JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xiaoxiao Zhang,Zhonglin Chen,Jing Kang,Shengxin Zhao,Binyuan Wang,Pengwei Yan,Fengxia Deng,Jimin Shen,Wei Chu
In this study, kinetics, influencing factors and potential mechanisms involved in the degradation of chloral hydrate (CH) by UV/peroxymonosulfate (PMS) process were demonstrated. The degradation rate of CH could reach 89.6% by UV 254 /PMS process, significantly exceeding UV 300 /PMS (0.7%), UV 350 /PMS (6.3%), UV 254 direct photolysis (9.0%) and PMS alone (0.0%) processes. CH degradation in UV 254 /PMS system followed pseudo first-order degradation kinetics with an apparent rate constant of 0.186 min −1 , which was suppressed by Cl − and HCO 3 − . The optimal pH for CH degradation was around 5.0. Direct mineralization accounted for the CH degradation in UV/PMS system. Interestingly, the addition of PMS at the neutral condition before UV irradiation transferred CH into trichloroacetic acid (TCAA). The transformation efficiency of CH into TCAA at 10 min was enhanced from 2.17%–40.38% with the elevation of initial pH from 7.0–8.0. The subsequent exposure of UV lamps ceased the transformation of CH into TCAA and facilitated the direct mineralization of CH, but it did not work in the refractory TCAA degradation. Finally, it was revealed that HO predominantly participated CH degradation in UV/PMS process, while O 2 − was responsible for the transformation of CH into TCAA by addition of PMS before UV irradiation.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1527-1540
·
IF 5.044
Tang Zuwu,Miao Yanan,Zhao Jing,Xiao He,Zhang Min,Liu Kai,Zhang Xingye,Huang Liulian,Chen Lihui,Wu Hui
Hydrogels are attractive due to their various applications in the fields of biomedical materials, cosmetics, and biosensors. To enhance UV protection and prevent skin penetration behaviors, inspired by the mussel adhesive proteins, the functional polydopamine (PDA) is employed herein to fabricate polydopamine/carboxymethyl cellulose/polyacrylic acid (PDA/CMC/PAA) adhesive hydrogels. To disperse PDA nanoparticles well in the PAA matrix, dopamine was self-polymerized in CMC solution to form PDA/CMC complex. Acrylic acid was polymerized in PDA/CMC complex solution and cross-linked to construct UV-resistant PDA/CMC/PAA hydrogel. The morphology, rheological behavior, mechanical properties and adhesion strength of PDA/CMC/PAA hydrogels were studied by scanning electron microscopy, rotational rheometer, universal test machine. Owing to the hydrogen bonding interaction between the PDA/CMC complex and PAA, the PDA/CMC/PAA hydrogels showed high resilience and compressive strength to withstand large deformation. The hydrogels exhibited strong adhesion to various substrate surfaces, such as stainless steel, aluminum, glass and porcine skin. The biocompatibility and UV-shielding properties were investigated through culture of cells and UV irradiation test. The adhesiveness of PDA promoted cell adhesion and provided the PDA/CMC/PAA hydrogels good biocompatibility with 96% of relative cell viability. The hydrogels possessed excellent UV-shielding ability to prevent collagen fibers from being destroyed during UV irradiation, which has promising potential in the practical applications for UV filtration membrane and skin care products.
