Experimental Study on Thermal Desorption of Rhodamine B Contaminated Soil

Abstract

In recent years, rhodamine B in soil has increasingly polluted the natural environment, so it is important to explore suitable treatment techniques. In this paper, thermal desorption repair technology was used to treat rhodamine B in experimentally simulated contaminated soil. Single factor experiments were designed to study the influences of different factors on the desorption rate. The results showed that different heating temperatures, heating times, soil initial moisture contents and rhodamine B initial concentrations could lead to different desorption efficiencies of rhodamine B in soil samples. When the initial concentration of rhodamine B was 90.91~915.08 mg/kg, the desorption rate was in the range of 31.87%~79.19% under the conditions of a heating temperature of 300 °C, a soil initial moisture content of 15% and a heating time of 50 min. Our work could provide theoretical support for the promotion and application of thermal desorption technology in the repair of rhodamine B contaminated soil.