Adsorption potential of the struvite (recovered from the high-strength ammonium-rich synthetic wastewater) was explored for the first time for the removal of an anthraquinone dye (Remazol Brilliant Blue R, RBBR) from aqueous phases. According to the experimental findings obtained from the RBBR-struvite adsorption system, the maximum dye removal efficiency (≈ 79%) was achieved at pH of 2.0, adsorbent dose of 40 g/L, initial dye concentration of 80 mg/L, contact time of 60 min, and temperature of 60 °C. Adsorption isotherms showed that both Langmuir and Freundlich isotherm models fitted very well to the experimental data (R2 > 0.990), and adsorption kinetics were satisfactorily described by the Ho and McKay’s PSO kinetic model (R2 ≈ 0.990). Based on the Langmuir isotherm model, the maximum adsorption capacity of the struvite for the RBBR dye was determined as 21.73 mg/g. The sample exhibited a mesoporous structure and had a BET surface area of 16.35 m2/g. Thermodynamic parameters (ΔG°, ΔH°, and ΔS°) confirmed that the adsorption of the RBBR dye onto the struvite was spontaneous and endothermic in nature and reflected the enhanced degree of disorderliness at the solid/liquid interface, respectively. A MIMO (multiple inputs and single output) Mamdani-type fuzzy inference system was developed for the first time in modeling of the RBBR-struvite adsorption system. The proposed fuzzy logic model showed a superior prediction performance (R2 ≈ 0.980) when compared to the conventional multiple regression methodology. Overall experimental and statistical results confirmed that struvite could be used as a promising adsorbent material for anthraquinone dye removal from aqueous solutions.

中文翻译：

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通过鸟粪石去除蒽醌染料：平衡、动力学、热力学、模糊逻辑建模

首次探索了鸟粪石（从高强度富含铵的合成废水中回收）的吸附潜力，用于从水相中去除蒽醌染料（Remazol Brilliant Blue R，RBBR）。根据从 RBBR-鸟粪石吸附系统获得的实验结果，在 pH 为 2.0、吸附剂剂量为 40 g/L、初始染料浓度为 80 mg/L、接触时间时达到最大染料去除效率（≈ 79%） 60 分钟，温度为 60 °C。吸附等温线表明，Langmuir 和 Freundlich 等温线模型与实验数据非常吻合（R2 > 0.990），Ho 和 McKay 的 PSO 动力学模型（R2 ≈ 0.990）令人满意地描述了吸附动力学。基于朗缪尔等温线模型，鸟粪石对 RBBR 染料的最大吸附容量确定为 21.73 mg/g。该样品表现出介孔结构，BET 表面积为 16.35 m2/g。热力学参数（ΔG°、ΔH° 和 ΔS°）证实 RBBR 染料在鸟粪石上的吸附本质上是自发和吸热的，分别反映了固/液界面无序度的增强。首次在RBBR-鸟粪石吸附系统的建模中开发了MIMO（多输入单输出）Mamdani型模糊推理系统。与传统的多元回归方法相比，所提出的模糊逻辑模型显示出优越的预测性能（R2 ≈ 0.980）。