CEREAL CHEMISTRY
·
2023
·Vol. 100
·期 5
·1106-1113
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IF 2.4
Yuhang Wan,Xinyu Yuan,Jia Liu,Ding Zhang,Zhengyong Zhang,Min Sha
Background and Objectives Targeting the problems, like various residual pesticides, the high interference of sample matrix and the slow detection speed, this work studied the rapid screening method of multipesticide residues in rice by taking bensulfuron-methyl, propanil and cypermethrin as examples. Findings Rice matrix solution was obtained by using the improved QuEChERS method, matrix standard solution, and solvent standard solution were prepared to obtain the linear range and matrix effect of each pesticide. QuEChERS method could rapidly pretreat samples, and the matrix effect was soft, with matrix effect values lower than 16%. Mixed solutions of the three pesticides in four combinations were prepared within the linear range. The type of pesticides in rice was determined by support vector machine (SVM), and the pesticide concentration was predicted by partial least square regression (PLSR). SVM provided a supervised identification method for pesticide residues, making the recognition accuracy higher than 90%. The error of PLSR in predicting pesticide concentration was lower than 5.36%. Conclusions UV spectroscopy had fast test speed, so the combination of QuEChERS and UV spectroscopy could improve the efficiency of analysis. SVM combined with PLSR could preliminarily determine the type of pesticides in rice sample, and then accurately predict the concentration of pesticides. Significance and Novelty The QuEChERS sample pretreatment technology and UV spectroscopy in combination with chemometrics was expected to be a new technology for rapid detection of pesticide residues in samples.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Panduo Shan,Jiayi Lin,Yanbo Zhai,Shuai Dong,Zuo Tong How,Rui Qin
Diethylamino hydroxybenzoyl hexyl benzoate (DHHB), an ultraviolet (UV) filter, can be found in sunscreens and other personal care products and thus can be introduced into swimming pools through the swimmers. In outdoor pools, DHHB will inevitably interact with free chlorine and sunlight. Therefore, the mechanism of solar‑chlorine chemical transformation of DHHB, as well as the environmental risk, were investigated in this work. In chlorinated with solar (Cl + solar) process, free chlorine was the dominant contributor to 85% of the DHHB degradation, while hydroxyl radicals and reactive chlorine species contributed only 15% because of low free radical generation and fast DHHB and free chlorine reaction rates. Scavenging matrices, such as Cl − , NH 4 + , and dissolved organic matter (DOM), inhibited the degradation of DHHB in the Cl + solar process, while Br − , HCO 3 – , NO 3 – , and urea promoted DHHB degradation. DHHB degradation was inhibited in tap water swimming pool samples, while it was enhanced in seawater pool samples by the Cl + solar process. Seven transformation by-products (TBPs) including mono-, dichlorinated, dealkylate, and monochloro-hydroxylated TBPs were identified. Three degradation pathways, chlorine substitution, chlorine and hydroxyl substitution, and dealkylation were proposed for DHHB transformation in the Cl + solar process. Both Quantitative structure-activity relationship and Aliivibrio fischeri toxicity tests demonstrated increased toxicity for the chlorinated TBPs. A risk assessment of the DHHB and its TBPs suggested that both DHHB and its chlorinated TBPs pose a significant health risk.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zeying Liu,Zixuan Chen,Huaxia Xie,Yali Cui,Hong-Jian Feng,Kai Hua
The antibacterial effect induced by photocatalysis of UV-irradiated TiO 2 has been widely studied. The present work reveals that Ag + implanted TiO 2 film shows significantly enhanced antibacterial activity without the application of UV light. Density functional calculations show that the existence of the implanted Ag + tends to change the electric field leading to a gradient band alignment of TiO 2 near the interface, favoring the charge transfer from the TiO 2 side to the membrane of the bacteria. Our density functional calculations clearly demonstrate the strong evidence of charge transfer channeling from the conduction band of Ag + implanted TiO 2 to the bacteria membrane which produces large amount of reactive oxygen species (ROS, including O 2 •– , H 2 O 2 and •OH). The ROS lead to bacteria death by inducing physiological changes such as membrane break, leakage of intracellular components, protein denaturation and DNA lesions. This work unravels the antibacterial mechanism of Ag + implanted TiO 2 , and contributes furtherly to the rational design and modification of biomaterials by Ag + implantation.
