This study describes the selective removal of cobalt (II) and nickel (II) from hydrometallurgical effluent using modified clinoptilolite. X‐ray fluorescence (XRF), x‐ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis were used to characterize the natural and modified clinoptilolites with dialkylphosphinic acid. In a batch experiment, the influence of different variables such as initial concentration, pH, particle size, clinoptilolites dosage, temperature, and contact time was evaluated. Higher removal efficiency was obtained at initial concentration of 600 mg/L, pH 6, particles size of 1000‐1400 μm, dosage of 10 g/100 mL, a temperature of 25°C, and contact time of 300 minutes. The experimental data fit satisfactorily to the pseudo‐second order kinetic and to the Langmuir isotherm model. Thermodynamic parameters like Gibb's free energy (ΔG^o), enthalpy (ΔH^o), and entropy (ΔS^o) were also evaluated. The results revealed that modified clinoptilolite with dialkylphosphinic acid could be successfully employed for the selective removal of cobalt (II) and nickel (II) from hydrometallurgical effluent.

中文翻译：

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用二烷基次膦酸修饰斜发沸石，以选择性地从湿法冶金废水中去除钴（II）和镍（II）

这项研究描述了使用改性斜发沸石从湿法冶金废水中选择性去除钴（II）和镍（II）的方法。使用X射线荧光（XRF），X射线衍射（XRD），扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）分析来表征具有二烷基次膦酸的天然和改性斜发沸石。在批处理实验中，评估了不同变量的影响，例如初始浓度，pH，粒度，斜发沸石的用量，温度和接触时间。初始浓度为600 mg / L，pH 6，粒径为1000-1400μm，剂量为10 g / 100 mL，温度为25°C，接触时间为300分钟时，去除效率更高。实验数据令人满意地适合伪二级动力学和Langmuir等温线模型。热力学参数，如吉布的自由能（ΔG^ø），焓（ΔH ^Ò）和熵（ΔS ^ö）也进行了评价。结果表明，用二烷基次膦酸改性的斜发沸石可以成功地用于从湿法冶金废水中选择性去除钴（II）和镍（II）。