Nanoscale
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2021
·Vol. 13
·期 16
·7801-7809
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IF 7.79
Wanguo Gao,Xiaoman Li,Xu Zhang,Senda Su,Shijian Luo,Rong Huang,Yuan Jing,Min Luo
The vacancies of semiconductors have proven to be effective active sites for photocatalytic nitrogen fixation, but what about the role of defects in MOF materials? Herein, we report the first UiO-66 with photo-excited cluster defects and linker defects for photocatalytic nitrogen fixation. It was determined through the post-synthetic ligand exchange (PSE) process that the linker defects, rather than cluster defects, can greatly improve the performance, which is due to linker defects forming unsaturated metal nodes such as the vacancy in a semiconductor. Specifically, for photo-activated UiO-66, the NH4+ production rate was 196 and 68 μmol g−1 h−1 in air atmosphere under ultraviolet-visible (UV-Vis) and visible light, respectively. This report provides a new effective strategy to design efficient nitrogen fixation photocatalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Rui Duan,Chao Peng,Lu Sun,Lu-Xia Zhang,Chen-Chen Bai,Lin-Yi Dong,Xian-Hua Wang
Immunoassay plays a leading role for specific and sensitive detection of glycoprotein, in which antibodies and high-sensitivity methods are usually used for specific recognition and signal output, respectively. However, antibodies are usually costly, unstable, and poorly reproducible, and traditional signal output methods have different disadvantages. Here, we integrated boronate affinity controllable-oriented surface imprinting nylon wire (BAC-OSINW) and allochroic-graphene oxide (AGO) for fast, sensitive and specific detection of glycoprotein. The state-of-the-art detection strategy depended on the ELISA-like immunosandwich principle. The target glycoprotein is first specifically captured by the BAC-OSINW based on molecularly imprinted recognition, and then labeled by AGO, which can specifically recognize the cis -diol of glycoprotein under physiological pH, and performed signal output by pH-triggered allochroism. Compared with the commercial enzyme-linked immunosorbent assay (ELISA), the proposed method herein exhibits lower limit of detection (LOD), wider linear range, lower sample volume requirement, lower cost, less time-consuming, and can be reused. The proposed detection method has universal applicability, and provides ultrahigh sensitivity, yielding a LOD of 0.86 ng mL −1 and 24 pg mL −1 for transferrin and leukaemia inhibitory factor, respectively. Therefore, this cost-efficient and easy-to-use approach possesses great prospect in many applications, particularly in early clinical cancer diagnosis.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Xiaohong He,Kun Jia,Yun Bai,Zhongyuan Chen,Yiyao Liu,Yumin Huang,Xiaobo Liu
Simultaneous detection of multiple heavy metal ions (HMI) is of great importance for the environmental monitoring, and the analytical tools based on multiband emissive fluorescent probes have been regarded as one of the most promising candidate for multiple HMI detection. Herein, the rod-coil amphiphilic block copolymer (BCP) with intrinsic blue fluorescence emission has been synthesized and subsequently employed to encapsulate two types of hydrophobic quantum dots (QD) with green and red fluorescence emission via the three dimensionally confined emulsion self-assembly, leading to the generation of white-emitting superparticles showing good colloidal stability and stable aqueous phase fluorescence. Furthermore, it was found that the fluorescence emission intensity of obtained superparticles can be selectively quenched by Ag + , Hg 2+ , Cu 2+ and Fe 3+ ions via different mechanisms, and the four metal ions can be further discriminated according to their distinct combinational quenching effects onto three fluorescent bands of white-emitting superparticles. In addition, an analytical model was built to enable the simultaneous detection of Cu 2+ , Hg 2+ and Fe 3+ in the real sample. Basically, the current work opens the new way to fabricate fluorescent probes with multiple emission bands, which can be easily adapted to prepare more complicated QD encoded fluorescent probes for high throughput detection.
