改性莴笋叶渣净化空气中甲醛

Indoor purification of formaldehyde by optimized lettuce leaf

通过对莴笋叶2种处理吸附甲醛,得出简便高效的碱热烫处理,并采用二次正交旋转回归组合对其优化,得出煮沸时间25 min、水浴温度80℃、水浴时间2.5 h,莴笋叶渣对甲醛吸附率可达37.05%,实测值36.4%,二者吻合。通过与活性炭、硅藻纯吸附效果比较,优化处理莴笋叶渣与硅藻纯吸附效果相当,均优于活性炭。电镜观测知优化莴笋叶渣与活性炭、硅藻纯均具粗糙、皱褶、疏松结构,傅里叶红外光谱分析出—CC—基团在甲醛吸附中起主要作用。

The most convenient and efficient method is alkali blanching in the study on comparisons of adsorption capacity of formaldehyde by lettuce leaf treated with two different means. Under conditions of boiling time of 25 min,water bath temperature of 80℃,water bath time of 2. 5 h,the adsorption rate of formaldehyde by lettuce leaf reached 37. 05% through further optimization binding the quadratic regression orthogonal rotation combination,the measured value was 36. 4%. Compared with activated carbon,diatom plain and lettuce leaf adsorption effect,the optimized lettuce leaf and diatom plain had equivalent adsorption capacity,both of them were better than activated carbon. The optimized lettuce leaf,activated carbon and diatom plain altogether shared a common structure which was characterized with rough,winkle and loose by SEM. The group called C = C is identified as the mainly functional element in adsorption activity by the FTIR analysis.