Improving the wastewater treatment performance of loose nano-filtration membranes using natural clay functionalized with AlFe2O4 nanocleaners

IF 3.1 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Ashok Shrishail Maraddi, Santrupthi Padival, Glenita Bridget D'Souza, Smitha Kamath, Anshu Kumar and S. K. Nataraj
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Abstract

Membranes with the right composition can potentially afford exceptionally high water flux with high contaminant rejection and recovery ratios, prolonged life with anti-fouling capabilities, and low operating costs. In this regard, an innovative AlFe2O4-functionalized bentonite (AlFe2O4@BT) material was prepared as a performance-boosting agent for polyethersulfone (PES)-based mixed-matrix loose nanofiltration membranes (LNMs). Herein, the fabrication of PES-based mixed matrices was achieved by blending AlFe2O4@BT at different wt% values through phase inversion technology. The effects of AlFe2O4@BT on the structure and functionality of the as-prepared AlFe2O4@BT-PES LNMs were thoroughly examined by scanning electron microscopy, contact angle measurements, antifouling measurements and other techniques. The separation efficiency of the AlFe2O4@BT-PES-based LNMs was recorded as 80%, 85% and 95% for crystal violet (CV), Congo Red (CR), and humic acid, respectively, with exceptionally high product flux efficiencies and anti-fouling properties comparable to those of commercial polyamide membranes. The new LNMs operate at relatively low operating pressures (1–4 bar), thus offering sustainable separation processes with lower flux decline ratios and high recovery ratios, demonstrating their superior membrane material combination.

Abstract Image

AlFe2O4纳米净化剂改性天然粘土提高松散纳米过滤膜的废水处理性能
具有合适成分的膜具有极高的水通量、高污染物截留率和回收率、抗污染能力和较长的使用寿命以及较低的运行成本。为此,制备了一种新型的alfe2o4功能化膨润土(AlFe2O4@BT)材料,作为聚醚砜(PES)基混合基质松散纳滤膜(LNMs)的性能增强剂。在此,通过相位反转技术将不同wt%值的AlFe2O4@BT混合在一起,实现了基于pes的混合矩阵的制备。通过扫描电子显微镜、接触角测量、防污测量等技术,全面考察了AlFe2O4@BT对制备的AlFe2O4@BT-PES LNMs结构和功能的影响。AlFe2O4@BT-PES-based LNMs对结晶紫(CV)、刚果红(CR)和腐植酸的分离效率分别为80%、85%和95%,具有极高的产品通量效率和抗污染性能,可与商用聚酰胺膜相媲美。新型LNMs在相对较低的操作压力(1-4 bar)下运行,从而提供具有较低通量下降比和高回收率的可持续分离过程,展示了其优越的膜材料组合。
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来源期刊
Environmental Science: Water Research & Technology
Environmental Science: Water Research & Technology ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES
CiteScore
8.60
自引率
4.00%
发文量
206
期刊介绍: Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.
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