Journal of Materials Chemistry A
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2019
·Vol. 7
·期 16
·9791-9797
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IF 10.733
Kai Deng,You Xu,Dandan Yang,Xiaoqian Qian,Zechuan Dai,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
The structure- and composition-controlled synthesis of Pt-based nanocatalysts is highly important for improving their catalytic performance while reducing the overall use of precious Pt. Here, an effective strategy is developed to combine surface porosity, hollow cavities and metal–nonmetal incorporation engineering on Pt, resulting in ternary Pt–Ni–P mesoporous nanocages (Pt–Ni–P MNCs). Owing to the mesoporous surface, hollow structure and synergistic electronic effects derived from Pt, Ni, and P elements, the as-prepared Pt–Ni–P MNCs exhibit excellent electrocatalytic activity and long-term stability for both the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR), enabling them to be promising ORR–MOR bifunctional electrocatalysts for direct methanol fuel cells.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Siya Wu,Xu Zhang,Jian Liu,Jianxi Song,Ping Yu,Peichao Chen,Zhiyong Liao,Mingjiang Wu,Haibin Tong
P-selectin, mediated adhesion between endothelium and neutrophils, is a promising target for the therapeutics of acute inflammatory-related diseases. It is reported that brown algal fucoidans can antagonize P-selectin function. However, the fractionation and physicochemical characterization of Sargassum fusiforme fucoidan, and the screening of fucoidan fractions with P-selectin antagonistic capability have not been investigated. In this study, we isolated and fractionated systematically the S. fusiforme fucoidan by ion-exchange chromatography and size exclusion chromatography to obtain eight fucoidan fractions. Their physicochemical characterization was determined by chemical methods, HPLC and FT-IR. The inhibitory capacity of the fucoidan fractions in P-selectin-mediated leukocyte adhesion was evaluated by static adhesion assay and parallel-plate flow chamber. Results showed that fucoidan fractions possessed distinct physicochemical properties, including total carbohydrate, uronic acid and sulfate contents, molecular weight, and monosaccharide compositions. Among all the fucoidan fractions, SFF-32 and SFF-42 showed better blocking ability against P-selectin-mediated cell adhesion.
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JOURNAL OF CATALYSIS
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2019
·
IF 7.723
Yixuan Gao,Shihao Zhang,Yishi Wu,Yang Tian,Hongbing Fu,Sihui Zhan
Photoelectrochemical (PEC) water splitting via semiconductors is an effective and feasible method for synthesizing renewable hydrogen (H 2 ) fuels. In this study, β-In 2 S 3 nanosheets were first grown on conductive glass. Then, we prepared P-doped β-In 2 S 3 nanosheets with an amorphous InPO x overlayer via the incomplete phosphorization of pristine β-In 2 S 3 nanosheets. When we used this material as photoanode in a PEC cell for water splitting, the photocurrent density drastically increased to 2.2 mA cm −2 at 1.23 V versus a reversible hydrogen electrode (vs. RHE). It enhanced 15 times as the pristine β-In 2 S 3 nanosheets, which was only 0.15 mA cm −2 at 1.23 V vs. RHE (solar standard spectrum, 100 mW cm −2 ). The photoelectric conversion efficiency as high as 0.65% at a low potential of 0.81 V vs. RHE was achieved for the phosphorized β-In 2 S 3 nanosheets. A series of experiments proved that the P-doping accelerated semiconductor charge-transport and the InPO x overlayer played cocatalyst role. We penetratingly investigated the pathway of charge transfer via femtosecond transient absorption. The results showed one pathway of charge transfer in pristine β-In 2 S 3 photoanode. However, there were two pathways (core/shell coupling and shallow trap states) for charge transfer in the phosphorized β-In 2 S 3 photoanode, which improved the performance of its PEC water oxidation.
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-13
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IF 12.264
Pan Zhengbin,Han Ershuan,Zheng Jingui,Lu Jing,Wang Xiaolin,Yin Yanbin,Waterhouse Geoffrey I. N.,Wang Xiuguo,Li Peiqiang
Flower-like CeO 2 nanoparticles enhance the performance of CuO nanoparticle/Cu.
The system benefits from the heterojunction between p-type CuO and n-type CeO 2 .
