Optimization of the use of a biosorbent to remove heavy metals: Regeneration and reuse of exhausted biosorbent

Novel Fe3O4/hydroxyapatite/β‐cyclodextrin nanocomposite adsorbent: Synthesis and application in heavy metal removal from aqueous solution

“…Numerous sorbents such as carbon‐based materials (e.g., activated carbon, carbon nanotubes, and graphene oxides), low‐cost adsorbents (e.g., agricultural wastes, industrial wastes, sea materials like chitosan, and natural materials such as zeolite), and bio‐sorbents have been used for the treatment of wastewater containing heavy metals. Recently, various adsorbents such as biochars, cellulosic adsorbent, magnetic graphene oxide, ferromanganese biochar composites, and chitosan bead have been specifically employed to decontaminate Cu 2+ and Cd 2+ ions from aqueous solutions …”

Absorption Activity of Cassava Peel (Manihot utilissima) as Chromium (VI) Metal Biosorbent in Electroplating Waste

“…Then it was stirred for about (10,20,30, 40, 50) minutes and filtered by whatman filter paper. The 2.5 mL filtrate was diluted in 25 mL measuring cylinder with HNO 3 1%.…”

“…Rapid process of biosorption also initially could be attributed to the availability of more free surface active sites and involvement of mechanisms like ionexchange or physical biosorption at the FMB surface [20]. Once these sites are blocked, the intra-particle diffusion of biosorbate takes place which might be responsible for the slower biosorption process at the later stage [8,13].…”

“…Analysis of heavy metal concentrations of chromium (VI) in electroplating waste was performed by Atomic Absorption Spectrophotometry (AAS) after biosorbtion process. Variation of biosorbent mass were (0.1, 0.2, 0.3, 0.4, 0.5) grams, and variation of biosorbent contact time were (10,20, 30, 40, 50) minutes. The analysis result recorded by AAS (Atomic Absorption Spectrophotometry) showed that the level of total chromium in electroplating waste reaches 2.0777 ± 0.2785 ppm.…”

Optimization of Enhanced Ultrafiltration Conditions for Cd with Mixed Biosurfactants Using the Box-Behnken Response Surface Methodology

“…Cd also harms human health through accumulation in food chains [4,5]. The common treatment methods for heavy metal ions in aqueous solutions include adsorption [6][7][8][9], bio-based methods [10][11][12], membrane separation techniques [13][14][15], electrolysis [16,17] and chemical precipitation [12,18]. Among these, micellar-enhanced ultrafiltration (MEUF), one of the membrane separation techniques, has received recent attention because it has the advantages of low energy consumption, easy operation, high permeation flux and high removal efficiency [1].…”