Comparative Study of the Selective Sorption of Organic Dyes on Inorganic Materials—A Cost-Effective Method for Waste Treatment in Educational and Small Research Laboratories

Abstract

Educational and research laboratories often produce relatively small amounts of highly diverse organic wastes. Treating waste can contribute significantly to the cost of running laboratories. This study introduced a simple and economical waste management system such that readily available used chromatography-grade inorganic materials, such as silica and alumina (basic and acidic), are utilized to treat remnant dye solutions and solution wastes from educational and small research laboratories. To recycle the adsorbents, they were heated to 600 °C, where the adsorbates were combusted. The results showed that acidic alumina is an effective adsorbent material for azo dyes and anionic dyes/stains, as well as textile dyes, with a 98 to 100% removal efficiency. Furthermore, alumina and silica possess excellent regeneration properties, where the dye removal efficiency of the materials was retained after regeneration at 600 °C. The adsorption properties of the materials were compared with those of aliginite and activated biomass from coffee grounds. Kinetic and thermodynamic studies of the sorption processes on the different materials were carried out. Overall, the inorganic materials used were efficient at removing contaminating remnant organic dyes stemming from educational and small research laboratories.

Removal of Dye from Aquatic Environments: State-of-the-Art and Future Perspectives

“…Another effective method for the removal of dye, due to its low cost and easy installation, is adsorption [15]. El Mansouri et al [16] removed up to 62% of Eriochrome Black T (EBT) using H 3 PO 4 -modified activated carbon (derived from Cannabis sativa L.) at a pH of 7, a contact time of 3 h, and an initial concentration of dye at 10 mg•L −1 .…”

“…Moreover, in this study, the maximum adsorption capacity was 14.02 (mg•g −1 ) in terms of the Langmuir isotherm study. In another study, 98-100% of azo dyes, anionic dyes/stains and textile dyes were removed using acidic alumina as an adsorbent [15] at an acidic pH and a contact time of more than 30 min. More than 90% of Disperse Red (DR) and Disperse Orange (DO) were removed using olive pomace as a biosorbent [17].…”

Recyclable Waste Classification using SquezeeNet and XGBoost

“…Technology has improved segregation precision and consistency, exceeding hand sorting. Organic trash, including food scraps, leaves, and other biodegradable materials, may be distinguished from recyclable garbage like plastic, paper, and metal with great precision [16][17][18][19][20][21]. Implementing waste separation techniques requires a categorization system that can www.ijacsa.thesai.org independently distinguish organic and recyclable components.…”