Abstract
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 Fe3O4 particles supported biochar from peanut shell (PS-Fe3O4) for removal of Pb(II) ions from aqueous solution was investigated. The characterization of PS-Fe3O4 composites showed that biochar was successfully coated with porous nanoscale Fe3O4 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-Fe3O4 composites was a spontaneous and endothermic process. The adsorption mechanisms of Pb(II) ions by PS-Fe3O4 composites were mainly controlled by the chemical adsorption process. The maximum adsorption capacity of Pb(II) ions removal in solution by PS-Fe3O4 composites reached 188.68 mg/g. The removal mechanism included Fe-O coordination reaction, co-precipitation, complexation reaction, and ion exchange. PS-Fe3O4 composites were thought as a low-cost, good regeneration performance, and high efficiency adsorption material for removal of Pb(II) ions in solution.
Highlights
At present, the large amounts of heavy metal from landscape wastewater have become serious problems of environmental pollution and risks for human health
peanut shell (PS)-Fe3O4 composites were thought as a low-cost, good regeneration performance and high efficiency adsorption material for removal of Pb(II) ions in solution
The samples of PS and PS-Fe3O4 were characterized by N2-BET adsorption method, scanning electron microscope (SEM), energy dispersive X-ray spectra (EDS), transmission electron microscope (TEM), X-ray diffraction (XRD), Infrared spectrometer (FT-IR) and X-ray photoelectron spectroscopy (XPS), respectively
Summary
The large amounts of heavy metal from landscape wastewater have become serious problems of environmental pollution and risks for human health It affects the growth of aquatic, and leads to the destruction of landscape (Castaneda et al 2019). These heavy metals in aquatic pollution would lead to occurrence of carcinogen in human according to US National Toxicology Program (Hokkanen et al 2016). Lead (Pb) is one of most hazardous, toxic and non-biodegradable heavy metals (Karunanayake et al 2018) It can enter the human body through respiratory tract, food chain and drinking water (Thanh et al 2018; Sahan 2019). It was very interesting to develop the nanoscale Fe3O4 particles supported biochar from biomass for heavy metals removal in solution. The successful application of peanut shells could effectively deal with heavy metal pollution, and contribute to the recycling of peanut shells
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