The possibility of using magnetic nanoparticles as an adsorbent for the effective removal of anionic dyes from aqueous solutions was investigated. The binding of eosin, tartrazine, and fast green with superparamagnetic Fe₃O₄ nanoparticles was studied using visible spectroscopy. The binding constant and site were obtained from spectrophotometric titration data using the Langmuir model for equilibrium binding. The high binding constants (~10⁵ M^–1) indicated that the magnetic nanoparticles held promise for removing anionic dyes from polluted waters.

中文翻译：

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从分光光度数据计算磁性氧化铁纳米粒子与染料的结合参数

研究了使用磁性纳米粒子作为吸附剂从水溶液中有效去除阴离子染料的可能性。使用可见光谱研究了曙红，酒石黄和快绿与超顺磁性Fe ₃ O ₄纳米粒子的结合。使用朗缪尔模型进行平衡结合，从分光光度滴定数据中获得结合常数和位点。高结合常数（〜10 ⁵ M ^–1）表明磁性纳米粒子有望从污染水中去除阴离子染料。