Academic literature on the topic 'Disperse Blue 79'

Azo dyes are the major group of synthetic dyes known and have given rise to many water and soil environmental problems, the most of this azo dyes were used in textile industry. The aim of this study is the removal of Disperse Blue 79 (DB 79) and Disperse Blue 165 (DB 165) as azo dyes by Hydroxyapatite (HAP). The adsorption experiments were carried out to investigate the factors that influence the dyes uptake by hydroxyapatite, such as the contact time under agitation, adsorbent dosage, initial dye concentration and size of HAP. To reduce the number of experiments, full factorial experimental design at two levels (24) was used to achieve optimal conditions for the removal of DB 79 and DB 165 from aqueous solutions.

The mineralization of the azo dye Disperse Blue 79 (DB79) was studied under sequenced anaerobic/aerobic environments. This paper presents the results of the first stage of the process, i.e., the anaerobic decolouration of the azo dye. A sequencing batch biofilter was used. The results showed that DB79 was only biotransformed to amines, resulting in a decolorization of the effluent. The anaerobic bacteria, without using co-substrate, achieved the decolouration when the concentration of DB79 was lower than 48 mg/l. It was necessary to use a co-substrate to reach decolouration efficiencies higher than 95%, when the concentration of DB79 in the influent was superior to 48 mg/l. In 72 h more than 95% of the initial colourant was biotransformed.

The current study aimed to investigate the elimination of dyes from sewerage, using microfiltration membrane mechanism. Three dyes were applied, acid yellow-23, disperse blue -79 and acid orange -7. Experiments were performed with feed concentration (40 -120) ppm, feed flow rate (25 -65) l/h and time (0.25 -1.5) h. The membrane used ceramic membrane, constructed as a candle. It was discovered that water flow diminishes with an elevation in running time, feeding oil concentration and enhancing with elevation in the feed flow rate. In addition, it was determined that the elimination (rejection) rate of dyes enhances with elevation in the flow rate, and the elimination (rejection) rate diminishes as time passes. In cross flow microfiltration, the rejection concentration (concentrate) goes up as time passes, with high feed concentration and flow rate. It was also discovered that the modal infusion concentration declines with high feed concentration and working time. In addition, it was found that product rate goes down as time passes and with high feed concentration. Increasing feed concentration of dyes was associated with an increase in the concentration of rejecting solution. The highest elimination of disperse blue -79, Acid Yellow- 23 and acid orange -7, are 97%, 96.4% and 95.8%, respectively. The maximum recovery percentage of disperse blue - 79, acid yellow- 23 and acid orange -7are 57.7%, 58.5% and 59% respectively.

Azo dyes are generally used in food, cosmetic, textile, pharmaceutical, and leather industries. Many of these dyes are carcinogens and need a treatment. The aim of the present study was to use chitosan (CHT), phosphogypsum (PG) and natural phosphate (NP) powders for the removal of Disperse Blue 79 (DB 79) from aqueous solution. The effects of contact time, initial dye concentration, absorbents doses, solution pH, and temperature on the batch adsorption process were systematically studied. Isotherm models were applied to the experimental equilibrium data and pseudo-first order, pseudo-second order kinetic models were used to describe the kinetic data and to evaluate the rate constants. The thermodynamic parameters, such as the changes in enthalpy, entropy, and Gibbs free energy were also studied. The results show that the chitosan, phosphogypsum and natural phosphate could be used for the removal of DB 79 in wastewater treatment.