Materials
·
2023
·Vol. 16
·期 11
·4010
·
IF 3.4
Su Zhang,Baoyu Huang,Zenghao Jiang,Junfan Qian,Jiawei Cao,Qiuxia Feng,Jianwei Zhang,Xiaogan Li
Au modified TiO2/In2O3hollow nanospheres were synthesized by the hydrolysis method using the carbon nanospheres as a sacrificial template. Compared to pure In2O3, pure TiO2, and TiO2/In2O3based sensors, the Au/TiO2/In2O3nanosphere-based chemiresistive-type sensor exhibited excellent sensing performances to formaldehyde at room temperature under ultraviolet light (UV-LED) activation. The response of the Au/TiO2/In2O3nanocomposite-based sensor to 1 ppm formaldehyde was about 5.6, which is higher than that of In2O3(1.6), TiO2(2.1), and TiO2/In2O3(3.8). The response time and recovery time of the Au/TiO2/In2O3nanocomposite sensor were 18 s and 42 s, respectively. The detectable formaldehyde concentration could go down as low as 60 ppb. In situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) was used to analyze the chemical reactions on the surface of the sensor activated by UV light. The improvement in the sensing properties of the Au/TiO2/In2O3nanocomposites could be attributed to the nanoheterojunctions and electronic/chemical sensitization of the Au nanoparticles.Keywords:Au modified TiO2/In2O3hollow nanospheres;room temperature formaldehyde sensors;UV activation;in situ DRIFTS
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Nanomaterials
·
2023
·Vol. 13
·期 13
·1985
·
IF 5.3
Hong-Lan Huang,Qi-Kai Shi,Yan Deng,Xiang-Yang Lei,Qing-Huang Zhang,Jin-Ju Chen,Xue-Ran Deng
In order to improve laser transmission efficiency at 1053 nm and 527 nm, a potassium deuterium phosphate (DKDP) crystal (a key component of high-power laser systems) needs a bi-layer antireflection coating system on its incident surface. UV-curable polysiloxane coatings with a refractive index varying from 1.500 to 1.485 were prepared through the polycondensation of a methacryloxy propyl trimethoxylsilane (MPS) monomer with a controllable degree of hydrolysis. Additionally, the influence rule of the coating structure on the refractive index was intensively studied, and the primary factors that dominate the hydrolysis process were discussed. Further refractive index adjustment was achieved using only a small amount of dopant based on the polysiloxane coating with refractive index of 1.485, allowing for high antireflection of the bi-layer coating system at desired wavelengths to be achieved. In addition, high laser damage resistance and remarkable mechanical properties of the coating were simultaneously realized through the incorporation of a minor quantity of dopants, which benefited from the successful modulation of the intrinsic refractive index of the polysiloxane coating.Keywords:controllable hydrolysis;UV-curable polysiloxane coating;refractive index modulation;laser damage resistance;mechanical property
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WATER RESEARCH
·
2023
·
IF 12.8
Yinqiao Zhang,Yang Guo,Jingyun Fang,Kaiheng Guo,Gang Yu,Yujue Wang
Micropollutant (MP) abatement efficiencies are critical information for optimizing water treatment process for cost-effective operations. Nevertheless, due to the vast number of MPs in real water matrices, it is infeasible to measure their abatement efficiencies individually in practical applications. In this study, a probe compound-based kinetic model was developed for generalized prediction of MP abatement in various water matrices by the ultraviolet (UV)/chlorine process. The results show that by measuring the depletion of three probe compounds (ibuprofen, primidone, and dimetridazole) spiked in the water matrix, the exposures of main reactive chlorine species (RCS including chlorine radicals (Cl•), dichloride radicals ( Cl 2 − • ) and chlorine oxide radicals (ClO•)) and hydroxyl radicals (•OH) during the UV/chlorine process could be calculated using the model. Based on the determined exposures, the abatement efficiencies of various MPs in different water matrices (e.g., surface water, groundwater, and wastewater) could generally be predicted with acceptable accuracy by the model without prior water-specific calibration. In addition, the relative contribution of UV photolysis and oxidation with active chlorine, RCS, and •OH to MP abatement could be quantitatively simulated using the model to clarify the abatement mechanism of MPs during the UV/chlorine process. The probe-based kinetic model can thus offer a useful tool to guide practical water and wastewater treatment for MP abatement and to explore the mechanism of UV/chlorine process.
