TiO_(2)@SiO_(2)-脱木素木材的制备及其耐光性增强  

Preparation and Enhanced Photostability of TiO_(2)@SiO_(2)-Delignified Wood

作　　者：朱亮亮 陈太安[2] 郑永军 张凯睿 张钧 郑梅 郑荣波 Zhu Liangliang;Chen Tai’an;Zheng Yongjun;Zhang Kairui;Zhang Jun;Zheng Mei;Zheng Rongbo(Yunnan Province Key Laboratory of Wood Adhesives and Glued Products,College of Chemical Engineering,Southwest Forestry University,Kunming 650224;College of Materials Engineering,Southwest Forestry University,Kunming 650224;School of Marine Science and Technology,Shanwei Polytechnic,Shanwei 516600)

机构地区：[1]云南省木材胶黏剂及胶合制品重点实验室西南林业大学化学工程学院,昆明650224 [2]西南林业大学材料工程学院,昆明650224 [3]汕尾职业技术学院海洋学院,汕尾516600

出　　处：《林业科学》2022年第3期129-138,共10页Scientia Silvae Sinicae

基　　金：云南省基础研究计划重点项目(202001AS070041);国家自然科学基金项目(31100420)。

摘　　要：【目的】在二氧化钛(TiO_(2))颗粒表面包覆光惰性物质二氧化硅(SiO_(2)),制备出具有抑制纳米TiO_(2)固有的光催化活性、仍保留其原有的紫外屏蔽、可见光透明特性、具有核壳结构、单分散、小尺寸纳米TiO_(2)@SiO_(2),用于抑制脱木素木材(DW)中残留木质素的光老化,制备耐光型TiO_(2)@SiO_(2)-脱木素木材(TiO_(2)@SiO_(2)-DW),以提高DW基功能材料的耐光性,延长其使用寿命、木材高值化及碳达峰、碳中和,为经典、普适液-固-液(LSS)法制备的单分散、脂肪酸保护的其他小尺寸纳米颗粒表面的SiO_(2)包覆、改性及功能化提供可行方案。【方法】采用LSS法制备单分散、尺寸约8 nm、表面吸附油酸分子、分散在环己烷中、锐钛矿相纳米TiO_(2);反向微乳液法在TiO_(2)纳米颗粒表面包覆SiO_(2),制备出单分散、粒径约12 nm、分散在乙醇中、具有核壳结构的纳米TiO_(2)@SiO_(2);H_(2)O_(2)/HAc除木质素法去除木材中的木质素,且仍保留木材原有纤维素骨架,得到H_(2)O_(2)/HAc-脱木素木材(H_(2)O_(2)/HAc-DW);将TiO_(2)@SiO_(2)浸渍、涂覆在H_(2)O_(2)/HAc-DW表面并机械压制,制备出TiO_(2)@SiO_(2)-DW;TEM、XRD、FTIR和UV-Vis分别表征纳米TiO_(2)、TiO_(2)@SiO_(2)的形貌/单分散性、晶体结构、表面官能团以及UV-Vis吸收性能;SEM和EDS表征TiO_(2)@SiO_(2)在DW表面的沉积、分布;L^(*)a^(*)b^(*)色差法测量老化前后的色度值、计算总色差ΔE^(*),评估DW、TiO_(2)@SiO_(2)-DW的耐光性。【结果】TEM表明,纳米TiO_(2)、TiO_(2)@SiO_(2)均为单分散性,尺寸分别为8 nm和12 nm;相机照片表明,纳米TiO_(2)、TiO_(2)@SiO_(2)可分别分散在环己烷、乙醇中;XRD表明,TiO_(2)、TiO_(2)@SiO_(2)均为锐钛矿相,SiO_(2)壳层为无定形结构;UV-Vis表明,TiO_(2)@SiO_(2)具有UV屏蔽、可见光透明特性;H_(2)O_(2)/HAc-DW中的木质素残留量减少至0.8%;SEM和EDS表明,TiO_(2)@SiO_(2)均匀沉积/镶嵌在DW表面;相机照片表明,TiO_(2)@S【Objective】In order to prepare TiO_(2)@SiO_(2)-delignified wood(TiO_(2)@SiO_(2)-DW)with an enhanced photostability by suppressing photodegradation of remaining lignin in DW,SiO_(2),a kind of UV light inert material,was coated on the surface of TiO_(2) nanoparticles to form monodispersed TiO_(2)@SiO_(2) with core@shell structure to suppress inherent photocatalytic activity of TiO_(2),to remain UV shielding,Vis light transparent properties.【Method】The monodispersed,anatase TiO_(2) nanoparticles with size of about 8 nm,which modified with oleic acid,dispersed in cyclohexane,were prepared by liquid-solid-solution(LSS)method.Reverse microemulsion method was used to deposit SiO_(2) onto the surface of as-prepared TiO_(2) nanoparticles to form monodispersed TiO_(2)@SiO_(2) with size of about 12 nm,core@shell structure,and a good dispersity in ethanol.The lignin was removed from natural wood by H_(2)O_(2)/HAc delignification method to form DW with well-preserved cellulose skeleton.TiO_(2)@SiO_(2) was soaked/coated on the surface of DW,and subsequently mechanical pressing to form TiO_(2)@SiO_(2)-DW.TEM,XRD,FTIR,and UV-Vis were used to characterize morphology/monodispersity,crystallized phase,functional groups,and UV-Vis absorbance properties of both TiO_(2) and TiO_(2)@SiO_(2).SEM and EDS were used to demonstrate the coating of TiO_(2)@SiO_(2) on the surface of DW.Parameters of L^(*)a^(*)b^(*) of DW and TiO_(2)@SiO_(2)-DW were used to evaluate the photostability.【Result】TEM images demonstrates that both TiO_(2) and TiO_(2)@SiO_(2) possess monodispersity with particle size of 8 and 12 nm,respectively.The photos reveal that both TiO_(2) and TiO_(2)@SiO_(2) have a good dispersity in cyclohexane and ethanol,respectively.XRD analysis indicates that the crystallized phase of TiO_(2) core and SiO_(2) shell are anatase and amorphous,respectively.UV-Vis reveals that,TiO_(2)@SiO_(2) possess both UV shielding and Vis light transparent properties.Remaining lignin content of DW is as low as 0.8%.SEM/EDS and photos demonstr

关 键 词：TiO_(2)@SiO_(2) 脱木素木材 耐光性 

分 类 号：S781.72[农业科学—木材科学与技术]