Abstract The high concentration of Fe3+ ions present in ammonium phosphate solutions have a significant effect on product quality and product morphology. Herein, hybrid adsorbents fluor(calcium silicate)/activated carbon (FCS/AC) combined with fluor(calcium silicate) (FCS) and activated carbon (AC) were prepared, characterized, and applied in the removal of Fe3+ ions from ammonium phosphate solutions. FCS/AC held both advantages of FCS and AC indicating a significant adsorption for Fe3+ ions. The adsorption kinetics, isotherms and thermodynamics of Fe3+ onto FCS/AC were investigated. The effect of solution pH, initial Fe3+ concentration, temperature and contact time on the adsorption of Fe3+ onto FCS/AC were also investigated. Desorption-resorption experiments of FCS/AC for Fe3+ ions were examined by the batch method using different eluents. The results showed that FCS/AC was an excellent, low cost and reusable adsorbent for the removal of Fe3+ ions from ammonium phosphate solutions, and the adsorption process appeared to follow the pseudo-second-order kinetic model and Langmuir isotherm model with a maximum Fe3+ adsorption of 15.41 mg/g. Various thermodynamic parameters such as △G0, △H0 and △S0 were calculated indicating the feasibility of the process and spontaneous nature of the adsorption.

中文翻译：

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基于氟（硅酸钙）/活性炭的多孔杂化吸附剂的制备及其在去除磷酸铵溶液中铁（III）中的应用

摘要 磷酸铵溶液中高浓度的 Fe3+ 离子对产品质量和产品形态有显着影响。在此，制备、表征了氟（硅酸钙）/活性炭（FCS/AC）与氟（硅酸钙）（FCS）和活性炭（AC）结合的混合吸附剂，并将其用于去除磷酸铵溶液中的 Fe3+ 离子。 . FCS/AC 兼有 FCS 和 AC 的优点，表明对 Fe3+ 离子有显着吸附。研究了 Fe3+ 在 FCS/AC 上的吸附动力学、等温线和热力学。还研究了溶液 pH、初始 Fe3+ 浓度、温度和接触时间对 FCS/AC 吸附 Fe3+ 的影响。FCS/AC 对 Fe3+ 离子的解吸-再吸收实验通过使用不同洗脱液的分批方法进行检查。结果表明，FCS/AC 是一种优良、低成本、可重复使用的吸附剂，用于从磷酸铵溶液中去除 Fe3+ 离子，吸附过程似乎遵循伪二级动力学模型和 Langmuir 等温线模型，其中 Fe3+ 最大吸附量为 15.41 毫克/克。计算了各种热力学参数，如△G0、△H0 和△S0，表明该过程的可行性和吸附的自发性质。