In-situ sampling of chlorophenols in industrial wastewater using diffusive gradients in thin films technique based on mesoporous carbon. (October 2019)

• Record Type: Journal Article
• Authors: Meng, Zhuo; You, Nan; Fan, Hong-Tao
• Is Part Of: Chemosphere. Volume 232(2019)
• Page Start: 18
• Page End: 25
• Publication Date: 2019-10
• Subjects: Diffusive gradients in thin films -- Chlorophenols -- Mesoporous carbon -- In-situ -- Sampling; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.05.163
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In-situ sampling of 2-chlorophenol (CP), 2, 4-dichlorophenol (DCP), and 2, 4, 6-trichlorophenol (TCP) in industrial wastewater was carried out by the diffusive gradients in thin films (DGT) device based on mesoporous carbon (MC). The diffusion coefficients of CP ((1.33 ± 0.05) × 10 −6 cm 2 s −1 ), DCP((1.35 ± 0.04) × 10 −6 cm 2 s −1 ) and TCP((1.09 ± 0.07) × 10 −6 cm 2 s −1 )) in nylon membrane at 25 °C were independent of pH 3–9 and ionic strength as pNaCl from 0.155 to 3, and were less than their values in water, demonstrating that the nylon membrane with good tolerance and constant diffusion coefficients was suitable as the DGT diffusion layer for controlling the diffusion of CPs. MC-DGT accurately measured the concentrations of CP, DCP and TCP in synthetic solution ( C DGT / C SOLN = 0.956–1.04) over the deployment of 120 h. The experimental data also agreed well with the theoretical data calculated on the DGT equation. The performance of MC-DGT for sampling CPs was independent of pH (3–8) and ionic strength as pNaCl (1.3–3) due to the change of the interaction between MC and CPs under relatively high pH and ionic strength. Deployments in laboratory and field trials demonstrated that the MC-DGT was a reliable simple, robust and accurate tool for the in-situ sampling of CP, DCP and TCP in the industrial wastewater. Graphical abstract: Image 1 Highlights: In-situ simultaneous sampling of chlorophenols by DGT based on mesoporous carbon. Mesoporous carbon from SBA-15 mesoporous silica as template and sucrose as carbon source. No influence on DGT uptakes for analytes in pH (3–8) and ionic strength (0.001–0.05 mol L −1 ) ranges. Positive results proved validity of proposed DGT for in-situ sampling in lab and field trials.