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An experimental class to illustrate the physical and chemical effects of ultrasound as an introduction to practical advanced oxidation processes

Year: 2024
Type: article
Abstract: • Introductory experimental class to sonochemical advanced oxidation processes. • Physical and chemical effects of ultrasound depending on frequency are illustrated. • Learning on sonogenerated H 2 O 2 quantification and sonodegradation of a model compound. • A short-written report and its feedback are proposed as an evaluation strategy. This work presents the development of an illustrative experimental class about the mechanical and chemical effects of ultrasound to introduce students to the field of sonochemical advanced oxidation processes. Ultrasound equipment at low frequency (<100 kHz) and mid-high frequency (200–500 kHz), in addition to basic laboratory equipment (glassware instruments and a spectrophotometer) and accessible reagents (commercial activated carbon, potassium iodide, ammonium heptamolybdate, distilled water, and methyl orange) are required. Under the teacher’s supervision, the students will perform experiments on the sonication of activated carbon in water to learn about the mechanical effects. Meanwhile, to evidence the chemical effects, the water sonolysis to produce hydrogen peroxide , and the degradation of a model organic pollutant (methyl orange) are carried out. In qualitative aspects, the students will learn the predominant effects as a function of the ultrasound frequency. From a practical point of view, the students are expected to learn how to quantify the sonogenerated hydrogen peroxide and follow the sonochemical degradation of a model compound. Besides, a short-written report and its feedback are presented as the evaluation strategy for the learning of students.
DOI: 10.1016/j.ultsonch.2024.107196
Language: English
Open Access status: gold
Estimated APC paid: $2,700
OpenAlex ID: W4405365217
FWCI: 0.189
Cites: 18
Cited by: 2
Related to: 10