CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Min-Yong Lee,Wen-Long Wang,Qian-Yuan Wu,Nan Huang,Zi-Bin Xu,Hong-Ying Hu
Dodecyl dimethyl benzyl ammonium chloride (DDBAC), a non-oxidizing biocide, is commonly used in municipal wastewater reverse osmosis system. It has been used also as an ingredient in fabric softeners, disinfectants, detergents, phase transfer agent and numerous personal skin care products. In this study, the DDBAC degradation efficiency achieved using UV and persulfate (PS) oxidation processes was investigated. Substantial synergistic effects on DDBAC degradation were found when UV and PS oxidation processes were combined. During the UV/PS process, UV photolysis and reactions with radical species accounted for 42.7% and 57.3%, respectively, of DDBAC degradation. The OH and SO 4 − radicals accounted for 4.6% and 52.7%, respectively, of DDBAC degradation. The calculated k OH,DDBAC and k SO 4 - ,DDBAC rate constants were (1.45 ± 0.16) × 10 9 and (1.51 ± 0.02) × 10 9 M −1 s −1 , respectively. The k obs rate constant for DDBAC degradation increased from 0.047 to 0.150 min −1 when the PS dose was increased from 0.05 to 1.45 mM. The presence of natural organic matter (NOM), HCO 3 − /CO 3 2− , and NO 3 − adversely affected DDBAC degradation. Five main intermediates were identified by high performance liquid chromatography quadrupole time-of-flight tandem mass spectrometry. The proposed DDBAC degradation pathway involves benzyl-nitrogen bond cleavage (or subtraction of hydrogen from the alkyl chain), demethylation, hydroxylation, and hydrogen subtraction. UV/PS treatment decreased the acute toxicity of the DDBAC solution in less than 15 min. However, the residual toxicity indicated that toxic oxidation transformation products were formed when DDBAC was treated using the UV/PS process.
研究领域:
环境科学
·
化学工程
·
毒理学
✓ 已验证
DOI
高影响因子
Food Analytical Methods
·
2020
·Vol. 13
·期 8
·1673-1680
·
IF 2.667
Cheng Zhu,Ran Qin,Liu Jie,Deng Xing,Qiu Huidong,Jia Zhengfu,Su Xiaodong
Preservatives and sweeteners are always added in the food production process, which can extend the life and flavor of food. Benzoic acid and saccharin sodium are commonly used as preservatives and sweeteners respectively. Phenyllactic acid as a natural preservative, mainly produced by phenylalanine fermentation, may exist in fermented food. The objective of the current study is to develop a reverse-phase HPLC-UV method for simultaneous determination of benzoic acid, sorbic acid, phenyllactic, phenylalanine, and saccharin sodium in vinegar. They were separated on Sapphiresil TM (C 18 ) column (250 × 4.6 mm, 5 μm) with a mobile phase consisting of methyl alcohol:ammonium acetate buffer (pH 6.44; 0.02 M) (20:80, v/v) ran in isocratic mode at a flow rate of 1 mL/min. Complete baseline separation of five analytes was achieved in < 12 min, the linear range was 0.25–50 μg/mL with a correlation coefficient R 2 value > 0.9975, the method was validated with recoveries in the 96.93 to 118.42% range, and RSD was 0.39–6.21%. The detection limits of phenylalanine, benzoic acid, saccharin sodium, sorbic acid, and phenyllactic acid were 0.25, 0.01, 0.01, 0.025, and 0.05 mg/L. This method could be used for determining of benzoic acid, sorbic acid, phenyllactic acid, phenylalanine, and saccharin sodium in vinegar.
