Chitosan-integrated TiO2 nanocomposite for adsorptive removal of Cd and Pb from drinking water

IF 2.2 4区化学 Q2 Engineering

Chemical Papers Pub Date : 2024-08-10 DOI:10.1007/s11696-024-03637-6

Suraya Samejo, Jameel Ahmed Baig, Tasneem Gul Kazi, Hassan Imran Afridi, H. Elhosiny Ali, Saima Perveen, Khalil Akhtar, Shakoor Ahmed Solangi, Fahad Abbasi, Sajjad Hussain

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Abstract

This work described a plant extract-based synthesis of titanium oxide nanoparticles (D-TiO₂–NPs) using Duranta erecta leave extract, followed by the fabrication of its nanocomposite (D-TiO₂–NC) with chitosan for adsorptive removal of toxic metals (TMs) cadmium (Cd) and lead (Pb) from water. D-TiO₂–NPs and D-TiO₂–NC were characterized by various analytical techniques. This study confirmed the porous and rough crystalline nanostructure with different functional groups of chitosan and D-TiO₂–NPs of synthesized D-TiO₂–NC for feasible excellent adsorptive removal of Cd and Pb. The maximum removal of Cd and Pb was achieved at pH (6), initial concentration of metal ions (30 mg L⁻¹), the content of D-TiO₂–NC (50 mg), contact time (30 min), and temperature (45 °C) with adsorption capacities of 147 and 145.5 mg g⁻¹, respectively. The D-TiO₂–NC has successfully followed the pseudo-second-order kinetics for the successful removal of Cd and Pb. However, the resulting data followed multilayer adsorption for the removal of Cd while monolayer adsorption for Pb onto the D-TiO₂–NC. The findings of the thermodynamic study revealed that the D-TiO₂–NC followed the endothermic and spontaneous adsorption process for the adsorption of Cd and Pb. Furthermore, D-TiO₂–NC can easily be used several times after washing with diluted HNO₃ for the adsorptive removal of Cd and Pb. Moreover, it is quantitatively adsorbed (> 90%) the Cd and Pb from the collected drinking water samples.

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壳聚糖集成 TiO2 纳米复合材料用于吸附去除饮用水中的镉和铅

这项工作描述了一种基于植物提取物的氧化钛纳米颗粒（D-TiO2-NPs）的合成方法，该方法使用直立杜兰叶提取物，然后将其与壳聚糖制成纳米复合材料（D-TiO2-NC），用于吸附去除水中的有毒金属（TMs）镉（Cd）和铅（Pb）。通过各种分析技术对 D-TiO2-NPs 和 D-TiO2-NC 进行了表征。该研究证实，壳聚糖和 D-TiO2-NPs 合成的 D-TiO2-NC 具有不同官能团的多孔粗糙结晶纳米结构，对镉和铅具有极佳的吸附去除效果。在 pH 值（6）、金属离子初始浓度（30 mg L-1）、D-TiO2-NC 含量（50 mg）、接触时间（30 分钟）和温度（45 °C）条件下，镉和铅的去除率最大，吸附容量分别为 147 mg g-1 和 145.5 mg g-1。D-TiO2-NC 在成功去除镉和铅的过程中成功地遵循了伪秒阶动力学。然而，D-TiO2-NC 去除镉的结果数据遵循的是多层吸附，而去除铅的结果数据遵循的是单层吸附。热力学研究结果表明，D-TiO2-NC 在吸附镉和铅时遵循内热和自发吸附过程。此外，D-TiO2-NC 用稀释的 HNO3 洗涤后可多次使用，很容易吸附去除镉和铅。此外，它还能定量（90%）吸附所采集的饮用水样品中的镉和铅。

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来源期刊

Chemical Papers Chemical Engineering-General Chemical Engineering

CiteScore

3.30

自引率

4.50%

发文量

590

期刊介绍： Chemical Papers is a peer-reviewed, international journal devoted to basic and applied chemical research. It has a broad scope covering the chemical sciences, but favors interdisciplinary research and studies that bring chemistry together with other disciplines.