Pulverized river shellfish shells as a 904 cheap adsorbent for removing of malathion from water: Examination of the isotherms, kinetics, thermodynamics and optimization of the experimental conditions by the response surface method

Introduction/purpose: In this study, we investigated the possibility of removing organophosphorus pesticide malathion from water using a new adsorbent based on biowaste river shell shards Anodonta Sinadonta woodiane family, material that accumulates in large quantities as waste banks rivers. Two adsorbents were tested - mechanically comminuted shells (MRM) and mechanosynthetic hydroxyapatite (RMHAp). Methods: The obtained characterized for removal water. order to predict optimal adsorption conditions Response Surface Method (RSM), authors influence variable factors (adsorption conditions), pH values, doses, contact times, temperatures capacity. Results: best was achieved at mean values between 6.0 7.0. data 25, 35, 45 °C compared Langmuir, Freundlich, DubininRadushkevich (DR), Temkin isothermal models, well pseudofirst order, pseudo-second Elovic kinetic models modeling kinetics. maximum Langmuir capacity MRM RMHAp 25 46,462 mg g-1 78,311 , respectively. Conclusion: results have showed both follows model Freundlich model. thermodynamic parameters indicate endothermic, feasible, spontaneous nature process.