Treatment of fluoride-contaminated water using hydrous Mn and Zr oxide doped hybrid anion exchange resin (HAIX/Mn-Zr)

IF 5.8 Q2 ENGINEERING, ENVIRONMENTAL

Groundwater for Sustainable Development Pub Date : 2025-11-01 Epub Date: 2025-10-13 DOI:10.1016/j.gsd.2025.101534

Jay Sharma, Vikrant Ranyal, Sudipta Sarkar

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Abstract

Fluoride contamination of groundwater is a persistent problem in the Indian Peninsula and also in many parts of the world. Zirconium oxide-impregnated polymers have demonstrated promising fluoride removal capacity; however, their restricted operating range of pH and interference from co-existing anions invariably limit the feasibility of field application. To obviate the problem, a strong-base polymeric anion exchanger (INDION 830S) was modified with the impregnation of dual metal (Zr and Mn) hydroxide nanoparticles. The synthesized resin (HAIX/Mn-Zr) demonstrated preferential fluoride capture in the presence of competing anions in the pH range of 4.5–5, with the point of zero charge measured at pH around 5.1 and a good removal efficiency of 80.7 % up to pH 6.0. Adsorption of fluoride by HAIX/Mn-Zr followed the Freundlich isotherm model and the pseudo-second-order kinetics. The maximum fluoride adsorption capacity was 28.1, 29.7, and 31.5 mg/g at 20, 30, and 40 °C temperatures, respectively. The adsorption process was endothermic, exhibiting an activation energy of 12.61 kJ/mol, a negative Gibbs free energy, and a positive enthalpy change. Fourier-transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) analysis indicated chemisorption of fluoride onto HAIX/Mn-Zr, while X-ray diffraction (XRD) confirmed its amorphous structure. Scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDS) revealed a visible morphology change after the loading of Mn (2.2 wt%) and Zr (21.8 wt%). The column study demonstrated that around 2000 bed volumes of contaminated water were treated before the breakthrough of 1.5 mg/L of fluoride. Overall, the HAIX/Mn-Zr is a low-cost sorbent with a facile synthesis and regeneration procedure, reusability up to five cycles, and high fluoride removal efficiency, indicating its high potential for the defluoridation of contaminated groundwater.

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含水Mn、Zr氧化物掺杂杂化阴离子交换树脂（HAIX/Mn-Zr）处理含氟污水

地下水的氟化物污染是印度半岛和世界许多地区的一个长期问题。氧化锆浸渍聚合物具有良好的除氟能力；然而，它们有限的工作pH范围和共存阴离子的干扰总是限制了现场应用的可行性。为了解决这一问题，采用双金属（Zr和Mn）氢氧化物纳米颗粒浸渍改性了一种强碱聚合物阴离子交换剂（INDION 830S）。合成的树脂（HAIX/Mn-Zr）在pH为4.5 ~ 5的竞争阴离子存在下表现出优先的氟捕获，在pH为5.1左右时测得零电荷点，在pH为6.0时具有良好的去除效率，达到80.7%。HAIX/Mn-Zr对氟的吸附符合Freundlich等温模型和准二级动力学。在20°C、30°C和40°C温度下，氟的最大吸附量分别为28.1、29.7和31.5 mg/g。吸附过程为吸热吸附，活化能为12.61 kJ/mol，吉布斯自由能为负，焓变为正。傅里叶变换红外（FT-IR）和x射线光电子能谱（XPS）分析表明氟化物在HAIX/Mn-Zr上有化学吸附，x射线衍射（XRD）证实了其无定形结构。扫描电子显微镜和能量色散x射线能谱（SEM/EDS）显示，Mn （2.2 wt%）和Zr （21.8 wt%）加载后，材料的形貌发生了明显的变化。柱式研究表明，在氟化物突破1.5 mg/L之前，处理了约2000床体积的污染水。总体而言，HAIX/Mn-Zr是一种低成本的吸附剂，其合成和再生程序简单，可重复使用多达五个循环，除氟效率高，表明其在受污染地下水除氟方面具有很大的潜力。

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来源期刊

Groundwater for Sustainable Development Social Sciences-Geography, Planning and Development

CiteScore

11.50

自引率

10.20%

发文量

152

期刊介绍： Groundwater for Sustainable Development is directed to different stakeholders and professionals, including government and non-governmental organizations, international funding agencies, universities, public water institutions, public health and other public/private sector professionals, and other relevant institutions. It is aimed at professionals, academics and students in the fields of disciplines such as: groundwater and its connection to surface hydrology and environment, soil sciences, engineering, ecology, microbiology, atmospheric sciences, analytical chemistry, hydro-engineering, water technology, environmental ethics, economics, public health, policy, as well as social sciences, legal disciplines, or any other area connected with water issues. The objectives of this journal are to facilitate: • The improvement of effective and sustainable management of water resources across the globe. • The improvement of human access to groundwater resources in adequate quantity and good quality. • The meeting of the increasing demand for drinking and irrigation water needed for food security to contribute to a social and economically sound human development. • The creation of a global inter- and multidisciplinary platform and forum to improve our understanding of groundwater resources and to advocate their effective and sustainable management and protection against contamination. • Interdisciplinary information exchange and to stimulate scientific research in the fields of groundwater related sciences and social and health sciences required to achieve the United Nations Millennium Development Goals for sustainable development.