RSC Advances
·
2018
·Vol. 8
·期 66
·38124-38130
·
IF 2.936
Jiaojing Zhang,Hua Song,Yanguang Chen,Tianzhen Hao,Feng Li,Dandan Yuan,Xueqin Wang,Liang Zhao,Jinsen Gao
Amine-modified MCM-41 adsorbents (APTMS/MCM-41, PEI/MCM-41 and AAPTS/MCM-41) were prepared and characterized by XRD, N2 adsorption–desorption, FT-IR, TEM, SEM and TG-DTA. The performance of each adsorbent in a fixed adsorption bed for H2S removal was measured using a mixture of oxygen, nitrogen and hydrogen sulfide gases. It was found that the specific surface area decreased and the topography changed significantly after the use of each modified adsorbent. Nevertheless, all amine-modified MCM-41 adsorbents retained mesoporous silica of MCM-41. The H2S removal rate and saturated H2S capacity of APTMS/MCM-41 improved from 32.3% to 54.2% and 119.5 to 134.4 mg g−1, respectively, compared with that of MCM-41, and it showed the best performance among all adsorbents. APTMS/MCM-41, PEI/MCM-41 and AAPTS/MCM-41 were regenerated by maintaining at 423, 523 and 373 K in nitrogen for 3 h, respectively, and thus possessed high regenerability.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2022
·
IF 4.373
Zhijuan Zhang,Pengwei Li,Ting Zhao,Yuanhan Xia
The ZIF-8 crystals were successfully postsynthetically modified using methylamine (MA), ethylenediamine (ED), and N, N-dimethylethylenediamine (MMEN) to improve their adsorption performance toward CO2. Results showed that, compared with the original ZIF-8, the BET specific surface area of MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 has increased by 118.2%, 92.0%, and 29.8%, respectively. In addition, their total pore volume increased separately by 130.8%, 100%, and 48.7%. The adsorption capacities of CO2 on the amine-modified ZIF-8 samples followed the order . The CO2 adsorption capacities at 298 K on MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 were increased by 118.2%, 90.2%, and 29.8%, respectively. What is more, the CO2/N2 selectivities calculated using an IAST model of the amine@ZIF-8 samples at 0.01 bar and 298 K were also significantly improved and followed the order , which increased by 173.0%, 121.4%, and 22.6%, respectively. The isosteric heat of CO2 adsorption () on the MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 all becomes higher, while of N2 on these samples was slightly lower in comparison with that on the ZIF-8. Furthermore, after six recycle runs of gravimetric CO2 adsorption-desorption on MA-ZIF-8, the adsorption performance of CO2 is still very good, indicating that the MA-ZIF-8 sample has good regeneration performance and can be applied into industrial CO2 adsorption and separation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Zhoubing Cheng,Qunpeng Cheng
ABSTRACT In this study, the performance of modified MCM-41 adsorbents by impregnation and grafting modification with 3-aminopropyltriethoxysilane (APTS) and polyethyleneimine (PEI) on the CO 2 adsorption was investigated. The results showed that the synergistic effect of APTS and PEI could improve the adsorption performance and thermal stability of the MCM-41 adsorbents. The CO 2 adsorption capacity of mixed amine-modified MCM-41 adsorbents was higher than single amine modified MCM-41 adsorbents. The maximum adsorption capacity (2.6512 mmol g –1 ) was obtained at MCM-41-APTS-5%-PEI-50%. Meanwhile, the adsorbents modified by mixed amine showed good cycle regeneration stability after five times of CO 2 adsorption/desorption cycling.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Yi Liao,Shan-Shan Chai,Wei-Bin Zhang,Yao Yao,Jing-Lei Yang,Yi Yin,Jia-Jun Li,Ze-Qin Yang,Xue-Jing Ma,Qiang Peng
