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

IF 2.2 4区 化学 Q2 Engineering
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.

Graphical abstract

Abstract Image

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 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.
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