期刊
CHEMICAL ENGINEERING JOURNAL
卷 430, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133077
关键词
Aerogel composite; Photocatalytic degradation; Tetracycline; Methylene blue; Montmorillonite; UV-irradiation
资金
- UC Davis superfund project [NIEHS 5P42ES004699]
- University of California Agriculture and Natural Resources (UC ANR)
- Department of Parks and Recreation, Division of Boating and Waterways, Sacramento
A flexible and recyclable metal-free photodynamic aerogel composite, MCC/MT-MB, has been synthesized without the use of chemical modifiers, showing 97% tetracycline removal efficiency within 120 min. The aerogel utilizes montmorillonite particles hosting methylene blue as adsorbent and photocatalyst, playing a main role in tetracycline adsorption and photodegradation by the Type II photoexitation mechanism.
A flexible and recyclable metal-free photodynamic aerogel composite was synthesized by simple entrapping montmorillonite particles hosting methylene blue (MT-MB) into microcrystalline cellulose aerogel (MCC/MTMB) without the use of chemical modifiers. The MT-MB particles act as adsorbent and photocatalyst for tetracycline for the first time. The mechanism of tetracycline adsorption and photodegradation by MCC/MT-MB aerogel was investigated by confocal imaging and radical scavenger experiment. Singlet oxygen was found to play a main role in the degradation confirming Type II photoexitation mechanism. The MCC/MT-MB aerogel exhibited 97% tetracycline removal efficiency within 120 min. This enhanced performance of the aerogels could be an integrated result of interconnected open porous aerogel structure, multi-adsorption mechanisms of the pollutant on the aerogel, and degradation and direct contact of methylene blue with tetracycline. Furthermore, MCC/MT-MB aerogel showed high stability and photocatalytic degradation recyclability upto 10 cycles of uses, and the recycling process was environmentally friendly. The degradation intermediate products were analyzed by HPLC-MS, and two photodegradation pathways were proposed. In addition, MCC/MT-MB aerogel showed tetracycline removal rate of 90% under red-light irradiation and > 90% under UVA or daylight irradiation from dairy manure samples collected from Central Valley California, USA, respectively. These results confirmed the advantageous functions and practicality of the photoactive porous aerogel in wastewater treatments.
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