Effectively remove p-arsanilic acid from water over amphiphilic amino modified collagen fiber

• Published in: Chemosphere (Oxford) Vol. 288; no. Pt 2; p. 132542
• Main Authors: Ye, Xiaoxia, Lin, Huiting, Chi, Ruiyang, Guo, Zhixuan, Lv, Yuancai, Lin, Chunxiang, Liu, Yifan, Luo, Wei
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.02.2022
• Subjects: Amphiphilicity; Arsanilic Acid; Capillary drainage; Collagen; Collagen fiber; Continuous separation; Humans; p-arsanilic acid; Water; Amphiphilicity; p-arsanilic acid; Collagen fiber; Capillary drainage; Continuous separation
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2021.132542

Efficient and rapid removal of p-arsanilic acid (p-ASA) in water is very important in environmental protection and human health, however it is still a severe challenge in actual engineering. Herein, a novel sorbent (CF-PEI) was successfully fabricated by simply modifying the amphiphilic skin collagen fiber (CF) substrate with Polyethylenimine (PEI). The as-prepared CF-PEI exhibits high-efficiency adsorption for negatively charged p-ASA with aromatic rings due to the introduction of amino groups and the existence of hydrophobic bands, and the maximum adsorption capacity of CF-PEI for p-ASA was high up to 285.71 mg g−1. In addition, the adsorption mechanism of CF-PEI on p-ASA mainly includes electrostatic interaction, hydrogen bond and amphiphilicity. The multi-level all-fiber structure of CF makes it mainly focus on surface mass transfer with short mass transfer distance, and its capillary drainage effect can realize large flow and rapid separation. CF-PEI based on CF can realize the ability to separate low-concentration p-ASA with high flow rate and high efficiency. The effective processing volume was 12.5 L g−1 when the separation flux reached as high as 9931.27 L m−2 h−1. Notably, the p-ASA adsorbed on CF-PEI was almost completely eluted by NaOH (0.5 mol L−1). The adsorbent is convenient to prepare, recyclable, high in efficiency, and has a great application prospect in removing organic micro-pollutants. [Display omitted] •A novel amphiphilic adsorbent was prepared from collagen fiber.•The negative charge and rigidity of p-ASA enhanced efficient adsorption on CF-PEI.•The short mass transfer distance of CF accelerates the mass transfer speed.•CF-PEI separated low concentration p-ASA with high flow rate and high efficiency.