JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2022
·Vol. 102
·期 11
·4589-4598
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IF 4.125
Wenshuo Zhang,Xiaojie Liu,Shibo Qiu,Lin Chen,Xinghai Liu
BACKGROUND A shelf-life that is too short is the main problem with strawberries. Nano-TiO 2 can catalyze and oxidize ethylene under ultraviolet (UV) light irradiation to eliminate its ripening effect on fruits and prolong the freshness period. RESULTS In this work, nano-TiO 2 modified by methacryloxy propyl trimethoxyl silane (KH570) was blended with low-density polyethylene (LDPE) to prepare modified atmosphere packaging (MAP), and the influence of TiO 2 content on films was analyzed before and after UV treatment. The results show that the modified nano-TiO 2 (M-TiO 2 ) can be uniformly distributed in LDPE, improving its mechanical strength, hydrophobicity, oxygen barrier and UV shielding properties. A modified atmosphere with low ethylene, low O 2 and high CO 2 can be created to inhibit the ripening and spoilage of strawberries. The weight loss rate of fruit can be effectively reduced. The tendency of fruit firmness decline and nutrient loss can be slowed and stabilized, contributing to controllable shelf-life. Excellent freshness preservation function can be realized without special UV treatment. CONCLUSION Since UV treatment is rare in actual storage and transportation, LDPE/M-TiO 2 composite film has practical value as MAP for strawberry and similar non-climacteric fruits. © 2022 Society of Chemical Industry.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 4
·2870-2882
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IF 4.682
Han Ni,Xu Shishi,Zhang Qinfang
The Bi 2 MO 4 Cl (M = Gd and Nd) nanosheets were prepared by a molten salt flux method for the first time. The resulted Bi 2 GdO 4 Cl (F-BG) nanosheets showed the highest photocatalytic activity for oxygen (O 2 ) evolution and trypan blue (TB) degradation than Bi 2 NdO 4 Cl (F-BN), Bi 2 GdO 4 Cl (S-BG) and Bi 2 NdO 4 Cl (S-BN) synthesized by a solid-state method. The F-BG nanosheets showed the larger specific surface areas and abundant pores, which could provide more reactive sites. The photoelectrochemical and photoluminescence (PL) results revealed that F-BG sample had the excellent separation and transfer rates of photogenerated charge carriers, leading to the highly photocatalytic performance for both O 2 evolution and TB degradation. The UV–Vis diffuse reflectance spectra (DRS) showed all samples had the visible-light-responsive characteristic. The radical trapping experiment revealed hole (h + ) played a major role, while superoxide radical ( \(\cdot {\text{O}}_{{2}}^{ - }\) ) contributed a little to photocatalytic degradation process. Thus, a possible photocatalytic mechanism was proposed based on the radical trapping experiment. This work shows us a useful insight into the preparation of highly active bismuth-based oxyhalide nanosheets photocatalysts by a molten salt synthesis through surface modification and morphology control and provides the possibility of water splitting under visible light.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
·
IF 7.8
Hang Yao,Gang Fu,Yuqing Ni,Lei Ni,Juncheng Jiang,Han Zhang,Zhen Cheng,Zhiquan Chen
Nitro-m-xylenes (NMX) was synthesized in semi-batch mode via m-xylene nitration using nitric acid-acetic anhydride (HNO 3 -Ac 2 O) as nitrating reagent in this work. The nitration process was optimized by response surface methodology . The yield of NMX could reach 92.40% under the optimal conditions of jacket temperature of 20 °C, 0.15 mol of HNO 3 and 0.19 mol of Ac 2 O. Corresponding large reaction enthalpy (Δ H =240.9 kJ/mol) and adiabatic temperature rise (Δ T ad,r =398.1 K) indicated the serious hazards of nitration in a thermal runaway scenario. Pyrolysis of nitration products occurred at about 320–400 °C by differential scanning calorimetry tests. The reaction order of the pyrolysis was determined to be 1.2 by adiabatic kinetic analysis . Thermal risk of the nitration process was assessed to be acceptable and level 1 via the risk matrix and Stoessel criticality diagram analyses, respectively. Furthermore, detailed nitration mechanisms for NO 2 + generation and aromatic substitution were presented. The activation free enthalpy and free energy parameters for each step were calculated by density functional theory (DFT). These findings can help understand the exothermic sources of m-xylene nitration and guide the intrinsically safer design and scale-up of the process.
