CHEMICAL PAPERS
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2018
·Vol. 72
·期 9
·2203-2214
·
IF 0.963
Sun Qian,Song Xueying,Gao Li,Chen Wei,Li Yamin,Mao Liqun,Yang Jing-He
The series of graphene materials and N-doped graphene materials were successfully synthesized and improved by high-temperature treatment with trace iron oxide. XRD, Raman, FT-IR, TEM and XPS were employed for these catalysts. The catalytic performance of these catalysts was investigated in the selective oxidation of ethylbenzene with tert -butyl hydroperoxide as oxidant. The impacts of temperature, mass of catalysts, reaction time and oxidants on the selective oxidation of ethylbenzene were also investigated. The N-doped graphene materials exhibit greatly remarkable catalytic performance than others. The conversion of ethylbenzene is more than 90% and the selectivity of acetophenone is more than 95% at 353 K. Graphene can be used as catalyst owing to its unique structures and chemical properties. The characterization tests show that the doping of N atoms can create more defects and more active sites in the N-doped graphene materials which could greatly improve the catalytic performance. Furthermore, such cost-effective graphene-based catalysts possess good stability and could be reused at least five times without remarkable loss of the catalytic activity.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2018
·Vol. 34
·期 2
·197-202
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IF 1.248
Li Jing,Liu Hongwei,Meng Fanyu,Yan Liuqing,Shi Yanpeng,Zhang Yumin,Gu Qiang
A comparison synthesis of 1,2,3-triazoles bearing isoxazole ether was developed between conventional and microwave-assisted heating. Single/double 1,2,3-triazoles bearing isoxazole ether were synthesized by click reaction starting from substituted isoxazolyl alkyne compounds and substituted benzyl azide compounds or neopen-tylglycol diazide in the presence of copper(I) that in-situ generated. Herein, the effect of different catalysts on the yield was researched by conventional method, and the optimal catalyst was selected. The structures of all the synthe-sized compounds were confirmed by MS, FTIR, 1 H and 13 C NMR spectroscopies. Moreover, the crystal structure of 5-{[(1-benzyl-1 H -1,2,3-triazol-4-yl)methoxy]methyl}-3-(4-fluorophenyl)isoxazole( 2 h) was determined.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 15
·14486-14498
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IF 2.8
Song Chengjie,Fan Mingshan,Shi Weidong,Wang Wei
We have successfully synthesized the composites of two-phase g-C 3 N 4 heterojunction photocatalysts by one-step method. And the reduced graphene oxide/two-phase g-C 3 N 4 heterojunction photocatalyst was fabricated via a facile hydrothermal reduction method. The characterization results indicated that the two-phase g-C 3 N 4 was integrated closely, and the common phenomenon of agglomeration for g-C 3 N 4 was significantly reduced. Moreover, the oxidized graphene was reduced successfully in the composites and the graphene was overlaid on the surface or the interlayers of g-C 3 N 4 heterojunction composite uniformly. In addition, we have carried out the photocatalytic activity experiments by H 2 evolution and rhodamine B removal, tetracycline removal under the visible light irradiation. The results revealed that the composite has improved the separation efficiency a lot than the pure photocatalyst. The photocurrent test demonstrated that the recombination of electrons and holes were efficiently inhibited as well as enhanced the photocatalytic activity. The 0.4% rGO loaded samples, 0.4% rGOCN2, own the best performance. Its rate of H 2 evolution was 15 times as high as that of the pure g-C 3 N 4 .
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Nanoscale Research Letters
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2018
·Vol. 13
·期 1
·1-10
·
IF 3.125
Zou Shenqiang,Zhu Xiaofang,Zhang Lirong,Guo Fan,Zhang Miaomiao,Tan Youwen,Gong Aihua,Fang Zhengzou,Ju Huixiang,Wu Chaoyang,Du Fengyi
Cerium oxide nanoparticles recently have received extensive attention in biomedical applications due to their excellent anti-oxidation performance. In this study, a simple, mild, and green approach was developed to synthesize cerium-doped carbonaceous nanoparticles (Ce-doped CNPs) using bio-mineralization of bull serum albumin (BSA) as precursor. The resultant Ce-doped CNPs exhibited uniform and ultrasmall morphology with an average size of 14.7 nm. XPS and FTIR results revealed the presence of hydrophilic group on the surface of Ce-doped CNPs, which resulted in excellent dispersity in water. The CCK-8 assay demonstrated that Ce-doped CNPs possessed favorable biocompatibility and negligible cytotoxicity. Using H 2 O 2 -induced reactive oxygen species (ROS) as model, Ce-doped CNPs showed highly hydroxyl radical scavenging capability. Furthermore, flow cytometry and live-dead staining results indicated that Ce-doped CNPs protected cells from H 2 O 2 -induced damage in a dose-dependent effect, which provided a direct evidence for anti-oxidative performance. These findings suggest that Ce-doped CNPs as novel ROS scavengers may provide a potential therapeutic prospect in treating diseases associated with oxidative stress.
