改性花生壳活性炭吸附空气中甲醛性能的研究

Study on the Adsorption Characteristic of Formaldehyde in the Air by Modified PSAC

研究了碳酸钠/亚硫酸氢钠、氢氧化钠和过氧化氢改性的花生壳活性炭对空气中甲醛吸附性能的影响,并通过X射线衍射、傅里叶红外光谱、元素分析和扫描电镜等技术对改性花生壳活性炭结构进行表征。结果表明,经碳酸钠/亚硫酸氢钠、氢氧化钠和过氧化氢改性后的花生壳活性炭,在吸附120min时,其对空气中甲醛去除率分别比未改性花生壳活性炭提高了9.01%、2.54%和6.79%。通过对活性炭结构的表征发现,经碳酸钠/亚硫酸氢钠改性后的花生壳活性炭的甲醛吸附性能最高的原因一方面可能与亚硫酸氢钠与甲醛发生了化学反应有关,另一方面也可能与活性炭晶体结构变化、活性炭比表面积增大和活性炭表面的含氧官能团的增大有关。该研究在花生壳的综合利用、减少环境污染及室内甲醛的去除方面具有重要的现实意义。

The effect of chemical（Na2CO3 / NaHSO3,NaOH,andH2O2）modified activated carbon made from peanut shells（PSAC）on the adsorption characteristic of formaldehyde in the air was investigated. The structural properties of the modifiedPSAC were studied by using X-ray diffraction,fourier infrared spectroscopy,elementary analysis,and scanning electronmicroscope techniques. Results suggested that the formaldehyde（CH2O）adsorption rate of Na2CO3 / NaHSO3,NaOH,andH2O2 modified PSAC increased by 9.01%, 2.54% and 6.79% respectively at 120min as compared with raw PSAC. Structuralanalysis indicated that Na2CO3 / NaHSO3 modified PSAC performed better in removal CH2O,which can be ascribed to thechemical reaction between NaHSO3 and CH2O. On the other hand,changes in PSAC crystal structures as well as increasingthe specific surface area and oxygen functional groups may also increase the CH2O adsorption rate. This study has an importantpractical significance on raising the comprehensive utilization ratio of peanut shells and on reducing the environmentalpollution.