Graphical abstract
研究领域:
食品科学
·
分析化学
·
食品安全
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2016
·
IF 4.052
Shuang Zang,Sizhu Tian,Jia Jiang,Dandan Han,Xinyu Yu,Kun Wang,Dan Li,Dayong Lu,Aimin Yu,Ziwei Zhang
Twenty-one kinds of fruits including strawberry, mulberry, lemon, banana, etc. were measured for antioxidant capacity based on their ability to scavenge 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical. Vitamin C equivalent antioxidant capacity (VCEAC) was used to quantify antioxidant capacity of the studied fruits. The results were expressed as mg of ascorbic acid equivalent per 100 g fruit. Each fruit was divided into two parts: harvest part (fresh fruit analyzed immediately), and liquid nitrogen frozen part (fruit frozen and pulverized in liquid nitrogen). Antioxidant capacities of both fresh and frozen fruits were determined, and VCEAC values were proved to have no significant difference. For the frozen fruits, the antioxidant capacities were measured by electron spin resonance spectroscopy (ESR) and UV–vis spectrometry. VCEAC values obtained with UV–vis and ESR range from 11.48 to 345.75 mg/100 g and 7.01 to 366.26 mg/100 g. Experimental results indicated that VCEAC values obtained by two methods were highly correlated.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2018
·
IF 5.651
Chunhong Li,Hang Xiao,Xianfeng Wang,Tao Zhao
The energy consumption and environment pollution play an important role to the sustainable development in the dyeing and finishing industry. The aim of this study is to synthesize a series of acrylated epoxidized soybean oil based UV-curable polyurethane pigment adhesives and to reduce the consumption of energy and environment pollution in pigment printing process. The chemical composition was evaluated using fourier transform infrared spectra and nuclear magnetic resonance hydrogen spectroscopy. The thermal properties of UV-cured films were discussed by thermalgravimetric analysis (TGA) and differential scanning calorimetry (DSC). In addition, the effects of AESO content on particle size, water swelling properties and contact angles of the emulsions and films were investigated. Furthermore, the color yield, the rubbing fastness and washing fastness of the printed fabrics with acrylated epoxidized soybean oil based UV-curable polyurethane as adhesive were evaluated. The application of vegetable oil-based urethane acrylate pigments of cotton fabrics is a cleaner method that can reduce the consumption of energy and environment pollution. Compared to conventional thermally curable coatings, the UV-curable vegetable oil-based urethane acrylate pigment prints adhesive does not require a large amount of water and energy, indicating that vegetable oil-based urethane acrylate pigments have potential application in the cleaner production of textile industry .
研究领域:
纺织化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Huimei Pan,Baiyang Chen
Although UV and/or VUV tandem I – are often proposed as advanced reduction processes (ARPs) to eliminate micropollutants by generating e aq – , the fate of I – and its byproducts formation remain to be explored. Therefore, this study investigated the iodine species evolution during UV/I – and UV/VUV/I – processes under different influencing factors. Results show that UV/VUV oxidized most of I – to IO 3 – whereas UV only oxidized a portion of I – to intermediate reactive iodine species (RISs, including I 2 , HOI, and I 3 – ); meanwhile, substantial H 2 O 2 was generated only in UV/VUV/I – process but not in UV/I – process, proving that UV/VUV owns stronger oxidation ability than UV alone. Spiking I – into water exerted triple-sided effects by consuming •OH, generating e aq – , and shielding light, thus complicating the systems. Holistically, increasing pH or decreasing dissolved oxygen converted oxidizing environment into reducing condition and caused less RISs formation, especially for UV/VUV/I – . For oxyhalides , neither UV/I – nor UV/VUV/I – degraded ClO 4 – . While UV/I – cannot remove ClO 3 – , UV/VUV/I – reduced ClO 3 – to Cl – . Expectedly, both UV/I – and UV/VUV/I – reduced BrO 3 – to Br – more efficiently than UV and UV/VUV, confirming that I – can enhance the reduction capacities of UV/VUV and UV technologies .
研究领域:
环境科学
·
水处理
·
化学工程
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Dongcheng Yang,Chaoran Guo,Wei Gao,Likun Chen,Yongchao Zheng,He Zheng,Yan Cui,Yufeng Wu
Chemical warfare agents (CWAs) are highly toxic and prone to penetrate into and damage the coatings of various facilities, equipment, etc., which could also pose potential hazards to personnel. Developing protective coatings with good anti-penetration, transparency, and slipperiness properties remains a challenge. In this paper, a novel kind of coatings with both anti-penetration and liquid-like functions were prepared through the strategy of grafting fluorinated side chains as molecular brushes onto the cross-linking network. A fluorinated polysiloxane containing sulfhydryl groups was first synthesized and a series of polysiloxane coatings were prepared through UV-triggered thiol-ene click reaction employing different types of olefins crosslinkers. The coatings cured with trimethylcyclotrisiloxane and tetraallylsilane exhibited superior anti-penetration properties for simulants, due to their higher glass transition temperatures, increased crosslink density, smaller free volume and the lack of groups interacting strongly with simulants. These two coatings also exhibited liquid-like properties owing to the smooth surface and the presence of fluorine-containing segments, enabling the simulants slide down the tilted surface with almost no contaminated traces left on the coatings. The high transparency of the coatings would broaden the application prospects of these coatings. This article provides promising alternatives for polysiloxane-based protective coating materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Lijuan Huang,Xin Zhang,Zhuoyong Zhang
