Comparison of Acid Red 114 Dye Adsorption by Fe₃O₄and Fe₃O₄Impregnated Rice Husk Ash

Abstract

The removal of Acid Red 114 (AR114) dye by adsorption process, using the magnetic nanoparticle (RHA-MNP) which is produced from rice husk ash burned at 300 ∘ C and the magnetic nanoparticle (MNP, Fe 3 O 4 ), was studied. Batch processes were used under different test parameters: pH (2, 4, 6, and 10) and without pH, initial dye concentration (20,40, 60, 80, and 100 mg/L), and contact time (0, 1, 5, 10, 15, 30, 45, 60, 90, and 150 min). Optimum conditions for AR114 removal were found to be at natural pH (pH without correction) for both adsorbents. Freundlich isotherm was found to be more consistent for MNP and Langmuir isotherm was found to be more consistent for RHA-MNP. The maximum adsorption capacities of MNP and RHA-MNP adsorbents for AR114 dye were equal to 111 mg/g. The kinetic experimental data fitted the pseudo-second-order model for both MNP and RHA-MNP. It can be concluded that RHA-MNP which is a waste could be used as low-cost adsorbent to remove AR114 from aqueous solution.

Magnetic rice husk ash 'cleanser' as efficient methylene blue adsorbent

“…The pH pzc of MRHA is determined to be 3.8. As the pH increase MRHA surface become more negatively charged, so the adsorption of MB cationic molecules increases when pH > pH pzc [27]. However, at pH < 7, q e plateaued which means no further significant change in the electrostatic interactions between the MB molecules and the MRHA brought by saturation of adsorption sites at the given conditions [49].…”

“…RHA was functionalized with Fe 3 O 4 as described in an earlier study with minor modification [27]. Briefly, 2:1 molar proportion of FeCl 3 •6H 2 O and FeSO 4 •7H 2 O respectively were stirred in distilled water (40 mL) for 1 h. NH 3 •H 2 O (10 mL) was added drop by drop to the solution and kept at 60°C for 2 h in an oven.…”

Adsorption of acid red 114 and reactive black 5 in aqueous solutions on dendrimer‐conjugated magnetic nanoparticles

“…[59] The calculated isotherm parameters of two anionic dyes from both models are shown in Table 2. [60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79] Though Fe 3 O 4 @SiO 2 -TRIS has a large number of terminal hydroxyl groups, their maximum dye binding capacity is less than that of Fe 3 O 4 @SiO 2 -MPAP [41] and Fe 3 O 4 @SiO 2 -NH 2. It indicates that the adsorption occurs at specific homogeneous sites within the adsorbent, forming a monolayer coating of the dye at the surface of the adsorbent.…”

“…To the best of our knowledge, this data compares reasonably well with the reported literature data related to the adsorption of AR-114 and RB-5. [60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79] Though Fe 3 O 4 @SiO 2 -TRIS has a large number of terminal hydroxyl groups, their maximum dye binding capacity is less than that of Fe 3 O 4 @SiO 2 -MPAP [41] and Fe 3 O 4 @SiO 2 -NH 2. [68,69] It can be because one dye molecule reacted very likely with several terminal hydroxyl groups on the particle surface and the active sites of the adsorbent were overloaded.…”

“…A comparison between the performance of Fe 3 O 4 @SiO 2 -TRIS with those of other adsorbents based on the removal of AR-114 and RB-5 dyes obtained the previous studies is presented in Table 4. [41,[60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79] It is clearly seen that several efficient adsorbents already exist, and the absorption capacity of Fe 3 O 4 @SiO 2 -TRIS NPs is comparable to or even better than those of the natural inorganic adsorbents and adsorbents based on agricultural byproducts. However, the adsorption capacity of Fe 3 O 4 @SiO 2 -TRIS NPs is lower than that of Fe 3 O 4 @SiO 2 -MPAP NPs and Fe 3 O 4 @SiO 2 -NH 2 NPs, which can be due to the lower binding capacity of Fe 3 O 4 @-SiO 2 -TRIS NPs during surface modification.…”