零价铁去除水中藻蓝蛋白的效率和机制。
Removal efficiency and mechanism of phycocyanin in water by zero-valent iron.
机构信息
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
College of Environment, Hohai University, Nanjing 210098, China.
出版信息
Chemosphere. 2019 Mar;218:402-411. doi: 10.1016/j.chemosphere.2018.11.101. Epub 2018 Nov 19.
The efficiencies and mechanism of phycocyanin removal from water by zero-valent iron (ZVI) were studied. The trend for dissolved organic nitrogen removal was similar to phycocyanin and the removal efficiency was high at ∼81% and 95%, respectively, in 90 min. The experimental results showed that the phycocyanin removal efficiency was higher at pH < 6, with an almost complete removal. However, only 68% was removed at pH 9. Within 30 min, the removal efficiency of phycocyanin for 1-4 tested cycles was reduced from 55.8% to 15.2%. Scanning electron microscopy and energy dispersive spectroscopy, Fourier transform infrared spectroscopy analysis and X-ray photoelectron spectroscopy were used to analyze the mechanisms of phycocyanin removal, which indicated that a small amount of phycocyanin was immobilized on the ZVI surface by adsorption. In addition, the main removal pathway was coagulation by dissolved iron ions. The Fe oxide formed in situ from ZVI had a higher removal efficiency than that in FeCl, which can play improved roles in charge neutralization. The production of disinfection byproducts also decreased because of the decrease of precursors.
研究了零价铁 (ZVI) 从水中去除藻蓝蛋白的效率和机制。溶解有机氮的去除趋势与藻蓝蛋白相似，分别在 90 分钟内达到约 81%和 95%的高去除效率。实验结果表明，在 pH < 6 时藻蓝蛋白的去除效率更高，几乎可以完全去除。然而，在 pH 9 时仅去除了 68%。在 30 分钟内，经过 1-4 次测试循环，藻蓝蛋白的去除效率从 55.8%降低到 15.2%。扫描电子显微镜和能谱分析、傅里叶变换红外光谱分析和 X 射线光电子能谱分析用于分析藻蓝蛋白去除的机制，表明少量藻蓝蛋白通过吸附固定在 ZVI 表面。此外，主要的去除途径是溶解铁离子的混凝。ZVI 原位形成的 Fe 氧化物比 FeCl 的去除效率更高，因为其在电荷中和方面发挥了更好的作用。由于前体的减少，消毒副产物的生成也减少了。
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