Abstract
Degumming is the most important link in the textile industry. The main purpose of degumming is to effectively remove non-cellulose substances in plant bast fibers. In this research, we propose an electro-Fenton (EF) system with a nickel-foam (Ni-F) cathode in weak acid pH (EF/Ni-F) to degum cannabis fiber in EF while reducing the content of pollutants in degumming wastewater. FT-IR, XPS, XRD, SEM, and TG were employed to thoroughly understand the reaction characteristics to characterize chemical components, element qualities, the crystallinity, and the morphologies of degummed fibers. Additionally, physical and mechanical properties such as breaking strength, elongation at breaking, residual glue rate, whiteness, and diameter of degummed fibers were measured. Through testing, it was found that the fiber degummed by the EF method had higher breaking strength, lower residual tackiness, and higher whiteness than other methods. The antibacterial test was used to detect the effect of fiber on Staphylococcus aureus before and after degumming. EF could remove more colloidal components from cannabis than other methods, and the mechanical properties were also enhanced. The characteristics of the degummed fiber further confirmed the effectiveness of the new degumming method. Moreover, the antibacterial experiment found that the antibacterial property of the degummed fiber was enhanced. The colloidal components in the degumming wastewater were flocculated and precipitated. The upper liquid of the solution had low chromaticity, low COD value, and weak acid pH value, which can meet the discharge requirements. The above test proves that EF is an effective degumming method that is environmentally friendly, takes less time, and enhances antibacterial performance.
Highlights
Cannabis fiber, as a natural and renewable textile fiber [1], has attracted great interest due to its excellent properties in various fields
The use of foamed nickel as the cathode accelerates the occurrence of electrical reactions to assist the Fenton system to decompose oxidative free radicals and H2O2 acts on the external colloid of cannabis fiber, so that the colloid is degraded into small molecules and dispersed in the solution to achieve the purpose of degumming
A high percentage of lignin may result in a harsh handle of cannabis fiber [23]
Summary
As a natural and renewable textile fiber [1], has attracted great interest due to its excellent properties in various fields. Through electron transfer and other means, the colloidal organic matter in the wastewater is oxidized and decomposed into small molecules, CO2 and H2O2, so as to achieve the purpose of degrading COD. The use of foamed nickel as the cathode accelerates the occurrence of electrical reactions to assist the Fenton system to decompose oxidative free radicals and H2O2 acts on the external colloid of cannabis fiber, so that the colloid is degraded into small molecules and dispersed in the solution to achieve the purpose of degumming. The electroFenton process is regarded as an efficient and environmentally friendly method to replace traditional degumming processes for fiber degumming, and as a solution to the problem of difficult treatment of organic matter in wastewater after degumming.
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