Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Shuo Yan,Yun Li,Jilin Cao
The calcium nitrate (Ca(NO 3 ) 2 ) waste generated from the production of nitrophosphate fertilizers brings about serious environment and human health issues. Using Ca(NO 3 ) 2 waste and ammonium bicarbonate (NH 4 HCO 3 ) fertilizer as raw materials, higher-value spherical calcite mesocrystals have been synthesized via precipitation method. The synthesis conditions are optimized from the aspects of dispersant, crystal control agent and reaction temperature, and the mechanism that regulates the size and morphology of calcite is illustrated. The synthesized spherical calcite mesocrystals exhibit the small particle size of ca. 5 µm and high specific surface area of 84.44 m 2 /g. Under the dispersion effect of polyvinylpyrrolidone, the adsorption of crystal control agent citric acid on the calcite particles results in the formation of the spherical mesocrystal morphology. The yield of calcite in this process could reach 94.3%. Ca 2+ ion remaining in the mother liquor are further removed in the form of CaCO 3 by addition of calcium oxide , and a mixture of ammonium nitrate and a small amount of NH 4 HCO 3 is obtained by concentrating the filtrate, which can be used as nitrogen fertilizers. This work provides a new insight into the low-cost synthesis of spherical calcite mesocrystals with the high specific surface area and the comprehensive utilization of Ca(NO 3 ) 2 waste.
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Experimental and Therapeutic Medicine
·
2021
·Vol. 22
·期 6
·1-8
·
IF 2.447
Chun Lei,Yafeng Hou,Jiong Chen
Bone marrow stromal cell antigen 2 (BST2) has been reported to act as an oncogene in the tumorigenesis of numerous types of cancer. Bioinformatics analysis has predicted the binding interaction between BST2 and specificity protein 1 (SP1) and the involvement of SP1 in pancreatic cancer. Therefore, the present study set out to verify this interaction and determine how it may affect pancreatic cancer progression. Normal human pancreatic duct epithelial cells (HPDE6‑C7) and pancreatic cancer cell lines (SW1990, BxPC3, PANC1 and PSN‑1) were selected for western blotting and reverse transcription‑quantitative PCR detection of BST2 expression. Colony formation, Cell Counting Kit‑8 and wound healing assays were performed to detect the proliferative and migratory abilities of PANC1 cells following transfection with small interfering RNA against BST2. The expression of proliferation and migration markers were assayed using western blotting. Chromatin immunoprecipitation and luciferase reporter assays were employed to verify the bioinformatics prediction of BST2‑SP1 binding. PANC1 cell proliferation and migration were analyzed following BST2 knockdown and SP1 overexpression. In comparison with HPDE6‑C7 cells, all four pancreatic cancer cell lines were found to exhibit increased BST2 expression levels to varying degrees, with the highest levels observed in PANC1 cells. BST2 knockdown inhibited PANC1 cell colony formation, proliferation and migration. Additionally, SP1 was shown to bind to the BST2 promoter and could promote PANC1 cell proliferation and migration when overexpressed. However, BST2 knockdown rescued SP1 overexpression‑induced PANC1 cell colony formation, proliferation and migration. In conclusion, activation of BST2 by the transcription factor SP1 was shown to accelerate pancreatic cancer cell proliferation and migration, suggesting that BST2 and SP1 may be plausible therapeutic targets in targeted therapy for pancreatic cancer.
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高影响因子
DALTON TRANSACTIONS
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2021
·Vol. 50
·期 28
·9746-9753
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IF 4.39
Yan He,Tao Yu,Hui Wen,Rui Guo
For the electrocatalytic oxygen evolution reaction (OER) in alkaline media, there is an urgent need to optimize the adsorption strength of OH*. Here, a flower-like hybrid of Cr-doped FeOOH/Ni(OH)2 was used as an OER catalyst with a low overpotential of 291 mV at 50 mA cm−2. The results showed that faster charge transfer was achieved at the electrode/solution interface during the OER process after the FeOOH/Ni(OH)2 was modified by Cr, which facilitates the rate-determining step of the Volmer reaction. Furthermore, the results of faradaic efficiency and X-ray photoelectron spectroscopy (XPS) measurements confirmed that the synergistic effect between the ternary metal and oxygen vacancies led to excellent OER performance. This work provides a new strategy for the preparation of high-efficiency and low-cost oxygen evolution electrocatalysts.
