摘要
采用PbO2/石墨复合材料为阳极、导电凝胶为阴极,通过对夹层于两电极间的模拟返铅纸质文物进行电化学作用,实现了对纸质文物返铅病害治理。实验结果表明,在电解过程中,PbO2阳极产生的羟基自由基将模拟样中硫化铅(PbS)氧化成白色硫酸铅。此电化学过程产生的羟基自由基被苯二甲酸原位氧化产生荧光所证明。光电子能谱(XPS)揭示了返铅主要成分硫化铅被氧化成硫酸铅(PbSO4)。与传统过氧化氢治理文物返铅病害相比,该方法具有显著的区域可控性。
Lead white darkening is a common disease of paper-based relics, which makes the cultural heritages lost their original appearance. In this paper, the method, the lead dioxide （Pbo2） composite as anode and the conductive hydrogel as cathode used to restore lead white darkening PbS into the original lead white, was investigated. The results indicated that PbS could be transformed into PbSO4. Additionally, a possible mechanism on this process was proposed, and proved by using fluorescence spectroscopy and X-ray photoelectron spectroscopy （XPS）. During the electrolysis, PbS is oxidized to PbSO4 by the hydroxyl radicals generated on the PbO2 anode, as a result, the darkened PbS becomes lead white. Compared with traditional method based on H2O2 oxidation, the new method possesses local controllability for treated area.
作者
李世荣
李冬妹
凡晓宇
侯诗
胡道道
LI Shirong;LI Dongmei;FAN Xiaoyu;HOU Shi;HU Daodao(School of Materials Science and Engineering Xi＇an 710119,Shaanxi,2 Army Academy of Border and Coastal Defence,Shaanxi Normal University,China;Xi＇an 710108,Shaanxi,China)
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第6期68-73,共6页
Journal of Shaanxi Normal University：Natural Science Edition
基金
国家自然科学基金(21773150)
关键词
纸质文物
铅白
返铅
电解
paper cultural relics
lead white
lead white darkening
electrolysis
