Biowaste-derived chitosan composites for adsorptive removal of Pb(II) from water

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2025-05-13 DOI:10.1016/j.matchemphys.2025.131019

Aveen M. Hanna, Rounak M. Shariff

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Abstract

This study investigates the dynamic removal of lead(II) ions using biosorbents derived from peach shells and raw eggshells, forming composite chitosan adsorbents. Biosorbents were produced from peach shell (PS), carbonized peach shell (PSC), and acidified carbonized peach shell (APSC), then impregnated onto chitosan to form composites (PSCh, PSCCh, and APSCCh). Adsorption kinetics and thermodynamics were studied at temperatures of 25, 35, and 45 ± 1 °C. FTIR, XRD, SEM, and EDX analyses revealed morphological changes after bioadsorption. Four isotherm and kinetic models evaluated the adsorption efficiency. The pseudo-second-order kinetic model showed the best fit, with R² values up to 0.999. Langmuir isotherm analysis indicated single-layer adsorption, with maximum capacities reaching 50 mg/g. Thermodynamic parameters confirmed the process as spontaneous, endothermic, and chemisorption-driven, with ΔG⁰ values ranging from −24.02 to −28.21 kJ/mol and activation energies (Ea) of 8.91–24.51 kJ/mol. Changes in enthalpy (ΔH⁰: 6.43–22.03 kJ/mol) and entropy (ΔS⁰: 0.109–0.156 kJ/mol.K) indicated increased surface randomness. Overall, the study highlights the efficiency of chitosan-impregnated peach shell biosorbents for lead removal, offering a promising, eco-friendly solution for water treatment applications.

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生物废弃物衍生壳聚糖复合材料对水中铅（II）的吸附去除

以桃壳和生蛋壳为原料制备生物吸附剂，形成复合壳聚糖吸附剂，对铅（II）离子的动态去除进行了研究。以桃壳（PS）、碳化桃壳（PSC）和酸化碳化桃壳（APSC）为原料制备生物吸附剂，并将其浸渍在壳聚糖上形成复合材料（PSCh、PSCCh和APSCCh）。在25、35和45±1℃条件下研究了吸附动力学和热力学。FTIR， XRD， SEM和EDX分析显示生物吸附后的形态变化。四个等温线和动力学模型评估了吸附效率。拟二级动力学模型拟合效果最好，R2值可达0.999。Langmuir等温线分析为单层吸附，最大吸附量可达50 mg/g。热力学参数证实了该过程为自发、吸热和化学吸附驱动的过程，其ΔG0值为−24.02 ~−28.21 kJ/mol，活化能（Ea）为8.91 ~ 24.51 kJ/mol。焓（ΔH0: 6.43 ~ 22.03 kJ/mol）和熵（ΔS0: 0.109 ~ 0.156 kJ/mol. k）的变化表明表面随机性增加。总的来说，该研究强调了壳聚糖浸渍桃壳生物吸附剂去除铅的效率，为水处理应用提供了一个有前途的、环保的解决方案。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.