article · Applied Water Science
Agricultural waste in the form of guava leaves can be converted into activated carbon for the removal of Congo red dye from liquid solutions. Characterisation reveals that this guava leaf-derived carbonaceous material possesses a carbon content of 86.84 percent. In laboratory adsorption testing, the uptake behaviour corresponds best to the Freundlich isotherm model, while the kinetic data align with a pseudo-second-order model with intraparticle diffusion contributing to the overall mechanism. Analysis of adsorption energy indicates a physical adsorption process, which thermodynamic testing confirms to be both spontaneous and exothermic across tested temperatures. The material achieves a maximum adsorption capacity of 47.62 milligrams of dye per gram of adsorbent. These findings demonstrate that activated carbon prepared from guava leaves serves as an effective medium for capturing Congo red dye from water.
Industrial dyes such as Congo red pose environmental risks when discharged into water sources. Converting abundant agricultural waste like guava leaves into activated carbon provides an alternative method for purifying contaminated water. Demonstrating that the adsorption process is spontaneous, exothermic, and physically driven provides foundational data for developing sustainable water treatment techniques using low-cost organic waste.
The work addresses wastewater treatment applications, specifically targeting the removal of synthetic dyes for industrial water purification operators. At this stage, the research represents early-stage laboratory testing of adsorbent preparation, kinetics, and capacity in aqueous solutions. Transitioning this approach towards commercial use would require pilot-scale validation, continuous-flow trials, and assessment of material regeneration and manufacturing costs.
AI-generated from the published abstract. Always read the original work before citing.
Guava leaf, a waste material, was treated and activated to prepare adsorbent. The adsorbent was characterized using Scanning Electron Microscopy (SEM), Fourier Transform Infra Red (FTIR) and Energy-Dispersive X-ray (EDX) techniques. The carbonaceous adsorbent prepared from guava leaf had appreciable carbon content (86.84 %). The adsorption of Congo red dye onto guava leaf-based activated carbon (GLAC) was studied in this research. Experimental data were analyzed by four different model equations: Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms and it was found to fit Freundlich equation most. Adsorption rate constants were determined using pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion model equations. The results clearly showed that the adsorption of CR dye onto GLAC followed pseudo-second-order kinetic model. Intraparticle diffusion was involved in the adsorption process. The mean energy of adsorption calculated from D-R isotherm confirmed the involvement of physical adsorption. Thermodynamic parameters were obtained and it was found that the adsorption of CR dye onto GLAC was an exothermic and spontaneous process at the temperatures under investigation. The maximum adsorption of CR dye by GLAC was found to be 47.62 mg/g. The study shows that GLAC is an effective adsorbent for the adsorption of CR dye from aqueous solution.
This page summarises published work. The authoritative version sits with the publisher.
DOI: 10.1007/s13201-015-0375-y
Is something wrong with this record? Report it or request removal.
Discussion
Have you built on this work, tried to replicate it, or seen it applied in practice? Share what you know. Verified researchers and MARATTO™ domain experts can open a discussion, and any member can reply. Contributions are reviewed before they appear.
No discussion yet. Open the first thread.
New to MARATTO™? Create a free account.