Many endogenous peptides are circulating in bodily fluids at micromole level, and accurate analysis of endogenous peptides at such low level is important. In this study, we presented an extensible, facile and sensitive sensor array based on UV–Vis spectroscopy of the AuNPs combined with chemometric methods for quantitative analysis of binary peptide mixture (Gly-Gly/Ala-Gln) using UV–Vis spectroscopy. High concentration arginine (Arg) and Cr 3+ can induce aggregation of the AuNPs and DNA-AuNPs. However, the glycylglycine (Gly-Gly) and alanyl-glutamine (Ala-Gln) can prevent the AuNPs from aggregation. We investigated the prevention of AuNPs aggregation by using Gly-Gly and Ala-Gln mixtures and constructed sensor arrays for quantitative analyses of Gly-Gly and Ala-Gln mixtures. The color change of the solution is relevant to the dose of the target, and it can be visualized by the naked eyes or monitored by UV–Vis spectrometry. Results showed that the concentrations of Arg and Cr 3+ are the key factors affecting the sensitivity of the sensor array. Whereas when Gly-Gly and Ala-Gln have to be analyzed simultaneously, concentrations of Arg and Cr 3+ both for Gly-Gly and Ala-Gln are difficult to be optimized. Taking the advantages of multivariate analysis and data fusion, PLS models and backward interval PLS (BiPLS) models were built for fused dataset constructed by UV–Vis data obtained at different concentrations of Arg and Cr 3+ . The best results were obtained from the PLS models. The proposed method can be extended to analysis of other peptides in more complex mixture systems.
研究领域:
分析化学
·
生物医学工程
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Bowen Dong,Yan Yuan,Jing Luo,Liming Dong,Ren Liu,Xiaoya Liu
Recently, acrylate epoxidized soybean oil (AESO) has become one of the most important industrial, bio-based, UV-curable resins. To reinforce AESO-based UV-curable coatings, acryloyl-group functionalized graphene ( acr -RGO) was successfully prepared and characterized using attenuated total reflection-Fourier transformed infrared spectroscopy, X-ray diffraction, Raman spectroscopy, and thermogravimetric analysis. The AESO/ acr -RGO nanocomposite coatings were fabricated using UV-curing technology to covalently introduce graphene sheets into the AESO matrix. Real-time infrared and ATR-FTIR spectroscopy were used to monitor double-bond conversions and deep curing in the AESO/ acr -RGO coating. Scanning electron microscope images revealed the homogeneous dispersion of acr -RGO in AESO. The thermal and mechanical properties of cured films were evaluated through thermogravimetric analysis, tensile testing, and dynamic mechanical analysis. The results revealed that the introduction of acr -RGO effectively enhanced the mechanical properties and the thermal stability of the host resin AESO. The optimal reinforcing effect was observed at 1.0 wt% acr -RGO loading, under which the tensile strength and storage modulus of the AESO/ acr -RGO nanocomposite improved by 167% and 15%, respectively, compared with those of neat AESO. The initial degradation temperature of the AESO/ acr -RGO nanocomposite was also sharply improved by 61 °C under a loading of 0.5 wt%. Additionally, a slight increase in the glass transition temperature of the AESO/ acr -RGO nanocomposite from 29.6 to 36.1 °C was observed when acr -RGO was incorporated. Furthermore, introducing acr -RGO enhanced the coating properties. By contrast, the composite coating using amino-group functionalized graphene (AESO/ ami -RGO) nanocomposites exhibited poorer mechanical properties and lower thermal stability than its acr -RGO counterpart. The remarkable property reinforcements are thus attributed to the acryloyl-group functionalization of graphene, which improved the compatibility and enhanced the interfacial adhesion of graphene with the AESO matrix.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2017
·
IF 0
Jieyu Zhang,Hongping Xu,Ling Hu,Yao Yang,Houbin Li,Chi Huang,Xinghai Liu
