Abstract
Background: The presence of toxic pollutants in water sources has become a major issue worldwide and different technologies have been applied for water treatment such as chemical precipitation, ionic interchange, adsorption, membrane filtration, flocculation, among others. In the last decades, nanotechnology has gain attention in the development of nanomaterials for removing these pollutants. Objectives: In this work, Hg (II) and Cr (II) adsorption process was studied using residual biomass (orange peels, corn cob and oil palm bagasse) modified with Al2 O3 nanoparticles. Methods/ Analysis: The biomasses before and after modification were characterized by FT-IR analysis in order to determine main functional groups. In addition, XRD technique was used to calculate average crystallite size and identify both γ and δ alumina. Findings: It was found that suitable conditions for further experiments were particle size of 0.355 mm and pH values of 2 and 6 for Cr (VI) and Hg (II), respectively. For Hg (II) ions, the highest removal yields were 70.89, 34.18 and 54.9 % using OPB-Al2 O3 , CC-Al2 O3 and OP-Al2 O3 , respectively. For Cr (VI) ions, these values were 48.2, 39.8 and 30.5 % using OPB-Al2 O3 , CC-Al2 O3 and OP-Al2 O3 , respectively. Novelty/Improvement: These results suggested that OPB-Al2 O3 can be successfully used in removing Cr (VI) and Hg (II) with higher efficiency than the others synthesized biosorbents. Keywords: Al2 O3 Nanoparticles, Biomass, Biosorption, Nanomaterials
Highlights
The rapidly expanding industrial and domestic activities have led an increase of pollutants in water sources[1]
The orange peels biomass exhibited absorption band around 3330 cm-1 attributed to O-H stretching vibrations of alcohols, phenols and carboxylic acids in pectin, cellulose and lignin molecules
The spectrum of corn cob biomass shows a wide band at 1012 and 3405 cm-1 assigned to C-O stretching vibrations and H-bonding, respectively
Summary
The rapidly expanding industrial and domestic activities have led an increase of pollutants in water sources[1]. These toxic contaminants are broadly classified into three main types-heavy metals, metalloids and pesticides[2]. A large number of methods have been studied in order to solve the problem of heavy metals release such as coagulation-flocculation, chemical precipitation, filtration, sedimentation and ion exchange[7] impregnating sequence and the gas composition have significant effect on the performance of the adsorbents. For Hg (II) ions, the highest removal yields were 70.89, 34.18 and 54.9 % using OPB-Al2O3, CC-Al2O3 and OP-Al2O3, respectively. For Cr (VI) ions, these values were 48.2, 39.8 and 30.5 % using OPB-Al2O3, CC-Al2O3 and OP-Al2O3, respectively. Novelty/Improvement: These results suggested that OPB-Al2O3 can be successfully used in removing Cr (VI) and Hg (II) with higher efficiency than the others synthesized biosorbents
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