PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Richeng Lian,Yihao Jiang,Yaqin Zhang,Qingyao Gao,Haocun Guan,Lei Liu,Xilei Chen,Chuanmei Jiao
In recent years, developing bio-based intumescent flame-retardant (IFR) epoxy coatings for fire protection of steel has become a research hotspot. However, how to endow bio-based IFR epoxy coatings with excellent fire protection, toxic gas suppression, and mechanical properties simultaneously remains a formidable challenge. Here, a bio-based IFR hybrid with the maize structure (PAbz@PBA) was easily constructed by an organic-inorganic hybrid strategy and employed to prepare high-performance IFR epoxy coatings. It has been shown that PAbz@PBA hybrids enhance the curing activity of epoxy coatings in addition to their good dispersion and interfacial compatibility. Notably, the epoxy coating containing 5.0 wt% PAbz@PBA (EP-5%PAbz@PBA) exhibits more efficient fire protection (peak heat release rate and total heat release are reduced by 48.3 % and 34.0 %, respectively), smoke suppression (total smoke production is decreased by 35.9 %), and toxic gas suppression (peak CO production rate is reduced by 39.6 %) compared to the virgin epoxy coating. Meanwhile, the heat insulation performance of EP-5%PAbz@PBA shows superiority compared to that of the virgin epoxy coating, as reflected by its lowest backside temperature (66.3 °C). Furthermore, compared with the virgin epoxy coating, EP-5%PAbz@PBA exhibits improved flexural and impact strengths. This work offers a viable idea for designing bio-based PAbz@PBA hybrids and preparing IFR epoxy coatings with various excellent properties.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Enchao Wang,Li Chen,Xinmiao He,Yucheng Xiang,Shuangyi Jia,Yisheng Chen,Zhongxiang Guo,Junyi Luo,Hui Dan,Yi Ding,Tao Duan
The development of Bi-based composites with low cost, high adsorption capacity and retention is highly desired for iodine gas capture. Herein, three novel Bi-based composites (Bi 0 -SiO 2 , Bi 0 -C/SiO 2 and Bi 0 -C) were prepared by simple sintering process using rice husk as C and SiO 2 sources and applied for iodine gas capture. The results demonstrated that the type of support strongly affected the iodine adsorption and retention. The Bi 0 -SiO 2 , Bi 0 -C/SiO 2 and Bi 0 -C composites exhibited the iodine adsorption capacity of 812, 911 and 1334 mg/g, and the iodine retention ratio of 90.9, 86.9 and 65.4%. The Bi 0 -SiO 2 showed the highest iodine retention because the SiO 2 supports have no affinity for iodine and the adsorption mainly came from the chemical adsorption of Bi 0 (2Bi + 3I 2 = 2BiI 3 ). While the Bi 0 -C exhibited the highest adsorption capacity due to the synergistic adsorption effect between C supports and Bi 0 sites. Except for the chemical reaction, charge transfer between C and I (C-I) also contributed to the iodine adsorption. The results demonstrated that the new Bi-based composites would be promising iodine gas adsorbent and the new strategy could be extended to the development of other adsorbents.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Bo Zhou,Ben-Xu Jia,Ming-Jin Zhang,Yan-Jun Tan,Wei-Yuan Liang,Xiang Gan,Hong-Tao Li,Xiaoli Yang,Xing-Can Shen
Zn 2+ and H 2 S are essential to maintain normal prostate function, and sometimes can evolve into weapons to attack and destroy prostate cancer (PCa) cells. Nevertheless, how to achieve the targeted and effective release of Zn 2+ and H 2 S, and reverse the concentration distribution within PCa tumor cells still highly challenging. Herein, combined with these pathological characteristics of prostate, we proposed a tumor microenvironment (TME) responsive Zn 2+ -interference and H 2 S-mediated gas synergistic therapy strategy based on a nanoplatform of tannic acid (TA) modified zinc sulfide nanoparticles ( [email protected] ) for the specific treatment of PCa. Once the constructed pH-responsive [email protected] internalized by cancer cells, it would instantaneously decomposed in acidic TME, and explosively release excess Zn 2+ and H 2 S exceeding the cell self-regulation threshold. Meanwhile, the in situ produced Zn 2+ and H 2 S synergistic enhancement of cell apoptosis, which is evidenced to increase levels of Bax and Bax/Bcl-2 ratio, release of Cytochrome c in cancer cells, contributing to inhibit the growth of tumor. Moreover, the TA in cooperation with Zn 2+ specifically limits the migration and invasion of PCa cells. Both in vitro and in vivo results demonstrate that the Zn 2+ -interference in combination with H 2 S-mediated gas therapy achieves an excellent anti-tumor performance. Overall, this nanotheranostic synergistic therapy provides a promising direction for exploring new strategies for cancer treatment based on specific tumor pathological characteristics, and provides a new vision for promoting practical cancer therapy.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaoping Li,Xinpeng Wang,Lei Dong,Qing Zou,Chunlin He,Yanqiu Zhu,Toyohisa Fujita,Changzhong Liao,Cheng-Wei Kao,Ying-Rui Lu