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Polymers
·
2020
·Vol. 12
·期 12
·3005
·
IF 3.426
Yunxin Fan,Yan Song,Na He,Fei Cheng,Xiaojiao Jiao,Guoqiao Lai,Xilin Hua,Xiongfa Yang
A kind of hyperbranched silicone containing macrophotoinitiators (HBSMIs) were synthesized from 2-hydroxy-2-methyl-1-phenyl propanone (HMPP) and the UV-curing behaviors of HBSMIs were investigated in UV-cured transparent polyurethane-acrylate (PUA) coatings. HBSMIs show higher UV-initiating efficiency than HMPP. The migration of HBSMIs from the UV-cured coatings can be as low as 1.7–6.0 wt%, which is obviously lower than the migration of HMPP. There is a remarkable improvement of the tensile strength of the UV-cured materials initiated by HBSMI in comparison to that of the materials prepared with the same PUA initiated by HMPP. Especially for the UV-cured materials prepared from PUA with 20 wt% 1,1,1-tris(hydroxymethyl)propane (TMP), the tensile strength and the strain at break increased from 6.81 MPa to 12.14 MPa and from 43.0% to 71.9%, respectively. The fraction of improvement for the tensile strength and the strain at break is as high as 78.9% and 67.2%, respectively. The coatings prepared with HBSMI also have better UV resistance ability than those coatings prepared with HMPP because they turn slightly yellow when they are aged by UV for about 15 min while the coating prepared with 4 wt% of HMPP will turn yellow only aged by UV for 2 min. These results suggest that preparation hyperbranched silicone containing macrophotoinitiators will be one of the good strategies to improve the curing efficiency of the UV-curing system, reduce the migration of UV initiator from cured material, improve the mechanical and UV resistance performance of UV-cured materials.Keywords:UV-cured coating;hyperbranched silicone containing macrophotoinitiators;migration;the tensile strength
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INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Bin Liang,Jieyi Chen,Xiulan Guo,Zhuohong Yang,Teng Yuan
Bio-based coatings gradually become an ideal substitution for the non-renewable petroleum-based coatings due to the features of environmental friendliness and low cost, and the preparation of high-performance bio-based coatings via a facile method is highly desirable. Herein, bio-based organic-inorganic hybrid UV-curable coatings with self-cleaning property were prepared in a solvent-free one-pot method. In this coating system, synthesized epoxidized castor oil (ECO) was used as a coating precursor, glycidyl methacrylate (GMA) and 3-glycidoxypropyltrimethoxysilane (GPTMS) were used as reactive diluents, and triarylsulfonium salt (TAS) was used as an effective cationic photoinitiator. Besides, commercial epoxidized soybean oil (ESO) was employed as another coating precursor to compare with ECO. The chemical structure of the synthesized ECO was confirmed by 1 H NMR and FT-IR. The occurrence of double bond radical copolymerization, epoxy ring-opening copolymerization and trialkoxysilyl sol-gel reaction in the cured films was proved via ATR-FTIR. The properties of the films cured with different GPTMS contents were investigated. Dynamic mechanical analysis (DMA) results revealed that EC films showed better performance than ES films, and the addition of GPTMS reduced the glass transition temperature ( T g ) and crosslinking density ( ν e ) of the cured films. However, the addition of GPTMS increased the peak temperature ( T p ) and char yield ( W char ) of the cured films, indicative of the enhancement in thermal stability. SEM results indicated that the incorporation of GPTMS in the cured films facilitated the obtainment of a smooth surface. Furthermore, all of EC films were hydrophobic, and they also exhibited self-cleaning property. In addition, they showed excellent hardness and acid resistance. Therefore, this study provided a facile approach to preparing bio-based organic-inorganic hybrid UV-curable films with self-cleaning property, and the high performances of these cured films made them potential for practical applications.
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Journal of Coatings Technology and Research
·
2020
·Vol. 17
·期 5
·1413-1423
·
IF 1.815
Gao Shan,Li Hongqiang,Lai Xuejun,Zeng Xingrong
With the increasing occurrences of industrial oily wastewater emissions and oil spills, considerable efforts have been made to develop superhydrophobic materials for oil–water separation. Herein, we report a facile dipping-UV curing approach to fabricate superhydrophobic organosilicon/silica hybrid coating with crosslinked network structure on cotton fabric via thiol-ene reaction between thiol-functionalized silica nanoparticles (SH-SiO 2 NPs) and acryloyloxy-terminated polydimethylsiloxane (A-PDMS-A). With the optimized mass ratio of SH-SiO 2 NPs to A-PDMS-A at 0.2, the water contact angle of the fabric reached 155° and the water sliding angle was 8°, exhibiting excellent water repellency. Furthermore, the superhydrophobic cotton fabric possessed self-cleaning ability and good surface stability. In addition, the fabric was successfully applied for effective oil–water separation, and the separation efficiency reached up to 99.06%. Even after 15 cycles, the separation efficiency still maintained 98.93%, demonstrating excellent reusability. Our findings stand out as a new tool to fabricate UV-curable superhydrophobic coating on cotton fabric for efficient oil–water separation.
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ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Abdul Haleem,Hui-Juan Li,Peng-Yun Li,Chuan-Shan Hu,Xi-Chuan Li,Jia-Yun Wang,Sheng-Qi Chen,Wei-Dong He
Macro-porous poly(lauryl acrylate) cryogel sheets as oil-sorbents were prepared through UV-radiation cryo-polymerizations in 1, 4-dioxane at low temperatures (−5, −2 and 0 °C) within 30 min. The influences of total monomer concentration, crosslinking monomer amount and polymerization temperature on the formation of cryogels were studied. The chemical structure and porous morphology were characterized through the techniques of Fourier transform infrared spectroscopy , thermal gravimetric analysis , contact angle measurement and scanning electron microscopy, confirming the features of high hydrophobicity , macro-porosity and good thermal stability. As well, the comparison between conventional gels prepared at room temperature and cryogels at lower temperatures was made, showing the higher rate of cryo-polymerization than conventional polymerization under the same UV-radiation condition. The swelling investigation was carried out with several organic solvents and oils. Enhanced performance of oil absorption was observed for those cryogels considering the absorption capacity and absorption rate. Variation of initiator amount and acrylate monomers could also modulate the absorption capacity. Those cryogel oil-sorbents exhibited wide adaptability, good reusability and high-temperature tolerance. Thus, this rapid and low-cost fabrication opens out a novel pathway to prepare efficient oil-sorbents used in waste water treatment .
