Institute of Hydrobiology, Jinan University, Guangzhou 510632, China.
Institute of Hydrobiology, Jinan University, Guangzhou 510632, China; Engineering Research Center of Tropical and Subtropical Aquatic Ecological Engineering, Ministry of Education, Guangzhou, China.
J Hazard Mater. 2017 Oct 5;339:310-319. doi: 10.1016/j.jhazmat.2017.06.026. Epub 2017 Jun 15.
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 Mn concentrations of 6, 30, and 50mgL produced a maximum of 5, 13, and 11mgL of BioMnOx, respectively. Mn-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 Mn decrease during BPA oxidation confirmed Mn oxide regeneration. In conclusion, Mn oxide formation by microalgae has the potential to be used for environmental remediation.
生物成因的锰氧化物（BioMnOx）作为活性氧化剂、吸附剂和催化剂引起了广泛关注。本研究调查了藻类生成的 BioMnOx 的特性，并确定了其对双酚 A（BPA）的氧化活性，BPA 是一种内分泌干扰物。从 WR1 小球藻产生的 BioMnOx 中发现了具有+3 主要锰价态的无定形纳米颗粒。其机制可能是藻类生长通过增加 DO 和 pH 值创造了有利于 Mn 氧化的条件。初始 Mn 浓度为 6、30 和 50mg/L 时，分别产生了最多 5、13 和 11mg/L 的 BioMnOx。富 Mn 培养物表现出最高的 BPA 去除效率（约 78%），而对照仅达到约 27%。BioMnOx 可能会显著促进藻类培养物中 BPA 的氧化，增加糖基化底物的积累。此外，在 BPA 氧化过程中持续增加的 BioMnOx 和减少的 Mn 证实了 Mn 氧化物的再生。总之，微藻形成的 Mn 氧化物有可能用于环境修复。
