The application of innovative adsorbents with high adsorption capacity and easy recovery in wastewater treatment has always been of great concern. This study employed κ-carrageenan to enhance the dispersion of magnetic nanoparticles and improve their stability through Ca and Na crosslinkinelg. XRD, FTIR, SEM and EDS revealed that the magnetic nanoparticles were coated with κ-carrageenan. The synthesized MΚC@FeOMNPs exhibited a stable structure and multiple adsorption sites, which was beneficial for the treatment of cationic dyes in wastewater. The absorption results indicated that abundant active sites on the surface of the adsorbent efficiently adsorbed the three cationic dyes. Through optimization experiments, the MΚC@FeOMNPs demonstrated maximum adsorption capacities of 729.9 mg/g, 184.1 mg/g, and 311.0 mg/g for methylene blue, malachite green, and safranin T, respectively. The adsorbent could maintain excellent adsorption efficiency even after 5 cycles of use. The adsorption mechanisms for the three cationic dyes included electrostatic interactions, n-π interactions, and hydrogen bonding. Therefore, the MΚC@FeOMNPs showed highly efficient adsorption and separation of cationic dyes and are suitable candidates for dye wastewater treatment.

中文翻译：

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磁性κ-卡拉胶纳米粒子吸附废水中的阳离子染料


具有高吸附能力、易于回收的创新吸附剂在废水处理中的应用一直备受关注。本研究采用 κ-卡拉胶来增强磁性纳米粒子的分散性，并通过 Ca 和 Na 交联提高其稳定性。 XRD、FTIR、SEM 和 EDS 结果表明磁性纳米颗粒被 κ-卡拉胶包覆。合成的MΚC@FeOMNPs具有稳定的结构和多个吸附位点，有利于废水中阳离子染料的处理。吸附结果表明，吸附剂表面丰富的活性位点有效吸附了三种阳离子染料。通过优化实验，MΚC@FeOMNPs对亚甲基蓝、孔雀石绿和番红T的最大吸附容量分别为729.9mg/g、184.1mg/g和311.0mg/g。该吸附剂即使在使用5个周期后仍能保持优异的吸附效率。三种阳离子染料的吸附机制包括静电相互作用、n-π相互作用和氢键。因此，MΚC@FeOMNPs表现出对阳离子染料的高效吸附和分离，是染料废水处理的合适候选材料。