Silver nanoparticles (AgNPs) pose serious health risks to humans as the adsorption between AgNPs and humic acid (HA) makes it difficult to remove them from surface water. To solve this problem, polysaccharides extracted from a marine alga, (denoted as Ep), were used to eliminate the AgNP-HA composite contaminant a coagulation-ultrafiltration (C-UF) process. The structure of Ep, AgNP-HA removal mechanism and membrane fouling were analyzed. The results indicated that the backbone of Ep was composed of (1 → 4)-linked l-rhamnopyranose, (1 → 4)-linked d-xylose and (1 → 4)-linked glucuronic acid. With the charge neutralization of PAC hydrolysates and the bridging-sweep role of Ep, AgNPs could be removed completely by the C-UF process. The coagulation performance and membrane flux were the highest when the PAC and Ep dosages were 2.0 mg L and 0.3 mg L, respectively. In addition, when Ep was applied in the C-UF process, the flocs exhibited larger sizes, faster growth rates, better recovery ability and looser structures, which resulted in lower cake resistance and less pore blocking of the UF membrane. Consequently, the membrane flux could be improved by about 25-30% due to the addition of Ep.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9052882 | PMC |
| http://dx.doi.org/10.1039/d0ra02869j | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
New insights into membrane fouling in coagulation-ultrafiltration by cake characteristics analysis: A case study with PACl-Al and PACl.
J Environ Sci (China)
December 2024
Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Membrane fouling is a bottleneck issue that hindered the further application of ultrafiltration technology. To alleviate membrane fouling, coagulation-ultrafiltration (C-UF) process using polyaluminum chloride (PACl) and PACl-Al with high proportion of AlO(OH) as coagulants, respectively, were investigated at various pH conditions. Results indicated that an increase in solution pH contributed to larger floc size and looser floc structure for both PACl and PACl-Al.
View Article and Find Full Text PDFApplication of laminarin as a novel coagulant aid to improve coagulation-ultrafiltration efficiency.
Environ Res
July 2023
School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221000, China. Electronic address:
Polyacrylamide (PAM) is the most commonly used coagulant aid in coagulation-ultrafiltration (C-UF) systems; however, its hydrolyzed monomer is harmful to the human nervous system. In this study, laminarin (LA), was extracted from Laminaria japonica and used as a novel coagulant aid to improve coagulation efficiency and reduce membrane fouling during the C-UF process. Optimal LA usage conditions were systematically examined and compared with those of PAM to evaluate their potential for industrial applications.
View Article and Find Full Text PDFMolecular insights into membrane fouling caused by polysaccharides with different structures in polyaluminum chloride coagulation-ultrafiltration process.
Chemosphere
November 2022
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, MOE), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian, 116024, China. Electronic address:
Article Synopsis
- The study investigates how different polysaccharides, carrageenan (straight chain) and xanthan gum (branched chain), foul membranes during the coagulation-ultrafiltration (C-UF) process using polyaluminum chloride (PACl).
- Filtration experiments revealed that carrageenan showed a consistent pattern of specific filtration resistance (SFR) decrease, while xanthan gum demonstrated a more complex reduction pattern due to their structural differences.
- The findings suggest that the interaction between aluminum and the specific structural features of these polysaccharides under varying PACl concentrations is key to understanding and optimizing membrane fouling in water treatment processes.
A modified coagulation-ultrafiltration process for silver nanoparticles removal and membrane fouling mitigation: The role of laminarin.
Int J Biol Macromol
March 2021
School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China. Electronic address:
Silver nanoparticles (AgNPs) in surface water are highly toxic to humans and difficult to remove due to their adsorption to humic acid (HA). In this study, laminarin (LA) was used as a coagulant aid in a coagulation-ultrafiltration (C-UF) system to improve AgNPs-HA removal efficiency. C-UF efficiency, membrane flux, and flocs properties were investigated to explore the AgNPs-HA removal mechanism and membrane fouling.
View Article and Find Full Text PDFInfluence of Processing Temperature on Membrane Performance and Characteristics of Process Streams Generated during Ultrafiltration of Skim Milk.
Foods
November 2020
School of Food and Nutritional Sciences, University College Cork, T12 TP07 Cork, Ireland.
The effects of processing temperature on filtration performance and characteristics of retentates and permeates produced during ultrafiltration (UF) of skim milk at 5, 20, and 50 °C were investigated. The results indicate that despite higher flux at 50 °C, UF under these conditions resulted in greater fouling and rapid flux decline in comparison with 5 and 20 °C. The average casein micelle diameter was higher in retentate produced at 5 and 20 °C.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!