4 research outputs found
Benchmarking Micropollutant Removal by Activated Carbon and Porous β‑Cyclodextrin Polymers under Environmentally Relevant Scenarios
The
cost-effective and energy-efficient removal of organic micropollutants
(MPs) from water and wastewater is challenging. The objective of this
research was to evaluate the performance of porous β-cyclodextrin
polymers (P-CDP) as adsorbents of MPs in aquatic matrixes. Adsorption
kinetics and MP removal were measured in batch and flow-through experiments
for a mixture of 83 MPs at environmentally relevant concentrations
(1 μg L<sup>–1</sup>) and across gradients of pH, ionic
strength, and natural organic matter (NOM) concentrations. Performance
was benchmarked against a coconut-shell activated carbon (CCAC). Data
reveal pseudo-second-order rate constants for most MPs ranging between
1.5 and 40 g mg<sup>–1</sup> min<sup>–1</sup> for CCAC
and 30 and 40000 g mg<sup>–1</sup> min<sup>–1</sup> for
P-CDP. The extent of MP removal demonstrates slower but more uniform
uptake on CCAC and faster but more selective uptake on P-CDP. Increasing
ionic strength and the presence of NOM had a negative effect on the
adsorption of MPs to CCAC but had almost no effect on adsorption of
MPs to P-CDP. P-CDP performed particularly well for positively charged
MPs and neutral or negatively charged MPs with McGowan volumes greater
than 1.7 (cm<sup>3</sup> mol<sup>–1</sup>)/100. These data
highlight advantages of P-CDP adsorbents relevant to MP removal during
water and wastewater treatment