Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Abstract

The rice husk ash (RHA) extracted from the rice husk (RH) was measured on the removal of the Remazol Red dye. Adsorption variables such as solution pH, dye concentration, adsorbent amount, contact time, and reuse of the RHA were measured. The adsorption equilibrium was achieving in approximately 30 min, due to the rapid electrostatic attraction between the OH 2 + groups of the RHA surface and the sulfonic groups of the dye, which occurred mainly at a pH = 2 value. The removal efficiency of the RHA decreased when the initial dye concentrations were higher, due to pore-filling within of the RHA structure with the migration dye molecules. However, the removal percentage increased with increasing adsorbent amount. The adsorption data were suitable with the Freundlich isotherm and pseudo-second order models.

Preparation and utilization of Keggin-type polyoxometalate intercalated Ni–Fe layered double hydroxides for enhanced adsorptive removal of cationic dye

“…It was estimated that around 100 tons of dyes were discharged into the water body annually due to the lack of dyeing process efficiency [1]. Since it has a detrimental effect to the living organism, numerous attempts have been developed to remove dyes from industrial wastewater [2]. Among the established methods, adsorption is still considered as the most feasible and affordable methods for treating the dye contaminated wastewater.…”

Polycyclic Aromatic Hydrocarbons Removal from Aqueous Solution with PABA-MCM-41/Polyethersulfone Mixed Matrix Membranes

“…The characterizations of the RH and RHA materials are reported previously [42,47]. The PABA-MCM-41 (RHA) modi ed mesoporous array exhibited a hexagonal arrangement with surface area value of the magnitude of 438 m 2 g − 1 , the N 2 adsorption/desorption analysis also revealed a type IV isotherm with H1 hysteresis.…”

Activated Carbon/Bentonite/Fe3O4 as Novel Nanobiocomposite for High Removal of Cr(VI) Ions

“…As the Cr(VI) ion concentration increases, the pores on the nanocomposite surface get saturated and the uptake efficiency therefore decreases. In other words, the pores on the composite surface can absorb a limited number of ions 37. Therefore, the optimal value of the Cr(VI) ion concentration was found to be 5 mg L −1 .…”