Adsorption equilibrium and mechanisms of tris(2-chloroethyl)phosphate (TCEP) on zeolite-β under environmentally relevant and competitive conditions with methyl tert-butyl ether (MTBE)

Add time:08/19/2019    Source:sciencedirect.com

Tris-2-chloroethyl phosphate (TCEP), an emerging contaminant of concern, is largely recalcitrant to removal due to its relatively high water solubility and non-degradability. Adsorption from wastewater is an option for separation, with a suitable adsorbent. In this study, equilibrium adsorption of TCEP onto zeolite–β (300:1 Si: Al ratio) is reported for simulated environmental waters with commonly occurring competing adsorbates. The equilibrium adsorption capacity of the adsorbent to TCEP in pure water which is about 103 mg/g is reduced by approximately 30% in the presence of natural organic material (NOM) and several common salts. The data show that increasing NOM and salt concentrations do not have a proportionately increased effect. The equilibrium adsorption capacity of TCEP was reduced, by up to 70% under competitive conditions with methyl t-butyl ether (MTBE), another common contaminant in industrial wastewaters. Solid state NMR analyses of the zeolite subsequent to TCEP adsorption provide insight to the preferred zeolite adsorption sites. The NMR data for both Si and C appear to indicate that a hydrophobic surface interaction between the organic carbon and zeolite silica surfaces is the most likely adsorption mechanism.

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