CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Zhongyi Fang,Jie Zhao,Yuan Li,Yu Wang,Tian Qiu,Yanlin Wu,Wenbo Dong,Gilles Mailhot
Fenton-like system had long been modified to promote its adaptability and efficiency by adding extra components like metal chelators or reducers. Nonetheless, chelator such as ethylene diamine tetraacetic acid (EDTA) was harmful in high dosage. While strong reducers could efficiently promote the generation speed of hydroxyl radicals (HO ), they could also get oxidized easily during storage time, for which further application was costly. In this study, (+)-catechin (CAT), an environmental- friendly component, was proved to be an efficient promoter of Fenton-like system on Bisphenol A (BPA) degradation. The modified system achieved 92% of BPA removal in one hour. The mechanism was studied, and the reaction procedure between CAT and Fe(III) together with the degradation pathways of CAT were identified. Fe(III) got chelated first by CAT and quickly reduced to Fe(II) via a single inner-compound electron transfer. The intermediates of CAT could further reduce one and a half more potion of Fe(III) on average. Consequently, massive amount of Fe(II) turned Fenton-like procedure to Fenton reaction and thus promoted the generation of HO . The main radicals contributed on BPA degradation was HO . BPA could be efficiently degraded at pH 6.5 or acidic pH range, but the degradation was completely inhibited with the pH higher than 8.0. The optimal mole ratio between Fe(III) and CAT was 6:1 and the degradation pathway of BPA was deduced.
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CARBON
·
2020
·
IF 8.821
Xiaochuang Di,Yan Wang,Yuqiao Fu,Xinming Wu,Ping Wang
Thin and lightweight absorbers with strong absorption capacity are future development directions in the field of electromagnetic wave (EMW) absorption. Based on two microwave-absorbing mechanisms, the three-dimensional (3D) porous carbon materials derived from wheat flour were prepared via pyrolysis carbonization . Then, ZnFe 2 O 4 nanospheres were synthesized and distributed on the surface of carbon skeleton by simple solvothermal method. Results showed that microwave absorption performance was significantly improved due to synergistic effects between ZnFe 2 O 4 nanospheres and carbon matrix. With absorber thickness of only 1.8 mm and low filler loading of 20 wt%, the minimum reflection loss could reach as low as −54.1 dB at 14.1 GHz. The widest effective absorption bandwidth ranged from 9.2 GHz to 15.0 GHz (5.8 GHz) with a thickness of 2.5 mm when the filler loading was 10 wt%, covering 36% of entire measured bandwidth. As an absorber, 3D porous carbon@ZnFe 2 O 4 composite exhibited ideal microwave absorption properties because of synergistic effects between dielectric and magnetic loss, well-matched impedance, interfacial polarization , Debye relaxation process as well as multiple reflection and scattering. Considering excellent EMW absorption performance, the porous carbon@ZnFe 2 O 4 composite fabricated by a simple method can provide a new inspiration for designing structure and composition of lightweight microwave absorbers.
