Abstract
Rhodamine B (RhB) is widely employed in dyeing in textile, paper, paints and leather industry. The wastewater containing RhB dye can cause serious environmental and biological problems. Hence, the remediation of RhB treatment is necessary for the environment. In this study, the photodegradation of RhB in water under sunlight irradiation with dye-sensitized titanium dioxide (TiO2) is investigated. The influence of various conditions, such as TiO2 dosages, initial RhB concentration, temperature, pH, sunlight intensity and irradiation time on the photodegradation of RhB are also studied. About 96% of RhB is photodegraded within 20 min under the optimized conditions. Therefore, the photodegradation treatment for the wastewater including RhB under sunlight is very simple, easy and low cost technique.
Highlights
Organic dyes have a wide range of application areas in the textile and food industries
The following analytical grade chemicals were used in this study rhodamine B, TiO2 powder (80% anatase and 20% rutile), NaOH and HCl
0–30 mg of TiO2 powder was added into 30 mL aqueous Rhodamine B (RhB) of 5–20 mg/L in the beakers
Summary
Organic dyes have a wide range of application areas in the textile and food industries. The residues of textile industries are the major pollutants to contaminate water and affect aquatic life as well as human life (Gao et al, 2019). Colored organic dyes from industries are mostly nonbiodegradable, creating high toxicity to the aquatic creatures and drastically disturb the water ecosystem (Sakib et al, 2019; Ge et al, 2016). RhB dye is hazardous, dangerous, poisonous, carcinogenic, allergenic and teratogenic to human beings (Bhowmilk et al, 2015). It is necessary to degrade the dyes in effluents, at least to decolorize them before effluent disposal to the environment. The semiconductor nanomaterials have been applied as promising photocatalyst for the effective degradation of organic dyes for purifying water (Dhanabal and Velmathi, 2016)
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