Magnetic Fe₃O₄ Nanoparticle Biochar Derived from Pomelo Peel for Reactive Red 21 Adsorption from Aqueous Solution

Abstract

In this study, Fe3O4 nanoparticle-loaded biochar derived from the pomelo peel (FO-PPB) was synthesized and applied as an affordable material for the adsorption of Reactive Red 21 (RR21) in an aqueous solution. The characteristics of FO-PPB were evaluated by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), X-ray diffraction (XRD), Raman spectra, Fourier transform infrared spectra (FTIR), and Brunauer–Emmett–Teller (BET) surface area. The adsorption process of FO-PPB with RR21 was evaluated through batch experiments to examine various parameters including solution pH, contact time, adsorbent dose, initial RR21 concentration, and solution temperature. Results show that FO-PPB produced by the impregnation ratio between iron (Fe) and pomelo peel biochar (PPB) of 5 : 1 (w/w) had the best adsorption performance. The adsorption capacities of PPB and FO-PPB at optimum experimental conditions (solution pH 3, contact time of 60 min, solution temperature of 40°C, initial RR21 concentration of 300 mg/L, and adsorbent dose of 2 g/L) were 18.59 and 26.25 mg/g, respectively. The adsorption isotherms of RR21 on PPB and FO5-PPB were described well by Langmuir and Sips models with high R2 values of 0.9826 and 0.9854 for FO5-PPB and 0.9701 and 0.9903 for PPB, respectively. The obtained data also well matched the pseudo-first-order and pseudo-second-order models with R2 values ≥ 0.96. Chemisorption through sharing or electronic exchange was determined as the main adsorption mechanism.

Magnetic Hydrogel Composite for Wastewater Treatment

“…The higher amount of nitrogen adsorbed by the MNP–CNF/alginate gel bead compared to the CNF/alginate gel bead in the relative high-pressure region is likely due to the presence of Fe 3 O 4 in the matrix. Fe 3 O 4 increases the heterogeneity of the adsorbent, leading to higher porosity and, consequently, a better nitrogen absorbency [ 56 ]. The isotherms’ N 2 adsorption curve indicates step condensation behaviour which also could be due to the presence of microporous structures in the beads [ 57 ].…”

An Insight into a Sustainable Removal of Bisphenol A from Aqueous Solution by Novel Palm Kernel Shell Magnetically Induced Biochar: Synthesis, Characterization, Kinetic, and Thermodynamic Studies

“…Table 7 presents the comparison of specific surface area characteristics, adsorption capacity of BPA, and the magnetic intensity of the synthesized MBC material in the current study in comparison with various studies. tiple adsorption-desorption tests, was due to the partial desorption of BPA in MBC surface, competitive available sorption sites, loss of solid in solution, and the elution of iron oxide nanoparticles and energetic substances on MBC surface [49,132]. This reveals that the MBC could be an effectual, economical, and environmental benign adsorbent with superior re-usability, which can be practically applied in BPA removal procedures.…”

NGHIÊN CỨU XỬ LÝ CHẤT NHUỘM MÀU DIRECT BLACK 22 BẰNG VẬT LIỆU Mg/Al LDH- ZEOLIT

“…Tác giả Ayşe Dinçer và cộng sự (2019) cũng đã cho thấy giá trị pH = 3 là tối ưu khi hấp phụ chất nhuộm màu reactive black 5 bằng vỏ trứng [11]. Giá trị pH = 3 là pH hấp phụ tối ưu trong nghiên cứu hấp phụ chất nhuộm màu reactive red 21 (RR21) bằng than sinh học từ vỏ bưởi biến tính Fe3O4 [12].…”