PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Kangren Niu,Kuiyan Song
To prevent the degradation of wood surfaces by ultraviolet radiation and liquid water, modified polyethylene wax and modified polyethylene wax/oxidized paraffin composite wax were used for the protection of wood surfaces with hot wax treatment. The effects of natural beeswax coating and modified synthetic wax coating on wood surface aging behavior were also studied. Results showed that changes in color, gloss, water uptake, contact angle, micro-morphology, and chemical changes of wood treated with modified synthetic wax hot waxing were less than those of wood treated with natural beeswax hot waxing after long-term aging under ultraviolet (UV) light and water. Among them, the modified polyethylene wax/oxidized paraffin composite wax coating showed the best protective effects on the wood surface, and the composite wax coating reduced the UV penetration and enhanced the UV oxidative degradation resistance. In addition, the synergistic effect of modified polyethylene wax and oxidized paraffin further reduced the water uptake of wood during aging process. This data clearly shows that the modified synthetic wax and composite wax coating can effectively inhibit the photooxidative degradation of wood surface, provide a lasting hydrophobic protection effect on wood, and show long-term photostability.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yuchun Li,Jinzhao Wang,Boqiong Xue,Shuheng Wang,Peng Qi,Jun Sun,Hongfei Li,Xiaoyu Gu,Sheng Zhang
An integrated multi-functional additive was fabricated by successively grafting melamine (MEL) and phytic acid (PhA) on multiwalled carbon-nanotubes (MWNCTs), and was then applied in PA6 to improve the flame retardancy and light aging resistance of the composite. The limit oxygen index of PA6 composite containing 7 wt% PhA-MEL-MWCNTs was increased to 26.4 from 21.0. The smoke and CO release were significantly reduced by 48% and 88% respectively, and the severe melt dripping of PA6 in burning was eliminated. It is proved that PhA-MEL-MWCNTs can absorb ultraviolet (UV) radiation, and hence significantly reduces the mechanical property loss of the PA6 composite after UV aging. The tensile strength of the aged PA6/7 wt%PhA-MEL-MWCNTs composite sample only decreased by 18.1%, which was significantly lower than the loss rate of the control aged PA6 sample (62.5%). This protocol provides a new opportunity for fabricating long-life flame retardant polyamide composites.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Longqian Wang,Jingya ye,Jingyi Zhang,Qinglong Meng,Xiaoyu Li,Zhonglin Chen,Huahu Yu,Ao Zhang,Zhuoyu Bu,Yongli Jiao,Yuwei Pan
Peracetic acid (PAA) was successfully activated by UV and Fe 0 to degrade sulfamethazine (SMT) in this study. UV/Fe 0 /PAA system not only could enhance SMT removal efficiency but also could reduce the energy consumption in comparison with UV, Fe 0 /PAA and UV/PAA systems. The R O • radical was the main radical for the degradation of SMT in UV/Fe 0 /PAA system and photolysis, • OH and R-O • exhibited 15.6%, 17.6% and 66.8% contribution for SMT degradation, respectively. Fourier transform infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM), and X-ray photoelectron spectroscopy (XPS) were conducted to investigate the characterization of Fe 0 after reaction in UV/Fe 0 /PAA system. The possible SMT degradation pathway was also proposed. Affecting factors such as Fe 0 dosage (0–0.2 g L −1 ), PAA concentration (0–200 μM) and initial pH (3–9) were also studied. Cl − , NO 3 - , SO 4 2- and HCO 3 - had a negligible adverse effect on SMT removal in this system indicating the good adaptability to inorganic ions. In addition, UV/Fe 0 /PAA system had the good recycle ability of Fe 0 and showed a good performance in removing antibiotic in the nature fresh water. Therefore, this study notably improved the knowledge of PAA activated by Fe 0 and UV and showed the potential applicability of UV/Fe 0 /PAA system in degrading antibiotics in nature fresh water.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Mengtian Yu,Dongpo He,Yuhang Zhang,Dahao He,Xing Wang,Jinghui Zhou
Acanthopanax senticosus has been used to extract active products. However, abundant Acanthopanax senticosus residues (ASR), which contain plenty of lignin are discarded after extraction. An appropriate extraction method should be chosen to obtain the lignin with such desirable properties. Thus, this study investigated the effect of alkali, milled wood, deep eutectic solvent and ethanol methods on the lignin. Lignin obtained from different extraction methods were characterized, yields, chemical structure, thermal behavior, molecular weight and phenolic content were evaluated. The results show that the process of lignin acquisition has a great influence on the properties of lignin. Moreover, the multifarious functional groups exist in lignin macromolecules , such as phenolic, ether groups and other chromophores, conferred good UV resistance to lignin. Among them, the lignin from alkali method has the most phenolic-OH groups and smallest molecular weight result in a good UV-resistant, the SPF value achieves 2.39 at 1% AL content, the alkali method was the best way to make sunscreen blended with cream take various factors into consideration. This study used lignin as a bioactive ingredient to provide UV-resistant property to sunscreen formulations. Furthermore, lignin extracted from Acanthopanax senticosus residue provides a new application for the treatment of herb residue waste.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Qingming Huang
