Efficient removal of Phaeocystis globosa from seawater with the persulfate activation by arbutin-modified cellulose nanocrystals. (February 2023)

• Record Type: Journal Article
• Authors: Che, Mingda; Shan, Cancan; Zhang, Wenjie; Duan, Yanyi; Huang, Renliang; Cui, Mei; Qi, Wei; Su, Rongxin
• Is Part Of: Chemosphere. Volume 313(2023)
• Publication Date: 2023-02
• Subjects: Phaeocystis globosa -- Arbutin -- Cellulose nanocrystals -- Persulfate -- Harmful algal blooms; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.137647
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Harmful algal blooms (HABs) from seawater have a severe threat to human health, aquaculture, and coastal nuclear power safety. Thus, it is highly desirable to explore environmentally friendly, efficient, and economic methods for controlling HABs. Herein, the arbutin-modified cellulose nanocrystals (AT-CNC) activated persulfate (PS), as a novel heterogeneous Fenton-like process, was proposed to remove Phaeocystis globosa ( P. globosa ) from seawater. The AT-CNC was synthesized via the surface modification of AT on CNC. The effects of AT dosage, CNC dosage, and PS dosage on the removal performance of P. globosa were investigated. With the addition of 530 mg/L AT-CNC (6 wt% AT/CNC of AT loading) and 120 mg/L PS, the removal percentage of chlorophyll a ( R c ), optical density at 680 nm ( R o ) and turbidity ( R t ) reached 97.7%, 91.9% and 85.2% at 24 h. According to electron paramagnetic resonance (EPR) spectra and radical quenching tests, the predominant free radicals inactivating P. globosa were hydroxyl radicals ( OH). Additionally, the flocculation of the inactivated algae cells by AT-CNC was also critical for removing P. globosa. Moreover, a positive environmental impact was achieved in the AT–CNC–PS system due to the reduction of nitrogen, phosphorus and organic carbon contents. Based on the excellent removal performance for P. globosa, we believe that the AT-CNC activated persulfate is a promising option for HABs control. Graphical abstract: Image 1 Highlights: Arbutin-modified cellulose nanocrystals for removing P. globosa was prepared. The AT-CNC activated persulfate was developed for the removal of P. globosa. AT-CNC acts as activator for persulfate and flocculant for inactivated algal cells. 97.7% of Chl-a, 91.9% of OD680, and 85.2% of turbidity were reduced at 24 h. OH dominates the inactivation process of P. globosa in the AT–CNC–PS system.