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RSC Advances
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2021
·Vol. 11
·期 8
·4444-4453
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IF 3.361
Ruotong Liu,Chanling Yuan,Yin Feng,Jiayi Qian,Xiaoting Huang,Qiutong Chen,Shuyuan Zhou,Yin Ding,Bingbing Zhai,Wenjie Mei,Liangzhong Yao
Ru(II) complexes have attracted increasing attention as promising antitumor agents for their relatively low toxicity, high affinity to DNA molecules, and correlation with multiple targets. Meanwhile, quinolones are synthetic antibacterial agents widely used in the clinical practice. In this paper, two novel Ru(II) complexes coordinated by levofloxacin (LOFLX), [Ru(bpy)2(LOFLX)]·2ClO4 (1), and [Ru(dmbpy)2(LOFLX)]·2ClO4 (2) (bpy = 2,2′-bipyridine, dmbpy = 4,4′-dimethyl-2,2′-bipyridine) were synthesized with high efficiency under microwave irradiation and characterized by ESI-MS, 1H NMR, and 13C NMR. The binding behavior of these complexes with double-strand calf thymus DNA(CT-DNA) was investigated using spectroscopy, molecular docking, and density functional theory calculations. Results showed that 2 exhibited higher binding affinity than 1 and LOFLX. Further studies showed that 2 could induce the G2/M phase arrest of A549 cells via DNA damage. In summary, these results indicated that 2 could be developed as a potential anticancer agent in treatment of lung cancer through the induction of cell cycle arrest at G2/M phase by triggering DNA damage.
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MACROMOLECULAR MATERIALS AND ENGINEERING
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2019
·Vol. 304
·期 11
·1900310
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IF 3.038
Guangyu Duan,Yan Wang,Junrong Yu,Jing Zhu,Zuming Hu
Dielectric polymer-based composites with high breakdown strengths and thermal conductivities have attracted considerable attention when applied in electronic devices. In this study, a novel poly(m-phenyleneisophthalamide) (PMIA) dielectric nanocomposite is successfully fabricated by introducing functionalized hexagonal boron nitride nanosheet (fBNNS) fillers. Due to effective functionalization of hexagonal boron nitride nanosheets (BNNSs), fBNNSs fillers are homogeneously dispersed in the PMIA matrix. The breakdown strength and thermal conductivity of PMIA/fBNNSs dielectric nanocomposite are investigated. Research results indicate that the breakdown strength of fBNNSs-12 reaches 105.6 MV m −1 , which is 1.34 times that of pure PMIA. Moreover, owing to high thermal conductivity of fBNNSs, the thermal conductivities of fBNNSs-12 are observably increased to 8.06 W m −1 K of in-plane direction and 0.84 W m −1 K of through-plane direction, respectively. Considering these properties, the manufactured PMIA/fBNNSs dielectric nanocomposites show potential applications in field of electronics.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Lan Yang,Lingzong Meng,Tongjie Ge,Dan Li,Tianlong Deng,Yafei Guo
The solubilities in the MCl–M2B4O7–H2O (M = Li, Na) systems at 323.15 K were studied with the isothermal solid–liquid equilibrium method. Both the phase diagrams in the above systems belong to the simple eutectic type. Combining the Pitzer binary parameters of LiCl and NaCl obtained from the literatures, the lacking Pitzer binary parameters of Li2B4O5(OH)4 and Na2B4O5(OH)4, Pitzer mixing parameters θCl–,B4O5(OH)42–, ψLi+,Cl–,B4O5(OH)42–, and ψNa+,Cl–,B4O5(OH)42–, and the solubility product constants of Li2B4O5(OH)4·H2O and Na2B4O5(OH)4·8H2O at 298.15 and 323.15 K were fitted with the experimental solubility data by the Pitzer model. The agreement between the experimental water activities and calculated results with parameters fitted with solubilities in the system LiCl–Li2B4O7–H2O at 298.15 K shows that the parameters fitted with solubilities are reliable. The comparison between the experimental and calculated solubilities of the two systems at 298.15 and 323.15 K shows that calculated solubility data are in agreement with 0.03 of experimental results in the two systems.
