Cr(OH)(3)-NPs-CNC hybrid nanocomposite: a sorbent for adsorptive removal of methylene blue and malachite green from solutions

In this article, Cr(OH)₃ nanoparticle-modified cellulose nanocrystal (CNC) as a novel hybrid nanocomposite (Cr(OH)₃-NPs-CNC) was prepared by a simple procedure and used as a sorbent for adsorptive removal of methylene blue (MB) and malachite green (MG) from aqueous solution. Different kinetic models were tested, and the pseudo-second-order kinetic model was found more suitable for the MB and MG adsorption processes. The BET and Langmuir models were more suitable for the adsorption processes of MB and MG. Thermodynamic studies suggested that the adsorption of MB and MG onto Cr(OH)₃-NPs-CNC nanocomposite was a spontaneous and endothermic process. The maximum adsorption capacities for MB and MG were reached 106 and 104 mg/g, respectively, which were almost two times higher than unmodified CNC. The chemical stability and leaching tests of the Cr(OH)₃-NPs-CNC hybrid nanocomposite showed that only small amounts of chromium were leached into the solution.Farzin Nekouei, Shahram Nekouei, Farzaneh Keshtpour, Hossein Noorizadeh, Shaobin Wan

Fabrication of stable copper nanoparticles embedded in nanocellulose film as a bionanocomposite plasmonic sensor and thereof for optical sensing of cyanide ion in water samples

Herein, an optical plasmonic chemosensor was fabricated via in situ embedding of stable copper nanoparticles (Cu NPs) within flexible nanocellulose film (ECNPs-NC film) utilized for optical sensing of cyanide (CN⁻). Glycerol, as a plasticizer, was added to the nanocellulose suspension to improve ductility of nanocellulose-based film. In addition, to enhance the stability of Cu NPs against oxidizing and corrosion, the fabricated ECNPs-NC film was immersed and coated by benzotriazole solution. The Cu NPs were stable for 4 months. The fabricated ECNPs-NC film was characterized by various methods such as field emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopic, dynamic light scattering, thermo-gravimetric analysis, and energy-dispersive X-ray spectroscopy. Analytical parameters influencing the efficiency of ECNPs-NC film fabrication were investigated and optimum conditions were stablished. The fabricated ECNPs-NC film was applied as a novel optical sensor for CN⁻ detection in water samples. By changing in CN⁻ concentration, surface plasmon resonance absorption intensity was changed and it was linear in the range of 0.25–0.40 µg mL⁻¹ with a detection limit of 0.015 µg mL⁻¹.Mehran Pouzesh, Shahram Nekouei, Mohammad Ali Ferdosi Zadeh, Farzaneh Keshtpour, Shaobin Wang, Farzin Nekoue

Ewing’s Sarcoma of Mandible: Practical Approach to a Challenging Case

As a rare entity, sarcomas of the head and neck are challenging cases. In this paper, we represent a unique case of Ewing sarcoma of mandible, serving as an example of multidisciplinary team importance in a developing country