Sustainable removal of anodized aluminum dye by groundwater treatment waste: experimental and modeling

Abstract

Groundwater treatment waste (GWTW), as an environmentally friendly renewable nanomaterial, was implemented for the removal of anodized aluminum dye Sanodure Green (SG) from aqueous solutions. The capability of the SG metal complex dye removal was assessed by measuring solution decoloration and chromium elimination degree. GWTW was characterized using FTIR, SEM, EDX, TEM, XPS and surface area measurements. Kinetic curves were obtained by changing initial dye concentration, pH, temperature and adsorbent dose. Kinetic studies showed that up to 90 % of SG dye was removed within a contact time of 20 min. The adsorption of the dye was favourable at 293 K temperature in the acidic pH region (pH 1.5–2.0) with maximum adsorption capacity 185 mg g −1 . Langmuir-Freundlich isotherm model as well as hyperbolic tangent, diffusion-chemisorption and Elovich kinetic models accurately describe the dye removal process. The calculated thermodynamic parameters confirmed that SG dye removal occurred spontaneously and exothermically. The magnitude of enthalpy change (ΔH ° = −35.80 kJ mol −1 ) was in agreement with the electrostatic interaction. The adsorption potential of GWTW for SG dye removal was also evaluated using a real wastewater produced after dyeing of anodized aluminum.

Economical and eco‐friendly adsorbent derived from “Halodule uninervis” for effective removal of N‐nitrosodiphenylamine from wastewater: Equilibrium, reusability, and mechanism studies

“…At the same time, it has been found that the rate of adsorption ( k 2 ) decreases with the increasing concentration of adsorbate NDPhA which might be attributed to a repulsion between the molecules in the bulk as well as at the adsorbent surface. Similarly, R 2 values obtained from the Elovich model are also high which indicates the mechanism of the heterogeneous diffusion process 57 …”

“…Freundlich n 1.56 Similarly, R 2 values obtained from the Elovich model are also high which indicates the mechanism of the heterogeneous diffusion process. 57 For further investigation, the diffusion mechanism of the NDPhA molecules was examined, and the resistance of mass transfer on the binding of NDPhA on the surface of SG was investigated by fitting the equilibrium adsorption data with the most widely used intraparticle diffusion model described by Weber and Morris. 52 In general, in a well-designed adsorption experiment, the adsorption process occurs in three consecutive stages; (i) diffusion of particle through the boundary layer, which is also known as film diffusion, (ii) intra-particle diffusion of adsorbate through the interior pores of the adsorbent, and (iii) adsorption of adsorbate molecules onto the active sites on the interior surface of the adsorbent.…”

Combined Action of Adsorption and Catalytic Oxidation in Aluminum Dye Removal by Groundwater Treatment Waste

“…The adsorption capacity and catalytic activity are strongly related to the specific surface area of iron-oxide minerals (Garrido-Ramírez et al, 2010). The BET-specific surface area of raw GWTW dried at room temperature and used in this work for the SG dye adsorption and destruction was 34.76 m 2 g -1 (Sodaitienė et al, 2021).…”

Column adsorption of biological oxygen demand, chemical oxygen demand and total organic carbon from wastewater by magnetite nanoparticles-zeolite A composite

“…Owing to the increasing demand for environmental protection, several conventional treatment methods have been reported by researchers to effectively remove pollutants from wastewater. For instance, ion exchange [ 10 ], reverse osmosis [ 11 ], nanofiltration [ 12 ], biological technique [ 13 ], coagulation/flocculation [ 14 ], reverse osmosis [ 15 ], chemical precipitation [ 16 ], photocatalysis [ 17 , 18 ], membrane processes [ 19 ], advanced oxidation processes [ 8 ] and adsorption process [ 20 ]. However, some of the highlighted methods have their limitations that are either require frequent maintenance, high cost of operation, longer degradation time, generation of sludge in large amounts and the use of expensive chemicals [ 21 , 22 ].…”