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Plant-Mediated Synthesis of Nanoparticles
Published in Klaus D. Sattler, st Century Nanoscience – A Handbook, 2019
Alireza Ebrahiminezhad, Seyedeh-Masoumeh Taghizadeh, Saeed Taghizadeh, Younes Ghasemi, Aydin Berenjian, Mostafa Seifan
Iron oxyhydroxides possess four different polymorphs, namely goethite (α-FeOOH), akaganéite (β-FeOOH), lepidocrocite (γ-FeOOH), and feroxyhyte (δ-FeOOH). Nanoparticles of FeOOH are one of the most interesting candidates for air and water pollution removal (Ebrahiminezhad et al. 2017g). These nanoparticles are attracting increasing interest due to their significant properties such as biocompatibility, excellent visible light absorption, and high photostability (Jelle et al. 2016).
Preparation of magnetic nanoparticles by one step synthesis with morphology of particles changed based on time of reaction and temperature treatment
Published in Journal of Experimental Nanoscience, 2021
Tomáš Solný, Petr Ptáček, Tomáš Opravil, Lucie Dlabajová, Matěj Březina, Jiří Másilko, Jiří Švec, Rajan Ambat
Synthetic routes of nanosized iron oxides particles (ionp) are of great importance due to multiple applications of these particles including biomolecular separation, magnetic resonance imagining, special coating applications, drug delivery, gravity sensors, catalysis and many others [1–3]. Ionp properties include magnetic behaviour, uniform size distribution and high surface volume. Among ionps with magnetic properties we can include a range of iron oxides (maghemite γ-Fe2O3, hematite α-Fe2O3, magnetite Fe3O4), oxide – hydroxides (goethite α-FeOOH, feroxyhyte δ-FeOOH) and the combination of ferrous and ferric oxides.
Biosorption of cadmium from aqueous solution by combination of microorganisms and chitosan: response surface methodology for optimization of removal conditions
Published in Journal of Environmental Science and Health, Part A, 2023
Elham Khanniri, Mojtaba Yousefi, Amir Mohammad Mortazavian, Nasim Khorshidian, Sara Sohrabvandi, Mohammad Reza Koushki, Saeideh Esmaeili
Figure 9 shows the effects of the competing ions (Pb (II), Ca (II), Mg (II), Zn (II) and Fe (II)) on the biosorption process of Cd (II) by mixture of B. longum and chitosan. The data indicated that the presence of interfering ions had less effect on the Cd (II) elimination. However, among the tested coexisting cations, the presence of Pb (II) had a greater effect on Cd (II) biosorption. It seems that Pb (II) has been able to occupy some of the adsorption sites on the adsorbent. Similar observations have been found regarding the high affinity of Cd (II) to garbage ash in the presence of other metals such as iron (Fe), manganese (Mn), lead (Pb), calcium (Ca), magnesium (Mg), sodium (Na) and potassium (K) .[93] In a study by Kokkinos et al.[94] it was found that Cd (II) adsorption on tetravalent manganese feroxyhyte was more than Ni and Hg (mercury). High atomic radius and low hydration free energy of Cd compared to Ni were the reasons for its high selectivity. Guo et al.[95] investigated the effect of Zn (II), Pb (II) and Cu (II) on Cd (II) sorption by poly (N-isopropyl acrylamide) grafted and modified g-C3 N4 magnetic imprinted ions polymers. The authors declared that prepared adsorbent was most selective to Cd (II) and the similarity of the ionic radius of Pb (II) and Cd (II) had no effect on the selectivity of the adsorbent toward Cd (II). On the other hand, Shami et al.[96] mentioned that the selectivity order of metals by activated coal waste was Cu (II) > Cd (II) > Zn (II) > Pb (II). These results demonstrated that various factors such as ionic radius, hydration energy and electronegativity can affect the selectivity and affinity of target ion toward other metals.