BIOMACROMOLECULES
·
2021
·
IF 6.988
Shuai Zhu,Ruizhong Xue,Zikun Yu,Xu Zhang,Shifang Luan,Haoyu Tang
Poly(l-cysteine)s with methylthio pendants (PMTLCs) were synthesized by ring-opening polymerization of a new l-cysteine-based N-carboxyanhydride. The thioether bonds of PMTLC can be readily oxidized by H2O2 yielding water-soluble PMTLCOX. The methylthio groups can undergo an alkylation reaction using methyl iodide and a subsequent ion-exchange reaction yielding sulfonium-based polypeptides (PPLC-DMS-X, where X = I, BF4). PPLC-DMS-X showed upper critical solution temperature-type thermo- and oxidation-responsive properties in aqueous solutions. Both PMTLC and PPLC-DMS-X showed oxidation-induced β-sheet to α-helix transitions. The absorbance of PPLC-DMS-I and methyl orange aqueous solution displayed a significant linear correlation with temperature, which makes the sulfonium-based polypeptides good candidates in the field of temperature sensors.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Shuangjie Sun,Yameng Wang,Binbin Sun,Feifei Zhang,Qing Xu,Hao-Yang Mi,Heng Li,Xiaoming Tao,Zhanhu Guo,Chuntai Liu,Changyu Shen
Solar steam generation is an efficient way of harvesting solar energy for water purification. Developing a versatile solar absorber with salt resistance and the capability to purify an oil-in-water emulsion is a grand challenge. Herein, a polypropylene (PP) nonwoven fabric-based photothermal absorber is fabricated by the combination of carbon nanotubes (CNTs), polypyrrole (PPy), and a fluorinated hydrophobic coating in a layer-by-layer approach. The specially designed architecture displays a hierarchical microstructure and Janus wetting properties, facilitating solar absorption and heat generation on the evaporation surface, and can effectively prevent salt crystallization. The water layer formed on the superhydrophilic/underwater superoleophobic bottom surface could repel oil droplets and form a channel to advect concentrated salt back into bulk water, which enabled high purity separation of an oil-in-water emulsion and continuous desalinization of seawater without the reduction of the evaporation rate. As a result, the solar absorber can achieve a remarkable evaporation rate of 1.61 kg m–2 h–1 and an energy efficiency of 91.2% under 1 sun irradiation and shows extraordinary performance in the purification of contaminated wastewater (over 99.8% purity). The strategy proposed provides a pathway for developing versatile high-performance solar absorbers for the sustainable treatment of saline water, wastewater, and oil-containing water.
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高影响因子
Nano Research
·
2020
·Vol. 14
·期 3
·646-653
·
IF 8.183
Jiao Handong,Jiao Shuqiang,Song Wei-Li,Xiao Xiang,She Dongmei,Li Na,Chen Haosen,Tu Jiguo,Wang Mingyong,Fang Daining
Rechargeable Al-ion batteries (AIBs) are considered as one of the most fascinating energy storage systems due to abundant Al resource and low cost. However, the cycling stability is subjected to critical problems for using Al foil as negative electrode, including Al dendrites, corrosion and pulverization. For addressing these problems, here a lightweight self-supporting N-doped carbon rod array (NCRA) is demonstrated for a long-life negative electrode in AIBs. Experimental analysis and first-principle calculations reveal the storage mechanism involving the induced deposition of N-containing function groups to Al as well as the ideal skeleton of the NCRA matrix for Al plating/stripping, which is favorable for regulating Al nucleation and suppressing dendrites growth. Compared with the Al foil, the NCRA exhibits lower areal mass density (∼ 72% of Al foil), smaller thickness (40% of Al foil), but much longer cycle life (> 4 times of Al foil). Benefiting from the remarkable stability of the array structure, symmetric cells show excellent cycling stability with small voltage hysteresis (∼ 80 mV) and meanwhile there are no corrosion and pulverization problems even after cycled for 120 hours. Besides, full cells also manifest long lifespan (1,500 cycles) and increased Coulombic efficiency (100±1%).
