Cadmium and copper absorption mediated by a poly(vinyl alcohol)‐b‐polyacrylonitrile based micelle/Trichosporon cutaneum cell system

Abstract

The micelles of a recently synthesized copolymer of poly(vinyl alcohol)-b-polyacrylonitrile added to the growth solution of the filamentous yeast Trichosporon cutaneum strain R57 led to the formation of a binary system consisting of micelles and cells. The resulting micelle/cell system was studied as a model for the removal of toxic concentrations of heavy-metal ions (cadmium and copper) from aqueous solutions. The ionremoval efficiency mediated by this system was higher than for free-floating cells. The copper-removal efficiency from the solution reached a level of 65% after 24 h of cultivation, whereas the cadmium-removal efficiency reached 62% after 6 h of growth. For comparison, the free-floating cells removed 42% of copper and only 38% of cadmium from the solutions. The effects of surface interactions between the cells and polymer micelles on the biosorption capacity of the cells are discussed in the article.

Preparation, characterization, and testing of a composite membrane with pH sensitivity

“…Thus, the Cu(II) amount was excessive in 100 mmol/L CuSO4 solution for the membrane adsorption, and this led to the lower removal ratio for 100 mmol/L solution. The adsorption quantity of Cu(II) for the membrane (M‐22‐400) was about 1.18 mmol/g (75.52 mg/g membrane), which was similar to those for the reported membranes,16, 47 and to the absorption amounts by other reported removal techniques 48, 49…”

Immobilization of Trichosporon Cutaneum R57 on PVA/TEOS/MPTEOS Hybrid Matrices for Removal of Manganese Ions

“…Further, the synthesized PVA/ teoS/MPteoS hybrid materials were applied as matrices for immobilization of the filamentous yeast Trichosporon cutaneum R57. the high potential of this strain to remove copper, cadmium, manganese and chromium ions from contaminated waters was demonstrated in previous studies (7,8,9,10). in our preliminary experiments, it was established that a concentration of 5 mmol/l MnSo 4 can be considered as an inhibitory threshold value and a concentration of 10 mmol/l MnSo 4 as a moderately inhibitory value, since an abnormal morphology was observed.…”

“…MPteoS (3-mercaptopropyltriethoxysilane) is an organosilane with Sh groups that can provide additional adsorption sites and increased efficiency of heavy metal removal (12). the high potential of Trichosporon cutaneum strain R57 for heavy metal (copper, cadmium and chromium) removal from contaminated waters was shown in our previous studies (7,8,9,10). To the best of our knowledge, there are no published reports about preparation of hybrid materials based on PVA, teoS and MPteoS in aqueous solutions.…”