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CATALYSIS LETTERS
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2018
·Vol. 148
·期 6
·1739-1749
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IF 2.911
Wang Hongli,Gao Dawei,Wang Liying,Chi Yue,Wang Minggang,Gu Yan,Wang Cong,Zhao Zhankui
Abstract The effective storage and generation of hydrogen at room temperature is an important issue in many areas, including alternative energy. In this work, NiCoB nanoalloys with high B contents, clean surfaces, and good dispersions are synthesized by an in-situ reduction method. The NiCoB catalyst with high B content exhibits significantly more excellent catalytic activity for hydrogen generation from the hydrolytic of ammonia borane than NiCoB catalyst with low B content. The remarkable catalytic performance is attributed to the strong electronic interaction between the incorporated B and the active metal sites of Co and Ni, the clean surface and good dispersion of the catalyst. Basically, the physical and catalytic properties of the catalyst take advantage of the selection of reductant used during the in-situ synthesis of the NiCoB nanoalloys. This work demonstrates that this facile synthetic method is a promising avenue for the rational design of various B incorporated metal catalysts for hydrogen energy exploitation, metal/air batteries, and electrochemical sensors. Graphical Abstract
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MICROCHIMICA ACTA
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2018
·Vol. 185
·期 11
·1-9
·
IF 5.705
He Lifang,Bao Zhijun,Zhang Kui,Yang Danting,Sheng Bingbing,Huang Rui,Zhao Ting,Liang Xiaochen,Yang Xingjie,Yang Annan,Zhang Cheng,Cui Ping,Zapien Juan Antonio,Zhou Haibo
A ratiometric probe is described for the fluorometric determination of Cu(II) ions based on their quenching effect on the luminescence of dually-emitting quantum dots (QDs). ZnS QDs were doped with Mn(II) and subsequently modified with mercaptopropionic acid to give the QD probe which consists of a sole fluorophore but has two emission peaks (at 430 and 590 nm under 310 nm excitation, respectively). On addition of Cu(II) ions, the 590 nm band is quenched while the 430 nm band exhibits a little change. The changes in the intensity ratios of the yellow and the purple bands increases linearly in the 0 to 3.0 μM Cu(II) concentration range, and the detection limit reached 14 nM. The QD probe was validated and successfully applied to the determination of Cu(II) in spiked real water samples.
Mn-doped ZnS (ZnS:Mn(II)) quantum dots were synthesized with yellow fluorescence. After the modification of 3-mercaptopropionic acid (MPA), ZnS:Mn(II) was transferred to aqueous phase and became MPA modified Mn-doped ZnS (MPA- ZnS:Mn(II)). The fluorescence was changed to purple upon the addition of copper ions because the yellow band was largely quenched while the purple band only changed a little.
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 4
·3331-3341
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IF 2.993
Han Shuang,Su Liqiang,Zhai Minghui,Ma Lin,Liu Shiwei,Teng Yue
Conventional cancer chemotherapy presents relevant limitations associated with the non-selectivity of cytotoxic drugs, their narrow therapeutic indices and limited cellular penetration. Molecularly imprinted polymers (MIP) prepared using molecular imprinted technology has the advantages such as high stability against chemical and enzymatic attack, high selectivity for a specific template, and the capability of resistance to harsh environment. In this research, the MIP with cancer antigen 125 (CA125) tumor markers as template molecule, combined with molecular imprinting technique was prepared on the surface of graphene oxide for drug delivery. As a result the prepared composite had the properties of specific binding to CA125 and biocompatibility. Along with this, the composites could target specific tumor cell by the capture of CA125. CA125-molecularly imprinted polymers as a recognition element for the tumor cell could eliminate the use of antibody, enhance stability and prolong the retention time of drugs surrounding them. Ultimately, this method developed a cost-effective and stable way to target tumor cell for drug delivery.
