Search

Herein, a hydrogen‐bonded cobalt porphyrin framework is presented that can efficiently host iodine and serve as an electrocatalyst for aqueous zinc‐iodine (Zn‐I2) organic batteries. The Fourier Transform infrared spectroscopy (FT‐IR), X‐ray Photoelectron Spectroscopy (XPS), and Density functional theory (DFT) results demonstrate that hydrogen‐bonded organic frameworks (HOFs) possess excellent adsorption properties for iodine species. In situ Raman spectroscopy illustrates that the redox mechanism of Zn‐I2 battery depends on the redox reaction of I/I−, with I3−/I5− serving as intermediary products. The in situ Ultraviolet‐visible (UV–vis) spectroscopy further reveals that HOFs restrict polyiodide solubilization. The aqueous Zn‐I2 organic batteries with I2@PFC‐72‐Co cathodes exhibit excellent rate capability, achieving 134.9 mAh g−1 at 20 C. Additionally, these batteries demonstrate long‐term cycle stability, enduring > 5000 cycles at 20 C. The impressive electrochemical performance of I2@PFC‐72‐Co can be attributed to the cooperative Co single‐atom (CoSA) electrocatalyst in the HOF‐Co structure. Moreover, the benzene ring structure and the carboxyl functional group of HOFs possess a strong ability to adsorb iodine and iodide. Owing to these synergistic effects, the aqueous Zn‐I2 batteries with the I2@PFC‐72‐Co cathode exhibit excellent electrochemical performance. [ABSTRACT FROM AUTHOR]

The aminated sodium lignosulfonate (AELS) was prepared through a Mannich reaction and characterized via FT-IR, TG, SEM and XPS in this study. Subsequently, the adsorption capacity of AELS for methyl blue (MB) was evaluated under various conditions such as pH, adsorbent dosage, contact time, initial concentration and temperature. The adsorption kinetics, isotherms and thermodynamics of AELS for methyl blue were investigated and analyzed. The results were found to closely adhere to the pseudo-second-order kinetic model and Langmuir isotherm model, suggesting a single-molecular-layer adsorption process. Notably, the maximum adsorption capacity of AELS for methyl blue (153.42 mg g−1) was achieved under the specified conditions (T = 298 K, MAELS = 0.01 g, pH = 6, VMB = 25 mL, C0 = 300 mg L−1). The adsorption process was determined to be spontaneous and endothermic. Following five adsorption cycles, the adsorption capacity exhibited a minimal reduction from 118.99 mg g−1 to 114.33 mg g−1, indicating good stability. This study contributes to the advancement of utilizing natural resources effectively and sustainably. [ABSTRACT FROM AUTHOR]