DIMINUAREA CONCENTRAŢIEI AMESTECULUI DE COLORANŢI ŞI SURFACTANŢI ÎN SOLUŢIILE MODEL LA OXIDAREA LOR CATALITICĂ ŞI FOTOCATALITICĂ CU PEROXIDUL DE HIDROGEN
Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
CEP USM
Abstract
A fost studiat procesul diminuării concentraţiei amestecului de coloranţi (direcţi şi activi) şi de surfactanţi din solu-
ţiile model la oxidarea lor catalitică şi fotocatalitică cu peroxidul de hidrogen în funcţie de concentraţia coloranţilor,
natura surfactanţilor şi timpul de iradiere cu razele UV. În rezultatul cercetărilor s-a constatat că cel mai eficient se
oxidează fotocatalitic cu peroxidul de hidrogen amestecul de decoloranţi direcţi (RAD şi AAD) şi activi (RA şi PA) şi
surfactantul amfoter, iar concentraţia remanentă a compuşilor degradaţi se încardează în limitele admisibile. S-a stabilit că,
la oxidarea fotocatalitică a amestecului de coloranţi direcţi şi activi şi de surfactanţi anionici, cationici şi neionogeni,
moleculele de surfactanţi degradează mai greu decât moleculele de colorant, iar concentraţia remanentă a substanţelor
organice poate fi micşorată numai prin adsorbţie pe cărbune activ.
There has been studied the decreasing process of the concentration of the mixture of (direct and reactive) dyes and surfactants from the model solutions by applying catalytic and photo -catalytic oxidation with hydrogen peroxide depending on dyes concentration, the nature of surfactants and UV irradiation tim e. As a result of the research, it was established that the mixture of direct dyes (RAD and AAD), reactive dyes (Red Active and Orange Active) and amphoteric surfactant oxidizes most effective, and the remaining concentration of the degraded compounds borders within acceptable limits. It was also established that after the photocatalytic oxidation treatment of the mixture of direct and active dyes and anionic, cationic and nonionic surfactants, the molecules of the surfactants degrade heavier than the molecules of the dyes and the remaining concentration of the organic substances can be reduced only by adsorption on activated carbon.
There has been studied the decreasing process of the concentration of the mixture of (direct and reactive) dyes and surfactants from the model solutions by applying catalytic and photo -catalytic oxidation with hydrogen peroxide depending on dyes concentration, the nature of surfactants and UV irradiation tim e. As a result of the research, it was established that the mixture of direct dyes (RAD and AAD), reactive dyes (Red Active and Orange Active) and amphoteric surfactant oxidizes most effective, and the remaining concentration of the degraded compounds borders within acceptable limits. It was also established that after the photocatalytic oxidation treatment of the mixture of direct and active dyes and anionic, cationic and nonionic surfactants, the molecules of the surfactants degrade heavier than the molecules of the dyes and the remaining concentration of the organic substances can be reduced only by adsorption on activated carbon.
Description
Keywords
coloranţi activi și direcţi, substanţe tensioactive, peroxid de hidrogen, oxidare avansată, catalytic and photocatalytic oxidation, direct and active dyes
Citation
MATVEEVICI, Vera; GONŢA, Maria, MOCANU, Larisa et al. Diminuarea concentraţiei amestecului coloranţi şi surfactanţei în soluţiile model la oxidarea lor catalitică şi fotocatalitică cu peroxidul de hidrogen. In: Studia Universitatis Moldaviae. Seria Ştiinţe reale şi ale naturii. Biologie. Chimie. Revistă ştiinţifică. 2013, nr. 1(61), pp. 143-153