Cellulose derivatives have been widely used as adsorbents for the removal of micropollutants such as drugs, dyes, and metals, due to their abundance, low cost and non-contaminating nature. In this context, several studies have been performed searching for new adsorbents (cellulose derivatives) efficient at contaminant removal from aqueous solutions. Thus, a new adsorbent was synthesized by chemical modification of cellulose with ethylenediamine in the absence of solvent and applied to the adsorption of amitriptyline (AMI) in aqueous solution. The modification reaction was confirmed by X-ray Diffraction (XRD), elemental analysis, Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetry/Differential Scanning Calorimeter (TG/DSC), solid state Nuclear Magnetic Resonance of ¹H and ¹³C (¹H-NMR and ¹³C-NMR). Moreover, the effectiveness of reaction was confirmed by computational calculations using Density Functional Theory (DFT) at level B3LYP/6-31G(d). This adsorption process was influenced by pH, time, concentration, temperature and did not show significant changes due to the ionic strength variation. Through these experiments, it was observed that the maximum adsorption capacity of AMI by CN polymer at 298 K, 300 min, and pH 7 was 87.66 ± 0.60 mg·g⁻¹.

This article examines urban mining in Brazil, highlighting its unique context compared to other regions. While European Union focuses on critical metal supply and advanced Waste Electrical and Electronic Equipment (WEEE) legislation and circular economy, Brazil’s urban mining is primarily driven by waste management and social inclusion. The current investigation was underpinned by the PRISMA extension for Scoping Reviews (PRISMA-ScR framework), using targeted searches on the Web of Science platform for technological processes and the Brazilian scenario, complemented by an analysis of legislative evolution and a Critical Discourse Analysis of national policies. The results indicate that, despite advanced legislation, significant gaps exist between discourse and practice, highlighting the need for technological appropriation, specific public policies that incentivize reverse logistics and the integration of the informal sector, and overcoming infrastructural challenges. It concludes that Brazil has a unique opportunity to develop an urban mining model that pioneeringly integrates environmental sustainability, technological innovation, and social inclusion, demanding coordinated efforts to overcome existing barriers.

This review article explores the challenges and opportunities for the development of urban mining in Brazil, differentiating its context from that of other regions, such as Europe, where the focus predominantly lies on the security of supply of critical metals. In Brazil, however, waste management and social inclusion are primary motivators. The methodology employed a critical analysis of the scientific literature retrieved from the Web of Science platform, using targeted searches for technological processes and the Brazilian scenario, complemented by an analysis of legislative evolution and a Critical Discourse Analysis of national policies. The results indicate that, despite advanced legislation, significant gaps exist between discourse and practice, highlighting the need for technological appropriation, specific public policies that incentivize reverse logistics and the integration of the informal sector, and overcoming infrastructural challenges. It concludes that Brazil has a unique opportunity to develop an urban mining model that pioneeringly integrates environmental sustainability, technological innovation, and social inclusion, demanding coordinated efforts to overcome existing barriers.

This work studies the reaction mechanism of triiodide ion (I3–) from iodine (I2) and iodide anion (I–), furthermore it investigates the thermodynamic preference of formation of I3– in three different solvents. Through DFT calculations and using the continuous polarizable model (PCM) it was possible to determine the reaction mechanism, as well as to show that the formation of the triiodide ion, from iodine and iodide, is favored in solvents of less polarity.

The heat formation of 33 molecules for the iodine compounds were performed using the functional density theory (DFT) (B3LYP, M06-2X and WB97XD), and the basis sets (6-311G (d, p) and cc-pVQZ + d). The best agreement with experimental data was achieved by using B3LYP/cc-pVQZ+d, WB97XD/6-311G (d,p) and MP2/6-311G (d,p).