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2023
·
IF 5.8
Mingsheng Liu,Wenwen Yu,Yu Fang,Haichun Zhou,Yu Liang,Congshu Huang,Hongbin Liu,Guanghui Zhao
Solar skin damage is one of the most common diseases among outdoor workers. An important cause for the damage is the ultraviolet and infrared rays in sunlight, which are absorbed by the skin in large amounts, leading to severe skin inflammation and oxidative stress. Therefore, physical prevention by shielding the light from harmful wavelengths can be an effective method of skin protection from radiation. However, for existing skin lesions, prompt treatment is essential to avoid the aggravation of the injury and promote repair. Therefore, to improve the therapeutic effect on sun-damaged skin, we attempted to design a system with a dual purpose of eliminating toxic free radicals and modulating tissue inflammatory response. Here, we designed and synthesized a poly-acryloyl lysine (P-Ac-Lys) and polyvinyl alcohol-dihydroxyphenylalanine (PVA-DOPA) composite hydrogel ( [email protected] Hydrogel) loaded with lactate and pyruvate, that exhibites a good free radical scavenging activity and an excellent ability to modulate the inflammatory response. Experimental results showe that this hydrogel film could effectively reduce the UV-induced skin inflammation response, alleviate pathological damage and promote the recovery of the damaged skin.
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Gels
·
2022
·Vol. 9
·期 1
·10
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IF 4.432
Yanjin Tang,Yuhan Lai,Ruiqin Gao,Yuxuan Chen,Kexin Xiong,Juan Ye,Qi Zheng,Zhenxing Fang,Guangsheng Pang,Hoo-Jeong Lee
Functional aerogels composed of regenerated cellulose and tungsten oxide were fabricated by implanting tungsten-oxide nanodots into regenerated cellulose fiber. This superfast photochromic property benefitted from the small size and even distribution of tungsten oxide, which was caused by the confinement effect of the regenerated cellulose fiber. The composite was characterized using XRD and TEM to illustrate the successful loading of tungsten oxide. The composite turned from pale white to bright blue under ambient solar irradiation in five seconds. The evidence of solar absorption and electron paramagnetic resonance (EPR) demonstrated the fast photochromic nature of the composite and its mechanism. Furthermore, carbon fiber filled with preferential growth tungsten-oxide nanorods was obtained by annealing the photochromic composite in a N2atmosphere. This annealed product exhibited good absorption across the whole solar spectrum and revealed an excellent photothermal conversion performance. The water evaporation rate reached 1.75 kg m−2h−1under one sun illumination, which is 4.4 times higher than that of pure water. The photothermal conversion efficiency was 85%, which shows its potential application prospects in seawater desalination.Keywords:functional aerogels;regenerated cellulose;color center;solar absorbent;desalination
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 7
·2200884
·
IF 4.6
Xiaohua Cui,Jiaming Liu,Ending Zhang,Ziyang Gong,Liyan Liang,Jun Shi,Xiaopeng Hao,Jiwen Hu,Mangeng Lu
Thermally conductive pressure-sensitive adhesive (PSA) has received a great amount of attention in recent years, but the traditional PSA hardly loses adhesion properties after UV irradiation or heating. Therefore, endowing thermally conductive adhesive with UV-responsive peelability becomes a design strategy. Herein, vinyl-functionalized graphene (AA-GMA-G) is prepared by modifying graphene with acrylic acid and subsequently reacting with glycidyl methacrylate. Then, the UV-curable acrylate copolymer is synthesized by grafting glycidyl methacrylate. Finally, the novel thermally conductivity PSA with UV-responsive peelability is obtained by blending the copolymer with AA-GMA-G and photoinitiator. The results show that the PSA at 2 wt% AA-GMA-G loading exhibits an excellent thermal conductivity (0.74 W m −1 K −1 ) and a relatively strong peel strength, increasing by 15% compared with pristine graphene/PSA. Interestingly, the peel strength of AA-GMA-G/PSA can achieve a dramatic drop after UV treatment, and the decrease rate is 96.7%. Therefore, the novel thermally conductive PSA with UV-responsive peelability has potential applications in certain electronic devices.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaoshan Dong,Xiaochao Zhu,Fawei Lin,Beibei Yan,Jian Li,Guanyi Chen
