Institute of Chemistry
Changchun Institute of Applied Chemistry, Chinese Academy Of SciencesNot a member yet
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Converting real-world mixed waste plastics into porous carbon nanosheets with excellent performance in the adsorption of an organic dye from wastewater
No full textWaste plastic utilization and wastewater treatment are the two most serious challenges on the path to urbanization and industrialization, due to the limited fossil fuel resources, ever-increasing energy demands, and severe environmental pollution. The conversion of waste plastics into high value-added carbon nanomaterials has become a promising way to utilize waste plastics; however, most current studies are limited to single component waste plastic; besides, little attention has been paid to porous carbon nanosheets (PCNSs). Herein, a facile approach was established to prepare PCNSs by the carbonization of real-world mixed waste plastics on organically-modified montmorillonite and subsequent KOH activation. The morphology, microstructure, textural property, phase structure, surface element composition, and thermal stability of the PCNSs were investigated. The PCNSs showed high specific surface area (2315 m(2) g(-1)) and large pore volume (3.319 cm(3) g(-1)) with high purity (>99.6%). More importantly, the PCNSs exhibited fast adsorption (about 95% of methylene blue (MB) was removed during the first 10 min of adsorption), an unprecedented adsorption capacity of 769.2 mg g(-1) (higher than most of reported adsorbents), and excellent recyclability (after ten cycles, an adsorption capacity of 692.0 mg g(-1) remained and 90 wt% of the PCNS was reclaimed) for MB from wastewater. This was attributed to the high specific surface area and large pore volume of the PCNS, and due to multiple adsorption mechanisms, including pore filling, hydrogen bonding, and pi-pi and electrostatic interactions between MB and the PCNS. It is believed that this work not only provides a novel potential way to utilize waste plastics, but also presents a facile sustainable approach to synthesize PCNSs, which will be an ideal candidate for various applications
Ultrasonic synthesis of highly dispersed Au nanoparticles supported on Ti-based metal-organic frameworks for electrocatalytic oxidation of hydrazine
No full textIn this work, Au nanoparticles supported on amino-functionalized Ti-benzenedicarboxylate metal-organic frameworks (Au/NH2-MIL-125(Ti)) were prepared by a facile ultrasonic method. The complex was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption spectroscopy and electrochemical methods. The obtained nanocomposites exhibit excellent electrocatalytic activity toward hydrazine oxidation, which is attributed to their large specific surface area and good conductivity. In addition, we found that solution pH has an obvious effect on the electrocatalytic activity of Au/NH2-MIL-125(Ti) toward hydrazine oxidation. On this basis, we constructed a simple, sensitive, selective and inexpensive electrochemical method to detect hydrazine. A linear dynamic range of 10 nM to 100 mu M with a detection limit of 0.5 nM was obtained. It was demonstrated that the fabrication of Au NPs on amino-functionalized Ti-based MOFs could be promising for the sensing of hydrazine. Our results imply the potential application of metal nanoparticle/MOF nanocomposites in the field of electroanalytical chemistry
Selection strategy of porphyrins for achieving thermally stable polymer solar cells
No full textThermal stability is an important issue of polymer solar cells (PSCs), especially for the large scale PSCs in potential real application. A new strategy of introducing porphyrin compounds to prevent fullerene aggregation and stabilize device performance under thermal stress has previously been proposed by this group. However, the effect of the porphyrin chemical structure on thermal stability still remains unclear, and the decreased power conversion efficiency (PCE) resulting from porphyrin addition needs to be overcome. In the present work, different types of porphyrins, including beta-substituted and/or metallized ones, were selected, and their interactions with fullerene were first theoretically simulated, and then the morphology stability of porphyrin/fullerene binary blend films was quantitatively studied. In addition, the effect of porphyrin properties, such as self-aggregation and photo-thermal stability, was also investigated. It was eventually found that porphyrin BL3, which is -NO2-substituted and Cu-metallized, was the most promising candidate for improving the thermal stability while simultaneously keeping the device PCE higher than that of the ones without porphyrins. This porphyrin selection strategy, which has also demonstrated the feasibility for the P3HT:PC71BM system, is wished to be the stepping-stone in the study on the thermal stability of photovoltaic devices and push forward the PSC real application
MoP nanosheets supported on biomass-derived carbon flake: One-step facile preparation and application as a novel high-active electrocatalyst toward hydrogen evolution reaction
