Abstract
Acidification of paper-based relics is a common problem,leading to their degradation and eventual loss.Paper deacidification is highly dependent on a limited variety of alkaline materials,and the develop-ment of new materials that are safe,efficient and easy-to-prepare is highly demanded to ensure a high level of safety and effective protection of paper-based relic.This study proposes the introduction of lay-ered double hydroxide(LDH)and its calcined product,mixed metal oxide(layered double oxide(LDO)),as innovative protective materials for the deacidification of paper with varying levels of acidity.The re-sults demonstrate that treatment with Mg-Al LDH/LDO can effectively modify the pH of acidic paper(e.g.,pH～4.0-6.4)to a neutral or weakly basic state,maintaining this desirable pH range even under long-term accelerated aging condition.Remarkably,LDH proves to be well-suited for the protection of slightly acidified paper(e.g.,pH＞5.5),while LDO serves as an especially option for the deacidification of severely acidified paper(e.g.,pH ≤ 5.5).During aqueous deacidification,due to the memory effect of the LDH-based materials,LDO is converted to rehydrated LDH,which creates a mild and appropriate al-kaline retention in the paper,avoiding damage caused by strong alkalinity such as cellulose degradation and pigment fading during subsequent long-term natural preservation of the paper.Furthermore,Mg-Al LDH/LDO materials also exhibit flame-retardant and bacteriostatic properties.This opens up opportunities for the safe,efficient and multifunctional protection of acidified paper-based relics.
维普
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