SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yingying You,Haiguang Yuan,Yixiao Wu,Yiyang Ma,Chenchen Meng,Xuesong Zhao
Using solar energy to reduce bromate in drinking water is promising. Unfortunately, most effective photocatalysts for bromate conversion are metal-based semiconductors. Here, for the first time, metal-free hybrid composites made of red phosphorus and perylene diimide (RP/PDI) were successfully designed and constructed, and their excellent catalytic performance for removing bromate under visible light was demonstrated. Characterizations such as XRD, FTIR, Raman, SEM and XPS confirmed the successful preparation of the hybrid catalyst, and the impact of water matrices suggests that it can be used for the actual treatment of bromate. The bromate reduction rate of the prepared RP/PDI-2 was 4.2 times and 7.0 times faster than pure RP and PDI, respectively. As evidenced by EIS and EPR results, this improvement is mainly due to the formation of p-n heterojunctions , which enhanced the separation of charge carriers and inhibited the production of active species ( O 2 − and OH) with strong oxidative capabilities. Considered holistically, the current study provides not only a metal-free photocatalyst with good photoreduction performance, but also some guidance for the rational design of hybrid photocatalyst in the treatment of aqueous bromate.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Chao Zhou,Chengju Sheng,Lingling Gao,Jia Guo,Peng Li,Bo Liu
The development of treatment of wound healing cannot meet clinical requirements owing to the complex bacteria-infection and inflammatory reaction. It is necessary to develop wound dressings that are fast antibacterial property, anti-inflammation and promoting cell migration and proliferation for shortening wound healing period. In this work, we first synthesized two poly(ionic liquids) (PILs): poly(1-ethyl-3-vinylimidazolium furan-2-carboxylate) (PEIF) and poly(1-butyl-3-vinylimidazolium furan-2-carboxylate) (PBIF). The PILs were then mixed with 5 wt% montmorillonite (MMT) clay and 2-furfurylamine-modified hyaluronic acid (HAF), and chemically crosslinked with four-arm maleimide-polyethylene glycol (Mal 4 PEG) to form degradable semi-inter penetrate network (semi-IPN) hydrogels. In vitro assays demonstrated that the synthesized semi-IPN hydrogels exhibited high antibacterial activities against Escherichia coli and Staphylococcus aureus due to the high antibacterial activity of PILs. Furthermore, the semi-IPN hydrogel could be quickly degraded, and the PILs exhibited high anti-inflammatory activities when they were released from degraded hydrogels. The degradation solutions of hydrogels contained glycosaminoglycan, which was beneficial to cell proliferation and migration. The in vivo anti-infection results further demonstrated that the semi-IPN hydrogels could kill S. aureus and accelerate the healing of infected wounds.
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Nanoscale
·
2021
·Vol. 13
·期 7
·4140-4150
·
IF 7.79
Yongjie Zhang,Ning Feng,Shujin Zhou,Xia Xin
Gold nanoclusters (AuNCs) are among the most promising organic–inorganic hybrid luminescent materials for various applications. The current development of AuNCs majorly focuses on controlling their luminescence properties. Herein, we report a new strategy to facilely construct two different nanocomposites featuring enhanced photoluminescence based on mercaptopropionic acid-protected AuNCs (MPA-AuNCs). Through co-assembly with Zn2+ and 2-methylimidazole (2M-IM), the weak luminescence of MPA-AuNCs evolved into either intense blue-green or orange emission at different concentration ratios of additives. HR-TEM and spectroscopic characterization studies revealed that the intense blue-green emission was ascribed to the formation of ZnS quantum dots (QDs) on the outer surface of AuNCs (AuNCs@ZnS), while the strong orange emission originated from the primitive MPA-AuNC core encapsulated by a cubic ZIF-8 shell (AuNCs@ZIF-8). The AuNCs@ZnS nanocomposite was further applied as an exceptional chemical sensor for selective detection of Pb2+ and Fe3+via different quenching mechanisms, and the AuNCs@ZIF-8 composite was applied for fabricating light-converting devices. The co-assembly of AuNCs with Zn2+ and imidazole derivatives provides a facile strategy for acquiring differentiated nanomaterials that have versatile potential applications in chemical detection and light-converting devices.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Wenjie Xiong,Mingzhen Shi,Lingling Peng,Xiaomin Zhang,Xingbang Hu,Youting Wu
