煤矸石复合吸附剂对Zn^(2+)的吸附性能

Adsorption Capability of Compound Coal Gangue Adsorbent to Zn^(2+)

采用某洗煤厂的煤矸石和天然粘土石灰石作为主要原料,添加适量的氯化铝制备吸附剂对Zn^(2+)进行吸附,运用SEM技术对吸附剂进行了表征,研究了不同因素对Zn^(2+)去除率的影响,并探讨了吸附机理。实验结果表明:当反应温度为20℃、振荡时间为70 min、废水pH为6、吸附剂投加量为0.5 g时,Zn^(2+)去除率达到96.28%。煤矸石复合吸附剂对Zn^(2+)的吸附符合准二级动力学方程,在高浓度时符合Langmuir等温吸附模型低浓度时符合Freundlich等温吸附模型,且吸附是易发生的。

In this study, coal gangue and natural clay limestone from one coal washery was used as the main materials with addition of moderate aluminum chloride for Zn^（2＋） adsorption. The adsorbent was characterized by SEM and the influences of different factors on Zn^（2＋） removal rate were studied. The adsorption mechanism was also discussed. The experimental result showed that when the reaction temperature was 20℃, p H of the wastewater was 6, the adsorbent dosage was 0.5 g, and the oscillating time was 70 min, the removal rate of Zn^（2＋） reached to 96.28%. The adsorption of Zn^（2＋） on the compound coal gangue adsorbent complied with the pseudo-second-order kinetics equation and conformed to the Langmuir adsorption model at high concentration and the Freundlich adsorption model at low concentration, with the adsorption easy to occur.