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Advanced Healthcare Materials
·
2020
·Vol. 9
·期 17
·2000560
·
IF 7.367
Weiwei Zeng,Yan Xu,Weitao Yang,Kai Liu,Kexin Bian,Bingbo Zhang
Ultrasound (US)-triggered sonodynamic therapy (SDT) can significantly solve the problem of tissue penetrability of light of photodynamic therapy (PDT) that has long vexed physicians in clinics. However, there is a great shortage of sonosensitizers for SDT. Currently, several photosensitizers and their derivatives have been reported for SDT but these dyes are usually quenched when aggregated due to aggregation-caused quenching (ACQ) effect. In this work, aggregation-induced emission (AIE) dye (TTMN) assembled nanoparticles (S-AIE) are synthesized and employed as sonosensitizers for enhanced SDT due to the unique properties of the AIE dye and the deep tissue penetration of ultrasound. Results show that S-AIE can generate potent singlet oxygen ( 1 O 2 ) under US irradiation to induce cancer cells apoptosis and clearly inhibit tumor growth in vitro and in vivo. In particular, the intrinsic fluorescence of AIE dye can guide the procedure of SDT. To the best of current knowledge, this is the first demonstration of AIE dyes being used as sonosensitizers for SDT and importantly, this work could inspire other more efficient AIE dyes for being used as sonosensitizers for SDT of deep-seated tumors.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Xiaoyu Shi,Xiaodong Zhang,Fukun Bi,Zenghui Zheng,Lijun Sheng,Jingcheng Xu,Zhong Wang,Yiqiong Yang
In this thesis, defective UiO-66-NH 2 using cetyltrimethylammonium bromide (CTAB) as a template was successfully synthesized. The toluene adsorption-desorption properties were studied using breakthrough experiments and temperature programmed desorption (TPD). Modified UiO-66-NH 2 showed a high toluene increase due to the increased specific surface area and total pore volume and extra accessible adsorption sites generated by defects. Additionally, adsorption mechanisms were discussed at micro and molecule levels in light of density functional theory (DFT) calculations. By calculation, the amino hydrogen bonding gave rise to a higher toluene adsorption over UiO-66-NH 2 . In terms of the modified UiO-66-NH 2 with the most deficiencies, synergistic effects among π-π, -NH 2 , OH-CH 3 and OH-π hydrogen bonding strength also significantly intensified toluene adsorption. Furthermore, it could be noted that the OH-π interaction was stronger than the two bonded μ 3 -OH mechanisms. Notably, TPD and binding energies (BEs) depicted that defective UiO-66-NH 2 had a weaker toluene affinity than did UiO-66-NH 2 . Thus, gas toluene was easy to desorb with defective UiO-66-NH 2 at 298 K under atmospheric pressure. Finally, the repetitive regeneration experiment showed that the reproducibility of the materials was excellent.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Guoan Lin,Xiaoxiang Xu
LaTiO2N has been considered as one of the most promising photocatalysts for solar energy conversion. Nevertheless, it generally has a poor photocatalytic activity under normal conditions, probably linked to severe structural distortions and various types of defects within this compound. Herein, we modified LaTiO2N by introducing Ba into its A site, that is, La0.8Ba0.2TiO2.2N0.8. The presence of Ba at the A site of LaTiO2N not only relaxes the structural distortions but also effectively inhibits defect formation (e.g. Ti3+ species) in LaTiO2N. Moreover, surface hydrophilicity of LaTiO2N is also improved by Ba modification. Photoelectrochemical analysis suggests that charge separation and transferring situation are ameliorated in Ba-modified LaTiO2N, and the valence band edge position is positively shifted. These factors are likely the reasons for the improved photocatalytic activity of La0.8Ba0.2TiO2.2N0.8 in water oxidation reactions.
