Alexandre Torres

Universidade do Estado do Rio de Janeiro (UERJ) · DEQA/FAT

The organophosphorus class of compounds has several usages nowadays. Some halogenated organophosphorus are used as flame retardants, and others are used as pesticides worldwide. In the last case, those compounds are subject to law regulation. They are now used as chemical weapons in many wars and terrorist attacks. Due to this variety of usages and...

Fourteen multivariate regression models were applied to model the bio-oil yield obtained by pyrolysis using different combinations of predictor variables. The data modeling was separated into the reactor regime: batch and continuous. For batch reactor, the Cubist model with the radial base function provided the best bio-oil prediction result with R...

Este estudo aborda um problema de classificação de dados de Biomassa e tem como um dos objetivos identificar as variáveis mais relevantes para a classificação do tipo de pirólise de Biomassa. Além disso, o trabalho tem o objetivo de avaliar se as classes dos tipos de pirólise são suficientes para caracterizar esse processo químico. O algoritmo de F...

This work aims to develop an auto-machine learning method using Mid-Infrared (MIR) spectroscopy data to determine the cold filter plugging point (CFPP) and kinematic viscosity at 40 ºC of biodiesel, diesel, and mixtures samples. The biodiesel was obtained by the transesterification reaction and later purified. The first dataset was composed of 108...

Multivariate calibration based on partial least squares, random forest, and support vector machine methods, combined with the MissForest imputation algorithm, was used to understand the interaction between ozone and nitrogen oxides, carbon monoxide, wind speed, solar radiation, temperature, relative humidity, and others, the data of which were coll...

Multivariate calibration based on Partial Least Squares (PLS), Random Forest (RF) and Support Vector Machine (SVM) methods combined with variable selections tools were used to model the relation between the near-infrared spectroscopy data of biodiesel fuel to its physical-chemical properties. The cold filter plugging point (CFPP) and a kinematic vi...

The use of renewable energy sources is becoming increasingly necessary. Biomass is considered to have potential to be used as an alternative energy source. The bio-oil obtained of biomass pyrolysis is used as fuels and chemicals products. The yield and composition of pyrolysis oil depend on biomass composition and operating parameters of the proces...

Partial least squares regression (PLS) and support vector machine regression (SVM) were used to model the relationship between mid-FT-IR spectroscopic data and the density, refractive index and cold filter plugging point of biodiesel samples and their blends. A horizontal attenuated total reflectance mid-Fourier transform infrared spectroscopy (HAT...

Abstract This study evaluates the impact of biofuels on the air quality of the city of Rio de Janeiro using an air quality model based on the trajectory model OZIPR associated with the SAPRC chemical model. The results show that the increase in biodiesel use reduces ozone levels in the atmosphere by 10.2 %, using Biodiesel with Ethanol and Diesel m...

The photocatalytic degradation of phenol in aqueous suspensions of TiO2 under different salt concentrations in an annular reactor has been investigated. In all cases, complete removal of phenol and mineralization degrees above 90% were achieved. The reactor operational parameters were optimized and its hydrodynamics characterized in order to couple...

The main issue of this work is water reuse. The methodology was tested with the aim of reduce simultaneously the water demand and the generated effluent. This work intends supply a tool to the sustainable development related to the water use management. MathCAD® and EXCEL® were used like computational resource to necessary mathematical calculations...

Three technologies were tested (TiO2/UV, H2O2/UV, and TiO2/H2O2/UV) for the degradation and color removal of a 25 mg L–1 mixture of three acid dyes: Blue 9, Red 18, and Yellow 23. A low speed rotating disc reactor (20 rpm) and a H2O2 concentration of 2.5 mmol L–1 were used. The dyes did not significantly undergo photolysis, although they were all d...

Three technologies were tested (TiO2/UV, H2O2/UV, and TiO2/H2O2/UV) for the degradation and color removal of a 25 mg L–1 mixture of three acid dyes: Blue 9, Red 18, and Yellow 23. A low speed rotating disc reactor (20 rpm) and a H2O2 concentration of 2.5 mmol L–1 were used. The dyes did not significantly undergo photolysis, although they were all d...

The photocatalytic activity of bulk and supported TiO2 catalysts were tested using formic acid as a probe molecule. The supported catalysts tested were prepared by impregnation using aluminum oxide (Al2O3) as the support and the bulk catalysts by precipitation, both in sol-gel systems. For purposes of comparison, a photocatalyst supplied by DEGUSSA...

The heterogeneous photocatalytic process has been studied in the last decades for liquid and gaseous effluents treatment. This process starts through activation of semiconductor metal oxides (usually TiO2, in anatase form) by ultraviolet radiation generating species capable of degrading (partially or totally) organic compounds. It is also used as a...