全国14个竹产区毛竹竹炭理化性质分析

【目的】分析相同制备条件下不同竹产区毛竹竹炭的性能,为全国竹产区毛竹林的分类经营及利用提供理论依据。【方法】在500 ℃条件下用管式炉对全国14个竹产区的毛竹竹秆热解,对比分析不同竹产区竹炭的部分理化性质。【结果】在500 ℃热裂解温度下全国14个竹产区毛竹竹炭得率为18.45%～30.43%、 pH为7.2～7.9、比表面积变化范围为4.48～73.5 m²/g; 不同地区毛竹竹炭中各元素含量都以碳为主,质量分数为70.93%～77.55%,碳氮比(C/N)为72.31～185.18; 14个竹产区竹炭表面基团种类大致相同,且在500 ℃热裂解温度下各竹产区竹炭维持了原始的管状空心结构,但孔隙结构发达程度各地区间差异较大。【结论】全国14个竹产区中贵州赤水地区毛竹烧制竹炭得率最高,浙江安吉地区竹炭滤液pH最高,福建武夷山地区竹炭比表面积最大,湖南东安地区竹炭碳氮比(C/N)最高,广西兴安地区竹炭元素种类最为丰富,包含了此次检测的所有元素种类(C、O、Na、Mg、Si、P、S、Cl、K、Ca、Mn、Cu、Zn、Fe)。在今后竹炭产业的发展过程中,有必要建立各竹产区竹炭理化性质参数数据库,在竹炭产业链延伸过程中,根据各地区竹炭的理化性质加以区别利用。

The characteristics of bamboo charcoal pyrolyzed from moso bamboo culms in 14 bamboo producing areas in China

【Objective】The characteristics of bamboo charcoal in different bamboo producing areas under the same pyro-lysis conditions were analyzed, which provided a theoretical basis for the classification management and utilization of moso bamboo forest. 【Method】The pyrolysis of moso bamboo stalks in 14 bamboo producing areas in China was carried out at 500 °C in tubular furnace, and the characteristics of bamboo charcoal were analyzed. 【Result】 The yield of bamboo charcoal in different bamboo producing areas of China was between 18.45%-30.43%, the pH was between 7.2-7.9, and the specific surface area varied from 4.48 to 73.5 m²/g. The mass ratio of element in bamboo charcoal was mainly carbon, which was between 70.93%-77.55%, and the C/N ratio was between 72.31-185.18. The types of surface functional groups of bamboo charcoal from different bamboo producing areas were almost the same, and the bamboo charcoal in different bamboo producing areas maintained the original tubular hollow structure, but the extent of pore structure development was quite different. 【Conclusion】 The yield of bamboo charcoal in Chishui area of Guizhou Province was the biggest. The pH of bamboo charcoal filtrate in Anji area of Zhejiang Province was the highest. The specific surface area of bamboo charcoal in Wuyishan area of Fujian Province was the biggest. The C/N ratio of bamboo charcoal in Dongan area of Hunan Province was the biggest. The element types of bamboo charcoal in Xing’an area of Guangxi Province was the most abundant, which included all the types of tested elements(C, O, Na, Mg, Si, P, S, Cl, K, Ca, Mn, Cu, Zn, Fe).Therefore, in the future development of the bamboo charcoal industry, it is necessary to establish a database of physical and chemical properties of bamboo charcoal in each bamboo producing area. In the process of extending the bamboo charcoal industrial chain, the bamboo charcoal should be differentiated and utilized according to the physical and chemical properties.