Performance evaluation and mechanism of Al2O3/TiO2 sorbents for fluoride remediation in groundwater

IF 4.9 Q2 ENGINEERING, ENVIRONMENTAL Groundwater for Sustainable Development Pub Date : 2024-06-29 DOI:10.1016/j.gsd.2024.101259
Gabriel T. Colledge, John G. Outram, Graeme J. Millar
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Abstract

Excessive fluoride levels in drinking water are problematic in several countries, particularly those which are relatively poor. Thus, there is a need to create cost effective sorbents which can easily be applied to make the water safe to use. Therefore, this study focussed on Al2O3/TiO2 sorbents which appear to address issues with commercially available alumina such as aluminium dissolution. Adjusting the alumina/titania ratio significantly influenced not only the fluoride uptake capacity but also the uptake of a wide range of contaminants found in groundwater. The exchange kinetics were relatively fast regardless of mixed oxide composition with equilibrium obtained within 6 h. Equilibrium isotherms were unfavourable for fluoride removal where titania compositions were dominant. In contrast, favourable isotherms were noted when alumina was the dominant oxide present. Barium, calcium, strontium, boron, iron, manganese, zinc, potassium, lithium, and silica were all substantially removed by varying the alumina/silica ratio in the sorbent. This behaviour may be valuable for broader remediation of dissolved species in groundwater (not just fluoride). Based upon the tests data a 70% Al2O3 – 30% TiO2 material was recommended to be the preferred composition for comprehensive treatment of groundwater. The sorbents appeared to comprise of alumina and titania with surface areas between 129 and 255 m2/g. There was no evidence for new oxide phases nor for a relationship between surface area and performance. Mechanistically both ion exchange and surface complexation may occur when treating groundwater.

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用于地下水氟化物修复的 Al2O3/TiO2 吸附剂的性能评估和机理研究
在一些国家,尤其是相对贫穷的国家,饮用水中氟含量过高是个问题。因此,有必要开发出成本效益高、易于应用的吸附剂,以确保水的安全使用。因此,本研究重点关注 Al2O3/TiO2 吸附剂,它似乎可以解决市售氧化铝的问题,如铝溶解问题。调整氧化铝/二氧化钛的比例不仅会显著影响氟的吸收能力,还会影响对地下水中多种污染物的吸收。在二氧化钛成分占主导地位的情况下,平衡等温线不利于氟的去除。相反,当氧化铝是主要的氧化物时,平衡等温线是有利的。通过改变吸附剂中氧化铝/二氧化硅的比例,钡、钙、锶、硼、铁、锰、锌、钾、锂和二氧化硅都被大量去除。这种特性对于更广泛地修复地下水中的溶解物种(不仅仅是氟化物)可能很有价值。根据测试数据,建议采用 70%Al2O3 - 30% TiO2 材料作为综合处理地下水的首选成分。吸附剂似乎由氧化铝和二氧化钛组成,表面积在 129 至 255 平方米/克之间。没有证据表明存在新的氧化物相,也没有证据表明表面积与性能之间存在关系。从机理上讲,处理地下水时可能会发生离子交换和表面络合。
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来源期刊
Groundwater for Sustainable Development
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.
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