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yinli Liu,Jie Jia,Tingting Gao,Xueli Wang,Jianyong Yu,Dequn Wu,Faxue Li
Novel nanofibrous membranes with outstanding adsorption property and high durability were fabricated by chemically immobilizing carboxymethyl-β-cyclodextrin polymers on the surfaces of biodegradable poly((butylene succinate-co-terephthalate)-co-serinol terephthalate) nanofibrous membranes via the amidation reaction. As an ecofriendly adsorbent, the resulting nanofibrous membranes presented rapid adsorption toward methylene blue (MB) dye with a removal efficiency of about 90% within 30 s and had the maximum adsorption capacity of 1030.9 mg/g to it. The thermodynamic parameters indicated that the adsorption process of the adsorbent to MB dye was endothermic and spontaneous. Selective adsorption was another advantage to the adsorbent, which showed preferable adsorption to cationic dye MB rather than anionic dye methyl orange with a separation efficiency of 99.9% to them. Inspiringly, the removal efficiency and mechanical properties of the adsorbent hardly changed after 20 regeneration cycles, indicating its good regeneration and high durability in treating the dye-containing wastewater.
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Nanoscale
·
2020
·Vol. 12
·期 30
·16245-16252
·
IF 6.895
Huiyu Jiang,Junfeng Li,Zhiheng Xiao,Bo Wang,Mingzhao Fan,Siqi Xu,Jun Wan
Transition metal carbides (TMCs) have attracted great interest owing to their potential applications for energy storage and electrocatalysis. But the synthesis of high-quality TMCs usually needs high energy consumption, long reaction times, or dangerous chemical reagents, limiting their practical application. Here, a microwave combustion method is developed to rapidly (∼2 min) produce transition metal carbides under ambient conditions. The as-synthesized TMCs (W2C, VC, Fe3C, NbC, TaC, and Mo2C) and rGO composites exhibit outstanding catalytic performance for the hydrogen evolution reaction (HER) over a broad range of pH values. This work highlights a novel strategy for the design and synthesis of transition metal carbides.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 45
·期 6
·3541-3556
·
IF 2.064
Qin Qingdong,Xu Jian,Sun Tian,Xu Yan
Bimetallic Fe 0 -based catalysts have been shown to be effective heterogeneous catalysts for elimination of organic pollutants by activating persulfate (PS). In this study, copper ferrite (CuFe 2 O 4 ) was isothermally treated under a reducing atmosphere in order to load Fe 0 /Cu 0 bimetallic nanoparticles on the surface of CuFe 2 O 4 . The reduced CuFe 2 O 4 was then used as a magnetically separable catalyst for PS activation to remove methyl orange (MO) from aqueous solution. The experimental data followed well the pseudo-first-order kinetic model, and the reaction rate of the reduced CuFe 2 O 4 /PS system was 5.6 times greater than that of the CuFe 2 O 4 /PS system. The key operating parameters such as PS concentration, catalyst dosage and solution pH were investigated. Catalyst stability of reduced CuFe 2 O 4 was also tested by consecutive reuse cycles. Quenching experiments and electron spin resonance (ESR) spectroscopy revealed that the main reactive species was sulfate radical (SO
·− 4
). Intermediate products of MO degradation were determined by high performance liquid chromatography coupled with a high-resolution hybrid quadrupole time-of-flight mass spectrometer (LC-Q-TOF–MS) and the MO degradation pathways were proposed. Based on the analysis of catalytic activity and surface characteristics of reduced CuFe 2 O 4 , the enhanced reactivity of reduced CuFe 2 O 4 was mainly attributed to rapid corrosion of Fe 0 /Cu 0 bimetallic nanoparticles by PS. These findings illustrated that the reduced CuFe 2 O 4 /PS system may be an efficient technology for MO removal from wastewaters.
