Fabrication of amino-modified electrospun nanofibrous cellulose membrane and adsorption for typical organoarsenic contaminants: Behavior and mechanism

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2020-02, Vol.382, p.122775, Article 122775
• Main Authors: Liu, Kaiyang, Huang, Zhongyuan, Dai, Jinlan, Jiang, Yanting, Yang, Guifang, Liu, Yifan, Lin, Chunxiang, Lv, Yuancai, Liu, Minghua
• Format: Article
• Language: English
• Subjects: Adsorption; Amino-modification; Cellulose; Mechanism; Organoarsenic compounds
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2019.122775

[Display omitted] •Amino-modified cellulose membrane (CA-PVAm) was prepared.•CA-PVAm was employed for adsorption of three typical organoarsenic contaminants.•Adsorption isotherms, thermodynamics, kinetics and reusability were studied.•Plausible adsorption mechanism were further discussed. Herein, an amino-modified electrospun nanofibrous cellulose membrane (CA-PVAm) was prepared and employed to adsorb the typical organoarsenic contaminants (roxarsone (ROX), p-arsanilic acid (p-ASA), and phenylarsonic acid (PAA)). The SEM, FT-IR, and XPS results showed that the CA-PVAm composed of abundant nanofibres and owned ample functional groups such as NH2, OH, and CO groups. The batch experiments demonstrated that the CA-PVAm exhibited excellent adsorption performance on ROX (186.22 mg g−1), p-ASA (69.15 mg g−1), and PAA (62.77 mg g−1), which were 15.98, 6.83, and 6.25 folds larger than those of the pristine CA. In addition, the adsorption process of ROX, p-ASA, and PAA on CA-PVAm accorded with the Langmuir model and obeyed the pseudo-second-order model with intraparticle diffusion. Meanwhile, the adsorption of ROX and PAA was endothermic process, but the exothermic process was observed during the p-ASA adsorption. Furthermore, the main adsorption mechanisms involved electrostatic interactions and hydrogen-bonding interactions. The formed stable six-membered structure between NH2 and NO2 groups could significantly enhance the hydrogen-bonding interactions between CA-PVAm and ROX molecule, resulting in evident improvement in ROX adsorption. Importantly, the CA-PVAm displayed outstanding reusability (4 cycles) and rapid desorption rate. This study probably provides an important theoretical and experimental basis for the remediation of the emerging organic pollutants.