造纸污泥基纳米复合材料的制备及其对废水中重金属的吸附

Preparation of Papermaking Sludge-based Nanocomposite and Its Adsorption on Heavy Metals in Wastewater

中文关键词:  造纸污泥  壳聚糖  重金属吸附  Cd²⁺  Pb²⁺

Key Words:papermaking sludge  chitosan  heavy metal adsorption  Cd²⁺  Pb²⁺

中文摘要:

      利用造纸污泥与壳聚糖制备造纸污泥-壳聚糖（SL-CSA）纳米复合吸附材料，研究了SL-CSA纳米复合材料对废水中铬离子（Cd²⁺）和铅离子（Pb²⁺）的吸附性能。通过傅里叶变换红外光谱仪（FT-IR）和扫描电子显微镜（SEM）表征证明了复合材料的成功制备。吸附实验表明，SL-CSA纳米复合材料对Cd²⁺和Pb²⁺的吸附均遵循准二级动力学方程，属于化学吸附。根据Langmuir模型，SL-CSA纳米复合材料对Cd²⁺和Pb²⁺的最大吸附量分别为314.05 mg/g和320.06 mg/g。

Abstract:

      Papermaking sludge-chitosan （SL-CSA） nanocomposite adsorption material was prepared by using papermaking sludge and chitosan. The adsorption properties of SL-CSA nanocomposite material on chromium ion （Cd²⁺） and lead ion （Pb²⁺） in wastewater were studied. FT-IR and SEM characterizations proved that the nanocomposite was prepared successfully. The adsorption experiments showed that the adsorptions on Cd²⁺ and Pb²⁺ by SL-CSA nanocomposite material conformed to the pseudo-second-order kinetic equation， which was a chemical-adsorption process. According to Langmuir model， the maximum adsorption capacities of Cd²⁺ and Pb²⁺ by SL-CSA nanocomposite were 314.05 and 320.06 mg/g， respectively.