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Size- and surface charge-controlled layered double hydroxides for efficient algal flocculation†
Environmental Science: Nano ( IF 7.3 ) Pub Date : 2017-11-28 00:00:00 , DOI: 10.1039/c7en00809k
Tae-Hyun Kim 1, 2, 3, 4, 5 , In Taek Hong 1, 2, 3, 4, 5 , Jae-Min Oh 1, 2, 3, 4, 5
Affiliation  

We evaluated the effects of particle size and surface charge on the algal flocculation activity of layered double hydroxides (LDHs). LDHs with different lateral sizes of 50, 250, and 2000 nm were prepared by adjusting reaction methods and parameters during co-precipitation of a metal solution under alkaline conditions. LDH particles of 2000 nm readily flocculated ∼100% of Microcystis aeruginosa within 60 min, whereas smaller LDHs did not show significant algal flocculation. We controlled the surface charge of 2000 nm LDHs to be highly positive, almost neutral, or negative using organic moiety coatings of L-serine, succinate, and citrate, respectively. Negatively coated LDHs did not flocculate algae, suggesting the importance of surface charge in the algae–LDH interaction. Taking into account the size and surface charge parameters for algal flocculation, we prepared LDHs with a lateral size of ∼500 nm and a positive surface charge from industrial waste slag, a by-product of alloy manufacturing, from an electric arc furnace. These LDHs showed ∼40% flocculating activity within 60 min, whereas the slag ground into powder showed little flocculating activity after 240 min.

中文翻译:

可控制大小和表面电荷的层状双氢氧化物,可实现有效的藻类絮凝

我们评估了粒径和表面电荷对层状双氢氧化物(LDHs)的藻絮凝活性的影响。在碱性条件下,通过调节金属溶液的共沉淀过程中的反应方法和参数,可以制备出具有50、250和2000 nm不同横向尺寸的LDH。2000 nm的LDH粒子在60分钟内容易絮凝〜100%的铜绿微囊藻,而较小的LDH则没有明显的藻类絮凝。我们使用L的有机部分涂层将2000 nm LDH的表面电荷控制为高度正电荷,几乎中性电荷或负电荷-分别为丝氨酸,琥珀酸和柠檬酸。负包被的LDHs不会絮凝藻类,表明表面电荷在藻类与LDH的相互作用中很重要。考虑到藻类絮凝的大小和表面电荷参数,我们从电弧炉中制备了横向尺寸为〜500 nm的LDH,并从工业废渣(合金制造的副产品)中获得了正表面电荷。这些LDH在60分钟内显示约40%的絮凝活性,而磨碎成粉末的矿渣在240分钟后几乎没有絮凝活性。
更新日期:2017-11-28
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