Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 4
·979-988
·
IF 5.693
Liang Chaobo,Du Yuzhang,Wang Yiyang,Ma Aijie,Huang Shan,Ma Zhonglei
Wood is widely used in the field of construction, decoration, and electronics, but its inherent flammability has serious fire hazards. As one of the fire-retardant treatment methods of wood, fire-resistant coatings have greatly reduced and prevented the occurrence of fires in the field of combustible materials. In this work, using melamine polyphosphate (MPP) as intumescent flame retardant, graphite nanoplates (GNPs) as synergistic flame retardant/conductive filler, and acrylic resin as film forming agent, GNPs/MPP/acrylic coatings with outstanding flame retardancy, excellent heat resistance, and ideal electromagnetic interference (EMI) shielding were prepared by a simple physical blending method. The results showed that GNPs and MPP significantly improved the flame retardancy, heat resistance, and EMI shielding of acrylic coatings. By adding 20 wt% of GNPs and 20 wt% of MPP, the limiting oxygen index (LOI) value, heat resistance index ( T HRI ), and EMI shielding effectiveness (SE) of GNPs/MPP/acrylic coating at the thickness of 40 μm reach 30% and 189.1 °C and 15 dB, respectively, which are better than those of pure acrylic coating (19%, 181.0 °C, and 0.1 dB). This intumescent fire-retardant coating with excellent flame retardancy, good heat resistance, and ideal EMI shielding performances has broad application prospects in the fields of construction, decoration, and electronics. Graphical abstract Fire-retardant mechanism and combustion diagram of GNPs/MPP/acrylic resin coated wood
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 2
·1-9
·
IF 5.833
Li Wenjun,Chen Siyu,Yang Yue,Song Yiju,Ma Chaoyun,Qiao Xiuwen,Hong Chenglin
A GOx/HRP@ZIF-90 nanomaterial is proposed by coating GOx and HRP in ZIF-90 using a bio-simulated mineralization method to improve the tolerance of the enzyme to the external environment. In the detection process, the ZIF-90 is turned on under mild conditions by the competitive reaction of ATP with Zn 2+ and imidazole-2-carboxaldehyde (2-ICA), and the electrical signal of the system is amplified by the enzyme cascade reaction of GOx and HRP. Finally, based on the signal amplification strategy of the competitive reaction between Zn 2+ and ATP to construct a “signal on” mode, electrochemical immunosensor of GOx-HRP enzyme–linked cascade reaction was prepared. The proposed electrochemical immunosensor shows an excellent analytical performance when detecting CA-125, with good selectivity and stability, with a detection range of 0.1 pg mL −1 –40 ng mL −1 and a detection limit of 0.05 pg mL −1 . The test has been performed using chronoamperometry under a constant voltage of −0.4 V. The immunosensor also shows an excellent performance when analysing human blood samples. The recovery of the immunosensor is 97.94–101.8%, with a relative standard deviation of 3.7–6.1%. The proposed sensor provides a novel idea for clinical use of GOx and HRP enzymes and a new method for the clinical detection of tumor markers. Graphical abstract
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 21
·26913-26922
·
IF 4.223
Yang Kaiyan,Sun Zhiyi,Wang Luochun,Lou Ziyang
To utilize carbon source and decompose the petroleum hydrocarbon substances simultaneously, adding the electrolysis to ozonation (E + -Ozonation) was employed to deal with hazardous activated petroleum waste sludge (P-sludge). It was found that E + -Ozonation could accelerate the ozone utilization and hydroxyl radical (·OH) generation rate. Soluble chemical oxygen demand (SCOD) increased around 16.3 times than the control one (from 471 to 7700 mg/L). The potential carbon source, such as the short-chain carbon of acetate and propionate, increased from 50 to 1088 mg/L and from 27 to 614 mg/L respectively, and approximately accounted for a quarter of total SCOD. Total petroleum hydrocarbon (TPH) decomposition was observed with a much higher removal rate of 84.3% simultaneously, and the substances with the function group of C=C and C–C bonds decomposed greatly. The long- and medium-chain substances in TPH were converted into the short-chain substances (90% of C 28 –C 40 of hydrocarbons was removed, while C 10 –C 18 increased by 13.8%). E + -Ozonation process could be one of the promising methods for P-sludge decomposition through carbon source releasing and TPH removal. Graphical abstract
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 32
·44111-44123
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IF 4.223
Ye Chunmeng,Shi Jiaqi,Zhang Xuesheng,Qin Li,Jiang Zhongguan,Wang Jinhua,Li Yucheng,Liu Bingxiang
