Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan, PR China.
Bioresour Technol. 2010 Nov;101(22):8558-64. doi: 10.1016/j.biortech.2010.06.060.
To develop the agricultural by-product adsorbent that possesses anionic exchangeable function, the performance of a new anion exchanger prepared from wheat straw (WS) was evaluated in this study. Wheat straw anion exchanger (WS-AE) was prepared by the grafting of aminated intermediate onto WS. Results indicate that reaction time and temperature in the chemical modification process both affected the preparation of aminated intermediate and WS-AE. FTIR, nitrogen content, solid-state (13)C NMR and zeta potential data validated the existence of grafted amine group in the structure of WS-AE. The maximum sorption capacities of WS-AE for nitrate and phosphate were approximately 52.8 and 45.7mgg(-1), respectively, which shows higher maximum capacity for phosphate and a similar capacity for nitrate in comparison with commercial anion resins. Regeneration studies and column adsorption tests were performed, and the excellent regeneration and column adsorption capacities provided strong evidence of the potential of WS-AE for the technological applications of phosphate and nitrate removal from aqueous solutions.
为了开发具有阴离子交换功能的农业副产品吸附剂，本研究评估了一种由麦草（WS）制备的新型阴离子交换剂的性能。麦草阴离子交换剂（WS-AE）是通过氨基中间体制备的接枝到 WS 上制备的。结果表明，化学修饰过程中的反应时间和温度都会影响氨基中间体制备和 WS-AE 的制备。FTIR、氮含量、固态（13）C NMR 和 zeta 电位数据验证了接枝胺基在 WS-AE 结构中的存在。WS-AE 对硝酸盐和磷酸盐的最大吸附容量分别约为 52.8 和 45.7mgg(-1)，与商业阴离子树脂相比，其对磷酸盐的最大容量较高，对硝酸盐的容量相似。进行了再生研究和柱吸附试验，良好的再生和柱吸附能力为 WS-AE 从水溶液中去除磷酸盐和硝酸盐的技术应用提供了有力证据。
