Abstract
Hinai green tuff, which is found in Akita Prefecture, Japan, is used for the production of building materials, etc. About 60% of all stone is emitted as waste powder and therefore it is important to find ways for recycling it. In this work, the characteristics of green tuff powder have been investigated. The results of scanning electron microscope (SEM) and elemental map observations indicate that the green tuff contains TiO2 on zeolite. The green tuff can therefore be used as a natural catalyst for producing hydrogen peroxide with moisture and oxygen with light. The optimum calcined temperature of the green tuff powder is about 800 °C, producing the hydroxyl radical from hydrogen peroxide decomposition without ultraviolet light (UV) and decomposition of the superoxide anion. As the application of green tuff powder, Cavendish banana trees found in the Philippines infected by a new Panama disease were treated with powder suspension in order to remove the fungus (a type of Fusarium wilt) due to the photocatalyst characteristics of powder. The suspension, prepared by using the powder was sprayed on the infected banana trees for about one month. Photograph observation indicated that the so-called 800 °C suspension spray was more effective in growing the infected banana trees.
Highlights
Green tuff is a sedimentary rock formed in rivers and lakes from 20 million to 15 million years ago and distributed widely along the Sea of Japan coast of the Japanese archipelago [1]
The produced hydrogen peroxide can be decomposed by higher alkaline [17], ultraviolet light (UV) light irradiation, and the Fenton reaction with the can decomposed by higherofalkaline
The green tuff powder was calcined at temperatures ranging from 200 ◦ C to 1200 ◦ C for 30 min, The green tuff powder was calcined at temperatures ranging from 200 °C to 1200 °C for 30 min, and the calcined powder was kept dry
Summary
Green tuff is a sedimentary rock formed in rivers and lakes from 20 million to 15 million years ago and distributed widely along the Sea of Japan coast of the Japanese archipelago [1]. The zeolitic adsorbent is synthesized from green tuff by hydrothermal treatment and the silver ion adsorption has been studied [8]. The produced hydrogen peroxide can be decomposed by higher alkaline [17], UV light irradiation, and the Fenton reaction with the can decomposed by higherofalkaline [17], UV light irradiation, and the tree For the application this phenomena, the removal of banana fungi is investigated. Cubense (FOC), Cavendish banana is under threatnofrom a virulent fungus, Fusarium oxysporum sp. The photograph in Figure shows the early symptoms such as wilting as wilting and leaf-yellowing of the banana tree in this experimental field in the Philippines. 1. Photograph of early symptoms such as wilting and leaf-yellowing of a banana tree in this this.
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