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MOLECULES
·
2020
·Vol. 25
·期 5
·1157
·
IF 3.267
Sha Cong,Wenjiang Dong,Jianping Zhao,Rongsuo Hu,Yuzhou Long,Xiaoxing Chi
The lipid oxidation process of Robusta green coffee beans was characterized during accelerated storage for 20 days at 40 °C, 50 °C, and 60 °C. The conventional oxidation indexes and fatty acid compositions were evaluated, and the shelf life of the green coffee beans was predicted using the Arrhenius model. The acid value, iodine value, peroxide value, total oxidation value, thiobarbituric acid reactive substances, and free fatty acid content increased throughout storage, while the moisture content,p-anisidine value, and unsaturated fatty acid content decreased, which suggests that lipid oxidation occurred during accelerated storage. The predicted shelf life of green coffee bean samples were 57.39 days, 44.44 days, and 23.12 days when stored at 40 °C, 50 °C, and 60 °C, respectively. This study provided scientific evidence of the impact of lipid oxidation on the loss of quality during the accelerated storage of green coffee beans.Keywords:green coffee beans;lipid oxidation;accelerated storage;shelf life prediction
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Food Bioscience
·
2020
·
IF 3.067
Xiao-Hui Yao,Yu-Shi Shen,Run-Ze Hu,Ming Xu,Jia-Xing Huang,Chen-Xi He,Fu-Liang Cao,Yu-Jie Fu,Dong-Yang Zhang,Wei-Guo Zhao,Li Liu,Tao Chen
Mulberry is a traditional crop that has been grown in China for thousands of years. While leaves and fruits of the mulberry have been consumed, mulberry seed use has been less extensive. The goal of this study was to investigate the value of the seeds. Seven cultivars of mulberry were investigated. Oil was extracted from seeds, and the oil content was determined. The primary components of the oils were analyzed using gas chromatography . It was found that all the mulberry cultivars contained high linoleic acid contents, suggesting that mulberry seed may be a potential resource of linoleic acid. The total phenolic and flavonoid contents were also compared among different mulberry seed oils . The physical and chemical parameters, as well as the antioxidant activity of the mulberry seed, were determined. Principal component analysis indicated that the ferric ion reducing antioxidant power (FRAP) and 2,2-diphenyl-1-picrylhydrazyl free radical-scavenging activity (DPPH) of mulberry seed oil may be due to high phenolic compounds and linoleic acid. The cultivars Dongsheng, Fengtian, and Guisang had the highest antioxidant activities (FRAP, DPPH), and it was proposed that these cultivars would produce the highest quality oil for use as an ingredient for healthcare or functional food use.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Yongfeng Mu,Han Feng,Shuling Zhang,Chongyang Zhang,Nan Lu,Jiashuang Luan,Guibin Wang
Hybridization has become a powerful toolbox for developing ultrafiltration membranes with superior properties. However, it remains challenging to give full play to the utility of nanofillers because of poor bonding strength between polymers and inorganic nanomaterials . Herein, hydroxyapatite nanotubes (HANTs) were modified via bio-inspired polydopamine (PDA) and polyethylenimine (PEI) co-deposition. Meanwhile, polysulfone with carboxylation degree of 30% (PSF-COOH-30%) was synthesized by nucleophilic substitution reaction and employed as the membrane matrix. The results showed that when 0.3 wt% HANTs@PDA/PEI was incorporated, the pure water flux of the hybrid membrane achieved about 3.2 times that of the unfilled membrane and the rejection rate of bovine serum albumin (BSA) and humic acid (HA) remained 94.5% and 97.8%, respectively. Meanwhile, the flux recovery ratio for BSA and HA solutions (1 g/L) reached 90.8% and 93.7%, respectively. Specifically, the superiority of UF performance benefited from the synergistic effect of both the carboxylated polymer and the nanofiller. On one hand, the incorporation of HANTs@PDA/PEI promoted the formation of more porous membrane structure and improved the hydrophilicity of the membrane. On the other hand, due to the existence of COOH, the electrostatic repulsion between the membranes and contaminants enhanced the fouling resistance for BSA and HA. Conspicuously, the ease and versatility of co-deposition provide new ideas in the construction of nanohybrid and the favorable improvement renders that appropriate combination of polymer and additive is an effective way for developing future ultrafiltration membranes.