As the main fission products of nuclear power plants, radioactive iodine isotopes are of great concern because of their great harm to public safety. In this work, a nanocomposite of bismuth sulfide coated with the electrospinning SiO2 nanofibers with a diameter of about 280 nm nanostructure-based membranes (Bi2S3@SiO2) was successfully prepared to dispose of gaseous iodine. Results showed that the adsorption capacity of Bi2S3@SiO2 for iodine can be up to 1180 mg g–1, which is higher than the commercial silver-exchanged zeolite (AgZ) and other bismuth-based adsorbents. Chemisorption is the major adsorption behavior of iodine capture. Thermogravimetric analysis results demonstrated that the Bi2S3@SiO2 nanocomposites were stable up to 300 °C before and after capturing iodine. X-ray diffraction results revealed that BiSI was initially formed and then transformed to BiI3. Scanning electron microscopy revealed that the sulfur element remains in the samples after interacting with iodine, and X-ray absorption near-edge spectra further confirmed that its oxidation states are a mixture of S0, S3+, and S6+. The oxidation states of bismuth and iodine are Bi3+ and I–, respectively, revealed by X-ray photoelectron spectroscopy. The reactions between Bi2S3@SiO2 nanocomposites and I2 vapor are as follows: I2 was reduced to be I– and the BiI3 crystalline phase is the final form; S2– in Bi2S3 was oxidized to higher valences (S0, S3+, and S6+), and amorphous phases are their final forms. The research results demonstrated that the nanostructure-based membranes prepared by this work would be a promising candidate nanomaterial for capturing iodine in the plant off-gas streams.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 10
·2209-2221
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IF 3.286
Zhang Yinchenxi,Duan Yixiang
A solid-phase microextraction (SPME) fiber based on a new polymeric ionic liquid was prepared for the extraction of trace aromatic amines in water and their detection by gas chromatography–mass spectrometry (GC–MS). The newly designed polymeric ionic liquid with two functional groups (benzene ring and ether group) was synthesized and fixed on stainless steel wire to effectively extract aromatic amines. Parameters that affect the extraction efficiency of the SPME fiber (extraction temperature, extraction time, alkali concentration, and salt concentration) were optimized to establish a headspace SPME–GC–MS method. The correlation coefficients were 0.996 or greater for concentration of the aromatic amines ranging from 0.01 to 10 μg mL -1 . In addition, the limits of detection for the new fiber are as low as 0.67 ng mL -1 , which is lower than that obtained with polyacrylate. The relative standard deviations of five consecutive extractions for the solution spiked at 1 μg mL -1 by the same fiber were all below 8.3%, and the interfiber relative standard deviations for the solution spiked at the same concentration ranged from 8.9% to 15.2%. Furthermore, long lifetime and good solvent resistance are exhibited by the fiber. Finally, satisfactory relative recovery in the range from 85.3% to 101.9 % was achieved for two environmental water samples.
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JOURNAL OF SEPARATION SCIENCE
·
2018
·Vol. 42
·期 4
·851-861
·
IF 2.415
Zigang Tang,Qing Han,Li Xie,Lanling Chu,Yu Wang,Ying Sun,Xuejun Kang
A novel polystyrene/pyridine composite nanofiber was synthesized and utilized as the sorbent material for the solid-phase extraction of bisphenol A and five common phthalate esters in milk. The method of extraction integrated extraction and preconcentration of target analytes into a single step. Bisphenol A and five common phthalate esters were selected as target compounds for the development and evaluation of the method. The effects of operating parameters for nanofiber-based solid-phase extraction, such as selection and amount of sorbent, the volume fraction of perchlorate (precipitate protein), desorption solvent, volume of desorption solvent, and effect of salt addition were optimized. Under optimal conditions, higher extraction recoveries (89.6–118.0%) of the six compounds in milk spiked at three levels were obtained, and the satisfied relative standard deviation were ranged from 0.6 to 10.9%. The detection limits and quantification limits of the method ranged from 0.01 to 0.06 μg/L and 0.05 to 0.53 μg/L, respectively. Matrix effects were also verified and well controlled in the range of 91.3–109.3%. The new method gave better performance metrics than Chinese standard method and other published methods. Thus, the proposed method may be applied to the analysis of the phthalate esters and bisphenol A in complex matrixes.
