粉煤灰处理含钼废水的效果及吸附机理研究

利用粉煤灰对模拟的含钼废水进行除钼吸附实验,分别研究了吸附过程中溶液pH值、吸附剂投加量对吸附效果的影响,并对吸附等温方程及动力学进行了探讨。结果表明,在吸附质钼初始浓度为10mg/L、pH=3.1条件下,粉煤灰对钼的吸附效果最好,除钼率为74.3%;对于50mL的含钼溶液,当吸附剂投加量为2.5g时除钼率达到最高值85.4%。粉煤灰对钼的吸附符合Langmuir吸附等温方程,以表面单分子层吸附为主;吸附过程符合二阶动力学模型,同时具有物理吸附和化学吸附的特征。

Molybdenum-containing Wastewater Treatment Effect of Fly Ash and its Adsorption Mechanism

Molybdenum removal experiments of simulated molybdenum-containing wastewater were carried out with fly ash as the absorbent.Influences of absorption pH and absorbent dosage on adsorption results were studied,and the adsorption isotherm equation and kinetics were discussed.The results show that the adsorption effect of fly ash for molybdenum is best with a molybdenum removal rate of 74.3%,under the conditions of molybdenum initial concentration 10 mg/L and pH=3.1.The addtion of 2.5 g absorbent into 50 mL molybdenum-containing solution resultes in optium molybdenum removal up to 85.4%.Molybdenum adsorption on fly ash conforms with Langmuir adsorption isotherm equation,dominated by surface single-molecule layer adsorption.The adsorption kinetic data are fitted with second-order kinetic model,representing the characteristics of both physical adsorption and chemisorption.