Research on the Adsorption Performance of Microwave Combined with Alkali Modified Fly Ash for Cr(Ⅵ)
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摘要:
为了强化改性粉煤灰在重金属废水处理中的吸附效果，利用微波联合碱改性的方法，研究微波温度、微波时间、微波功率等制备条件对改性粉煤灰吸附铬(Ⅵ)的影响以及吸附等温特性。结果表明，粉煤灰改性的最佳制备条件为：微波功率600 W，微波温度60℃，微波时间15 min，吸附量达到0.341 mg/g，较改性前提高50%以上。此改性条件下的粉煤灰进行吸附等温的试验研究结果表明，其对铬(Ⅵ)的吸附符合Freundlich和Langmuir等温吸附模型，此吸附过程为单分子层吸附。粉煤灰具有较高的经济性，可广泛用于含铬(Ⅵ)废水的处理。
Abstract:In order to enhance the adsorption effect of modified fly ash in heavy metal wastewater treatment, microwave combined with alkali modification methods was used to study the effects of microwave temperature, microwave time, microwave power and other preparation conditions on the adsorption and the adsorption isotherm characteristic of modified fly ash on Cr(Ⅵ). The results showed that the optimal modified fly ash could be obtained under the conditions of microwave power of 600 W, microwave temperature of 60℃, microwave time of 15 min. The adsorption amount reached 0.341 mg/g, which was more than 50% higher than before modification. The experimental results of adsorption isothermal adsorption of fly ash under this modified condition showed that the adsorption of Cr(Ⅵ)accorded with the isotherm adsorption model of Freundlich and Langmuir, and the adsorption process was monolayer adsorption. Fly ash is highly economical and can be widely used in the treatment of wastewater containing Cr(Ⅵ).
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Key words:
- microwave-assisted alkali fly ash /
- Cr(Ⅵ) /
- adsorption /
- preparation /
- sorbents
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表 1 粉煤灰的化学成分
Table 1. Chemical composition of fly ash
化学成分 SiO2 Fe2O3 Al2O3 CaO TiO2 K2O MgO BaO MnO Others 含量/% 54.10 17.50 11.60 11.30 2.69 1.18 0.19 0.16 0.13 1.15 
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表 2 Freundlich和Langmuir等温吸附模型相关参数
Table 2. Parameters of Freundlich and Langmuir isothermal adsorption model
Freundlich isotherm
log Qe=0.813 0 log Ce-1.020 0Langmuir isotherm
1/Qe=15.368 4/Ce+0.043 6K 1/n R Xm b R 0.095 5 0.813 0 0.993 0 5.976 2 0.117 7 0.988 8
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表 3 不同吸附剂对铬(Ⅵ)的吸附量
Table 3. The adsorption amount of Cr(Ⅵ) with different adsorbent
吸附剂 比表面积/(m2·g-1) 吸附量/(mg·g-1) 未改性粉煤灰 6.104 0.225 改性粉煤灰 20.185 0.341 沸石 600 2.4
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