pone.0328646.t001 -

Industrial wastewater contaminated with organic dyes poses significant environmental and health risks. Developing effective and eco-friendly removal methods is crucial to mitigate the harmful impact of dye pollution. This study explores the green synthesis and application of strontium oxide (SrO) nanoparticles and chitosan-encapsulated strontium oxide (CS-SrO) nanocomposite as adsorbents for the removal of cationic and anionic dyes from aqueous solutions. Characterization revealed that the SrO nanoparticles exhibited a sharp localized surface plasmon resonance (LSPR) peak at 274 nm, while the CS-SrO nanocomposite depicted a broad LSPR peak between 230–280 nm. XRD analysis confirmed the face-centered cubic structure of the SrO nanoparticles, with an average crystallite size of 32 nm. Detailed dye removal studies revealed that the SrO nanoparticles achieved up to 80% removal of the cationic crystal violet dye, while the CS-SrO nanocomposite demonstrated 81% removal of the anionic methyl orange dye under optimized conditions. Further investigations into adsorption kinetics, isotherms, and thermodynamics provided insights into the mechanisms governing the dye removal processes. This work contributes to the advancement of green nanotechnology for environmental remediation purposes. These findings pave the way for the development of practical applications in water purification and pollution control strategies.

受有机染料污染的工业废水会带来严重的环境与健康风险。开发高效且环保的去除方法，对于缓解染料污染的有害影响至关重要。本研究探索了氧化锶（strontium oxide, SrO）纳米颗粒以及壳聚糖包覆氧化锶（chitosan-encapsulated strontium oxide, CS-SrO）纳米复合材料的绿色合成方法，并将其作为吸附剂，用于从水溶液中去除阳离子与阴离子染料。表征结果显示，SrO纳米颗粒在274 nm处呈现出尖锐的局域表面等离子体共振（localized surface plasmon resonance, LSPR）峰，而CS-SrO纳米复合材料则在230–280 nm区间内呈现出宽幅LSPR峰。X射线衍射（X-ray diffraction, XRD）分析证实，SrO纳米颗粒为面心立方结构，平均晶粒尺寸为32 nm。详细的染料去除实验结果表明，在优化条件下，SrO纳米颗粒对阳离子染料结晶紫的去除率可达80%，而CS-SrO纳米复合材料对阴离子染料甲基橙的去除率可达81%。针对吸附动力学、吸附等温线以及热力学的进一步研究，揭示了染料去除过程的核心作用机制。本研究为面向环境修复的绿色纳米技术发展提供了助力。上述研究成果为开发水处理净化与污染控制策略的实际应用铺平了道路。