Preformed flocs prepared by using coagulants, i.e. Fe₂(SO₄)₃, MnSO₄.4H₂O, and MnCl₂.4H₂O, were applied as adsorbents for the decolorization of an aqueous C.I. Acid Red 1 dye solution. In order to determine the decolorizing efficiency of different adsorbents, kinetic and equilibrium studies were carried out at the optimum pH. Excellent color removal of 87 % was obtained with Fe₂(SO₄)₃ at pH 4, good color removal of 65 % was achieved with manganese sulfate at pH 10, and moderate color removal of 58 % was obtained with manganese chloride at pH 10, at an optimum sorbent dose of 500 mg L⁻¹ and an equilibrium contact time of 15 min. The sorption data of the equilibrium studies fitted well to the Langmuir isotherm, stating the occurrence of monolayer formation in the adsorption process of dye color removal. The maximum adsorption capacities of ferric sulfate and manganese sulfate are 47.619 and 23.474 mg g⁻¹, respectively. The data of the kinetic studies fitted well to the pseudo-second-order equation, stating that chemisorption is the rate-limiting step.

中文翻译：

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预制絮凝吸附剂在去除水溶液中酸性染料中的应用

将通过使用凝结剂即Fe ₂ (SO ₄ ) ₃、MnSO ₄ .4H ₂ O和MnCl ₂ .4H ₂ O制备的预形成的絮凝物用作吸附剂用于CI酸性红1染料水溶液的脱色。为了确定不同吸附剂的脱色效率，在最佳pH值下进行了动力学和平衡研究。在 pH 4 时，使用 Fe ₂ (SO ₄ ) ₃可获得 87%的出色脱色效果；在 pH 10 下，使用硫酸锰可实现 65% 的良好脱色效果；在 pH 10 下，使用氯化锰可获得 58% 的中等脱色效果，最佳吸附剂剂量为 500 mg L ^-1，平衡接触时间为 15 分钟。平衡研究的吸附数据与朗缪尔等温线吻合良好，表明在染料脱色的吸附过程中发生了单层形成。硫酸铁和硫酸锰的最大吸附容量分别为47.619和23.474 mg g ^-1。动力学研究的数据与伪二阶方程非常吻合，表明化学吸附是限速步骤。