Efficiency of a novel nitrogen-doped Fe3O4 impregnated biochar (N/Fe3O4@BC) for arsenic (III and V) removal from aqueous solution: Insight into mechanistic understanding and reusability potential

生物炭 化学 砷酸盐 吸附 水溶液 吸附 朗缪尔吸附模型 磁铁矿 亚砷酸盐 傅里叶变换红外光谱 核化学 无机化学 化学工程 有机化学 冶金 材料科学 工程类 热解
作者
Hamid Ali,Saeed Ahmed,Abdelghani Hsini,Simon Kizito,Yassine Naciri,Ridha Djellabi‬‬‬‬‬‬‬‬,Muhammad Abid,Waseem Raza,Noor Hassan,Muhammad Saif Ur Rehman,Asif Jamal Khan,Muhammad Azhar Khan,Muhammad Zia Ul Haq,Dominic Aboagye,Muhammad Irshad,Munawar Hassan,Asif Hayat,Bo Wu,Abdul Qadeer,Zeeshan Ajmal
出处
期刊:Arabian Journal of Chemistry [Elsevier BV]
卷期号:15 (11): 104209-104209 被引量:36
标识
DOI:10.1016/j.arabjc.2022.104209
摘要

Worldwide, arsenic contamination has become a matter of extreme importance owing to its potential toxic, carcinogenic and mutagenic impact on human health and the environment. The magnetite-loaded biochar has received increasing attention for the removal of arsenic (As) in contaminated water and soil. The present study reports a facile synthesis, characterization and adsorption characteristics of a novel magnetite impregnated nitrogen-doped hybrid biochar (N/Fe3O4@BC) for efficient arsenate, As(V) and arsenite, As(III) removal from aqueous environment. The as-synthesized material (N/Fe3O4@BC) characterization via XRD, BET, FTIR, SEM/EDS clearly revealed magnetite (Fe3O4) impregnation onto biochar matrix. Furthermore, the adsorbent (N/Fe3O4@BC) selectivity results showed that such a combination plays an important role in targeted molecule removal from aqueous environments and compensates for the reduced surface area. The maximum monolayer adsorption (Qmax) of developed adsorbent (N/Fe3O4@BC) (18.15 mg/g and 9.87 mg/g) was significantly higher than that of pristine biochar (BC) (9.89 & 8.12 mg/g) and magnetite nano-particles (MNPs) [7.38 & 8.56 mg/g] for both As(III) and As(V), respectively. Isotherm and kinetic data were well fitted by Langmuir (R2 = 0.993) and Pseudo first order model (R2 = 0.992) thereby indicating physico-chemical sorption as a rate-limiting step. The co-anions (PO43-) effect was more significant for both As(III) and As (V) removal owing to similar outer electronic structure. Mechanistic insights (pH and FTIR spectra) further demonstrated the remarkable contribution of surface groups (OH–, –NH2 and –COOH), electrostatic attraction (via H- bonds), surface complexation and ion exchange followed by external mass transfer diffusion and As(III) oxidation into As(V) by (N/Fe3O4@BC) reactive oxygen species. Moreover, successful desorption was achieved at varying rates up to 7th regeneration cycle thereby showing (N/Fe3O4@BC) potential practical application. Thus, this work provides a novel insight for the fabrication of novel magnetic biochar for As removal from contaminated water in natural, engineering and environmental settings.
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