Clay minerals, naturally occurring two-dimensional layered nanomaterials, hold significant interest in electrochemical energy storage. However, their practical use is hindered by the pronounced stacking and aggregation of layers. Here, we selected eight clay minerals of kaolinite, halloysite, montmorillonite, vermiculite, palygorskite, sepiolite, talc and chlorite, employed a simple chemical water bath method to insert diamine molecules with different chain lengths between the layers of these minerals. This approach aimed to prevent stacking and aggregation while allowing controlled expansion of the layer spacing. Subsequently, the montmorillonite (M) with relatively high specific capacitance were selected for further discussion. X-ray diffraction results show that the layer spacings of diamine ( x DM, x = 2–6) modified montmorillonite (M/ x DM) could be optimized within 1.189 nm and 1.455 nm, of which the butanediamine (4DM) pillared montmorillonite composites (M/4DM) exhibited the most suitable layer spacing of 1.362 nm for efficient Na 2 SO 4 ion transportation. Additionally, the CeO 2 loaded montmorillonite (CeO 2 -M) composites were further prepared by the same method to obtain diamine pillared CeO 2 loaded montmorillonite (CeO 2 -M/ x DM). The specific capacitance of CeO 2 loaded and butanediamine pillared montmorillonite composites (CeO 2 -M/4DM) was 573.9 F g −1 , which was 33.9% higher than the counterpart without modification (CeO 2 -M). The assembled supercapacitor CeO 2 -M/4DM//AC exhibited almost no loss in capacitance after 10,000 cycles.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
APPLIED ENERGY
·
2019
·
IF 8.426
Chuanwen Zhao,Yafei Guo,Junjie Yan,Jian Sun,Weiling Li,Ping Lu
Co-firing of coal and biomass blends provides a promising route for clean energy utilization with high efficiency and mitigated pollutants emission. However, the technology meets an important challenge in effective utilization of the co-firing fly ashes. Efforts have been made to valorize the co-firing fly ash residues as potential CO 2 sorbents. To achieve enhanced CO 2 sorption performance, the samples were modified with tetraethylenepentamine (TEPA). Effects of amine loading, CO 2 sorption temperature, initial CO 2 concentration and gas flow rate on CO 2 sorption behaviors of the amine-tethered sorbents were investigated. The desired sorbent with 25% TEPA loading presented the highest CO 2 sorption capacity of 1.19 mmol CO 2 /g when tested under 60 °C and 15%CO 2 with a total gas flow rate of 1200 ml min −1 . The effects of regeneration temperature and ramping rate on sorbent regeneration performance were demonstrated. The maximum sorbent regeneration efficiency of 97.2% was achieved under the regeneration condition of 110 °C and 5 °C min −1 . CO 2 sorption capacity of the amine-tethered sorbent kept stable within 5 repeated cycles. These findings indicate that the amine-tethered sorbent could be a good candidate for on-site CO 2 capture from flue gas in co-firing power plants.
研究领域:
能源与环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2024
·
IF 5.7
Tianyou Cui,Lianpeng Ge,Mengqian Zhao,Li Luo,Xuwei Long
Discovering new antibacterial agents is crucial to addressing the increasing risk of bacterial infections induced by antimicrobial resistance in food and agricultural industries. Here, biocompatible acidic-type sophorolipids (ASLs) and glucolipids (GLs) prepared via chemical modification of natural sophorolipids from fermentation were functionalized via amide modification for use as potential antibacterial agents. It was found that the arginine methyl ester derivative of GLs (GLs-d-Arg-OMe) showed excellent antibacterial activity, killing more than 99.99% of Escherichia coli at 200 mg/L. The sterilization dosage of the GLs against Bacillus subtilis, Bacillus cereus, and Staphylococcus aureus was 16–64 mg/L, in contrast to 32–64 mg/L for the fungus Candida albicans. In particular, GLs-d-Arg-OMe showed the best biocompatibility with a therapeutic index of up to 18. It was shown that amide modification of glycolipids can effectively improve antibacterial activity while maintaining biocompatibility, which can be exploited for the development of novel antibiotics in food and agricultural fields.
