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Zhang Z.,CAS Lanzhou Institute of Chemical Physics | Zhang Z.,University of the Chinese Academy of SciencesBeijing | Wang W.,CAS Lanzhou Institute of Chemical Physics | Kang Y.,CAS Lanzhou Institute of Chemical Physics | And 2 more authors.
RSC Advances | Year: 2015

As the materials of "green 21st century material worlds", natural silicates have received unprecedented attention by virtue of their abundance, low-cost, stability, and non-toxic and eco-friendly nature compared to other synthetic materials. With the aim to develop a new hybrid silicate adsorbent with improved adsorption properties, the naturally abundant palygorskite (PAL) was functionalized with glycine (GLY) via a simple one-step hydrothermal process and used for capturing Pb(ii) ions from aqueous solution. The main reaction parameters, e.g., the pH values of the reaction medium, solid-to-liquid ratio, reaction time and dosage of GLY, were systematically optimized, and the as-prepared adsorbent was characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmittance electronic microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) techniques. The results reveal that the PAL crystal was converted to a hybrid silicate material with the assistance of GLY, and simultaneously the functional groups were introduced during the hydrothermal reaction, which caused an evident enhancement in the adsorption capacity of PAL for Pb(ii) ions from 55.76 mg g-1 to 123.24 mg g-1. Almost 99.60% of Pb(ii) could be captured and removed from a 40 mg L-1 Pb(ii) solution using the as-prepared GLY-PAL silicate adsorbent, which is obviously higher than the 83.85% achieved by raw PAL. The intensified complexation of the functional groups on the silicate with Pb(ii), the electrostatic attraction and the pore adsorption are responsible for the enhancement in the adsorption capability. © The Royal Society of Chemistry. Source


Cao X.-L.,CAS Fujian Institute of Research on the Structure of Matter | Cao X.-L.,University of the Chinese Academy of SciencesBeijing | Kong F.,CAS Fujian Institute of Research on the Structure of Matter | Hu C.-L.,CAS Fujian Institute of Research on the Structure of Matter | Mao J.-G.,CAS Fujian Institute of Research on the Structure of Matter
Inorganic Chemistry Frontiers | Year: 2014

Using Hg2Cl2, MoO3, and TeO2 (or SeO2) as starting materials, four new mixed-metal tellurites and selenites have been obtained in the unexplored mercury(i)-Mo6+-Se4+/Te4+-O system, namely, Hg2MoSeO6 (1), α-Hg2MoTeO6 (2), β-Hg2MoTeO6 (3), and Hg2Mo2TeO9 (4). They represent the first mercury(i) tellurites and selenites containing octahedrally coordinated d0 transition metal (TM) cations. All four compounds are centrosymmetric. They show three types of 3D structures based on Hg22+ dumbbells, MoO6 octahedra, QO32- (Q = Se, Te) or TeO44- anions. Compounds 1-3 feature similar 1D anionic chains of [MoO3(QO3)]2- (Q = Se or Te), in which the 1D chains of corner-sharing MoO6 octahedra are further decorated by bidentate bridging selenite or tellurite anions. Compounds 1 and 2 are isostructural and their 3D network structures are based on 2D mercury tellurite or selenite layers in the ac plane pillared by MoO6 octahedra, whereas the 3D network of β-Hg2MoTeO6 (3) is composed of 1D mercury tellurite chains along the a axis and 1D chains of [MoO3(TeO3)]2- anions along the b axis. Compound 4 features an unusual 3D network structure composed of novel [Mo2O5(TeO4)]2- double layers interconnected by Hg22+ cations. Within the [Mo2O5(TeO4)]2- double layer, the cyclo-Mo4O20 tetramers are further interconnected via corner sharing into a 2D molybdenum oxide double layer with TeO4 groups capping the walls of the thus-formed eight-membered rings (8-MRs). Thermal stabilities and optical properties as well as theoretical calculations based on density functional theory (DFT) methods were also performed. This journal is © the Partner Organisations. Source


Sun H.,CAS Changchun Institute of Applied Chemistry | Sun H.,University of the Chinese Academy of SciencesBeijing | Gao N.,CAS Changchun Institute of Applied Chemistry | Ren J.,CAS Changchun Institute of Applied Chemistry | Qu X.,CAS Changchun Institute of Applied Chemistry
Chemistry of Materials | Year: 2015

An effective and economic rewritable paper (RPs) based on the reversible discoloration reactions of polyoxometalates (POMs) was designed. Polyethylene glycol was utilized not only to passivate efficiently the hydroxyl groups of paper but also possess excellent swellability and assisted the penetration of H2O2 molecules. Consequently, this increased the opportunity of triggering the redox reaction of POMs, which made the characters and patterns clearer on RP. For control, the PRPs without PEG20000 were also prepared. After characters were written, the H2O2 ink diffused rapidly on the surface of paper without PEG20000, resulting in the unclear written records; whereas for the PEG20000 passivated RP, the written characters were clear and neat, which demonstrated the necessity of PEG in construction of PRPs. Because a household UV disinfector can be used as the UV light source and H2O2 and isopropyl alcohol are domestic disinfectant, detergents and flavoring agent, the designed PRPs show promising potential for use as a long lasting rewritable paper. Source


Li L.,CAS Fujian Institute of Research on the Structure of Matter | Zhang S.,CAS Fujian Institute of Research on the Structure of Matter | Xu Y.,CAS Fujian Institute of Research on the Structure of Matter | Xu Y.,University of the Chinese Academy of SciencesBeijing | And 3 more authors.
Inorganic Chemistry | Year: 2015

A new entangled metal-organic framework shows reversible structural dynamics and luminescence changing in response to the loss of guest H2O molecules. Furthermore, an intense and sensitive luminescence turn-on sensing was observed by the naked eye for 1 upon detection of the volatile organic solvent molecule CH3CN, accompanied by reversible structural transformation. © 2015 American Chemical Society. Source


Zhang T.,CAS Lanzhou Institute of Chemical Physics | Zhang T.,University of the Chinese Academy of SciencesBeijing | Cui S.,CAS Lanzhou Institute of Chemical Physics | Cui S.,University of the Chinese Academy of SciencesBeijing | And 3 more authors.
Chemical Communications | Year: 2015

A simple method to improve the photoelectrochemical performance of TiO2 nanotube arrays (NTs) by simple air plasma post-treatment is reported. The air plasma treated sample shows higher photocurrent density and incident photo current efficiency with high stability, about 3-4 times that of the pristine TiO2 NTs even after six months. © The Royal Society of Chemistry. Source

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