Novel waterborne UV-curable hyperbranched polyurethane acrylate/silica (HBWPUA/SiO2) nanocomposites were prepared by a three-step procedure and sol–gel method. 1H NMR and 13C NMR results indicate that HBWPU is successfully synthesized. Surface tension and contact angle tests both demonstrate the good wettability of the nanocomposites. Besides, the kinetics of photopolymerization of HBWPUA/SiO2 films were analyzed by attenuated total reflection-Fourier transform infrared spectroscopy, which reveals that the modified SiO2 could accelerate the curing speed of HBWPUA coatings. Thermal gravity analysis indicates that the HBWPUA/SiO2 hybrid films have a better thermal stability than the pure HBWPUA cured films. Furthermore, the hybrid films show enhanced pencil hardness, abrasion resistance, and adhesion. On the basis of the above, HBWPUA/SiO2 nanocomposites were finally applied to waterborne UV-curing flexographic printing ink, which is printed on poly(ethylene terephthalate) and glass. The nanocomposite presents good rheological behavior because the ink has a lower Z0, a higher Z∞, and the viscosity rebuild time is 375 s. Three colors (red, yellow, and blue) of ink were used to test its printing quality, the curing time was below 30 s, and the adhesion was excellent without being stripped. All of the inks show good water resistance and abrasion resistance. Moreover, the red and blue inks possess better solid densities than the value of 1.07 of yellow ink, and are 1.83 and 1.84, respectively. The current study suggests that the process has promise in applications of food packages.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Qing Wang,Guangxue Chen,Yanyan Cui,Junfei Tian,Minghui He,Jian-Wen Yang
In this paper, we reported castor oil based biothiol (CO-SH) as a highly stable and self-initiated oligomer for photoinitiator (PI)-free UV coating. CO-SH was synthesized via esterification reaction between castor oil (CO) and 3-mercaptopropionic acid (MPA). The results of both proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared spectroscopy (FTIR) revealed that the targeted oligomer was successfully prepared. The oligomer with the number-average molecular weight of 2040 g mol–1 exhibited a narrow molecular weight distribution (PDI = 1.23). CO-SH could be stored at 80 °C for 7 days with only a light C═C conversion (≈6%); hence, the steric effect of the vegetable oil molecule gave the primary biothiol an excellent temporal stability. Furthermore, real-time FTIR results indicated that excellent photopolymerization profiles were obtained, and the final conversions of double bond and thiol were 100% and 77% in the absence of PI, respectively, showing the rapid self-initiated photoactivity. In addition, the self-initiated photopolymerization mechanism of CO-SH was investigated. Finally, the UV-curable films of CO-SH also showed good physical and chemical properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Zhuangzhuang Chu,Yechang Feng,Bingqing Xie,Yu Yang,Yang Hu,Xiaohua Zhou,Teng Yuan,Zhuohong Yang
Materials with high bio-content have gradually replaced petroleum-based materials due to their sustainability, low cost, low toxicity and excellent performance in the field of UV-LED curable coatings. A novel tung oil-based methacrylate (TDMM) with low viscosity and multiple photopolymerizable methacrylates was designed and synthesized through three steps containing amidation, thiol-ene click reaction and esterification. The reaction conditions for thiol-ene click reaction were optimized by calculating double bond conversion and degree of functionalization of polyols. The chemical structures of the as-prepared TDMM were characterized by 1 H NMR and FTIR. The rheological behavior analysis indicated that TDMM exhibited lower viscosity than petrochemical-based reactive diluent pentaerythritol triacrylate (PETA). Subsequently, TDMM showed good copolymerization ability with soybean oil-based reactive monomer (AESO) under the “green + green” UV-LED curable systems with high bio-content (61–81% in theory). The TDMM/AESO systems showed higher T g but lower thermal stability, better modulus and tensile strength than the neat AESO. Besides, the UV-LED cured coatings exhibited excellent physical and chemical properties. This bio-renewable tung oil-based monomer is shown to be an effective reactive diluent and considered to have good potential in the development of the UV-LED curable coatings.
研究领域:
材料科学
·
绿色化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Xiaowen Li,Zhu Liu,Peng Hong,Lijuan Chen,Xiaoxuan Liu
The combination of organic and inorganic components has become an challenging for the generation of new materials with preeminent properties over pure constituents. In the present work, a novel hybrid photoinitiator for free radical photopolymerization, belonging to the thioxanthone derivatives, was obtained via chemical joint between silica and 2-chlorothioxanthone (CTX) under a mild preparation condition. This multifunctional supported photoinitiator (silica-s-CTX) can not only initiate the photopolymerization with higher efficiency than traditional photoinitiator CTX, but also prominently improve the dispersion of nanoparticles in the epoxy acrylates resin which brings to the preeminent mechanical properties of UV-cured coatings. Importantly, the amount of residual-free PIs in silica-s-CTX curing system shows a significant decrease comparing with the filled and unfilled CTX curing system. After endowing the silica nanoparticles with photo-initiated performance, it may offer new scientific and technological opportunities for the preparation of high performance UV-curing coatings.
研究领域:
材料科学
·
光化学
·
表面与界面科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）