We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
The mechanism for adsorption of Cr(VI) ions by PE microplastics in ternary system of natural water environment
Summary
Researchers investigated how polyethylene microplastics adsorb hexavalent chromium (Cr(VI)) from water in the presence of the surfactant sodium dodecyl benzene sulfonate (SDBS), finding that SDBS enhanced Cr(VI) adsorption at pH below 6 but competed with chromate ions for adsorption sites at pH above 6. Increasing PE microplastic dosage raised Cr(VI) adsorption capacity substantially, providing mechanistic insight into pollutant co-transport on microplastics in natural water systems.
More attention was paid to the attachment between microplastics and environmental pollutants. The adsorption performance of Polyethylene (PE) beads (a typical type of microplastics) and Cr(VI) ions with the existence of sodium dodecyl benzene sulfonate (SDBS) was investigated in this paper. The adsorption experiments of Cr(VI) ions by PE microplastics were conducted at different conditions, i.e. PE doses, pH and SDBS concentrations, respectively. The adsorption capability of Cr(VI) ions was increased from 0.39 to 1.36 mg⋅g when the dosage of PE microplastics was increased from 2 to 14 g ⋅L at pH of 5 with addition of SDBS, compared with increasing adsorption capability from 0.03 to 0.32 mg⋅g without addition of SDBS. The pH would influence the adsorption capability with and without the addition of SDBS. When the pH was less than 6, the adsorption capability of Cr(VI) would be promoted by the addition of SDBS; however, there was a contrast tendency when the pH was more than 6, which was attributed to that SDBS would compete with CrO for occupying the adsorption sites of PE microplastic. The SDBS concentration would affect the adsorption performance of Cr(VI) ions onto PE microplastics. The peak of the adsorption capacity was at SDBS concentration between 1 and 1.5 mM. This research would provide a basis for investigating the influence of SDBS on adsorption performance of heavy metal by PE microplastics to simulate the surface attachment model of those three kinds of pollutants.