Multi-site nanocomposite sorbent for simultaneous removal of diverse micropollutants from treated wastewater

Self-regenerable clay polymer nanocomposite for organophosphate adsorption and degradation

“…52–56 We designed CPNs with an extended polymer configuration (dangling into solution) that were beneficial for the removal of micropollutants from water in the presence of DOM, suggesting unique binding sites for small micropollutants, which were overlooked by the bulk DOM. 3,57,58 Impressively, the DOM was also efficiently removed by this CPN, indicating that various binding sites coexist on the CPN.…”

“…DOM removal by the CPN was very high, ∼85% even at high concentrations, and was attributed to the electrostatic interactions of the DOM with the positive functional groups (pyridinium) of the polymer and also to pi-pi interactions. 3,57,62,68 The negative functional group (oxime) of the polymer is accountable for the organophosphate degradation. Despite the close proximity between the positive and negative groups of the polymer and possible steric hindrance by adsorbed DOM molecules, the efficiency of organophosphate degradation remained high.…”

“…The removal of emerging micropollutants, such as industrial compounds, personal care products, steroids, hormones, and pharmaceuticals, from water has been extensively addressed in the last decade. [1][2][3][4][5][6] The real challenge in treating micropollutants is their coexistence with high concentrations of dissolved organic matter (DOM), three to six orders of magnitude higher depending on the source of water. DOM, mainly composed of high molecular weight, aromatic, and negatively charged molecules, 7 is commonly removed during water treatment since it imparts undesired color, taste, and odor 8,9 and forms complexes with pollutants.…”

DOM removal from surface water by activated carbonvs.a nanocomposite: an experimental and modeling approach to optimize treatment

“…50 We have previously shown that CPNs made with polycations are very effective at removing negatively charged DOM compounds. 51,52 Here, we studied a granulated CPN based on montmorillonite (MMT) and polydiallyldimethylammonium chloride (PD), a cationic polymer commonly used as a flocculant in water treatment. 53 We previously reported that PD-MMT preferentially removes large, negatively charged DOM compounds that have high SUVA 254 , 54 and, as a result, PD-MMT was more effective than GAC at removing DOM from Suwannee River (SUVA 254 = 3.2) than from Lake Kinneret (Sea of Galilee, Israel) (SUVA 254 = 0.9), and vice versa.…”