Photocatalytic degradation of Vat Green 03 textile dye, using the ferrihydrite-modified diatomite with TiO2 /UV process

Abstract

This work is a study of the photodegradation( photocatalytic degradation ) of a dye of the textile industry. The Vat Green 03 textile dye of a chemical structure is C31H15NO3 as a function of pH, Titanium dioxide concentration and dye concentration in the study with dyestuff were led by lamp UV of trans-illuminator using the titanium dioxide TiO2 ( Degussa P25) like catalyst with a co-adsorbent, which is a rock formed primarily by the accumulation of frustules of diatoms called « diatomite or Kieselguhrs» in the layer of Sig having the advantage of being locally available and less expensive . The diatomite, which will be modified by iron « the deposit of ferrihydrite on raw diatomite by FeCl2.4 H2O » and NaOH to increase the specific surface area of this material. Comparison of the results from x-ray diffraction ( XRD) show that the raw diatomite has an irregular structure at the modification by ferrihydrite to obtain the principal phases of ferric oxide in kind are,in rule of crystallinity, ferrihydrite,maghemite, akaganeite, magnetite,hematite, goethite ,and Schwertmannite increasing . The prepared material of diatomite and ferrihydrite applied for the photodegradation of Vat Green 03 textile dye used a concentration 20 mg/L with different of pH, and different concentrations from materials, added with 0,02 g titanium dioxide ( TiO2 ) under lamp UV with an agitation.The results of the photocatalytics tests applied from material DMF1 which there was a better colour remove about 97% at pH=4.The objective of this work it is the elimination of the organic pollutants of industrial wastewater.