Tar formation during biomass gasification reduces energy efficiency and poses a negative impact on downstream applications. A photothermal steam reforming (PTR) system based on LaMn x Ni 1-x O 3 (0 ≤ x ≤ 1) perovskite was developed to convert tar into combustible gas. The effects of Mn substitution, temperature, and the steam to carbon ratio on PTR activity were investigated. Mn substitution increased the content of surface adsorbed oxygen and maintained the perovskite structure of LaMn 0.4 Ni 0.6 O 3 (LM4N6). Moreover, LM4N6 showed improved optical absorption and electron-hole separation properties. LM4N6 presented 90 % carbon conversion during PTR at 400 °C. Due to the introduction of ultraviolet–visible light (UV–vis), LM4N6 obtained better catalytic activity and stability in PTR than in the thermal catalytic reforming process. Detailed characterization and experiments proved that UV–vis effectively activated Ni sites and the oxygen species on LM4N6 and formed a photothermal synergistic effect, which inhibited carbon deposition and improved catalytic activity and stability. This work provides a novel concept for the conversion and utilization of biomass tar at low temperatures.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Shuai Zhang,Kuanjun Fang,Xiuming Liu,Xiran Qiao,Jinkun Wang
In order to satisfy the demand for more textile taking properties, UV resistance and hydrophobic functionalization have become the focus of research in the field of textile modification. We herein report a simple method to prepare hydrophobic and UV-resistant multifunctional colored cotton fabrics by the self-curing technique of cationic polyethyleneimine dye polymer (CPNP(R218)) nanospheres. First, cationic CPNP(R218) nanospheres with homogeneous particle size and good dispersion stability were synthesized, which can be directly introduced to the eco-friendly cotton fiber dyeing. Polymer membranes on the surface of cotton were formulated through self-curing of the CPNP(R218) nanospheres during the dyeing process, and its surface morphology and elements were characterized. The cotton fabric dyed CPNP(R218) nanospheres have good color properties along with good hydrophobicity , showing a static water contact angle (WCA) of 138.4°. In addition, the ultraviolet protection factor (UPF) value of the dyed cotton was 3.5 times higher than the original cotton fabric, due to the polymer film blocking the penetration of UV radiation. Therefore, the method of self-curing film formation by dye polymer nanospheres has great significance for the construction of multifunctional colored cotton fabrics.
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Colloid and Interface Science Communications
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2023
·
IF 4.5
Ye Yang,Xiaohang Lin,Shuai Liu,Chengtao Gao,Fuping Dong,Yuzhu Xiong
Polysilsesquioxane (PSQ) hollow spheres show great potential in various fields, including catalysts, environmental protection, and drug delivery, owing to their high stability, large interior cavity, and adjustable surface chemistry. However, the fabrication of amino-functionalized PSQ hollow spheres (AHPSQ) with inherent amine groups on the surface still remains a challenge partly due to the hydrophilicity of the silane precursor. In this study, for the first time AHPSQ was fabricated via a facile sol-gel process utilizing aminopropyltrimethoxysilane and methyltrimethoxysilane as co-precursor in an ice bath. The pH-sensitive release behavior of AHPSQ was demonstrated using avermectin as a pesticide model and the release kinetics were analyzed. The artificial ultraviolet accelerated experiment confirmed that the carrier has an ultraviolet protective effect on the pesticide and can reduce the ultraviolet degradation rate.
