Study on Adsorption Properties and Mechanism of Methylene Blue on Coal Fly Ash by Spectrophotometry
Study on Adsorption Properties and Mechanism of Methylene Blue on Coal Fly Ash by Spectrophotometry
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发表时间：
2010
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通讯作者：
T. Feng
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作者：
T. Feng
研究了雁石热电厂燃煤飞灰对亚甲基蓝的吸附。考察了改性后的飞灰、煤粉用量、吸附时间和温度对亚甲基蓝吸附效果的影响。当飞灰投加量为4g/L左右，亚甲基蓝浓度为15 mg/L，温度为25℃时，60分钟左右，亚甲基蓝的降解率可达98%。利用改性后的煤粉吸附废水中的亚甲基蓝，且吸附过程简单。以Freundlich等温线和Langmuir等温线为化学吸附模型，对吸附机理进行了探讨，采用颗粒内扩散模型和准二级动力学模型对实验数据进行了检验，给出了最佳的准二级动力学模型。亚甲基蓝在粉煤灰上的吸附符合二级动力学方程，二级吸附速率常数为0.5758g/(mg·min)，为粉煤灰处理涂料印花废水提供了理论和实践依据。
The adsorption of methylene blue by coal fly ash collected from Yanshi thermal power plant was studied.The influences of modified coal fly ash,quantity of coal fly ash,adsorption time and temperature on the adsorption effect of methylene blue were investigated.When fly ash quantity adds to about 4g/L,methylene blue density 15mg/L,temperature 25℃,around 60 mins,the degradation rate of methylene blue reached 98%.The methylene blue in waste water is successfully absorbed with coal fly ash,and the adsorption procedure is easy,simple and efficient.The adsorption mechanism was discussed based on Freundlich isotherm and Langmuir isotherm as the chemisorption.The intra-particle diffusion model and pseudo-second-order kinetic model have been used to test experimental data,and pseudo-second-order kinetic model is provided the best fit.The kinetics of methylene blue adsorption on the coal fly ash follow the second-order kinetic equation,and the second-order adsorption rate constants is 0.5758g/(mg·min).This provided the theoretical and practical basis for the coal fly ash to deal with pigment printing waste water.