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为了考察热处理温度、保温时间对竹材的颜色和吸附性能的影响以及颜色变化与热处理竹材吸附性能之间的相关性,本文以毛竹为试材,采用6种处理温度(120℃、140℃、160℃、180℃、200℃、220℃)和4种保温时间(1h、2h、3h、4h)分别对其进行热处理。根据标准色度学系统(CIEL*a*b*)采集热处理前后竹材表面色度学参数,通过激光散射粒子加速测量法定期监测密闭亚克力箱内的烟气PM2.5数值变化,并计算热处理竹材的吸附效率,采用扫描电镜(SEM)分析竹材热处理前后内部结构的变化。结果表明:1)随着热处理温度或保温时间的增加,热处理竹材表面颜色变深,其中温度的影响效果更大;2)热处理竹材表面明度值(L*)与色差(ΔE*)存在相关关系,L*值为主要变化色度学参数;3)随着热处理温度升高,竹材的吸附性能增强,竹材表面L*值与其吸附效率之间存在显著线性关系(R2=0.99);4)高温热处理使竹材内部孔隙增加,细胞壁分层化且被分解产物附着,表面积增大,吸附能力增强。
In order to investigate the effect of heat treatment temperature and holding time on the color and adsorption properties of bamboo and the correlation between color change and heat treatment bamboo adsorption properties, this paper took six kinds of treatment temperature (120 ℃, 140 ℃, 160 ℃, 180 ℃, 200 ℃, 220 ℃) and 4 kinds of holding time (1h, 2h, 3h, 4h). According to the standard colorimetric system (CIEL * a * b *), the surface colorimetric parameters of bamboo before and after heat treatment were collected, and the PM2.5 value in the closed acrylic tank was regularly monitored by laser scattering particle acceleration measurement. Of the adsorption efficiency, the use of scanning electron microscopy (SEM) analysis of the internal structure of bamboo before and after heat treatment changes. The results showed that: 1) the surface color of bamboo treated by heat treatment became deeper with the increase of heat treatment time or holding time, and the influence of temperature was more significant; 2) There was a correlation between the surface lightness value (L *) and color difference (ΔE *) of bamboo treated by heat treatment , And L * values are the main colorimetric parameters. 3) The adsorption capacity of bamboo increased with the increase of heat treatment temperature. There was a significant linear relationship between L * value and adsorption efficiency (R2 = 0.99). 4) Heat treatment increased the internal porosity of the bamboo, cell wall stratification and decomposition products were attached, the surface area increases, the adsorption capacity increased.