Iron-rich lateritic soil with mesoporous structure effective for heterogeneous Fenton-type degradation of methylene blue
摘要
In this present study, a simple low-cost technique was utilized to modify a lateritic soil used as a catalyst for heterogeneous Fenton degradation of methylene blue (MB). The catalysts were prepared by activating laterite (LB) substrate in sulfuric (LAS) and phosphoric (LAP) acids to develop the iron oxide. The LB, LAS, and LAP samples under went characterization using BET, SEM, XRD, FTIR, and EDS. The catalysts containing a high concentration of iron oxides were shown to be highly successful in removing pollutants from wastewater. This study assesses the impact of varying hydrogen peroxide concentration, catalyst dose, starting pH, and MB concentration on the effectiveness of the Fenton heterogeneous process. The experimental findings demonstrated that the heterogeneous Fenton process can be elucidated by employing the Langmuir–Hinshelwood kinetic model. The results indicated that a concentration of 40 mg L−1 can be eliminated in a mere 30 min under optimal conditions of 2 mmol L–1 H2O2 and 0.5 g L–1 at a pH of 4, at room temperature, with the greatest degradation efficiency of 96.77%. The amount of iron leached was evaluated for different catalysts. The result shows a very low leaching for LAS catalyst of up to 2 mg L−1.