The growing interest in using low-cost methods that use natural sources makes the study of adsorption processes increasingly frequent and common. Thus, the use of uçá crab shell (Ucides cordatus) in the adsorption of reactive dye (reactive blue 222) was studied in two systems (S1 and S2) in a finite bath, with a scale-up of 12 times and considering different forms of agitation. The biosorbent material was previously characterized from FTIR and EDX spectroscopies, SEM, physical adsorption of N₂, and point of zero charge. The kinetic study allowed modeling the experimental data and defining the equilibrium time for the S1 system as 400 min, and the S2 system as 360 min. The equilibrium adsorption capacities are 3.623 mg·g⁻¹ (S1) and 4.191 mg·g⁻¹ (S2). The pseudo-second-order (PSO) model best described the experimental data. The favorable multilayer adsorption was confirmed for the isothermal analysis, and the Freundlich and Sips models represented the experimental data of S1 and S2, respectively. The results obtained are positive indications of the scale-up of the S2 system.

Objective: This study aims to evaluate the efficiency of electroflocculation using recycled aluminum electrodes for the treatment of effluents from the Ipojuca River, highlighting its potential for environmental sustainability and waste reduction. Theoretical Framework: The research is based on principles of electrochemical treatment and water quality analysis, focusing on parameters such as pH, turbidity, biochemical oxygen demand (BOD), chemical oxygen demand (COD), phosphorus concentration, and the impact of electrode degradation. Method: Experimental tests were conducted using a batch electroflocculation reactor equipped with aluminum electrodes derived from repurposed aluminum cans. Water samples were collected from three distinct points along the Ipojuca River, and physicochemical parameters were analyzed before and after treatment according to environmental regulations. Results and Discussion: The electroflocculation process proved effective in significantly reducing turbidity, phosphorus concentration, and COD, while also improving pH levels. The results demonstrated compliance with environmental standards, confirming the viability of the process for effluent treatment. Additionally, the reuse of aluminum electrodes not only enhanced efficiency but also minimized the environmental impact associated with aluminum waste disposal. Research Implications: This study highlights the potential of electroflocculation as an effective and sustainable alternative for water treatment, offering an innovative approach to mitigate pollution in the Ipojuca River. Originality/Value: By demonstrating the feasibility of using recycled aluminum electrodes in electroflocculation, this study reinforces the importance of sustainable waste management practices and their contribution to reducing environmental contamination.

Objective: This study aims to contextualize the advancements in the application of nanoparticles, microemulsions, and nanoemulsions in drilling fluids, highlighting their contributions to the efficiency and sustainability of operations in the oil industry. Theoretical Framework: The research is grounded in principles of nanotechnology and fluid dynamics, analyzing the role of drilling fluids in aspects such as wellbore instability, rheological properties, filtration, and physicochemical characteristics. Method: A systematic literature review was conducted, encompassing scientific articles, conference papers, technical books, and patents. The research included both foundational and recent studies to identify trends and advancements in drilling fluid formulations. Results and Discussion: Drilling fluid formulations have evolved to address challenges such as diverse well geometries, extreme temperature and pressure gradients, and environmental regulations. The incorporation of nanoparticles into drilling fluids has demonstrated benefits such as reduced circulation losses and increased resistance to high pressures and temperatures. Nanoemulsions and microemulsions have shown reduced environmental impact compared to oil-based fluids, along with improved filtration properties, rheology, and thermal resistance compared to water-based fluids. Research Implications: The findings underscore the importance of nanoparticles and nanoemulsion and microemulsion systems for enhancing the efficiency and sustainability of drilling fluids, meeting the demand for environmentally responsible solutions. Originality/Value: This study provides a comprehensive analysis of advancements in drilling fluid formulations, emphasizing the sustainable potential of nanoparticles, nanoemulsions, and microemulsions, and reinforcing their relevance to the future of the oil industry.

Objective: The objective of this study is to contextualize the advancements in the application of micro- and nanoemulsions in preflush fluids within the oil industry. Theoretical Framework: The study draws upon concepts in nanotechnology and fluid dynamics, focusing on the role of preflush fluids in wellbore cleaning and rock wettability adjustment. Method: A bibliometric analysis and review of the literature were conducted. The bibliometric analysis included 145 keywords and 382 articles related to preflush fluids in the oil industry, published between 2003 and 2023. The data were analyzed and visualized using VOSviewer. Results and Discussion: The results revealed fluctuations in the number of publications on this topic over the years. The bibliometric review highlighted the evolution of preflush fluid formulations, particularly those involving micro- and nanoemulsion systems. These fluids demonstrated high oil solubilization capacity and wettability reversal, effectively addressing formation stability issues. Research Implications: The findings underscore the significance of micro- and nanoemulsion systems in enhancing the efficiency and environmental sustainability of preflush fluids used in oil extraction operations. Originality/Value: This study contributes to the literature by offering a comprehensive analysis of the advancements in preflush fluid formulations, emphasizing the sustainable potential of micro- and nanoemulsions in the oil industry.