Efficient adsorption of bulky reactive dyes from water using sustainably-derived mesoporous carbons.

Autor: Abdoul HJ; Green Chemistry Centre of Excellence, University of York, York, North Yorkshire, YO10 5DD, UK; Charmo University, College of Medicals and Applied Sciences, Pharmaceutical Chemistry Department, Kurdistan Region, Iraq., Yi M; Departamento de Física de Polímeros, Elastómeros y Aplicaciones Energéticas, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, C/ Juan de La Cierva 3, 28006, Madrid, Spain., Prieto M; Departamento de Física de Polímeros, Elastómeros y Aplicaciones Energéticas, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, C/ Juan de La Cierva 3, 28006, Madrid, Spain., Yue H; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China., Ellis GJ; Departamento de Física de Polímeros, Elastómeros y Aplicaciones Energéticas, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, C/ Juan de La Cierva 3, 28006, Madrid, Spain., Clark JH; Green Chemistry Centre of Excellence, University of York, York, North Yorkshire, YO10 5DD, UK., Budarin VL; Green Chemistry Centre of Excellence, University of York, York, North Yorkshire, YO10 5DD, UK; Departamento de Física de Polímeros, Elastómeros y Aplicaciones Energéticas, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, C/ Juan de La Cierva 3, 28006, Madrid, Spain. Electronic address: vitaliy@ictp.csic.es., Shuttleworth PS; Departamento de Física de Polímeros, Elastómeros y Aplicaciones Energéticas, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, C/ Juan de La Cierva 3, 28006, Madrid, Spain. Electronic address: peter@ictp.csic.es.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2023 Mar 15; Vol. 221, pp. 115254. Date of Electronic Publication: 2023 Jan 09.
DOI: 10.1016/j.envres.2023.115254
Abstrakt: Hazardous reactive dyes can cause serious environmental problems, as they are difficult to remove from water using conventional adsorbents due to their large molecular sizes and bulky structures. Sustainable mesoporous carbons derived from alginic acid demonstrated promising adsorbent capacity for several representative industrial bulky reactive dye molecules that account for almost 30% of the global textile dye market: Procion Yellow H-XEL (PY), Remazol Black (RB), Procion Crimson H-XEL (PC) and Procion Navy H-XEL (PN). These new adsorbents showed high mesoporosity (>90%) and large pore diameters (>20 nm) facilitating more straightforward and efficient adsorption and desorption processes when compared with predominately microporous activated carbon (AC), Norit, of similar surface chemistry, or with Silica gel (Sgel) that shows good mesoporosity but is hydrophilic. Their adsorption capacity was also significantly higher than that of both AC and Sgel, verifying suitability for bulky dye elimination from wastewater. Adsorption kinetic studies showed a best fit with the Elovich model, indicating a heterogeneous surface adsorption process. The adsorption isotherm data was best represented via the Toth model for almost all adsorbent/dye systems (R 2  ≥ 0.98), validating the results of the Elovich model whereby the adsorbent is structurally heterogenous with multilayer dye coverage. From thermodynamic analysis, the derived parameters of ΔG (-11.6 ∼ -6.2 kJ/mol), ΔH and ΔS demonstrate a spontaneous, enthalpy controlled adsorption process that was exothermic for RB (-10.0 kJ/mol) and PC (-23.9 kJ/mol) and endothermic for PY (3.9 kJ/mol) and PN (13.2 kJ/mol). Overall these alginic acid based mesoporous carbons are cost-effective, sustainable and efficient alternatives to current predominantly microporous adsorbent systems.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: