Abstract
Bisphenol A (BPA) is a typical endocrine-disrupting chemical. The removal of BPA has raised much concerns in recent years. This paper examined the adsorption behavior of BPA to biochars and the different effects of cationic, anionic, and nonionic surfactants. The results indicated that peanut shell biochars prepared at 300°C (BC300), 500°C (BC500), and 700°C (BC700) showed strong adsorption affinity for BPA, and the adsorption affinity of biochars increased with the increase of pyrolysis temperature. The range of log Kd values was 2.83∼3.71, 2.91∼4.57, and 3.24∼5.50 for BC300, BC500, and BC700, respectively. Both the type of surfactants and the properties of biochars could affect the adsorption behavior of BPA. Cetyltrimethyl ammonium bromide (CTAB) showed negligible effect on the adsorption of BPA on BC300, and the inhibition effect of CTAB was stronger with the increase of biochar pyrolysis temperature. Tween 20 and sodium dodecyl benzene sulfonate (SDBS) showed stronger inhibition effect than CTAB, especially on BC300. This is likely because the inhibition effect caused by competition of CTAB may be counterbalanced by the enhancement caused by the partitioning effect by adsorbed CTAB and the bridge effect between the –NH4+ group of CTAB and the phenol group on BPA/O-functional groups of biochars, whereas Tween 20 and SDBS do not have this bridge effect advantage. This study could provide insightful information for the application of biochars in removal of BPA.
Highlights
Bisphenol A (BPA) is one of the most common endocrinedisrupting chemicals, which is widely applied to produce plastics, resins, and other materials [1]
Kim et al [13] reported that the adsorptive capacity of BPA to biochars is even stronger than that to powdered activated carbon. e adsorption behavior of biochars could be affected by aqueous chemistry conditions once they were applied in wastewater treatment [14, 15]
There are few studies focused on the effects of different types of surfactants on the adsorption of BPA on biochars. us, it is of great importance to explore the effects of surfactants on the adsorption behavior of BPA to biochars and compare the differences between the different types of surfactants
Summary
Bisphenol A (BPA) is one of the most common endocrinedisrupting chemicals, which is widely applied to produce plastics, resins, and other materials [1]. Zhang et al [20] reported that high concentration of cationic surfactant, cetyltrimethyl ammonium bromide (CTAB), could enhance the adsorption of phenanthrene on black carbon, whereas high concentration of anionic surfactant, sodium dodecyl benzene sulfonate (SDBS), inhibited the adsorption of phenanthrene. There are few studies focused on the effects of different types of surfactants on the adsorption of BPA on biochars. Us, it is of great importance to explore the effects of surfactants on the adsorption behavior of BPA to biochars and compare the differences between the different types of surfactants. The adsorption behavior of BPA to peanut shell biochars was examined, and the effects of different types of surfactants were evaluated. Physicochemical properties of peanut shell biochars under different pyrolysis temperatures were characterized. e adsorption affinities of BPA to the peanut shell biochars in absence and presence of the surfactants were examined by batch experiment. e controlling mechanisms were discussed
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