Huang Xiaolu, Zhang Mei, Wang Minghui, Wen Zhuoyu, Jiang Yamei, Sui Yunhao, Ma Jun, Liao Yang, Li Xiaoting
College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, People's Republic of China.
Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education of China, Chengdu, 610068, People's Republic of China.
Sci Rep. 2024 Sep 8;14(1):20901. doi: 10.1038/s41598-024-71767-8.
Nowadays, human activities intensified the combined pollution of fluoride and lead in acidic tea garden soil. The key to eliminating this combined pollution is to immobilize pollutants simultaneously, thus preventing their migration from tea garden soil to tea trees. In this paper, the natural product bayberry tannin was employed as raw material to fabricate functional materials (TF-Zr) for simultaneous adsorption of fluorine (F) and lead (Pb) in water and soil by the reactivity of tannin with Pb and the affinity of Zr with F. SEM-Mapping, EDS, FT-IR, XPS were utilized to probe the immobilization mechanisms. The results showed that TF-Zr could simultaneously and efficiently adsorb F and Pb from water with the adsorption capacity of 5.02 mg/g (Pb) and 4.55 mg/g (F). The adsorption processes were both in accordance with the proposed secondary kinetic adsorption model. Besides, the presence of F promoted the adsorption of Pb by TF-Zr. The materials were applied into tea garden soil to explore its effect on the variation of F and Pb forms in the soil. It was found that the proportion of water-soluble fluorine, exchangeable fluorine and exchangeable lead in the tea garden soil decreased significantly, while the proportion of residual fluorine and lead increased evidently, illustrating TF-Zr possessed eximious fixation effect on the highly reactive fluorine and lead in the soil and facilitated their conversion to the more stable residue state. Therefore, TF-Zr can be used for the efficient and simultaneous immobilization of fluorine and lead in water and tea garden soil.
如今，人类活动加剧了酸性茶园土壤中氟和铅的复合污染。消除这种复合污染的关键在于同时固定污染物，从而防止它们从茶园土壤迁移至茶树。本文以天然产物杨梅单宁为原料，利用单宁与铅的反应性以及锆与氟的亲和性，制备了用于同时吸附水和土壤中氟（F）和铅（Pb）的功能材料（TF-Zr）。利用扫描电子显微镜-能谱分析（SEM-Mapping）、能谱仪（EDS）、傅里叶变换红外光谱仪（FT-IR）、X射线光电子能谱仪（XPS）探究固定化机制。结果表明，TF-Zr能够同时高效地从水中吸附氟和铅，对铅的吸附容量为5.02 mg/g，对氟的吸附容量为4.55 mg/g。吸附过程均符合拟二级动力学吸附模型。此外，氟的存在促进了TF-Zr对铅的吸附。将该材料应用于茶园土壤，探究其对土壤中氟和铅形态变化的影响。结果发现，茶园土壤中水溶性氟、交换性氟和交换性铅的比例显著降低，而残留氟和铅的比例明显增加，说明TF-Zr对土壤中高活性的氟和铅具有优异的固定效果，促进它们转化为更稳定的残留态。因此，TF-Zr可用于高效同时固定水和茶园土壤中的氟和铅。
