Adsorption of microcystin-LR on mesoporous carbons and its potential use in drinking water source. (June 2017)

• Record Type: Journal Article
• Authors: Park, Jeong-Ann; Jung, Sung-Mok; Yi, In-Geol; Choi, Jae-Woo; Kim, Song-Bae; Lee, Sang-Hyup
• Is Part Of: Chemosphere. Volume 177(2017)
• Page Start: 15
• Page End: 23
• Publication Date: 2017-06
• Subjects: Mesoporous carbon -- Adsorption -- Microcystin-LR -- Pore diffusion -- Water quality parameter -- Drinking water source; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2017.02.150
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Microcystin-LR (MC-LR) is a common toxin derived from cyanobacterial blooms an effective, rapid and non-toxic method needs to be developed for its removal from drinking water treatment plants (DWTP). For an adsorption-based method, mesoporous carbon can be a promising supplemental adsorbent. The effect of mesoporous carbon (MC1, MC2, and MC3) properties and water quality parameters on the adsorption of MC-LR were investigated and the results were analyzed by kinetic, isotherm, thermodynamic, Derjaguin–Landau–Verwey–Overbeek (DLVO), and intraparticle diffusion models. MC1 was the most appropriate type for the removal of MC-LR with a maximum adsorption capacity of 35, 670.49 μg/g. Adsorption of MC-LR is a spontaneous reaction dominated by van der Waals interactions. Pore sizes of 8.5–14 nm enhance the pore diffusion of MC-LR from the surface to the mesopores of MC1. The adsorption capacity was not sensitive to changes in the pH (3.2–8.0) and the existence of organic matter (2–5 mg/L). Furthermore, the final concentration of MC-LR was below the WHO guideline level after a 10-min reaction with 20 mg/L of MC1 in the Nak-Dong River, a drinking water source. The MC-LR adsorption mainly competed with humic substances (500–1000 g/mole); however, they did not have a great effect on adsorption. Highlights: Mesoporous carbon adsorb MC-LR efficiently and rapidly. MC-LR adsorption is spontaneous reaction dominantly by van der Waals interaction. Pore size of 8.5–14 nm enhanced the pore diffusion of MC-LR. Adsorption was not affected by pH changes and the existence of organic matter. Mesoporous carbon remove MC-LR in drinking water source to levels below 1 μg/L.