杉木间伐材炭化物特性及其对挥发性有机污染物吸附性能的研究

Study on properties of Chinese fir thinning wood charcoals andits adsorption capacities for VOC polluting substances

探讨了炭化温度对杉木间伐材炭化物的得率、还原性、pH值、比表面及对苯蒸汽和三氯甲烷蒸汽吸附率的影响.结果表明,在400～900℃,随着炭化温度升高,炭化物的得率下降,比表面积、元素组成中(C+H)/O的摩尔比值、水溶液的pH值均逐步增加,900℃的炭化物比表面积可达800m2·g-1.炭化温度对炭化物的环境净化能力有显著影响.对三氯甲烷蒸汽的吸附率以600℃的炭化物最大,高达8.5%.而对苯蒸汽的吸附率随炭化温度的升高而递增,800℃炭化物的吸附率可达10.0%.同时,结合红外光谱得出的炭化物微观特性,对炭化物的性能变化规律作了分析.

The effects of charring temperature on the yield, reduction, pH value, specific surface area of charcoal and its adsorption capacities for benzene vapor, chloroform vapor were investigated. The results showed, the specific surface area, ratio of (n_C+n_H)/n_O and pH value of charcoal samples increased with the raise of carbonization temperature. The charcoal with specific surface area 800?m^2·g^(-1) was got under 900?℃. The largest adsorption capacities for chloroform vapor was 8.5%, observed at the charcoal charred at 600?℃. The benzene vapor adsorption capacities was increased with the raise of carbonization temperature, peaking at 800?℃, the adsorption capacity was 10.0%. In addition, by analysis of FTIR spectrums, the micro-structure and characters of charcoals are explained.