抗菌掺锌地质聚合物的结构组成,Dalton Transactions

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抗菌掺锌地质聚合物的结构组成
Dalton Transactions ( IF 3.5 ) Pub Date : 2023-05-17 , DOI: 10.1039/d3dt01235b
Xiaojuan Kang ₁ , Hailong Ye ₁

Affiliation

阐明地质聚合物中三维无定形钠铝硅酸盐水合物 (Na ₂ O–Al ₂ O ₃ –SiO ₂ –H ₂ O, N–A–S–H) 凝胶的结构组成是其普遍应用的先决条件在生物材料、建筑、废物管理和减缓气候变化方面。地质聚合物科学中一个未解决的挑战是对掺杂有所需金属的无定形 N-A-S-H 的清晰结构理解。在这里，我们揭示了 (Zn)-N-A-S-H 的分子结构，证实了 Zn 与 O 的四面体配位以及 Si-O-Zn 键的存在。_{~3.0–3.1 Å 的 Zn–Si 距离证明了 ZnO 4}²⁻四面体和 SiO ₄角的连接轻微扭曲形成四面体。ZnO 掺杂地质聚合物的化学计量式量化为 (Na _0.19 Zn _0.02 AlSi _1.74 O _5.095 )·0.19H ₂ O。Zn 改性地质聚合物在抑制硫氧化细菌形成生物膜方面具有显着的抗菌功效证明了Acidithiobacillus thiooxidans和抑制生物酸化。_{以网络的 Si-O-Al 和 Si-O-Zn 键断裂为特征的地质聚合物的生物降解过程导致四面体 AlO 4}^-和 ZnO ₄^2-的排出来自铝硅酸盐骨架和硅质结构的最终形成。这项工作表明，我们的新型地质聚合物的 (Zn)-N–A–S–H 结构为优化地质聚合物材料提供了解决方案，并为设计用于建筑材料、牙科或骨外科抗菌生物材料的新型地质聚合物复合材料提供了进一步的可能性以及危险废物和放射性废物的管理。

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Structural composition of antibacterial zinc-doped geopolymers

Elucidating the structural composition of a three-dimensional amorphous sodium-aluminosilicate-hydrate (Na₂O–Al₂O₃–SiO₂–H₂O, N–A–S–H) gel in geopolymers is a prerequisite for its prevailing application in biomaterials, construction, waste management, and climate change mitigation. An unsolved challenge in geopolymer science is the clear structural understanding of amorphous N–A–S–H doped with desired metals. Here, we uncover the molecular structure of (Zn)-N–A–S–H, confirming the tetrahedral coordination of Zn with O and the presence of Si–O–Zn bonds. The Zn–Si distance of ∼3.0–3.1 Å proves the connection of the corners of ZnO₄²⁻ tetrahedra and SiO₄ tetrahedra by slight twisting. The stoichiometric formula of the ZnO-doped geopolymer is quantified as (Na_0.19Zn_0.02AlSi_1.74O_5.095)·0.19H₂O. The remarkable antimicrobial efficacy of the Zn modified-geopolymer in inhibiting the formation of biofilms by the sulphur-oxidising bacteria Acidithiobacillus thiooxidans and inhibiting biogenic acidification is evidenced. The biodegradation process of the geopolymer featuring the rupture of the Si–O–Al and Si–O–Zn bonds of the networks leads to the expelling of tetrahedral AlO₄⁻ and ZnO₄²⁻ from the aluminosilicate framework and the eventual formation of the siliceous structure. This work demonstrates that the (Zn)-N–A–S–H structure of our new geopolymer provides a solution to optimising geopolymer materials and provides further possibilities for designing novel geopolymer composites for use in construction materials, antibacterial biomaterials in dental or bone surgery, and management of hazardous and radioactive waste.

更新日期：2023-05-17

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