Abstract
The present study aimed to contribute the photocatalytic degradation of Acid Brown dye (AB) found in leather industry wastewater in presence of new triple molybdate NaLi1.07Co2.94(MoO4)5 under sunlight. The new photocatalyst has been synthesized by a solid state reaction method and characterized using X-ray Powder Diffraction (XRPD), Raman, FTIR, Scanning Electron Microscopy (SEM), UV–vis–NIR spectrophotometry. It crystallizes in the triclinic system, space group P-1with the unit cell parameters are: a = 6.881(2) Å, b = 6.968(2) Å, c = 17.696(6) Å, α = 87.540(5)°, β = 87.785(5)° and γ = 78.403(7)°. The structure can be described by the succession of different types of layers connected by sharing vertices and edges to lead a three-dimensional framework with tunnels in which the Na + cations reside. Raman and IR studies confirm the existence of MoO42− functional groups. The title compound is a wide-band-gap semiconductor with a value around 3.3 eV. The photocatalytic decomposition of Acid Brown organic dye load in tannery wastewater was studied. Significant results for chemical oxygen demand (COD) and color removal were achieved. A maximum of 56% removal dyes was attained after 5 h. With the addition of hydrogen peroxide as an oxidant, the degradation efficiency increased to 90% and an important reduction in the COD were observed. The photodegradation kinetics favorably followed the pseudo-first-order with a constant k of 2.9 10−1 h−1 in presence of H2O2 and 1.5 10−1 h−1 without adding any oxidant. The proposed leather wastewater treatment process is an attractive alternative highly recommended for wastewater treatment.
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