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Analytical Methods
·
2019
·Vol. 11
·期 11
·1541-1550
·
IF 2.378
Ping Chen,Bing Liu,Xin Liu,Jihong Fu
In this research, a novel method based on ultrasound-assisted extraction and dispersive liquid–liquid microextraction (UAE-DLLME) coupled with gas chromatography-mass spectrometry (GC-MS) has been successfully developed for the determination of essential oil constituents in lavender. The effective parameters of UAE-DLLME, including the type of extraction solvent, type and volume of preconcentration solvent, type and volume of disperser solvent, extraction temperature, and extraction time, were studied and optimized in detail. The optimal analytical conditions were as follows: 2 mL 50% ethanol as the extraction solvent, 150 μL methanol as the disperser solvent, 40 μL CCl4 as the preconcentration solvent, an extraction time of 20 min and an extraction temperature of 50 °C. Under the optimum conditions, a total of 13 samples of three varieties of lavender were analyzed and 64 compounds were identified. The precision of UAE-DLLME-GC-MS was evaluated and the relative standard deviation (RSD) was below 9% (n = 5). Good linearity with correlation coefficients of >0.9982 was obtained; limits of detection ranging from 1.75 to 7.50 ng indicated high sensitivity. Principal component analysis (PCA) was used to distinguish different varieties of lavender. This is the first application of UAE-DLLME for the analysis of essential oil constituents in lavender. The results showed that UAE-DLLME-GC-MS is a fast, sensitive, simple and small sample consumption method for the determination of essential oils in plant materials.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Ziying Wang,Andre Sackmann,Shang Gao,Udo Weimar,Geyu Lu,Sen Liu,Tong Zhang,Nicolae Barsan
Highly selective oxidizing gas sensors are of great importance for environmental pollution monitoring. In this work, a hybrid material containing Zn 2 SnO 4 nanoparticles (NPs) and immobilized reduced graphene oxide (Zn 2 SnO 4 -RGO) was developed as a high performance gas sensing material for the detection of ppb-levels of oxidizing gases (NO 2 and O 3 ). The structural, morphological and compositional properties of the Zn 2 SnO 4 -RGO hybrids were systematically characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), which demonstrated the successful anchoring of Zn 2 SnO 4 NPs on RGO nanosheets. The obtained Zn 2 SnO 4 -RGO hybrids exhibited outstanding sensing performance for detecting oxidizing gases (NO 2 and O 3 ) with very low cross sensitivities to reducing gases, such as C 2 H 5 OH, CH 3 COCH 3 and CO. The Zn 2 SnO 4 -RGO based sensors exhibited high response values of up to 3.50 for 500 ppb NO 2 , which is higher than that for detection of 500 ppb O 3 (1.78) at 30 °C under 50% relative humidity (RH). Moreover, the NO 2 sensing performances of Zn 2 SnO 4 -RGO-based sensors were investigated under various RH. In all cases, the sensors based on RGO and Zn 2 SnO 4 -RGO hybrids presented p-type behavior. The sensors based on Zn 2 SnO 4 -RGO hybrids also exhibited high response values of up to 3.62 for 1 ppm NO 2 at 50 °C in 80% RH, which is much higher than that of pure RGO (1.31). The excellent sensing performances are mainly ascribed to the synergetic effect of Zn 2 SnO 4 NPs and RGO. Furthermore, the surface reaction between Zn 2 SnO 4 -RGO hybrids and NO 2 can be concluded from Operando diffuse reflectance infrared Fourier transformed spectroscopy (Operando DRIFT).
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ENERGY & FUELS
·
2019
·
IF 3.021
Zhangjin Wu,Yucui Hou,Weize Wu,Shuhang Ren,Kai Zhang
Sulfur dioxide (SO2) is the main component of air pollution. Recently, sodium lactate (NaLa) aqueous solution (aq) was demonstrated as a highly efficient, renewable, and stable absorbent for SO2 absorption from flue gas. However, sulfuric acid (H2SO4) accumulated during long-term SO2 absorption and desorption cycles. To remove H2SO4 from NaLa (aq) efficiently, a method based on the common-ion effect was proposed in this work. The results indicated that the residual concentration of sulfate anion (SO42–) decreased with decreasing the water content. Residual SO2 in NaLa (aq) did not influence the removal of H2SO4. After the removal, the content of residual SO42– was 0.47 wt % and the removal rate of H2SO4 was 95.6%, with a water content of 34 wt % at 20 °C. In comparison to other reported methods, our method to remove H2SO4 in absorbents did not introduce other ions and block the absorption tower. It was noted that the evaporation of water to decrease the water content was combined with the regeneration of NaLa (aq), without any extra evaporation energy. NaLa (aq) was not changed during the removal process. Moreover, the SO2 absorption capacity in H2SO4-removed NaLa (aq) was comparable to the capacity of virgin NaLa (aq), and no obvious change could be found after 5 cycles of H2SO4 removal. The mechanism of removing H2SO4 from NaLa (aq) studied with Fourier transform infrared spectroscopy indicated that H2SO4 was removed in the form of Na2SO4 without crystal water as a result of the common-ion effect. Furthermore, a new process for SO2 absorption with H2SO4 removal from NaLa (aq) was proposed.
