A mixed oxide of cobalt ferrite (CoFe₂O₄) was prepared by coprecipitation method in absence and presence of fulvic acid at pH 6 (F6) and 8 (F8), respectively. The as-prepared nano-materials were used as adsorbents for a textile dye (Remazole-Red, RR dye) from aqueous solution. The adsorption process was in good agreement of pseudo-second order kinetic model and Freundlich isotherm. The factors affecting the dye adsorption were discussed. The preparation of CoFe₂O₄ via co-precipitation method was modified using fulvic acid and calcinations were performed at 300 °C and 500 °C to yield F8 and F6, respectively. The adsorbents exhibited maximum removal efficiency of Remazole-Red, which reached 99.5% under optimized conditions. Thus, the modified synthetic route of the adsorbents and calcinations conditions will be discussed in the current work to correlate with the fast adsorption kinetics, recycling and high adsorption capacity of the novel adsorbents, F8 and F6.

中文翻译：

---

使用在黄腐酸存在下制备的钴铁氧体纳米颗粒增强从水溶液中去除纺织品染料

在不存在和存在黄腐酸的条件下，分别在pH 6（F6）和8（F8）下，通过共沉淀法制备了钴铁氧体的混合氧化物（CoFe ₂ O ₄）。所制备的纳米材料被用作水溶液中的纺织染料（Remazole-Red，RR染料）的吸附剂。吸附过程与拟二级动力学模型和Freundlich等温线吻合良好。讨论了影响染料吸附的因素。CoFe ₂ O ₄的制备通过共沉淀法，用黄腐酸改性，并在300℃和500℃下煅烧，分别得到F8和F6。吸附剂表现出最大的Remazole-Red去除效率，在优化条件下达到了99.5％。因此，将在当前工作中讨论吸附剂的改良合成路线和煅烧条件，以与新型吸附剂F8和F6的快速吸附动力学，循环利用和高吸附容量相关联。