POLYMER ENGINEERING AND SCIENCE
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2019
·
IF 1.92
Lixiang Shen,Ya Pan,Heqing Fu
A super hydrophobic cotton fabric was successfully prepared by a facile dip-coating method using a synthetic fluorine-free and UV curable super hydrophobic coating solution without additional particles. The obtained cotton fabric exhibited super hydrophobic property with a water contact angle above 159.5° and sliding angle 7.5°. Moreover, the treated cotton fabric could retain its super hydrophobic performance even after abrasion and accelerated laundering, as well as for different kinds of corrosive liquids. The coated cotton fabric was used to make up a surface tension-driven, gravity-assisted, floating oil–water separation device with separation efficiency above 99%. Additionally, the oil–water separation efficiency of super hydrophobic cotton fabric always was above 98% after 30 recycle times for cyclohexane–water mixture. POLYM. ENG. SCI., 59:E452–E459, 2019. © 2019 Society of Plastics Engineers
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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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2019
·
IF 1.433
Sangmin Lee,Jaebum Son,Dong Geon Kim,Joonbum Choi,Yong Kyun Kim
Production of plastic scintillators using 3D printing technology has gained increased interest, and related researches are being published. However, research results show that the performance of plastic scintillators, such as light yield or decay time, is still poor compared to that of commercial products. In order to improve the scintillator performance, a UV-curable solution was prepared by applying ADS148BE, a new wavelength shifter, from which a plastic scintillator was fabricated using a UV LED curing machine. The maximum emission wavelength of the prepared scintillator occurred at 429 nm. The transmittance at peak emission was 49%. The scintillation efficiency was measured to be 43% of BC408 (Saint-Gobain Crystals). The light yield was determined to be 35% of BC408. It is about 1.9 times better than that of a scintillator fabricated by a UV lamp of a previously published paper [12]. The light output was estimated as 33.7% of BC408. The decay time was approximately 2.46 ns. This is the relative value measured after setting the decay time of the reference scintillator to match the manufacturer’s data. Compared to the UV-curable plastic scintillator of previously reported studies, we have improved the overall performance of our sample and will be able to make precise shapes with a 3D printer.
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LIMNOLOGY
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2018
·Vol. 20
·期 2
·173-179
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IF 1.13
Du Jingjing,Qv Mingxiang,Li Ke,Yin Xiaoyun,Meng Fanxiao,Yang Jingchao,Ma Chuang
The impacts of three commonly used benzophenone-type UV filters including benzophenone (BP), 2-hydroxy-4-methoxy-benzophenone (BP3), and 2-hydroxy-4-methoxy-benzophenone-5-sulfonicacid (BP4) were assayed in vitro using a cladoceran Daphnia carinata . The 24-h LC50 on D. carinata calculated for BP, BP3, and BP4 was 8.37, 2.18, and 82.27 mg l −1 , respectively. BP3 and BP4 significantly impacted on the time of D. carinata first molting at a concentration of 0.1 µg l −1 . BP4 had an inhibitory effect on D. carinata molting and BP3 had an inhibitory effect on D. carinata pregnancy at a concentration of 1 µg l −1 . Furthermore, BP4 significantly inhibited the number of D. carinata first brood per female at a concentration of 10 µg l −1 . All of the endpoints from acute and chronic toxicity demonstrated that the hydroxy group in BP3 and BP4 significantly enhanced the toxic effect compared to BP. Therefore, the toxicity of BP-type UV filters is related to their molecular structure.
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MATERIALS LETTERS
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2019
·
IF 3.019
Feng Gao,Hao Sun,Haobo Zhang,Jue Cheng,Junying Zhang
The fabrication of submicro/nano porous thermosetting resin with defined cell size and distribution remains a challenge. Diazirine was induced into the epoxy resin matrix as the on-demand UV initiated chemical foaming agent (CFA) under room temperature. Cell dimension became tunable ranging from around 1 mm to tens nm by varying the matrix curing extent when the UV took effect. Curing extent of the matrix was monitored by measuring the rheological properties in the real time. UV foaming showed the potential to be used for the control of cell morphology in porous thermosetting materials.