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Nano Research
·
2018
·Vol. 11
·期 3
·1490-1499
·
IF 7.994
Du Haoran,Huang Kuangfu,Li Min,Xia Yuanyuan,Sun Yixuan,Yu Mengkang,Geng Baoyou
Porous hollow Co 3 O 4 microspheres have been synthesized from a mixed cobalt nitrate and urea solution through spray pyrolysis followed by calcination at 600 °C in air. This porous hollow Co 3 O 4 is assembled by nanoparticles and exhibits variable porosity depending on the amount of gas in the system. In pyrolysis process, urea continuously decomposes into gaseous components, which act as a template to control the porous structure. The amount of gas escaping from precursor droplets can directly influence the porosity of the microspheres and the size of the nanoparticles controlled by the ratio of urea to cobalt nitrate. Electrochemical measurements show that the performance of the porous hollow Co 3 O 4 microspheres is related to the porosity and size of the nanoparticles. The sample with optimal porosity delivers a high first charge capacity of 1,417.9 mAh·g −1 at 0.2C (1C = 890 mA·g −1 ), and superior charge cycle performance of 1,012.7 mAh·g −1 after 100 cycles. In addition, the optimized material displays satisfactory rate performance of 1,012.4 mAh·g −1 at 1C after 50 cycles and 881.3 mAh·g −1 at 2C after 300 cycles. Superior charge/discharge capacity, excellent rate performance and high yield achieved in this study is promising for the development of high-performance Co 3 O 4 anode materials for lithium-ion batteries.
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CELLULOSE
·
2018
·Vol. 25
·期 10
·5999-6010
·
IF 3.809
Ma Shanshan,Zhang Meiyun,Nie Jingyi,Yang Bin,Song Shunxi,Lu Peng
Environmental threats, especially particulate matter, toxic gases and microbial pollution, have done serious harm to human health. In this paper, biodegradable composite filters were fabricated by an in situ deposition method to isolate pollutants and inactivate bacteria. The zeolitic imidazolate framework-8@cellulose fibers (ZIF-8@CF) filters had filtration efficiency as high as 98.36% and 99.94% against 0.3 μm and 0.5 μm particles, respectively, under a pressure drop of 134 Pa. Moreover, the nitrogen adsorption capacities of the composites were about 20 times higher than those of pure cellulose filters. In addition, the Ag-based metal–organic frameworks@cellulose fibers (Ag-MOFs@CF) exhibited excellent antimicrobial activity against Escherichia coli ( E. coli ) with an inhibition zone diameter of 20.8 mm. Herein, these metal–organic frameworks@cellulose fibers (MOFs@CF) composite filters with high filtration efficiency, gas adsorption and antibacterial properties could be potentially applied in alleviating air pollution and in healthcare fields.
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RSC Advances
·
2018
·Vol. 8
·期 17
·9074-9082
·
IF 2.936
Lin-Ning Zhang,Long Wang,Zi-Qi Shi,Ping Li,Hui-Jun Li
The extreme complexity of the chemical composition of plant extracts requires an unbiased and comprehensive detection methodology to improve the potential of metabolomic study. The present work, taking five closely related cultivars of Chrysanthemum flowers as a typical case, attempts to develop a metabolomic strategy to find more markers of metabolites for precise differentiation based on headspace gas chromatography-mass spectrometry (HSGC-MS) and ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UHPLC-QTOF/MS). In detail, 53 batches of Chrysanthemum flower samples were collected and analyzed. The fusion of datasets from HSGC-MS and UHPLC-QTOF/MS was done in two different ways. After comparison, the fusion of the total peak area normalized metabolomic data was performed for multivariate statistical analysis. A total of 21 marker compounds (including 14 volatile and 7 nonvolatile metabolites) were identified, and a heatmap was employed for clarifying the distribution of the identified metabolites among the five cultivars. The results indicated that the integrated platform benefited the metabolomic study of medicinal and edible herbs by providing complementary information through fully monitoring functional constituents.
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