Dolphen R, Thiravetyan P
a Division of Biotechnology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi , Bangkok , 10150 , Thailand.
Int J Phytoremediation. 2015;17(7):686-92. doi: 10.1080/15226514.2014.964839.
Our screening of plants showed that Cyperus alternifolius (Umbrella papyrus) had the highest efficiency removal in real wastewater containing monoethanolamine-higher than Echinodorus cordifolius (Creeping Burrhead), Thalia geniculata (Alligator Flag), Acorus calamus (Sweet Flag), and Dracaena sanderiana (Lucky Bamboo). Therefore, this research studied the degradation of monoethanolamine (MEA), diethanolamine (DEA), and triethanolamine (TEA) by C. alternifolius. Plants could degrade TEA into DEA, then into MEA, and then further into acetic acid. The accumulation of ethanolamines was found mainly in plant stems, which had the highest biomass. This demonstrated that the molecular size is closely related to a diffusion coefficient that affects the removal rate through plant bodies. A smaller molecular weight-MEA (MW = 61.08 g mol(-1))-was taken up the fastest, followed by DEA (MW = 105.14 g mol(-1)) and TEA (MW = 149.19 g mol(-1)), the highest molecular weight. The plants' toxicity when exposed to ethanolamines elucidated that MEA had the highest toxicity, followed by DEA and TEA. In addition, the application of C. alternifolius in monoethanolamine-contaminated wastewater revealed that plant could completely uptake MEA at day 5 from an initial MEA concentration of 18 mM. The result indicated that C. alternifolius has the potential to remove ethanolamines and can be applied to ethanolamine-contaminated wastewater.
我们对植物的筛选表明，在含有单乙醇胺的实际废水中，风车草（伞莎草）的去除效率最高，高于心叶水蕹（匍匐刺头）、竹叶水塔花（水塔花）、菖蒲（香蒲）和富贵竹。因此，本研究探讨了风车草对单乙醇胺（MEA）、二乙醇胺（DEA）和三乙醇胺（TEA）的降解作用。植物可将TEA降解为DEA，再降解为MEA，然后进一步降解为乙酸。乙醇胺的积累主要存在于生物量最高的植物茎中。这表明分子大小与扩散系数密切相关，扩散系数会影响其通过植物体内的去除速率。分子量较小的MEA（MW = 61.08 g mol(-1)）吸收最快，其次是DEA（MW = 105.14 g mol(-1)）和分子量最大的TEA（MW = 149.19 g mol(-1)）。植物接触乙醇胺时的毒性表明，MEA毒性最高，其次是DEA和TEA。此外，将风车草应用于受单乙醇胺污染的废水表明，在初始MEA浓度为18 mM的情况下，植物在第5天可完全吸收MEA。结果表明，风车草具有去除乙醇胺的潜力，可应用于受乙醇胺污染的废水处理。
