Kinetic investigation on sonocatalytic degradation of methylene blue in the presence of La:ZnO/GO

Degradation of organic pollutants is a potential source of water protection in the world. According to different reports, the industries in many developed and developing countries discharge about 70% of their waste products directly and without any filtration into surface water [1]. In recent decades, the use of heterogeneous catalysts in the presence of eco-friendly source such as light and ultrasound radiation as eco-friendly technology has attracted global attention [2].The degradation of pollutant by ultrasound radiation requires a lot of energy and a complete degradation is rarely done; to overcome this restriction, using a heterogeneous catalyst with ultrasound radiation, which is called the sonocatalytic process, is recommended. Lanthanum doped Zinc oxide/graphene oxide (La:ZnO/GO) heterostructures were synthesized via a simple method. The obtained (La:ZnO/GO) Composites were characterized by the XRD, FT-IR, TEM, SEM, EDS, DRS analyses. The potential of La:ZnO/GO, has been explored as an effective catalyst for the sono-degradation of Methylene blue (MB). The effects of process parameters such as, catalyst dosage, initial dye concentration and irradiation time on the extent of sono-degradation efficiency have been investigated. The results show that process matched well with the Langmuir–Hinshelwood (L–H) kinetic model.