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Keke Sun,Xiaoqin Peng,Shuping Wang,Lu Zeng,Peng Ran,Guangxiang Ji
To inhibit the efflorescence of geopolymers, nano-SiO 2 particles were used as an additive to modify an alkali-activated metakaolin mortar. In this work, the effect of the nano-SiO 2 on the compressive strength, pore structure and ion leaching of geopolymers was investigated. Based on these results, the inhibitory mechanism of the nano-SiO 2 on the efflorescence of the geopolymer mortar was analyzed. The results showed that the nano-SiO 2 improved the compressive strength and inhibited the efflorescence of the geopolymer mortar. The nano-SiO 2 decreased the efflorescence by consuming excessive alkali ions in the pore solution to form an amorphous gel phase, and the negative effect of the efflorescence on the compressive strength was also verified. Moreover, the pore structure and transport properties of the geopolymer were also improved by the addition of the nano-SiO 2 , which reduced the diffusion rate and leaching of the ions.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Hongwei Ge,Guoqiang Liu,Ranhao Yin,Zhenli Sun,Hongxia Chen,Long Yu,Pengchen Su,Mingtai Sun,Khalid A. Alamry,Hadi M. Marwani,Suhua Wang
Formaldehyde, a volatile organic compound that is ubiquitous in gas pollutants, has an indelible hazard to the health system of humans. Development of simple and convenient ways for the visual detection of formaldehyde in air is still of importance and challenging. In this paper, we report a new type of fluorescence enhancement probe (FAP), which directly exhibited fluorescence enhancement response to formaldehyde with high sensitivity and selectivity. The FAP was synthesized through the substitution reaction between hydrazine and NBD (7-nitrobenzo-2-oxa-1, 3-diazolyl) chloride, that the hydrazine group acted as both fluorescence quencher based on the photo-induced electron transfer (PET) pathway and reaction triggering factor for selectively recognizing formaldehyde. When the FAP was incubated with a formaldehyde-containing circumstance, Schiff base compound was produced by means of the aldimine condensation reaction which inhibited the PET pathway from hydrazine group to NBD, and thus turned on the fluorescence of the FAP significantly. It is worth mentioning that the FAP showed more remarkable response to formaldehyde under acid conditions. Under the optimal experimental conditions, the FAP responded linearly toward formaldehyde in a wide range of 0.015–0.8 mg•L −1 , while the fluorescence enhancement was close to 30 times. This FAP was successfully used to detect gaseous formaldehyde in indoor air.
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CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Li-Chao Wang,Lian Xu,Xin-Qi Xu,Bing-Mei Su,Juan Lin
L-threonine aldolase (LTA) is a PLP-dependent enzyme that can reversibly catalyze aldol reaction of glycine and acetaldehyde to produce β -hydroxy- α -amino acids. In the present work, a putative lta gene from Actinocorallia herbida (AhLTA) was mined and over-expressed in Escherichia coli BL21 (DE3). The substrate spectrum assay indicated that AhLTA only used glycine as donor substrate and tolerated a wild range of aromatic aldehydes as acceptor substrates. It was found that the type and position of substituents in the aromatic aldehydes exerted a significant impact on the activity and stereoselectivity at β -carbon of AhLTA. Among those substrates, AhLTA could catalyze glycine and 4-methylsulphonyl benzaldehyde ( 14a ) to produce L- threo -4-methylsulfonylphenylserine ((2 S ,3 R )- 14b ) with high conversion (94.4%) and moderate stereoselectivity (19% de ). By conditional optimization, the de value of (2 S , 3 R )- 14b was improved to 61% and the conversion was 75%. Taken together, our study suggested that AhLTA might be a promising catalyst for producing chiral β -hydroxy- α -amino acids.
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ULTRASONICS SONOCHEMISTRY
·
2020
·
IF 6.513
Furong Hou,Liang He,Xiaobin Ma,Danli Wang,Tian Ding,Xingqian Ye,Donghong Liu
In order to evaluate the effect of ultrasound to chitinase from a molecular level, atomic force microscopy (AFM) was employed to investigate the interaction force of chitinase binding onto chitin surface. In the measurement of force-distance curve, a series of pull-off events were discovered using the immobilized AFM tips with chitinase either treated by ultrasound or not, whereas no interaction peak was observed by the AFM tips without chitinase, indicating that the obtained adhesion forces were coming from the binding functions between chitinase and chitin. Through the analysis of these force curves, at the loading velocity of 0.3 μm/s, the maximum binding force of the chitinase treated by ultrasound for 20 min onto chitin was measured to be 105.33 ± 23.51 pN, while the untreated onto chitin was 71.05 ± 12.73 pN, suggesting the stronger binding force between ultrasonic treated chitinase and chitin substrate. Therefore, AFM has provided a useful method to directly and quantitatively characterize the interactions between chitinase and chitin, and successfully proved that ultrasound could activate chitinase by enhancing the binding ability of chitinase onto chitin.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 16
·6428-6434
·
IF 3.288
Chang Dong,Yijia Yu,Xiaoling Zhang,Liyan Huang,Ying Wu,Jun Li,Zhengping Liu
Ionic liquids (ILs) with wide electrochemical windows are increasingly used as electrolytes to improve the energy density of graphene-based supercapacitors. However, due to irreversible agglomeration during the reduction of graphene oxide (GO) to reduced graphene oxide (RGO) and less compatibility between the IL electrolyte and RGO, RGO-based electrode materials in an IL electrolyte usually exhibit poor electrochemical properties. To address these issues, we chose an ionic liquid with a similar structure to the electrolyte as a modifier and fabricated reduced graphene oxide composites modified with the chosen ionic liquid (RGO–IL) by a hydrothermal method. The integration of ILs with RGO could prevent the aggregation and restacking of GO layers and improve the compatibility between the RGO–IL electrode and IL electrolyte. The symmetrical supercapacitor assembled using the obtained RGO–IL2 electrode material showed an outstanding energy density (50.19 W h kg−1 at 0.75 kW kg−1) and excellent cycle performance (87.23% retention of the original value after 2000 cycles at 5 A g−1) in the IL electrolyte. These superior performances make RGO–IL composites one of the apposite choices of electrode materials for supercapacitors.
