Xiaoge Wu (Author), Su Yang (Author), Wenshu Li (Author), JuanJuan Wang (Author), Matevž Dular (Author), Xiao Tan (Author)

Abstract

Traditional methods for algae removal in drinking water treatment, such as coagulation and sedimentation, face challenges due to the negative charge on algae cells’ surfaces, resulting in ineffective removal. Ultrasonic cavitation has shown promise in enhancing coagulation performance by disrupting extracellular polymer structures and improving cyanobacteria removal through various mechanisms like shear force and free radical reactions. However, the short lifespan and limited mass transfer distance of free radicals in conventional ultrasonic treatment lead to high energy consumption, limiting widespread application. To overcome these limitations and enhance energy efficiency, advanced carbon-based materials were developed and tested. Nitrogen-doped functional groups on nanodiamond surfaces were found to boost sonosensitivity by increasing the production of reactive oxygen species at the sonosensitizer-water interface. Utilizing low-power ultrasound (0.12 W/mL) in combination with N-ND treatment for 5 min, removal rates of Microcystis aeruginosa cells in water exceeded 90 %, with enhanced removal of algal organic matters and microcystins in water. Visualization through confocal microscopy highlighted the role of positively charged nitrogen-doped nanodiamonds in aggregating algae cells. The synergy between cell capturing and catalysis of N-ND indicates that efficient mass transfer of free radicals from the sonosensitizer’s surface to the microalgae’s surface is critical for promoting cyanobacteria floc formation. This study underscores the potential of employing a low-intensity ultrasound and N-ND system in effectively improving algae removal in water treatment processes.

Keywords

ultrasound;sonochemistry;nanodiamonds;free radicals;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 544.57
COBISS: 202737411 Link will open in a new window
ISSN: 1350-4177
Views: 14
Downloads: 0
Average score: 0 (0 votes)
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Other data

Secondary language: Slovenian
Secondary keywords: ultrazvok;sonokemija;nanodiamanti;prosti radikali;
Type (COBISS): Article
Pages: str. 1-14
Issue: ǂVol. ǂ109, [articel no.] 106993
Chronology: Oct. 2024
DOI: 10.1016/j.ultsonch.2024.106993
ID: 24592788
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