Zobrazeno 1 - 10
of 117
pro vyhledávání: '"Valentin I. Popa"'
Autor:
Elena Ungureanu, Maria E. Fortună, Denis C. Țopa, Carmen O. Brezuleanu, Vlad I. Ungureanu, Ciprian Chiruță, Razvan Rotaru, Bogdan M. Tofanica, Valentin I. Popa, Doina C. Jităreanu
Publikováno v:
Polymers, Vol 15, Iss 18, p 3794 (2023)
Given the predominantly negative impact of heavy metals on living organisms, the present study proposed to evaluate the adsorption performances under static conditions of Cd (II) from aqueous solutions on unmodified Sarkanda grass lignin compared to
Externí odkaz:
https://doaj.org/article/2d4af86ee90d4a5ca40d3507c48a8fdb
Autor:
Valentin I. Popa
Publikováno v:
Memoirs of the Scientific Sections of the Romanian Academy, Vol XLIII, Pp 47-58 (2020)
Settlement of the world crisis of energy and chemical compounds, strongly manifested since 1973, urged the intensification of researches for finding new renewable resources capable of assuring a sustainable development. In this context, phytomass/ bi
Externí odkaz:
https://doaj.org/article/614a5401ed8d4e098f526f6415a2e24f
Autor:
Valentin I. Popa
Publikováno v:
Memoirs of the Scientific Sections of the Romanian Academy, Vol XLIII, Pp 7-11 (2020)
The paper presents some peculiar aspects of the life and scientific activity of acad. Cr.I.S., seen through the eyes of his close collaborators.
Externí odkaz:
https://doaj.org/article/93dbfbc84e9947c5b93c69e648db6253
Publikováno v:
Polymers, Vol 14, Iss 19, p 4106 (2022)
Marine macroalgae biomass is a valuable renewable resource that can be used for the development of bioeconomy through the valorisation of valuable compounds. The aim of the current study is separate macroalgal polysaccharides with bioactive propertie
Externí odkaz:
https://doaj.org/article/497fa3026f374157a746605c51d6d5d8
Publikováno v:
BioResources, Vol 3, Iss 4, Pp 1370-1376 (2008)
The chemical modification of lignin through hydroxymethylation and epoxidation is a way to develop new application fields and improvement of lignin performances. In this paper the influence of reaction conditions was studied using different samples o
Externí odkaz:
https://doaj.org/article/f252c048fc9f40d6967a911ce043150b
Publikováno v:
BioResources, Vol 3, Iss 1, Pp 13-20 (2008)
The hydroxymethylation of alkali lignin with formaldehyde in alkaline solution was studied. The influence of reaction conditions of the hydroxymethylation of alkali lignin was followed by modifying the temperature, time, and the ratios of NaOH to lig
Externí odkaz:
https://doaj.org/article/72309280f67a424f9db4a86b7ca17e8c
Autor:
Valentin I. Popa, Anca Bălaş
Publikováno v:
BioResources, Vol 2, Iss 3, Pp 363-370 (2007)
The influences of flax lignin and phenolic compounds obtained from spruce bark on the development of Lycopersicon esculentum plantlets were evaluated. Depending on the applied treatment and the concentrations used, the natural aromatic compounds had
Externí odkaz:
https://doaj.org/article/e707cfebd0cd4248aa9762a779ffb43a
Publikováno v:
Journal of Environmental Engineering and Landscape Management, Vol 22, Iss 4 (2014)
The current study reveals the results of a phytoremediation process applied to a multi metal contaminated soil, located in close proximity to an energy power plant. Phytoremediation process was studied using the rapeseed cultivation, both in the pres
Externí odkaz:
https://doaj.org/article/77f4b9bd07b8426a9f36c5aeeaf2aaca
Autor:
Adina Mirela Ariton, Lucia C. Trinca, Valentin I. Popa, Doina Carmenica Jitareanu, Ovidiu Costica Ungureanu, Elena Ungureanu, Maria Emiliana Fortuna, Alina Elena Trofin
Publikováno v:
Cellulose Chemistry and Technology. 55:939-948
In this study, the adsorption of Pb2+ and Zn2+ ions from aqueous solutions onto lignin obtained from unmodified Sarkanda grass was analyzed. To ensure optimal process conditions, the retention of lead and zinc ions was tested at different experimenta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90963e294dacfbf02616f4165016e071
https://doi.org/10.35812/cellulosechemtechnol.2021.55.80
https://doi.org/10.35812/cellulosechemtechnol.2021.55.80
Autor:
Valentin I. Popa
Publikováno v:
Studia Universitatis Babeș-Bolyai Chemia. 66:89-96
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::213e19936c382a3ff0911b044e3ddb54
https://doi.org/10.24193/subbchem.2021.3.04
https://doi.org/10.24193/subbchem.2021.3.04