The selective reduction of CO 2 to methanol on the target catalyst is studied.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
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2019
·Vol. 103
·期 21
·8839-8851
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IF 3.67
Liu Yang,Zhu Lingfeng,Qi Wenpeng,Yu Bo
D- p -hydroxyphenylglycine (D-HPG) functions as an intermediate and has important value in antibiotic industries. The high pollution and costs from chemical processes make biotechnological route for D-HPG highly desirable. Here, a whole-cell transformation process by D-hydantoinase(Hase) and D-carbamoylase(Case) was developed to produce D-HPG from DL-hydroxyphenylhydantoin(DL-HPH) in Escherichia coli . The artificially designed ribosome binding site with strong intensity significantly facilitated the protein expression of limiting step enzyme Case. Next, the cell wall permeability was improved by disturbing the peptidoglycan structure by overproduction of D,D-carboxypeptidases without obviously affecting cell growth, to increase the bioavailability of low soluble hydantoin substrate. By fine-tuning regulation of expression level of D,D-carboxypeptidase DacB, the final production yield of D-HPG increased to 100% with 140 mM DL-HPH substrate under the optimized transformation conditions. This is the first example to enhance bio-productivity of chemicals by cell wall engineering and creates a new vision on biotransformation of sparingly soluble substrates. Additionally, the newly demonstrated ‘hydroxyl occupancy’ phenomenon when Case reacts with hydroxyl substrates provides a referential information for the enzyme engineering in future.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2018
·Vol. 317
·期 3
·1235-1241
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IF 1.181
Wang Cheng,Xiao Fang-zhu,Pu Yi-qiu,Xu Yu-li,Xu Dong-yang,Zhang Kang,Liu Yong,Peng Guo-wen
P -carboxyphenyl azo calix[4]arene phosphate derivative (P-CACPD) was successfully synthesized using calix[4]arene as raw material. The P-CACPD was characterized by FT-IR and 1 H-NMR. The effects of pH, extraction time and temperature on the extraction of U(VI) by P-CACPD were investigated. The results show that pH value, extraction time and temperature have an effect on the extraction of U(VI) by P-CACPD. When the initial pH is 5, temperature is 25 °C, extraction time is 2 h, the extraction rate of U(VI) by P-CACPD reaches the maximum. Both kinetics parameters and thermodynamic parameters of the extraction process were calculated. The calculated data indicate that the extraction process of uranium by P-CACPD is an exothermic spontaneous process, which well fits with the pseudo-second-order kinetic model.
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SURFACE & COATINGS TECHNOLOGY
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2018
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IF 2.906
Qilong Zhang,Yongchang Jiang,Enjie Yu,Hui Yang
Core-shell structured BaTiO 3 @polyaniline (BT@PANI) nanoparticles were synthesized via surface hydroxylation and in-situ polymerization method and were embedded into Poly(vinylidene fluoride- co -hexafluoropropylene) [P(VDF-HFP)] matrix. The dielectric performance as well as thermal behavior of BT@PANI/P(VDF-HFP) nanocomposite films are investigated. The crystallinity increases with increasing the BT@PANI content. Compared with BT particles, the BT@PANI core-shell nanoparticles exhibit notable improvement on dielectric properties . Typically, with a filler content of 20 vol% BT@PANI, the dielectric constant of BT@PANI/P(VDF-HFP) composite film reaches 99.1 at 1 kHz, which is 6.2 times larger than that of 20 vol% BT (16.1) and 9.6 times larger than pristine P(VDF-HFP) (10.3). Enhanced permittivity is generated from the interfacial polarization and the microcapacitor effect provided by the core-shell nanoparticles. Moreover, nanocomposite film maintains a low dielectric loss of 0.21 at 1 kHz. This research offers a solution for fabricating dielectric composite with large dielectric constant and low dielectric loss, which could be beneficial for the improvement of advanced electronic devices.
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TALANTA
·
2018
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IF 4.244
Zhiqing Yang,Yi Wang,Dun Zhang,Chao Chen
Using photoelectrochemical (PEC) platform for ultrasensitive detection of sulfate-reducing bacteria (SRB) is a big challenge since sensor sensitive component can be damaged by corrosive metabolites. In this work, a novel bio-etching strategy for sensitizing PEC platform is developed to detect SRB. In the presence of bacterial metabolite (H 2 S), BiOCl platform can be bio-etched to form Bi 2 S 3 /BiOCl p-n heterojunction, leading to a significant enhancement of photocurrent . The PEC sensing platform fabricated by bio-etching strategy presents acceptable detection specificity and high detection sensitivity with a low detection limit of 29 cfu/mL for SRB. The current work can provide new strategies to sensitize PEC platforms for detection of microorganisms that produce corrosive metabolite.
