Advanced Energy Materials
·
2021
·Vol. 11
·期 33
·2101156
·
IF 29.368
Ding-Rong Deng,Ru-Ming Yuan,Pei-Kai Yu,Fei Xue,Xiao-Xiang Fan,Jie Lei,Jie-Ling Zhang,Xiao-Dong Lin,Qi-Hui Wu,Jing-Min Fan,Jeng-Kuei Chang,Wen-Jing Hong,Ming-Sen Zheng,Quan-Feng Dong
An electron conductive matrix, or collector, facilitates electron transport in an electrochemical device. It is stationary and does not change during the entire operation once it is built. The interface of this matrix and an electrode is constructed at a 2D level at the micro-scale, and naturally limits the breadth and depth of electrochemical reactions. Herein, the idea of an enhanced electrode coupled with a conducting molecule that can extend interfacial reactions is first introduced. With a spatialized interspace, this electrode can change the present understanding of the electrode process and opens up a new realm of electrode-based reaction chemistry. A lithium–sulfur (Li–S) battery is used as the target for implementing the enhanced electrode owing to the complex multi-electron reaction. Through the interaction of π–π stacking between graphite-based carbon and iron (II) phthalocyanine (FePc), soluble FePc can be decorated on the surface of an electrode that has the capability of transporting electrons. The scanning tunneling microscope break junction characterization and density functional theory indicate that FePc has a strong molecular electronic conductivity. The reactants obtain electrons more easily from the conducting molecule than from the collector directly. As a result, the performance of the corresponding Li–S battery considerably improves.
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Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 29
·5861-5868
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IF 6.331
Chen Yuan,Shue Jin,Jiawei Wei,Jinhui Huang,Chang Liu,Xiaoyu Lei,Yi Zuo,Jidong Li,Yubao Li
The deformation shrinkage of a poly(lactide-co-glycolide) (PLGA) fibrous material seriously affects its biomedical application. To demonstrate the underlying shrinking mechanism and to find a method to prevent the shrinkage of an electrospun PLGA membrane, we investigated the shrinking behavior of PLGA electrospun membranes under various test conditions and discussed the underlying shrinking mechanism. The results indicated that the shrinkage of the electrospun PLGA membrane was mainly regulated by the glass transition of its polymer fiber; the temperature and liquid environment were found to be the two main factors leading to the shrinkage of the electrospun PLGA membrane through affecting its glass transition. Then a heat stretching (HS) technique was proposed by us to stabilize the electrospun PLGA membrane. After HS treatment, the glass transition temperature (Tg) of the electrospun PLGA membrane could increase from 48.38 °C to 54.55 °C. Our results indicated that the HS-treated membranes could maintain a high area percentage of 90.89 ± 2.27% and 84.78 ± 3.36% after immersion respectively in PBS and blood at 37 °C for 2 hours. Further experiments confirmed that the HS technique could also stabilize the dimensional structure of the electrospun PDLLA membrane in PBS and blood at 37 °C. This study provides an effective strategy for preventing the shrinkage of electrospun polyester biomaterials in a physiological environment that may benefit both the material structural stability and the in vivo biological performance.
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 9
·1-9
·
IF 5.833
Gao Rongwei,Yang Xuelian,Yang Qiuju,Wu Yuanke,Wang Feng,Xia Qingyou,Bao Shu-Juan
Enzymes have demonstrated great potential in the development of advanced electroanalysis devices due to their unique recognition and catalytic properties. However, unsatisfactory stability and limited electron communication of traditional enzyme sensors seriously hinder their large-scale application. In this work, a simple and effective method is proposed to improve the stability of enzyme sensors by using sodium hyaluronate (SH) as a protective film, MXene-Ti 3 C 2 /Glucose oxidase (GOD) as the reaction layer, and chitosan (CS) /reduced graphene oxide (rGO) as the adhesion layer. Results demonstrate that the repeatability of the designed sensor increased by 73.3% after improving the adhesion between the reaction layer and the current collector and that its response ability was greatly enhanced. Moreover, the long-term stability of the electrode surface with SH protective film proved to be superior than that without protective film, which suggests that this design can effectively improve the overall performance of the enzyme biosensor. This work proposed a multi-tier synergistic approach for improving the reliability of enzyme sensors.
