A highly effective synthetic clinoptilolite (SCP) was developed and assessed for its potential in the simultaneous removal of Cd²⁺, Ni²⁺, Mn²⁺, Sr²⁺, and Fe³⁺ from an aqueous solution. The present work explored the influences of SCP dosage, initial metal ion concentrations, temperature, contact time, and pH value on the adsorption performances of these metal ions. The results revealed exceptionally high adsorption capacities, reaching 2000, 1720, 1875, 1510, and 22 mg/g for Ni²⁺, Fe³⁺, Cd²⁺, Mn²⁺, and Sr²⁺, respectively. The specific surface area of SCP increased from 31.4 to 44.7 m²/g after five cycles. The adsorption mechanism and structure assessment were elucidated by XRD patterns and SEM images, showing that the Fe³⁺ adsorption conformed to the Langmuir isotherm, while that of Mn²⁺, Cd²⁺, Sr²⁺, and Ni²⁺ followed the Freundlich isotherm model with the adsorption kinetics best described by the pseudo-2nd-order kinetic model. Thermodynamic parameters showed endothermic behavior for Cd²⁺, Ni²⁺, Mn²⁺, and Sr²⁺, exothermic for Fe³⁺, and spontaneity for all metals except Sr²⁺. SCP retained over 90 % of its adsorption capacity after five regeneration cycles, maintaining structural integrity under thermal, acidic, and recycling conditions. These findings highlight SCP’s robust characteristics, reusability, and potential for sustainable heavy metal removal from wastewater.

中文翻译：

---

使用合成斜发沸石通过单一处理方法从废水中高效去除 Fe3+、Mn2+、Ni2+、Cd2+ 和 Sr2+ 的界面吸附


开发了一种高效的合成斜发沸石 （SCP） 并评估了其从水溶液中同时去除 Cd²⁺、Ni²⁺、Mn²⁺、Sr²⁺ 和 Fe³⁺ 的潜力。本研究探讨了 SCP 用量、初始金属离子浓度、温度、接触时间和 pH 值对这些金属离子吸附性能的影响。结果表明，Ni²⁺、Fe³⁺、Cd²⁺、Mn²⁺ 和 Sr²⁺ 的吸附容量分别达到 2000、1720、1875、1510 和 22 mg/g。5 次循环后，SCP 的比表面积从 31.4 m 2/g 增加到 44.7 m²/g。通过 XRD 图谱和 SEM 图像阐明了吸附机理和结构评估，表明 Fe³⁺ 的吸附符合 Langmuir 等温线，而 Mn²⁺、Cd²⁺、Sr²⁺ 和 Ni²⁺ 的吸附遵循 Freundlich 等温线模型，吸附动力学最好由准 2 级动力学模型描述。热力学参数显示 Cd²⁺、Ni²⁺、Mn²⁺ 和 Sr²⁺ 的吸热行为，Fe³⁺ 的放热行为，以及除 Sr²⁺ 以外的所有金属的自发性。SCP 在五次再生循环后保留了超过 90% 的吸附能力，在热、酸和回收条件下保持结构完整性。这些发现突出了 SCP 的稳健特性、可重用性以及从废水中可持续去除重金属的潜力。