Wang Puyan, Duan Runbin, Li Yuzhen, Yan Meifang, Han Huiying, Sun Yao
Department of Environmental Engineering, College of Environment and Ecology, Taiyuan University of Technology, Taiyuan, Shanxi Province, China.
Water Environ Res. 2025 Jun;97(6):e70102. doi: 10.1002/wer.70102.
To address global fluoride pollution and mitigate its impact on human health and ecosystems, while also tackling the waste disposal issue, this study used batch experiments to explore thermal and phosphoric acid modification of oyster shells (OS) for enhancing fluoride removal. OS calcined at 900°C (OS900) and OS modified with HPO at a Ca/P molar ratio of 1.5 (OSP15) are the best OS-based adsorbents, corresponding to the respective modification methods. OS900 and OSP15 maintained high fluoride removal at different pH levels. The Freundlich model and the pseudo-second-order model better described the isotherm data and the kinetic data, respectively. OSP15 outperformed OS900 in terms of q, resistance to interference from co-anions, and reusability. Moreover, both OS900 and OSP15 effectively removed fluoride from real-world groundwater and coal mining water, meeting the WHO standards. They demonstrated significant potential for fluoride removal, providing an environmentally sustainable solution for managing oyster shell waste. SUMMARY: Thermal calcination (900°C) and phosphoric acid treatment (Ca/P = 1.5) enhance oyster shells' fluoride adsorption, turning seafood waste into eco-friendly adsorbents. OS900 and OSP15 maintain stable fluoride removal across pH variations and improve efficiency at higher temperatures, suited for diverse water treatment scenarios. OSP15 outperforms OS900 in capacity, reusability, and resistance to competing anions, offering an environmentally sustainable solution for groundwater and coal mining wastewater treatment. Both adsorbents meet WHO fluoride standards in real-world applications, addressing dual challenges of fluorosis prevention and sustainable shellfish waste recycling. Further research is needed to optimize performance in complex industrial effluents and innovate scalable OS-based materials for broader environmental remediation.
为解决全球氟污染问题，减轻其对人类健康和生态系统的影响，同时解决废物处理问题，本研究采用批量实验探索牡蛎壳（OS）的热改性和磷酸改性以增强氟去除效果。在各自的改性方法中，900°C煅烧的牡蛎壳（OS900）和以1.5的钙/磷摩尔比用磷酸改性的牡蛎壳（OSP15）是最佳的基于牡蛎壳的吸附剂。OS900和OSP15在不同pH水平下均保持高氟去除率。Freundlich模型和准二级模型分别能更好地描述等温线数据和动力学数据。OSP15在q、抗共存阴离子干扰能力和可重复使用性方面优于OS900。此外，OS900和OSP15均能有效去除实际地下水中和煤矿开采水中的氟，符合世界卫生组织标准。它们在氟去除方面显示出巨大潜力，为管理牡蛎壳废物提供了环境可持续的解决方案。总结：热煅烧（900°C）和磷酸处理（钙/磷 = 1.5）增强了牡蛎壳对氟的吸附，将海鲜废物转化为环保吸附剂。OS900和OSP15在不同pH值变化下保持稳定的氟去除率，并在较高温度下提高效率，适用于各种水处理场景。OSP15在容量、可重复使用性和抗竞争阴离子能力方面优于OS900，为地下水和煤矿开采废水处理提供了环境可持续的解决方案。两种吸附剂在实际应用中均符合世界卫生组织的氟标准，解决了预防氟中毒和可持续贝类废物回收利用的双重挑战。需要进一步研究以优化在复杂工业废水中的性能，并创新基于牡蛎壳的可扩展材料以进行更广泛的环境修复。
