scholarly journals An Evaluation of the Possible Uses of CNT in Flow Conditions for Removing Humic Substances from Water

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2160
Author(s):  
Małgorzata Wolska ◽  
Zbigniew Ferenc ◽  
Anna Solipiwko-Pieścik
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Weight ◽  
Humic Substances ◽  
Organic Substance ◽  
Active Carbon ◽  
Adsorption Process ◽  
Low Molecular Weight ◽  
Flow Conditions ◽  
Naturally Occurring ◽  
Unit Effectiveness

This study concerns an evaluation of humic substance removal during an adsorption process on three sorbents: two consisting of carbon nanotubes embedded on a polymer (polypropylene and polyethylene) and granulated active carbon as a reference. The results that were obtained show a significantly lower organic substance removal effectiveness in the case of sorbents containing carbon nanotubes, with an insignificantly lower unit effectiveness (mg/g) of the nanosorbents during first two hours of adsorption. Unfortunately, nanosorbents only allow removing substances with a low molecular weight and high aromaticity, which significantly reduces the possibility of its use in technical conditions for naturally occurring water and the sorption capacity nanotubes were significantly lower in comparison to the GAC.

Low Molecular Weight Polypyrmidine for Release and Size Controlled Process of Single-Walled Carbon Nanotubes

2018 ◽  
Vol 19 (5) ◽  
pp. 927-933 ◽  
Author(s):  
Yuemaierjiang Maimaiti ◽  
Naziermu Dongmulati ◽  
Salamaiti Baikeri ◽  
Abulajiang Maimaiti ◽  
Rukeya Maitisidike ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Weight ◽  
Single Walled Carbon Nanotubes ◽  
Low Molecular Weight ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Size Controlled

Three dimensional heteroatom-doped carbon composite film for flexible solid-state supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (6) ◽  
pp. 4483-4489 ◽  
Author(s):  
Ben-Xue Zou ◽  
You Gao ◽  
Bo Liu ◽  
Yongpeng Yu ◽  
Yanhua Lu
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Composite Film ◽  
Active Carbon ◽  
Resin Composite ◽  
Three Dimensional ◽  
Carbon Composite ◽  
Low Molecular Weight ◽  
Supercapacitor Electrode ◽  
Flexible Supercapacitor

Three dimensional (3D) heteroatom-doped active carbon as a flexible supercapacitor electrode is explored with a starting material of silkworm fibers and low molecular weight phenol resin composite.

Chromatographic Fractionation of Some Synthetic Elastomers

1948 ◽  
Vol 21 (3) ◽  
pp. 682-683 ◽  
Author(s):  
Ivan Landler
Keyword(s):  
Molecular Weight ◽  
Cellulose Acetate ◽  
Active Carbon ◽  
Low Molecular Weight ◽  
High Polymer ◽  
Acrylonitrile Copolymer ◽  
Molecular Weights ◽  
The Mean ◽  
Mean Molecular Weight ◽  
Poor Solvent

Abstract Mark and Saito were the first to fractionate a high polymer (cellulose acetate) by chromatographic adsorption on blood carbon. They found that molecules of low molecular weight were adsorbed first, and that the mean molecular weight of the product which remained unadsorbed was higher than the original molecular weight. Levi and Giera confirmed this result, but did not succeed in fractionating Buna-S or polyisoprene, for these polymers were eluted by the solvent during the washing operation in the column. The present authors have carried out further experiments in this field with a study of three commercial synthetic elastomers, viz., GR-S (butadienestyrene copolymer), Perbunan-N (butadiene-acrylonitrile copolymer), and Visitanex (polyisobutylene). The polymer was adsorbed by starting with a poor solvent composed of a mixture of toluene and methanol ; the quantity of alcohol added was just below the threshold of precipitation. The adsorbent used was a mixture of 75 per cent of lamp black (80 square meters per gram) and 25 per cent of coarse active carbon. The latter served to prevent agglomeration of the lamp black. The adsorbent was divided into three layers, of 10 grams each. At the end of the tube was a filter of fritted glass. Filtration was carried out under pressure, the rate of flow thereby being maintained constant, The polymers were characterized by their intrinsic viscosities. The molecular weights which were estimated by means of the relation, found experimentally between the molecular weight and viscosity, are only approximate, for this relation holds true only for narrow fractions.

Naturally occurring low molecular weight inhibitors of neutral proteinases from PMN-granulocytes and of kallikreins

1978 ◽  
Vol 8 (1-2) ◽  
pp. 57-64 ◽  
Author(s):  
Hans Fritz ◽  
Hans Schiessler ◽  
Reinhard Geiger ◽  
Kjell Ohlsson ◽  
Karl Hochstrasser
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Naturally Occurring

scholarly journals Naturally occurring low-molecular-weight peptides from the blowfly Phormia regina

1968 ◽  
Vol 110 (4) ◽  
pp. 771-773 ◽  
Author(s):  
R. P. Bodnaryk ◽  
L. Levenbook
Keyword(s):  
Molecular Weight ◽  
Phormia Regina ◽  
Low Molecular Weight ◽  
Naturally Occurring

Freely occurring α-l-aspartyl-l-histidine, β-alanyl-l-histidine (carnosine), α-l-aspartyl-α-l-lysine, l-asparaginyl-α-l-lysine, α-l-glutamyl-α-l-lysine, l-isoleucyl-α-l-lysine, l-seryl-α-l-lysine, l-valyl-α-l-lysine and glycyl-α-l-lysyl-α-l-lysine were identified in young larvae (second and third instars) of the blowfly (Phormia regina).

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