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A "concentration-induced self-assembly" strategy for Ag _x H_3-x PMo₁₂O₄₀ nanorods: synthesis, photoelectric properties and photocatalytic applications.

ABSTRACT: Polyoxometalates (POMs) as molecule-based metal oxides have exhibited significant application in catalysis and materials science, but the synthesis of pristine POM nanomaterials still remains a challenge. In this work, we find a novel strategy of concentration-induced self-assembly for gaining pristine POM nanorods Ag _x H_3-x PMo₁₂O₄₀ (denoted as AgHPMo₁₂), which are synthesized only from both POMs and silver ion Ag⁺ in an aqueous solution at room temperature. The controllable concentrations of the cationic and anionic components in the aqueous solution become the critical factor for the successful synthesis. In addition, the photoelectric properties of AgHPMo₁₂ nanorods were investigated as compared to those of AgHPMo₁₂ particles, indicating a superior photoelectric performance of AgHPMo₁₂ nanorods to AgHPMo₁₂ particles. Furthermore, AgHPMo₁₂ nanorods/phthalocyanine heterojunction photocatalysts were prepared for evaluating photocatalytic degradation of tetracycline hydrochloride, showing an efficient photocatalytic performance due to the advantages of the nanorods and type II heterostructure.

SUBMITTER: Wang X

PROVIDER: S-EPMC9419120 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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A "concentration-induced self-assembly" strategy for Ag x H3-x PMo12O40 nanorods: synthesis, photoelectric properties and photocatalytic applications.

Wang Xinxin X Song Yuting Y Li Fengyan F Xu Wenjuan W Zheng Yue Y Xu Lin L

Nanoscale advances 20201126 2

Polyoxometalates (POMs) as molecule-based metal oxides have exhibited significant application in catalysis and materials science, but the synthesis of pristine POM nanomaterials still remains a challenge. In this work, we find a novel strategy of concentration-induced self-assembly for gaining pristine POM nanorods Ag x H3-x PMo12O40 (denoted as AgHPMo12), which are synthesized only from both POMs and silver ion Ag+ ...[more]

PMID: 36131754

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Project description:Photocatalyst is the core of photocatalysis and directly determines photocatalytic performance. However, low quantum efficiency and low utilization of solar energy are important technical problems in the application of photocatalysis. In this work, a series of polyoxometalates (POMs) [H3PW12O40] (PW12)-doped titanium dioxide (TiO2) nanofibers modified with various amount of silver (Ag) nanoparticles (NPs) were prepared by utilizing electrospinning/photoreduction strategy, and were labelled as x wt% Ag/PW12/TiO2 (abbr. x% Ag/PT, x = 5, 10, and 15, respectively). The as-prepared materials were characterized with a series of techniques and exhibited remarkable catalytic activities for visible-light degradation tetracycline (TC), enrofloxacin (ENR), and methyl orange (MO). Particularly, the 10% Ag/PT catalyst with a specific surface area of 155.09 m2/g and an average aperture of 4.61 nm possessed the optimal photodegradation performance, with efficiencies reaching 78.19% for TC, 93.65% for ENR, and 99.29% for MO, which were significantly higher than those of PW12-free Ag/TiO2 and PT nanofibers. Additionally, various parameters (the pH of the solution, catalyst usage, and TC concentration) influencing the degradation process were investigated in detail. The optimal conditions are as follows: catalyst usage: 20 mg; TC: 20 mL of 20 ppm; pH = 7. Furthermore, the photodegradation intermediates and pathways were demonstrated by HPLC-MS measurement. We also investigated the toxicity of products generated during TC removal by employing quantitative structure-activity relationship (QSAR) prediction through a toxicity estimation software tool (T.E.S.T. Version 5.1.2.). The mechanism study showed that the doping of PW12 and the modification of Ag NPs on TiO2 broadened the visible-light absorption, accelerating the effective separation of photogenerated carriers, therefore resulting in an enhanced photocatalytic performance. The research provided some new thoughts for exploiting efficient and durable photocatalysts for environmental remediation.

Dataset Information

A "concentration-induced self-assembly" strategy for Ag _x H_3-x PMo₁₂O₄₀ nanorods: synthesis, photoelectric properties and photocatalytic applications.

Publications

A "concentration-induced self-assembly" strategy for Ag <sub><i>x</i></sub> H<sub>3-<i>x</i></sub> PMo<sub>12</sub>O<sub>40</sub> nanorods: synthesis, photoelectric properties and photocatalytic applications.

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