【摘要】 采用电吸附法对含Cr(Ⅵ)模拟废水进行处理,考察了电极电位、极板间距、极板面积、模拟废水初始Cr(Ⅵ)含量、废水pH等因素对吸附性能的影响,对电吸附过程进行了热力学和动力学拟合,并对电极进行了再生实验。结果表明,在电极电位为1.6 V、极板间距为0.6 cm、极板面积为100 cm2、模拟废水初始Cr(Ⅵ)的质量浓度为20 mg/L、废水pH为2的优化条件下,Cr(Ⅵ)的吸附去除率达到100%;其他因素不变,仅将p H调至2.5,Cr(Ⅵ)的吸附去除率为88.0%,较开路条件下提高了10.7个百分点;电吸附过程更符合Langmuir等温线模型和准2级动力学方程;对活性炭纤维电极进行4次循环电吸附、脱附实验后,其对Cr(Ⅵ)的吸附去除率仍保持在84%以上。更多还原

【Abstract】 The electro-adsorption method was used to treat the simulated wastewater which contained Cr(Ⅵ). The effects of electrode potential, polar plate spacing, polar plate area, initial concentration of Cr(Ⅵ) in wastewater, wastewater pH and other factors on the adsorption properties were investigated.The thermodynamic and dynamic fitting of the electro-adsorption process and the regenerated experiment was carried out on the electrode. The results showed that when the electrode potential was 1.6 V, the spacing of the polar plate was 0.6 cm, the polar plate area was 100 cm2, the initial concentration of the simulated wastewater was 20 mg/L and the wastewater pH was 2, the adsorption removal rate of Cr(Ⅵ) reached 100%. The other factors remain unchanged, only pH was adjusted to 2.5, and the adsorption removal rate of Cr(Ⅵ) was 88.0%, which was 10.7% higher than that under the open circuit condition. The electro-adsorption process was fitted well with Langmuir adsorption isotherm model and was well described by the Quasi-second-order kinetics equation. After four cycles of electroadsorption/desorption experiments on activated carbon fiber electrode, the adsorption and removal rate of Cr(Ⅵ) remained above 84%.更多还原