Browsing by Author "Popa, Valentin I."

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  • Adsorption of Cu (II) from aqueous solution on Sarkanda grass lignin: equilibrium and kinetic studies 
    Ungureanu, Elena; Jităreanu, Carmenica-Doina; Trofin, Alina-Elena; Ungureanu, Ovidiu C.; Fortună, Maria-Emiliana; Ariton, Adina-Mirela; Trincă, Lucia-Carmen; Popa, Valentin I. (Editura "Ion Ionescu de la Brad" Iasi, 2022)
    In this study, the adsorption of copper ions from aqueous solution onto lignin obtained from unmodified Sarkanda Grass was analyzed. To ensure optimal reaction conditions, the retention of copper ions was tested at different ...
  • Aspects concerning the influence of some polymeric composite structures susceptible at biodegradation on the process of plant development 
    Ungureanu, Elena; Jităreanu, Carmenica-Doina; Trofin, Alina-Elena; Ungureanu, Ovidiu C.; Ariton, Adina-Mirela; Trincă, Lucia-Carmen; Popa, Valentin I. (Editura ”Ion Ionescu de la Brad” Iasi, 2021)
    This paper presents some results referring to the influence of some composite structures based on lignin (L), wood powder (PL), and low density polyethylene (LDPE) (Arpechim Pitesti), incorporated into the soil, on the ...
  • Chemical and spectral characterizations for some lignin products 
    Ungureanu, Elena; Jităreanu, Carmenica-Doina; Trofin, Alina-Elena; Sandu, Tatiana; Popa, Valentin I. (“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iași, 2015)
    Lignin derivative (the commercial product - Protobind 1000) offered by the Granit Recherche Developement S.A. company, Lausanne-Schwitzerland was synthesized from annual plants. The present study’s aim was to modify commercial ...
  • Chemical transformations and spectral characterization to Protobind 3000 lignin 
    Ungureanu, Elena; Ariton, Adina-Mirela; Trofin, Alina-Elena; Jităreanu, Carmenica-Doina; Ungureanu, Ovidiu C.; Popa, Valentin I. (“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iași, 2018)
    Lignin derivative (the commercial product -Protobind 3000) offered by the Granit Recherche Developement S.A. company, Lausanne-Schwitzerlandwas synthesized from annual plants. The present study’s aim was tomodify ...
  • Comparison Adsorption of Cd (II) onto Lignin and Polysaccharide-Based Polymers 
    Ungureanu, Elena; Fortună, Maria-Emiliana; Țopa, Denis-Constantin; Brezuleanu, Carmen-Olguța; Ungureanu, Vlad; Chiruță, Ciprian; Rotaru, Răzvan; Tofanică, Bogdan-Marian; Popa, Valentin I.; Jităreanu, Carmenica-Doina (MDPI, 2023-09-17)
    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 ...
  • Gravitational analyses applied to protobind 1000 lignin 
    Ungureanu, Elena; Ungureanu, Ovidiu C.; Trofin, Alina-Elena; Ariton, Adina-Mirela; Jităreanu, Carmenica-Doina; Popa, Valentin I. (“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iași, 2020)
    Lignin derivative (the commercial product -Protobind 1000) offered by the Granit Recherche Developement S.A. company, Lausanne-Schwitzerlandwas synthesized from annual plants. The ligninstands out by a very large range ...
  • Gravitational sedomentometrical analyses applied to the sarkanda grass lignin 
    Ungureanu, Elena; Ungureanu, Ovidiu C.; Trofin, Alina-Elena; Ariton, Adina-Mirela; Jităreanu, Carmenica-Doina; Popa, Valentin I. (“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iași, 2019)
    The lignin stands out by a very large range of applications in extremely various domains. The adsorption-desorption capacity, ion exchange capacity and its catalytic properties are just a few specific ...
  • Lignin derivatives modified by hydroxymethylation and epoxydation reactions 
    Ungureanu, Elena; Jităreanu, Carmenica-Doina; Trofin, Alina-Elena; Ungureanu, Ovidiu C.; Popa, Valentin I. (“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iași, 2017)
    Lignin derivative (the commercial product -Protobind 2000) offered by the Granit Recherche Developement S.A. company, Lausanne-Schwitzerlandwas synthesized from annual plants. The present study’s aim was tomodify ...
  • Natural bioactive compounds as plant growth regulators 
    Ignat, Ioana; Stingu, Alina; Volf, Irina; Popa, Valentin I. (“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iaşi, 2009)
    Polyphenolic compounds are biosynthesized in plant as secondary metabolites, having an important role in sensorial and nutritional quality of fruits, vegetables and plants. In this work, the phenolic extracts were obtained ...
  • Optimization and modeling of Cr (VI) biosorption from aqueous solution on biosorbent - Sarkanda grass lignin 
    Ungureanu, Elena; Chelariu, Elena-Liliana; Tofănică, B.I.; Popa, Valentin I.; Jităreanu, Carmenica-Doina (Editura ”Ion Ionescu de la Brad” Iasi, 2022)
    The negativ impact induced by the presence of heavy metals in the environment and on the health of living organisms is accentuated by their long-term persistence, as a result of their low solubility and mobility and in ...
  • Spruce bark aqueous extracts as modulator in copper induced stress 
    Stingu, Alina; Ignat, Ioana; Volf, Irina; Popa, Valentin I. (“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iaşi, 2009)
    Plants manifest a certain reaction against increasing of heavy metals toxic concentration in the cultivated soils. The differences depends on plant sensitivity, species, time exposure intensity (concentration of heavy ...
  • Studies on kinetics and adsorption equilibrium of lead and zinc ions from aqueous solutions on Sarkanda grass lignin 
    Ungureanu, Elena; Trofin, Alina-Elena; Trincă, Lucia-Carmen; Ariton, Adina-Mirela; Ungureanu, Ovidiu C.; Fortună, Maria-Emiliana; Jităreanu, Carmenica-Doina; Popa, Valentin I. (Editura Academiei Romane, 2021-06)
    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 ...
  • Thermodynamic studies on Cd (II) retention from aqueous medium on Sarkanda grass lignin nanoparticles 
    Ungureanu, Elena; Chelariu, Elena-Liliana; Ungureanu, Ovidiu C.; Fortună, Maria-Emiliana; Popa, Valentin I.; Jităreanu, Carmenica-Doina (Editura ”Ion Ionescu de la Brad” Iasi, 2022)
    Due to its high toxicity and its capacity to accumulate and contaminate, cadmium is a potentially harmful substance for all ecosystems and humans or animals in the contaminated area. The present study proposes as a substrate ...
  • Use of Sarkanda grass lignin as a possible adsorbent for as (III) from aqueous solutions – kinetic and equilibrium studies 
    Ungureanu, Elena; Jităreanu, Carmenica-Doina; Trofin, Alina-Elena; Fortună, Maria-Emiliana; Ungureanu, Ovidiu C.; Ariton, Adina-Mirela; Trincă, Lucia-Carmen; Brezuleanu, Stejărel; Popa, Valentin I. (Editura Academiei Romane, 2022-05-06)
    Considering the negative effects of polluting species on the environment and human health, in particular heavy metals, and the need for efficient use of resources, the present study investigated the adsorption of As (III) ...