As a class of synthetic sulfur drugs, sulfonamides (SAs) have been used to treat diseases and promote organism growth. Different concentrations of SAs have been detected in the water environment, which has threatened the ecological environment. In this study, the contamination of 9 SAs in water, sediments, and 8 fish species from the Hangbu-Fengle River, China, were analyzed using UPLC-MS/MS. The total SA concentrations in surface water, sediments, and fish were ND-5.064 ng/L, ND-5.052 ng/g dry weight (d.w.), and ND-1.42 ng/g wet weight (w.w.), respectively. The major compounds were sulfadiazine (SDZ), sulfamerazine (SMZ), and sulfamethoxazole (SMX) in water and fish. The SA levels of in fish from different habitat preferences revealed a spatial difference, with the order of demersal species > pelagic species. Moreover, the SA concentrations were affected by trophic guilds, indicating their decrease in the order of piscivorous fish > omnivorous fish > planktivorous fish > herbivorous fish. The obtained bioaccumulation factors showed that SMZ and SMX have strong bioenrichments in Ophiocephalus argus Cantor and Pelteobagrus fulvidraco . The risk assessment indicated that SAs did not pose significant health threats to the organisms. This research is the first report of SA contamination in the Hangbu-Fenle River, which can provide an important scientific basis for their pollution prevention and ecological risk assessment in the aquatic environment.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 14
·3683-3693
·
IF 4.157
Zhang Lili,Zhang Ziyu,Tian Yu,Cui Meihui,Huang Beibei,Luo Tao,Zhang Shufang,Wang Hanjie
How to achieve simultaneous and rapid detection of various mycotoxins in food has important practical significance in the field of food processing and safety. In this paper, a smartphone immunoassay system based on hydrogel microspheres has been constructed to quickly detect two mycotoxins at the same time. The rapid detection system was reflected in the following three processes: (1) rapid separation of free matter after direct competition reaction based on hydrogel solid-phase carrier particles; (2) rapid detection process based on efficient catalytic function of enzymes; (3) fast capture and analysis of images based on smartphone software. Ochratoxin A (OTA) and zearalenone (ZEN) are secondary toxic metabolites of fungi that can contaminate a wide range of foods and feeds. OTA and ZEN were used as detection model molecules to verify the feasibility of the intelligent rapid detection system. The entire detection process was within 30 min, and the results were analyzed in only 10 s. Detection limits of mycotoxins OTA and ZEN are 0.7711 ng L −1 and 1.0391 ng L −1 . The recoveries of both mycotoxins ranged from 76.72 to 122.05%. This study provides a universal rapid detection method for on-site application of large-scale food security testing. Graphical abstract
Schematic diagram of the construction of the smartphone detection system: The system is divided into three parts: detection, image capture and analysis, and result.
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高影响因子
PHARMACEUTICAL RESEARCH
·
2021
·Vol. 38
·期 4
·669-680
·
IF 4.2
Wang Yeying,Li Qilong,Zhou Jing-e,Tan Jingwen,Li Minghao,Xu Nan,Qu Feng,Chen Jian,Li Ji,Wang Jing,Liang Zhiqiang,Yu Lei,Wang Yiting,Yan Zhiqiang
Purpose To address the issue of local drug delivery in tumor treatment, a novel nanoparticle-hydrogel superstructure, namely semi-interpenetrating polymer networks (semi-IPNs) hydrogel composed of poly (ethylene glycol) diacrylate (PEGDA) and hyaluronic acid (HA) and incorporated with paclitaxel (PTX) loaded PLGA nanoparticles (PEGDA-HA/PLGA-PTX), was prepared by in situ UV photopolymerization for the use of local drug delivery. Methods Using the gelation time, swelling rate and degradation rate as indicators, the optimal proportion of Irgacure 2959 initiator and the concentration of HA was screened and obtained for preparing hydrogels. Next, paclitaxel (PTX) loaded PLGA nanoparticles (PLGA-PTX NPs) were prepared by the emulsion solvent evaporation method. Results The mass ratio of the initiator was 1%, and the best concentration of HA was 5 mg/mL in PEGDA-HA hydrogel. In vitro experiments showed that PLGA-PTX NPs had similar cytotoxicity to free PTX, and the cell uptake ratio on NCI-H460 cells was up to 96% by laser confocal microscopy and flow cytometry. The drug release of the PEGDA-HA/PLGA-PTX hydrogel local drug delivery system could last for 13 days. In vivo experiments proved that PEGDAHA/PLGA-PTX hydrogel could effectively inhibit the tumor growth without causing toxic effects in mice. Conclusions This study demonstrated that the PEGDA-HA/PLGA-PTX hydrogel is a promising local drug delivery system in future clinical applications for tumor therapy. Graphical abstract
A photopolymerized semi-interpenetrating polymer networks-based hydrogel incorporated with paclitaxel-loaded nanoparticles was fabricated by in situ UV photopolymerization, providing a promised nanoplatform for local chemotherapy of tumors.
