One-Step Synthesis of Starch-Based Composite Chrome-Free Tanning Agents via In Situ Catalysis Using Hydrotalcites
One-Step Synthesis of Starch-Based Composite Chrome-Free Tanning Agents via In Situ Catalysis Using Hydrotalcites
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DOI：
10.1021/acssuschemeng.3c03526
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发表时间：
2023-07
期刊：
影响因子：
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通讯作者：
Yiming Shen;Jianzhong Ma;Qianqian Fan;Han Yao;Jiaao Zhang;Wenbo Zhang;Hongxia Yan
中科院分区：
文献类型：
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作者：
Yiming Shen;Jianzhong Ma;Qianqian Fan;Han Yao;Jiaao Zhang;Wenbo Zhang;Hongxia Yan
将淀粉氧化成有价值的化学品在皮革工业中具有很大的前景，但现有反应的催化效率很低。此外，反应液体中的残留催化剂是潜在的环境危害。本文以淀粉为原料，采用过氧化氢氧化镁铝铁水滑石（MgAlFe-LDH）催化剂，引入功能基团和纳米材料，一步合成了淀粉基水滑石复合材料（OS-MgAlFe-LDH）。该催化剂显示出提高的催化效率，并且避免了污染的产生。结果表明，所制备的OS-MgAlFe-LDH适合作为无铬鞣的复合鞣剂，并能提高无铬鞣的效率，MgAlFe-LDH可作为交联增强剂。使用该鞣剂，坯革的水热稳定性提高（收缩温度：75 °C）。鞣制后的皮革具有高孔隙率（79.06%）和均匀的鞣剂分布，这归因于OS-MgAlFe-LDHs组分的不同分子量（重均分子量：5438 g/mol）。OS-MgAlFe-LDHs与皮革胶原蛋白的结合能较高（94.62 kcal/mol），抑制了OS-MgAlFe-LDHs从胶原蛋白中的迁移。因此，OS-MgAlFe-LDHs与皮革胶原具有较强的交联性能。本研究通过一步合成法制备了一种可持续发展的环境友好型鞣剂，为制革工业中生物质材料的制备提供了基础。
The oxidation of starch into valuable chemicals holds great promise for the leather industry, but the catalytic efficiency of existing reactions is low. Moreover, residual catalyst in the reaction liquid is a potential environmental hazard. Herein, starch was oxidized by hydrogen peroxide and a magnesium aluminum iron hydrotalcite (MgAlFe-LDH) catalyst to introduce functional groups and nanomaterials, forming a starch-based hydrotalcite composite (OS-MgAlFe-LDH) in one step. This catalyst showed improved catalytic efficiency, and the generation of pollution was avoided. Moreover, the prepared OS-MgAlFe-LDH was suitable as a complex tanning agent for chrome-free tanning with improved efficiency, and MgAlFe-LDH acted as a crosslinking reinforcing agent. Using this tanning agent, the hydrothermal stability of crust leather was enhanced (shrinkage temperature: 75 °C). The tanned leather had high porosity (79.06%) and a uniform tanning agent distribution ascribed to the varying molecular weights of the components of the OS-MgAlFe-LDHs (weight-average molecular weight: 5438 g/mol). The binding energy between OS-MgAlFe-LDHs and the leather collagen (94.62 kcal/mol) was high, inhibiting the migration of OS-MgAlFe-LDHs from the collagen matrix. Thus, OS-MgAlFe-LDHs exhibited strong crosslinking performance with leather collagen. In summary, a sustainable and environmental-friendly tanning agent was prepared by a one-step synthesis in this work, offering a fundamental step for the preparation of biomass materials in the leather industry.