Fouling-free ultrafiltration for humic acid removal

Younas, Hassan; Shao, Jiahui; He, Yiliang; Fatima, Gul; Jaffar, Syed Taseer Abbas; Afridi, Zohaib Ur Rehman

doi:10.1039/c8ra03810d

Cited by 13 publications

(4 citation statements)

References 56 publications

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“…The enhanced water flux under UV light is attributed to photoinduced hydrophilicity activated by UV light on TiO2, as supported by previous studies. [40][41].…”

Section: 2) Surface Morphology Propertiesmentioning

confidence: 99%

Monitoring of Estrone from Hospital Wastewater and its Removal by Photocatalytic Membrane Reactor

Karnjanamit,

Thammakhet-Buranachai,

Jutaporn

et al. 2024

App. Envi. Res.

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Steroid hormones, classified as endocrine-disrupting compounds (EDCs), pose significant environmental and health concerns due to their persistence and potential adverse effects. This study investigates the presence of estrone (E1) in hospital wastewater and the efficiency of E1 removal through a photocatalytic membrane reactor (PMR). Wastewater samples were collected from two hospitals with different wastewater treatment processes. The concentration of E1 was analyzed using a combination of solid phase extraction (SPE) and liquid chromatography-tandem mass spectrometry (LC-MS/MS). The PMR experimental setup involved a polyvinylidene fluoride (PVDF) membrane incorporated with 1 wt% titanium dioxide (PVDF/TiO2). The PMR performance was evaluated with and without UVC radiation. The membranes were characterized for their water contact angle (WCA) and surface morphology. The maximum concentration of E1 in the hospital wastewater was 2.46 ± 1.90 ng L-1. The PMR, operated for 180 min, demonstrated that PVDF/TiO2 (UV) exhibited the highest E1 removal efficiency (96.7 ± 1.4%). This superior performance was attributed to the synergistic effect of PVDF/TiO2 membrane filtration combined with UV irradiation, enhancing the removal capacity. The removal of E1 in the PVDF/TiO2 membrane (36.5 ± 2.7%) surpassed that of the PVDF membrane (32.6 ± 7.8%). The kinetics analysis indicated that the degradation of E1 followed pseudo first-order kinetics. These findings underscore the potential of PMR technology, specifically employing PVDF/TiO2 membranes with UV irradiation, for efficient removal of E1 from hospital wastewater, offering insights for future applications in mitigating micropollutant release into the environment.

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“…The enhanced water flux under UV light is attributed to photoinduced hydrophilicity activated by UV light on TiO2, as supported by previous studies. [40][41].…”

Section: 2) Surface Morphology Propertiesmentioning

confidence: 99%

Monitoring of Estrone from Hospital Wastewater and its Removal by Photocatalytic Membrane Reactor

Karnjanamit,

Thammakhet-Buranachai,

Jutaporn

et al. 2024

App. Envi. Res.

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“…Since the high pure water flux value means that the material completes the purification of high volumes in a shorter time, the membrane can be used as a measure of the suitability of alternative materials and the relative performance between them. 47,48 Pure water flux analysis of pure PLA, Pure PSU, and PSU/PLA blends was performed. Since the pure PLA solution is highly viscous, clumping occurred when it was immersed in the coagulation bath after filming.…”

Section: Pure Water Fluxes Of the Membranesmentioning

confidence: 99%

Hydrophilicity and flux properties improvement of high performance polysulfone membranes via sulfonation and blending with Poly(lactic acid)

Tasci

Kaya

Celebi

2022

High Performance Polymers

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To achieve increased flow and reduce fouling, polymeric membranes can be functionalized with hydrophilic groups such as sulfone, amines, and others. This research has aimed at the sulfonation of Polysulfone (PSU) with various agents and at varying substitution degrees to change its hydrophobic character. PSU was also blended with Poly(lactic acid) (PLA), which is a more hydrophilic polymer. The phase inversion method was used to make PSU, PLA, sulfonated PSU, and PSU/PLA blend-based membranes. Sulfonation degrees of sulfonated PSU membranes were assessed using FT-IR, mechanical characteristics of membranes were determined, and thermal properties of membranes were clarified using DSC and TGA techniques. Hydrophilic natures and membrane alterations were investigated, as well as contact angle and water uptake measures. Among three distinct sulfonation agents (trimethylsilyl chlorosulfonate (TMSCS), sulfuric acid, and chlorosulfonic acid) employed to produce a 20% sulfonation degree of polysulfone, TMSCS was chosen as having the highest sulfonation efficiency (91.5%). With increasing sulfonation degree, a drop in molecular weight was seen in all sulfonated polysulfone samples. The mechanical strength values of polysulfone after sulfonation with TMSCS rose from 35.23 MPa to 63.35 MPa, while the contact angle value decreased from 85.58° to 71°. The contact angle value reduced from 85.58° to 64.68° while the mechanical strength of the PSU and PSU/PLA (50:50) blend increased from 35.23 MPa to 39.3 MPa. Membranes were also tested for pure water flux, hydrostability, and biostability. In terms of application requirements, it was determined that sulfonated PSU-based membranes manufactured with TMSCS with a 20% sulfonation degree and PSU/PLA blend-based membranes with a 50:50 (w:w) ratio have the optimum compositions with high flux quantities.

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“…To enhance the efficiency of membrane desalination, researchers often explore various factors, including membrane materials, operating conditions, and influent conditions [21]. Pretreatment, backwashing, membrane surface modification, and chemical treatment are commonly studied approaches in this regard [22][23][24]. However, such methods may bring additional costs, secondary pollution, and potential physical damage to the membrane structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electric Field on Membrane Fouling and Membrane Performance in Reverse Osmosis Treatment of Brackish Water

Fu,

Yi,

Gao

2024

Applied Sciences

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One of the most important applied technologies in water treatment is reverse osmosis (RO). However, membrane fouling and flux reduction pose significant challenges. The electric field, as an effective preventive measure, has received limited attention in RO applications. In this study, we added electric fields to finished rolled RO membranes to investigate their effect on membrane fouling and desalination performance. Experimental results indicated that higher electric fields were associated with higher concentrations of treated brine, resulting in a more significant effect. Permeate flux ratios increased with increasing voltage, with peaks of 1.02% (1000 mg/L, 25 V), 1.23% (2000 mg/L, 25 V), and 1.37% (3000 mg/L, 25 V), respectively. Additionally, the maximum reduction in the specific energy consumption (SEC) was 31% (2000 mg/L, 25 V) and 59% (3000 mg/L, 25 V), respectively. Notably, electric fields had a retarding effect on Ca2+ and humic acid (HA) fouling, with a stronger effect on HA, and higher permeate flux was maintained even after 120 h of operation. While this study visually demonstrates the direct effect of electric fields on RO, further quantification of the economic benefits of this method and a comprehensive understanding of the mechanisms behind how the electric field enhances permeate flux and mitigates membrane fouling are needed.

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Fouling-free ultrafiltration for humic acid removal

Cited by 13 publications

References 56 publications

Monitoring of Estrone from Hospital Wastewater and its Removal by Photocatalytic Membrane Reactor

Monitoring of Estrone from Hospital Wastewater and its Removal by Photocatalytic Membrane Reactor

Hydrophilicity and flux properties improvement of high performance polysulfone membranes via sulfonation and blending with Poly(lactic acid)

Effect of Electric Field on Membrane Fouling and Membrane Performance in Reverse Osmosis Treatment of Brackish Water

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