Novel Dendrimerlike Magnetic Biosorbent Based on Modified Orange Peel Waste: Adsorption–Reduction Behavior of Arsenic

Abstract

In this work, a novel porous biosorbent (HF-D) based on orange peel (OP) was prepared by an efficient and simple method. The prepared HF-D showed well-ordered dendrimerlike structures and remarkable adsorption performance for the removal of arsenic. Particularly, morphology and structure details proved that the dendrimerlike structure was formed by surrounding the crystal iron nanoparticles with amorphous carbon. Furthermore, the influence of various environmental factors (initial pH, coexisting inorganic ions, humic substances, etc.) on the adsorption of As­(V) was investigated. An extraordinary As­(V) adsorption capacity (81.3 mg/g) has been observed when the Fe/biomass ratio was 10 wt %. Adsorption and characterization data proved that the behavior of As­(V) on HF-D was an adsorption–reduction process, including complex adsorption and inner reduction. In addition, the adsorption kinetics and isotherms were analyzed. The regeneration and application in groundwater solution of the prepared HF-D were discussed. This study not only provides an efficient biosorbent for removing arsenic but also a low cost and environmentally friendly method for synthesizing porous biomass based materials.

Mechanochemical Preparation of Magnetically Separable Fe and Cu-Based Bimetallic Nanocatalysts for Vanillin Production

“…Ref. [22] However, at higher temperature, namely at 400 • C, such structure collapsed (see Figure 2d), most likely due to cellulose and hemicellulose degradation between 250-360 • C. [29] Figure 2. Scanning electron microscopy (SEM) micrographs of (a) Cu-Fe@OP100 • C, (b) Cu-Fe@OP200 • C, (c) Cu-Fe@OP300…”

“…Ref. [ 22 ] However, at higher temperature, namely at 400 °C, such structure collapsed (see Figure 2 d), most likely due to cellulose and hemicellulose degradation between 250–360 °C. [ 29 ]…”

“…Orange peel residues have been widely investigated due to their potential application to obtain value-added products (D-limonene, pectin) [ 19 ], biogas, [ 20 ] biofuel, [ 21 ] bio-absorbents [ 22 ], and active carbon [ 23 ]. Furthermore, orange peel wastes have been employed to obtain metal oxides nanoparticles, through sacrificial template approaches [ 24 ], and for the preparation of porous bio-sorbents [ 22 ].…”

“…Orange peel residues have been widely investigated due to their potential application to obtain value-added products (D-limonene, pectin) [19], biogas, [20] biofuel, [21] bioabsorbents [22], and active carbon [23]. Furthermore, orange peel wastes have been employed to obtain metal oxides nanoparticles, through sacrificial template approaches [24], and for the preparation of porous bio-sorbents [22]. Outstandingly, mechanochemical-assisted extraction methodologies could lead to highly efficient and environmentally friendly processes, reducing or even avoiding the use of solvents and additional reagents.…”

Design of Gravel‐Sand Filter for Arsenic Removal: A Case Study of Muzaffargarh District in Pakistan

“…Raw water is sustained for two hours in inlet compartment simultaneously exposing to air (oxygen). Therefore As (III) and Fe (II) are oxidized to As (V) and Fe (III) respectively (Ilgen et al, 2017;Kulkarni et al, 2018;Meng et al, 2017). Redox process of As þ3 , Fe þ2 to As þ5 , and Fe þ3 is expected to be completed in two hours (Leupin and Hug, 2005).…”