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高影响因子
RSC Advances
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2021
·Vol. 11
·期 34
·21084-21096
·
IF 3.361
Tingting Chen,Shan Hu,Quanfeng Xing,Xiaofeng Yu,Jinming Chen,Xiaolong Li,Xiuquan Xu,Bo Zhang
Embedding heterocycles into the skeleton of g-C3N4 has been proved to be a simple and efficient strategy for improving light response and the separation of photo-excited charges. Herein, 2-thiobarbituric acid incorporated g-C3N4 (TBA/CN) with good photocatalytic efficiency for Rh B degradation and H2 production was successfully achieved via a facile thermal copolymerization approach. The incorporation of aromatics and S atoms into the skeleton of g-C3N4 was identified via systematic characterizations. This unique structure contributed to the narrowed band-gap, extended delocalization of lone pair electrons and changed electron transition pathway, which led to the enhanced visible light utilization, accelerated charge migration and prolonged electron lifetime, subsequently resulting in the significant boost of photocatalytic activity. The optimal TBA/CN-3 sample yielded the largest Rh B degradation rate constant k value of 0.0273 min−1 and simultaneously highest rate of H2 evolution of 0.438 mmol g−1 h−1, which were almost 3.5 and 3.8 folds as fast as that of the pristine CN, respectively. Finally, the photocatalytic mechanism was proposed for the detailed elucidation of the process of Rh B degradation coupled with H2 production.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Chi Zhang,Zhuohong Xie,Yi Liang,Dingding Meng,Zheng Wang,Xin He,Weiye Qiu,Mei Chen,Ping Liang,Zhonghua Zhang
Ni(OH) 2 has been long studied as an effective oxygen evolution electrocatalyst . Nevertheless, its catalytic activity can still be further enhanced by microstructural modification and Fe-doping. In this study, with the assistance of adsorbent ferrihydrite (FH), we obtain Fe-doped β-Ni(OH) 2 nanoplates with Fe 2 O 3 nanoparticles decorated on the surface via a facile hydrothermal process. The Fe-doping, decorated Fe 2 O 3 nanoparticles , and special microstructure endow β-Ni(OH) 2 nanoplates with an improved oxygen evolution activity in alkaline solutions. For the sample with optimal FH amount, the overpotential to motivate a current density of 10 mA cm −2 is 280 mV, with a low Tafel slope of ~64.17 mV dec −1 . During the 10 h i-t test at 1.50 V vs. RHE , the current density has an attenuation of only 23.7%. The study opens a facile avenue to modify Ni(OH) 2 -based OER catalyst from perspectives of both microstructures and compositions .
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2021
·
IF 5.279
Yang Xu,Yuting Li,Jiahong Xie,Lianghua Xie,Jianling Mo,Wei Chen
The present study is aimed to clarify the absorption and metabolism properties of pelargonidin-based anthocyanins. Results showed that pelargonidin-3-O-rutinoside (Pg3R) was absorbed in its intact form after oral administration and reached a maximum plasma concentration of 175.38 ± 55.95 nM at 60 min. Three main metabolites were identified in plasma, including Pg3R-monoglucuronide (m/z 755.2046), Pg3R-hydroxylated (m/z 595.1644), and Pg3R-demethylated (m/z 565.1569) metabolites. The plasma concentration of the Pg3R-demethylated metabolite (57.04 ± 23.15 nM) was much higher than that of other two metabolites, indicating that demethylation was the main metabolic pathway for Pg3R, while the glucuronide conjugate was detected as the dominant metabolic form of pelargonidin-3-O-glucoside (Pg3G). The bioavailability of Pg3R (1.13%) was fourfold higher than that of Pg3G (0.28%), demonstrating that anthocyanins linked to the rutinoside may exhibit higher bioavailability than that of glucoside. In vitro transport study unveiled that passive diffusion and active efflux were involved in the absorption of Pg3R and Pg3G.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Kun Song,Wenting Li,Rui Yang,Yongjie Zheng,Xiaoshuang Chen,Xin Wang,Guoli Chen,Weichao Lv
