In Situ Depositing Ag NPs on PDA/SiW₁₁V Co‐encapsulated Fe₃O₄@TiO₂ Magnetic Microspheres as Highly Efficient and Durable Visible‐light‐driven Photocatalysts

Abstract

The design and preparation of highly efficient and durable visible‐light‐driven photocatalysts remain a great challenge in the environment remediation. In this paper, a new multi‐component composite, Fe3O4@TiO2@PDA/SiW11V−Ag, is successfully fabricated by in situ assembling Ag nanoparticles (NPs) onto polydopamine (PDA) and mono‐vanadium substituted silicotungstate (SiW11VO406−, simplified as SiW11V) co‐encapsulated Fe3O4@TiO2 magnetic microspheres. In the photodegradation of methyl orange (MO) and photocatalytic reduction of Cr(VI) under visible light, the multi‐component composite displays the enhanced catalytic efficiency in comparison with other catalysts with less‐components. Structure‐reactivity relationship is established based on the correlation between photocatalytic efficiency and transient photocurrent intensity. Notably, the multi‐component composite exhibits high stability and durability in wide range of pH aqueous solutions and most of organic solvents. The successful preparation of this novel type of materials provides a promising approach for constructing stable photocatalysts with multi‐components, where poor compatibility of each component can be well bridged via PDA as an efficient linker and charge transport.

Flexible Wearable Electronic Fabrics with Dual Functions of Efficient EMI Shielding and Electric Heating for Triboelectric Nanogenerators

“…The existence of plenty of Ag-NPs is owing to the inclusion of an internal PDA layer with a large number of functional groups such as quinone, carboxyl, amino, imino, and catechol on the PDA surface, which maximize the adsorption of Ag + . Through the reduction reaction, the adsorbed Ag + can be converted into Ag-NPs. − As shown in Figure d1, the composite layer created some fine cracks but no big pieces of peeling and fracture. In Figure d2, when the E-Fabric is dragged by external forces, the PDA@CNT in the inner and outer layers can generate a counteracting effect against the external pressures, thereby enhancing the protection to E-Fabrics.…”

Application of polyoxometalates in photocatalytic degradation of organic pollutants

“…Recently, P. Wu et al designed and prepared a novel multicomponent photocatalyst Fe 3 O 4 @TiO 2 @PDA/SiW 11 V-Ag, which degraded MO completely under simulated solar light radiation in 120 min. [76] In this catalyst, TiO 2 is an active species to protect the Please do not adjust margins Please do not adjust margins composites, and provides a new way for achieving the high efficient and durable photocatalyst for practical wastewater treatment.…”

“…Recently, P. Wu et al designed and prepared a novel multi-component photocatalyst Fe 3 O 4 @TiO 2 @PDA/SiW 11 V–Ag, which degraded MO completely under simulated solar light irradiation in 120 min. 76 In this catalyst, TiO 2 is an active species to protect the Fe 3 O 4 from corrosion and oxidation; the [SiW 11 VO 40 ] 6− is another active component and electron reservoir that can enhance the electron–hole separation of TiO 2 ; the PDA acts as a conductive linker, which improves the electron transfer between components, and it also enhances the light absorption capacity of the composite in ultraviolet and visible region; Ag nanoparticles play a key role in enhancing the activity by providing electron trapping ability. The trapped electrons in Ag nanoparticles can further reduce O 2 to generate O 2 − active species which can directly oxidize MO to degraded products.…”

Near-infrared photothermal conversion of polyoxometalate-modified gold nanorods for plasmon-enhanced catalysis

“…Thus, a general approach integrating the catalytic property and the advantage of NIR conversion for enhanced catalytic reactions is highly desired. 24 Bearing this motivation in mind, the suitable combination of POMs with AuNPs by electrostatic interaction or covalent modification, such as those reported in the literature, [25][26][27][28][29] would be a robust candidate in this regard. On the other hand, the suitable combination of AuNPs with POMs could integrate the plasmaenhanced effect for synergistic catalysis.…”