改性坡缕石黏土对水中木质素磺酸钠吸附研究

Removal of Sodium Lignosulfonate from Aqueous Solution Using Modified Palygorskite as Adsorbent

摘要:

通过利用盐酸和焙烧处理的方法对坡缕石黏土进行了改性，制备了酸处理坡缕石黏土和热处理坡缕石黏土，利用XRD和TEM对不同方法处理的坡缕石黏土进行了结构和形貌表征，并使用黏土对木质素磺酸盐废水进行了吸附研究。吸附实验表明：在盐酸浓度为1.0 mol/L，60~70℃，改性处理6 h条件下制得的吸附剂相对原土及热处理的坡缕石黏土吸附效果最好，动力学研究表明吸附过程符合准二级动力学模型，吸附等温线符合Langmuir吸附模型，其平衡吸附量可达到93.97 mg/g。实验证明该吸附过程是一个放热过程。

Abstract:

Palygorskite clays were treated by different concentration of hydrochloric acid and calcinated at different temperatures. The modified Palygorskite clays were characterized by XRD and TEM, which were used as adsorbents for removal of sodium lignosulfonate from aqueous solutions. The adsorption experiments showed that the modified palygorskite clays which was treated with the concentration of 1.0 mol/L hydrochloric acid at 60~70℃for 6 h had the best adsorption performance compared with raw palygorskite clays and the calcinated ones. The absorption processes follow pseudo-second order kinetic model very well and absorption isotherms fit Langmuir equation. The apparent maximum adsorption capacity was 93.97 mg/g. The results indicate that the adsorption process is exothermic.