Our proposed protective and adhesion layer can greatly improve the stability of enzyme sensor and realize the rapid detection of glucose in serum sample.
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Haibo Li,Haojun Li,Zhennan Zhou,Hua Tong,Bei Long,Wei Liu,Weihua Li
The improvements of light absorption , charge separation and conductivity are the most common methods to enhance the degradation performance of photocatalysts. But the enhancement of hydrophily of photocatalyst is equally important and the designed approach is rarely reported. Here, a simple method to introduce hydrophilic hydroxyl (-OH) on BiOI is proposed by adding citric acid into the reactive system. Further, the conductive metal Bi is grown on BiOI by in-situ reduction. Benefiting from the elevated hydrophily, specific surface area, conductivity and photoinduced carrier separation efficiency, the optimized catalyst shows the outstanding photodegradation of methyl blue and tetracycline hydrochloride (both >90% removal ratio in 15 min). This work opens up a new way to design the high-performance photocatalyst.
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Journal of Cleaner Production
·
2021
·
IF 9.297
Maocai Shen,Zhuotong Zeng,Long Li,Biao Song,Chengyun Zhou,Guangming Zeng,Yaxin Zhang,Rong Xiao
As an important contributor of environmental microplastics , wastewater treatment plants have attracted extensive attention. The negative effect of suspended particulate matter on disinfection effect has also been established. The main aims of this study were to understand the potential effects of granular polyethylene microplastic and fibrous polyamide microplastics on ultraviolet and chlorine disinfection in water/wastewater treatment. In the laboratory, microplastics were exposed to different disinfection methods, which represented the disinfection dose and disinfection conditions of real water and wastewater treatment. Escherichia coli (8099) were selected as the experimental object. Microplastic suspended solids were closely related to water turbidity and UV transmittance at 254 nm. The occurrence of microplastics significantly reduced the efficiency of ultraviolet and chlorine disinfection in water/wastewater treatment, and the efficiency decreased with the increase of microplastics concentration or the decrease of disinfectant dosage. When the concentration of microplastics reached a certain level (>50 mg L −1 ), even if the exposure dose continued to increase, the disinfection efficiency could not be improved. Microplastics can reduce the concentration of disinfectants around them by reacting with disinfectants, thus protecting the microorganisms enriched on the surface of microplastics. Although the harsh conditions tested here are rarely met in a typical water treatment process, it represented a worse result. These results were intended to be used by water treatment plants to predict the effects of microplastics in the secondary effluent on UV and chlorine disinfection processes .
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Wuzhi Yuan,Zhixing Liao,Kui He,Quanbing Liu,Si-Min Huang
The self-cleaning of the superhydrophobic surface (SHS) attracted worldwide interest. However, in most cases it depends on the incoming droplet, which places additional constraints especially in arid area and/or narrow space. Herein, a condensation-induced self-cleaning of dust on the SHS is proposed. First, the SHS are prepared and dust is deposited on the surface, and then the dust removal process is studied on the condensation visualization platform. During condensation, a liquid bridge is initially formed at the contact points between particles on the SHS, which governs dust removal behavior. Specially, three consecutive processes are accounted for the self-cleaning including dust agglomerating, condensate sliding and rolling as the condensate prolongs. As far as the sizes and coverage rate of dust particles are concerned, over 95% of particles can be removed by condensation within 90 min (air temperature 26 ± 0.5 ℃, air humidity 60 ± 5% and cooling-stage temperature 10 ± 0.5 ℃). This study aims to provide a useful, in-depth understanding of dust mitigation by condensation on SHS, which has potential application in PV module and heat exchanger.
