The degradation process of Acid Orange 52 dye in aqueous solutions by electrocatalytic technique has been studied. Acid Orange 52 was chosen as a representative compound of azo dyes and one of the often used acid dyes in the textile industry. In the electrocatalytic reactor, the titanium plates with catalyst layer were used as anode, and the stainless steel plates worked as cathodes. The layers of catalyst were coated on titanium plates by electrochemical method followed by calcination. The effect of dye initial concentration (Cdye), catalyst nature on anode, initial voltage (Uin), electrolysis time (t), initial solution pHin and NaCl concentration on the rate of Acid Orange 52 degradation process was studied in the electrocatalytic process. It was determined that the optimal conditions of electrocatalytic treatment, in particular are: Cdye=100 mg/l, Uin=20 V, pHin = 6, t = 50 min. The experimental results show that when Acid Orange 52 simulated dye wastewater was treated under the optimal conditions, the treatment effect was 95 % in visible part of light spectrum (464 nm) and 38.6 % in ultraviolet part (270nm), respectively. The removal rate of chemical oxygen demand (COD) and total organic carbon (TOC) were 23.5 % and 47.7 %, respectively. It was found that electrocatalytic process can provide an effective decolorization rate of Acid Orange 52. However, not high values of COD removal rate most likely witness that there was no significant destruction of large fragments of the dye structure, such as the benzene ring.Forcitation:Hui Zhao, Heng Zhong, Lei Sun, Dongsheng Xia, Nevsky A.V. Acid Orange 52 dye degradation efficiency by electrocatalytic method. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 3. P. 64-69
The degradation efficiency of Acid Orange 52 dye in an aqueous solutions using the combination of electrocatalytic and photocatalytic processes has been studied. Electrocatalytic and photocatalytic methods in practice reckon among advanced oxidation processes (AOPs). The effect of catalyst B dosage and irradiarion time on the rate of mentioned dye degradation was studied in the photocatalytic process. It was shown, that when Acid Orange 52 simulated dye wastewater was treated by electrocatalytic technique under optimal conditions with catalyst A, the decolorization treatment effect was 95 % in visible part of light spectrum (464 nm) and 38.6 % in ultraviolet part (270 nm), respectively. When the combined electrocatalytic-photocatalytic technique was processed with catalysts A and B, the color removal rate of dye could reach 99.3% (464 nm) and 91.5% (270 nm), respectively. The large amount of products of small mole weight was formed in the course of oxidation reaction. Moreover, the obtained values of chemical oxygen demand (COD) and total organic carbon (TOC) witnessed, that the combination of electrocatalytic and photocatalytic processes could significantly improve the biodegradability of dye as a whole.It was shown, that the removal rate of COD and TOC, respectively, were 54.3% and 72.8%. The reaction intermediates were determined by electrospray ionization-mass spectrometry (ESI-MS) analysis, and as a result, the probable degradation mechanism (pathway) has been proposed. The results of the work may be useful as theoretical bases for designing effective resource-saving, technically efficient and economically sound wastewater treatment systems, containing hardly biodegradable azo dyes.Forcitation:Zhao H., Zhong H., Sun L., Xia D., Nevsky A.V. Acid Orange 52 dye degradation by electrocatalytic plus photocatalytic technique and intermediates detection. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 4-5. P. 111-118
Introduction: the conceptual regulations of the theory of sustainable socio-economic development provide the creation of resource-saving environmental friendly production, the basis of which are the effectively operating resource-saving water-use chemical processes (WUCP) of industrial plants. So, the objective of this investigation was the development of the designing methodology for scientific-reasonable resource-saving chemical processes of water management system for textile enterprises, which use the basic dyeing-finishing technology of cloth. Methods and materials: the thermodynamic exergy and thermodynamic water pinch methods of synthesis of resource-saving WUCP of industrial plants have been used and refined upon by us. The efficiency of proposed wastewater purification techniqueselectrocatalytic destruction, photocatalytic destruction, catalytic destruction by hydrogen peroxide, coagulation, clarification filtration, magnetic treatment was studied on model and real effluents. The metal oxides were used as catalysts. The special eperimental technique for development of technology of heavy metals ions utilization as useful products, such as mineral pigments, has been proposed. Results: a seven-steps scheme was investigated for project design: 1) the source data gathering: environmental-oriented analysis (inventory) of industrial enterprise's technology; 2) the design of integrated resource-saving water management system of industrial enterprise; 3) the design of repeatedly-serial water integrated chemical process system of industrial enterprise's shops (process lines); 4) the development of wastewater purification techniques; 5) the development of intelligence (computer) system of resource-saving water management system of industrial enterprise; 6) the technological risk assessment and safety management system; 7) the estimation of ecologic and economic efficiency of the project. Conclusion: the methodology of designing of resource-saving WUCP of textile enterprises has been developed. The functional diagram of resource-saving WUCP of dyeing-finishing production of textile plant has been proposed. The structure of intelligence system application and software of resource-saving WUCP designing and operation has been developed. Wastewater purification techniques have been investigated. The electrocatalytic plus photocatalytic destruction and coagulation methods are proved to be most perspective in practice of sewage treatment. The basic technical-economic parameters of the project were estimated.Keywords: methodology of designing water management systems, water-use technological processes, thermodynamic exergy method, thermodynamic water pinch method, wastewater purification techniques, electrocatalytic metod, technological risk, ecologic-economic effectiveness. АннотацияВведение: концептуальные положения теории устойчивого социально-экономического развития предусматривают создание ресурсосберегающего экологически безопасного производства, основой которого служат эффективно действующие ресурсосберегающие водо...
This research deals with the investigation of adsorption characteristics of different types of composite coagulants-flocculants, combined by polyaluminum chloride (aluminum oxychloride) with organic polymer. The effect of this composite coagulants-flocculants on solution's turbidity removal and characteristics of cohesion and coagulation process have been studied too. On the basis of experimental data obtained the character and mechanism of cohesion and coagulation for different types of composite coagulants-flocculants were discussed. It was stated out that the adsorption isotherm of cationic composite coagulants-flocculants conforms to Langmuir adsorption law, and it characterized by monolayer adsorption parameters, which increases their ability to neutralize electric charge. The anionic composite coagulants-flocculants enhance the adsorption value and bridging ability with the help of organic polymers, showing multilayer adsorption characteristics. It was observed specifically, that under the same conditions the flocculation rate and sedimentation rate of composite coagulants-flocculants are higher than polyaluminum chloride has. This fact was explained by the advantages of organic polymer due to its long chain which is able to form larger floc within short time. The large floc has strong attractive potential energy for tiny particles, which make the opportunity of effective collision between particles what leads to sharply increased coagulation. The influence of storage time period on composite coagulants-flocculants coagulation effectiveness has been examined. The experimental results witness that the coagulation characteristics of reagents will be reduced to some extent after long-term storage, but composite coagulants-flocculants have advantages in this aspect over polyaluminum chloride. It should be concluded that, in general, the quality of composite coagulants-flocculants in relation to their stability remained at a high level.
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