The synthesis of an acrylamide copolymer and its synergistic effects on clay flocculation of red tide organisms

Qi Yu; Zhiming Yu; Xiuxian Song; Xihua Cao; Wenbin Jiang; Yanyang Chu

doi:10.1016/j.jenvman.2023.117326

The synthesis of an acrylamide copolymer and its synergistic effects on clay flocculation of red tide organisms

J Environ Manage. 2023 Apr 15:332:117326. doi: 10.1016/j.jenvman.2023.117326. Epub 2023 Feb 8.

Authors

Qi Yu¹, Zhiming Yu², Xiuxian Song², Xihua Cao², Wenbin Jiang³, Yanyang Chu⁴

Affiliations

¹ School of Environment and Safety Engineering, Qingdao University of Science and Technology, Shandong, Qingdao, 266042, China; CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Functional Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China.
² CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Functional Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, 266071, PR China; University of Chinese Academy of Sciences, Beijing, 100049, China.
³ CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Functional Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, 266071, PR China.
⁴ School of Environment and Safety Engineering, Qingdao University of Science and Technology, Shandong, Qingdao, 266042, China.

PMID: 36764213
DOI: 10.1016/j.jenvman.2023.117326

Abstract

The modified clay (MC) method is a common emergency treatment technology for red tides, and the selection of surface modifiers is the key to the MC technology. A cationic polymeric modifier, the copolymer of dimethyl diallyl ammonium chloride and acrylamide (P (DMDAAC-co-AM), PDA) was optimized via a visible-light-induced polymerization technique. The PDA-modified clay (PDAMC) was prepared with strong salt tolerance and achieved efficiencies of 86% at the concentration of 50 mg L^-1, and the dose was 90% lower than that of aluminum polychloride-modified clay (PACMC). While polyacrylamide and commercial PDA can achieve efficiencies of only 25 and 67%, respectively, but high doses were required. This is because PDA changed the surface charges of clay particles from negative to positive, which promotes the formation of the polymer-chains bridging network to overcome the difficulties of curling in seawater. According to the analysis of flocculation parameters and spatial conformation of PDAMC, the high salinity tolerance of the PDAMC was attributed to the synergistic processes of charge neutralization and the three-dimensional network bridging. Therefore, this study has developed a highly effective flocculant material used in seawater and provided an important reference for the management of red tide organisms.

Keywords: Acrylamide copolymers; Clay surface modification; Harmful algal blooms(HABs) organisms; Mitigation; Visible-light-induced polymerization.

MeSH terms

Acrylamide*
Aluminum
Clay
Flocculation
Harmful Algal Bloom*

Substances

Clay
Acrylamide
Aluminum