Abstract
Abstract This study focuses on the removal of three model compounds, classified as emerging persistent organic pollutants (Em-POPs), from water using a modified version of natural Australian zeolite. Following a series of subsequent treatments and vacuum deposition of graphene oxide (GO), both chemical and physical properties of the adsorbent were characterized. The GO-coated zeolite was tested for the removal of methylene blue (MB), disperse blue 26 (DB26), and sodium fluorescein (NaFn). Results show excellent removal capability for MB and DB26 dyes and decent removal for NaFn when compared to commercially available products such as granular activated carbon. Regeneration of the adsorbent showed virtually no loss in adsorptive performance after two cycles, with MB and DB26.
Highlights
Detection of many toxic and synthetically produced compounds in natural waters and other water supplies calls for improved methods for their removal due to their adverse health effects on humans and the ecosystem (Savage & Diallo 2005; WHO 2011)
The data obtained for disperse blue 26 (DB26) from the vacuum GO (VGO) zeolite and GAC columns show substantially higher removal than for clean zeolite, and a similar trend can be observed for NaFn
A cationic dye, showed a positive increase in zeta potential at a pH slightly above 4, while the opposite occurs for the VGO zeolite at relatively similar pH values
Summary
Detection of many toxic and synthetically produced compounds in natural waters and other water supplies calls for improved methods for their removal due to their adverse health effects on humans and the ecosystem (Savage & Diallo 2005; WHO 2011). Out of the many compounds of interest, emerging persistent organic pollutants (Em-POPs) have been receiving a great deal of attention in recent years. This issue is concerning for developing countries where locals consume and. The most important attribute shared by all POPs is that they are persistent and that they are organic. These compounds are typically halogenated, usually with chlorine, containing highly stable C-Cl bonds. PCBs for instance can remain in the environment for decades with minimal degradation
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