研究领域:
微生物学
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食品科学
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农业科学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Feifan Chen,Bo Zhang,Luxia Yin,Yongkang Lu,Wanhui Gong,Jianguang Gao,Zekai Zhang,Wensheng Ning
Amine-modified SiO2 hybrid aerogel desulfurization adsorbents with varied Si/N molar ratios (SiO2-NH2-n) were prepared via the sol–gel method followed by the atmospheric drying technique. SiO2-NH2-n aerogels were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), in situ Fourier transform infrared (FT-IR), and N2 adsorption–desorption. The desulfurization performances of SiO2-NH2-n were studied by the batch and breakthrough adsorption experiments. SiO2-NH2-n exhibited an obvious improvement in adsorption capacity for thiophenics compared with SiO2 aerogel due to the hydrogen bonding between thiophenics and amino groups. Among them, SiO2-NH2-8 had the best performance, and the adsorption capacities for thiophene, benzothiophene, and dibenzothiophene were 6.8, 9.5, and 10.2 mg S/gads, respectively. No effect of toluene and cyclohexene on the adsorption of SiO2-NH2-8 for thiophene was observed. The equilibrium adsorption data of SiO2-NH2-8 for thiophene were well fitted by the Freundlich model, indicating that multilayer adsorption occurred on the heterogenetic surface of SiO2-NH2-8. The kinetic adsorption data of SiO2-NH2-8 for thiophene could correlate properly with the pseudo-second-order kinetic model, suggesting that the rate-controlling steps involve surface adsorption. The saturated SiO2-NH2-8 could be regenerated completely via heating at 393 K for 12 h, and the regenerated SiO2-NH2-8 afforded 100% breakthrough adsorption capacity for thiophene.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Hanyang Liao,Ye Li,Haorui Li,Bolin Li,Yuzhi Zhou,Dongbin Liu,Xiaoli Wang
The amidoxime -modified X-type zeolite (AO-XZ) was successfully prepared by using X-type zeolite (XZ) as a carrier, iminodiacetonitrile (IDAN) as a nitrile-based precursor, and loading the amidoxime group onto the XZ. Mesoporous structure of XZ was unchanged after modification and the mechanism of adsorption is ion exchange. The adsorption behavior followed the pseudo-secondary kinetics, indicating that chemical adsorption is dominant. The Langmuir model had a good fitting effect (R 2 ≈ 0.9931), indicating that the adsorption process is dominated by single-layer uniform adsorption, and the maximum adsorption capacity of AO-XZ towards Cs + by Langmuir fitting was 222.2 mg/g. The process of Cs + adsorption by AO-XZ has high adsorption rate (greater than90%) under neutral conditions and common ion competition. Besides, in the dynamic experiment, the adsorption reached the point of failure after 14 h. The above results indicate that AO-XZ has good potential for removing Cs + from radioactive wastewater in future practical applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Chem Catalysis
·
2024
·
IF 11.5
Ji Wei Sun,Tingting Yu,Haoran Wu,Minghui Zhu,Aiping Chen,Cheng Lian,Hua Gui Yang,Peng Fei Liu
High cost of pure CO 2 feed constitutes a significant economic obstacle in industrial-scale CO 2 electrolysis. Direct CO 2 electrochemical conversion from flue gas has emerged as a promising strategy to reduce feed cost, while the O 2 in flue gas cannot be ignored due to its strong reactivity. Here, we achieved fast, selective CO electrosynthesis directly fed with simulated oxygen-containing flue gas (95% CO 2 +5% O 2 ) over the amine-confined Ag catalysts in a flow cell, among which dimethylamine-modified Ag exhibited 80.6% CO Faradaic efficiency with partial current density of 333.7 mA cm −2 . In situ spectroscopy demonstrated that dimethylamine confinement endows a robust CO 2 adsorption-conversion capacity. Theoretical calculations further elucidated that amine modification could not only mediate CO 2 adsorption and ∗COOH intermediate formation but could also block the ∗OOH intermediate pathway in the side reaction of oxygen reduction. These findings pave a new avenue for rational design of amine-confined electrocatalysts for direct flue gas conversion and utilization.
