NiAl‐LDH Derived Mixed Metal Oxides as Effective Catalysts for Advanced Oxidation‐Based Dye Degradation

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ABSTRACT The rapid increase in manufacturing of synthetic dyes in industrial effluent has raised major environmental and health concerns owing to their toxicity and resistance to conventional treatment methods. In the present work, NiAl‐layered double hydroxide (LDH) has been synthesized by using various interlayer anions in the form of (Cl − ) [N1], (NO 3 − ) [N2], (CO 3 2− ) [N3], and LDH‐derived NiAl mixed metals oxides [N4]. Ni‐based LDH and Mixed Metal Oxide displayed the ultrasonic (US) and ultraviolet (UV) light‐assisted degradation of Congo Red (CR) and Rhodamine Blue (RhB) dyes. As prepared LDH and MMO materials demonstrated effective sonophotocatalytic performance toward CR dye achieving [N1(>75 %), N2(>87 %), N3(>96 %), N4(>97 %)]. In sonophotocatalytic activity, N4 materials exhibited higher degradation efficiency of CR dye (>97 %) as compared to degradation of RhB (>95 %) dye due to the synergistic effect of US waves and UV light irradiation. The results of kinetic analysis (pseudo‐first/second‐order kinetic model) reveal that CR dye degradation in the presence of N4 materials is well described by a pseudo‐second‐order kinetic model, as shown by the higher value of regression coefficient (R 2 = 0.9986). These findings indicate N4 can act as a promising materials for wastewater treatment, especially in removal of harmful dyes.

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