Adsorption of Metaldehyde by Oil Palm Kernel Biochar and Rice Husk Biochar: A Comparative Study

Abstract

Metaldehyde is a toxic molluscicide that has the potential to contaminate water supplies and damage aquatic life. Existing water treatment methods are ineffective at removing it from water bodies. In this study, oil palm kernel biochar (OPKB) and rice husk biochar (RHB) were utilized to assess metaldehyde adsorption. Using a batch adsorption approach, the physicochemical parameters of biochar and their metaldehyde adsorption capacities were investigated. The results indicated that the metaldehyde adsorption capacities of both varieties of biochar are significant. Considering the initial concentration of metaldehyde, contact time, and adsorbent dosages, OPKB demonstrated a higher metaldehyde adsorption capacity than RHB. The study examined metaldehyde’s effects on OPKB and RHB using Langmuir and Freundlich isotherms. Both models provided a good fit, with the Freundlich model slightly better fitting. The study also used pseudo-first and second order kinetic models, revealing that the adsorption process follows pseudo-second-order kinetics for both biochar. This information can aid in developing efficient and successful metaldehyde removal technologies from contaminated water sources. This study showed that oil palm biochar has the potential to be an effective adsorbent for removing metaldehyde from contaminated water.