The preparation of high performance upconversion luminescence materials with stronger shortwave emissions is still a challenge. In this work, the feature of hexagon circles sublattice structure of tetragonal LiYF 4 was revealed, and the sublattice level energy clusters of 4 Yb 3+ -1Tm 3+ were constructed by the substitution of 70 mol% Yb 3+ for Y 3+ in tetragonal LiYF 4 matrix. The sensitizing ions concentration quenching was inhibited by the hexagon circles sublattice structure, and the upconversion luminescence was dramatically enhanced, especially, the UV band emission was enhanced about 20 times and the intensity ratio of UV to blue emissions was improved about 10 folds under the excitation power density of 0.230 W/cm 2 . Photon numbers of upconversion emissions obviously decreased with the increasing of sublattice level energy clusters that the upconversion process of three photons was changed to two steps of two photons process. The upconversion luminescence mechanism of sublattice energy cluster construction was system investigated. The material with high performance of UV and blue UC luminescence can be a well candidate for the applications of photodynamic therapy and photocatalytic, etc. The work may be an inspiration for high efficient UC luminescence materials design and preparation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xing Zhang,Jilun Yao,Zhiwei Zhao,Jie Liu
Haloacetonitriles (HANs), a specie of new emerging halogenated nitrogenous disinfection by-products (N-DBPs) including trichloroacetonitrile (TCAN), dichloroacetonitrile (DCAN), monochloroacetonitrile (MCAN) and dibromoacetonitrile (DBAN), were more cytotoxic and genotoxic than the conventional DBPs. In this study, kinetics and mechanisms in the oxidization of HANs by UV/peroxymonosulfate (PMS) process were investigated. The degradation of chloroacetonitriles (CANs) in UV/PMS process was more remarkable than UV alone, PMS alone and UV/H 2 O 2 process. And the order of the rates of degradation of HANs was followed: TCAN > DCAN > MCAN, while DBAN was remarkably degraded by UV alone. The degradation of DCAN was accelerated by humic acid and Cl − , while suppressed by bicarbonate. Scavenging experiments showed that hydroxyl radical ( rad OH) was the predominant species in the reaction. According to the gas chromatography/mass spectrometer (GC/MS) analysis, the breakage of C Cl bond was the dominant pathways in degradation of CANs.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
·
IF 2.752
Yu Li,Liang Zhao,Hao Wang,Baohua Li
The novel microencapsulated n -octadecane with TiO 2 -doped silk fibroin (SF) shell was synthesized using a self-assembly method in o/w emulsion. It was confirmed by Fourier transformation infrared spectroscope (FT-IR) and a three-phase contact angle that TiO 2 is successfully modified by SF aqueous solution. The scanning electronic microscope (SEM) and laser scattering particle size distribution analyzer showed that the as-prepared microcapsules have regularly spherical morphology and are about 4–5 μm in average diameter. According to differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA) and ultraviolet visible spectrophotometer (UV–vis) measurements, the TiO 2 -doped microcapsule presents high thermal storage capability, enhanced thermal reliability and stability, and have good UV-shielding property. The TiO 2 -doped microcapsule synthesized in the present study could prove to be path-breaking and lead to further studies in the field of thermal energy storage and UV-shielding applications.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Zhiwei Huang,Robert S. Gurney,Yalun Wang,Wenjiao Han,Tao Wang,Dan Liu
Durability under UV illumination remains a big challenge of TiO2-based superhydrophobic coatings, with the photocatalytic effect causing degradation of low-surface-energy material over time, resulting in the surfaces losing their hydrophobicity. We report surfaces made from tolylene-2,4-diisocyanate (TDI)/TiO2 hybrid networks that demonstrate superhydrophobicity and superior UV durability. Structural and morphological studies reveal that the TDI/TiO2 hybrid networks are composed of TiO2 nanoparticles interconnected with TDI bridges and then encapsulated by a TDI layer. Through controlling the fraction of TDI in the synthesis process, the thickness of the TDI encapsulation layer around the TDI/TiO2 hybrid networks can be varied. When the weight ratio of TDI/TiO2 is 5:1, the superhydrophobicity of the hybrid network surface remains almost unchanged after a month of continuous UV illumination. This hybrid network surface can also clean methylene blue solution through the synergistic effects of cation adsorption and photocatalysis, holding promising potential for applications toward reducing cation pollutions in both liquid and air environments.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Kan Tan,Ren Liu,Jing Luo,Ye Zhu,Wei Wei,Xiaoya Liu