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高影响因子
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
·
2020
·Vol. 41
·期 5
·552-557
·
IF 0.611
Shan Li,Zhongping Chen,Datong Wu,Yong Qin,Yong Kong
A novel composite of graphene quantum dots functionalized Sb 2 WO 6 (GQDs/Sb 2 WO 6 ) was prepared by an electrostatic self-assembly method and used as a photocatalyst for the degradation of an organic pollutant. The resulting GQDs/Sb 2 WO 6 was characterized by electron microscopy and optical measurements. The photocatalytic activity of GQDs/Sb 2 WO 6 was investigated by degrading methyl orange (MO) under UV-light and visible-light irradiation. Compared with pure Sb 2 WO 6 , enhancement of the photocatalytic performance of GQDs/Sb 2 WO 6 was achieved, and the degradation efficiency for MO was almost 100% within 3 h under UV-light irradiation and 71.4% within 3 h under visible-light irradiation. The photocatalytic degradation mechanism of GQDs/Sb 2 WO 6 was illustrated by free radical and hole scavenging experiments, and the main active species were confirmed to be holes (h + ) and superoxide anion radicals (O 2 · − ). Moreover, the GQDs/Sb 2 WO 6 composites exhibited high recyclability and stability and had potential application for decomposing other organic contaminants in water.
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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Shuangshuang Lin,Haiming Hua,Jiyang Li,Peng Zhang,Jinbao Zhao
We have found that the formation of passivation film plays a major role in the negative shift of the decomposition voltage in the hydrogen-generating process. Both the hydrolysis of weak acid ions and the decarboxylation reaction of carboxylate can make the LiCO 2 CH 3 produce a passivation film to inhibit the water decomposition to a certain extent. As for the LiCO 2 CF 3 without hydrolysis of weak acid ion, it can be highly possible to facilitate the introduction of CO 2 via its carboxylate specific decarboxylation reaction, and further produce lithium carbonate passivation film as well. However, the water decomposition voltage in the oxygen-producing process is more dependent on the properties of lithium salt anions. Those with strong electron-absorbing groups such as the trifluoromethyl are more likely to effectively endue the aqueous electrolyte with a high oxidative decomposition potential . Moreover, the concentration of LiCO 2 CF 3 aqueous electrolyte can reach up to 28 mol kg −1 , and hence the electrochemical stability window of this water-base electrolyte can be expanded to about 3.0 V. This work provides a new idea for the selection of high concentration lithium salt.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xiaoming Wang,Qianqian Peng,Xilin Zhang,Xucheng Lv,Xin Wang,Yongzhu Fu
Refractory high-entropy alloy nanocomposites (HEA-NPs) are important class of materials with unique structure and potential applications. Although several synthetic methods have been reported, developing novel routes to prepare nanoscale HEA-based catalysts facilely is still urgently desired. This work takes advantage of confinement assisted arc and plasma shock (APS) to prepare a series of HEA-NPs by regulating the type and proportion of metal precursors. The phase constitutes and morphology of the HEA-NPs are fully characterized. The prepared refractory HEA-NPs possesses five highly dispersed metal components, including titanium (Ti), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo) and simultaneously exhibits an uniform hexagonal morphology of nanocrystals . By taking advantage of its unique corrosion resistance , TiNbTaCrMo HEA-NPs can function as a promising candidate for electrocatalytic hydrogen evolution reaction (HER) in natural seawater . And its catalytic performance after alloying is significantly enhanced compared with the elemental metal. Theoretically, the promoted HER activity can be attributed to the strong adsorption for the various metal components in HEA-NPs caused by the upshifting d -band center close to the Fermi level . Furthermore, this confinement strategy can be further extended to synthesize other HEA-NPs. Our strategy provides a novel method to synthesize various HEA-NPs for further catalytic application.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yu Li,Yong Feng,Bin Yang,Zequn Yang,Kaimin Shih
