Enhancement the rhodamine 6G adsorption property on Fe₃O₄-composited biochar derived from rice husk

Abstract

Magnetic biochars were prepared using Fe 3 O 4 nanoparticle composites onto the surface of biochar derived from rice husk. The characteristics of magnetic biochar were characterized by scanning electron microscope, x-ray powder diffraction and Fourier-transform infrared techniques. The removal of rhodamine 6G dye by magnetic biochar, compared to pristine biochar was studied. The effects of pyrolysis temperature on rhodamine 6G adsorption was evaluated. Kinetic, isotherms and thermodynamic studies were carried out to investigate the adsorption mechanism of rhodamine 6G dye on magnetic biochar surface. The rhodamine 6G removal efficiency of Fe 3 O 4 -composited biochar (pyrolyzed at 500°C) is higher than that of pristine biochar with maximum efficiency of 94% removal. The adsorption isotherm and kinetic studies indicated that the langmuir model, pseudo-first order and pseudo-second order models described well the rhodamine adsorption onto magnetic Fe 3 O 4 -biochar. Abbreviations BCBiochar C 0 Initial dye concentration (mg/L) C e Equilibrium concentration of dye (mg/L) ΔG 0 The Gibbs free energy) and f ΔH 0 The change of enthalpy MB Magnetic biochar q e Adsorbed dye amount per gram of sorbent at equilibrium (mg/g) q e,cal Calculated amount of dye adsorbed per gram of adsorbent at equilibrium (mg/g) q e,exp Experimental amount of dye adsorbed per gram of adsorbent at equilibrium (mg/g) q t Adsorbed dye amount per gram of adsorbent at time t (mg/g) K Thermodynamic equilibrium constant K L Langmuir isotherm equilibrium constant representing the energy of sorption (L/mg) K F Freundlich constant representing sorption capacity ((mg/g)(L/mg)/n) k 1 Pseudo-first order rate constant (1/min) k 2 Pseudo-second order rate constant (g/mg·min) n Freundlich isotherm constant representing sorption intensity R The ideal gas constant (8.314 J mol −1 ·K −1 )

Novel Synthesis Strategy for the Use of Silica‐Based Composites Modified With Styrene‐Acrylic Copolymer as High‐Performance Adsorbents for Cationic Dyes Removal From Aqueous Environment

“…The authors have cited additional references within the Supporting Information. [63][64][65][66][67][68][69][70][71][72][73]…”

Adsorption of Rhodamine 6G Dye onto Al-MCM-41 and MCM-41 Mesoporous Materials

“…Besides, the negative ΔS° value indicated the increase in the molecular organisation and the decrease in randomness at the solid-solution interface during the adsorption process. 47,54…”

Investigations into the Antifungal, Photocatalytic, and Physicochemical Properties of Sol-Gel-Produced Tin Dioxide Nanoparticles

“…The discharge of rhodamine 6G into the aqueous medium is harmful for humans and longer term exposure results in multiple health issues such as vomiting, increase in heart rate, lung cancer, skin cancer and, in some cases, delay in physiological development. Therefore, it is highly necessary to degrade organic substances from waste water before they accumulate in the environment causing irreversible damage [ 8 ]. Photocatalysis involves the production of the hydroxyl radical and superoxide anion, which are generated by absorption of radiation by the catalyst.…”