Layer-by-layer assembly based low pressure biocatalytic nanofiltration membranes for micropollutants removal

2020 ◽  
Vol 615 ◽  
pp. 118514 ◽  
Author(s):  
Xin Li ◽  
Yilin Xu ◽  
Kunli Goh ◽  
Tzyy Haur Chong ◽  
Rong Wang
Keyword(s):  
Low Pressure ◽  
Layer By Layer ◽  
Nanofiltration Membranes ◽  
Layer By Layer Assembly ◽  
Layer Assembly

High flux nanofiltration membranes based on layer-by-layer assembly modified electrospun nanofibrous substrate

2018 ◽  
Vol 434 ◽  
pp. 573-581 ◽  
Author(s):  
Guo-Rong Xu ◽  
Xiao-Yu Liu ◽  
Jian-Mei Xu ◽  
Lu Li ◽  
Hui-Chao Su ◽  
...  
Keyword(s):  
Layer By Layer ◽  
High Flux ◽  
Nanofiltration Membranes ◽  
Layer By Layer Assembly ◽  
Layer Assembly

Complex formation of modified chitosan and carboxymethyl cellulose and its effect on paper properties

TAPPI Journal ◽  
2009 ◽  
Vol 8 (6) ◽  
pp. 29-35 ◽  
Author(s):  
PEDRAM FATEHI ◽  
LIYING QIAN ◽  
RATTANA KITITERAKUN ◽  
THIRASAK RIRKSOMBOON ◽  
HUINING XIAO
Keyword(s):  
Carboxymethyl Cellulose ◽  
Polymer System ◽  
Layer By Layer ◽  
Paper Strength ◽  
Anionic Polymer ◽  
Paper Properties ◽  
Modified Chitosan ◽  
Layer By Layer Assembly ◽  
Polyelectrolyte Titration ◽  
Layer Assembly

The application of an oppositely charged dual polymer system is a promising approach to enhance paper strength. In this work, modified chitosan (MCN), a cationic polymer, and carboxymethyl cellulose (CMC), an anionic polymer, were used sequentially to improve paper strength. The adsorption of MCN on cellulose fibers was analyzed via polyelectrolyte titration. The formation of MCN/CMC complex in water and the deposition of this complex on silicon wafers were investigated by means of atomic force microscope and quasi-elastic light scattering techniques. The results showed that paper strength was enhanced slightly with a layer-by-layer assembly of the polymers. However, if the washing stage, which was required for layer-by-layer assembly, was eliminated, the MCN/CMC complex was deposited on fibers more efficiently, and the paper strength was improved more significantly. The significant improvement was attributed to the extra development of fiber bonding, confirmed further by scanning electron microscope observation of the bonding area of fibers treated with or without washing. However, the brightness of papers was somewhat decreased by the deposition of the complex on fibers. Higher paper strength also was achieved using rapid drying rather than air drying.

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