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Processes
·
2023
·Vol. 11
·期 3
·903
·
IF 3.5
Yajie Wang,Xin Dong,Chengfeng Liu,Peng Cheng,Gilles Mailhot
The decolorization of azo dye Orange II using a UVA-Fe3+-PMS-oxalate system was studied. A series of experiments was performed to investigate the effects of several variables, including the pH, PMS dosage, Fe3+concentration, oxalate concentration, and coexisting anions. The results revealed that a lower pH facilitated the decolorization, and relatively high decolorization efficiency (97.5%) could be achieved within 5 min at pH 3.0. The electron paramagnetic resonance (ESR) and radical quenching experiments revealed that SO4•−played a crucial role in the decolorization of Orange II (85.8%),•OH was of secondary importance (9%), and1O2made a small contribution to the decolorization (5.2%). Furthermore, the formation of•OH in the experimental system strongly depended on HO2•/O2•−. These reactive oxidants were able to directly attack the azo bond of the luminescent group in Orange II and initiate the decolorization process. The efficient UVA-Fe3+-PMS-oxalate system showed great application potential in the treatment of wastewater contaminated by azo dyes.Keywords:PMS activation;Orange II;decolorization;UVA irradiation;Fe3+-oxalate complexes
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Kun Wang,Xinge Liu,Shumin Yang,Jianfeng Ma,Genlin Tian,Lili Shang,Zehui Jiang,Qianli Ma
Bamboo, as an important biomass raw material, has a very favorable prospect for Nature-based Solution. Here we provide a method to prepare bamboo-based lignocellulosic nanofibrils (LCNFs) and films with excellent impedance performances by p -toluenesulfonic acid ( p -TsOH) under mild condition. The combined delignification factor (CDF) and combined hydrolysis factor (CHF) were introduced to regulate the hydrolysis severity. The resultant LCNFs with uniform diameter retained a plentiful reactivity without surface functional group changing. The ascendant thermal stability ( T max > 360 °C) of the LCNFs were also obtained. The films made by the LCNFs can block about 99 % UV light with transparency greater than 50 % which exhibited remarkable UV resistance in both UVA and UVB regions. Furthermore, the films presented excellent hydrophobic stability which showed large contact angles (water, 89–99°) and maintained at 64° after 300 s. These properties make bamboo-based materials substitute bamboo for plastics and can be used in aviation, construction, automotive industry, packaging and many other fields, conforming to international initiatives.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Guolin Zheng,Yifan Cui,Zhe Jiang,Man Zhou,Ping Wang,Yuanyuan Yu,Qiang Wang
Personal protective textiles have attracted extensive interest since Corona Virus Disease 2019 has broken out. Moreover, developing eco-friendly, multifunctional waterproof, and breathable surface is of great importance but still faces enormous challenges. Notably, good hydrophobicity and breathability are necessary for protective textiles, especially protective clothing and face masks for healthcare. Herein, the multifunctional composite coatings with good UV-resistant, anti-oxidative, hydrophobic, breathable, and photothermal performance has been rapidly created to meet protective requirements. First, the gallic acid and chitosan polymer was coated onto the cotton fabric surface. Subsequently, the modified silica sol was anchored on the coated cotton fabric surface. The successful fabrication of composite coatings was verified by RGB values obtained from the smartphone and K/S value. The present work is an advance for realizing textile hydrophobicity by utilizing fluorine-free materials, compared with the surface hydrophobicity fabricated with conventional fluorinated materials. The surface free energy has been reduced from 84.2 to27.6 mJ/m 2 so that the modified cotton fabric could repel the ethylene glycol, hydrochloric acid, and sodium hydroxide solutions, respectively. Besides, the composite coatings possesses lower adhesion to deionized water. After 70 cycles of the sandpaper abrasion, the fluorine-free hydrophobic coatings still exhibits good hydrophobicity with WCA of 124.6 ± 0.9°, with overcoming the intrinsic drawback of the poor abrasion resistance of hydrophobic surfaces. Briefly, the present work may provide a universal strategy for rapidly creating advanced protective coatings to meet personal healthcare, and a novel method for detecting RGB values of composite coatings by smartphone.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 43
·48147
·
IF 2.188
Huajun Duan,Wenjing Dong,Xin Wang,Xiaoxiao Tao,Huiru Ma
