A5015970332- Adsorption and biosorption for pollutant removal
- Phytochemicals and Antioxidant Activities
- Ammonia Synthesis and Nitrogen Reduction
- Phosphorus and nutrient management
- Groundwater and Isotope Geochemistry
- Agricultural and Food Sciences
- Pesticide and Herbicide Environmental Studies
- Essential Oils and Antimicrobial Activity
- Membrane Separation Technologies
- Effects and risks of endocrine disrupting chemicals
- Edible Oils Quality and Analysis
- Growth and nutrition in plants
- Insect behavior and control techniques
- Nanomaterials for catalytic reactions
- Sunflower and Safflower Cultivation
- Covalent Organic Framework Applications
- Microplastics and Plastic Pollution
- Weed Control and Herbicide Applications
- Pharmaceutical and Antibiotic Environmental Impacts
- Wastewater Treatment and Nitrogen Removal
- Fluoride Effects and Removal
- Phytochemistry and Biological Activities
- Water Treatment and Disinfection
- Postharvest Quality and Shelf Life Management
- Industrial Gas Emission Control
Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul
2017-2024
Instituto Federal do Sertão Pernambucano
2016-2018
Universidade Federal do Rio Grande do Sul
2012-2016
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2014
Abstract Activated carbon (AC) is an adsorbent used in most adsorption processes related to micro removal of pollutants from the water phase, but application limited due high costs and environmental issues disposal after saturation. Different regeneration techniques, reducing minimizing impact, are reported for reuse saturated AC. These techniques can be performed via two separate strands: based only on desorption adsorbed compounds AC, or decomposition Literature ACs reviewed promising...
Abstract In this work, microwave‐assisted extraction (MAE) technique was developed for the of total polyphenols from Physalis angulata . Several parameters MAE procedure (ethanol concentration, irradiation power, time and liquid‐to‐solid ratio) were assessed through an experimental Box‐Behnken design (four variables three levels). Results indicated a variation 3.74 to 0.03 mg GAE/g extract (total polyphenol), 7.77 0.5 mg/L (gallic acid), 0.55 0.27 (ellagic 0.26 0.02 (caffeic 0.86 0.25...
An electrochemical process was used to investigate the activated carbon regeneration efficiency (RE) saturated with aromatics. For this purpose, an reactor developed and operational conditions of equipment were investigated, which is applied in process. The influence parameters such as processing time, current used, polarity fluid (electrolyte) studied. performance evaluated by adsorption tests, using phenol adsorbate. increase time found enhance RE. Another aspect that indicated a better...
In this study, nitrate (NO3-) removal from aqueous solutions was investigated using granular activated carbon (GAC) modified with CaCl2. Batch sorption studies were performed as a function of sorbent dose, initial concentration and pH. Sorption maximized between pH 3 9. Studies on the effect showed that ion exchange mechanism might be involved in process. The percentage removed increased increasing concentration, ideal dose found to 20 g?L-1. Four isotherm models-Langmuir, Freundlich,...
The efficiency of the application a chemically-modified activated carbon surface was investigated. purpose this study to examine effect treatment with CaCl2 solution at concentration 2000 mg.L-1 on sorption nitrate ions from aqueous solutions in successive sorption/t reatment cycles. sorbent initially subjected chemical and subsequently process. Nine cycles were performed. concentrations measured by UV-Vis spectrophotometry before after sorption. results show that caused significant increase...
Granular activated carbon was used in the sorption of nitrate ions with subsequent regeneration by assessing capacity sorbent successive cycles sorption/regeneration (S/R). Solutions HCl, C6H8O7, NaOH, CaCl2, as well H2O were employed saturated nitrate. Solution CaCl2 best regenerative agent. Contact times 30 min and 400 mL 2,000 mg L−1 solution for regeneration. Twenty S/R, which yielded 54% removal at end cycles, possible. During regeneration, concentration Ca2+ monitored to keep initial...
In this work, granular activated carbon (GAC) functionalised with CaCl2 was used to remove nitrate and sulphate from aqueous solutions. Functionalisation influenced the physico-chemical properties improved adsorption capacity of carbon. The effect pH on investigated, no significant difference observed. process found be an exothermic nature. Thermodynamic parameters were calculated including change in Gibbs free energy (ΔG°), enthalpy (ΔH°) entropy (ΔS°). pseudo-first-order model,...
Abstract Fruits are widely used to obtain and study bioactive compounds. Among them, the tarumã ( Vitex megapotamica ) is still understudied. The extraction of compounds from powdered pulp ripe fruit was studied selection several variables process through experimental design Plackett–Burman: pH, solid:liquid ratio, agitation, temperature in an time 3 h. extracts obtained were evaluated for antioxidant activity by 2,2′‐azino‐bis‐(3‐ethylbenzothiazoline‐6‐sulfonic acid) (ABTS),...
O bisfenol-A (BPA), um monômero usado na fabricação de resinas epóxi e plásticos policarbonato, é considerado potente desregulador endócrino que provoca diversas doenças. Este composto pode ser encontrado água abastecimento humano, em decorrência do uso cotidiano produtos o apresentam sua composição. Assim, objetivo deste trabalho foi estudar a remoção BPA soluções aquosas através da técnica adsorção processo contínuo utilizando carvão ativado granular (CAG) como sólido sorvente. Foram...