研究领域:
化学工程
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环境科学
·
电催化
✓ 已验证
DOI
高影响因子
Journal of Experimental Nanoscience
·
2016
·
IF 0.832
Yao Yu,Youshen Wu,JiaJun Liu,Yonghua Zhan,Daocheng Wu
Water-dispersible ultrasmall nanogolds (WDU AuNPs) and their dopamine-coated nanogolds (WDU AuNPs@DPAs) were prepared by a reduction method with sodium borohydride as a reducing agent and a stabilised agent of 2-mercaptosuccinic acid in aqueous solution. The effects of these nanoparticles on computed tomography (CT) imaging were evaluated. The size distributions and Zeta potential of the nanoparticles were measured with a Malvern size analyser, and nanoparticle morphology was observed by transmission electron microscopy. These characteristics were confirmed by Fourier transform spectroscopy and ultraviolet/visible spectra. It was found that WDU AuNPs@DPAs were 5.4 nm in size with clear core–shell structure. The 3-(4, 5-Dimethyl-2-thiazolyl)-2, 5-diphenyltetrazolium bromide assay results showed that the WDU AuNPs and WDU AuNPs@DPAs were hypotoxic to different cells. The WDU AuNPs@DPAs showed a much longer circulation time and a larger CT attenuation coefficient than iohexol and could be excreted by the kidney and bladder. These nanoparticles showed considerable potential for future application in CT imaging.
研究领域:
医学影像学
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纳米医学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 73
·68695-68704
·
IF 3.289
Yiming Ren,Ruizhu Yang,Lang Shao,Hao Tang,Shaofei Wang,Jianlong Zhao,Jingrong Zhong,Chuipeng Kong
Phosphoramide-modified ordered mesoporous silica (SBA-DEPA) materials were prepared via a two-step process involving: (1) the synthesis of phosphoramide via amidation of phosphoryl chloride with a primary amine and (2) modification of the phosphoramide onto SBA-15. The successful preparation was confirmed by FT-IR and NMR spectroscopy. As indicated by the ICP-AES and XRF analysis results, the phosphoramide group has a grafting ratio as high as 12.5%. The morphological information and N2 adsorption–desorption technique proved the highly ordered structure and large specific area of the material, respectively. An excellent performance for uranium sorption was found with a loading maximum of 311.6 mg g−1, a marked promotion relative to unmodified SBA-15. A strong pH and CO2 dependence suggested that near neutral conditions favored the maximum uranium sorption. To our surprise, the sorption took only 5 min to reach a 90% capacity and 20 min for equilibrium, which is extraordinary when compared to many other sorbent materials. The ionic strength partially influences the sorption, which indicates outer and inner sphere sorption both play parts in the process. A sorption capacity of over 90% of the original indicates the excellent reproducibility of SBA-DEPA. DFT calculations based on cluster models suggested a ‘tri-dentate-like’ structure for the uranyl-surface binding site, which may explain the excellent sorption ability of this material.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2021
·Vol. 28
·期 1
·140-152
·
IF 1.993
Zhengpeng Yu,Jingjing Zeng,Jingyuan Tang,Yu Li,Tingting Jin,Benlan Zeng,Xianhua Wei,Jingsong Liu,Linyu Pu,Xu Huang
Owing to their excellent dielectric properties and energy storage performance, polymer-based composites have shown great potential in the application of pulse energy storage capacitors and electrostatic capacitors. In this study, BaTiO 3 (BT) particles with different sizes were modified with dopamine to prepare core–shell structured BT particles (PDA@BT), and then the poly(arylene ether nitrile) (PEN)-based PDA@BT/PEN composites were prepared. As a common biological material, dopamine has a variety of functional groups which can be used to improve the compatibility between the fillers and the matrix. Moreover, the movement of the carriers at the interface of the composites is limited and the loss is reduced. The composites with an optimized filler size illustrate a high energy density of 1.37 J/cm 3 at 160 kV/mm, which nearly reaches up to the energy density of biaxially oriented polypropylene (BOPP) at low electric field. In addition, the composites have the superior power density of 1.88 MW/cm 3 with a fast discharge time of 0.138 μs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）