Efficient removal of acid dye from aqueous solutions via adsorption using low-cost blast-furnace slag

Abstract

2016): Efficient removal of acid dye from aqueous solutions via adsorption using low-cost blast-furnace slag, Desalination and Water Treatment, A B S T R A C TAcid Red 138 (AR138) and Acid Green 27 (AG27) were efficiently removed from aqueous solutions via adsorption using modified blast-furnace slag (MBFS). The surface of MBFS was investigated using scanning electron microscopy and Brunauer-Emmett-Teller method. The effects of operating parameters such as adsorbent dosage, pH, and temperature on the dye removal were studied. The pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were used to describe the kinetics data. The equilibrium isotherms were analyzed using the Langmuir and Freundlich adsorption models. The experimental data fitted well to the pseudo-second-order kinetics model for AR138 and AG27. The Freundlich isotherm described the equilibrium data of acid dyes on MBFS better than the Langmuir isotherm. Furthermore, the thermodynamic parameters (ΔG 0 < 0, ΔH 0 < 0, and ΔS 0 < 0) showed that the adsorption reactions of AR138 and AG27 onto MBFS were feasible, spontaneous, and exothermic under the investigated conditions. Thus, MBFS is an effective biosorbent for the removal of acid dyes.

Chitosan–Clay Composites for Wastewater Treatment: A State-of-the-Art Review

“…Different types of adsorbents (organic, inorganic, hybrid, or biological materials) have demonstrated satisfactory results for the decontamination of wastewater. Among these adsorbents, activated carbons, , zeolites (activated and natural), natural clay minerals, modified clay minerals, ,,− clay–polymer composites, ,− silica nanoparticles or beads, ceramics, agricultural waste, − biochar, − biomass, , surfactant-modified biomass, industrial waste and sludge materials, ,, and polymeric resins are a few significant examples of high-performance adsorbents.…”