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NPG Asia Materials
·
2020
·Vol. 12
·期 1
·1-11
·
IF 8.131
Sun Ao,He Xinye,Li Lang,Li Tao,Liu Qinya,Zhou Xinli,Ji Xiao,Li Wei,Qian Zhiyong
Abstract Currently, wound infection is an important health problem for the public. Wound infection can not only hinder healing but it can also lead to serious complications. Injectable wound dressings with biocompatible and antibacterial properties can promote wound healing during skin infections and reduce antibiotic use. Here, we used glycidyl methacrylate (GMA) to modify ε-polylysine (ε-PL) and γ-poly(glutamic acid) (γ-PGA) to produce ε-polylysine-glycidyl methacrylate (ε-PL-GMA) and γ-poly(glutamic acid)-glycidyl methacrylate (γ-PGA-GMA). Subsequently, ε-PL-GMA- and γ-PGA-GMA-based hydrogels were developed through photopolymerization using visible light. The hydrogels were injectable, could rapidly gelatinize, were biocompatible, and showed a wide spectrum of antibacterial activity. The hydrogels also promoted wound healing. The results show that these hydrogels inhibit bacterial infection and shorten the wound healing time of skin defects in Staphylococcus aureus models. This demonstrates that the hydrogels hold potential for clinical antimicrobial and wound healing therapy.
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Microbial Biotechnology
·
2020
·Vol. 14
·期 2
·444-452
·
IF 5.328
Meng-Nan Han,Xu-Ming Wang,Chao-Hong Pei,Chao Zhang,Zhidong Xu,Hong-Lei Zhang,Wei Li
Summary Chiral aromatic alcohols have received much attention due to their widespread use in pharmaceutical industries. In the asymmetric synthesis processes, the excellent performance of alcohol dehydrogenase makes it a good choice for biocatalysts. In this study, a novel and robust medium-chain alcohol dehydrogenase RhADH from Rhodococcus R6 was discovered and used to catalyse the asymmetric reduction of aromatic ketones to chiral aromatic alcohols. The reduction of 2-hydroxyacetophenone (2-HAP) to ( R )-(-)-1-phenyl-1,2-ethanediol (( R )-PED) was chosen as a template to evaluate its catalytic activity. A specific activity of 110 U mg −1 and a 99% purity of e.e . was achieved in the presence of NADH. An efficient bienzyme-coupled catalytic system (RhADH and formate dehydrogenase, CpFDH) was established using a two-phase strategy (dibutyl phthalate and buffer), which highly raised the tolerated substrate concentration (60 g l −1 ). Besides, a broad range of aromatic ketones were enantioselectively reduced to the corresponding chiral alcohols by this enzyme system with highly enantioselectivity. This system is of the potential to be applied at a commercial scale.
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高影响因子
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