APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Ni Han,Qixiang Xu,Gashaw Beyene,Qinfang Zhang
Photocatalytic degradation has been regarded as a promising method for environmental remediation. In this work, layered g-C 3 N 4 /(BiO) 2 (OH) x Cl 2− x (NBHC) heterojunction composites were synthesized by a hydrothermal method. The two-dimensional (2D)/2D porous layered Z-scheme heterojunction leaded to the suppressed recombination and the efficient separation of photogenerated electron-hole pairs. Meanwhile, NBHC composites exhibited a high specific surface area and rich mesopores for more reactive active sites. Thus, NBHC had an excellent photocatalytic degradation performance of pollutant trypan blue (TB). Furthermore, we found that the active species of superoxide radical ( O 2 − ) played a more important role, while hydroxyl radical ( OH) contributed to a lesser extent in photocatalytic degradation of TB based on the active species capture experiment and electron spin resonance (ESR) spectra. A Z-scheme photocatalytic mechanism was proposed to understand the photodegradation of TB. This study may provide a new horizon for constructing novel Z-scheme heterostructure photocatalysts with an excellent performance.
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JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 11
·6228-6236
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IF 1.938
Liang Yue,Weng Ling,Zhang Wenlong
Polypropylene (PP) is considered a promising material for eco-friendly high-voltage direct current (HVDC) cable insulation. However, PP is prone to space charge accumulation under direct current (DC) electric stress, which limits its applications. In this study, 4-allyloxy-2-hydroxybenzophenone (AHB) with polar functional groups and a conjugated structure was grafted onto PP via melt grafting to improve its electrical properties. The effects of several reaction variables, specifically initiator and monomer content, reaction temperature, rotor speed, and grafting yield time were studied, and the optimal grafting conditions were determined. Evidence of grafting was examined by Fourier transform infrared (FTIR) spectroscopy. Moreover, the space charge characteristics, volume resistivity, and DC breakdown strength of the grafted PP were also studied. The FTIR results demonstrated that the AHB monomer was successfully grafted onto PP, and the maximum grafting yield obtained under the optimal grafting conditions was 0.94%. Furthermore, when the grafting yield was 0.73%, the grafted PP effectively inhibited space charge accumulation and exhibited the highest volume resistivity and DC breakdown strength. Thus, this work provides useful ideas for the design and development of environmentally friendly polymer insulating materials for HVDC applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Songmei Li,Yimin Yu,Xiaoyan Sun,Xifeng Ding,Huafang Yang,Shibing Pan,Lixi Wang,Qitu Zhang
Ni(OH) 2 has been acknowledged as a promising oxygen evolution reaction (OER) electrocatalyst owing to its good electrochemical activity and low cost. However, application of the pristine Ni(OH) 2 is limited by the poor conductivity and low exposure of the active sites. Herein, a [email protected] (OH) 2 composite is prepared through a hydrothermal reaction. Heat treatment temperature proves to have a great influence on the electrocatalytic activity. In 0.1 M KOH electrolyte, the composite treated at 175 °C shows an overpotential of only 287 mV to reach the current density of 10 mA·cm −2 . Besides, the low Tafel slope (42 mV·dec −1 ) and superior stability (15 h at 10 mA·cm −2 ) also confirm the composite as an excellent OER electrocatalyst. The brilliant activity and stability toward OER can be attributed to the promoted coupling between Ni and Fe centers and the improved conductivity due to the 2D 18 p-electrons ring conjugate structure of hemin. Besides, effective hydrogen bonds between Ni(OH) 2 and hemin hinder the aggregation of Ni(OH) 2 , which ensures the catalyst enormous accessible active sites. This work offers a new method for the modification of Ni(OH) 2 as OER electrocatalysts. And the application of hemin also serves as a successful case for the use of biomass materials in OER electrocatalysis .
