Hydroxyapatite-Modified Zeolite for Fluoride Removal from Drinking Water: Adsorption Mechanism Investigation and Column Study

IF 1.4 4区环境科学与生态学 Q4 WATER RESOURCES

Water SA Pub Date : 2025-03-20 DOI:10.3390/w17060908

Rajinda Boteju, Libing Zheng, Hewa M. S. Wasana, Qiyang Wu, Yuansong Wei, Hui Zhong, Yawei Wang, Ajith de Alwis

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引用次数: 2

Abstract

This study investigates the synthesis and application of hydroxyapatite (HAp)-modified zeolite materials for efficient fluoride removal from groundwater-based drinking water. Characterization confirmed the successful incorporation of HAp onto the zeolite surface and the formation of a stable composite. EDS analysis revealed the presence of Ca and P after modification, while FTIR and XRD confirmed the structural integrity of HAp during adsorption. ZH8 exhibited the highest F-removal efficiency of 92.23% at pH 3, 30 °C, [F−] = 6 ppm and dose = 10 g/L. Meanwhile, HAp-modified zeolite showed high F-selectivity, and the competing ions had limited interference. The Langmuir model best described the adsorption process, suggesting monolayer adsorption with a maximum capacity of 39.38 mg/g for ZH8. The process followed pseudo-first-order kinetics, with equilibrium achieved within 4 h. Regeneration studies demonstrated that ZH8 maintained over 85% efficiency for three cycles, highlighting its reusability. Column studies validated the material’s practical applicability, with breakthrough times of up to 23 h under optimal conditions (flow rate: 8 cm3 min−1, bed depth: 30 cm, feed concentration: 7.5 ppm) and a maximum yield of 99% at [F−] = 5 ppm with Vb = 10.8 L. The Thomas model best described the column adsorption process, indicating chemical adsorption as the dominant mechanism. These findings demonstrate the potential of HAp-modified zeolite, particularly ZH8, as an effective adsorbent for fluoride removal in real-world applications.

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羟基磷灰石改性沸石对饮用水除氟的吸附机理及柱状研究

研究了羟基磷灰石（HAp）改性沸石材料的合成及其在地下水饮用水中高效除氟的应用。表征证实了HAp在沸石表面的成功结合，并形成了稳定的复合材料。EDS分析表明改性后的HAp存在Ca和P， FTIR和XRD证实了吸附过程中HAp的结构完整性。在pH = 3,30°C, [F−]= 6 ppm，剂量= 10 g/L的条件下，ZH8的去除率最高，为92.23%。同时，hap修饰的沸石具有较高的f选择性，竞争离子干扰有限。Langmuir模型最能描述吸附过程，表明ZH8的最大吸附容量为39.38 mg/g。该过程遵循准一级动力学，在4小时内达到平衡。再生研究表明，ZH8在三个循环中保持了85%以上的效率，突出了其可重复使用性。色谱柱研究验证了该材料的实用性，在最佳条件下（流量：8 cm3 min - 1，床深：30 cm，进料浓度：7.5 ppm），突破时间长达23 h，在[F−]= 5 ppm, Vb = 10.8 l时，收率最高可达99%。Thomas模型最好地描述了色谱柱吸附过程，表明化学吸附是主要机理。这些发现证明了hap改性沸石，特别是ZH8，在实际应用中作为一种有效的除氟吸附剂的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water SA 环境科学-水资源

CiteScore

2.80

自引率

6.70%

发文量

审稿时长

18-36 weeks

期刊介绍： WaterSA publishes refereed, original work in all branches of water science, technology and engineering. This includes water resources development; the hydrological cycle; surface hydrology; geohydrology and hydrometeorology; limnology; salinisation; treatment and management of municipal and industrial water and wastewater; treatment and disposal of sewage sludge; environmental pollution control; water quality and treatment; aquaculture in terms of its impact on the water resource; agricultural water science; etc. Water SA is the WRC’s accredited scientific journal which contains original research articles and review articles on all aspects of water science, technology, engineering and policy. Water SA has been in publication since 1975 and includes articles from both local and international authors. The journal is issued quarterly (4 editions per year).