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

Nguyen Hung Minh, Truong Tram Thi Bao, Nguyen Hong-Hue Thi, Tran Phong Thanh, Tran-Thuy Tuyet-Mai, Nguyen Long Quang, Nguyen Dung Van

Journal of Ecological Engineering

2023

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.

The resolution of ternary mixtures of dyes by partial least-square multivariate spectrophotometric calibration and derivative spectrophotometry

Özgür M. Ü., Koyuncu Ý., Bozdoğan A.

Chemia Analityczna

2005

Vol. 50, No. 3

605-614

Simple and fast spectrophotometric methods for the determination of the components of ternary mixtures of dyes have been proposed. For the simultaneous determination of Sunset Yellow (E110), Tartrazine (E102), and Ponceau 4R (Ł124) in granulated drinks partial least square (PLS) method was applied to the spectrophotometric data in the range 400-600 nm, at 10 nm intervals. In the procedure 27 standard mixtures of three assayed compounds at three concentration levels were used. Absorbance measurements were performed in methanolic solutions. The results were compared with those obtained using a common derivative spectrophotometric procedure (zero-crossing technique). These procedures did not require any separation steps. Statistical evaluation of the method bias was performed. It was concluded that PLS method might be competitive with derivative procedure for the separation of ternary mixtures of dyes.

Zaproponowano proste i szybkie metody spcktrofotomctryczne rozróżniania bawników w trójskładnikowej mieszaninie. W celu jednoczesnego oznaczenia El l O (Sunset Yellow), E102 (Tartrazine) i E124 (Ponceau 4R) w granulowanych napojach za pomocą cząstkowej metody najmniejszych kwadratów, mierzono absorbancję co 10 nm w zakresie 400-600 nm. W metodzie tej wykorzystywano 27 wzorcowych mieszanin tych trzech barwników w metanolu, na trzech poziomach stężeń. Uzyskane wyniki porównano z wynikami zwykle stosowanej metody spektrofotometrii pochodnej. Procedury te nie wymagają rozdzielania barwników. Przeprowadzono statystyczną ocenę obciążenia i stwierdzono, że cząstkowa metoda najmniejszych kwadratów (PLS) jest konkurencyjna w stosunku do pomiarów metodą spektrofotometrii pochodnej.