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高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Bin Hu,Wen-luan Xie,Yang Li,Zhen-xi Zhang,Ji Liu,Bing Zhang,Ti-peng Wang,Qiang Lu
The lignin pyrolysis process involves complex interaction reactions, where the bimolecular concerted interactions have been rarely studied. In the present work, an extended concerted interaction mechanism, hydroxyl-assisted hydrogen transfer (hydroxyl-AHT), was proposed based on the pyrolysis of the typical nonsubstituted and α-hydroxyl-substituted β-O-4 type lignin models (2-phenylethyl phenyl ether, PPE, and 2-phenoxy-1-phenylethanol, α-OH-PPE). This hydroxyl-AHT mechanism was investigated and confirmed with the combined fast pyrolysis experiments and quantum chemistry modeling. The results indicate that phenolic, watery, alcoholic, and enolic hydroxy compounds all can act as mediators for the concerted hydrogen transfer process in lignin pyrolysis and have similar assistant effects. Whereas, the hydroxyl-AHT has a great influence on the competitiveness of different concerted reactions to break the Cβ–O, Cα–Cβ, and Cα–OH bonds, respectively. To compare the pyrolysis of PPE and α-OH-PPE, the α-hydroxyl substituent leads to a significant promotion to the Cβ–O cleavage based on hydroxyl-AHT because there are more hydroxyl mediators and more concerted reaction types that can be involved in the bimolecular hydrogen transfer in α-OH-PPE pyrolysis. Hence, more phenol derived from the Cβ–O breakage was detected in the pyrolysis experiment of α-OH-PPE than that of PPE. In addition, this bimolecular hydroxyl-AHT interaction mechanism is universal in the concerted pyrolysis processes of lignin, also accelerating the cleavage of α-O-4 linkage, β-1 linkage, etc.
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高影响因子
Reaction Chemistry & Engineering
·
2021
·Vol. 6
·期 12
·2259-2265
·
IF 4.239
Zhou Lan,Yangcheng Lu
A strategy of dissolving chlorine gas in 1,2-dichloroethane as the chlorine source for a liquid–liquid two-phase chlorination reaction was proposed in this study to resolve the problems of low efficiency, strong corrosivity, and poor controllability of traditional gas–liquid chlorination. Taking the chlorination reaction of 4-nitroaniline to synthesize 2,6-dichloro-4-nitroaniline as an example, the feasibility of the liquid–liquid chlorination method was verified in a microflow system. It can achieve 98.3% conversion and 90.6% selectivity within 1.6 s under the optimized reaction conditions. The recycling of HCl and 1,2-dichloroethane solvents was facile, and after three runs of recycling the chlorination reaction can still maintain good conversion and selectivity. The influence of feed mixing and the reaction networks on chlorination of 4-nitroaniline were also explored as a guide for process design. Compared with the traditional gas–liquid chlorination, the reaction efficiency of liquid–liquid two-phase chlorination is greatly improved, and it has a prospect for industrial application in terms of safety and controllability.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Qingfan Ren,Peipei Yang,Jiamin Liu,Yuying Chen,Sixue Ouyang,Ying Zeng,Peng Zhao,Jia Tao
Lanthanide-functionalized porous organic materials have been the promising candidates in the chemical and biological sensing. Considering the superior thermal and solvent stability of covalent organic frameworks (COFs), the development of lanthanide ions-functionalized COFs based sensing platform is meaningful, while remains to be a challenge. In this work, a new imine-linked COF which provides suitable coordination sites for Tb 3+ was constructed via the Schiff base reaction between P-phenylenediamine (Pda) and 2,6-Diformylpyridine (Dfp). Benefiting from its high signal-to-noise, the [email protected] shows excellent ability to determinate ciprofloxacin (CIP) with a detection limit of 3.01 nM. The measurement can maintain good stability in the presence of potential interference or in actual sample. Being washed with ethanol after each measurement, [email protected] can be recycled for five times. This work provides a novel alternative strategy for efficient construction of lanthanide-grafted COFs and may promote the development of porous organic materials based chemical sensing.