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yiping Feng,Mengyao Shen,Zhijie Xie,Ping Chen,Lin-Zi Zuo,Kun Yao,Wenying Lv,Guoguang Liu
In this study, the photo-transformations of bulk C 3 N 4 (CN) and oxidized C 3 N 4 (OCN) under UV-irradiation were examined. Through NO 3 − release measurements, we found that the photo-transformation rate of OCN is higher than that of CN. Various characterization results revealed the structural and chemical properties changes of CN and OCN after photo-transformation. We proposed that under reactive oxygen species attack, CN and OCN were gradually broken into smaller fragments and finally mineralized into NO 3 -, CO 2 , and H 2 O through the circular reactions of deamination-hydroxylation-decarboxylation. Through the zeta potential measurements and sedimentation experiments, the influence of photo-transformation on the water stabilities of CN and OCN were assessed. The stability of CN in water increased while the water stability of OCN decreased after photo-transformation, implying that the changes to C 3 N 4 -based materials caused by photo-transformation may significantly impact their environmental behaviors. Moreover, the photocatalytic activities of the photo-transformed OCN and CN substantially decreased, indicating that the structural changes might be the main reason for their photocatalytic activity loss. These findings highlight the non-negligible influence of photo-transformation on the fate of C 3 N 4 in aquatic environments, as well as on the photochemical stability during its use.
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FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 1
·111-118
·
IF 1.797
Liu Jiajia,Wang Wei,Yu Dan,Zhao Kai
Polyester (PET) fabric is an important fabric to make sportswear due to its good mechanical strength, wear resistance and low cost, but poor hygroscopicity will accumulate moisture and excessive heat of human body which thereby causing thermo-physiological dicomfort. To obtain satisfying moisture-wicking, hydroscopic and fast-dry properties, facile and efficient single-sided click chemistry was used to substitute traditional methods. Firstly, PET fabric was alkali treated and modified with 3-mercaptopropyltrimethoxysilane to obtain thiol groups. Then it was gradiently grafted with potassium 3-sulfopropyl acrylate by thiol-ene click chemistry under single-sided ultraviolet (UV) irradiation to enlarge effects. The reaction was proved by FTIR and Ellman method, the surface morphology was observed by SEM, and the mass loss at different temperatures in thermalgravimetry (TG) test illustrated the quantity change of grafting. The results demonstrated that the resultant fabric has good performance of moisture absorbing and sweat releasing, fast drying as well as outstanding antistatic and soil release properties.
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WATER RESEARCH
·
2020
·
IF 9.13
Yinqiao Zhang,Huijiao Wang,Yang Li,Bin Wang,Jun Huang,Shubo Deng,Gang Yu,Yujue Wang
The ultraviolet/chlorine (UV/Cl 2 ) process is an emerging advanced oxidation technology for micropollutant abatement in water and wastewater treatment . However, the application of the conventional UV/Cl 2 process in decentralized systems is limited by the transport and management of liquid chlorine. To overcome this limitation, this study evaluated an electrochemically driven UV/Cl 2 (E-UV/Cl 2 ) process for micropollutant abatement under conditions simulating decentralized water treatment . The E-UV/Cl 2 process combines UV irradiation with in situ electrochemical Cl 2 production from anodic oxidation of chloride (Cl − ) in source waters. The results show that with typical Cl − concentrations present in water sources for decentralized systems (30–300 mg/L Cl − ), sufficient amounts of chlorine could be quickly electrochemically produced at the anode to enable E-UV/Cl 2 process for water treatment. Due to its multiple mechanisms for micropollutant abatement (direct photolysis, direct electrolysis, Cl 2 -mediated oxidation, as well as hydroxyl radical and reactive chlorine species oxidation), the E-UV/Cl 2 process effectively eliminated all micropollutants (trimethoprim, ciprofloxacin, metoprolol, and carbamazepine) spiked in a surface water in 5 min. In contrast, at least one micropollutant with ∼20–80% residual concentrations could still be detected in the water treated by 10 min of UV irradiation, chlorination, electrolysis, and the conventional UV/Cl 2 process under similar experimental conditions. The electrical energy per order (E EO ) for micropollutant abatement ranged from 0.15 to 1.8 kWh/m 3 for the E-UV/Cl 2 process, which is generally comparable to that for the conventional UV/Cl 2 process (0.14–2.7 kWh/m 3 ). These results suggest that by in-situ generating Cl 2 from anodic oxidation of Cl − , the E-UV/Cl 2 process can overcome the barrier of the conventional UV/Cl 2 process and thus provide a promising technology for micropollutant abatement in decentralized water treatment systems.