CO 2 and H 2 S are considered impurities in natural gas that moderate the pace of environmental health. Developing highly efficient and cost-effective absorbents is of significance for sweetening natural gas. Herein, four superbase protic ionic liquids (SPILs) were prepared in this study. Typical physical properties (density, viscosity, and decomposition temperature) were also examined at ambient pressure. These SPILs show low viscosity values at ranging from 5.1 cP to 18.3 cP at 313.2 K. The solubility of H 2 S (0–1.0 bar), CO 2 (0–1.0 bar), and CH 4 (0–5.0 bar) was systematically measured at temperatures in the range of 298.2 K to 333.2 K. Impressively, the absolute solubility of H 2 S under 0.1 bar was found to be located at 4.31–5.15 mol/kg at 313.2 K, which is the highest value obtained among the reported results in the literature. The ideal selectivity of H 2 S/CH 4 and CO 2 /CH 4 (H 2 S or CO 2 solubility at 0.1 bar vs CH 4 solubility at 1 bar) at 313.2 K are in the ranges of 367–653 and 92.4–240, respectively. The interaction mechanism we explored was characterized by NMR and FT-IR spectroscopy. Thermodynamic parameters, such as enthalpy, Gibbs free energy, and entropy of dissolution were calculated from the temperature dependent solubility using the “deactivated model”. These SPILs are promising alternative candidates for the simultaneous removal of H 2 S and CO 2 in natural gas upgrading.
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ENERGY & FUELS
·
2020
·
IF 3.421
Minjie Gao,Yucui Hou,Qi Zhang,Ying Sun,Shuhang Ren,Weize Wu
In this work, we designed three kinds of functional deep eutectic solvents (DESs) to capture SO2 in simulated flue gas. The DESs were composed of imidazole (Im), 2-methylimidazole, and 2-ethylimidazole as the hydrogen-bond acceptor (HBA) and H2O as the hydrogen-bond donor (HBD). The absorption results showed that the mole absorption capacities of 2.1 vol % SO2 by the three DESs at 40 °C were all about 1 mol of SO2/mol of HBA. Im–H2O DES (nHBA/nHBD = 1:4) shows a mass absorption capacity of 0.331 g of SO2/g of DES, which is the highest value reported in the literature. The mole ratio of HBD/HBA, flow rate of flue gas, and other acid gases in flue gas did not influence the absorption capacity of SO2. The absorption capacity decreased when the temperature increased. The absorption capacity of SO2 was almost the same after absorbing and desorbing 5 times. Furthermore, the results of 1H nuclear magnetic resonance and Fourier transform infrared analyses showed that SO2 was interacted with Im by forming Im sulfite.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Guodong Ren,Xiaoyu Hou,Yu Kang,Rong Zhang,Min Zhang,Wen Liu,Lihong Li,Shuangyan Wei,Haojiang Wang,Bin Wang,Haipeng Diao
Herein, nitrogen-doped carbon dots (N-CDs) emitting blue fluorescence were prepared using L-tartaric acid and triethylenetetramine through a simple and quick microwave-assisted method. The synthesized N-CDs displayed excitation-dependent fluorescence behavior, and their maximum excitation and emission wavelengths were 350 and 425 nm, respectively. The obtained N-CDs, which featured excellent fluorescence properties with a high fluorescence quantum yield of 31%, were applied to detect metronidazole (MNZ), which can effectively quench the fluorescence intensity of N-CDs due to the inner filter effect. This phenomenon was used as basis to develop a label-free fluorescent method for rapid MNZ determination, with the limit of detection of 0.22 μM and corresponding linear range of 0.5–22 μM. Hence, we had established a fluorescence method for MNZ detection and applied it to detect MNZ in real samples with satisfactory results. Finally, N-CDs with superior biocompatibility were applied for cell imaging and MNZ detection by the changes in fluorescence intensity.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Dan Li,Yong Kang,Jie Li,Zongchi Wang,Zhinan Yan,Kai Sheng
As a successive work towards exploring suitable IL-based absorbents for SO 2 absorption from flue gas, we developed a species of new dicationic ionic liquids (DILs) with the combination of ether-functionalized dication and N-heterocyclic anions. These dual-functionalized DILs possessed high thermal stability, low vapour pressure, and high SO 2 capacity. The solubilities of SO 2 in the DILs increased with declining of the temperature and elevating of the SO 2 concentration. Notably, the available loading capacity of SO 2 in DIL 4 was up to 0.267 g SO 2 ·(g DIL) -1 at 313.2 K when the concentration of SO 2 in the feed gas was 2000 ppm, which was exceedingly significant for trapping SO 2 from the flue gas with low content of SO 2 . The regeneration experiments demonstrated that the absorption capacities of SO 2 in DIL 4 kept unchanged after six successive cycles of absorption/desorption. The absorption mechanisms based on the results of 1 H NMR, FTIR analysis and quantum chemical calculations indicated that both physical and chemical interactions between the SO 2 molecules and DIL 4 could be found in spite of different concentrations of SO 2 .