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Zhengdi Jiang,Zhen Li,Zhenyu Chen,Xuanrui Zhang,Weijie Fan,Yuan Liu,Hui Dan,Yi Ding,Tao Duan
Zircon (ZrSiO 4 ) ceramics were widely used in the field of nuclear waste immobilization because of their excellent properties. However, the SiO 2 /ZrSiO 4 ceramics were usually obtained in the preparation of ZrSiO 4 . The actinides immobilization behavior of SiO 2 /ZrSiO 4 ceramics is unclear. Herein, Nd-doped 0.2SiO 2 /Zr 1- x Nd x SiO 4- x /2 (0≤ x ≤ 0.1) ceramics were fabricated and the effects of Nd-doping and sintering temperature on their phase and microstructure evolution were investigated. The obtained ceramics were characterized by XRD , SEM, BSE and EDS . Results show that 0.2SiO 2 /Zr 1- x Nd x SiO 4- x /2 ceramics with 0≤ x < 0.04 are ZrSiO 4 phase; while with 0.04≤ x ≤ 0.1 are coexistence of ZrSiO 4 and Nd 2 Si 2 O 7 phases. The solubility limit of Nd 3+ in 0.2SiO 2 /ZrSiO 4 is about 4 at%. The lattice volume of ZrSiO 4 increased with increasing Nd-doped content and sintering temperature. Furthermore, higher Nd-doped content and sintering temperature are beneficial to the densification of the obtained ceramics. The results demonstrate that the 0.2SiO 2 /ZrSiO 4 ceramics can be employed as waste form materials to immobilize trivalent actinides.
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Microorganisms
·
2019
·Vol. 7
·期 10
·379
·
IF 4.167
Huanhuan Shao,Meiju Chen,Xueting Fei,Ronglin Zhang,Yue Zhong,Weimin Ni,Xiang Tao,XinYi He,Erliang Zhang,Bin Yong,Xuemei Tan
A bacterial strain,Streptomyces albogriseolusLBX-2, was isolated from a soil sample in Chengdu, China.S. albogriseolusLBX-2 is an aerobic and Gram-positive microorganism that is capable of using the polyethylene as the sole carbon source. Results of scanning electron microscopy and tensile tests indicated thatS. albogriseolusLBX-2 could cause the damages to polyethylene (PE). Suspension culture of LBX-2 resulted in the weight loss in the PE powder over a 15-day period. The bacterial growth curve assay clearly demonstrated the utilization of n-hexadecane and n-octadecane for the strain LBX-2. Phylogenetic analysis showed that it was grouped in the same clade asS. albogriseolusbelonging toStreptomyces. The complete genome of strain LBX-2 consists of a chromosome of 7,210,477 bp and a linear plasmid of 336,677 bp. Compared with other strains ofStreptomyces, the genome size ofS. albogriseolusLBX-2 was smaller than the average but its guanine and cytosine content (72.47%) was higher than the others. The Non-Redundant Protein Database (NR), Kyoto Encyclopedia of Genes and Genomes (KEGG), SwissProt, Gene Ontology (GO) and Clusters of Orthologous Groups (COG) annotations provided information on the specific functions of encoded proteins. A total of 21 monooxygenase and 22 dioxygenase genes were found in its genome. Synteny comparison with the genome ofStreptomyces coelicolorA3(2) revealed a low overall genetic diversity between them. This study provides valuable information to reveal the underlying mechanisms on PE degradation byS. albogriseolusLBX-2.Keywords:Streptomyces albogriseolusLBX-2;polyethylene biodegradation;genome;synteny comparison
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Journal of Cancer Research and Therapeutics
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2020
·Vol. 16
·期 2
·209
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IF 1.326
Yu Haipeng,Zhu Bolan,Yang Wan,Zhang Qian,Wang Wei,Zhai Weichun,Lu Lixia,Zheng Ying,Dang Zheng,Li Bin,Li Chuyi,Liang Bin,Zhang Jiucong,Yu Xiaohui
Objective: To research the effect of matrine on the proliferation and migration of HepG2 cells through extracellular signal-regulated kinase 1/2 (ERK1/2) signaling pathway. Methods: HepG2 cell was selected and divided into blank control group, experimental group ( matrine 1, 2, and 4 mg/mL), and positive control group (PD98059, ERK1/2 inhibitor). MTT measure was used to detect the effective time and concentration which matrine inhibits HepG2 cells. After 24 h, the effect of effective concentration of matrine on the of morphological changing HepG2 cells was observed. The invasion ability was assayed by transwell method, the expression of ERK1/2 and pERK1/2 were detected through Western blot, and reverse transcription polymerase chain reaction was used to test the expression level of ERK1/2 mRNA. Results: With the increase of matrine concentration, the number of adherent HepG2 cells gradually decreased, the morphologic changes gradually became spherical, some cell morphology was incomplete, and even cell fragments appeared. The proliferation and invasion ability of HepG2 cells decreased. The expression of ERK1/2, pERK1/2, and ERK1/2 mRNA downregulated with the increase of matrine concentration (P < 0.05). Conclusion: Matrine inhibits the proliferation and migration of HepG2 cells by downregulating the ERK1/2 signaling pathway.
