Authors:

Nistha Shrestha

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About Paper:

Arsenic, a naturally occurring element in the earth's crust, is widely distributed in the environment, including air, water, and soil. It exists in various oxidation states, with +5 (arsenate) and +3 (arsenite) being the most toxic and posing significant health risks. There are various techniques for arsenic removal from water including oxidation, precipitation, reverse osmosis, nanofiltration, and adsorption. Nanomaterials-based adsorption and filtration have gained substantial attention due to their excellent physical and chemical properties. Additionally, there is growing interest in developing sensors that exhibit selective visual changes upon interaction with arsenic. This study investigates nanomaterial-based arsenic adsorbents for selective colorimetric sensing. Specifically, Zeolitic Imidazolate Frameworks (ZIFs), a subclass of Metal-Organic Frameworks (MOFs) comprising cobalt centers coordinated with imidazolate linkers, are explored for their potential in sensing, adsorbing, and filtering arsenic from drinking water. ZIFs offer high surface area, thermal and chemical stability, adjustable pore structure, and water resistance, making them ideal for this application. The interaction of ZIFs with arsenic is analyzed through visual changes, FT-IR, and ICP-MS. Significant visual changes were observed upon reacting with arsenic, and the interactions were confirmed by FT-IR through peak shifting and broadening. ICP-MS will be employed to determine arsenic concentration, aiding in characterizing ZIFs and understanding adsorption kinetics. Further selectivity studies with common metals present in water are necessary to refine the catalyst. This research offers a comprehensive, efficient, and sustainable solution to arsenic contamination in drinking water, with potential for industrial-scale application. Keywords: Arsenic Removal; Adsorption; Membrane Filtration; Zeolitic Imidazolate Frameworks

Source:

Purdue University / 2024

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Co-authors:

Nistha Shrestha