牛血清白蛋白纳米球接枝杨梅单宁的制备以及吸附去除水体中Pb2+的性能

采用去溶剂法和杨梅单宁-戊二醛固化接枝制备得到杨梅单宁（BT）接枝牛血清白蛋白（BSA）纳米球（BSA-BT-NSs）吸附材料，并系统探讨了其在不同吸附条件下对水体中Pb²⁺的吸附去除性能。研究结果表明：50%用量杨梅单宁（基于BSA-NSs量）接枝固化得到的BSA-BT-NSs具有较好的球形结构和良好的分散性。在吸附实验中，Pb²⁺初始浓度为250mg/L、pH 5.0、温度为298K 条件下吸附20min，BSA-BT-NSs（0.4g/L）对Pb²⁺的吸附效果最佳，最大吸附容量为76mg/g，优于多数同类型吸附材料。BSA-BT-NSs对Pb²⁺吸附过程符合Langmuir方程和准二级吸附动力学模型，且吸附后的BSA-BT-NSs经0.1mol/L 硝酸进行解吸取得了92.04％的良好解吸效果，并可再次重复使用。进一步分析其Pb²⁺吸附机理，表明BSA-BT-NSs中的氨基氮原子、羟基和羧基氧原子作为电子供体参与了与Pb²⁺的空轨道发生配位作用。

Removal of Pb2+ from aqueous solution using bovine serum albumin nanospheres grafted with bayberry tannin

Bayberry tannin grafted bovine serum albumin nanaopheres (BSA-BT-NSs) were prepared using the desolvent method, and the removal performances of Pb²⁺ onto BSA-BT-NSs were investigated systematically under different removal conditions, including pH, adsorbent dose, contact time, and initial Pb²⁺ concentration. The results showed that BSA-BT-NSs dispersed uniformly having a good spherical structure grafting with 50% of bayberry tannin (based on the amount of BSA-NSs). The maximum adsorption capacity of BSA-BT-NSs for Pb²⁺ reached up to 76mg/g using 0.4g/L of adsorbent dosage to treat the Pb²⁺ containing solution with the initial concentration of 250mg/L at pH 5.0 and 298K for 20min．The adsorption processes of Pb²⁺ onto BSA-BT-NSs were well-fitted to Langmuir model and pseudo-secondary adsorption kinetics model, indicating a single layer chemical adsorption. A desorption efficiency of 92.04% was obtained using 0.1mol/L nitric acid as eluent to carry out the desorption experiments of Pb²⁺ on BSA-BT-NSs, which could be reused. Furthermore, nitrogen on amino, oxygen on hydroxyl and carboxyl of BSA-BT-NSs were involved as electron donors to form coordination complexes with the empty orbital of Pb²⁺.