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RSC Advances
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2018
·Vol. 8
·期 3
·1427-1435
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IF 2.936
Zhigang Yi,Juan Wang,Qiong Tang,Tao Jiang
Although many studies have been focused on the photochemistry of antibiotics, the roles of reactive species in photolysis and the effects of dissolved substances on antibiotic photochemical behavior have been poorly examined. The photolytic behaviors of sulfamethazine (SMN) in pure water were investigated via adding different scavengers to quench the active species. Results showed that decomposition of the triplet-excited state of SMN (3SMN*) by direct photolysis was the main path of SMN photolysis in water. Moreover, self-sensitized SMN cannot be ignored during SMN photodegradation. The main photoproducts of SMN were identified by LC-MS/MS, which indicated that SMN could not be mineralized although the photolysis under UV was effective. The effects of Cl−, NO3−, and fulvic acid (FA) (common substances in natural water) on SMN photolytic behaviors were also studied. The triplet-induced halogenation of SMN increases the ionic strength and reduces the ground state SMN; these are the primary causes of promotion of SMN photolysis by Cl−. More ˙OH produced in the presence of NO3− could promote SMN photolysis. Competitive absorption of photons of FA with SMN and ROS scavenged by FA were the main reasons for the inhibition of SMN photolysis. The research findings are helpful for further studies on the environmental risks of ACs in natural waters and promoting the development of AC pollution treatment technology.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 9
·48420
·
IF 2.188
Peng Xu,Chaofeng Li,Xinwei Chang,Yanwu Zhang
Numerous researches about the modification and application of cyclohexanone formaldehyde resins (CFR) have been conducted, few of them involve in the UV-curing of unsaturated CFR with thiols. Thus, CFR are synthesized using the rehydrated magnesium-aluminum hydrotalcite as the catalyst and double bonds are introduced by capping the chain ends with 5-norbornene-2,3-dicarboxylic anhydride. Through monitoring the conversion of double bonds with FTIR, the UV-curing behavior of unsaturated CFR in the presence of pentaerythritol tetra (3-mercaptopropionate) is studied. The results show that the conversion of double bonds can reach to 64.1% at 0.66 mW cm −2 of UV light intensity when the molar ratio of double bonds to sulfhydryl groups is 1:1 in the presence of benzoin dimethyl ether (1% of molar amount of double bonds). Considering the similarity between UV-curing of thiols-double bonds and thermo-curing of amine-epoxy, one diffusion controlled kinetics model is derived and it shows good fitness. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48420.
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WATER RESEARCH
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2023
·
IF 12.8
Penghui Du,Wen Liu,Qiang Zhang,Peng Zhang,Chen He,Quan Shi,Ching-Hua Huang,Junjian Wang
Peracetic acid combined ultraviolet (UV/PAA) process has garnered growing attention as a promising advanced oxidation process (AOP) for wastewater treatment, but the corresponding transformation of ubiquitous dissolved organic matter (DOM) under this AOP remains unknown. This study systematically investigated the changes in characteristics and composition of DOM under UV/PAA, as well as the underlying mechanisms by multiple spectroscopic analyses and Fourier transform ion cyclotron resonance mass spectrometry. UV/PAA treatment dramatically decreased aromaticity, apparent molecular weight, and fluorescent abundance of DOM with the production of more oxidized and saturated compounds. The reactive species (i.e., · OH and CH 3 C(O)O · /CH 3 C(O)OO · ) in UV/PAA contributed primarily to DOM changes but showed different reaction selectivity and mechanisms. · OH reacts with DOM components and mainly yields oxygenation products via a radical addition pathway. Comparatively, the electron transfer route is more likely to occur in CH 3 C(O)O · /CH 3 C(O)OO · -induced DOM transformation. Aside from oxygenation products, electron transfer could exclusively generate decarboxylation products and distinguishes CH 3 C(O)O · /CH 3 C(O)OO · -based AOPs from · OH-based AOPs. These findings significantly improve knowledge of DOM alterations under UV/PAA AOP at both the bulk and molecular levels.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2022
·
IF 2.042
Zhen Zhou,Xing Zhang,Tong Zhang,Wen Ma,Xiaojun Fang
Haloacetamides (HAcAms) is ubiquitously found in drinking water, which exhibits strong cytotoxicity and genotoxicity compared with conventional disinfection byproducts (DBPs). Herein, the degradation of HAcAms containing dichloroacetamide (DCAcAm) and trichloroacetamide (TCAcAm) by UV/peroxymonosulfate (PMS) process was studied. Degradation kinetics of DCAcAm and TCAcAm conformed to the first-order model, and the corresponding reaction constants were 2.27 × 10−3 and 1.94 × 10−3 s−1, respectively. The degradation rate raised with the increment of PMS dosage. During the investigation of water matrices including Cl–, HCO3–, and humic acid (HA), HCO3– and HA inhibited the degradation process whereas the influence of Cl– on the degradation was negligible. As evidenced by trapping test, •OH played the crucial role in the degradation of HAcAms. During the UV/PMS process, dechlorination was the main process. TCAcAm could be oxidized to DCAcAm and acetamide, and further mineralized to Cl–, CO2, H2O, NO2–, and NO3–. Our results demonstrated that UV/PMS could be an effective technique to degrade HAcAms in dinking water.