As a battery-type electrode material , Ni(OH) 2 has been widely concerned for its ultra-high theoretical specific capacity, however, its poor conductivity and lack of effective active sites hinder its application. It is a great challenge to develop Ni(OH) 2 based supercapacitors . It is critical to improve the electrical conductivity and effective active sites to make full use of the energy storage of Ni(OH) 2 -based materials. Therefore, Ni(OH) 2 /NiS composites are designed and prepared by controllable low temperature chemical deposition and ion exchange method. Ni(OH) 2 nanosheets with various morphology are controllably prepared by low temperature chemical deposition, and then Ni(OH) 2 /NiS composites are controllably prepared on Ni(OH) 2 substrate by ion exchange. Due to the doping of NiS into Ni(OH) 2 nanosheets, the conductive network structure is formed, which makes the composite exhibit excellent electrochemical properties, such as high specific capacity, large specific surface area and good electrical conductivity. The as-fabricated Ni(OH) 2 /NiS indicates an outstanding specific capacity of 240.5 mAh g −1 at 1 A g −1 . This paper detailed studies the practical application of hybrid supercapacitors , which may inspire future researchers to design Ni(OH) 2 -based materials with desired applications.
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MATERIALS & DESIGN
·
2021
·
IF 7.991
Xuesong Zhang,Yuguang Li,Changxiang Li,Fan Yang,Zhengming Jiang,Liyan Xue,Zhiheng Shao,Zhigang Zhao,Meiying Xie,Shuwen Yu
In this study, a new type of (La 0.2 Ce 0.2 Gd 0.2 Er 0.2 Tm 0.2 ) 2 (WO 4 ) 3 single-phase high-entropy ceramic (HEC) powder was designed, prepared by solid-phase synthesis, and evenly mixed into an epoxy resin (EP) matrix to test the thermal neutron and γ-ray shielding performance. In terms of γ-ray shielding, (La 0.2 Ce 0.2 Gd 0.2 Er 0.2 Tm 0.2 ) 2 (WO 4 ) 3 showed a higher lead equivalent value than EP at 65 keV, indicating a clear shielding effect in the feeble absorbing area of lead-based and bismuth-based materials; moreover, (La 0.2 Ce 0.2 Gd 0.2 Er 0.2 Tm 0.2 ) 2 (WO 4 ) 3 showed good γ-ray shielding performance in both low-energy and medium-energy regions. In terms of thermal neutron shielding, the composite with the highest HEC content (EP/W3) had a nearly 100% shielding efficiency, while that of EP was approximately 50%, indicating that this material has favorable thermal neutron and γ-ray shielding performance. Moreover, the thermal conductivity of the resulting composite material was lower than 0.3 W·m −1 ·K −1 , the tensile strength was higher than 10 MPa, and the density was lower than 1.5 g·cm −3 . All these results suggest that (La 0.2 Ce 0.2 Gd 0.2 Er 0.2 Tm 0.2 ) 2 (WO 4 ) 3 is a candidate radiation shielding material.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 16
·5617-5623
·
IF 4.39
Dandan Wang,Xinyuan Zhang,Fei Liang,Zhanggui Hu,Yicheng Wu
Birefringent crystals can modulate and detect the polarization of light, and have been widely used in the field of optoelectronic devices. The combination of a d10 transition metal cation and π-conjugated (H2C3N3O3)− group is a feasible approach for the synthesis of new crystal structures possessing large birefringence and short cutoff edges. Herein, a new hydroisocyanurate birefringent material Zn(H2C3N3O3)2·3H2O (ZHCY) was synthesized by a mild hydrothermal method. ZHCY featured a 2D layered ribbon structure constituted by coplanar π-conjugated (H2C3N3O3)− hydroisocyanurates, and displayed a wide band gap (5.24 eV) and a large birefringence (Δnexp ∼ 0.323, Δncal = 0.283 at 800 nm). Theoretical calculations revealed that its optical properties mainly originated from the π-conjugate coplanar (H2C3N3O3)− groups, which contribute to the enhancement of birefringence.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2021