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Biomass Conversion and Biorefinery
·
2021
·Vol. 13
·期 14
·12581-12590
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IF 4.987
Liu Ruixia,Ding Tingting,Deng Pingping,Yan Xiaofan,Xiong Fuquan,Chen Jienan,Wu Zhiping
In order to improve the reaction activity of lignin and increase its utilization rate. Lignin extracted from poplar wood powder by deep eutectic solvent was degraded with hydrogen peroxide (H 2 O 2 ) and sodium hydroxide (NaOH) to obtain degraded deep eutectic solvent lignin (DES-lignin). The structures of DES-lignin and degraded DES-lignin were characterized by gel permeation chromatography (GPC), elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), two-dimensional nuclear magnetic resonance spectroscopy (2D-HSQC NMR), and thermogravimetric analysis (TGA). The results indicated that the phenolic hydroxyl group of degraded DES-lignin increased by 39.62% and M w and M n decreased by 49.12% and 47.83%, respectively. C content decreased by 1.13%. The relative strength and S/G increased by 25.76% and 13.5%, respectively. The polymerization degree, β-O-4 linkages, and β-β linkages were decreased by 10.82%, 4.8%, and 4.2%, respectively. The residual residue increased by 8.3% at 800 °C. It showed that degraded DES-lignin had the advantages of strong activity, more reaction sites, narrow molecular weight distribution, less condensation structure, and thermal stability, which was more conducive to the high-value utilization of lignin.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2021
·Vol. 194
·期 3
·1290-1302
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IF 2.926
Ji Yingrui,Xu Long,Xu Qingqing,Liu Xuan,Lin Sen,Liao Sentai,Wang Weifei,Lan Dongming
More and more industries demand environmental friendliness. Silkworm pupae oil (SPO), extracted from the desilked silkworm pupae, can serve as a promising substrate alternative to use in plasticization. This study aimed to prepare epoxidized silkworm pupae oil (ESPO) and investigate their effects on the thermal stability and plasticization of polyvinyl chloride (PVC) films. A chemo-enzymatic method of ESPO was developed in the presence of Lipase SMG1-F278N and H 2 O 2 in natural deep eutectic solvents (DESs). Lipase SMG1-F278N could initiate the epoxidation reaction effectively at room temperature with a negligible loss of activities 10 batches. A maximum oxirane value of 6.94% was obtained. The formation of oxirane ring in ESPO was confirmed by FTIR and 13 C NMR spectra. Moreover, ESPO showed a better thermal stability and lower freezing point than epoxidized soybean oil (ESO). It was demonstrated that ESPO had a good frost resistance. In addition, ESPO showed a significantly improved plasticizing effect on flexible polyvinyl chloride (PVC). Compared with ESO, ESPO could increase the tensile elongation at break effectively. A significantly lower migration rate of plasticizer was observed in PVC plasticized with ESPO.
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Nano Research
·
2021
·Vol. 15
·期 3
·1949-1958
·
IF 8.897
Zhao Chen,Guo Shien,Li Qi,Liu Jianan,Zheng Mang,Xiao Xudong,Jiang Baojiang,Fu Honggang
Fenton or photocatalytic degradations of organic contaminants are recognized as promising approaches to address the increasing environmental pollution issues. Herein, we develop the effective synergistic catalysis reaction of Fenton and photocatalysis based on a loofah sponge-like Fe 2 O x /C nanocomposite, which exhibits excellent nitrobenzene photocatalytic degradation property. It is noted that Fe 2 O 3 nanoparticles with surface Fe 2+ species were encapsulated with an ultrathin carbon layer (denoted as Fe 2 O x /C) via a supramolecular self-sacrificing template and following thermal treatment process. The experimental results indicated that the thin layer carbon coating not only inhibited the Fe iron leaching from the Fe 2 O x but also prompted the separation and transferring of electrons-hole pairs. The introduction of Fe 2 O x /C enables the Fenton reaction to induce a rapid Fe 2+ /Fe 3+ cycle, and meanwhile, together with the photocatalytic reaction to produce continuous active substances for the subsequent degradation catalytic reaction without successive H 2 O 2 , resulting in the inexpensive and the effective photocatalytic procedure. As a result, 100% nitrobenzene (100 mg/L) was degraded and 97% of the organic carbon was mineralized in 90 min using the Fe 2 O x /C (0.1 g/L) at a low H 2 O 2 dosage (0.50 mM), under air mass (AM) 1.5 irradiation. Theoretical calculations confirmed that the Fe 2 O x /C-600 with thin carbon layer promoted the dissociation of H 2 O 2 and the ·OH desorption. The synergistic catalysis of this work may provide new ideas for low-cost and more efficient treatment of pollutants.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 9
