Abstract
In this paper, attapulgite purified by acid heat was employed, and millimeter polyethersulfone-modified attapulgite hybrid microspheres were prepared. The effects of mixed bisphenol A (BPA) and sulfamethoxazole (SMX) solution on the modified attapulgite doping ratio, initial solution pH, adsorbent dosage, contaminant concentration, and temperature were studied. The experimental results showed that BPA and SMX compete in the adsorption process, and the hybrid microspheres preferentially select the BPA molecules (anionic endocrine disruptors) compared to the SMX. The adsorption process in the mixed solution conforms to the quasi-secondary-order kinetic model. The adsorption of BPA and SMX by hybrid microspheres is more consistent with the extended Langmuir adsorption thermodynamic model, and the adsorption of BPA + SMX is more in line with the Langmuir adsorption thermodynamic model. At 25 °C, the maximum adsorption capacity of hybrid microspheres for BPA and SMX was 102.04 and 12.80 μmol·g−1, respectively, and the maximum adsorption of BPA + SMX was 112.36 μmol·g−1. After five regenerations, the removal effect of the hybrid microspheres on the endocrine disruptors remained above 95%.
Highlights
Endocrine-disrupting compounds (EDCs) are a class of hazardous substances that affect specific levels of endocrine systems
Lu et al found that the attapulgite iron-oxide magnetic composite prepared by coprecipitation has good adsorption efficiency for heavy metal cerium(III) in water, and the composite material can be recovered by magnetic separation method [13]
The PES material and the modified attapulgite were selected to make hybrid microspheres to adsorb the mixed solution of two endocrine disruptors (BPA and SMX)
Summary
Endocrine-disrupting compounds (EDCs) are a class of hazardous substances that affect specific levels of endocrine (hormone) systems. EDCs are usually organic pollutants or heavy metal substances. Some drinking water sources and tap water were detected as containing EDCs. The southern region is dominated by organic chemical raw materials such as polychlorinated biphenyls, BPA, and PAE. The adsorption method is mainly used for the removal of organic pollutants [8] and heavy metal contaminants [9]. Lu et al found that the attapulgite iron-oxide magnetic composite prepared by coprecipitation has good adsorption efficiency for heavy metal cerium(III) in water, and the composite material can be recovered by magnetic separation method [13]. The PES material and the modified attapulgite were selected to make hybrid microspheres to adsorb the mixed solution of two endocrine disruptors (BPA and SMX). The adsorption principle of hybrid microspheres on endocrine disruptors in anion and cation forms in aqueous solution is of great significance for the further exploration of such hybrid microspheres and their application in water treatment
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