Functionalized porous nanoscale Fe 3 O 4 particles supported biochar from peanut shell for Pb(II) ions removal from landscape wastewater

The large amounts ofheavy metal from landscape wastewater have become serious problems of environmental pollution and risks for human health. The development of efficient novel adsorbent is a very important for treatment of heavy metal. The functionalized porous nanoscale Fe 3 O 4 particles supported biochar from peanut shell (PS-Fe 3 O 4 ) for removal of Pb(II) ions from aqueous solution was investigated. The characterization of PS-Fe 3 O 4 composites showed that biochar was successfully coated with porous nanoscale Fe 3 O 4 particles. The pseudo second-order kinetic model and Langmuir model were more fitted for describing the adsorption process of Pb(II) ions in solution. The adsorption process of Pb(II) ions removal by PS-Fe 3 O 4 composites was a spontaneous and endothermic process. The adsorption mechanisms of Pb(II) ions by PS-Fe 3 O 4 composites were mainly controlled by the chemical adsorption process. The maximum adsorption capacity of Pb(II) ions removal in solution by PS-Fe 3 O 4 composites reached 188.68 mg/g. The removal mechanism included Fe–O coordination reaction, co-precipitation, complexation reaction, and ion exchange. PS-Fe 3 O 4 composites were thought as a low-cost, good regeneration performance, and high efficiency adsorption material for removal of Pb(II) ions in solution.