·
IF 2.917
Ai-min LIU,Meng-xia GUO,Zhong-ning SHI,Yu-bao LIU,Feng-guo LIU,Xian-wei HU,You-jian YANG,Wen-ju TAO,Zhao-wen WANG
Zinc chloride (ZnCl 2 ) was dissolved in the 1,3-dimethyl-2-imidazolinone (DMI) solvent, and the metallic zinc coatings were obtained by electrodeposition in room-temperature ambient air. The conductivity ( σ ), viscosity ( η ), and density ( ρ ) of the DMI−ZnCl 2 solvated ionic liquid at various temperatures ( T ) were measured and fitted. Furthermore, cyclic voltammetry was used to study the electrochemical behavior of Zn(II) in the DMI−ZnCl 2 solvated ionic liquid, indicating that the reduction of Zn(II) on the tungsten electrode was a one-step two-electron transfer irreversible process. XRD and SEM−EDS analysis of the cathode product confirmed that the deposited coating was metallic zinc. Finally, the effects of deposition potential, temperature and duration on the morphology of zinc coatings were investigated. The results showed that a dense and uniform zinc coating was obtained by potentiostatic electro- deposition at −2 V (vs Pt) and 353 K for 1 h.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shuo Geng,Yarong Huang,Akhmat Fauzi,Yongsheng Yu,Yequn Liu,Weiwei Yang
The synthesis of highly efficient non-noble bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte is important for the industrial application of electrocatalytic water splitting. Herein, non-noble bifunctional electrocatalyst Ni 0.67 Co 0.33 (PO 3 ) 2 nets with optimized morphology were successfully synthesized. Owing to the micropores with the accelerated electrolyte and gases transfer and nanopores architecture with more exposed active edge sites, the self-supported Ni 0.67 Co 0.33 (PO 3 ) 2 -12 h electrode exhibits a superior water splitting performance. Impressively, the Ni 0.67 Co 0.33 (PO 3 ) 2 -12 h electrode only needs a cell voltage of 1.46 V to achieve 10 mA/cm 2 and shows over 22 h stability at 10, 50 and 100 mA/cm 2 , respectively. This present work suggests a unique and earth abundant material synthesis method for water electrolysis, which has broad prospects for practical water splitting application.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Lei Xu,Shaoyu Tang,Dan Li,Xiao Ma,Yunqing Zhu,Jianjiang Lu,Junfeng Niu
The current study presents a comprehensive and novel attempt to degrade aqueous tri(2-chloroethyl) phosphate (TCEP) by metal-oxide-coated Ti anodes for the first time. Six metal-oxide-coated Ti electrodes (Ti/SnO 2 -Sb, Ti/SnO 2 -Sb/PbO 2 , Ti/SnO 2 -Sb/La-PbO 2 , Ti/SnO 2 -Sb/Ce-PbO 2 , Ti/SnO 2 -Sb/Ga-PbO 2 and Ti/SnO 2 -Sb/Zr-PbO 2 ) were prepared and characterized. Ti/SnO 2 -Sb/La-PbO 2 showed the highest pseudo-first-order reaction rate constant (2.1 × 10 −2 min −1 ) and lowest energy consumption (21.35 Wh L −1 ) in the degradation of 1 mg L −1 TCEP at 10 mA cm −2 , mainly because of its highest oxygen evolution potential and OH production. Higher current density and neutral condition favored TCEP degradation, while the presence of Cl − or NO 3 − could suppress the degradation. In the electrochemical degradation of 10 mg L −1 TCEP, mineralization percentage of 48.0% (mineralization current efficiency of 0.30%) and PO 4 3− release percentage of 72.7% were achieved at 150 min. By the attack of OH on the C O and C Cl bonds in TCEP molecular structure, products of chloroethanol, Cl − and PO 4 3− were released, with the major electrocatalytic degradation pathways of dechlorination and hydroxylation. Based on the results of flow cytometry, the relative toxicity to Escherichia coli effectively decreased to 4.93% in TCEP degradation. Compared with the UV-AOPs, electrochemical oxidation process is proved to be feasible and effective for mineralization and detoxification of TCEP in water.
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