Biogenic manganese oxides generated by green algae Desmodesmus sp. WR1 to improve bisphenol A removal

• Published in: Journal of hazardous materials Vol. 339; pp. 310 - 319
• Main Authors: Wang, Rui, Wang, Sai, Tai, Yiping, Tao, Ran, Dai, Yunv, Guo, Jingjing, Yang, Yang, Duan, Shunshan
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 05.10.2017
• Subjects: Benzhydryl Compounds - chemistry; Biogenic manganese oxide; Bisphenol A; Chlorophyta - drug effects; Chlorophyta - metabolism; Desmodesmus sp. WR1; Environmental Restoration and Remediation; Manganese - pharmacology; Manganese Compounds - chemistry; Manganese Compounds - metabolism; Microalgae - drug effects; Microalgae - metabolism; Oxidation-Reduction; Oxidative degradation; Oxides - chemistry; Oxides - metabolism; Phenols - chemistry; Regeneration; Water Pollutants, Chemical - chemistry; Bisphenol A; Regeneration; Desmodesmus sp. WR1; Biogenic manganese oxide; Oxidative degradation
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2017.06.026

•Alkalinity and manganese enrichment enhanced BioMnOx generation by algae.•BioMnOx may significantly promote BPA oxidation.•Mn oxide regeneration by Desmodesmus sp.WR1 was confirmed.•Mn oxide formation by microalgae may be useful in environmental remediation. Biogenic manganese oxides (BioMnOx) have attracted considerable attention as active oxidants, adsorbents, and catalysts. This study investigated the characteristics of algae-generated BioMnOx and determined its oxidative activity towards bisphenol A (BPA), an endocrine disrupter. Amorphous nanoparticles with a primary Mn valency of +3 were found in BioMnOx produced by Desmodesmus sp. WR1. The mechanism might be that algal growth created conditions favorable to Mn oxidation through increasing DO and pH. Initial Mn2+ concentrations of 6, 30, and 50mgL−1 produced a maximum of 5, 13, and 11mgL−1 of BioMnOx, respectively. Mn2+-enriched cultures exhibited the highest BPA removal efficiency (∼78%), while controls only reached about 27%. BioMnOx may significantly promote BPA oxidation in algae culture, enhancing the accumulation of substrates for glycosylation. Moreover, continuous BioMnOx increase and Mn2+ decrease during BPA oxidation confirmed Mn oxide regeneration. In conclusion, Mn oxide formation by microalgae has the potential to be used for environmental remediation.