity of 9 × 10 −5 S cm −1 at 30 °C when the content of TiO 2 was 15 wt% and the size of TiO 2 was 20 nm.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2018
·
IF 3.239
Yaxuan Liu,Da Bian,Yongwu Zhao,Yongguang Wang
To promote anti-corrosion property of chemically bonded phosphate ceramic coatings (CBPCs), the nano-TiO 2 is selected as the reinforcement. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), Scanning electron microscope (SEM), Energy Dispersive Spectrometer (EDS) and the electrochemical analysis are carried out to clarify the role of nano-TiO 2 on the improvement of anti-corrosion performance. The experiments show that with the addition of nano-TiO 2 , the curing temperature and the activation energy of the curing process increase, which allows longest reaction and positively drives curing reactions at elevated conversions. The enhancement of anti-corrosion performance of CBPCs reinforced by nano-TiO 2 particles is based on three main mechanisms. Firstly, more bonded phase (AlPO 4 ) can be formed with the addition of nano-TiO 2 , which can help CBPCs to get more compact microstructure. Additionally, AlPO 4 particles possess the low density and good corrosion resistance , which leads to the increase in the corrosion resistance of CBPCs. Secondly, increasing content of nano-TiO 2 can also strengthen the compactness of CBPCs to protect the substrates from the penetration of aggressive electrolyte and prolong electrolyte diffusion path . Thirdly, through the analysis of microstructure of CBPCs, it is found that most of the hydrophobic nano-TiO 2 particles homogeneously distribute on the surface of CBPCs. Therefore, CBPCs show well hydrophobic performance, which can further improve the anti-corrosion property of themselves.
研究领域:
材料科学
·
腐蚀与防护
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）