竹材化学预处理对其表面纳米TiO_(2)生长行为研究

Effects of Chemical Pretreatment on the Growth of TiO_(2) Nanoparticles on the Bamboo Surface

以NaOH、HCl及NaCl为预处理介质,采用不同的溶液浓度(0.1%、1%、4%、8%),对竹材处理前后的主要化学组分进行对比分析,并通过傅里叶变换衰减全反射红外光谱(FTIR-ATR)、X射线光电子能谱(XPS)和扫描电子显微镜(SEM)进一步证实化学预处理前后竹材化学组分、形貌的变化,以获得不同的化学预处理介入下竹材化学成分的主要变化规律和机理,从而进一步探明化学预处理后对竹材表面纳米TiO_(2)生长行为的影响。结果表明:在10 min内,相较于竹材素材、HCl和NaCl处理的竹材,NaOH处理的竹材在1730 cm^(-1)和1238 cm^(-1)处的特征峰变化明显,且随溶液浓度的升高而逐渐降低;根据XPS结果可知4%浓度的NaOH处理竹材后,竹材表面的羟基(-OH)可被Na离子完全取代,增加浓度至8%,不会继续增加Na元素的含量;此外,通过SEM和XPS证明,NaOH预处理竹材对其后期TiO_(2)纳米粒子的负载有促进作用。

Using NaOH,HCl,and NaCl as pretreatment reagents,under different solution concentrations(0.1%,1%,4%,8%),the main chemical components of bamboo before and after treatment were analyzed.The changes in the chemical composition and morphology of the bamboo before and after chemical pretreatment were characterized by Fourier transform infrared-attenuated total reflectance spectroscopy(FTIR-ATR),X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy(SEM)to obtain the main change and mechanism.Furthermore,the influence of chemical pretreatment on the growth of TiO_(2) nanoparticles on the bamboo surface was investigated.The results showed that after 10 min treatments,compared with original bamboo,HCl and NaCl-treated bamboo,the characteristic peaks of NaOH-treated bamboo at 1730 cm^(-1) and 1238 cm^(-1) were changed significantly,decreasing gradually with the increase of NaOH solution concentration.According to the XPS results,the hydroxyl(-OH)on the bamboo surface can be completely replaced by Na ions after 4%NaOH treatment.Increasing the concentration to 8%will not continue to increase the Na content.In addition,the SEM and XPS results indicated that the NaOH pretreatment can promote the loading of TiO_(2) nanoparticles on the bamboo surface.