CELLULOSE
·
2022
·Vol. 29
·期 15
·8473-8488
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IF 6.123
Yang Yu-Ting,Huang Jia-Li,Wang Xin,Grunlan Jaime,Song Lei,Hu Yuan
Phosphorus–nitrogen–silicon-containing coatings consisting of tris(hydroxymethyl)phosphine oxide (THPO), 3,5-diamino-1,2,4-triazole (guanazole), and polydimethylsiloxane (PDMS) were prepared via a simple spraying deposition technique and applied to the cotton fabric to impart flame retardancy and hydrophobicity. SEM image reveals that THPO/Guanazole/PDMS-coated fabric has a rough surface and XPS spectra confirm the composition of the coating on the cotton surface. Direct flame testing indicates that the as-prepared coating can protect the cotton from burning. The limiting oxygen index increased from 18.0% for the uncoated fabric to 32.0% for the THPO/Guanazole-treated sample and 27.0% for the THPO/Guanazole/PDMS-treated sample. Furthermore, with additional THPO/Guanazole, there was a gradual reduction in PHRR values, 60% (79.0 kW/m 2 ) for C2 and 76% (48.2 kW/m 2 ) for C3 lower than that of untreated cotton. After hydrophobic treatment of C2 with PDMS, the PHRR is reduced to 127.5 kW/m 2 (35.5% for C2-PDMS). Additionally, the coated cotton displays impressive hydrophobicity with a water contact angle of 133°. This unique approach provides a facile and effective flame retardant and hydrophobic treatment for cotton fabric.
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JOURNAL OF SOLUTION CHEMISTRY
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2022
·Vol. 51
·期 10
·1247-1267
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IF 2
Yu Yingmin,Li Min,Liu Lanmu,Li Jun,Song Yuhe
In this paper, the separation of the p-xylene and ethylbenzene was explored. The COSMO-SAC-UNIFAC model, σ-profile analysis, solvent power and selectivity were used to screen for a suitable solvent for this process. Then, 1,2,4-trichlorobenzene was selected as target solvent to extract the p-xylene from ethylbenzene. The vapor–liquid-phase equilibrium (VLE) data for binary systems of p-xylene + ethylbenzene, p-xylene + 1,2,4-trichlorobenzene, and ethylbenzene + 1,2,4-trichlorobenzene and ternary system of p-xylene + ethylbenzene + 1,2,4-trichlorobenzene were determined with a modified Rose still at atmospheric pressure (101.3 kPa) and all the binary data passed the Wisniak’s test, which accorded with the thermodynamic consistency. Three thermodynamic models, Wilson, NRTL and UNIQUAC were used to correlate the VLE data and get binary interaction parameters, then the ternary VLE data of p-xylene + ethylbenzene + 1,2,4-trichlorobenzene were estimated based on these model parameters using Aspen Plus V10. The estimation values of the three models are in good agreement with the experimental data. Moreover, the effect of 1,2,4-trichlorobenzene was analyzed and it was found to be an effective candidate extractant for the extractive distillation of ethylbenzene from mixed xylenes.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 10
·4287-4311
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IF 3.134
Xu Yanming,Zhang Shuyuan,Zhao Yuhao,Yang Jingjing,Shen Shusu,Zhang Ganwei,Guo Yongfu,Zheng Xinyu
To enhance the adsorption capacity and improve agglomeration properties of kaolin during the adsorption process of Hg 2+ from aqueous solution, kaolin was bi-functionally modified using L-cysteine and polypyrrole. The as-synthetized adsorbent of L-Ppy-Fe 3 O 4 /kaolin was characterized before and after modification. The removal conditions were optimized by response surface methodology, and the optimized results show that the optimal adsorption capacity of Hg 2+ reaches 482.71 mg/g at pH of 7.9, temperature of 315 K, initial concentration of 40 mg/L and dosage of 0.05 g/L. And the effects of adsorption conditions on Hg 2+ removal follow the order of solution pH > temperature > initial concentration > dosage. The adsorption process of Hg 2+ in aqueous solution can be well described by pseudo-second-order kinetic model and Langmuir isothermal model. Moreover, the thermodynamic fitting indicates that the adsorption of Hg 2+ is an endothermic and spontaneous process. The adsorption mechanism of Hg 2+ onto L-Ppy-Fe 3 O 4 /kaolin is mainly the complexation between divalent Hg 2+ and sulfhydryl/amino groups to form stable metal complexes, and electrostatic attraction is also a part of the reaction mechanism. In addition, L-Ppy-Fe 3 O 4 /kaolin is proved to have satisfactory dispersion ability and chemical stability and can be easily separated and recovered after adsorption in aqueous solution. Therefore, L-Ppy-Fe 3 O 4 /kaolin is a promising adsorbent for the efficient removal of mercury ions. Graphical abstract
