摘要:
研究了pH、吸附时间、竹炭投加量、邻氯酚初始浓度和吸附温度对不同炭化温度(500℃、700℃和900℃)下烧制的竹炭对邻氯酚的吸附特性的影响.结果表明,低pH值有利于3种竹炭对邻氯酚的吸附,其平衡吸附量均随初始浓度和吸附温度增大而增加,相同条件下,吸附量的大小依次为q900℃q500℃q700℃;500℃和700℃炭化温度下烧制的竹炭对邻氯酚的吸附表现出相似的变化规律,吸附时间为13h时基本达到平衡,而900℃炭化温度下烧制的竹炭的吸附则是一个快速吸附过程,30min内即达到吸附平衡;3种竹炭对邻氯酚的吸附皆是一个吸热过程,实验进行的吸附温度下,其吸附量的大小依次为q40℃q25℃q15℃.
关键词:
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竹炭
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炭化温度
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吸附量
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2氯-酚
Abstract:
Adsorption properties of o-chlorophenol onto bamboo charcoal carbonized at 500℃,700℃ and 900℃ were investigated.The effect of various parameters such as pHvalue,adsorption time,adsorbent dosage,initial concentration of o-chlorophenol and adsorption temperature was studied.The results indicated that the bamboo charcoal at all carbonizing temperatures were more effective in adsorbing o-chlorophenol under low pHvalues,and the equilibrium adsorption capacity increased with increasing initial concentration of o-chlorophenol and adsorption temperature.Under the same conditions,the order of adsorption capacity of the bamboo charcoal was q900℃q500℃q700℃.The bamboo charcoal carbonized at 500℃ and 700 ℃ had similar adsorption characteristics,and approached equilibrium after about 13h.The adsorption process of o-chlorophenol onto bamboo charcoal carbonized at 900℃ was a rapid reaction,and reached equilibrium after 30min.The adsorption reaction of o-chlorophenol onto all the bamboo charcoals were endothermic,and the order of adsorption capacity was q40℃q25℃q15℃.
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