In this article, aiming to develop the high performance ultraviolet (UV)-curable resin used in the polymer matrix composite, a series of polyurethane acrylate (PUA) resins with the different numbers of allyl terminal groups were elaborately designed and synthesized, in which the contents of hard segments and soft segments were also adjusted simultaneously. The effects of allyl number on properties of PUA were systemically investigated. It was found that allyl number had the negligible effect on the processability as well as positive effect on thermal performances, and all PUA resins exhibited the low viscosity and rapid UV polymerization. Besides, with the change of allyl number in the range of 2–4, PUA resin casting with three allyls possessed the preferable mechanical properties such as 85.1 MPa tensile strength, 3.94 GPa tensile modulus, and 20.7 kJ m −2 impact strength. More importantly, the high strength and high modulus of the composite further demonstrated the wide potentials of the as-prepared PUA resin as the ideal resin matrix candidate for the fiber reinforced polymer composites. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48147.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
·
IF 2.891
Jia Deng,Guangxue Wu,Shoujun Yuan,Xinmin Zhan,Wei Wang,Zhen-Hu Hu
Ciprofloxacin (CIP) is a widely used third generation fluoroquinolone antibiotics, and has been often detected in wastewater treatment plants. Finding an effective way to remove them from wastewater is of great concern. Ultraviolet (UV)/chlorine advanced oxidation process (AOP) has many advantages in micropollutant removal. In this study, CIP degradation in UV/chlorine process was investigated. Only 41.2% of CIP was degraded by UV photolysis and 30.5% by dark chlorination in 30 min, while 98.5% of CIP was degraded by UV/chlorine process in 9 min. HCO 3 − had markedly inhibition, NO 3 − and SO 4 2- had slight inhibition, and Cl − had a marginal inhibition on CIP degradation in UV/chlorine system. The degradation of CIP in UV/chlorine process was mainly attributed to the attack of reactive species. The relative contributions of hydrated electrons (e aq ), hydroxyl radicals (HO ), chlorine atoms (Cl ), and UV photolysis were investigated. Under neutral condition in aqueous solution, CIP degradation had highest pseudo first-order reaction rate constant, in which e aq had the highest contribution, followed by Cl , HO , and UV photolysis. The intermediates and byproducts were identified and the degradation pathway was proposed. The total organic chlorine (TOCl) and biotoxicity were further assessed. CIP and natural organic matters (NOMs) were removed efficiently in real water. UV/chlorine showed the potential for the wastewater treatment containing CIP.
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HIGH PERFORMANCE POLYMERS
·
2018
·
IF 1.047
Lei Wang,Guifen Gong,Junyao Shen,Jinsong Leng
Polyimide (PI)/titanium dioxide (TiO2) composite nanofibers (NFs) with average diameters of 200–250 nm were synthesized via electrospinning. The total number density of dipoles decreased significantly, owing to the porous structures and compact interface between TiO2 NPs and PI matrix. All PI/TiO2 NFs maintain low dielectric constants and losses. For example, the dielectric constants of PI/TiO2-6% NFs are all lower than 2.6, being exposed to temperatures from 25°C to 200°C. Meantime, the dielectric losses of PI/TiO2-6% NFs are below 0.005. For ultraviolet (UV)-light shielding performance, the PI/TiO2 NFs exhibited good UV-light shielding and corresponding anti-photoaging properties. The reason can be ascribed from high UV-light absorption and scattering ability in the TiO2 NPs. The best UV-light absorption (average: 3.71) and corresponding absorption decay (15.13%) were achieved for optimized PI/TiO2-6% NFs. Other fundamental characteristics, such as the thermal stability, mechanical tensile property, and hydrophobicity, were also investigated. Such low dielectric constant PI/TiO2 composite NFs can be alternatively chosen under a longtime UV-light exposing condition.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Yuewei Li,Jie Zhong,Lixin Wu,Zixiang Weng,Longhui Zheng,Shuqiang Peng,Xu Zhang
High performance stereolithography resin (SLR) nanocomposites with different amount of modified polyhedral oligomeric silsesquioxane (m-POSS) nanoparticles, which were synthesized through NH 2 -POSS and 2-isocyanatoethyl methacrylate, have been prepared. By copolymerization POSS nanoparticles can be grafted onto the polymer chains of the SLR matrix. The modified structure of POSS nanoparticles was characterized by Fourier transform infrared spectroscopy and 1 H NMR. The effects of m-POSS nanoparticles on morphologies, mechanical and thermal properties of SLR nanocomposites were investigated in detail. The results show that the tensile and flexible strength were improved by 36.2% and 40% respectively with the addition of 5% w/w m-POSS nanoparticles compared to pristine SLR. The nanoindentation analysis shows a significant amelioration in hardness and reduced modulus by the introduction of m-POSS nanoparticles. The results from thermal studies reveal that the incorporation of m-POSS nanoparticles can significantly enhance the glass transition temperature ( T g ), degradation temperature, char yield, and heat distortion temperature of nanocomposites. Moreover, the incorporation of m-POSS nanoparticles would not only improve the mechanical and thermal properties, but also maintain the high fabrication accuracy of the SLR for 3D stereolithography printing.
