Co-transport of chlordecone and sulfadiazine in the presence of functionalized multi-walled carbon nanotubes in soils. (February 2017)

• Record Type: Journal Article
• Authors: Zhang, Miaoyue; Engelhardt, Irina; Šimůnek, Jirka; Bradford, Scott A.; Kasel, Daniela; Berns, Anne E.; Vereecken, Harry; Klumpp, Erwin
• Is Part Of: Environmental pollution. Volume 221(2017)
• Page Start: 470
• Page End: 479
• Publication Date: 2017-02
• Subjects: Colloid-facilitated contaminant transport -- Multi-walled carbon nanotubes -- Soil -- Retention profile -- Numerical modeling; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2016.12.018
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Batch and saturated soil column experiments were conducted to investigate sorption and mobility of two 14 C-labeled contaminants, the hydrophobic chlordecone (CLD) and the sulfadiazine (SDZ), in the absence or presence of functionalized multi-walled carbon nanotubes (MWCNTs). The transport behaviors of CLD, SDZ, and MWCNTs were studied at environmentally relevant concentrations (0.1–10 mg L −1 ) and they were applied in the column studies at different times. The breakthrough curves and retention profiles were simulated using a numerical model that accounted for the advective-dispersive transport of all compounds, attachment/detachment of MWCNTs, equilibrium and kinetic sorption of contaminants, and co-transport of contaminants with MWCNTs. The experimental results indicated that the presence of mobile MWCNTs facilitated remobilization of previously deposited CLD and its co-transport into deeper soil layers, while retained MWCNTs enhanced SDZ deposition in the topsoil layers due to the increased adsorption capacity of the soil. The modeling results then demonstrated that the mobility of engineered nanoparticles (ENPs) in the environment and the high affinity and entrapment of contaminants to ENPs were the main reasons for ENP-facilitated contaminant transport. On the other hand, immobile MWCNTs had a less significant impact on the contaminant transport, even though they were still able to enhance the adsorption capacity of the soil. Graphical abstract: Highlights: A non-simultaneous transport of MWCNTs and contaminants in soil was investigated. Both breakthrough curves and retention profiles were determined and simulated. Mobile MWCNTs facilitated chlodecone transport in soil. Retained MWCNTs enhanced sulfadiazine retention in soil. Hydrus 1D and C-Ride module modeled transport and co-transport. Abstract : Experimental and simulated studies demonstrated that both mobile and retained MWCNTs had a significant impact on contaminant (chlordecone and sulfadiazine) transport in soil.