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JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 9
·5964-5974
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IF 2.1
Zhou Xuebin,Ying Zhihua,He Xingxin,Zhang Chenhan,Zheng Xiaolong,Zheng Peng
Cellulose nanofiber (CNF), a natural polymer material with a high specific surface area, is a potential candidate for gas sensors. Here, we report Au/SnO 2 composites with excellent performance synthesized by a chemical precipitation method based on CNF-assisted synthesis, and a series of Au/SnO 2 composites were prepared by adjusting the Au content. The sensitivity of the 1.5 wt.% Au/SnO 2 sensor to a low concentration of 1 ppm NO 2 was 53, nearly 17 times higher than that of pure SnO 2 synthesized by CNF, under ultraviolet (UV) irradiation at a wavelength of 365 nm. The crystal structure of the composite was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), revealing that the composites had high crystallinity and particles reaching the nanoscale. Further experimental data showed that the CNF-assisted synthesis Au/SnO 2 sensors had good selectivity, repeatability, and stability. Additionally, the sensor is able to maintain its excellent gas sensing performance even under varying humidity conditions.
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Materials Today Physics
·
2023
·
IF 11.5
Jinming Wan,Jun Xu,Shiyun Zhu,Jun Li,Kefu Chen
Design and preparation of photochromic materials with reversible color change under specific wavelength irradiation have been active research fields. However, these existing materials face a great challenge in rapid responsiveness and effective water management. Here, a waterproof composite with fast light response was successfully prepared by air-jet electrospinning and subsequent spray treatment. Specifically, its response time and saturation time are reduced to a few seconds and 1 min, respectively. Its reflectivity at 670 nm changes from 77.50% to 6.26%, which strongly indicates the large color contrast of this composite. Its natural fading process only takes 1 h, and infrared radiation can further reduce the erasure process to a few seconds. Concurrently, this material possesses hydrophobic properties and anti-adhesion performance, providing superior protection for its photochromism. Overall, this waterproof composite possesses rapid photochromism and appropriate spontaneous fading efficiency, enabling it to have a very broad application prospect in the fields of indicator materials, anti-counterfeiting materials, personalized labels, etc.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Zhizhuo Chai,Jingquan Wang,Yixue Dai,Erdeng Du,Hongguang Guo
Methylisothiazolinone (MIT) is widely used in daily chemicals, fungicides , and other fields and its toxicity has posed a threat to water system and human health. In this study, ultraviolet (UV)/trichloroisocyanuric acid (TCCA), which belongs to advanced oxidation processes (AOP), was adopted to degrade MIT. Total chlorine attenuation detection proved that TCCA has medium UV absorption and a strong quantum yield (0.49 mol E −1 ). At a pH of 7.0, 93.5% of MIT had been decontaminated after 60 min in UV/TCCA system (k obs = 4.4 × 10 −2 min −1 , R 2 = 0.978), which was much higher than that in the UV alone system and TCCA alone system, at 65% (1.7 × 10 −2 min −1 , R 2 = 0.995) and 10% (1.8 × 10 −3 s −1 , R 2 = 0.915), respectively. This system also behaved well in degrading other five kinds of contaminants. Tert-butanol (TBA) and carbonate (CO 3 2− ) were separately used in quenching experiments, and the degradation efficiency of MIT decreased by 39.5% and 46.5% respectively, which confirmed that HO• and reactive chlorine species (RCS) were dominant oxidants in UV/TCCA system. With TCCA dosage increasing in a relatively low concentration range (0.02–0.2 mM) and pH decreasing, the effectiveness of this AOP system would be strengthened. The influences of coexisting substances (Cl − , SO 4 2− , CO 3 2− , NO 2 − and NO 3 − ) were explored. MIT degradation pathways were proposed and sulfur atom oxidation and carboxylation were considered as the dominant removal mechanisms of MIT. Frontier orbital theory and Fukui indexes of MIT were employed to further explore the degradation mechanism.
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