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Dawei Shang,Shaojuan Zeng,Xiangping Zhang,Xiaochun Zhang,Lu Bai,Haifeng Dong
Ammonia (NH 3 ) pollution poses a serious environmental threat. Ionic liquids (ILs) are regarded as potential solvents to treat NH 3 -containing gases because of their unique properties, including tunable structures and high affinity for NH 3 molecules. In order to achieve an efficient and reversible absorption of NH 3 , a series of protic ionic liquids (PILs) with multiple active sites were designed by introducing acidic protons, as well as the Li + ion into ILs, resulting in PILs with two acidic protons on cations ([2-Mim][NTf 2 ] and [Im][NTf 2 ]), as well as dual functionalised PILs with a Lewis acidic Li + -based anion and acidic protons on cations, namely, [2-Mim][Li(NTf 2 ) 2 ] and [Eim][Li(NTf 2 ) 2 ]. The NH 3 absorption capacity of [Im][NTf 2 ] was found to be 3.46 mol NH 3 /mol IL, which is the highest among the NH 3 absorption capacities of all known nonmetallic ILs, and is ascribed to the hydrogen bonding interactions between the NH 3 and PIL molecules. Furthermore, [2-Mim][Li(NTf 2 ) 2 ] exhibited the highest NH 3 absorption capacity, with a value of 7.01 mol NH 3 /mol IL, which is about 30 times higher than that of conventional ILs. The superior NH 3 absorption performance of the dual functionalised PILs is attributed to the combination of hydrogen bonding interactions between the protons and the NH 3 molecules, and the formation of coordination complexes between the Li + -based anion and the NH 3 molecules. Moreover, the ILs studied here exhibited excellent recyclability, indicating a great potential for their use in applications involving efficient and reversible NH 3 absorption from NH 3 -containing industrial gases.
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ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Ran Ma,Yu Zhao,Lan Liu,Zhenyu Zhu,Bo Wang,Ying Wang,Xijie Yin,Jing Su,Youping Zhou
Information about plant photosynthetic carbon assimilation, physiology, and biochemistry is locked in the 18O/16O ratios of the individual positions of higher plants carbohydrates but is under-utilized, because of the difficulty of making these determinations. We report the extension of the wet chemistry approach we used to access the 18O/16O ratio of O-3 of glucose with a novel GC/Pyrolysis/IRMS-based method, to determine the 18O/16O ratios of O-4, O-5, and O-6. The O atoms (OH groups) at positions 1, 2, 5, and 6 of glucose were protected by acetonation (converting to 1,2;5,6-di-O-isopropylidene-glucofuranose, DAGF). The DAGF was then converted to 6-bromo-6-deoxy-1,2;3,5-di-O-isopropylidene-glucofuranose (6-bromoDAGF) with the simultaneous removal of O-6 with N-bromosuccinimide and triphenylphosphine. The DAGF was also methylated at O-3 with CH3I under the catalysis of NaH to 3-methylDAGF, which was then deacetonated to 1,2-O-isopropylidene-3-O-methyl-glucofuranose (3-methylMAGF). O-5 and O-6 were then removed as a whole from 3-methylMAGF by I2 oxidization under the catalysis of Ph3P and imidazole. Isotope mass balance was then applied to calculate the 18O/16O of O-5 and O-6 as a whole and O-6, respectively. Sampling at different stages of substrate conversion to product and applying a Rayleigh-type fractionation model were employed, when quantitative conversion of substrate was unachievable to calculate the δ18O of the converted substrate. Quantitative conversion of glucose with phenylhydrazine to phenylglucosazone also allowed for the calculation of δ18O2 by applying isotope mass balance between the two. A C4 starch-derived glucose intramolecular δ18O profile is now determined: O-3 is relatively enriched (by 12.16 mUr), O-4 is relatively depleted (by 20.40–31.11 mUr), and O-2 is marginally enriched (by 2.40 mUr) against the molecular average.