No full textSearching for Pt-free hydrogen evolution reaction (HER) electrocatalysts based on low-cost and eartha-bundant materials is a crucial task for hydrogen-based energy industry. In this work, we demonstrate the one-step facile preparation of MoP nanosheets supported on carbon flake via a solid-state reaction with the use of (NH4)(6)Mo7O24 center dot 4H(2)O, NaH2PO4 center dot 2H(2)O and a biomass, sodium alginate, as Mo, P and C sources, respectively. When used as a novel HER electrocatalyst, such composites are excellent in activity and durability in acidic electrolytes. Moreover, they are also active in neutral electrolytes. (C) 2014 Elsevier B.V. All rights reserved
Multifunctional Nd3+-sensitized upconversion nanomaterials for synchronous tumor diagnosis and treatment
No full textCore-shell structured Nd3+-sensitized NaYF4:Yb/Nd/Er@NaYF4:Nd@mSiO(2) nanoparticles (NPs) were designed and synthesized. The NaYF4:Yb/Nd/Er@NaYF4:Nd core imparts the nanomaterials with luminescence properties for upconversion optical imaging under 808 nm laser irradiation, whereas the mesoporous SiO2 shell allows the nanomaterials to be loaded with anticancer drug doxorubicin (DOX). In vivo toxicity assessment has confirmed that the NPs have low systematic toxicity in healthy mice. In vivo antitumor activity shows that the nanocomposites exhibit greater antitumor efficacy than pure DOX. As a result, the composite nanomaterials can serve as nanotheranostic materials for synchronous upconversion luminescence imaging under 808 nm laser irradiation, and as anticancer drug delivery vehicles, so as to integrate the diagnosis and treatment of cancers in vivo
Nitrogen and fluorine dual-doped mesoporous graphene: a high-performance metal-free ORR electrocatalyst with a super-low HO2- yield
No full textIn this study, we successfully, for the first time, prepared nitrogen and fluorine dual-doped mesoporous graphene (NF-MG) via the thermal treatment of graphene oxide/polyaniline composites (GO/PANI) and NH4F. Benefiting from the synergistic effect of N and F co-doping into the G framework, the oxygen reduction reaction performance of the optimal catalyst (NF-MG3) is comparable with the-state-of-the-art Pt/C catalyst in an alkaline medium, which makes it an ideal candidate as an efficient metal-free ORR electrocatalyst in fuel cells
G-quadruplex enhanced fluorescence of DNA-silver nanoclusters and their application in bioimaging
No full textGuanine proximity based fluorescence enhanced DNA-templated silver nanoclusters (AgNCs) have been reported and applied for bioanalysis. Herein, we studied the G-quadruplex enhanced fluorescence of DNA-AgNCs and gained several significant conclusions, which will be helpful for the design of future probes. Our results demonstrate that a G-quadruplex can also effectively stimulate the fluorescence potential of AgNCs. The major contribution of the G-quadruplex is to provide guanine bases, and its special structure has no measurable impact. The DNA-templated AgNCs were further analysed by native polyacrylamide gel electrophoresis and the guanine proximity enhancement mechanism could be visually verified by this method. Moreover, the fluorescence emission of C3A (CCCA) 4 stabilized AgNCs was found to be easily and effectively enhanced by G-quadruplexes, such as T30695, AS1411 and TBA, especially AS1411. Benefiting from the high brightness of AS1411 enhanced DNA-AgNCs and the specific binding affinity of AS1411 for nucleolin, the AS1411 enhanced AgNCs can stain cancer cells for bioimaging
Acidically oxidized carbon cloth: a novel metal-free oxygen evolution electrode with high catalytic activity
No full textThe efficiency of many energy storage technologies is limited by the sluggish kinetics of the oxygen evolution reaction (OER) and it is thus of great importance to develop highly active OER electrocatalysts made from earth-abundant elements. In this communication, we report a novel metal-free oxygen evolution electrode with high catalytic activity and stability through simple acidic oxidation of commercially available carbon cloth (CC). The resulting acidically oxidized CC exhibits an overpotential of 328 mV and a Tafel slope of 82 mV dec(-1) with 100% Faradaic efficiency. This electrode needs an overpotential of 477 mV to afford a current density of 10 mA cm(-2) and maintains its catalytic activity for at least 24000 s. It offers us a low-cost flexible electrocatalytic electrode for device integration toward water splitting and rechargeable metal-air battery applications
Label-free signal-on ATP aptasensor based on the remarkable quenching of tris(2,2 '-bipyridine)-ruthenium(II) electrochemiluminescence by single-walled carbon nanohorn
No full textThe quenching of electrochemiluminescence by single-walled carbon nanohorn has been demonstrated for the first time. Moreover, a sensitive, label-free, and signal-on electrochemiluminescence ATP aptasensor was developed using single-walled carbon nanohorn as both quencher and scaffold
Construction of a porous three dimensional rare earth metal-sulfur-ligand open framework
No full textA slow reaction between Nd3+ and piperazine-1,4-dicarbodithiolate disodium (Na-2(pipzdtc)) affords a three dimensional (3D) anionic [Nd(pipzdtc)(2)](n)(n-) framework with a dia net. The encapsulated disordered guest molecules could be partially exchanged by Ni2+ accompanied by the quenching of the typical NIR luminescence of Nd3+ ions