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Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 44
·6994-7005
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IF 5.047
Pengchong Wang,Yan Yan,Ying Sun,Rui Zhang,Chuanchuan Huo,Lu Li,Ke Wang,Yalin Dong,Jianfeng Xing
The transgelin-2 (TAGLN2) protein plays an important role in multidrug resistance in human breast cancer. siRNA mediated gene silencing of TAGLN2 is a promising strategy for paclitaxel resistance reversal in breast cancer. In this study, a series of bioreducible and acid-labile polydiethylenetriamines (PDs) with different proportions of cross-linkers were synthesized. TAGLN2 siRNA was condensed by PDs to form dual-responsive nanocomplexes, and these nanocomplexes were hypothesized to partially degrade in the acidic environment of endosomes, and then completely degrade in the reducing environment of the cytoplasm to release siRNA. It was found that PDs have good water solubility, acid–base buffering capacity, suitable degradability and high biocompatibility. Moreover, PDCKM can deliver TAGLN2 siRNA into MCF-7/PTX cells and inhibit the expression of TAGLN2 even better than PEI 25k. Besides, paclitaxel showed higher cytotoxicity in cells incubated with PDCKM/TAGLN2 siRNA nanocomplexes. These results suggested that PDs have great potential for safe and efficient siRNA delivery to reverse paclitaxel resistance in breast cancer.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
·
IF 2.931
Yanhua He,Youwei Yu,Xiaoye Wen,Yan Shi,Jianhu Wu,Zhengping Guan,Meilin Cui,Chunling Xiao
A sensitive, efficient and quencher-free fluorescence aptasensor to detect Ochratoxin A (OTA) based on aptamer , 2-aminopurine (2AP) labeled Oligonucleotide sequence, as well as exonuclease I (Exo I) activity was developed. In which the aptamer specific to OTA was modified into a hairpin structure, and 8 bases at the 3′ ends are exposed (H); also, 2AP is embedded in the oligonucleotide complementary to the 8 bases (2AP-probe).The detection principle based on 2AP-probe could be bonded to its complementary sequence and quenches the fluorescence of 2AP; The aptamer has a stronger affinity for the target than its complementary sequence; Exo I can dissociate single-stranded DNA and has little effect on double-stranded DNA as well as folded DNA. In the absence of OTA, the fluorescence of 2AP is quenched due to the complementary pairing of H and 2AP-probe; in the presence of OTA, H selective binding target is detached from 2AP-probe, and the fluorescence of 2AP is slightly restored. Moreover, when the Exo I is added to the detection system, 2AP-probe is dissociated by the Exo I to release the free 2AP, and the fluorescence of the system is further enhanced thereby realizing the detection of OTA. The detection limit of the aptasensor was low as 0.03 nM with a linear range of 0.5–100 nM. Moreover, the aptasensor has good selectivity and practicability and also has good potential in realizing the detection of toxic and harmful substances in food complex matrices.
