Factors and mass ratio analyses for Reactive Blue 19 dye decolorization using ozone: an experimental and analytical modelling approach

Abstract

Dyes highly reduce sunlight penetration into the stream, and consequently affect photosynthesis and oxygen transfer into water bodies. An experimental and analytical modelling approach to Reactive Blue 19 (RB19) removal using ozone was carried out. For this purpose, factors and mass ratio analyses were assessed based on batch assays experiments. Removal efficiency increased from 64 to 94% when the dosage increased from 38.4 to 153.6 mg O3.L-1. Results showed that RB19 is more efficiently removed when initial pH is 7. The rate of RB19 removal decreased as the initial dye concentration increased. Kinetic studies showed that the ozonation of RB19 was a pseudo first-order reaction with respect to the dye, and the apparent rate constant declined logarithmically with the initial dye concentration. Mass ratio studies showed that, for the empirical analysis, the power law equation was adequate to describe mass ratio over time and the analytical analysis suggests that the process is influenced by mass transfer in the liquid film as well as in the bulk fluid.

Avaliação da concentração de radionuclídeos de origem natural (NORM) e elementos de terras raras presentes na lama vermelha, proveniente dos estados do Pará e de São Paulo, Brasil

“…(2013) mostra que as concentrações de terras raras, podem chegar até 1700 ppm, dependendo da fonte mineral da bauxita, sendo um valor quase centena de vezes maior que a concentração média de ETR na crosta terrestre, cerca de 22 ppm. (CETEM, 2015) É crescente nas últimas décadas, os estudos e possibilidades de aproveitamento do resíduo lama vermelha, podendo-se destacar o seu uso como: meio para a remoção e tratamento de água e gases (CONCEIÇÃO et al, 2021;BOTELHO JUNIOR et al, 2020;SILVA et al, 2019;PICHINELLI et al, 2017;LOPES et al, 2017;MORENO et al, 2016), produção de revestimentos cerâmicos em liga de alumínio (SOTTOVIA et al, 2014), materiais de construção com tijolo, cimento e concreto (MOREIRA et al, 2020;DERELI & TOSUN, 2020;CHENG et al, 2019;ALEKSEEV et al, 2019;YATHISH et al, 2020;GORONOVSKI et al, 2018GORONOVSKI et al, , 2019GORONOVSKI et al, , 2021OZDEN et al, 2019;HEGEDUS et al, 2019;GU et al, 2017), matériaprima para o desenvolvimento de cerâmica (SUN et. al., 2021;Xu et.…”