Jianting Tang

Novel visible light responsive Ag@(Ag2S/Ag3PO4) photocatalysts: synergistic effect between Ag and Ag2S for their enhanced photocatalytic activity

Novel composite photocatalysts, Ag@(Ag2S/Ag3PO4), have been synthesized by controlled calcination and exhibited much higher activity than that of Ag3PO4, Ag2S/Ag3PO4, Ag/Ag3PO4 and AgX/Ag3PO4 (X = Cl, Br and I) in degradation of rhodamine B. The excellent activity is ascribed to the synergistic effect between Ag and Ag2S.

A novel AgIO4 semiconductor with ultrahigh activity in photodegradation of organic dyes: insights into the photosensitization mechanism

A novel AgIO4 semiconductor has been prepared via a facile precipitation method. It exhibited much higher activity than Ag3PO4 or Ag3AsO4 in photodegradation of rhodamine B under visible-light irradiation. The ultrahigh activity of AgIO4 is attributed to the photosensitization mechanism of the photodegradation process.

Preparation of N-Doped Mesoporous TiO2 Using Nitromethane as Nitrogen Source and Their High Photocatalytic Performance

N-doped mesoporous TiO2 was successfully prepared by using CH3NO2 as the nitrogen source and P123 as template. The materials were characterized by TEM, N2 sorption, XRD, XPS, UV-vis DRS, and TG-DTA techniques. The photocatalytic activity of N-doped TiO2 was tested in elimination of gaseous methanol, formaldehyde, and BTX (benzene, toluene and xylene). The obtained N-doped mesoporous TiO2 materials have better photocatalytic activity than commercial photocatalyst (Degussa P25). Moreover, the N-doped mesoporous TiO2 photocatalysts are easy to prepare and have stable performance, high photocatalytic activity and long lifetime.

La-modified mesoporous TiO2 nanoparticles with enhanced photocatalytic activity for elimination of VOCs

La-modified mesoporous TiO2 were synthesized via a sol–gel route using Pluronic P123 as template. The XRD and TEM results show that La loading favors the formation of anatase with smaller crystal size. The photocatalytic activity of the mesoporous anatase was tested in photocatalytic elimination of VOCs. The photocatalysts exhibited higher activity than that of the commercial photocatalyst (Degussa, P25) under either ultraviolet or visible light irradiation. The superior activity of the mesoporous anatase may be attributed to the synergic effects of the surface area, crystal size and loaded La species.

Two multifunctional organic-inorganic hybrid complexes based on polyoxometalates, BiEDTA and sodium linker: crystal structures, photochromic, and catalytic performances

Abstract Two 3-D organic–inorganic hybrid supermolecular complexes, Na(BiHEDTA·2H2O)3(PW12O40)·2H3O (BiPW) and Na(BiHEDTA·2H2O)3(PMo12O40)·2H3O·2H2O (BiPMo) ethylenediamine tetraacetic acid (EDTA) have been synthesized by solution method and characterized by ultraviolet visible (UV–vis) spectroscopy, thermogravimetric-differential thermal analysis, photoluminescence, cyclic voltammetry, and single-crystal X-ray diffraction (XRD). XRD analysis reveals that BiPW and BiPMo are isostructural with 3-D architectures assembled by 2-D layer tetranuclear cation and a Keggin-type polyoxoanion. Although these two hybrids exhibit similar structures, the properties depend on the nature of polyoxoanion [PM12O40]3− (M = W, Mo). Under UV irradiation, BiPW and BiPMo show fast response of reversible and irreversible photochromism, respectively. BiPW exhibits excellent photocatalytic activity in degradation of methyl orange dyes under irradiation of UV–visible light. It can be reused for at least six cycles without obvious loss of activity in the degradation experiments; BiPMo shows catalytic activity in elimination of methanol. The elimination rate of methanol reaches 56.9% when the concentration of methanol is 2.3 g·m−3 and the flow velocity is 10 mL·min−1 at 100 °C.

Crystal Structure and Blue Fluorescence of a New Inorganic-Organic Hybrid Polyoxometalate (3-C6H8N)4(PMo12O40)·H2O

One new supramolecular structure organic-inorganic hybrid compound (3-C6H8N)4(PMo12O40)·H2O constructed by phosphomolybdate and 3-methylpyridine via hydrogen bond and π-π stacking interactions was obtained by hydrothermal reaction and characterized by IR, UV-vis, TG-DTA, FL, CV, and single-crystal X-ray diffraction. The luminescent properties of the compound at room temperature were investigated. The title compound exhibits good thermal stability and blue fluorescence in the aqueous solution at room temperature. The CV curve revealed a pair of irreversible redox wave and two pairs of redox wave, which are one-electron and two-electron quasireversible redox processes of Mo. Supplemental materials are available for this article. Go to the publishers online edition of Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry to view the supplemental file.

Synthesis, crystal structure, and catalytic performance of two 3-D supramolecular compounds: (C7N2H7)3(C7N2H6) · PMo12O40 · 2H2O and (C7N2H7)3(C7N2H6)2 · AsMo12O40 · 3H2O

Two organic–inorganic compounds based on Keggin building blocks have been synthesized by hydrothermal methods, (C7N2H7)3(C7N2H6) · PMo12O40 · 2H2O (1) and (C7N2H7)3(C7N2H6)2 · AsMo12O40 · 3H2O (2) (C7N2H6 = benzimidazole). Single-crystal X-ray analysis revealed that 1 crystallized in the triclinic system, P-1 space group with a = 9.8980(4) Å, b = 11.2893(4) Å, c = 25.8933(9) Å, α = 93.307(2)°, β = 90.630(2)°, γ = 108.330(2)°, V = 2740.68(18) Å3, Z = 2, R 1(F) = 0.0740, ωR 2(F 2) = 0.1511, and S = 1.037; 2 crystallized in the triclinic system, P-1 space group with a = 12.3353(4) Å, b = 13.2649(4) Å, c = 20.2878(6) Å, α = 95.6630(10)°, β = 100.1720(10)°, γ = 99.3940(10)°, V = 3195.72(17) Å3, Z = 2, R 1(F) = 0.0329, ωR2 (F 2) = 0.1236, and S = 1.088. The two compounds show a layer framework constructed from Keggin-polyoxoanion clusters and benzimidazole via hydrogen bonds and π–π stacking interactions, resulting in a 3-D supramolecular network. Both have high catalytic activity for oxidation of methanol. When the initial concentration of the methanol is 5.37 g m−3 in air and the flow velocity is 4.51 mL min−1, methanol is completely eliminated at 150°C for 1 (160°C for 2).

Controllable Preparation of La/TiO2 Using Hyperbranched Polyglycerols as Template and Their Photocatalytic Performance

Three hyperbranched polyglycerols with different molecular weight were synthesized by controlling the molar ratio of monomer and initiator. La-doped TiO2 catalysts were synthesized by those HPG as a templating agent for size control of La/TiO2. The photocatalytic elimination of methanol was used as model reactions to evaluate the photocatalytic activity of the catalysts. The size of La/TiO2 particles could be adjusted by changing the molecular weight of the HPG. With the molecular weight of HPG increase, the size of La/TiO2 particles decrease, the photocatalytic activity of the as-prepared catalysts enhance. This catalytic reaction follows the Langmuir-Hinshellwood mechanism.