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Catalytic Ozonation of Ponceau 4R Using Multifunctional Magnetic Biochar Prepared from Rubber Seed Shell

100%

Nguyen H. M. , Truong T. T. B. , Nguyen H.-H. T. , Tran P. T. , Tran-Thuy T.-M. , Nguyen L. Q. , Nguyen D. V.

Journal of Ecological Engineering

2023

tom Vol. 24, nr 12

143--151

Herein, abundant and underutilized rubber seed shell (RSS) was valorized for one-pot production of multifunctional magnetic biochar (MBC) through one-pot FeCl3 activation. Fe3O4 and Fe0 crystals were formed in MBC, providing a saturation magnetization of 6.83 emu/g. In addition, the material had a specific surface area of 378 m2/g and a total pore volume of 0.22 cm3/g. MBC was subsequently explored for catalytic ozonation of Ponceau 4R (P4R). As a result, MBC enhanced P4R ozonation in a broad pH range of 3.0–9.0. At pH 5.8, the pseudo-first-order rate constant of P4R decolorization with MBC improved by 50% compared to that without MBC. Summarily, RSS-derived MBC is a potential catalyst for enhanced ozonation of Ponceau 4R thanks to its low cost, eco-friendliness, relative effectiveness, and magnetic separability.

Valorization of Tropical Almond (Terminalia catappa) Leaves into Iron-Containing Activated Carbon for Rapid Catalytic Degradation of Methylene Blue with Hydrogen Peroxide

84%

Nguyen N. T. K. , Le D. T. T. , Vo K. D. , Huynh L. T. , Nguyen H. M. , Tran-Thuy T.-M. , Nguyen L. Q. , Van Nguyen D.

Journal of Ecological Engineering

2024

tom Vol. 25, nr 8

54--61

This study sought to use tropical almond leaves (TALs) for the simple fabrication of iron-containing activated carbon (IAC). Iron precursor (FeCl3 ) and activating agent (KOH) were sequentially preloaded in TALs. One-pot pyrolysis then generated iron-based particles (8.7 wt%), mainly metallic iron crystals, within AC support. The specific saturation magnetization of IAC was measured to be 48.9 emu/g, highlighting its ability to be efficiently separated using external magnetic fields. Moreover, the activation process yielded IAC with a large total volume of 0.28 cm3/g and a high specific surface area of 463 m2/g. Accordingly, IAC was investigated as an oxidation catalyst to degrade methylene blue (MB) by H2O2. At pH 3.0, 800 ppm H2O2, and 0.10 g/L IAC, 95.3% of MB (200 ppm) was removed after 30 min of adsorption and 60 min of oxidation. Altogether, iron-containing activated carbon from fallen leaves of tropical almonds proved its potential for robust methylene blue degradation by H2O2.