Dispersion-promoted synergistic cationic dye removal through the co-introduction of natural diatomite and bentonite into chitosan-based hydrogel beads

IF 8.6 2区 工程技术 Q1 ENERGY & FUELS Sustainable Materials and Technologies Pub Date : 2024-11-01 DOI:10.1016/j.susmat.2024.e01166
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Abstract

Hydrogel beads have drawn considerable attention in sustainable wastewater treatment because of their low cost, modifiability, and feasibility. Accordingly, chitosan-based hybrid hydrogel beads were fabricated by incorporating naturally available siliceous micro- and nanoparticles, namely diatomite and bentonite, with different mass ratios. Morphology, swelling behavior, mechanical stability, and ultimately, Methylene Blue (MB)-adsorption performance of the hydrogel beads were comprehensively evaluated in terms of filler dispersion and interactions between the fillers and the matrix. Results revealed that while the simultaneous incorporation of inorganic additives inside the chitosan backbone reduced the swelling degree, the mechanical stability was significantly ameliorated when the 1:1 diatomite-bentonite mass ratio was exploited inside the chitosan matrix. That can be attributed to the well-dispersed fillers and enhanced mechanical entanglements, as well as the strengthened physical interactions between diatomite-bentonite and chitosan matrix. When the hybrid filling system was applied, MB removal efficiency increased synergistically by over 246 % compared to bentonite alone and 268 % compared to diatomite alone, even at low MB concentration (10 ppm). The MB adsorption kinetics and isotherm were also studied. The adsorption kinetics of MB were well-fitted for all compositions using the pseudo-second-order model. The isotherm data for optimum beads indicate that the Freundlich isotherm model provided the best fit, suggesting the multilayer adsorption with a non-uniform distribution of adsorption heat. The cost appraisal and recyclability/reusability assessment indicate that the combination of diatomite and bentonite in chitosan-based hydrogel beads offers a sustainable, highly efficient, and cost-effective solution for cationic dye removal applications.

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通过将天然硅藻土和膨润土共同引入壳聚糖水凝胶珠,以分散促进阳离子染料的协同去除
水凝胶珠因其低成本、可改性和可行性而在可持续废水处理方面备受关注。因此,我们在壳聚糖基混合水凝胶珠中加入了天然硅藻土和膨润土等不同质量比的硅微颗粒和纳米颗粒。根据填料的分散性以及填料与基质之间的相互作用,对水凝胶珠的形态、溶胀行为、机械稳定性以及最终的亚甲基蓝(MB)吸附性能进行了全面评估。结果表明,在壳聚糖骨架中同时加入无机添加剂会降低溶胀度,但在壳聚糖基质中采用 1:1 的硅藻土-膨润土质量比时,机械稳定性会明显改善。这归因于填料的良好分散和机械缠结的增强,以及硅藻土-膨润土和壳聚糖基质之间物理相互作用的加强。应用混合填充系统时,即使甲基溴浓度较低(10 ppm),甲基溴去除效率也比单独使用膨润土时协同提高了 246%以上,比单独使用硅藻土时提高了 268%。还研究了甲基溴的吸附动力学和等温线。使用伪二阶模型对所有成分的甲基溴吸附动力学进行了很好的拟合。最佳珠子的等温线数据表明,Freundlich 等温线模型的拟合效果最好,表明多层吸附的吸附热分布不均匀。成本评估和可回收性/可再利用性评估表明,壳聚糖水凝胶珠中硅藻土和膨润土的组合为阳离子染料去除应用提供了一种可持续、高效和经济的解决方案。
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来源期刊
Sustainable Materials and Technologies
Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment
CiteScore
13.40
自引率
4.20%
发文量
158
审稿时长
45 days
期刊介绍: Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.
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