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用于废水处理超滤的低污染纳米结构纤维素膜

Low Fouling Nanostructured Cellulose Membranes for Ultrafiltration in Wastewater Treatment.

作者信息

Joshi Ritika, Sebat Nilay, Chi Kai, Khan Madani, Johnson Ken I, Alhamzani Abdulrahman G, Habib M A, Lindstrom Tom, Hsiao Benjamin S

机构信息

Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, NY 11794, USA.

Department of Chemistry, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia.

出版信息

Membranes (Basel). 2023 Jan 23;13(2):147. doi: 10.3390/membranes13020147.

DOI:10.3390/membranes13020147
PMID:36837650
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9964168/
Abstract

Ultrafiltration (UF) is a common technique used in wastewater treatments. However, the issue of membrane fouling in UF can greatly hinder the effectiveness of the treatments. This study demonstrated a low-fouling composite cellulose membrane system based on microfibrillated cellulose (MFC) and silica nanoparticle additives. The incorporation of 'non-spherical' silica nanoparticles was found to exhibit better structural integration in the membrane (i.e., minimal aggregation of silica nanoparticles in the membrane scaffold) as compared to spherical silica. The resulting composite membranes were tested for UF using local wastewater, where the best-performing membrane exhibited higher permeation flux than commercial polyvinylidene difluoride (PVDF) and polyether sulfone (PES) membranes while maintaining a high separation efficiency (~99.6%) and good flux recovery ratio (>90%). The analysis of the fouling behavior using different models suggested that the processes of cake layer formation and pore-constriction were probably two dominant fouling mechanisms, likely due to the presence of humic substances in wastewater. The demonstrated cellulose composite membrane system showed low-fouling and high restoration capability by a simple hydraulic cleaning method due to the super hydrophilic nature of the cellulose scaffold containing silica nanoparticles.

摘要

超滤（UF）是废水处理中常用的技术。然而，超滤过程中的膜污染问题会极大地阻碍处理效果。本研究展示了一种基于微纤化纤维素（MFC）和二氧化硅纳米颗粒添加剂的低污染复合纤维素膜系统。与球形二氧化硅相比，发现掺入“非球形”二氧化硅纳米颗粒在膜中表现出更好的结构整合性（即二氧化硅纳米颗粒在膜支架中的聚集最小）。使用当地废水对所得复合膜进行超滤测试，性能最佳的膜表现出比商用聚偏二氟乙烯（PVDF）和聚醚砜（PES）膜更高的渗透通量，同时保持高分离效率（约99.6%）和良好的通量恢复率（>90%）。使用不同模型对污染行为的分析表明，滤饼层形成和孔收缩过程可能是两种主要的污染机制，这可能是由于废水中存在腐殖质。由于含二氧化硅纳米颗粒的纤维素支架具有超亲水性，通过简单的水力清洗方法，所展示的纤维素复合膜系统表现出低污染和高恢复能力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bde/9964168/66c2b09ea8b7/membranes-13-00147-g015.jpg
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