The activation of persulfate by ferrous iron (Fe(II)) is of great interest to the environmental remediation community, but the reduction of ferric iron (Fe(III)) to Fe(II) is slow and the accumulation of iron sludge resulted from the precipitation of Fe(III) is a great concern. Here, molybdenum disulfide (MoS 2 ) was studied as a co-catalyst to improve the activation of peroxymonosulfate (PMS) by Fe(III) for sulfadiazine (SDZ) degradation and different characterization technologies were used to reveal the reactive species. The results showed that a strong synergy existed between MoS 2 and Fe(III); approximately 94.3% of the SDZ was removed by MoS 2 -Fe(III)-PMS after reaction for 30 min, while only 8.5% and 56.4% of the SDZ was removed by Fe(III)-PMS and MoS 2 -PMS, respectively. Both hydroxyl radicals and sulfate radicals were generated and the latter was the primary species. In addition to the radicals, singlet oxygen was found to be generated and contributed to the degradation of SDZ. The chemical probe reaction with methyl phenyl sulfoxide showed that the generation of high-valent iron-oxo species was not obvious by MoS 2 -Fe(III)-PMS under both acidic and neutral conditions. MoS 2 had good stability. No noticeable deactivation was observed during the 1st to 5th run and no obvious oxidation of surface Mo(IV) occurred. Based on the characterization of catalyst and oxidizing species, a mechanism for the activation of PMS by MoS 2 -Fe(III) was proposed. The results from this study are expected to clarify the reactive species and deepen the understanding of MoS 2 -promoted persulfate activation by Fe(II)/Fe(III).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Pingping Yang,Xuejiao Hu,Yizhou Tu,Guizhou Xu,Lin Sun,Xianchuan Xie
Organic micropollutant in the aquatic environment has become a worldwide problem. In this study, a new DMpillar[5]arene-based porous organic polymer (DMPBP[5]) with the highest surface area of 1347.4 ± 39.3 m 2 g −1 is developed through Friedel-Crafts alkylation reaction between DMpillar[5]arene (DMP5) and 4,4′-bis(chloromethyl)-1,1′-biphenyl (BCMBP) to remove a wide range of organic micropollutants with fast removal rate and large uptake amounts. The synthesized DMPBP[5] can capture many types of organic pollutants in water including positively charged, negatively charged and neutral ones and those with different hydrophilicity, through host–guest interaction, hydrophobic interaction, electrostatic interaction and π-π interaction. For some pollutants, the adsorption kinetic constants of DMPBP[5] are thousands of times larger than that of activated carbon (AC) and even 10 4 -10 5 times larger than that of resin (XAD-4), and the adsorption capacities of DMPBP[5] are about 3 and 4 times higher than that of AC and XAD-4, respectively. The superior adsorption performance of DMPBP[5] is attributed to permanent porosity and accessible binding sites because of the introduction of rigid structure. Even at environmentally relevant concentrations, DMPBP[5] can quickly remove the pollutants simultaneously and can be easily regenerated with methanol under ambient conditions. In short, due to the wide adsorption range, excellent adsorption performance, and easy recyclability, DMPBP[5] is an excellent adsorbent for wastewater treatment with great application potential.
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MATERIALS & DESIGN
·
2019
·
IF 5.77
Peng Xu,Jin Yang,Yu Chen,Yong Li,Xiaohua Jia,Haojie Song
The removal of emulsified oil and organic dyes from wastewater is of extreme challenge owing to their difference of physical and chemical properties. Here we choose cellulose fibers derived from wood as supporting materials and the irregular flake-like BiOBr and sphere-like AgBr are in situ grown on the fibers via freeze-drying, which successfully create wood-derived fiber/BiOBr/AgBr (WFBA) sponge for wastewater treatment. The obtained WFBA sponge reveals favorable mechanical strength at a strain of 60% and 50 cycles of compression tests. In view of the superhydrophilicity and underwater superoleophobicity of WFBA sponge, it can be used for separating surfactant-stabilized kerosene-in-water emulsions with oil rejection ration higher than 99.91%, and simultaneously adsorbing organic dyes with removal efficiency >99.99%. Furthermore, the polluted WFBA sponge is capable of realizing dye degradation under Xe lamp, solar light and fluorescent lamp due to its enhanced photocatalytic activity. Thus, the regenerated sponge can take full advantage of functionalities of emulsion separation and dye adsorption, as presented by that the oil rejection ration still keeps as high as 98.23% and removal dye efficiency remained over 99.90% after five cycles of filtration. This study provides a feasible and scalable approach to engineer versatile materials for wastewater treatment.
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