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Environmental Science-Nano
·
2018
·Vol. 6
·期 1
·207-215
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IF 6.087
Miao Peng,Guijian Guan,Hong Deng,Bin Han,Chen Tian,Junyang Zhuang,Yunyun Xu,Weizhen Liu,Zhang Lin
Considering p-arsanilic acid (p-ASA) as an organoarsenic pollutant, monitoring concentration of p-ASA is significant to maintain environmental security. Photoelectrochemical (PEC) detection is promisingly applied in environmental monitoring for its lower cost and simpler operation, compared to traditional techniques. However, general electrode materials of PEC sensors need to be modified with biological probes due to lack of specific binding sites to analytes, which may lead to complicated sensor fabrication and bio-recognizers inactivation during storage. Herein, a porphyrinic metal–organic framework/reduced graphene oxide (PCN-224/rGO) nanocomposite with simultaneously excellent photoelectric activity and strong binding characteristics was prepared and used to fabricate a PEC sensor for p-ASA detection avoiding the modification of bio-recognizers. Benefiting from the high conductivity of rGO, the separation efficiency of charge carriers was improved in PCN-224/rGO and thereby photocurrent gained an amplification of about 12 times. The PCN-224/rGO nanocomposite had strong affinity to p-ASA via Zr–O–As coordination and π–π stacking. Significantly, the binding of p-ASA could adjust the band position of PCN-224/rGO and facilitate oxygen reduction by releasing more photogenerated electrons, achieving photocurrent enhancement. The developed PEC sensor had a wide detection range, from 10 ng L−1 to 10 mg L−1, with a detection limit of 5.47 ng L−1. Furthermore, the sensor was successfully applied to monitor p-ASA in simulated natural water and swine manure lixivium. This study paved the way for the design of more efficient PEC sensors for environmental monitoring.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2018
·Vol. 303
·期 7
·1800104
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IF 2.69
Wen Jiang Zheng,Yang Gao,Xiao Xi Fan,Xiao Feng Cui,Wei Zou,Dan Zheng,Jie Yan,Bin Li
The application of traditional chemically crosslinked hydrogels is often limited by poor mechanical properties because of their own inhomogeneous network and irreversible crosslinking bonds. Herein, physical interactions are applied to crosslink the interpenetrating network hydrogel, i.e., hydrogen bonding and crystalline domain for polyvinyl alcohol network, and hydrophobic interaction inside micelle for poly (acrylamide- co -stearyl methyl acrylate) [P(AAm- co -SMA)] network. In this gel network system, reversible energy dissipation mechanism is realized by dissociation and reassociation of weak interactions including hydrogen bonding and hydrophobic interaction inside the micelle. Strong crystalline domains serve as permanent crosslinking interactions to maintain network integrity under large extension. As a result, the synergy of weak and strong interactions leads to tough, antifatigue, fast recovery, and self-healing properties of the hydrogel. This proposed strategy of achieving versatile hydrogels can broaden the use of hydrogels into load-bearing applications.
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Materials
·
2018
·Vol. 11
·期 8
·1316
·
IF 2.467
Shuai Wang,Jia Wang,Ping Li,Zexing Wu,Xien Liu
Efficient electrocatalyst plays a significant role on the development of hydrogen energy. In this work, an N,P-codoped carbon layer coupled with MoP nanoparticles (MoP/NPCs) was prepared through a facile high-temperature pyrolysis treatment. The obtained MoP/NPCs presented efficient activity for hydrogen evolution reaction (HER), with low onset potential of 90 mV, and a small Tafel slope (71 mV dec−1), as well as extraordinary stability in acidic electrolyte. This work provides a new facile strategy for the design and synthesis of sustainable and effective molybdenum-based electrocatalysts as alternatives to non-Pt catalysts for HER.Keywords:electrocatalysts;hydrogen evolution reaction;carbon layer;molybdenum phosphide
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Li-fang Gao,Xin Lin,Xin Hai,Xu-wei Chen,Jian-hua Wang
A highly sensitive and selective detection of p-phenylenediamine (PPD) is achieved by a fluorescence sensor, which is constructed by encapsulating the hydrophobic fluorescent 1-pyrenecarboxaldehyde (Py-CHO) into a polymeric ionic liquid (PIL)-based amphiphilic block copolymer (BCP) micelle. The amine–aldehyde condensation reaction between PPD and Py-CHO leads to the fluorescence quenching of Py-CHO, giving rise to the basis for the quantitative detection of PPD. The core cavity of the micelle formed by the self-assembly of PIL provides an excellent hydrophobic environment for the accommodation of fluorescent Py-CHO, offering significant improved sensitivity and selectivity for PPD detection. The amount of PIL in fabricating the amphiphilic BCP micelle, the BCP-Py-CHO micelle concentration, and the detection pH condition are investigated to obtain the best performance of this sensor. The accurate detection of PPD is achieved in the range of 0.02–10 μmol L–1 under optimal conditions, and the detection limit is 0.007 μmol L–1 (3σ/s). The developed sensor is successfully applied to the determination of PPD contents in hair dyes, spiked water, and urine samples.
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