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SYNTHETIC METALS
·
2020
·
IF 3.286
Wei Wang,Di Xu,Aibin Huang,Huihui Yuan,Junjie Xie,Xinyu Chen,Yunlong He,Tao Zhang,Hujiang Shen
PEDOT films were fabricated by vapor-phase polymerization (VPP) with different inhibitor contents in oxidant-containing solutions, and were characterized by X-ray diffraction, Raman spectroscopy, UV/vis transmittance spectra, atomic force microscopy, electrical conductivity and electrochromic measurements. The imidazole which serves as an inhibitor plays key roles on the polymerization reaction, and varying its content results in drastically different properties of the PEDOT films. In the imidazole/Fe(III) p -toluenesulfonate (Im/Fe) weight ratio range of 0∼0.25, the rate of polymerization can be significantly slowed down by increasing the Im/Fe ratio. The optimum Im/Fe ratio of 0.1 and polymerization time of 3 h results in PEDOT films with the highest conductivity on glass substrate (626 S/cm). Higher doping level is found in PEDOT films fabricated with the Im/Fe ratio above 0.1, causing low conductivity due to their loose morphology. The electrochromic properties of the films can be enhanced by prolonging the polymerization time to 3 h. It is found that the transmittance difference at 550 nm is above 10 % in PEDOT films fabricated with 3 h of polymerization. An electrochromic device is assembled and its coloring time is less than 3 s.
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AICHE JOURNAL
·
2020
·Vol. 66
·期 8
·e16253
·
IF 3.519
Yongkang Cao,Xiangping Zhang,Shaojuan Zeng,Yanrong Liu,Haifeng Dong,Chun Deng
The emerging of ionic liquids (ILs) provides an efficient and sustainable way to separate and recover NH 3 due to their unique properties. However, the solid or highly viscous ILs are not suitable for traditional scrubbing. Therefore, an effective strategy was proposed by combining the protic ILs (PILs) with acidic H and low viscous ethylene glycol (EG) to form IL-based deep eutectic solvents (DESs) for NH 3 absorption. The results indicated that these PIL-based DESs not only have fast absorption rate, but also exhibit exceptional NH 3 capacity and excellent recyclability. The highest mass capacity of 211 mg NH 3 /g DES was achieved by [Im][NO 3 ]/EG with molar ratio of 1:3, and was higher than all the reported ILs and IL-based DESs, which was originated from multiple hydrogen bonding between acidic H and hydroxyl groups of the DESs and NH 3 . This work will provide useful idea for designing IL-based solvents for NH 3 separation applications.
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TALANTA
·
2019
·
IF 4.916
Nadia A. Samak,Mohamed S. Selim,Zhifeng Hao,Jianmin Xing
Hydrogen sulfide (H 2 S) is a toxic environmental pollutant and crucial gas-signaling agent of human physiology. There is an urgent need for developing a sensitive and selective detection approach for H 2 S. Herein, a novel turn off/on response approach using γ-Al 2 O 3 nanorods anchored on the surface graphene oxide (GO) nanosheets and coupled with DNA/sulfide fluorophore (SF) for H 2 S detection at room temperature was developed. The fluorescent fluorophore, DNA/SF, remains quenched on the super quencher γ-Al 2 O 3 –GO hybrid surface. In the existence of H 2 S, DNA/SF fluorophore was detached from γ-Al 2 O 3 –GO hybrid surface because of the strong physical adsorption interaction between H 2 S molecules and γ-Al 2 O 3 –GO surface. The recovered fluorescence intensity gave direct insight about H 2 S concentration in the medium. The developed γ-Al 2 O 3 –GO/DNA/SF nanobiosensor shows high sensitivity with 75 to 2.5 μM linear detection range of H 2 S, and a high binding constant of 9.8 × 10 3 M −1 . The nanobiosensor is very selective toward H 2 S in the presence of various interfering anions and thiols and used for H 2 S detection in real water samples. γ-Al 2 O 3 –GO/DNA/SF nanobiosensor provides a cheap, simple, and highly selective H 2 S detection method at room temperature.
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