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Journal of Physical Chemistry C
·
2019
·
IF 4.309
Ying Zhang,Haiou Zhu,Jilin Zheng,Guangyue Chai,Zongpeng Song,Yanping Chen,Yuanhai Liu,Siyu He,Yongqiang Shi,Yumin Tang,Meng Wang,Wenwen Liu,Lingfeng Jiang,Shuangchen Ruan
Perovskite quantum dots (QDs) have gained significant attention for both fundamental research and commercial applications because of their outstanding optoelectronic properties and tremendous application potentials. Reducing defect density in all-inorganic perovskite QDs is of great importance for performance enhancement. In this work, it is found that the UV-NIR femtosecond laser pulse treatments could increase the photoluminescence quantum yield (PLQY) of the CsPbBr3 perovskite QDs from 71 to 95%. Such an enhancement could be attributed to decrease of the defects after laser exposure, which is consistent with its red-shifted PL and other characterization results. Furthermore, the dynamics of energy transfer from exciton to trapping in irradiated CsPbX3 QDs are studied to gain an insight into the relative strength of exciton-trapping exchange coupling. The results confirm that the trapping defects are decreased by laser irradiation, and the mechanism leading to the enhancement of PLQY is revealed. In addition, the enhanced stability of laser-irradiated CsPbX3 QDs is also testified. Finally, the application of laser-treated perovskite QDs in the liquid crystal display (LCD) backlight film is successfully demonstrated. It is further anticipated that this mechanism is helpful for the design of perovskite-based optoelectronic applications such as LCD technology and light-emitting devices.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2018
·
IF 3.441
Tao Lu,Ying Chen,Min Liu,Wenju Jiang
In this study, a batch experiment was used to investigate the degradation of real evaporative condensing liquid of shale gas wastewater (ECLSGW). We showed that compared to the O 3 , ultraviolet (UV), UV/TiO 2 , and O 3 /UV/TiO 2 processes, the O 3 /UV process has better performance in removing the chemical oxygen demand (COD) and total organic carbon (TOC) of ECLSGW under the same conditions. The effects of initial pH (3–12), ozone flow rate (0.1–0.5 L/min), UV power (15–50 W), and reaction time (0–60 min) on the degradation of ECLSGW via the O 3 /UV process were investigated using a single-factor experiment. Moreover, the optimal experimental conditions were obtained using a quadratic polynomial prediction model (R Adj 2 =0.9961) that was obtained from the central composite design (CCD) of the response surface methodology (RSM). Under optimal experimental conditions, the COD and TOC removal efficiency reached 93.12 and 95.5%, respectively. In addition, gas chromatography–mass spectrometry analysis showed that the O 3 /UV process could nearly completely mineralize organic pollutants in the ECLSGW. Hydrogen peroxide (H 2 O 2 ) and hydroxyl radical ( OH) were identified by manganese dioxide (MnO 2 ) and tert-butanol (TBA). The mechanism research showed that OH plays an important role in the degradation of organic pollutants. In summary, the O 3 /UV process is an effective method to degrade ECLSGW.
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