Fabrication of poly(vinyl alcohol)/sodium alginate hydrogel beads and its application in photo-Fenton degradation of tet
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Fabrication of poly(vinyl alcohol)/sodium alginate hydrogel beads and its application in photo-Fenton degradation of tetracycline Zoufei Du1, Fei Liu1, Changfa Xiao1, Yi Dan1,*, and Long Jiang1,* 1
State Key Laboratory of Polymer Materials Engineering of China (Sichuan University), Polymer Research Institute of Sichuan University, Chengdu 610065, China
Received: 2 April 2020
ABSTRACT
Accepted: 16 August 2020
Developing a reusable and durable catalyst for heterogeneous photo-Fenton process is of great importance for the practical application in the environment remediation. In this study, poly(vinyl alcohol) (PVA)/sodium alginate (SA) hydrogel beads were constructed using FeCl3 and boric acid as cross-linking agents. Characterizations and tests were employed to investigate the structure, optical property and durability of the obtained beads. The photo-Fenton performance of the PVA/SA-FeCl3 beads was evaluated by degradation of tetracycline (TC) under visible-light irradiation. The results show that the constructed beads exhibit porous structure, display a broad absorption band in the visible region and behave excellent stability against mechanic effects. The photocatalytic experiment result indicates that the removal rate of TC reaches 90.5% under optimized conditions, while the removal rate of total organic carbon reaches 28.6%. By analyzing the degradation of TC after adding active species scavengers, a photocatalytic mechanism was proposed. Moreover, PVA/SA-6% FeCl3 beads could be easily separated and recycled in water purification. This work provides a facile and robust method to construct reusable and durable Fe(III)-containing hydrogel beads with acceptable photoFenton catalytic performance under visible-light irradiation, paving the way for its practical application in wastewater treatment.
Published online: 8 October 2020
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Gregory Rutledge.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05299-7
914 Introduction Antibiotics are increasingly used in the aquiculture, medical and livestock industry because of their broad-spectrum antimicrobial activity and low cost [1–3]. In China, approximately 2.1 9 105 tons of antibiotics is produced every year, 85% of which is utilized in the field of the medicine and animal agriculture [4]. Previous studies have revealed that a number of antibiotics have quite long half-lives in the environment [5] and therefore accumulate in vegetables [6], fruits [7], meals and even human body tissues [8, 9] when exposing to the antibiotics-containing wastewater, resulting in growing hazards to human health. Thus, practical solutions for antibiotic or organic pollutants removal are urgently needed [10, 11]. Although various techniques including sedimentation [12], adsorption [13, 14] and biodegradation [15] have been developed to remove antibiotics from wastewater, Fenton- and Fenton-like advanced oxidation technology is considered as
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