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CHEMOSPHERE
·
2020
·
IF 5.778
Tianxin Zhu,Jing Deng,Mengyuan Xu,Anhong Cai,Cheng Ye,Jun Li,Xueyan Li,Qiongsong Li
The degradation of N,N -diethyl- meta -toluamide (DEET) in aqueous solution by the UV/monochloramine (UV/NH 2 Cl) process was examined systematically in this study. DEET was resistant to UV photolysis and chloramination, while the synchronous combination of UV irradiation and NH 2 Cl can effectively eliminate DEET, which was caused by the generation of hydroxyl radicals and reactive chlorine species. The former played the critical role in DEET degradation, while the contribution of the latter can be ignored. Under all investigated experimental conditions, DEET degradation in the UV/NH 2 Cl process followed the pseudo-first-order kinetic model. The water quality parameters exerted the complicated impact. Reducing solution pH and raising water temperature both favored the DEET removal. The presence of sulfate, humic acid and fulvic acid accelerated the degradation, while the introduction of bicarbonate and high-concentration chloride retarded the removal. The plausible degradation pathways of DEET in the UV/NH 2 Cl process were proposed through the combination of QTOF/MS analysis and DFT calculation, and mainly involved in the cleavage of C–N bond, dealkylation, mono- and polyhydroxylation. The acute toxicity of reacted solution underwent a trend of first increasing and then decreasing with the prolonged irradiation time, which can be well illustrated by quantitative structure-activity relationship analysis. Electrical energy per order was employed to determine the energy consumption and the optimal conditions were determined as UV fluence of 369.9–493.2 mJ cm −2 and NH 2 Cl dosage of 5–20 mg L −1 .
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Coatings
·
2020
·Vol. 10
·期 4
·349
·
IF 2.436
Zihui Liang,Zezhu Zhou,Binghai Dong,Shimin Wang
To obtain a superhydrophobic surface, SiO2nanoparticles are deposited on the surface of silk fabric (SF) by Plasma Enhanced Chemical Vapor Deposition (PECVD) to form a hierarchical roughness structure. In addition, a durable superhydrophobic SiO2@silk fabric was further prepared by hexamethyldisilazane (HMDS) modification. Compared with bare silk, the surfaces of the SiO2@silk fabric exhibit higher surface roughness and excellent superhydrophobic activity, with a contact angle (CA) of ~152°. The excellent UV resistance of SiO2@silk fabric was confirmed with high UV protection factor (UPF) values and a low UV transmittance. Moreover, both the laundering durability and chemical stability of the SiO2@silk fabric were improved. Overall, this method is recognized as a promising approach to produce high-end fabric development. It can also guide the design of multifunctional fiber materials in the future.Keywords:silk fabric;superhydrophobic coating;UV resistant;durability;HMDS
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International Journal of Environmental Research and Public Health
·
2020
·Vol. 17
·期 5
·1572
·
IF 2.849
Shi-ming Li,Dan Liu,Yi-lin Liu,Bin Liu,Xing-huang Chen
Ultraviolet B (UV-B, 280–320 nm) radiation causes complex molecular reactions in cells, including DNA damage, oxidative stress, and apoptosis. This study designed a mixture consisting of quercetin, luteolin and lycopene and usedCaenorhabditis elegansas a model to study the resistance of these natural chemicals to UV-B. Specifically, we have confirmed that quercetin and its mixture can increase the resistance ofCaenorhabditis elegansto UV-B through lifespan test, reactive oxygen species level assay, germ cell apoptosis test, embryonic lethal test and RT-qPCR experiments. The results show that quercetin and its mixture prolonged the lifespan of UV-B-irradiatedCaenorhabditis elegansand reduced abnormal levels of reactive oxygen species, embryo death, and apoptosis induced by UV-B. The protective effect of quercetin and its mixture may be attributed to its down-regulation ofHUS-1,CEP-1,EGL-1andCED-13.Therefore, the results of this research could help the development of UV-B radiation protection agents.Keywords:Caenorhabditis elegans;UV-B;quercetin;luteolin;lycopene;apoptosis;stress resistance
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危险品化学品经营许可证（带存储）