藻类絮体生长和结构的光散射研究:明矾与植物衍生聚合物絮凝剂。

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL Soft Matter Pub Date : 2024-11-06 DOI:10.1039/d4sm00837e
Temitope Orimolade, Ngoc-Tram Le, Lyle Trimble, Bandaru Ramarao, Sitaraman Krishnan
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引用次数: 0

摘要

通过光散射和分形分析,对使用明矾和油橄榄种子水提取物作为絮凝剂的铜绿微囊藻培养物的絮凝动力学进行了分析。在连续搅拌的铜绿微囊藻悬浮液中,细胞密度从 200 μg L-1 到 800 μg L-1 叶绿素 a(Chl a)不等,絮凝体的生长在分形维度(dF)相对于絮凝体大小的演变中表现出不同的模式:平滑的单调增长;随机增长;稳定或平缓。明矾(0.1 至 0.4 g L-1)诱导快速扩散限制絮凝,最初产生较低的 dF 值,由于结构重排,dF 值以较慢的速度逐渐增加。相反,在足够高的浓度下(0.1 至 0.2 g L-1 BSA 当量),油橄榄种子蛋白在早期就能促进稳定的高 dF 值≈2.0,这显然是通过贴片电荷相互作用实现的。用明矾形成的絮凝体容易在剪切力的作用下破碎,从而限制了絮凝体的大小和稳定性,而油橄榄种子提取物则能产生更大、更稳定的絮凝体,并且由于聚合物形成了强大的颗粒网络,因此具有更强的抗剪切力。两种絮凝剂都能有效处理 800 μg L-1 Chl a 铜绿微囊藻悬浮液,但在质量浓度相似的情况下,M. oleifera 提取物在絮凝体大小方面表现更好。这些发现凸显了辣木籽提取物作为明矾等传统絮凝剂的一种可持续且有效的替代品的潜力,并对其在絮凝过程中的机理和性能提供了深入的见解。
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Light scattering study of algal floc growth and structure: alum vs. polymeric plant-derived flocculant.

The flocculation dynamics of Microcystis aeruginosa algal cultures using alum and aqueous Moringa oleifera seed extracts as flocculants were analyzed through light scattering and fractal analysis. Floc growth in continuously stirred M. aeruginosa suspensions, with cell densities ranging from 200 to 800 μg L-1 chlorophyll a (Chl a), exhibited distinct patterns in fractal dimension (dF) evolution relative to floc size: a smooth, monotonic increase; stochastic increase; and stabilization or leveling off. dF values ranged from 1.3 to 2.6, with floc diameters (D4,3 volume-weighted mean) spanning 30 to 300 μm. Alum (0.1 to 0.4 g L-1) induced fast diffusion-limited flocculation, initially producing lower dF values, which progressively increased due to structural rearrangement at a slower rate. In contrast, at sufficiently high concentrations (0.1 to 0.2 g L-1 BSA equivalent), M. oleifera seed proteins facilitated stable, high dF ≈ 2.0 early on, evidently through patch charge interactions. Flocs formed with alum were prone to shear-induced breakage, limiting both their size and stability, whereas M. oleifera extract produced larger, more stable flocs with greater resilience to shear due to robust particle network formation by the polymer. Both flocculants effectively treated 800 μg L-1 Chl a M. aeruginosa suspensions, but M. oleifera extract demonstrated better performance in terms of floc size at similar mass concentrations. These findings highlight the potential of Moringa seed extract as a sustainable and effective alternative to conventional flocculants like alum, offering insights into their mechanisms and performance in flocculation processes.

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来源期刊
Soft Matter
Soft Matter 工程技术-材料科学:综合
CiteScore
6.00
自引率
5.90%
发文量
891
审稿时长
1.9 months
期刊介绍: Where physics meets chemistry meets biology for fundamental soft matter research.
期刊最新文献
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