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高影响因子
Catalysts
·
2021
·Vol. 11
·期 11
·1274
·
IF 4.146
Ken-Lin Chang,Chun-Hung Liu,Paripok Phitsuwan,Khanok Ratanakhanokchai,Yung-Chang Lin,Cheng-Di Dong,Ming-Hsun Lin,Gordon C. C. Yang
Fungal delignification can be a feasible process to pretreat biomass for bioethanol production if its performance is improved in terms of efficiency through a few modifications. The aim of this study was to enhance the biodelignification pretreatment of rice straw using laccase in the presence of ionic liquid (1-Allyl-3-methylimidazolium chloride, [AMIM]Cl) or surfactant (TritonX-100). Addition of 750 mg/L [AMIM]Cl and 500 mg/L TritonX-100 increases the lignin removal to 18.49% and 31.79%, which is higher than that of laccase only (11.97%). The enzymatic saccharification process was carried out based on different strategies. The highest cellulose conversion, 40.96%, 38.24%, and 37.91%, was obtained after 72 h of enzymatic saccharification when the substrate was washed with distilled water after pretreatment of rice straw with laccase + TritonX-100, laccase + [AMIM]Cl, and laccase only, respectively. In addition, the morphology and structure changes of pretreated and untreated rice straw were studied. Both surface area and cellulose crystallinity are substantially altered after laccase + [AMIM]Cl and laccase + TritonX-100 pretreatment. Enhanced saccharification efficiency of rice straw was achieved by laccase pretreatment with ionic liquid or surfactant in a single system.Keywords:laccase;ionic liquid;surfactant;pretreatment;biomass;delignification
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chaoqun Ma,Da Liu,Yanli Zhang,Jin Yong Lee,Jian Tian,Bingping Liu,Shihai Yan
Electrochemical ammonia synthesis (EAS) is considered to be an ecofriendly and sustainable method for artificial N 2 fixation. It is urgent to develop cost-effective and efficient electrocatalysts for EAS because present catalysts have low activity and poor selectivity. Herein, Fe 2 O 3 nanoparticles anchored on MoS 2 nanoflowers (Fe 2 O 3 @MoS 2 ) were developed as a highly efficient EAS electrocatalyst under ambient conditions. Electrochemical measurements indicate that Fe 2 O 3 @MoS 2 achieves a remarkable NH 3 yield of 112.15 μg h −1 mg cat −1 at − 0.6 V vs. reversible hydrogen electrode (RHE) and a high faradaic efficiency (FE) of 8.62% at − 0.4 V vs. RHE in 0.1 M Na 2 SO 4 , much better than the EAS performance of separate MoS 2 and Fe 2 O 3 . The superior electrochemical stability is confirmed by long-term (at least 24 h) continuous tests. Density functional theory (DFT) calculations show that Fe 2 O 3 @MoS 2 , compared to MoS 2 , is better able to activate inert N 2 molecules, as reflected by its greater adsorption energy (−0.32 eV vs. − 0.10 eV), greater N≡N bond distance (1.223 Å vs. 1.159 Å), lower energy barrier (0.40 eV vs. 0.78 eV), and greater charge transfer from active sites to N 2 molecules (1.16 e − vs. 0.62 e − ). Thus, this work provides new perspectives on the development of efficient EAS catalysts using MoS 2 -based materials as the substrate.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Rui Jia Liu,Ling Xu Yang,Ying Wang,Hui Jun Liu,Chao Liu Zeng
Vanadium-based MXenes are prospective as anode materials in energy-storage devices including lithium-ion batteries (LIBs) but limited by their charge-discharge capacities. Herein, partially-etched V 2 Al x CT z with the average particle size of ~400 nm was synthesized using 40 wt% HF or mixed NaF+HCl solutions as etchants, respectively. V 2 Al x CT z etched by 40 wt% HF for 96 h at room temperature (RT) has more exceptional charge-discharge performances against mixed NaF+HCl solutions, with an average reversible capacity of ~450 mAh g −1 at 0.1 A g −1 in the 120 cycles and ~301.2 mAh g −1 at 0.5 A g −1 after 200 cycles in LIBs. The effect of etchants on electrochemical performances and lithium-ion (Li-ion) storage mechanism of V 2 Al x CT z was discussed comprehensively. Additionally, a Li-ion full cell using LiFePO 4 as cathode has exhibited excellent electrochemical performance (150.4 mAh g −1 at 0.1 C). This work illustrates that partially-etched V 2 Al x CT z with the submicro-sized distribution is also a promising anode material for LIBs.
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