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TRIBOLOGY LETTERS
·
2022
·Vol. 70
·期 3
·1-14
·
IF 3.327
Wu Can,Xie Yijia,Zhao Huijun,Yang Haining,Li Xinglin,Ni Jing
The influences of Hexagonal boron nitride (hBN) and Calcium carbonate (CaCO 3 ) nanoparticles on tribological and bearing vibration properties of polyurea grease (PG) were investigated. The microstructure, friction coefficient, wear morphology, and bearing vibration test of five components of greases were conducted. The results showed that the addition of 1 wt% hBN, playing the role of isolation protection and nano-abrasive, could improve the wear and vibration reduction performance of PG. However, the addition of CaCO 3 nanoparticles at the same time, playing the role of deposition and recovery, could further improve the tribological and vibration reduction performance of PG, which was attributed to the synergistic effect of CaCO 3 and hBN particles. The findings revealed that PG with the addition of 1 wt% hBN + 5 wt% CaCO 3 nanoparticles had the greatest tribological and vibration suppression performance, which is due to the synergistic effect of hBN and CaCO 3 nanoparticles. Additionally, the wettability tests showed that the addition of hBN and CaCO 3 nanoparticles could significantly increase the flow of base oil on the PG soap fibers, resulting in the most effective bearing vibration suppression.
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Scientific Reports
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2022
·Vol. 12
·期 1
·1-13
·
IF 4.996
Li Miaomiao,Li Qingqing,Yao Jun,Sunahara Geoffrey,Duran Robert,Zhang Qinghua,Ruan Zhiyong
The overuse of the herbicide nicosulfuron has become a global environmental concern. As a potential bioremediation technology, the microbial degradation of nicosulfuron shows much promise; however, the mechanism by which microorganisms respond to nicosulfuron exposure requires further study. An isolated soil-borne bacteria Pseudomonas nicosulfuronedens LAM1902 displaying nicosulfuron, chlorimuron-ethyl, and cinosulfuron degradabilities in the presence of glucose, was used to determine the transcriptional responses to nicosulfuron exposure. RNA-Seq results indicated that 1102 differentially expressed genes (DEGs) were up-regulated and 702 down-regulated under nicosulfuron stress. DEGs were significantly enriched in “ABC transporters”, “sulfur metabolism”, and “ribosome” pathways ( p ≤ 0.05). Several pathways (glycolysis and pentose phosphate pathways, a two-component regulation system, as well as in bacterial chemotaxis metabolisms) were affected by nicosulfuron exposure. Surprisingly, nicosulfuron exposure showed positive effects on the production of oxalic acid that is synthesized by genes encoding glycolate oxidase through the glyoxylate cycle pathway. The results suggest that P. nicosulfuronedens LAM1902 adopt acid metabolites production strategies in response to nicosulfuron, with concomitant nicosulfuron degradation. Data indicates that glucose metabolism is required during the degradation and adaptation of strain LAM1902 to nicosulfuron stress. The present studies provide a glimpse at the molecular response of microorganisms to sulfonylurea pesticide toxicity and a potential framework for future mechanistic studies.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 23
·18345-18355
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IF 2.779
Gao Liang,Zhang Jiaqi,Song Lingyun,Bai Xilong,Yu Changxing
