Abstract
This work is devoted to the investigation of the discoloration of the synthetic and industrial effluent, using a quarry residue (MbP), which is a material naturally composed of mixed oxides, compared to zinc oxide (ZnO), acting as photocatalysts and adsorbents. The optimization of the pH and catalyst concentration parameters was carried out, and the industrial effluent was then treated by photocatalytic reactions, adsorption, and photolysis. Industrial effluent was supplied by a packaging company and was collected for a period of seven consecutive days, showing the oscillation of the parameters in the process. The material characterizations were obtained by scanning electron microscopy (SEM-EDS), X-Ray diffraction (XRD), and photoacoustic spectroscopy (PAS). The results indicated that the composition of the quarry waste is mainly silica and has Egap 2.16 eV. The quarry residue as photocatalyst was active for the artificial effluent (synthetic dye solution), with a maximum of 98% discoloration, and as an adsorbent for industrial effluent, with a maximum of 57% of discoloration. Although the quarry residue has shown results lower than ZnO, it is considered a promising material in adsorption processes and photocatalytic reactions for discoloration of aqueous solutions.
Highlights
Dyes are chemical compounds that have the ability to color the surface of materials such as fabric fibers, packaging, and food
There are many variables that must be considered in order, such as the radiation source, pH of the reaction medium, temperature, and material used as a semiconductor material
The materials used as catalysts and adsorbents were (i) zinc oxide (ZnO) as a reference material, supplied by Dinâmica Química Ltd.a (Sao Paulo, Brazil) and (ii) quarry residue, in this work defined as a mineral by-product (MbP)
Summary
Dyes are chemical compounds that have the ability to color the surface of materials such as fabric fibers, packaging, and food. The main materials used in the photoreactions are TiO2 and ZnO as they are nontoxic and have good photochemical properties [13,14,15,16]; researchers commonly describe improvements in the catalysts’ properties through new syntheses [17], the addition of metals [18,19], mixed oxides, etc In this direction, the search for new catalytic materials is a very interesting and encouraging subject, if this new material is a by-product in large quantities or a waste product without the exact destination of any industrial process. Using this type of in-water treatment waste is a recent and promising proposal In this context, the present work contributes with a new material catalytic/adsorbent material, giving value a residue, as an alternative to traditional catalysts/adsorbent (mineral by-product). The photocatalytic and adsorptive capacity of the stone powder was evaluated in the discoloration, applied both to the synthetic effluent and to the industrial effluent
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