One-step removal of harmful algal blooms by dual-functional flocculant based on self-branched chitosan integrated with flotation function

Min Zhao Lin, Wei Xiong Li, Tian Hu, Huaitian Bu, Zeng Lin Li, Tianfu Wu, Xia Xiao Wu, Chao Sun, Yongtao Li, Gang Biao Jiang

Research output: Contribution to journalArticle

Abstract

Harmful algal blooms induce severe environmental problems. It is challenging to remove algae by the current available treatments involving complicate process and costly instruments. Here, we developed a CaO2@PEG-loaded water-soluble self-branched chitosan (CP-SBC) system, which can remove algae from water in one-step without additional instrumentation. This approach utilizes a novel flocculant (self-branched chitosan) integrated with flotation function (induced by CaO2@PEG). CP-SBC exhibited better flocculation performance than commercial flocculants, which is attributed to the enhanced bridging and sweeping effect of branched chitosan. CP-SBC demonstrated outstanding biocompatibility, which was verified by zebrafish test and algae activity test. CaO2@PEG-loaded self-branched chitosan can serve as an “Air flotation system” to spontaneous float the flocs after flocculation by sustainably released O2. Furthermore, CP-SBC can improve water quality through minimizing dissolved oxygen depletion and reducing total phosphorus concentrations.

Original languageEnglish (US)
Article number117710
JournalCarbohydrate Polymers
Volume259
DOIs
StatePublished - May 1 2021

Keywords

  • Dual-functional flocculant
  • Environment-friendly technology
  • Flocculation
  • Harmful algal blooms (HABs)
  • Natural polymer

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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