A Transparent, High-Strength, and Recyclable Core–Shell Structured Wood Hydrogel Integrated with Carbon Dots for Photodegradation of Rhodamine B,ACS Applied Nano Materials

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A Transparent, High-Strength, and Recyclable Core–Shell Structured Wood Hydrogel Integrated with Carbon Dots for Photodegradation of Rhodamine B
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-02-09 , DOI: 10.1021/acsanm.2c05271
Junyao Li ₁ , Yu Wang ₁ , Yiying Yue ₁

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The opacity, fragility, and environmental unfriendliness of the traditional photocatalytic matrix cannot fully utilize the properties of photocatalysts and efficiently degrade pollutants. In this work, a transparent wood hydrogel with a core–shell structure was developed using transparent wood (TW) impregnated with polyacrylic acid (PAA) as the core layer and Bi-N-carbon dots/BiOBr (Bi-N-CDs/BiOBr) photocatalyst-initiated polymerization of acrylic acid (AA) monomers as the shell layer. In the shell layer, nanoscale CDs with rich hydrophilic groups built a link between BiOBr and PAA and strengthened the adsorption–photocatalysis synergistic removal for RhB. The original wood backbone well conserved during preparation led to an anisotropic structure in the resultant Bi-N-CDs/BiOBr@TW photocatalytic wood hydrogel. Namely, after introducing Bi-N-CDs/BiOBr as the linker and reinforcing agent, the tensile strength was up to 3.2 and 11.03 MPa along the radial (R-) and axial (A-) directions, which was 1.6- and 1.06-fold of R-TW and A-TW, respectively. Hence, Bi-N-CDs/BiOBr@TW with high strength furnishes multiple separations and reutilizations, and the RhB removal rate is approximately 85% after five cycles. The Bi-N-CDs/BiOBr@TW exhibited light transmittance up to 64.6 and 52.3% at 800 nm along the R- and A-directions, respectively. Moreover, the adsorption–photocatalysis synergistic rate of Bi-N-CDs/BiOBr@TW reached 93% in 300 min at pH = 7. This paper offers a strategy for fabricating wood hydrogels with outstanding stretchability, transparency, dye removal efficiency, and recyclability, opening a significant route for alleviating dye pollution.

中文翻译：

一种透明、高强度、可回收的核壳结构木水凝胶，结合碳点用于光降解罗丹明 B

传统光催化基质不透明、易碎、对环境不友好，无法充分利用光催化剂的特性，高效降解污染物。在这项工作中，以浸渍聚丙烯酸（PAA）的透明木材（TW）为核心层和Bi-N-碳点/ BiOBr（Bi-N-CDs / BiOBr）开发了具有核壳结构的透明木材水凝胶) 光催化剂引发的丙烯酸 (AA) 单体聚合作为壳层。在壳层中，具有丰富亲水基团的纳米级 CDs 在 BiOBr 和 PAA 之间建立了联系，加强了对 RhB 的吸附-光催化协同去除。原始木材骨架在制备过程中得到很好的保存，导致所得 Bi-N-CDs/BiOBr@TW 光催化木材水凝胶具有各向异性结构。即，引入Bi-N-CDs/BiOBr作为连接剂和增强剂后，沿径向（R-）和轴向（A-）方向的拉伸强度分别达到3.2和11.03 MPa，分别是传统材料的1.6和1.06倍。分别为 R-TW 和 A-TW。因此，高强度的Bi-N-CDs/BiOBr@TW提供了多次分离和再利用，五次循环后RhB的去除率约为85%。Bi-N-CDs/BiOBr@TW 在 800 nm 处沿 R 和 A 方向的透光率分别高达 64.6% 和 52.3%。此外，在 pH = 7 时，Bi-N-CDs/BiOBr@TW 的吸附-光催化协同率在 300 分钟内达到 93%。本文提供了一种制备具有出色拉伸性、透明度、染料去除效率和可回收性的木材水凝胶的策略，为减轻染料污染开辟了一条重要途径。

更新日期：2023-02-09

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