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JOURNAL OF MEMBRANE SCIENCE
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2020
·
IF 7.183
Xiangwen Zhang,Yi Li,Xin Liu,Junfeng Zhang,Yan Yin,Michael D. Guiver
A new class of proton exchange membranes (PEMs) containing ferrocyanide groups as both proton-conducting/radical scavenger components are fabricated. Here, the ferrocyanide groups are bonded to a commercial fluoroelastomer polymer main chain, resulting in ferrocyanide-coordinated PEMs (CFC) for proton exchange membrane fuel cells (PEMFCs). The CFC PEMs show a larger hydrophilic morphological phase than Nafion 212 membrane, even in the CFC having lower ion exchange capacity, owing to stronger electrostatic forces among ferrocyanide groups than traditional sulfonic groups. Compared with Nafion 212, CFC membranes present inferior proton conductivity in water. However, they show much lower activation energy for proton transport in water, and considerably higher proton conductivity than Nafion 212 under low relative humidity (RH). This is related to the larger hydrophilic domains that may construct better-connected channels for proton transport, especially at low membrane hydration levels. As a result, CFC membranes exhibit better power output than Nafion 212 in PEMFC evaluations under low RH conditions. The chemical accelerated stress test (AST) demonstrates that the radical scavenging ability of ferrocyanide group is effective for greatly reducing electrochemical oxidation .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Yanling Shen,Hong Yan,Hua Guo,Yumei Long,Weifeng Li
A new electrochemical sensor has been developed for the simultaneous determination of 4-aminophenol (4-AP) and phenol (Ph) based on the defect-rich hexagonal boron nitride (D-h-BN). The D-h-BN was prepared via one-step calcination route using a single-source precursor. The obtained D-h-BN was structurally characterized by X-ray diffraction (XRD), fourier transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM). Photoluminescent (PL) result suggested that the as-synthesized h-BN was highly defective. More interestingly, such D-h-BN exhibited favorable electrocatalytic activity in the redox reaction of Ph and 4-AP, which was confirmed by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) measurements. The enhanced electrocatalytic activity of D-h-BN was attributed to its large surface-active sites and fast electron transfer mediated by defect structure. Thus, D-h-BN was employed to modify glassy carbon electrode (GCE) without any binder agents and the as-fabricated sensor showed good electrochemical performances in the simultaneous determination of 4-AP and Ph. By using DPV method, the linear detection ranges between concentrations and current intensities for 4-AP and Ph were 0.01–30 and 0.1–30 μM, respectively, and their detection limits (S/N = 3) were estimated to be 0.003 and 0.035 μM. Moreover, the desirable selectivity and reproducibility make the proposed method successfully applied for real sample assay.
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SOLID STATE SCIENCES
·
2019
·
IF 2.155
Jinyi Zhang,Jing Zuo,Yinshan Jiang,Dandan Zhu,Jiupeng Zhang,Cundi Wei
Coal gasification slag is abundant of unburned carbon and inorganic matters such as silica , alumina and calcium oxide. The mesoporous structure of coal gasification slag can be produced by acid leaching of metal ions. Therefore, it is very important to study the acid leaching process of coal gasification slag. At the same time, in order to broaden the application fields of coal gasification slag, the thermal stability of the as-prepared pore structure should meet the requirements of various occasions. Using coal gasification coarse slag (CS) and coal gasification fine slag (FS) as raw materials, this study investigated the kinetic characteristics of mesoporous formation and optimized the acid leaching conditions. The results of BET, BJH, SEM, XPS and chemical tests showed that under the condition of acid-ash ratio (molar ratio) of 1.0, liquid-solid ratio (volume/mass) of 4:1 and acid leaching temperature of 90 °C, the formation of mesoporous structure by acid leaching was a process of first-order kinetic reaction. According to the analysis of XRD , it was found that the thermal stability of both CS and FS had been greatly improved after acid leaching because of the siliceous enrichment.