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 2
·1640-1653
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IF 2.993
Yang Xiao-Bing,Meng Ling-Hui,Sui Xu-Lei,Wang Zhen-Bo
A novel polybenzimidazole (PBI) proton exchange membrane based on phosphotungstic acid (PWA)-anchored nano-Kevlar fibers (NKFs) has been successfully prepared by solution casting. Employing NKFs instead of frequently used oxide support as anchoring agent has effectively conquered the problem of the poor interface compatibility between the inorganic component and the polymer, resulting in the excellent dispersion of PWA in the matrix and providing favorable conditions for the formation of consecutive proton transport channels. The as-obtained PBI/NKFs@PWA membrane exhibits proton conductivities as high as 0.029 and 0.051 S cm −1 at 20 and 80 °C without extra humidity, respectively. And benefit from the undetectable leakage of PWA, the proton conductivity retention could achieve 93.16% within 500 h. Simultaneously, the methanol barrier property of the hybrid membrane is far beyond Nafion, indicating a membrane selectivity of 12.08 × 10 4 S (s cm −3 ), which is 8.21 times higher than that of Nafion 115. The hybrid membrane allowed for sufficient proton conductivity, robust stability, lower methanol permeability, as well as low cost compared with Nafion, shows great potential for direct methanol fuel cell applications.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2018
·Vol. 319
·期 1
·69-73
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IF 1.181
Duan Xiaoyan,Li Jianbo,Lu Xiaoling
In the field of nanotechnology, DNA-based nanoscale materials have facilitated the construction of DNA polyhedrons with different shapes and sizes by using predictable base pairing and highly tunable conformation. In this study DNA bipyramid nanostructures with one arm chain (T20-DBNs) were successfully prepared in a single annealing procedure. 99m Tc-A20 ssDNA was obtained by radiolabeled DTPA-A20 with 99m Tc, and then 99m Tc-DTPA-DBNs were obtained by hybridizing T20-DBNs with 99m Tc-A20 ssDNA. We focused on studying a method of 99m Tc radiolabeling DNA nanostructures with DTPA as a chelate, and hoped to develop a new SPECT molecular imaging probe based on DNA nanostructures.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 24
·20580-20587
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IF 2.324
Fang Lu,Xue Yan,Hu Xing-Ming,Xie Dong,Li Wen-Jun
Electrochemiluminescence (ECL) is a very sensitive method for trace analysis because of its background interference and high signal-to-noise ratio. In the past decade, the determination of Cu 2+ in environment has attracted considerable attention since it plays an essential role in many physiological processes. Herein, a novel ECL sensor based on C,N quantum dots embedded g-C 3 N 4 nanosheets (C,N-QDs@NSs) was constructed for the detection of Cu 2+ . The nanocomposite was rapidly obtained via the oxidation of normal g-C 3 N 4 in H 2 O 2 solution using sonochemical synthesizing method. Due to the abundant surface defects on C,N-QDs@NSs, the ECL intensity was magnified 2.5 times for using a C,N-QDs@NSs electrode in comparision to a g-C 3 N 4 modified electrode. Besides, C,N-QDs@NSs could accelerate the rate of electron transfer in ECL reaction and thus resulted in the lower cathodic peak potential. Significantly, Cu 2+ could effectively quench the ECL of C,N-QD@NSs, which endowed C,N-QD@NSs with a great advantage in the ECL detection of Cu 2+ . under optimum conditions, C,N-QDs@NSs modified electrode exhibited a linear detection range from 5 × 10 −4 to 10 µM with a detection limit of 2 × 10 −4 µM (S/N = 3) for Cu 2+ , and was finally applied to detect Cu 2+ in real samples with satisfactory results.
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WATER AIR AND SOIL POLLUTION
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2018
·Vol. 229
·期 4
·1-10
·
IF 1.769
Dai Ying,Lv Riwen,Huang Dejuan,Tao Qinqin
Humic acid (HA) plays an important role in the migration and transformation of uranium in natural waters. To effectively remove uranium in the presence of HA, a bifunctional polymer, diethylenetriaminepentaacetic acid cross-linked β -cyclodextrin (DTPA- β -CD), was synthesized by polycondensation reaction. The sorption performance of DTPA- β -CD in functions of pH, ionic strength, contact time, initial time, and temperature were explored batch wise. Experimental results showed that DTPA- β -CD could concurrently sorb uranium and HA around pH of 3.0. The sorption strongly depended on pH and on ionic strength, demonstrating outer-sphere surface complex in nature. Two sorption kinetics well followed pseudo-second-order model. Sorption isotherm accorded with Sips model. Increasing temperature facilitated uranium and restrained HA sorption. This work demonstrated that DTPA- β -CD was a promising material for sorbing uranium in the presence of HA.
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BIODEGRADATION
·
2018
·Vol. 29
·期 6
·593-603
·
IF 2.41
Shi Zhoukun,Dong Weiliang,Xin Fengxue,Liu Jiawei,Zhou Xinhai,Xu Fanli,Lv Ziyao,Ma Jiangfeng,Zhang Wenming,Fang Yan,Jiang Min
Abstract An acetamiprid-degrading fungus was isolated from contaminated soil and identified as Fusarium sp. strain CS-3 based on physiological, biochemical, and molecular analyses. Strain CS-3 exploited 50 mg/L as the sole carbon source in liquid culture, removing 98% in 96 h. Strain CS-3 retained its acetamiprid degradation abilities over a wide range of pH (5.0–8.0) and temperature (20–42 °C). HPLC–MS analysis showed that N ′-[(6-chloropyridin-3-yl)methyl]- N -methylacetamide, 2-chloro-5-hydroxymethylpyridine, and 6-chloronicotinic acid were identified as the most predominant metabolites, forming the basis for a newly described acetamiprid degradation pathway. Strain CS-3 efficiently degraded 99.6% of 50 mg/kg acetamiprid in soil, indicating potential for soil remediation. Graphical abstract
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