Processes, Год журнала: 2025, Номер 13(5), С. 1367 - 1367

Опубликована: Апрель 29, 2025

It is of strategic significance to extract germanium (Ge) in an ecological way for sustainable development. Adsorbents that already adsorb Ge have disadvantages such as poor selectivity and low adsorption capacity. In this study, a novel adsorbent material based on rice husk functionalized with tannic acid was developed the efficient extraction from simulated coal fly ash leachate. The capacity acid-functionalized (TA-EPI-ORH) 19.9 times higher than untreated husk, demonstrating significantly improved performance. results showed process by TA-EPI-ORH consistent pseudo-second-order kinetic Freundlich isotherm model. had excellent selective properties, 1.40 mg L−1 exceeding 95% solid-liquid partition coefficients 4380 mL g−1, even presence nine impurity metal ions (average concentration: 479.08 L−1). When compared two main coexistence ions—aluminum (Al) calcium (Ca)—both which relatively highest concentrations (Al: 1594.20 L−1, Ca: 1740.13 L−1), separation factors still maintain high level SF(Ge/Al) = 42.57 SF(Ge/Ca) 39.93. Compared existing studies, exhibits superior performance more interfering ions. After elution adsorbed TA-EPI-ORH, rate initial concentration (1.40 L−1) reached 85.17%, while rates Al Ca were only 1.02% 1.18%, respectively. Further research revealed catechol groups surface formed stable complexes Ge, whereas coexisting (e.g., Al) unstable, thereby ensuring Ge. This green chemistry-based functionalization not enables high-value utilization agricultural waste but also provides eco-friendly strategy recovery.

Язык: Английский