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CHEMICAL PHYSICS
·
2019
·
IF 1.822
Lin Zhang,Huaiyang Jin,Chunhui Shen,Shanjun Gao
Novel proton exchange membranes of sulfonated poly (ether-ether-ketone)/phosphonic acid-functionalized siloxane were prepared by sol–gel method using sulfonated poly (ether-ether-ketone) as the matrix and phosphonic acid-functionalized siloxane as the crosslinking agent. Phosphonic acid-functionalized siloxane was prepared from tetra sodium of 1-hydroxyethane-1, 1-diphosphonic acid (HEDP·Na 4 ) and 3-isocyanatopropyltriethoxysilane (IPTES). The FTIR results suggest that HEDP·Na 4 was anchored into IPTES and Si-O-Si crosslinked network was formed successfully. The prepared membranes were stable up to 220 °C without any degradation and exhibited excellent dimensional stability and mechanical performance. The proton conductivity of the AES-X increased with the increase of phosphonic acid groups, especially for AES-3, 4, of which the proton conductivity was higher than that of Nafion117 at 80 °C and the proton conductivity of AES-3 was up to 0.0378 S cm −1 under 140 °C. The power density of the DMFC MEA fabricated with the AES-3 could reach 157 mW cm −2 at 60 °C.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Ziyan Chen,Yan Zhao,Mengke Zhang,Xiufang Yang,Pengxiang Yue,Dikang Tang,Xinlin Wei
A new polysaccharide (pFSP) was first isolated from the originally discarded fibrous roots part of Chinese traditional herb, Bletilla striata. pFSP was composed of D-glucose, D-galactose and D-mannose in a molar ratio of 1: 2.03: 3.45 with molecular weight of 9.1 × 10 4 Da. It could effectively scavenge DPPH and superoxide radicals with inhibition rate of 64.47% and 72.27% at 5.0 mg/ml, higher than that of polysaccharide from Bletilla striata tuber. Structural investigations of the periodate oxidation studies and Smith-degradation as well as the FT-IR spectroscopy were performed, and combined with 1D and 2D NMR spectroscopy, the repeating unit of pFSP contained (1→4)-linked-α-D-Glcp, (1→4)-linked-β-D-Manp and (1→3,6)-linked-β-D-Manp units, together with the branches of (1→6)-linked-β-D-Galp and terminated with (1→)-linked-β-D-Manp residue.
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Materials Today Communications
·
2022
·
IF 3.662
Yipeng Zhang,Jianping Zhang,Zechun Liu,Yanjun Huang,Xiaopeng Xiong
Beta-cyclodextrin (β-CD) has promising applications in many fields based on its hydrophobic cavity at the central of the cyclic molecule, which can form inclusion complex with specific molecule via a host-guest interaction. However, the water solubility of β-CD limits its application. Herein, attempts have been made to graft β-CD onto two kinds of solid particles while retaining the function of β-CD, so as to expand its application. First, SiO 2 nanoparticles were modified with silane coupling agent KH-560 to offer epoxy groups. Then, the epoxy groups of the modified SiO 2 and the hydroxyl groups of β-CD were simultaneously esterified by a dicarboxylic acid of succinic acid in a non-toxic solvent medium to obtain the β-CD modified SiO 2 (SiO 2 @β-CD). On the other hand, microcrystalline cellulose (MCC) particles were also modified with β-CD (MCC@β-CD) through co-esterification of their hydroxyl groups with succinic acid. The syntheses were monitored by Fourier transform infrared (FT-IR) spectroscopy, and the obtained materials were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The degrees of β-CD modification for the particles have been measured and analyzed to optimize the synthesis conditions. The results indicate that the degree of β-CD modification for the SiO 2 @β-CD is relatively low, but the material exhibits over 60 ºC elevation of the thermal stability. In comparison, the degree of β-CD modification for MCC@β-CD reached as high as 422 mg/g. Due to the much higher content of β-CD, the synthesized MCC@β-CD was employed to load a flavor compound of D -limonene, and its sustained release was investigated to suggest the potential of the β-CD modified particles.
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