Insights in the adsorption of eco-friendly starch hydrogel

IF 3 4区工程技术 Q3 CHEMISTRY, PHYSICAL

Adsorption Pub Date : 2024-07-28 DOI:10.1007/s10450-024-00509-z

Paulo H. Fernandes Pereira, Andressa I. C. da Silva, Rennan F. S. Barbosa, Valdeir Arantes, Daniella R. Mulinari, Derval S. Rosa

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Abstract

This work prepared a class of starch hydrogel with and without lignin from sugarcane bagasse (5% wt.) and trisodium citrate as a crosslinking agent. The physical and chemical properties of the hydrogels were characterized by Fourier-transformed infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA), and X-ray diffractometry (XRD) techniques. Besides, the swelling degree and the pH of zero point charge (pH_zpc) were evaluated. Hydrogels were tested for the adsorption of potentially toxic elements (PTEs) and dye (methylene blue) by chromatography and UV-vis, respectively. FTIR confirmed that the reticulation of the starch structure successfully occurred, while the inclusion of lignin promoted new interactions that increased pore size, swelling degree, and pH_zpc of the developed hydrogels. The adsorption of cationic metals at pH < pHzpc showed low removal but presented complete adsorption of oxyanion chromium. Moreover, the adsorption of methylene blue presented removal higher than 90%, further enhanced by lignin presence, which presented an adsorption capacity of 99.4 mg.g⁻¹ at 70 min. The hydrogels presented a better fit to the Freundlich isotherm model, indicating that removal is favorable. Thus, using lignin in the hydrogels can enhance their performance and be an alternative to developing new eco-friendly materials.

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环保型淀粉水凝胶的吸附性研究进展

本研究以甘蔗渣（5% wt.）为原料，以柠檬酸三钠为交联剂，制备了一种含木质素和不含木质素的淀粉水凝胶。傅立叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、热重分析（TGA）和 X 射线衍射仪（XRD）技术对水凝胶的物理和化学特性进行了表征。此外，还评估了溶胀度和零点电荷的 pH 值（pHzpc）。色谱法和紫外可见光法分别检测了水凝胶对潜在有毒元素（PTEs）和染料（亚甲基蓝）的吸附情况。傅立叶变换红外光谱证实，淀粉结构成功地发生了网状化，而木质素的加入促进了新的相互作用，增加了所制备水凝胶的孔径、膨胀度和 pHzpc。在 pH < pHzpc 条件下，阳离子金属的吸附去除率较低，但对氧阴离子铬的吸附完全。此外，亚甲基蓝的吸附去除率高于 90%，木质素的存在进一步提高了去除率，70 分钟时的吸附容量为 99.4 mg.g-1。水凝胶与 Freundlich 等温线模型的拟合度更高，表明去除效果良好。因此，在水凝胶中使用木质素可以提高水凝胶的性能，也是开发新型环保材料的一种选择。

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来源期刊

Adsorption 工程技术-工程：化工

CiteScore

8.10

自引率

3.00%

发文量

审稿时长

2.4 months

期刊介绍： The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news. Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design. Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.