改性粉煤灰处理含铜废水的研究

Study on Treatment of Copper-Containing Wastewater by Modified Fly Ash

采用NaOH溶液对粉煤灰进行改性,并研究了粉煤灰和改性粉煤灰对Cu^(2+)的吸附性能。考察了反应时间、吸附剂投加量及溶液pH值对吸附过程的影响,同时研究了粉煤灰和改性粉煤灰吸附Cu^(2+)的动力学和等温线。结果表明:改性后,粉煤灰的吸附性能显著提高。当反应时间为90min、吸附剂投加量为3g、溶液pH值为9时,改性粉煤灰对Cu^(2+)的去除率达到99%以上。粉煤灰和改性粉煤灰对Cu^(2+)的吸附符合拟二级动力学模型和Langmuir吸附等温模型,即符合单分子层吸附理论。

NaOH solution was used as the modifier for fly ash. The adsorption properties of Cu2＋ by fly ash and modified fly ash were studied, and the effects of reaction time, dosage of adsorbent and initial pH value of solution on adsorption process were investigated. Meanwhile, the kinetics and isotherms of Cu2＋ adsorption by fly ash and modified fly ash were investigated. Results showed that the adsorption property of modified fly ash was significantly improved, and the removal rate of Cu2＋ could reach more than 99% when reaction time was 90 rain, dosage of adsorbent was 3 g and initial pH value of solution was 9. The adsorption of Cu2＋ by fly ash and modified fly ash agreed with the pseudo-second-order kinetic model and the Langmuir adsorption isothermal model, and that squared with single molecule layer adsorption theory.