·13478-13490
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IF 4.223
Kang Lian,Chen Jiadong,Wang Junke,Zhao Tianxin,Wei Yuexin,Wu Yuhao,Han Lindong,Zheng Xiangqin,Shen Lianju,Long Chunlan,Wei Guanghui,Wu Shengde
The toxic effect of di(2-ethylhexyl) phthalate (DEHP) on prepubertal testes was examined in this study. We treated 3-week-old male mice with 4.8 mg/kg/day (milligram/kilogram/day) (no observed adverse effect level), 30 mg/kg/day (high exposure dose relative to humans), 100 mg/kg/day (level causing a reproductive system disorder), and 500 mg/kg/day (dose causing a multigenerational reproductive system disorder) of DEHP via gavage. Obvious abnormalities in the testicular organ coefficient, spermatogenic epithelium, and testosterone levels occurred in the 500 mg/kg DEHP group. Ribonucleic acid sequencing (RNA-seq) showed that differentially expressed genes (DEGs) in each group could enrich reproduction and reproductive process terms according to the gene ontology (GO) results, and coenrichment of metabolism pathway was observed by the Reactome pathway analysis. Through the analysis of common genes in the metabolism pathway, we discovered that DEHP exposure at 4.8 to 500 mg/kg or 100 mg/kg caused the same damages to the prepubertal testis. In general, we identified two key transcriptional biomarkers (fatty acid binding protein 3 (Fabp3) and carboxylesterase (Ces) 1d), which provided new insight into the gene regulatory mechanism associated with DEHP exposure and will contribute to the prediction and diagnosis of prepuberty testis injury caused by DEHP.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 8
·994-1003
·
IF 3.603
Zhang Wan-Bin,Luo Jie,Wang Yan-Meng,Zhu Xiu-Zhong,Zhang Ce,Liu Jing,Ni Mei-Le,Zhang Guang-Hua
A series of hydroxyl-terminated polyethylenes (HTPE) bearing various functional side groups ( e.g. carboxyl, ester and butane groups) were synthesized by the combination of ring-opening metathesis polymerization (ROMP) and visible light photocatalytic thiol-ene reaction. The products are named as α, ω -dihydroxyl-poly[(propionyloxythio)methinetrimethylene] (HTPE carboxyl ), α, ω -dihydroxyl-poly[(methylpropionatethio) methinetrimethylene] (HTPE ester ) and α, ω -dihydroxyl-poly[(butylthio) methinetrimethylene] (HTPE butane ), respectively. The investigation of ROMP indicated that the molecular weight of resultant hydroxyl-terminated polybutadiene (HTPB) can be tailored by varying the feed ratios of monomer to chain transfer agent (CTA). The exploration of the photocatalytic thiol-ene reaction between HTPB precursor and methyl 3-mercaptopropionate revealed that blue light as well as oxygen accelerated the reaction. 1 H-NMR and 13 C-NMR results verified all the double bonds in HTPB can be modified, and the main chain of resultant polymer can be considered as polyethylene. Subsequently, relationship between the structure of side groups and the thermal properties of functional PEs was studied. And the results suggested that the T g was in the order of HTPE butane
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 12
·1528-1537
·
IF 3.603
Song Guang-Xing,Miao Teng-Fei,Cheng Xiao-Xiao,Ma Hao-Tian,He Zi-Xiang,Zhang Wei,Zhang Zheng-Biao,Zhu Xiu-Lin
In this contribution, we utilized surface-initiated atom transfer radical polymerization (SI-ATRP) to prepare organic-inorganic hybrid core/shell silica nanoparticles (NPs), where silica particles acted as cores and polymeric shells (PAzoMA*) were attached to silica particles via covalent bond. Subsequently, chiroptical switch was successfully constructed on silica NPs surface taking advantage of supramolecular chiral self-assembly of the grafted side-chain Azo-containing polymer (PAzoMA*). We found that the supramolecular chirality was highly dependent on the molecular weight of grafted PAzoMA*. Meanwhile, the supramolecular chirality could be regulated using 365 nm UV light irradiation and heating-cooling treatment, and a reversible supramolecular chiroptical switch could be repeated for over five cycles on silica NPs surface. Moreover, when heated above the glass transition temperature ( T g ) of PAzoMA*, the organic-inorganic hybrid nanoparticles (SiO 2 @PAzoMA* NPs) still exhibited intense DRCD signals. Interestingly, the supramolecular chirality could be retained in solid film for more than 3 months. To conclude, we have prepared an organic-inorganic hybrid core/shell chiral silica nanomaterial with dynamic reversible chirality, thermal stability and chiral storage functions, providing potential applications in dynamic asymmetric catalysis, chiral separation and so on.
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