Efficient removal of Sb(III) from water using β-FeOOH-modified biochar:Synthesis, performance and mechanism. (January 2023)

• Record Type: Journal Article
• Authors: Lai, Ling; Liu, Xitao; Ren, Wenbo; Zhou, Zhou; Zhao, Xiwang; Zeng, Xiaofeng; Lin, Chunye; He, Mengchang; Ouyang, Wei
• Is Part Of: Chemosphere. Volume 311:Part 1(2023)
• Publication Date: 2023-01
• Subjects: β-FeOOH/BC -- Sb(III) -- Adsorption -- Oxidation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.137057
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Since the toxicity of Sb(III) is 10 times as high as that of Sb(V) in the environment, it is urgent to find a way to cut down Sb(III). β-FeOOH-modified biochar (β-FeOOH/BC) was prepared and used to remove Sb(III). The characterization results suggested that oxygen-containing functional groups formed on β-FeOOH/BC, which increased the Sb(III) removal efficiency. Even under complex water matrix conditions, the outstanding adsorption performance of β-FeOOH/BC for Sb(III) was obtained. The adsorption reaction rapidly reached a high removal efficiency within 5 min and approached adsorption equilibrium in about 6 h. The adsorption process was fitted to pseudo-second-order kinetics. Amount of maximum adsorption was 202.53 mg g −1 at 308 K according to Langmuir model. β-FeOOH/BC removed Sb(III) mainly through pore-filling complexation, cation-π and coordination exchange. The CO sites and persistent free radicals (PFRs) acted as electron acceptors, facilitating the electron transfer. In brief, β-FeOOH/BC adsorbent material could adsorb and oxidize Sb(III), which showed excellent prospects for reducing the risk of Sb(III). Graphical abstract: Image 1 Highlights: The adsorbent showed a high adsorption capacity of 202.53 mg g −1 for Sb(III). Adsorption mechanism were pore filling, cation-π bond and ligands exchange. β-FeOOH/BC could reduce Sb(III) toxicity through CO electron transfer.