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DESALINATION
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2019
·
IF 6.035
Shao-Lu Li,Pengfei Wu,Juntao Wang,Jing Wang,Yunxia Hu
It is well known that the water flux and antifouling performance of polyamide (PA) membrane are strongly associated with their surface characters, especially for surface hydrophilicity , roughness, and charge. In this study, a zwitterionic surface TFC reverse osmosis (RO) membrane was fabricated by small molecule 3-bromopropionic (3-BPA) modification on the pristine membrane that fabricated through interfacial polymerization (IP) technique using a new aqueous monomer 4-morpholinobenzene-1,3-diamine (MpMPD) and trimesoyl chloride (TMC). The as-fabricated RO membranes were well analyzed by various techniques, that the zwitterionic MpMPD-PA membrane surface exhibited greatly enhanced hydrophilicity with water contact angle of 28.1° and surface roughness as low as 26.0 nm. The water permeability of membrane MpMPD-PA reached 1.65 L m −2 h −1 bar −1 , which exhibited ~24% increase compared to our lab-made MPD membrane, meanwhile kept a high NaCl rejection of 97.8%. In addition, the dynamic fouling experiments illustrated that the zwitterionic surface RO membrane possess excellent fouling resistance to protein BSA, polysaccharides SA , and surfactant SDS. Therefore, this work provide a simple and convenient way to fabricate novel zwitterionic surface RO membrane with high performance from the molecular level design.
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ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Juan Xia,Qi Wang,Miaomiao Chen,Wenwen Li,Jie Liu,Jitang Chen,Hai Wu,Suhua Fan
To avoid the evaporation and leakage of the liquid electrolyte and increase the long-term stability of the cell, a strategy was developed to construct bifacial dye-sensitized solar cells employing quasi-solid-state electrolyte (BQDSSCs). Two metal selenides with different morphologies, Co 0.85 Se, which has a foliate structure like the structure of graphene, and Ni 0.85 Se, which has uniform nanoparticle , were synthesized by a facile one-step hydrothermal method . The proposed BQDSSCs were then constructed using the TiO 2 photoanode, polyvinylidene fluoride gel electrolyte, and Co 0.85 Se or Ni 0.85 Se as the counter electrode (CE) electrocatalysts . Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements were performed to investigate the electrochemical behavior of the Co 0.85 Se, Ni 0.85 Se, and Pt CEs. The results showed that the graphene-like Co 0.85 Se material exhibited better operational stability, greater charge-transfer ability, and higher electrocatalytic activity for the reduction of I 3 − than the Ni 0.85 Se nanoparticles. Furthermore, for the BQDSSCs, Co 0.85 Se yielded the highest power conversion efficiencies (PCE) of 8.33% and 4.79% under front and rear irradiations, respectively, in comparison with the front and rear efficiencies of 7.44% and 4.05% for Pt and 7.23% and 4.16% for Ni 0.85 Se CEs, respectively. The BQDSSC device based on the Co 0.85 Se CE exhibited good long-term stability with only a 5% drop in power conversion efficiency after 1000 h of one-sun soaking. Consequently, graphene-like Co 0.85 Se was considered to be an ideal material for constructing cost-effective BQDSSCs.
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Journal of the Taiwan Institute of Chemical Engineers
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2019
·
IF 3.834
Weinan Gong,Bin Xu,Xiaoshuang Yin,Ying Liu,Yun Chen,Wenzhong Yang
The inhibitory effects of three halogen-substituted thiazole derivatives named 2-amino-4-(4-fluorophenyl)-thiazole (FPT), 2-amino-4-(4-chlorophenyl)-thiazole (CPT) and 2-amino-(4-bromophenyl)-thiazole (BPT) on mild steel corrosion were investigated in 0.5 M H 2 SO 4 from 30 °C to 60 °C. Electrochemical measurements demonstrated that these thiazoles can effectively inhibit the corrosion of mild steel in 0.5 M H 2 SO 4 solution at 30 °C. With the increase of temperature, the inhibition efficiency ( η ) of FPT at 60 °C reduced to 22.62% while those of CPT and BPT under the same temperature were nearly unchanged, which were as high as 95.16% and 95.45%, respectively. The adsorptions of three thiazoles on the surface of mild steel were all found to adhere to Langmuir adsorption isotherm at 30 °C while only CPT and BPT obeyed at 60 °C. Quantum calculations results indicated that CPT and BPT had the better adsorption ability on mild steel than FPT. Molecular dynamic stimulations were taken out to investigate the adsorption configurations of three thiazoles on the surface of Fe (0 0 1) at 30 °C and 60 °C, and the results implied that the binding energy of protonated BPT and CPT were nearly unchanged at studied temperatures while that of protonated FPT apparently became lower at 60 °C.