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JOURNAL OF BIOTECHNOLOGY
·
2019
·
IF 3.163
Xue-Ying Zhang,Xiao-Yang Ou,Yi-Jing Fu,Min-Hua Zong,Ning Li
Catalytic transformation of biomass-derived furans into value-added chemicals and biofuels has received considerable interest recently. In this work, aldehyde dehydrogenases (ALDHs) were identified from Comamonas testosteroni SC1588 for the oxidation of bio-based furans into furan carboxylic acids. Of the whole-cell biocatalysts constructed, Escherichia coli expressing a vanillin dehydrogenase ( E. coli _CtVDH1) proved to be the best for the oxidation of 5-hydroxymethylfurfural (HMF). 5-Hydroxymethyl-2-furancarboxylic acid (HMFCA) was obtained in the yield of approximately 92 % within 12 h using this recombinant strain when the HMF concentration was up to 200 mM. In a fed-batch process, 292 mM of HMFCA was produced within 20.5 h, thereby providing a productivity as high as 2.0 g/L h. Other furan carboxylic acids were synthesized in the yields of 83–95%. Besides, the partially purified HMF was smoothly converted into HMFCA by this recombinant strain, with a 90% yield.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Hongyu Cen,Jiaojiao Cao,Zhenyu Chen,Xingpeng Guo
The corrosion inhibition performance of 2-mercaptobenzothiazole (MBTH) for carbon steel in a CO 2 -H 2 O system was investigated by weight loss, surface analysis, electrochemical measurements, and quantum chemical calculations. Results showed that MBTH could effectively protect carbon steel from CO 2 corrosion and inhibition efficiency of MBTH in supercritical CO 2 was higher than that in non-supercritical CO 2 situation. The differential capacitance curves revealed that excess positive charges would be on the surface of carbon steel in the supercritical-CO 2 system while negative charges accumulated on carbon steel surface in non-supercritical CO 2 condition. The adsorption model was proposed to explain the inhibition mechanism of MBTH.
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CRYSTAL GROWTH & DESIGN
·
2019
·
IF 4.153
Yuting Liu,Mingtao Zhang,Danrui Xu,Sean Parkin,Tonglei Li,Conggang Li,Zhaoyong Yang,Faquan Yu,Sihui Long
To probe the effect of substituent size and isomerization on the polymorphism of fenamic acid (FA) derivatives, we synthesized two FA analogues, namely, 2-(naphthalen-1-ylamino)-benzoic acid and 2-(naphthalen-2-ylamino)-benzoic acid (NBAs), and investigated their polymorphism. Contrary to the lack of polymorphism in FA, we discovered two crystal forms (1-I, 1-II, 2-I, and 2-II) for each of the two compounds. We characterized the two polymorphic systems with single-crystal X-ray diffraction, powder X-ray diffraction, and infrared and Raman spectroscopy, and observed certain structural similarities between 1-I and 2-I. The phase behavior of these two systems were studied with differential scanning calorimetry. Computational studies such as the search for stable conformers, lattice-energy calculations, and Hirshfeld surface analysis were performed to shed light on the polymorphism, relative stability of the forms in each system, and contribution of intermolecular interactions to the overall stability of the systems. The study confirmed the effect of substituent size on the polymorphism of the compounds.
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JOURNAL OF MICROBIOLOGICAL METHODS
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2019
·
IF 1.803
Hai-Feng Hu,Hai-Yan Zhou,Mei-Xin Wang,Yuan-Shan Wang,Ya-Ping Xue,Yu-Guo Zheng
( R )-2-(4-hydroxyphenoxy)propionic acid (( R )-HPOPA) is an important intermediate for the synthesis of optically pure aryloxyphenoxypropionic acid herbicides. Regioselective hydroxylation of ( R )-2-phenoxypropionic acid (( R )-POPA) by microbes is one of the most useful methods for the industrial production of ( R )-HPOPA. In this study, we designed and optimized a rapid throughput assay for screening ( R )-HPOPA producing bacterial/fungal strains which can regioselectively hydroxylate ( R )-POPA. ( R )-HPOPA could react with 4-aminoantipyrine (4-AAP) in the presence of potassium hexacyanoferrate (K 3 [Fe(CN) 6 ]) to form indoxyl antipyrine, an orange-red chromophore, that can easily spectrophotometrically be determined at 550 nm. During the verification of the assay we observed an average recovery rate of between 97.3% and 104.5%. Apart from the rapid throughput, no obvious differences in detection ( R )-HPOPA in the culture broth samples were found between our rapid throughput multiplate assay and a high-performance liquid chromatography method. Our optimized assay method is simple, rapid and accurate with high repeatability. It has the potential for high throughput screening (about 3000–5000 samples/day) of the ( R )-HPOPA producing strains.
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