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MATERIALS RESEARCH BULLETIN
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2022
·
IF 5.6
Jiaxin Yang,Ming Feng,Ziyu Chen,Rui Xu,Adnan Khan,Kang Zhang,Dongdong Han,Xu Sang,Jinyue Xie,Lisa Liu,Feng Song,Wei Huang
A 3D-printing-compatible approach is reported to construct special-shaped silica glass components. Printable silica-polymer slurries are optimized to obtain the shear-thinning colloidal suspensions with high solid loading and tunable rheological properties. The effects of heat treatment methods and solid loadings on the vitrification of printed parts are explored. To reveal the printing adaptability, the micro kinetic mechanism of free radical photopolymerization is introduced into the thickness-time equation to confirm the printing parameters. Taking into account the requirements of 3D printing for the slurry rheology and the linear shrinkage, a series of customizable silica glasses are constructed based on the parameters predicted by the model. Surprisingly, silica glasses show exceptionally smooth surfaces with a roughness of about 4 nm. The preceding observations confirm the obvious competitiveness of 3D printing relative to traditional glass forming methods, as well as the additional benefits of the freedom to design and produce complex geometries.
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EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Sujuan Zhang,Zheng Wang,Irum Rafique,Zaijun Lu
Room-temperature fast-curing polybenzoxazine hybrid thermosets were synthesized by crosslinking allyl-containing benzoxazine oligomer (O-ABZ) and thiol-containing siloxane oligomer (O-TS) under UV irradiation via thiol-ene click reaction. The O-ABZ was synthesized through the thermally-activated ring-opening polymerization of mono-functional benzoxazine (ABZ) obtained via Mannich reaction of the p -cresol, allylamine, and paraformaldehyde. The O-TS was synthesized by the co-hydrolysis and condensation of 3-mercaptopropylmethyldimethoxysilane with dimethyldimethoxysilane. The structures and molecular weights of O-ABZ and O-TS were characterized by FT-IR, 1 H NMR, and SEC. The kinetics of thiol-ene click reaction were studied by FT-IR spectroscopy. The results showed that the curing reaction of polybenzoxazine/polysiloxane hybrid resin proceeded rapidly at room temperature under UV irradiation. The conversions of thiol and allyl groups were 56.6% and 58.3% in the first 30 s, respectively. Nearly complete curing was obtained after 3 min of UV irradiation. Meanwhile, the gel contents of the resulting resin were greater than 95%. On the other hand, the crosslinking density of the hybrids could be tuned by adjusting the thiol content of the siloxane oligomers. Their physical states transformed from rubber to plastic.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Ling Tan,Ran Mao,Peidong Su,Jia Gu,Huan Chen,Fang Jiang,Xu Zhao
Denitrification is an effective strategy to control eutrophication caused by excessive nitrate in water. However, the comparatively low efficiency of nitrate removal and N 2 selectivity remains a challenge in the denitrification process. Herein, this study proposed a novel photochemical denitrification process by introducing hydrated electron (e aq - ) to reduce nitrate in UV/sulfite system. The results indicated that the optimized UV/sulfite system could effectively reduce nitrate to N 2 with a nearly 100% denitrification efficiency in 90 min. e aq - was identified as the mainly reactive species to achieve rapid removal of nitrate and nitrite, and the result was verified by quenching and laser flash photolysis tests. Benefiting from the high dispersion of e aq - in water and the rapid reaction rate between e aq - and the target, the generated N 2 O is susceptible to be reduced, leading to a high selectivity of N 2 that was confirmed by 15 N-isotopic. Besides, thermodynamic results based on the density functional theory (DFT) calculations suggested that the photochemical denitrification process was exothermic process and tend to transform to N 2 . Significantly, UV/sulfite system applied in the nickel-plating wastewater showed high denitrification efficiency, demonstrating that the novel photochemical denitrification process is promising for practical wastewater treatment .
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FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 3
·489-497
·
IF 1.797
Liu Ya,Wang Xueming,Li Nana,Wang Xiaoyin,Shi Lei,Wu Enjie,Wang Rui,Shan Mingjing,Zhuang Xupin
Nanofiber mats have received considerable attention from researchers in the field of particulate protection. In this study, polyvinylidene fluoride (PVDF) nanofiber mats were prepared on a large scale by a solution blowing process, and then crosslinked by ultraviolet (UV)-radiation using trimethylolpropane tri-acrylate (TMPTA) as a crosslinker. The structure, morphology, mechanical and thermal properties, and protective performance of the nanofiber mats were evaluated. Results show that the addition of TMPTA and UV treatment decreased the diameter of the nanofibers and enhanced the mechanical properties, air permeability, and moisture permeability. Nanofiber mats show higher filtration and lower filtration resistance compared with a commercial product. Furthermore, the nanofiber mats were bonded with Nylon 6 fabric, which showed good performance as a novel functional layer in protective clothing.
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危险品化学品经营许可证（带存储）