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RSC Advances
·
2019
·Vol. 9
·期 40
·22950-22956
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IF 3.049
Yao Chen,Liang Yang,Shihao Xu,Shuai Han,Suyun Chu,Zhenyang Wang,Changlong Jiang
Poly(m-phenylenediamine) is an excellent adsorbent material. Nevertheless, it is difficult to recover and can even generate secondary pollution due to its powder-like form. Aerogels, monolithic three-dimensional structured materials, that are ultralight and have porous properties are efficient at adsorbing contaminants from water and can solve these problems. Here, we synthesized an aerogel based on molecular-modified poly(m-phenylenediamine) (mPmPD) crosslinking with polyvinyl alcohol (PVA) and graphene oxide (GO) (GO/mPmPD/PVA). Of note is that 3-aminophenylboronic acid was introduced into the polymer structure to induce a crosslinking reaction between boric acid units and PVA to constrain poly(m-phenylenediamine) in the aerogel. The GO/mPmPD/PVA aerogel shows stable mechanical properties in aqueous solution and an effective adsorption capacity for Ag(I); the maximum Ag(I) adsorption capacity is 917.41 mg g−1. The mechanism of Ag(I) adsorption and reduction was clarified in that Ag(I) chelated with imine units, and a redox reaction occured between Ag(I) and the benzenoid amine units. Furthermore, the GO/mPmPD/PVA aerogel also shows excellent adsorption ability toward methyl orange and Congo red dyes. This GO/mPmPD/PVA aerogel shows enormous potential for application to silver recovery and dye removal due to its low cost, effective adsorption capacity and facile separation with aqueous solution.
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International Journal of Environmental Research and Public Health
·
2019
·Vol. 17
·期 1
·167
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IF 2.468
Linfeng Jin,Liyuan Chai,Weichun Yang,Haiying Wang,Liyuan Zhang
Titanium carbides (MXenes) are promising multifunctional materials. However, the negative surface charge and layer-by-layer restacking of MXenes severely restrict their application in the field of anionic pollutants, including in hexavalent chromium (Cr(VI)). Herein, Ti3C2TxMXenes was functionalized through in situ polymerization and intercalation of poly(m-phenylenediamine) (PmPD), then Ti3C2Tx/PmPD composites were obtained. Delightedly, Ti3C2Tx/PmPD composites exhibited positive surface charge, expanded interlayer spacing, and enhanced hydrophobicity. Furthermore, the specific surface area of Ti3C2Tx/PmPD composite was five and 23 times that of Ti3C2Txand PmPD, respectively. These advantages endowed Ti3C2Tx/PmPD composite with an excellent adsorption capacity of Cr(VI) (540.47 mg g−1), which was superior to PmPD (384.73 mg g−1), Ti3C2TxMXene (137.45 mg g−1), and the reported MXene-based adsorbents. The Cr(VI) removal mechanism mainly involved electrostatic adsorption, reduction, and chelation interaction. This study developed a simple functionalization strategy, which would greatly explore the potential of MXenes in the field of anionic pollutants.Keywords:titanium carbides;functionalization;polymerization;hexavalent chromium;adsorption
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JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Xiaogeng Feng,Xiangjie Bo,Liping Guo
Rational synthesis and development of earth-abundant materials with efficient electrocatalytic activity and stability for water splitting is a critical but challenging step for sustainable energy application . Herein, a family of bimetal (CoFe, CoCu, CoNi) embedded nitrogen-doped carbon frameworks is developed through a facile and simple thermal conversion strategy of metal-doped zeolitic imidazolate frameworks. Thanks to collaborative superiorities of abundant M-N-C species, modulation action of secondary metal, cobalt-based electroactive phases, template effect of MOFs and unique porous structure , bimetal embedded nitrogen-doped carbon frameworks materials manifest good oxygen and hydrogen evolution catalytic activity . Especially, after modulating the species and molar ratio of metal sources, optimal Co 0.75 Fe 0.25 nitrogen-doped carbon framework catalyst just requires a low overpotential of 303 mV to achieve 10 mA cm −2 with a low Tafel slope (39.49 mV dec −1 ) for oxygen evolution reaction , which even surpasses that of commercial RuO 2 . In addition, the optimal catalyst can function as an efficient bifunctional electrocatalyst for overall water splitting with satisfying activity and stability. This development offers an attractive direction for the rational design and fabrication of porous carbon materials for electrochemical energy applications.
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