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微型舱模拟室内环境中活性炭净化甲醛的能力

Keywords: 活性炭,甲醛,吸附规律,指数递减

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Abstract:

利用微型实验舱(0.04m3)模拟室内甲醛环境进行活性炭吸附实验,研究吸附后甲醛浓度随时间的变化趋势,计算活性炭对甲醛的净化效率、吸附速率和饱和吸附量,探索活性炭对室内甲醛的吸附规律。研究发现,当甲醛含量为0~0.40mg,活性炭用量为0.5g时,舱内甲醛浓度随时间延长呈指数递减变化趋势,吸附后0~0.5h甲醛浓度递减得最快,0.5~2h递减速度变缓,2~4h甲醛浓度基本上保持不变;研究E0A1、E1A4曲线斜率K及活性炭甲醛净化效率发现,每次吸附过程活性炭吸附2h可达到吸附平衡,活性炭进行3次吸附平衡即可达到吸附饱和,每次实验第一次吸附过程、每次吸附过程前半小时活性炭对甲醛的吸附能力最强;活性炭的吸附速率在吸附初期迅速降低,最后趋近于0;等量椰壳活性炭在一定浓度的污染物环境中饱和吸附量是个定值。说明使用活性炭净化室内甲醛有一定的规律可循。

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