In this study, an efficient method of preparing tannic acid functionalized UV-curable carbon nanotube for the reinforcement of acrylated epoxidized soybean oil coating is presented. A photoactive tannic acid (pTA) was prepared by the ring opening reaction of tannic acid (TA) and glycidyl methacrylate (GMA), and then used to non-covalently functionalize carbon nanotubes via π-π interactions to obtain a novel kind of tannic acid functionalized UV-curable carbon nanotube (pTA/MWCNTs). The pTA/MWCNTs was fully characterized and subsequently incorporated into acrylated epoxidized soybean oil (AESO) covalently via UV curing technology. A series of epoxidized soybean oil acrylate composite with different content of pTA/MWCNTs were prepared and the properties of pTA/MWCNTs/AESO composite materials were investigated. Real-time IR and ATR-FTIR were used to monitor the double bond conversion and deep curing of pTA/MWCNTs/AESO coating. The mechanical properties of UV-cured films were evaluated by tensile testing. The results showed that the introduction of pTA/MWCNTs effectively enhanced the physical and mechanical properties of AESO. And when the loading of pTA/MWCNTs is 0.8 wt%, optimal reinforcing effect for AESO matrix was observed with the tensile strength and modulus of the pTA/MWCNTs/AESO composite improved by 109% and 409%, respectively. In great contrast, the introduction of pristine MWCNTs without modification leads to the incomplete curing of AESO and thus a great decrease in the mechanical performance, demonstrating the important role of modification by pTA.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 24
·25012-25025
·
IF 2.914
Li Jiaqi,Zhou Siqi,Li Miao,Du Erdeng,Liu Xiang
The removal of acetaminophen (AAP) in aqueous solution by the UV/chlorine process was evaluated. The effect of chlorine dose, the initial AAP concentration, pH value, and UV intensity on the reaction were also investigated. The degradation mechanism and the ecological risk were further discussed. The results indicated that AAP degradation fitted pseudo-first-order kinetics. Compared with UV alone or dark chlorination, the combination of UV and chlorine significantly accelerated the degradation process. The AAP degradation was positively affected by chlorine dose and UV intensity, while negatively affected by the initial AAP concentration and ammonia nitrogen concentration during the UV/chlorine process. The frontier orbital theory analysis shows that the C5 position in the benzene ring of AAP is likely to be the first site attacked by HO• and Cl• radical to form the products. Twelve intermediates were identified by Q-TOF and GC-MS. The possible degradation pathways were also proposed. Luminescent bacteria experiment and ECOSAR prediction both revealed that acute toxicity of AAP degradation could only be partially reduced. Ecological risks during the UV/chlorine process need to be further evaluated.
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PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Guanqing Sun,Huiwen Ge,Jing Luo,Ren Liu
It is highly desirable that surface coatings such as kitchen furniture coatings, hospital wall, furniture coatings and many other coatings used in public areas possess antibacterial properties. Although many antibacterial coatings have already been developed and are now commercially available for some time, effective antibacterial properties often require the addition of antibacterial agents in large amount which deteriorate the mechanical properties of the coatings and hence limit their wide-spread uses. Herein we show the fabrication of a robust and wear-resistant polyurethane-based coatings via addition of fluoro-containing quaternary ammonium compounds (QAC F ) modified silica nanoparticles. The nanoparticles are obtained from a classical Stöber process with a thin layer of thiol groups on the particle surface and the QAC F is then further linked to particle surface through double bond and thiol group reaction. QAC F and its modified silica nanoparticles both show high levels of antibacterial properties toward Gram positive and Gram negative bacteria. Addition of the nanoparticles in as less as 10 wt% in the formulation recipe would be enough to produce an antibacterial coating with excellent anti-wear resistance due to the self-migration of the modified silica nanoparticles to the surface layer of the coating. We have used XPS and confocal microscopy to show the particle migration to the top of the coatings enables us to clarify the mechanism. Compared to coatings with added pure antibacterial reagents, our coating shows enhanced anti-wear property at relatively low particle additions.
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PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Yong Qian,Yijie Zhou,Lan Li,Weifeng Liu,Dongjie Yang,Xueqing Qiu
Aromatic skeleton and polyhydroxyl structure endow biomass lignin with excellent dispersibility, reactivity, and UV-blocking property. Herein, spherical microcapsules loaded with isophorone diisocyanate (IPDI) as core materials were prepared via interfacial polymerization in an oil-in-water emulsion, using sodium lignosulfonate (NaLS) as an emulsifier. Small amount of polydiphenylmethane diisocyanate (PMDI) was added to reinforce the shells of the capsules. The results show that the capsules were 43.4–118.3 μm with a shell thickness of 1.9–2.5 μm. The core fraction was approximately 72.6 wt% and the functional groups of IPDI, such as cyanates, were well preserved. The NaLS-based microcapsules were subsequently mixed and reacted with hexamethylene diisocyanate (HDI) and amine component successively to form new polyurea. When the new polyurea was coated on a steel substrate, it exhibited excellent self-healing property after being scratched. The healed polyurea presents nearly the same anticorrosion ability as the unscratched coating in a solution with high salt concentration. Moreover, the addition of NaLS-based capsules could effectively slow down the aging process of polyurea coatings. The color change of the self-healing polyurea leveled off after 200 h of UV irradiation, while retaining 40% of the breaking strength and 50% of elongation at break. Comparatively, the color of pure polyurea deepened continuously and the mechanical property disappeared completely.
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高影响因子
危险品化学品经营许可证（带存储）