Magnetic Carbon Nanotubes-Silica Binary Composite for Effective Pb(II) Sequestration from Industrial Effluents: Multivariate Process Optimization,Clean - Soil Air Water

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Magnetic Carbon Nanotubes-Silica Binary Composite for Effective Pb(II) Sequestration from Industrial Effluents: Multivariate Process Optimization
Clean - Soil Air Water ( IF 1.5 ) Pub Date : 2021-06-09 , DOI: 10.1002/clen.202000401
Aminul Islam ₁ , Anjali Chauhan ₁ , Hina Javed ₁ , Saman Rais ₁ , Izhar Ahmad ₁

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In this work, magnetic multiwalled carbon nanotubes-silica binary composite (mCNT@APS) is synthesized via amide bond and utilized for the Pb(II) adsorption from aqueous solutions in batch mode. The composite is characterized using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), X-ray diffraction (XRD), and point of zero charge (pH_pzc) studies. Three levels and three factorial Box–Behnken design in response surface methodology is employed to assess and optimize the effects of influential parameters: pH, initial concentration, and contact time. Using the desirability function, the obtained optimum conditions are pH 5.4, feed concentration 757 µg mL⁻¹ and contact time 4 min. The electrostatic attraction between the active binding sites of adsorbent and Pb(II) at pH_pzc < pH results in higher saturation capacity (79.69 mg g⁻¹) in accordance with the best fitted non-linearized Langmuir isotherm model. The pseudo-second-order model fits well to the kinetic data implying chemisorption of Pb(II) onto mCNT@APS. The material can be regenerated up to 15 sorption–desorption cycles using 5 mL of 1.5 M HNO₃. The adsorbent exhibits excellent Pb(II) removal efficiency (>98%) from industrial effluents and tap water samples.

中文翻译：

磁性碳纳米管-二氧化硅二元复合材料用于有效封存工业废水中的 Pb(II)：多变量工艺优化

在这项工作中，磁性多壁碳纳米管-二氧化硅二元复合材料（mCNT@APS）是通过酰胺键合成的，并用于以批处理方式从水溶液中吸附 Pb（II）。使用傅里叶变换红外光谱 (FT-IR)、热重分析 (TGA)、扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDS)、透射电子显微镜 (TEM)、X 射线衍射对复合材料进行表征(XRD) 和零电荷点 (pH _pzc ) 研究。采用响应面方法中的三个水平和三个因子 Box-Behnken 设计来评估和优化影响参数的影响：pH、初始浓度和接触时间。使用合意性函数，获得的最佳条件为 pH 5.4，进料浓度 757 µg mL^-1和接触时间 4 分钟。根据最佳拟合非线性朗缪尔等温线模型，在 pH _pzc < pH下吸附剂和 Pb(II) 的活性结合位点之间的静电吸引力导致更高的饱和容量（79.69 mg g ^-1）。伪二阶模型非常适合暗示 Pb(II) 化学吸附到 mCNT@APS 上的动力学数据。该材料可以使用 5 mL 1.5 M HNO ₃再生多达 15 个吸附-解吸循环。该吸附剂从工业废水和自来水样品中表现出出色的 Pb(II) 去除效率 (>98%)。

更新日期：2021-08-07

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