Abstract Synergistic effects of ion exchange and complexation in Cd(II) removal was studied by the modification of nanoparticles of clinoptilolite zeolite (NCP) by pentetic acid (diethylenetriaminepentaacetic acid: DTPA) as a family of EDTA. XRD, FT-IR, BET, TG-DTG, and SEM-EDX were used for the characterization of the NCP and NCP-DTPA. The interactions of solution pH, NCP-DTPA dosage, concentration of cadmium solution and contact time were studied by Response Surface Methodology (RSM). The pH- adsorbent dosage and pH-CCd interactions had the most important roles in the Cd(II) removal. Both Langmuir and Freundlich isotherms can model the removal results. The qm and KL were about 138.9 (mg g−1) and 0.0007 (L mg−1) for the Langmuir isotherm. The values of 1.8 and 1.06 were obtained for n and KF as Freundlich constants, respectively. The results can be well modeled by the pseudo-second-order kinetics model (r2 = 0.9986) for describing the kinetics of the process. The best run included the adsorbent dose: 0.2 g L−1, pH: 5.9, CCd: 985 mg L−1 and 205 min contacting time.

中文翻译：

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一种新型喷替酸-斜发沸石纳米颗粒吸附剂从水溶液中去除 Cd(II) 的综合研究：实验设计、动力学和热力学方面

摘要 通过使用 EDTA 家族的喷替酸（二亚乙基三胺五乙酸：DTPA）修饰斜发沸石沸石 (NCP) 的纳米颗粒，研究了离子交换和络合在 Cd(II) 去除中的协同效应。XRD、FT-IR、BET、TG-DTG 和 SEM-EDX 用于表征 NCP 和 NCP-DTPA。通过响应面法(RSM)研究了溶液pH值、NCP-DTPA用量、镉溶液浓度和接触时间之间的相互作用。pH-吸附剂剂量和pH-CCd相互作用在Cd(II)去除中具有最重要的作用。Langmuir 和 Freundlich 等温线都可以模拟去除结果。Langmuir 等温线的 qm 和 KL 约为 138.9 (mg g-1) 和 0.0007 (L mg-1)。n 和 KF 作为 Freundlich 常数分别获得 1.8 和 1.06 的值。结果可以通过伪二级动力学模型 (r2 = 0.9986) 很好地建模，以描述过程的动力学。最佳运行包括吸附剂剂量：0.2 g L-1，pH：5.9，CCd：985 mg L-1 和 205 分钟接触时间。