Polymer film capacitors have a high power density and great application potential in high-power electronic devices; however, high-energy storage density of polymer composites is usually obtained via doping high-content ceramic filler. An efficient approach to solve this issue is to dope polymers with an ultralow-content ceramic filler to improve their energy storage density. In this work, one-dimensional (1D) TiO 2 nanobelts@SiO 2 (TO nb@SO) are prepared via the hydrothermal reaction, muffle calcination, and hydrolysis. Extremely low-content TO nb@SO/poly(vinylidene fluoride) (TO nb@SO/PVDF) composites are prepared. The microstructure, crystalline structure, dielectric properties, electric breakdown strength, and discharge energy density are systematically investigated. The results show that the nanobelts have a width of 250 nm, a length of 1–2 μm, and a uniform shell layer at the edge with a thickness of ∼25 nm. The relative dielectric constant of the composites is significantly enhanced; it reaches 11 for PVDF at 100 Hz, and 12.03 for 0.5 wt% TO nb@SO/PVDF. The theoretical dielectric constant is calculated based on a mathematical model and compared with the measured value. 1D materials with a large aspect ratio are beneficial in the improvement of the dielectric properties. The Weibull breakdown field strength is 381.3 MV/m for 0.5 wt% TO nb@SO/PVDF. A discharge energy density of 8.86 J/cm 3 is obtained at 390 MV/m, while a high charge/discharge efficiency of 66.28% is achieved. To conclude, this work provides a valuable method for increasing the energy storage density and charge/discharge efficiency of dielectric capacitors.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-12
·
IF 17.694
Song Jianing,Zhang Wenluan,Sun Zhengnan,Pan Mengyao,Tian Feng,Li Xiuhong,Ye Ming,Deng Xu
To fight against global warming, subambient daytime radiative cooling technology provides a promising path to meet sustainable development goals. To achieve subambient daytime radiative cooling, the reflection of most sunlight is the essential prerequisite. However, the desired high solar reflectance is easily dampened by environmental aging, mainly natural soiling and ultraviolet irradiation from sunlight causing yellowish color for most polymers, making the cooling ineffective. We demonstrate a simple strategy to use titanium dioxide nanoparticles, with ultraviolet resistance, forming hierarchical porous morphology via evaporation-driven assembly, which guarantees a balanced anti-soiling and high solar reflectance, rendering anti-aging cooling paint based coatings. We challenge the cooling coatings in an accelerated weathering test against simulated 3 years of natural soiling and simulated 1 year of natural sunshine, and find that the solar reflectance only declined by 0.4% and 0.5% compared with the un-aged ones. We further show over 6 months of aging under real-world conditions with barely no degradation to the cooling performance. Our anti-aging cooling paint is scalable and can be spray coated on desired outdoor architecture and container, presenting durable radiative cooling, promising for real-world applications.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-11
·
IF 17.694
Liu Yuzhao,Meng Xiangyu,Wang Zhiyu,Qiu Jieshan
Anode-free lithium batteries without lithium metal excess are a practical option to maximize the energy content beyond the conventional design of Li-ion and Li metal batteries. However, their performance and reliability are still limited by using low-capacity oxygen-releasing intercalation cathodes and flammable liquid electrolytes. Herein, we propose quasi-solid-state anode-free batteries containing lithium sulfide-based cathodes and non-flammable polymeric gel electrolytes. Such batteries exhibit an energy density of 1323 Wh L −1 at the pouch cell level. Moreover, the lithium sulfide-based anode-free cell chemistry endows intrinsic safety thanks to a lack of uncontrolled exothermic reactions of reactive oxygen and excess Li inventory. Furthermore, the non-flammable gel electrolyte, developed from MXene-doped fluorinated polymer, inhibits polysulfide shuttling, hinders Li dendrite formation and further secures cell safety. Finally, we demonstrate the improved cell safety against mechanical, electrical and thermal abuses.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 10
·2231-2246
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IF 2.747
Wang Li,Wang Junbo,Yu Aishui,Yu Zuolong
In this paper, removal of malachite green (MG) by two separate processes, namely electrochemical oxidization polymerization and electrochemical reduction precipitation process, was studied. Reaction rate constants ( k 0 ), exchange current density i 0 , the transfer coefficients β and the diffusion coefficient D values were all tested. TR-FTIR (time-resolved Fourier transform infrared spectroscopy), UPLC-MS (ultra-performance liquid chromatography–mass spectrometry), and GC–MS (gas chromatography–mass spectrometer) analyses were applied to investigate the pathway and mechanism of MG degradation. The results show that both electrochemical oxidization polymerization and electrochemical reduction precipitation process were efficient to remove MG.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 22
·17868-17876
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IF 2.779
Chi Qingguo,Zhang Xiaowen,Zhang Changhai,Feng Yu,Tang Chao,Li Zhonghua,Zhang Tiandong
The ever-increasing development of power modules requires epoxy (EP) encapsulants to have excellent heat-resistance capability. Many studies have been conducted on improving the heat-resistance of epoxy encapsulants and have made important achievements in recent years. However, the electrical insulation of the EP-based high heat-resistance materials has not been paid enough attention and less studied. In this paper, BMI/EP systems have been prepared, and the electrical characteristics and heat-resistance of the modified BMI/EP have been investigated. Dynamic thermomechanical analysis shows the introduction of BMI greatly improves the heat-resistance of the epoxy systems. The electrical conductivity and breakdown characteristics of BMI/EP samples were measured at 30, 50, and 70 °C, respectively. The analysis of space charge indicates the trap distribution in the 10%BMI can significantly suppress carrier migration, resulting in the highest electric breakdown strength and the lowest current density. The excellent insulation properties with improved heat-resistance demonstrate that BMI/EP has great potential to be used in power modules.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 10
·1-12
·
IF 6.408
Liao Linhong,Tong Simiao,Luo Xiaogang,Liu Genyan,Wu Fengshou
A new iron porphyrin-based organic polymer (Fe-POP) was synthesized through the William ether reaction. The as-prepared Fe-POP presented high chemical stability, wide pore distribution, high iron content, and strong affinity with 3,3’,5,5’-tetramethylbenzidine (TMB) and hydrogen peroxide (H 2 O 2 ), which contributed to its excellent peroxidase-mimicking performance. In the presence of H 2 O 2 , Fe-POP could catalyze the transparent TMB into blue ox-TMB, which could be easily distinguished by the naked eyes. Moreover, glutathione (GSH) and ascorbic acid (AA) could convert blue ox-TMB into colorless TMB due to the inhibitory effect of GSH/AA to the catalytic oxidation of TMB. Based on this phenomenon, a rapid and sensitive colorimetric method for the assay of H 2 O 2 , GSH, and AA was developed using Fe-POP as sensor. The detection limits of H 2 O 2 , GSH, and AA were 1.37, 0.44, and 0.33 μM, respectively. Finally, the colorimetric method based on Fe-POP was used to evaluate the GSH and AA content in real samples, which provided the guidance for GSH and AA supplements in our daily diet, suggesting the significant potential of Fe-POP in practical applications. Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 5
·13197-13209
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IF 5.19
Xi GaoYang,Chen Shuxun,Zhang Xuhang,Xing Yu,He Zhengguang
In this study, natural chalcopyrite (NCP) was used to activate peroxymonosulfate (PMS) to degrade carbamazepine (CBZ) oxidatively. Before and after the NCP reaction, the physical and chemical properties were characterized by SEM–EDS, XRD, XPS, XRF, and VSM. The effects of the amount of NCP and PMS, the initial pH value, and the reaction temperature on the catalytic performance of NCP were systematically studied. The research results show that the degradation efficiency of the NCP/PMS system for CBZ can reach 82.34% under the optimal reaction conditions, and the degradation process follows a pseudo-second-order kinetic model. The results of the radical quenching experiment and EPR analysis show that the active species in the system are OH·, SO 4 − ·, and 1 O 2 , of which SO 4 − · is the main active species. In addition, this study shows that the NCP/PMS system can degrade CBZ with high efficiency of 90.73% only with the assistance of 0.15 g/L Fe 0 . This study determined the optimal reaction conditions for natural chalcopyrite to activate PMS to degrade CBZ and clarified the activation mechanism, which broadened the application of natural ores in the field of water treatment.
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